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Update zlib to 1.2.13

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This commit is contained in:
dmiller
2023-04-28 15:01:27 +00:00
parent 909b022bd7
commit 2d338aaf71
120 changed files with 11844 additions and 2141 deletions
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42
libz/CMakeLists.txt
View File

@@ -3,10 +3,7 @@ set(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS ON)
project(zlib C)
set(VERSION "1.2.12")
option(ASM686 "Enable building i686 assembly implementation")
option(AMD64 "Enable building amd64 assembly implementation")
set(VERSION "1.2.13")
set(INSTALL_BIN_DIR "${CMAKE_INSTALL_PREFIX}/bin" CACHE PATH "Installation directory for executables")
set(INSTALL_LIB_DIR "${CMAKE_INSTALL_PREFIX}/lib" CACHE PATH "Installation directory for libraries")
@@ -129,39 +126,6 @@ if(NOT MINGW)
)
endif()
if(CMAKE_COMPILER_IS_GNUCC)
if(ASM686)
set(ZLIB_ASMS contrib/asm686/match.S)
elseif (AMD64)
set(ZLIB_ASMS contrib/amd64/amd64-match.S)
endif ()
if(ZLIB_ASMS)
add_definitions(-DASMV)
set_source_files_properties(${ZLIB_ASMS} PROPERTIES LANGUAGE C COMPILE_FLAGS -DNO_UNDERLINE)
endif()
endif()
if(MSVC)
if(ASM686)
ENABLE_LANGUAGE(ASM_MASM)
set(ZLIB_ASMS
contrib/masmx86/inffas32.asm
contrib/masmx86/match686.asm
)
elseif (AMD64)
ENABLE_LANGUAGE(ASM_MASM)
set(ZLIB_ASMS
contrib/masmx64/gvmat64.asm
contrib/masmx64/inffasx64.asm
)
endif()
if(ZLIB_ASMS)
add_definitions(-DASMV -DASMINF)
endif()
endif()
# parse the full version number from zlib.h and include in ZLIB_FULL_VERSION
file(READ ${CMAKE_CURRENT_SOURCE_DIR}/zlib.h _zlib_h_contents)
string(REGEX REPLACE ".*#define[ \t]+ZLIB_VERSION[ \t]+\"([-0-9A-Za-z.]+)\".*"
@@ -183,8 +147,8 @@ if(MINGW)
set(ZLIB_DLL_SRCS ${CMAKE_CURRENT_BINARY_DIR}/zlib1rc.obj)
endif(MINGW)
add_library(zlib SHARED ${ZLIB_SRCS} ${ZLIB_ASMS} ${ZLIB_DLL_SRCS} ${ZLIB_PUBLIC_HDRS} ${ZLIB_PRIVATE_HDRS})
add_library(zlibstatic STATIC ${ZLIB_SRCS} ${ZLIB_ASMS} ${ZLIB_PUBLIC_HDRS} ${ZLIB_PRIVATE_HDRS})
add_library(zlib SHARED ${ZLIB_SRCS} ${ZLIB_DLL_SRCS} ${ZLIB_PUBLIC_HDRS} ${ZLIB_PRIVATE_HDRS})
add_library(zlibstatic STATIC ${ZLIB_SRCS} ${ZLIB_PUBLIC_HDRS} ${ZLIB_PRIVATE_HDRS})
set_target_properties(zlib PROPERTIES DEFINE_SYMBOL ZLIB_DLL)
set_target_properties(zlib PROPERTIES SOVERSION 1)

24
libz/ChangeLog
View File

@@ -1,6 +1,18 @@
ChangeLog file for zlib
Changes in 1.2.13 (13 Oct 2022)
- Fix configure issue that discarded provided CC definition
- Correct incorrect inputs provided to the CRC functions
- Repair prototypes and exporting of new CRC functions
- Fix inflateBack to detect invalid input with distances too far
- Have infback() deliver all of the available output up to any error
- Fix a bug when getting a gzip header extra field with inflate()
- Fix bug in block type selection when Z_FIXED used
- Tighten deflateBound bounds
- Remove deleted assembler code references
- Various portability and appearance improvements
Changes in 1.2.12 (27 Mar 2022)
- Cygwin does not have _wopen(), so do not create gzopen_w() there
- Permit a deflateParams() parameter change as soon as possible
@@ -159,7 +171,7 @@ Changes in 1.2.7.1 (24 Mar 2013)
- Fix types in contrib/minizip to match result of get_crc_table()
- Simplify contrib/vstudio/vc10 with 'd' suffix
- Add TOP support to win32/Makefile.msc
- Suport i686 and amd64 assembler builds in CMakeLists.txt
- Support i686 and amd64 assembler builds in CMakeLists.txt
- Fix typos in the use of _LARGEFILE64_SOURCE in zconf.h
- Add vc11 and vc12 build files to contrib/vstudio
- Add gzvprintf() as an undocumented function in zlib
@@ -359,14 +371,14 @@ Changes in 1.2.5.1 (10 Sep 2011)
- Use u4 type for crc_table to avoid conversion warnings
- Apply casts in zlib.h to avoid conversion warnings
- Add OF to prototypes for adler32_combine_ and crc32_combine_ [Miller]
- Improve inflateSync() documentation to note indeterminancy
- Improve inflateSync() documentation to note indeterminacy
- Add deflatePending() function to return the amount of pending output
- Correct the spelling of "specification" in FAQ [Randers-Pehrson]
- Add a check in configure for stdarg.h, use for gzprintf()
- Check that pointers fit in ints when gzprint() compiled old style
- Add dummy name before $(SHAREDLIBV) in Makefile [Bar-Lev, Bowler]
- Delete line in configure that adds -L. libz.a to LDFLAGS [Weigelt]
- Add debug records in assmebler code [Londer]
- Add debug records in assembler code [Londer]
- Update RFC references to use http://tools.ietf.org/html/... [Li]
- Add --archs option, use of libtool to configure for Mac OS X [Borstel]
@@ -1033,7 +1045,7 @@ Changes in 1.2.0.1 (17 March 2003)
- Include additional header file on VMS for off_t typedef
- Try to use _vsnprintf where it supplants vsprintf [Vollant]
- Add some casts in inffast.c
- Enchance comments in zlib.h on what happens if gzprintf() tries to
- Enhance comments in zlib.h on what happens if gzprintf() tries to
write more than 4095 bytes before compression
- Remove unused state from inflateBackEnd()
- Remove exit(0) from minigzip.c, example.c
@@ -1211,7 +1223,7 @@ Changes in 1.0.9 (17 Feb 1998)
- Avoid gcc 2.8.0 comparison bug a little differently than zlib 1.0.8
- in inftrees.c, avoid cc -O bug on HP (Farshid Elahi)
- in zconf.h move the ZLIB_DLL stuff earlier to avoid problems with
the declaration of FAR (Gilles VOllant)
the declaration of FAR (Gilles Vollant)
- install libz.so* with mode 755 (executable) instead of 644 (Marc Lehmann)
- read_buf buf parameter of type Bytef* instead of charf*
- zmemcpy parameters are of type Bytef*, not charf* (Joseph Strout)
@@ -1567,7 +1579,7 @@ Changes in 0.4:
- renamed deflateOptions as deflateInit2, call one or the other but not both
- added the method parameter for deflateInit2
- added inflateInit2
- simplied considerably deflateInit and inflateInit by not supporting
- simplified considerably deflateInit and inflateInit by not supporting
user-provided history buffer. This is supported only in deflateInit2
and inflateInit2

22
libz/LICENSE Normal file
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@@ -0,0 +1,22 @@
Copyright notice:
(C) 1995-2022 Jean-loup Gailly and Mark Adler
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
Jean-loup Gailly Mark Adler
jloup@gzip.org madler@alumni.caltech.edu

20
libz/Makefile.in
View File

@@ -7,10 +7,6 @@
# Normally configure builds both a static and a shared library.
# If you want to build just a static library, use: ./configure --static
# To use the asm code, type:
# cp contrib/asm?86/match.S ./match.S
# make LOC=-DASMV OBJA=match.o
# To install /usr/local/lib/libz.* and /usr/local/include/zlib.h, type:
# make install
# To install in $HOME instead of /usr/local, use:
@@ -26,13 +22,13 @@ CFLAGS=-O
SFLAGS=-O
LDFLAGS=
TEST_LDFLAGS=-L. libz.a
TEST_LDFLAGS=$(LDFLAGS) -L. libz.a
LDSHARED=$(CC)
CPP=$(CC) -E
STATICLIB=libz.a
SHAREDLIB=libz.so
SHAREDLIBV=libz.so.1.2.12
SHAREDLIBV=libz.so.1.2.13
SHAREDLIBM=libz.so.1
LIBS=$(STATICLIB) $(SHAREDLIBV)
@@ -87,7 +83,7 @@ test: all teststatic testshared
teststatic: static
@TMPST=tmpst_$$; \
if echo hello world | ./minigzip | ./minigzip -d && ./example $$TMPST ; then \
if echo hello world | ${QEMU_RUN} ./minigzip | ${QEMU_RUN} ./minigzip -d && ${QEMU_RUN} ./example $$TMPST ; then \
echo ' *** zlib test OK ***'; \
else \
echo ' *** zlib test FAILED ***'; false; \
@@ -100,7 +96,7 @@ testshared: shared
DYLD_LIBRARY_PATH=`pwd`:$(DYLD_LIBRARY_PATH) ; export DYLD_LIBRARY_PATH; \
SHLIB_PATH=`pwd`:$(SHLIB_PATH) ; export SHLIB_PATH; \
TMPSH=tmpsh_$$; \
if echo hello world | ./minigzipsh | ./minigzipsh -d && ./examplesh $$TMPSH; then \
if echo hello world | ${QEMU_RUN} ./minigzipsh | ${QEMU_RUN} ./minigzipsh -d && ${QEMU_RUN} ./examplesh $$TMPSH; then \
echo ' *** zlib shared test OK ***'; \
else \
echo ' *** zlib shared test FAILED ***'; false; \
@@ -109,7 +105,7 @@ testshared: shared
test64: all64
@TMP64=tmp64_$$; \
if echo hello world | ./minigzip64 | ./minigzip64 -d && ./example64 $$TMP64; then \
if echo hello world | ${QEMU_RUN} ./minigzip64 | ${QEMU_RUN} ./minigzip64 -d && ${QEMU_RUN} ./example64 $$TMP64; then \
echo ' *** zlib 64-bit test OK ***'; \
else \
echo ' *** zlib 64-bit test FAILED ***'; false; \
@@ -124,7 +120,7 @@ infcover: infcover.o libz.a
cover: infcover
rm -f *.gcda
./infcover
${QEMU_RUN} ./infcover
gcov inf*.c
libz.a: $(OBJS)
@@ -292,10 +288,10 @@ minigzip$(EXE): minigzip.o $(STATICLIB)
$(CC) $(CFLAGS) -o $@ minigzip.o $(TEST_LDFLAGS)
examplesh$(EXE): example.o $(SHAREDLIBV)
$(CC) $(CFLAGS) -o $@ example.o -L. $(SHAREDLIBV)
$(CC) $(CFLAGS) -o $@ example.o $(LDFLAGS) -L. $(SHAREDLIBV)
minigzipsh$(EXE): minigzip.o $(SHAREDLIBV)
$(CC) $(CFLAGS) -o $@ minigzip.o -L. $(SHAREDLIBV)
$(CC) $(CFLAGS) -o $@ minigzip.o $(LDFLAGS) -L. $(SHAREDLIBV)
example64$(EXE): example64.o $(STATICLIB)
$(CC) $(CFLAGS) -o $@ example64.o $(TEST_LDFLAGS)

4
libz/README
View File

@@ -1,6 +1,6 @@
ZLIB DATA COMPRESSION LIBRARY
zlib 1.2.12 is a general purpose data compression library. All the code is
zlib 1.2.13 is a general purpose data compression library. All the code is
thread safe. The data format used by the zlib library is described by RFCs
(Request for Comments) 1950 to 1952 in the files
http://tools.ietf.org/html/rfc1950 (zlib format), rfc1951 (deflate format) and
@@ -31,7 +31,7 @@ Mark Nelson <markn@ieee.org> wrote an article about zlib for the Jan. 1997
issue of Dr. Dobb's Journal; a copy of the article is available at
http://marknelson.us/1997/01/01/zlib-engine/ .
The changes made in version 1.2.12 are documented in the file ChangeLog.
The changes made in version 1.2.13 are documented in the file ChangeLog.
Unsupported third party contributions are provided in directory contrib/ .

6
libz/compress.c
View File

@@ -19,7 +19,7 @@
memory, Z_BUF_ERROR if there was not enough room in the output buffer,
Z_STREAM_ERROR if the level parameter is invalid.
*/
int ZEXPORT compress2 (dest, destLen, source, sourceLen, level)
int ZEXPORT compress2(dest, destLen, source, sourceLen, level)
Bytef *dest;
uLongf *destLen;
const Bytef *source;
@@ -65,7 +65,7 @@ int ZEXPORT compress2 (dest, destLen, source, sourceLen, level)
/* ===========================================================================
*/
int ZEXPORT compress (dest, destLen, source, sourceLen)
int ZEXPORT compress(dest, destLen, source, sourceLen)
Bytef *dest;
uLongf *destLen;
const Bytef *source;
@@ -78,7 +78,7 @@ int ZEXPORT compress (dest, destLen, source, sourceLen)
If the default memLevel or windowBits for deflateInit() is changed, then
this function needs to be updated.
*/
uLong ZEXPORT compressBound (sourceLen)
uLong ZEXPORT compressBound(sourceLen)
uLong sourceLen;
{
return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) +

100
libz/configure vendored
View File

@@ -32,8 +32,11 @@ fi
# set command prefix for cross-compilation
if [ -n "${CHOST}" ]; then
uname="`echo "${CHOST}" | sed -e 's/^[^-]*-\([^-]*\)$/\1/' -e 's/^[^-]*-[^-]*-\([^-]*\)$/\1/' -e 's/^[^-]*-[^-]*-\([^-]*\)-.*$/\1/'`"
uname=${CHOST}
mname=${CHOST}
CROSS_PREFIX="${CHOST}-"
else
mname=`(uname -a || echo unknown) 2>/dev/null`
fi
# destination name for static library
@@ -142,8 +145,7 @@ case "$1" in
*)
echo "unknown option: $1" | tee -a configure.log
echo "$0 --help for help" | tee -a configure.log
# leave 1;; # Hack for nmap compilation
shift;;
leave 1;;
esac
done
@@ -175,9 +177,10 @@ if test -z "$CC"; then
else
cc=${CROSS_PREFIX}cc
fi
else
cc=${CC}
fi
cflags=${CFLAGS-"-O3"}
# to force the asm version use: CFLAGS="-O3 -DASMV" ./configure
case "$cc" in
*gcc*) gcc=1 ;;
*clang*) gcc=1 ;;
@@ -203,13 +206,13 @@ if test "$gcc" -eq 1 && ($cc -c $test.c) >> configure.log 2>&1; then
fi
if test "$warn" -eq 1; then
if test "$zconst" -eq 1; then
CFLAGS="${CFLAGS} -Wall -Wextra -Wcast-qual -pedantic -DZLIB_CONST"
CFLAGS="${CFLAGS} -Wall -Wextra -Wcast-qual -DZLIB_CONST"
else
CFLAGS="${CFLAGS} -Wall -Wextra -pedantic"
CFLAGS="${CFLAGS} -Wall -Wextra"
fi
fi
if test $sanitize -eq 1; then
CFLAGS="${CFLAGS} -fsanitize=address"
CFLAGS="${CFLAGS} -g -fsanitize=address"
fi
if test $debug -eq 1; then
CFLAGS="${CFLAGS} -DZLIB_DEBUG"
@@ -219,47 +222,52 @@ if test "$gcc" -eq 1 && ($cc -c $test.c) >> configure.log 2>&1; then
uname=`(uname -s || echo unknown) 2>/dev/null`
fi
case "$uname" in
Linux* | linux* | GNU | GNU/* | solaris*)
Linux* | linux* | *-linux* | GNU | GNU/* | solaris*)
case "$mname" in
*sparc*)
LDFLAGS="${LDFLAGS} -Wl,--no-warn-rwx-segments" ;;
esac
LDSHARED=${LDSHARED-"$cc -shared -Wl,-soname,libz.so.1,--version-script,${SRCDIR}zlib.map"} ;;
*BSD | *bsd* | DragonFly)
LDSHARED=${LDSHARED-"$cc -shared -Wl,-soname,libz.so.1,--version-script,${SRCDIR}zlib.map"}
LDCONFIG="ldconfig -m" ;;
CYGWIN* | Cygwin* | cygwin* | OS/2*)
CYGWIN* | Cygwin* | cygwin* | *-cygwin* | OS/2*)
EXE='.exe' ;;
MINGW* | mingw*)
# temporary bypass
MINGW* | mingw* | *-mingw*)
rm -f $test.[co] $test $test$shared_ext
echo "Please use win32/Makefile.gcc instead." | tee -a configure.log
leave 1
echo "If this doesn't work for you, try win32/Makefile.gcc." | tee -a configure.log
LDSHARED=${LDSHARED-"$cc -shared"}
LDSHAREDLIBC=""
EXE='.exe' ;;
QNX*) # This is for QNX6. I suppose that the QNX rule below is for QNX2,QNX4
# (alain.bonnefoy@icbt.com)
LDSHARED=${LDSHARED-"$cc -shared -Wl,-hlibz.so.1"} ;;
QNX*) # This is for QNX6. I suppose that the QNX rule below is for QNX2,QNX4
# (alain.bonnefoy@icbt.com)
LDSHARED=${LDSHARED-"$cc -shared -Wl,-hlibz.so.1"} ;;
HP-UX*)
LDSHARED=${LDSHARED-"$cc -shared $SFLAGS"}
case `(uname -m || echo unknown) 2>/dev/null` in
ia64)
shared_ext='.so'
SHAREDLIB='libz.so' ;;
*)
shared_ext='.sl'
SHAREDLIB='libz.sl' ;;
esac ;;
Darwin* | darwin*)
shared_ext='.dylib'
SHAREDLIB=libz$shared_ext
SHAREDLIBV=libz.$VER$shared_ext
SHAREDLIBM=libz.$VER1$shared_ext
LDSHARED=${LDSHARED-"$cc -dynamiclib -install_name $libdir/$SHAREDLIBM -compatibility_version $VER1 -current_version $VER3"}
if libtool -V 2>&1 | grep Apple > /dev/null; then
AR="libtool"
else
AR="/usr/bin/libtool"
fi
ARFLAGS="-o" ;;
*) LDSHARED=${LDSHARED-"$cc -shared"} ;;
LDSHARED=${LDSHARED-"$cc -shared $SFLAGS"}
case `(uname -m || echo unknown) 2>/dev/null` in
ia64)
shared_ext='.so'
SHAREDLIB='libz.so' ;;
*)
shared_ext='.sl'
SHAREDLIB='libz.sl' ;;
esac ;;
AIX*)
LDFLAGS="${LDFLAGS} -Wl,-brtl" ;;
Darwin* | darwin* | *-darwin*)
shared_ext='.dylib'
SHAREDLIB=libz$shared_ext
SHAREDLIBV=libz.$VER$shared_ext
SHAREDLIBM=libz.$VER1$shared_ext
LDSHARED=${LDSHARED-"$cc -dynamiclib -install_name $libdir/$SHAREDLIBM -compatibility_version $VER1 -current_version $VER3"}
if libtool -V 2>&1 | grep Apple > /dev/null; then
AR="libtool"
else
AR="/usr/bin/libtool"
fi
ARFLAGS="-o" ;;
*)
LDSHARED=${LDSHARED-"$cc -shared"} ;;
esac
else
# find system name and corresponding cc options
@@ -451,20 +459,6 @@ else
TEST="all teststatic testshared"
fi
# check for underscores in external names for use by assembler code
CPP=${CPP-"$CC -E"}
case $CFLAGS in
*ASMV*)
echo >> configure.log
show "$NM $test.o | grep _hello"
if test "`$NM $test.o | grep _hello | tee -a configure.log`" = ""; then
CPP="$CPP -DNO_UNDERLINE"
echo Checking for underline in external names... No. | tee -a configure.log
else
echo Checking for underline in external names... Yes. | tee -a configure.log
fi ;;
esac
echo >> configure.log
# check for size_t

2
libz/contrib/README.contrib
View File

@@ -1,4 +1,4 @@
All files under this contrib directory are UNSUPPORTED. There were
All files under this contrib directory are UNSUPPORTED. They were
provided by users of zlib and were not tested by the authors of zlib.
Use at your own risk. Please contact the authors of the contributions
for help about these, not the zlib authors. Thanks.

BIN
libz/contrib/blast/test.pk Normal file
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2
libz/contrib/delphi/ZLib.pas
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@@ -152,7 +152,7 @@ procedure DecompressToUserBuf(const InBuf: Pointer; InBytes: Integer;
const OutBuf: Pointer; BufSize: Integer);
const
zlib_version = '1.2.12';
zlib_version = '1.2.13';
type
EZlibError = class(Exception);

33
libz/contrib/dotzlib/DotZLib.build Normal file
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@@ -0,0 +1,33 @@
<?xml version="1.0" encoding="utf-8" ?>
<project name="DotZLib" default="build" basedir="./DotZLib">
<description>A .Net wrapper library around ZLib1.dll</description>
<property name="nunit.location" value="c:/program files/NUnit V2.1/bin" />
<property name="build.root" value="bin" />
<property name="debug" value="true" />
<property name="nunit" value="true" />
<property name="build.folder" value="${build.root}/debug/" if="${debug}" />
<property name="build.folder" value="${build.root}/release/" unless="${debug}" />
<target name="clean" description="Remove all generated files">
<delete dir="${build.root}" failonerror="false" />
</target>
<target name="build" description="compiles the source code">
<mkdir dir="${build.folder}" />
<csc target="library" output="${build.folder}DotZLib.dll" debug="${debug}">
<references basedir="${nunit.location}">
<includes if="${nunit}" name="nunit.framework.dll" />
</references>
<sources>
<includes name="*.cs" />
<excludes name="UnitTests.cs" unless="${nunit}" />
</sources>
<arg value="/d:nunit" if="${nunit}" />
</csc>
</target>
</project>

BIN
libz/contrib/dotzlib/DotZLib.chm Normal file
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21
libz/contrib/dotzlib/DotZLib.sln Normal file
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@@ -0,0 +1,21 @@
Microsoft Visual Studio Solution File, Format Version 8.00
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DotZLib", "DotZLib\DotZLib.csproj", "{BB1EE0B1-1808-46CB-B786-949D91117FC5}"
ProjectSection(ProjectDependencies) = postProject
EndProjectSection
EndProject
Global
GlobalSection(SolutionConfiguration) = preSolution
Debug = Debug
Release = Release
EndGlobalSection
GlobalSection(ProjectConfiguration) = postSolution
{BB1EE0B1-1808-46CB-B786-949D91117FC5}.Debug.ActiveCfg = Debug|.NET
{BB1EE0B1-1808-46CB-B786-949D91117FC5}.Debug.Build.0 = Debug|.NET
{BB1EE0B1-1808-46CB-B786-949D91117FC5}.Release.ActiveCfg = Release|.NET
{BB1EE0B1-1808-46CB-B786-949D91117FC5}.Release.Build.0 = Release|.NET
EndGlobalSection
GlobalSection(ExtensibilityGlobals) = postSolution
EndGlobalSection
GlobalSection(ExtensibilityAddIns) = postSolution
EndGlobalSection
EndGlobal

58
libz/contrib/dotzlib/DotZLib/AssemblyInfo.cs Normal file
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@@ -0,0 +1,58 @@
using System.Reflection;
using System.Runtime.CompilerServices;
//
// General Information about an assembly is controlled through the following
// set of attributes. Change these attribute values to modify the information
// associated with an assembly.
//
[assembly: AssemblyTitle("DotZLib")]
[assembly: AssemblyDescription(".Net bindings for ZLib compression dll 1.2.x")]
[assembly: AssemblyConfiguration("")]
[assembly: AssemblyCompany("Henrik Ravn")]
[assembly: AssemblyProduct("")]
[assembly: AssemblyCopyright("(c) 2004 by Henrik Ravn")]
[assembly: AssemblyTrademark("")]
[assembly: AssemblyCulture("")]
//
// Version information for an assembly consists of the following four values:
//
// Major Version
// Minor Version
// Build Number
// Revision
//
// You can specify all the values or you can default the Revision and Build Numbers
// by using the '*' as shown below:
[assembly: AssemblyVersion("1.0.*")]
//
// In order to sign your assembly you must specify a key to use. Refer to the
// Microsoft .NET Framework documentation for more information on assembly signing.
//
// Use the attributes below to control which key is used for signing.
//
// Notes:
// (*) If no key is specified, the assembly is not signed.
// (*) KeyName refers to a key that has been installed in the Crypto Service
// Provider (CSP) on your machine. KeyFile refers to a file which contains
// a key.
// (*) If the KeyFile and the KeyName values are both specified, the
// following processing occurs:
// (1) If the KeyName can be found in the CSP, that key is used.
// (2) If the KeyName does not exist and the KeyFile does exist, the key
// in the KeyFile is installed into the CSP and used.
// (*) In order to create a KeyFile, you can use the sn.exe (Strong Name) utility.
// When specifying the KeyFile, the location of the KeyFile should be
// relative to the project output directory which is
// %Project Directory%\obj\<configuration>. For example, if your KeyFile is
// located in the project directory, you would specify the AssemblyKeyFile
// attribute as [assembly: AssemblyKeyFile("..\\..\\mykey.snk")]
// (*) Delay Signing is an advanced option - see the Microsoft .NET Framework
// documentation for more information on this.
//
[assembly: AssemblyDelaySign(false)]
[assembly: AssemblyKeyFile("")]
[assembly: AssemblyKeyName("")]

202
libz/contrib/dotzlib/DotZLib/ChecksumImpl.cs Normal file
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@@ -0,0 +1,202 @@
//
// <20> Copyright Henrik Ravn 2004
//
// Use, modification and distribution are subject to the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
using System;
using System.Runtime.InteropServices;
using System.Text;
namespace DotZLib
{
#region ChecksumGeneratorBase
/// <summary>
/// Implements the common functionality needed for all <see cref="ChecksumGenerator"/>s
/// </summary>
/// <example></example>
public abstract class ChecksumGeneratorBase : ChecksumGenerator
{
/// <summary>
/// The value of the current checksum
/// </summary>
protected uint _current;
/// <summary>
/// Initializes a new instance of the checksum generator base - the current checksum is
/// set to zero
/// </summary>
public ChecksumGeneratorBase()
{
_current = 0;
}
/// <summary>
/// Initializes a new instance of the checksum generator basewith a specified value
/// </summary>
/// <param name="initialValue">The value to set the current checksum to</param>
public ChecksumGeneratorBase(uint initialValue)
{
_current = initialValue;
}
/// <summary>
/// Resets the current checksum to zero
/// </summary>
public void Reset() { _current = 0; }
/// <summary>
/// Gets the current checksum value
/// </summary>
public uint Value { get { return _current; } }
/// <summary>
/// Updates the current checksum with part of an array of bytes
/// </summary>
/// <param name="data">The data to update the checksum with</param>
/// <param name="offset">Where in <c>data</c> to start updating</param>
/// <param name="count">The number of bytes from <c>data</c> to use</param>
/// <exception cref="ArgumentException">The sum of offset and count is larger than the length of <c>data</c></exception>
/// <exception cref="NullReferenceException"><c>data</c> is a null reference</exception>
/// <exception cref="ArgumentOutOfRangeException">Offset or count is negative.</exception>
/// <remarks>All the other <c>Update</c> methods are implmeneted in terms of this one.
/// This is therefore the only method a derived class has to implement</remarks>
public abstract void Update(byte[] data, int offset, int count);
/// <summary>
/// Updates the current checksum with an array of bytes.
/// </summary>
/// <param name="data">The data to update the checksum with</param>
public void Update(byte[] data)
{
Update(data, 0, data.Length);
}
/// <summary>
/// Updates the current checksum with the data from a string
/// </summary>
/// <param name="data">The string to update the checksum with</param>
/// <remarks>The characters in the string are converted by the UTF-8 encoding</remarks>
public void Update(string data)
{
Update(Encoding.UTF8.GetBytes(data));
}
/// <summary>
/// Updates the current checksum with the data from a string, using a specific encoding
/// </summary>
/// <param name="data">The string to update the checksum with</param>
/// <param name="encoding">The encoding to use</param>
public void Update(string data, Encoding encoding)
{
Update(encoding.GetBytes(data));
}
}
#endregion
#region CRC32
/// <summary>
/// Implements a CRC32 checksum generator
/// </summary>
public sealed class CRC32Checksum : ChecksumGeneratorBase
{
#region DLL imports
[DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
private static extern uint crc32(uint crc, int data, uint length);
#endregion
/// <summary>
/// Initializes a new instance of the CRC32 checksum generator
/// </summary>
public CRC32Checksum() : base() {}
/// <summary>
/// Initializes a new instance of the CRC32 checksum generator with a specified value
/// </summary>
/// <param name="initialValue">The value to set the current checksum to</param>
public CRC32Checksum(uint initialValue) : base(initialValue) {}
/// <summary>
/// Updates the current checksum with part of an array of bytes
/// </summary>
/// <param name="data">The data to update the checksum with</param>
/// <param name="offset">Where in <c>data</c> to start updating</param>
/// <param name="count">The number of bytes from <c>data</c> to use</param>
/// <exception cref="ArgumentException">The sum of offset and count is larger than the length of <c>data</c></exception>
/// <exception cref="NullReferenceException"><c>data</c> is a null reference</exception>
/// <exception cref="ArgumentOutOfRangeException">Offset or count is negative.</exception>
public override void Update(byte[] data, int offset, int count)
{
if (offset < 0 || count < 0) throw new ArgumentOutOfRangeException();
if ((offset+count) > data.Length) throw new ArgumentException();
GCHandle hData = GCHandle.Alloc(data, GCHandleType.Pinned);
try
{
_current = crc32(_current, hData.AddrOfPinnedObject().ToInt32()+offset, (uint)count);
}
finally
{
hData.Free();
}
}
}
#endregion
#region Adler
/// <summary>
/// Implements a checksum generator that computes the Adler checksum on data
/// </summary>
public sealed class AdlerChecksum : ChecksumGeneratorBase
{
#region DLL imports
[DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
private static extern uint adler32(uint adler, int data, uint length);
#endregion
/// <summary>
/// Initializes a new instance of the Adler checksum generator
/// </summary>
public AdlerChecksum() : base() {}
/// <summary>
/// Initializes a new instance of the Adler checksum generator with a specified value
/// </summary>
/// <param name="initialValue">The value to set the current checksum to</param>
public AdlerChecksum(uint initialValue) : base(initialValue) {}
/// <summary>
/// Updates the current checksum with part of an array of bytes
/// </summary>
/// <param name="data">The data to update the checksum with</param>
/// <param name="offset">Where in <c>data</c> to start updating</param>
/// <param name="count">The number of bytes from <c>data</c> to use</param>
/// <exception cref="ArgumentException">The sum of offset and count is larger than the length of <c>data</c></exception>
/// <exception cref="NullReferenceException"><c>data</c> is a null reference</exception>
/// <exception cref="ArgumentOutOfRangeException">Offset or count is negative.</exception>
public override void Update(byte[] data, int offset, int count)
{
if (offset < 0 || count < 0) throw new ArgumentOutOfRangeException();
if ((offset+count) > data.Length) throw new ArgumentException();
GCHandle hData = GCHandle.Alloc(data, GCHandleType.Pinned);
try
{
_current = adler32(_current, hData.AddrOfPinnedObject().ToInt32()+offset, (uint)count);
}
finally
{
hData.Free();
}
}
}
#endregion
}

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//
// <20> Copyright Henrik Ravn 2004
//
// Use, modification and distribution are subject to the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
using System;
using System.Diagnostics;
namespace DotZLib
{
/// <summary>
/// This class implements a circular buffer
/// </summary>
internal class CircularBuffer
{
#region Private data
private int _capacity;
private int _head;
private int _tail;
private int _size;
private byte[] _buffer;
#endregion
public CircularBuffer(int capacity)
{
Debug.Assert( capacity > 0 );
_buffer = new byte[capacity];
_capacity = capacity;
_head = 0;
_tail = 0;
_size = 0;
}
public int Size { get { return _size; } }
public int Put(byte[] source, int offset, int count)
{
Debug.Assert( count > 0 );
int trueCount = Math.Min(count, _capacity - Size);
for (int i = 0; i < trueCount; ++i)
_buffer[(_tail+i) % _capacity] = source[offset+i];
_tail += trueCount;
_tail %= _capacity;
_size += trueCount;
return trueCount;
}
public bool Put(byte b)
{
if (Size == _capacity) // no room
return false;
_buffer[_tail++] = b;
_tail %= _capacity;
++_size;
return true;
}
public int Get(byte[] destination, int offset, int count)
{
int trueCount = Math.Min(count,Size);
for (int i = 0; i < trueCount; ++i)
destination[offset + i] = _buffer[(_head+i) % _capacity];
_head += trueCount;
_head %= _capacity;
_size -= trueCount;
return trueCount;
}
public int Get()
{
if (Size == 0)
return -1;
int result = (int)_buffer[_head++ % _capacity];
--_size;
return result;
}
}
}

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libz/contrib/dotzlib/DotZLib/CodecBase.cs Normal file
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//
// <20> Copyright Henrik Ravn 2004
//
// Use, modification and distribution are subject to the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
using System;
using System.Runtime.InteropServices;
namespace DotZLib
{
/// <summary>
/// Implements the common functionality needed for all <see cref="Codec"/>s
/// </summary>
public abstract class CodecBase : Codec, IDisposable
{
#region Data members
/// <summary>
/// Instance of the internal zlib buffer structure that is
/// passed to all functions in the zlib dll
/// </summary>
internal ZStream _ztream = new ZStream();
/// <summary>
/// True if the object instance has been disposed, false otherwise
/// </summary>
protected bool _isDisposed = false;
/// <summary>
/// The size of the internal buffers
/// </summary>
protected const int kBufferSize = 16384;
private byte[] _outBuffer = new byte[kBufferSize];
private byte[] _inBuffer = new byte[kBufferSize];
private GCHandle _hInput;
private GCHandle _hOutput;
private uint _checksum = 0;
#endregion
/// <summary>
/// Initializes a new instance of the <c>CodeBase</c> class.
/// </summary>
public CodecBase()
{
try
{
_hInput = GCHandle.Alloc(_inBuffer, GCHandleType.Pinned);
_hOutput = GCHandle.Alloc(_outBuffer, GCHandleType.Pinned);
}
catch (Exception)
{
CleanUp(false);
throw;
}
}
#region Codec Members
/// <summary>
/// Occurs when more processed data are available.
/// </summary>
public event DataAvailableHandler DataAvailable;
/// <summary>
/// Fires the <see cref="DataAvailable"/> event
/// </summary>
protected void OnDataAvailable()
{
if (_ztream.total_out > 0)
{
if (DataAvailable != null)
DataAvailable( _outBuffer, 0, (int)_ztream.total_out);
resetOutput();
}
}
/// <summary>
/// Adds more data to the codec to be processed.
/// </summary>
/// <param name="data">Byte array containing the data to be added to the codec</param>
/// <remarks>Adding data may, or may not, raise the <c>DataAvailable</c> event</remarks>
public void Add(byte[] data)
{
Add(data,0,data.Length);
}
/// <summary>
/// Adds more data to the codec to be processed.
/// </summary>
/// <param name="data">Byte array containing the data to be added to the codec</param>
/// <param name="offset">The index of the first byte to add from <c>data</c></param>
/// <param name="count">The number of bytes to add</param>
/// <remarks>Adding data may, or may not, raise the <c>DataAvailable</c> event</remarks>
/// <remarks>This must be implemented by a derived class</remarks>
public abstract void Add(byte[] data, int offset, int count);
/// <summary>
/// Finishes up any pending data that needs to be processed and handled.
/// </summary>
/// <remarks>This must be implemented by a derived class</remarks>
public abstract void Finish();
/// <summary>
/// Gets the checksum of the data that has been added so far
/// </summary>
public uint Checksum { get { return _checksum; } }
#endregion
#region Destructor & IDisposable stuff
/// <summary>
/// Destroys this instance
/// </summary>
~CodecBase()
{
CleanUp(false);
}
/// <summary>
/// Releases any unmanaged resources and calls the <see cref="CleanUp()"/> method of the derived class
/// </summary>
public void Dispose()
{
CleanUp(true);
}
/// <summary>
/// Performs any codec specific cleanup
/// </summary>
/// <remarks>This must be implemented by a derived class</remarks>
protected abstract void CleanUp();
// performs the release of the handles and calls the dereived CleanUp()
private void CleanUp(bool isDisposing)
{
if (!_isDisposed)
{
CleanUp();
if (_hInput.IsAllocated)
_hInput.Free();
if (_hOutput.IsAllocated)
_hOutput.Free();
_isDisposed = true;
}
}
#endregion
#region Helper methods
/// <summary>
/// Copies a number of bytes to the internal codec buffer - ready for proccesing
/// </summary>
/// <param name="data">The byte array that contains the data to copy</param>
/// <param name="startIndex">The index of the first byte to copy</param>
/// <param name="count">The number of bytes to copy from <c>data</c></param>
protected void copyInput(byte[] data, int startIndex, int count)
{
Array.Copy(data, startIndex, _inBuffer,0, count);
_ztream.next_in = _hInput.AddrOfPinnedObject();
_ztream.total_in = 0;
_ztream.avail_in = (uint)count;
}
/// <summary>
/// Resets the internal output buffers to a known state - ready for processing
/// </summary>
protected void resetOutput()
{
_ztream.total_out = 0;
_ztream.avail_out = kBufferSize;
_ztream.next_out = _hOutput.AddrOfPinnedObject();
}
/// <summary>
/// Updates the running checksum property
/// </summary>
/// <param name="newSum">The new checksum value</param>
protected void setChecksum(uint newSum)
{
_checksum = newSum;
}
#endregion
}
}

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//
// <20> Copyright Henrik Ravn 2004
//
// Use, modification and distribution are subject to the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
namespace DotZLib
{
/// <summary>
/// Implements a data compressor, using the deflate algorithm in the ZLib dll
/// </summary>
public sealed class Deflater : CodecBase
{
#region Dll imports
[DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl, CharSet=CharSet.Ansi)]
private static extern int deflateInit_(ref ZStream sz, int level, string vs, int size);
[DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
private static extern int deflate(ref ZStream sz, int flush);
[DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
private static extern int deflateReset(ref ZStream sz);
[DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
private static extern int deflateEnd(ref ZStream sz);
#endregion
/// <summary>
/// Constructs an new instance of the <c>Deflater</c>
/// </summary>
/// <param name="level">The compression level to use for this <c>Deflater</c></param>
public Deflater(CompressLevel level) : base()
{
int retval = deflateInit_(ref _ztream, (int)level, Info.Version, Marshal.SizeOf(_ztream));
if (retval != 0)
throw new ZLibException(retval, "Could not initialize deflater");
resetOutput();
}
/// <summary>
/// Adds more data to the codec to be processed.
/// </summary>
/// <param name="data">Byte array containing the data to be added to the codec</param>
/// <param name="offset">The index of the first byte to add from <c>data</c></param>
/// <param name="count">The number of bytes to add</param>
/// <remarks>Adding data may, or may not, raise the <c>DataAvailable</c> event</remarks>
public override void Add(byte[] data, int offset, int count)
{
if (data == null) throw new ArgumentNullException();
if (offset < 0 || count < 0) throw new ArgumentOutOfRangeException();
if ((offset+count) > data.Length) throw new ArgumentException();
int total = count;
int inputIndex = offset;
int err = 0;
while (err >= 0 && inputIndex < total)
{
copyInput(data, inputIndex, Math.Min(total - inputIndex, kBufferSize));
while (err >= 0 && _ztream.avail_in > 0)
{
err = deflate(ref _ztream, (int)FlushTypes.None);
if (err == 0)
while (_ztream.avail_out == 0)
{
OnDataAvailable();
err = deflate(ref _ztream, (int)FlushTypes.None);
}
inputIndex += (int)_ztream.total_in;
}
}
setChecksum( _ztream.adler );
}
/// <summary>
/// Finishes up any pending data that needs to be processed and handled.
/// </summary>
public override void Finish()
{
int err;
do
{
err = deflate(ref _ztream, (int)FlushTypes.Finish);
OnDataAvailable();
}
while (err == 0);
setChecksum( _ztream.adler );
deflateReset(ref _ztream);
resetOutput();
}
/// <summary>
/// Closes the internal zlib deflate stream
/// </summary>
protected override void CleanUp() { deflateEnd(ref _ztream); }
}
}

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//
// <20> Copyright Henrik Ravn 2004
//
// Use, modification and distribution are subject to the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;
namespace DotZLib
{
#region Internal types
/// <summary>
/// Defines constants for the various flush types used with zlib
/// </summary>
internal enum FlushTypes
{
None, Partial, Sync, Full, Finish, Block
}
#region ZStream structure
// internal mapping of the zlib zstream structure for marshalling
[StructLayoutAttribute(LayoutKind.Sequential, Pack=4, Size=0, CharSet=CharSet.Ansi)]
internal struct ZStream
{
public IntPtr next_in;
public uint avail_in;
public uint total_in;
public IntPtr next_out;
public uint avail_out;
public uint total_out;
[MarshalAs(UnmanagedType.LPStr)]
string msg;
uint state;
uint zalloc;
uint zfree;
uint opaque;
int data_type;
public uint adler;
uint reserved;
}
#endregion
#endregion
#region Public enums
/// <summary>
/// Defines constants for the available compression levels in zlib
/// </summary>
public enum CompressLevel : int
{
/// <summary>
/// The default compression level with a reasonable compromise between compression and speed
/// </summary>
Default = -1,
/// <summary>
/// No compression at all. The data are passed straight through.
/// </summary>
None = 0,
/// <summary>
/// The maximum compression rate available.
/// </summary>
Best = 9,
/// <summary>
/// The fastest available compression level.
/// </summary>
Fastest = 1
}
#endregion
#region Exception classes
/// <summary>
/// The exception that is thrown when an error occurs on the zlib dll
/// </summary>
public class ZLibException : ApplicationException
{
/// <summary>
/// Initializes a new instance of the <see cref="ZLibException"/> class with a specified
/// error message and error code
/// </summary>
/// <param name="errorCode">The zlib error code that caused the exception</param>
/// <param name="msg">A message that (hopefully) describes the error</param>
public ZLibException(int errorCode, string msg) : base(String.Format("ZLib error {0} {1}", errorCode, msg))
{
}
/// <summary>
/// Initializes a new instance of the <see cref="ZLibException"/> class with a specified
/// error code
/// </summary>
/// <param name="errorCode">The zlib error code that caused the exception</param>
public ZLibException(int errorCode) : base(String.Format("ZLib error {0}", errorCode))
{
}
}
#endregion
#region Interfaces
/// <summary>
/// Declares methods and properties that enables a running checksum to be calculated
/// </summary>
public interface ChecksumGenerator
{
/// <summary>
/// Gets the current value of the checksum
/// </summary>
uint Value { get; }
/// <summary>
/// Clears the current checksum to 0
/// </summary>
void Reset();
/// <summary>
/// Updates the current checksum with an array of bytes
/// </summary>
/// <param name="data">The data to update the checksum with</param>
void Update(byte[] data);
/// <summary>
/// Updates the current checksum with part of an array of bytes
/// </summary>
/// <param name="data">The data to update the checksum with</param>
/// <param name="offset">Where in <c>data</c> to start updating</param>
/// <param name="count">The number of bytes from <c>data</c> to use</param>
/// <exception cref="ArgumentException">The sum of offset and count is larger than the length of <c>data</c></exception>
/// <exception cref="ArgumentNullException"><c>data</c> is a null reference</exception>
/// <exception cref="ArgumentOutOfRangeException">Offset or count is negative.</exception>
void Update(byte[] data, int offset, int count);
/// <summary>
/// Updates the current checksum with the data from a string
/// </summary>
/// <param name="data">The string to update the checksum with</param>
/// <remarks>The characters in the string are converted by the UTF-8 encoding</remarks>
void Update(string data);
/// <summary>
/// Updates the current checksum with the data from a string, using a specific encoding
/// </summary>
/// <param name="data">The string to update the checksum with</param>
/// <param name="encoding">The encoding to use</param>
void Update(string data, Encoding encoding);
}
/// <summary>
/// Represents the method that will be called from a codec when new data
/// are available.
/// </summary>
/// <paramref name="data">The byte array containing the processed data</paramref>
/// <paramref name="startIndex">The index of the first processed byte in <c>data</c></paramref>
/// <paramref name="count">The number of processed bytes available</paramref>
/// <remarks>On return from this method, the data may be overwritten, so grab it while you can.
/// You cannot assume that startIndex will be zero.
/// </remarks>
public delegate void DataAvailableHandler(byte[] data, int startIndex, int count);
/// <summary>
/// Declares methods and events for implementing compressors/decompressors
/// </summary>
public interface Codec
{
/// <summary>
/// Occurs when more processed data are available.
/// </summary>
event DataAvailableHandler DataAvailable;
/// <summary>
/// Adds more data to the codec to be processed.
/// </summary>
/// <param name="data">Byte array containing the data to be added to the codec</param>
/// <remarks>Adding data may, or may not, raise the <c>DataAvailable</c> event</remarks>
void Add(byte[] data);
/// <summary>
/// Adds more data to the codec to be processed.
/// </summary>
/// <param name="data">Byte array containing the data to be added to the codec</param>
/// <param name="offset">The index of the first byte to add from <c>data</c></param>
/// <param name="count">The number of bytes to add</param>
/// <remarks>Adding data may, or may not, raise the <c>DataAvailable</c> event</remarks>
void Add(byte[] data, int offset, int count);
/// <summary>
/// Finishes up any pending data that needs to be processed and handled.
/// </summary>
void Finish();
/// <summary>
/// Gets the checksum of the data that has been added so far
/// </summary>
uint Checksum { get; }
}
#endregion
#region Classes
/// <summary>
/// Encapsulates general information about the ZLib library
/// </summary>
public class Info
{
#region DLL imports
[DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
private static extern uint zlibCompileFlags();
[DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
private static extern string zlibVersion();
#endregion
#region Private stuff
private uint _flags;
// helper function that unpacks a bitsize mask
private static int bitSize(uint bits)
{
switch (bits)
{
case 0: return 16;
case 1: return 32;
case 2: return 64;
}
return -1;
}
#endregion
/// <summary>
/// Constructs an instance of the <c>Info</c> class.
/// </summary>
public Info()
{
_flags = zlibCompileFlags();
}
/// <summary>
/// True if the library is compiled with debug info
/// </summary>
public bool HasDebugInfo { get { return 0 != (_flags & 0x100); } }
/// <summary>
/// True if the library is compiled with assembly optimizations
/// </summary>
public bool UsesAssemblyCode { get { return 0 != (_flags & 0x200); } }
/// <summary>
/// Gets the size of the unsigned int that was compiled into Zlib
/// </summary>
public int SizeOfUInt { get { return bitSize(_flags & 3); } }
/// <summary>
/// Gets the size of the unsigned long that was compiled into Zlib
/// </summary>
public int SizeOfULong { get { return bitSize((_flags >> 2) & 3); } }
/// <summary>
/// Gets the size of the pointers that were compiled into Zlib
/// </summary>
public int SizeOfPointer { get { return bitSize((_flags >> 4) & 3); } }
/// <summary>
/// Gets the size of the z_off_t type that was compiled into Zlib
/// </summary>
public int SizeOfOffset { get { return bitSize((_flags >> 6) & 3); } }
/// <summary>
/// Gets the version of ZLib as a string, e.g. "1.2.1"
/// </summary>
public static string Version { get { return zlibVersion(); } }
}
#endregion
}

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<VisualStudioProject>
<CSHARP
ProjectType = "Local"
ProductVersion = "7.10.3077"
SchemaVersion = "2.0"
ProjectGuid = "{BB1EE0B1-1808-46CB-B786-949D91117FC5}"
>
<Build>
<Settings
ApplicationIcon = ""
AssemblyKeyContainerName = ""
AssemblyName = "DotZLib"
AssemblyOriginatorKeyFile = ""
DefaultClientScript = "JScript"
DefaultHTMLPageLayout = "Grid"
DefaultTargetSchema = "IE50"
DelaySign = "false"
OutputType = "Library"
PreBuildEvent = ""
PostBuildEvent = ""
RootNamespace = "DotZLib"
RunPostBuildEvent = "OnBuildSuccess"
StartupObject = ""
>
<Config
Name = "Debug"
AllowUnsafeBlocks = "false"
BaseAddress = "285212672"
CheckForOverflowUnderflow = "false"
ConfigurationOverrideFile = ""
DefineConstants = "DEBUG;TRACE"
DocumentationFile = "docs\DotZLib.xml"
DebugSymbols = "true"
FileAlignment = "4096"
IncrementalBuild = "false"
NoStdLib = "false"
NoWarn = "1591"
Optimize = "false"
OutputPath = "bin\Debug\"
RegisterForComInterop = "false"
RemoveIntegerChecks = "false"
TreatWarningsAsErrors = "false"
WarningLevel = "4"
/>
<Config
Name = "Release"
AllowUnsafeBlocks = "false"
BaseAddress = "285212672"
CheckForOverflowUnderflow = "false"
ConfigurationOverrideFile = ""
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DocumentationFile = "docs\DotZLib.xml"
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IncrementalBuild = "false"
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OutputPath = "bin\Release\"
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TreatWarningsAsErrors = "false"
WarningLevel = "4"
/>
</Settings>
<References>
<Reference
Name = "System"
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AssemblyName = "nunit.framework"
HintPath = "E:\apps\NUnit V2.1\\bin\nunit.framework.dll"
AssemblyFolderKey = "hklm\dn\nunit.framework"
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</References>
</Build>
<Files>
<Include>
<File
RelPath = "AssemblyInfo.cs"
SubType = "Code"
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</CSHARP>
</VisualStudioProject>

301
libz/contrib/dotzlib/DotZLib/GZipStream.cs Normal file
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//
// <20> Copyright Henrik Ravn 2004
//
// Use, modification and distribution are subject to the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
using System;
using System.IO;
using System.Runtime.InteropServices;
namespace DotZLib
{
/// <summary>
/// Implements a compressed <see cref="Stream"/>, in GZip (.gz) format.
/// </summary>
public class GZipStream : Stream, IDisposable
{
#region Dll Imports
[DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl, CharSet=CharSet.Ansi)]
private static extern IntPtr gzopen(string name, string mode);
[DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
private static extern int gzclose(IntPtr gzFile);
[DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
private static extern int gzwrite(IntPtr gzFile, int data, int length);
[DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
private static extern int gzread(IntPtr gzFile, int data, int length);
[DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
private static extern int gzgetc(IntPtr gzFile);
[DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
private static extern int gzputc(IntPtr gzFile, int c);
#endregion
#region Private data
private IntPtr _gzFile;
private bool _isDisposed = false;
private bool _isWriting;
#endregion
#region Constructors
/// <summary>
/// Creates a new file as a writeable GZipStream
/// </summary>
/// <param name="fileName">The name of the compressed file to create</param>
/// <param name="level">The compression level to use when adding data</param>
/// <exception cref="ZLibException">If an error occurred in the internal zlib function</exception>
public GZipStream(string fileName, CompressLevel level)
{
_isWriting = true;
_gzFile = gzopen(fileName, String.Format("wb{0}", (int)level));
if (_gzFile == IntPtr.Zero)
throw new ZLibException(-1, "Could not open " + fileName);
}
/// <summary>
/// Opens an existing file as a readable GZipStream
/// </summary>
/// <param name="fileName">The name of the file to open</param>
/// <exception cref="ZLibException">If an error occurred in the internal zlib function</exception>
public GZipStream(string fileName)
{
_isWriting = false;
_gzFile = gzopen(fileName, "rb");
if (_gzFile == IntPtr.Zero)
throw new ZLibException(-1, "Could not open " + fileName);
}
#endregion
#region Access properties
/// <summary>
/// Returns true of this stream can be read from, false otherwise
/// </summary>
public override bool CanRead
{
get
{
return !_isWriting;
}
}
/// <summary>
/// Returns false.
/// </summary>
public override bool CanSeek
{
get
{
return false;
}
}
/// <summary>
/// Returns true if this tsream is writeable, false otherwise
/// </summary>
public override bool CanWrite
{
get
{
return _isWriting;
}
}
#endregion
#region Destructor & IDispose stuff
/// <summary>
/// Destroys this instance
/// </summary>
~GZipStream()
{
cleanUp(false);
}
/// <summary>
/// Closes the external file handle
/// </summary>
public void Dispose()
{
cleanUp(true);
}
// Does the actual closing of the file handle.
private void cleanUp(bool isDisposing)
{
if (!_isDisposed)
{
gzclose(_gzFile);
_isDisposed = true;
}
}
#endregion
#region Basic reading and writing
/// <summary>
/// Attempts to read a number of bytes from the stream.
/// </summary>
/// <param name="buffer">The destination data buffer</param>
/// <param name="offset">The index of the first destination byte in <c>buffer</c></param>
/// <param name="count">The number of bytes requested</param>
/// <returns>The number of bytes read</returns>
/// <exception cref="ArgumentNullException">If <c>buffer</c> is null</exception>
/// <exception cref="ArgumentOutOfRangeException">If <c>count</c> or <c>offset</c> are negative</exception>
/// <exception cref="ArgumentException">If <c>offset</c> + <c>count</c> is &gt; buffer.Length</exception>
/// <exception cref="NotSupportedException">If this stream is not readable.</exception>
/// <exception cref="ObjectDisposedException">If this stream has been disposed.</exception>
public override int Read(byte[] buffer, int offset, int count)
{
if (!CanRead) throw new NotSupportedException();
if (buffer == null) throw new ArgumentNullException();
if (offset < 0 || count < 0) throw new ArgumentOutOfRangeException();
if ((offset+count) > buffer.Length) throw new ArgumentException();
if (_isDisposed) throw new ObjectDisposedException("GZipStream");
GCHandle h = GCHandle.Alloc(buffer, GCHandleType.Pinned);
int result;
try
{
result = gzread(_gzFile, h.AddrOfPinnedObject().ToInt32() + offset, count);
if (result < 0)
throw new IOException();
}
finally
{
h.Free();
}
return result;
}
/// <summary>
/// Attempts to read a single byte from the stream.
/// </summary>
/// <returns>The byte that was read, or -1 in case of error or End-Of-File</returns>
public override int ReadByte()
{
if (!CanRead) throw new NotSupportedException();
if (_isDisposed) throw new ObjectDisposedException("GZipStream");
return gzgetc(_gzFile);
}
/// <summary>
/// Writes a number of bytes to the stream
/// </summary>
/// <param name="buffer"></param>
/// <param name="offset"></param>
/// <param name="count"></param>
/// <exception cref="ArgumentNullException">If <c>buffer</c> is null</exception>
/// <exception cref="ArgumentOutOfRangeException">If <c>count</c> or <c>offset</c> are negative</exception>
/// <exception cref="ArgumentException">If <c>offset</c> + <c>count</c> is &gt; buffer.Length</exception>
/// <exception cref="NotSupportedException">If this stream is not writeable.</exception>
/// <exception cref="ObjectDisposedException">If this stream has been disposed.</exception>
public override void Write(byte[] buffer, int offset, int count)
{
if (!CanWrite) throw new NotSupportedException();
if (buffer == null) throw new ArgumentNullException();
if (offset < 0 || count < 0) throw new ArgumentOutOfRangeException();
if ((offset+count) > buffer.Length) throw new ArgumentException();
if (_isDisposed) throw new ObjectDisposedException("GZipStream");
GCHandle h = GCHandle.Alloc(buffer, GCHandleType.Pinned);
try
{
int result = gzwrite(_gzFile, h.AddrOfPinnedObject().ToInt32() + offset, count);
if (result < 0)
throw new IOException();
}
finally
{
h.Free();
}
}
/// <summary>
/// Writes a single byte to the stream
/// </summary>
/// <param name="value">The byte to add to the stream.</param>
/// <exception cref="NotSupportedException">If this stream is not writeable.</exception>
/// <exception cref="ObjectDisposedException">If this stream has been disposed.</exception>
public override void WriteByte(byte value)
{
if (!CanWrite) throw new NotSupportedException();
if (_isDisposed) throw new ObjectDisposedException("GZipStream");
int result = gzputc(_gzFile, (int)value);
if (result < 0)
throw new IOException();
}
#endregion
#region Position & length stuff
/// <summary>
/// Not supported.
/// </summary>
/// <param name="value"></param>
/// <exception cref="NotSupportedException">Always thrown</exception>
public override void SetLength(long value)
{
throw new NotSupportedException();
}
/// <summary>
/// Not suppported.
/// </summary>
/// <param name="offset"></param>
/// <param name="origin"></param>
/// <returns></returns>
/// <exception cref="NotSupportedException">Always thrown</exception>
public override long Seek(long offset, SeekOrigin origin)
{
throw new NotSupportedException();
}
/// <summary>
/// Flushes the <c>GZipStream</c>.
/// </summary>
/// <remarks>In this implementation, this method does nothing. This is because excessive
/// flushing may degrade the achievable compression rates.</remarks>
public override void Flush()
{
// left empty on purpose
}
/// <summary>
/// Gets/sets the current position in the <c>GZipStream</c>. Not suppported.
/// </summary>
/// <remarks>In this implementation this property is not supported</remarks>
/// <exception cref="NotSupportedException">Always thrown</exception>
public override long Position
{
get
{
throw new NotSupportedException();
}
set
{
throw new NotSupportedException();
}
}
/// <summary>
/// Gets the size of the stream. Not suppported.
/// </summary>
/// <remarks>In this implementation this property is not supported</remarks>
/// <exception cref="NotSupportedException">Always thrown</exception>
public override long Length
{
get
{
throw new NotSupportedException();
}
}
#endregion
}
}

105
libz/contrib/dotzlib/DotZLib/Inflater.cs Normal file
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@@ -0,0 +1,105 @@
//
// <20> Copyright Henrik Ravn 2004
//
// Use, modification and distribution are subject to the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
namespace DotZLib
{
/// <summary>
/// Implements a data decompressor, using the inflate algorithm in the ZLib dll
/// </summary>
public class Inflater : CodecBase
{
#region Dll imports
[DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl, CharSet=CharSet.Ansi)]
private static extern int inflateInit_(ref ZStream sz, string vs, int size);
[DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
private static extern int inflate(ref ZStream sz, int flush);
[DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
private static extern int inflateReset(ref ZStream sz);
[DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
private static extern int inflateEnd(ref ZStream sz);
#endregion
/// <summary>
/// Constructs an new instance of the <c>Inflater</c>
/// </summary>
public Inflater() : base()
{
int retval = inflateInit_(ref _ztream, Info.Version, Marshal.SizeOf(_ztream));
if (retval != 0)
throw new ZLibException(retval, "Could not initialize inflater");
resetOutput();
}
/// <summary>
/// Adds more data to the codec to be processed.
/// </summary>
/// <param name="data">Byte array containing the data to be added to the codec</param>
/// <param name="offset">The index of the first byte to add from <c>data</c></param>
/// <param name="count">The number of bytes to add</param>
/// <remarks>Adding data may, or may not, raise the <c>DataAvailable</c> event</remarks>
public override void Add(byte[] data, int offset, int count)
{
if (data == null) throw new ArgumentNullException();
if (offset < 0 || count < 0) throw new ArgumentOutOfRangeException();
if ((offset+count) > data.Length) throw new ArgumentException();
int total = count;
int inputIndex = offset;
int err = 0;
while (err >= 0 && inputIndex < total)
{
copyInput(data, inputIndex, Math.Min(total - inputIndex, kBufferSize));
err = inflate(ref _ztream, (int)FlushTypes.None);
if (err == 0)
while (_ztream.avail_out == 0)
{
OnDataAvailable();
err = inflate(ref _ztream, (int)FlushTypes.None);
}
inputIndex += (int)_ztream.total_in;
}
setChecksum( _ztream.adler );
}
/// <summary>
/// Finishes up any pending data that needs to be processed and handled.
/// </summary>
public override void Finish()
{
int err;
do
{
err = inflate(ref _ztream, (int)FlushTypes.Finish);
OnDataAvailable();
}
while (err == 0);
setChecksum( _ztream.adler );
inflateReset(ref _ztream);
resetOutput();
}
/// <summary>
/// Closes the internal zlib inflate stream
/// </summary>
protected override void CleanUp() { inflateEnd(ref _ztream); }
}
}

274
libz/contrib/dotzlib/DotZLib/UnitTests.cs Normal file
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@@ -0,0 +1,274 @@
//
// © Copyright Henrik Ravn 2004
//
// Use, modification and distribution are subject to the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
using System;
using System.Collections;
using System.IO;
// uncomment the define below to include unit tests
//#define nunit
#if nunit
using NUnit.Framework;
// Unit tests for the DotZLib class library
// ----------------------------------------
//
// Use this with NUnit 2 from http://www.nunit.org
//
namespace DotZLibTests
{
using DotZLib;
// helper methods
internal class Utils
{
public static bool byteArrEqual( byte[] lhs, byte[] rhs )
{
if (lhs.Length != rhs.Length)
return false;
for (int i = lhs.Length-1; i >= 0; --i)
if (lhs[i] != rhs[i])
return false;
return true;
}
}
[TestFixture]
public class CircBufferTests
{
#region Circular buffer tests
[Test]
public void SinglePutGet()
{
CircularBuffer buf = new CircularBuffer(10);
Assert.AreEqual( 0, buf.Size );
Assert.AreEqual( -1, buf.Get() );
Assert.IsTrue(buf.Put( 1 ));
Assert.AreEqual( 1, buf.Size );
Assert.AreEqual( 1, buf.Get() );
Assert.AreEqual( 0, buf.Size );
Assert.AreEqual( -1, buf.Get() );
}
[Test]
public void BlockPutGet()
{
CircularBuffer buf = new CircularBuffer(10);
byte[] arr = {1,2,3,4,5,6,7,8,9,10};
Assert.AreEqual( 10, buf.Put(arr,0,10) );
Assert.AreEqual( 10, buf.Size );
Assert.IsFalse( buf.Put(11) );
Assert.AreEqual( 1, buf.Get() );
Assert.IsTrue( buf.Put(11) );
byte[] arr2 = (byte[])arr.Clone();
Assert.AreEqual( 9, buf.Get(arr2,1,9) );
Assert.IsTrue( Utils.byteArrEqual(arr,arr2) );
}
#endregion
}
[TestFixture]
public class ChecksumTests
{
#region CRC32 Tests
[Test]
public void CRC32_Null()
{
CRC32Checksum crc32 = new CRC32Checksum();
Assert.AreEqual( 0, crc32.Value );
crc32 = new CRC32Checksum(1);
Assert.AreEqual( 1, crc32.Value );
crc32 = new CRC32Checksum(556);
Assert.AreEqual( 556, crc32.Value );
}
[Test]
public void CRC32_Data()
{
CRC32Checksum crc32 = new CRC32Checksum();
byte[] data = { 1,2,3,4,5,6,7 };
crc32.Update(data);
Assert.AreEqual( 0x70e46888, crc32.Value );
crc32 = new CRC32Checksum();
crc32.Update("penguin");
Assert.AreEqual( 0x0e5c1a120, crc32.Value );
crc32 = new CRC32Checksum(1);
crc32.Update("penguin");
Assert.AreEqual(0x43b6aa94, crc32.Value);
}
#endregion
#region Adler tests
[Test]
public void Adler_Null()
{
AdlerChecksum adler = new AdlerChecksum();
Assert.AreEqual(0, adler.Value);
adler = new AdlerChecksum(1);
Assert.AreEqual( 1, adler.Value );
adler = new AdlerChecksum(556);
Assert.AreEqual( 556, adler.Value );
}
[Test]
public void Adler_Data()
{
AdlerChecksum adler = new AdlerChecksum(1);
byte[] data = { 1,2,3,4,5,6,7 };
adler.Update(data);
Assert.AreEqual( 0x5b001d, adler.Value );
adler = new AdlerChecksum();
adler.Update("penguin");
Assert.AreEqual(0x0bcf02f6, adler.Value );
adler = new AdlerChecksum(1);
adler.Update("penguin");
Assert.AreEqual(0x0bd602f7, adler.Value);
}
#endregion
}
[TestFixture]
public class InfoTests
{
#region Info tests
[Test]
public void Info_Version()
{
Info info = new Info();
Assert.AreEqual("1.2.13", Info.Version);
Assert.AreEqual(32, info.SizeOfUInt);
Assert.AreEqual(32, info.SizeOfULong);
Assert.AreEqual(32, info.SizeOfPointer);
Assert.AreEqual(32, info.SizeOfOffset);
}
#endregion
}
[TestFixture]
public class DeflateInflateTests
{
#region Deflate tests
[Test]
public void Deflate_Init()
{
using (Deflater def = new Deflater(CompressLevel.Default))
{
}
}
private ArrayList compressedData = new ArrayList();
private uint adler1;
private ArrayList uncompressedData = new ArrayList();
private uint adler2;
public void CDataAvail(byte[] data, int startIndex, int count)
{
for (int i = 0; i < count; ++i)
compressedData.Add(data[i+startIndex]);
}
[Test]
public void Deflate_Compress()
{
compressedData.Clear();
byte[] testData = new byte[35000];
for (int i = 0; i < testData.Length; ++i)
testData[i] = 5;
using (Deflater def = new Deflater((CompressLevel)5))
{
def.DataAvailable += new DataAvailableHandler(CDataAvail);
def.Add(testData);
def.Finish();
adler1 = def.Checksum;
}
}
#endregion
#region Inflate tests
[Test]
public void Inflate_Init()
{
using (Inflater inf = new Inflater())
{
}
}
private void DDataAvail(byte[] data, int startIndex, int count)
{
for (int i = 0; i < count; ++i)
uncompressedData.Add(data[i+startIndex]);
}
[Test]
public void Inflate_Expand()
{
uncompressedData.Clear();
using (Inflater inf = new Inflater())
{
inf.DataAvailable += new DataAvailableHandler(DDataAvail);
inf.Add((byte[])compressedData.ToArray(typeof(byte)));
inf.Finish();
adler2 = inf.Checksum;
}
Assert.AreEqual( adler1, adler2 );
}
#endregion
}
[TestFixture]
public class GZipStreamTests
{
#region GZipStream test
[Test]
public void GZipStream_WriteRead()
{
using (GZipStream gzOut = new GZipStream("gzstream.gz", CompressLevel.Best))
{
BinaryWriter writer = new BinaryWriter(gzOut);
writer.Write("hi there");
writer.Write(Math.PI);
writer.Write(42);
}
using (GZipStream gzIn = new GZipStream("gzstream.gz"))
{
BinaryReader reader = new BinaryReader(gzIn);
string s = reader.ReadString();
Assert.AreEqual("hi there",s);
double d = reader.ReadDouble();
Assert.AreEqual(Math.PI, d);
int i = reader.ReadInt32();
Assert.AreEqual(42,i);
}
}
#endregion
}
}
#endif

23
libz/contrib/dotzlib/LICENSE_1_0.txt Normal file
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@@ -0,0 +1,23 @@
Boost Software License - Version 1.0 - August 17th, 2003
Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:
The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.

58
libz/contrib/dotzlib/readme.txt Normal file
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@@ -0,0 +1,58 @@
This directory contains a .Net wrapper class library for the ZLib1.dll
The wrapper includes support for inflating/deflating memory buffers,
.Net streaming wrappers for the gz streams part of zlib, and wrappers
for the checksum parts of zlib. See DotZLib/UnitTests.cs for examples.
Directory structure:
--------------------
LICENSE_1_0.txt - License file.
readme.txt - This file.
DotZLib.chm - Class library documentation
DotZLib.build - NAnt build file
DotZLib.sln - Microsoft Visual Studio 2003 solution file
DotZLib\*.cs - Source files for the class library
Unit tests:
-----------
The file DotZLib/UnitTests.cs contains unit tests for use with NUnit 2.1 or higher.
To include unit tests in the build, define nunit before building.
Build instructions:
-------------------
1. Using Visual Studio.Net 2003:
Open DotZLib.sln in VS.Net and build from there. Output file (DotZLib.dll)
will be found ./DotZLib/bin/release or ./DotZLib/bin/debug, depending on
you are building the release or debug version of the library. Check
DotZLib/UnitTests.cs for instructions on how to include unit tests in the
build.
2. Using NAnt:
Open a command prompt with access to the build environment and run nant
in the same directory as the DotZLib.build file.
You can define 2 properties on the nant command-line to control the build:
debug={true|false} to toggle between release/debug builds (default=true).
nunit={true|false} to include or esclude unit tests (default=true).
Also the target clean will remove binaries.
Output file (DotZLib.dll) will be found in either ./DotZLib/bin/release
or ./DotZLib/bin/debug, depending on whether you are building the release
or debug version of the library.
Examples:
nant -D:debug=false -D:nunit=false
will build a release mode version of the library without unit tests.
nant
will build a debug version of the library with unit tests
nant clean
will remove all previously built files.
---------------------------------
Copyright (c) Henrik Ravn 2004
Use, modification and distribution are subject to the Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

4
libz/contrib/infback9/inftree9.c
View File

@@ -9,7 +9,7 @@
#define MAXBITS 15
const char inflate9_copyright[] =
" inflate9 1.2.12 Copyright 1995-2022 Mark Adler ";
" inflate9 1.2.13 Copyright 1995-2022 Mark Adler ";
/*
If you use the zlib library in a product, an acknowledgment is welcome
in the documentation of your product. If for some reason you cannot
@@ -64,7 +64,7 @@ unsigned short FAR *work;
static const unsigned short lext[31] = { /* Length codes 257..285 extra */
128, 128, 128, 128, 128, 128, 128, 128, 129, 129, 129, 129,
130, 130, 130, 130, 131, 131, 131, 131, 132, 132, 132, 132,
133, 133, 133, 133, 144, 199, 202};
133, 133, 133, 133, 144, 194, 65};
static const unsigned short dbase[32] = { /* Distance codes 0..31 base */
1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49,
65, 97, 129, 193, 257, 385, 513, 769, 1025, 1537, 2049, 3073,

2
libz/contrib/infback9/inftree9.h
View File

@@ -38,7 +38,7 @@ typedef struct {
/* Maximum size of the dynamic table. The maximum number of code structures is
1446, which is the sum of 852 for literal/length codes and 594 for distance
codes. These values were found by exhaustive searches using the program
examples/enough.c found in the zlib distribtution. The arguments to that
examples/enough.c found in the zlib distribution. The arguments to that
program are the number of symbols, the initial root table size, and the
maximum bit length of a code. "enough 286 9 15" for literal/length codes
returns returns 852, and "enough 32 6 15" for distance codes returns 594.

2
libz/contrib/minizip/configure.ac
View File

@@ -1,7 +1,7 @@
# -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.
AC_INIT([minizip], [1.2.12], [bugzilla.redhat.com])
AC_INIT([minizip], [1.2.13], [bugzilla.redhat.com])
AC_CONFIG_SRCDIR([minizip.c])
AM_INIT_AUTOMAKE([foreign])
LT_INIT

2
libz/contrib/minizip/crypt.h
View File

@@ -85,7 +85,7 @@ static void init_keys(const char* passwd,unsigned long* pkeys,const z_crc_t* pcr
#define RAND_HEAD_LEN 12
/* "last resort" source for second part of crypt seed pattern */
# ifndef ZCR_SEED2
# define ZCR_SEED2 3141592654L /* use PI as default pattern */
# define ZCR_SEED2 3141592654UL /* use PI as default pattern */
# endif
static unsigned crypthead(const char* passwd, /* password string */

22
libz/contrib/minizip/ioapi.c
View File

@@ -94,9 +94,9 @@ static int ZCALLBACK ferror_file_func OF((voidpf opaque, voidpf stream));
static voidpf ZCALLBACK fopen_file_func (voidpf opaque, const char* filename, int mode)
{
(void)opaque;
FILE* file = NULL;
const char* mode_fopen = NULL;
(void)opaque;
if ((mode & ZLIB_FILEFUNC_MODE_READWRITEFILTER)==ZLIB_FILEFUNC_MODE_READ)
mode_fopen = "rb";
else
@@ -113,9 +113,9 @@ static voidpf ZCALLBACK fopen_file_func (voidpf opaque, const char* filename, in
static voidpf ZCALLBACK fopen64_file_func (voidpf opaque, const void* filename, int mode)
{
(void)opaque;
FILE* file = NULL;
const char* mode_fopen = NULL;
(void)opaque;
if ((mode & ZLIB_FILEFUNC_MODE_READWRITEFILTER)==ZLIB_FILEFUNC_MODE_READ)
mode_fopen = "rb";
else
@@ -133,24 +133,24 @@ static voidpf ZCALLBACK fopen64_file_func (voidpf opaque, const void* filename,
static uLong ZCALLBACK fread_file_func (voidpf opaque, voidpf stream, void* buf, uLong size)
{
(void)opaque;
uLong ret;
(void)opaque;
ret = (uLong)fread(buf, 1, (size_t)size, (FILE *)stream);
return ret;
}
static uLong ZCALLBACK fwrite_file_func (voidpf opaque, voidpf stream, const void* buf, uLong size)
{
(void)opaque;
uLong ret;
(void)opaque;
ret = (uLong)fwrite(buf, 1, (size_t)size, (FILE *)stream);
return ret;
}
static long ZCALLBACK ftell_file_func (voidpf opaque, voidpf stream)
{
(void)opaque;
long ret;
(void)opaque;
ret = ftell((FILE *)stream);
return ret;
}
@@ -158,17 +158,17 @@ static long ZCALLBACK ftell_file_func (voidpf opaque, voidpf stream)
static ZPOS64_T ZCALLBACK ftell64_file_func (voidpf opaque, voidpf stream)
{
(void)opaque;
ZPOS64_T ret;
(void)opaque;
ret = (ZPOS64_T)FTELLO_FUNC((FILE *)stream);
return ret;
}
static long ZCALLBACK fseek_file_func (voidpf opaque, voidpf stream, uLong offset, int origin)
{
(void)opaque;
int fseek_origin=0;
long ret;
(void)opaque;
switch (origin)
{
case ZLIB_FILEFUNC_SEEK_CUR :
@@ -190,9 +190,9 @@ static long ZCALLBACK fseek_file_func (voidpf opaque, voidpf stream, uLong offs
static long ZCALLBACK fseek64_file_func (voidpf opaque, voidpf stream, ZPOS64_T offset, int origin)
{
(void)opaque;
int fseek_origin=0;
long ret;
(void)opaque;
switch (origin)
{
case ZLIB_FILEFUNC_SEEK_CUR :
@@ -208,7 +208,7 @@ static long ZCALLBACK fseek64_file_func (voidpf opaque, voidpf stream, ZPOS64_T
}
ret = 0;
if(FSEEKO_FUNC((FILE *)stream, (long)offset, fseek_origin) != 0)
if(FSEEKO_FUNC((FILE *)stream, (z_off_t)offset, fseek_origin) != 0)
ret = -1;
return ret;
@@ -217,16 +217,16 @@ static long ZCALLBACK fseek64_file_func (voidpf opaque, voidpf stream, ZPOS64_T
static int ZCALLBACK fclose_file_func (voidpf opaque, voidpf stream)
{
(void)opaque;
int ret;
(void)opaque;
ret = fclose((FILE *)stream);
return ret;
}
static int ZCALLBACK ferror_file_func (voidpf opaque, voidpf stream)
{
(void)opaque;
int ret;
(void)opaque;
ret = ferror((FILE *)stream);
return ret;
}

2
libz/contrib/minizip/ioapi.h
View File

@@ -50,7 +50,7 @@
#define ftello64 ftell
#define fseeko64 fseek
#else
#ifdef __FreeBSD__
#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
#define fopen64 fopen
#define ftello64 ftello
#define fseeko64 fseeko

5
libz/contrib/minizip/iowin32.c
View File

@@ -28,6 +28,11 @@
// see Include/shared/winapifamily.h in the Windows Kit
#if defined(WINAPI_FAMILY_PARTITION) && (!(defined(IOWIN32_USING_WINRT_API)))
#if !defined(WINAPI_FAMILY_ONE_PARTITION)
#define WINAPI_FAMILY_ONE_PARTITION(PartitionSet, Partition) ((WINAPI_FAMILY & PartitionSet) == Partition)
#endif
#if WINAPI_FAMILY_ONE_PARTITION(WINAPI_FAMILY, WINAPI_PARTITION_APP)
#define IOWIN32_USING_WINRT_API 1
#endif

2
libz/contrib/minizip/miniunz.c
View File

@@ -564,7 +564,7 @@ int main(argc,argv)
while ((*p)!='\0')
{
char c=*(p++);;
char c=*(p++);
if ((c=='l') || (c=='L'))
opt_do_list = 1;
if ((c=='v') || (c=='V'))

6
libz/contrib/minizip/minizip.c
View File

@@ -190,7 +190,7 @@ static int getFileCrc(const char* filenameinzip,void*buf,unsigned long size_buf,
FILE * fin = FOPEN_FUNC(filenameinzip,"rb");
unsigned long size_read = 0;
unsigned long total_read = 0;
/* unsigned long total_read = 0; */
if (fin==NULL)
{
err = ZIP_ERRNO;
@@ -210,7 +210,7 @@ static int getFileCrc(const char* filenameinzip,void*buf,unsigned long size_buf,
if (size_read>0)
calculate_crc = crc32_z(calculate_crc,buf,size_read);
total_read += size_read;
/* total_read += size_read; */
} while ((err == ZIP_OK) && (size_read>0));
@@ -277,7 +277,7 @@ int main(argc,argv)
while ((*p)!='\0')
{
char c=*(p++);;
char c=*(p++);
if ((c=='o') || (c=='O'))
opt_overwrite = 1;
if ((c=='a') || (c=='A'))

4
libz/contrib/minizip/unzip.c
View File

@@ -112,7 +112,7 @@
# define ALLOC(size) (malloc(size))
#endif
#ifndef TRYFREE
# define TRYFREE(p) {if (p) free(p);}
# define TRYFREE(p) { free(p);}
#endif
#define SIZECENTRALDIRITEM (0x2e)
@@ -1566,6 +1566,7 @@ extern int ZEXPORT unzOpenCurrentFile3 (unzFile file, int* method,
pfile_in_zip_read_info->stream_initialised=Z_BZIP2ED;
else
{
TRYFREE(pfile_in_zip_read_info->read_buffer);
TRYFREE(pfile_in_zip_read_info);
return err;
}
@@ -1586,6 +1587,7 @@ extern int ZEXPORT unzOpenCurrentFile3 (unzFile file, int* method,
pfile_in_zip_read_info->stream_initialised=Z_DEFLATED;
else
{
TRYFREE(pfile_in_zip_read_info->read_buffer);
TRYFREE(pfile_in_zip_read_info);
return err;
}

7
libz/contrib/minizip/zip.c
View File

@@ -1471,11 +1471,6 @@ extern int ZEXPORT zipWriteInFileInZip (zipFile file,const void* buf,unsigned in
{
uLong uTotalOutBefore = zi->ci.stream.total_out;
err=deflate(&zi->ci.stream, Z_NO_FLUSH);
if(uTotalOutBefore > zi->ci.stream.total_out)
{
int bBreak = 0;
bBreak++;
}
zi->ci.pos_in_buffered_data += (uInt)(zi->ci.stream.total_out - uTotalOutBefore) ;
}
@@ -1959,7 +1954,7 @@ extern int ZEXPORT zipRemoveExtraInfoBlock (char* pData, int* dataLen, short sHe
int retVal = ZIP_OK;
if(pData == NULL || *dataLen < 4)
if(pData == NULL || dataLen == NULL || *dataLen < 4)
return ZIP_PARAMERROR;
pNewHeader = (char*)ALLOC((unsigned)*dataLen);

2
libz/contrib/pascal/zlibpas.pas
View File

@@ -10,7 +10,7 @@ unit zlibpas;
interface
const
ZLIB_VERSION = '1.2.12';
ZLIB_VERSION = '1.2.13';
ZLIB_VERNUM = $12a0;
type

2
libz/contrib/puff/README
View File

@@ -38,7 +38,7 @@ Then you can call puff() to decompress a deflate stream that is in memory in
its entirety at source, to a sufficiently sized block of memory for the
decompressed data at dest. puff() is the only external symbol in puff.c The
only C library functions that puff.c needs are setjmp() and longjmp(), which
are used to simplify error checking in the code to improve readabilty. puff.c
are used to simplify error checking in the code to improve readability. puff.c
does no memory allocation, and uses less than 2K bytes off of the stack.
If destlen is not enough space for the uncompressed data, then inflate will

4
libz/contrib/puff/puff.c
View File

@@ -43,7 +43,7 @@
* - Use pointers instead of long to specify source and
* destination sizes to avoid arbitrary 4 GB limits
* 1.2 17 Mar 2002 - Add faster version of decode(), doubles speed (!),
* but leave simple version for readabilty
* but leave simple version for readability
* - Make sure invalid distances detected if pointers
* are 16 bits
* - Fix fixed codes table error
@@ -624,7 +624,7 @@ local int fixed(struct state *s)
* are themselves compressed using Huffman codes and run-length encoding. In
* the list of code lengths, a 0 symbol means no code, a 1..15 symbol means
* that length, and the symbols 16, 17, and 18 are run-length instructions.
* Each of 16, 17, and 18 are follwed by extra bits to define the length of
* Each of 16, 17, and 18 are followed by extra bits to define the length of
* the run. 16 copies the last length 3 to 6 times. 17 represents 3 to 10
* zero lengths, and 18 represents 11 to 138 zero lengths. Unused symbols
* are common, hence the special coding for zero lengths.

2
libz/contrib/puff/pufftest.c
View File

@@ -143,7 +143,7 @@ int main(int argc, char **argv)
len - sourcelen);
}
/* if requested, inflate again and write decompressd data to stdout */
/* if requested, inflate again and write decompressed data to stdout */
if (put && ret == 0) {
if (fail)
destlen >>= 1;

BIN
libz/contrib/puff/zeros.raw Normal file
View File

Binary file not shown.

5
libz/contrib/vstudio/readme.txt
View File

@@ -1,4 +1,4 @@
Building instructions for the DLL versions of Zlib 1.2.12
Building instructions for the DLL versions of Zlib 1.2.13
========================================================
This directory contains projects that build zlib and minizip using
@@ -17,9 +17,6 @@ More information can be found at this site.
Build instructions for Visual Studio 2008 (32 bits or 64 bits)
--------------------------------------------------------------
- Decompress current zlib, including all contrib/* files
- Compile assembly code (with Visual Studio Command Prompt) by running:
bld_ml64.bat (in contrib\masmx64)
bld_ml32.bat (in contrib\masmx86)
- Open contrib\vstudio\vc9\zlibvc.sln with Microsoft Visual C++ 2008
- Or run: vcbuild /rebuild contrib\vstudio\vc9\zlibvc.sln "Release|Win32"

2
libz/contrib/vstudio/vc10/miniunz.vcxproj.filters
View File

@@ -3,7 +3,7 @@
<ItemGroup>
<Filter Include="Source Files">
<UniqueIdentifier>{048af943-022b-4db6-beeb-a54c34774ee2}</UniqueIdentifier>
<Extensions>cpp;c;cxx;def;odl;idl;hpj;bat;asm</Extensions>
<Extensions>cpp;c;cxx;def;odl;idl;hpj;bat</Extensions>
</Filter>
<Filter Include="Header Files">
<UniqueIdentifier>{c1d600d2-888f-4aea-b73e-8b0dd9befa0c}</UniqueIdentifier>

2
libz/contrib/vstudio/vc10/minizip.vcxproj.filters
View File

@@ -3,7 +3,7 @@
<ItemGroup>
<Filter Include="Source Files">
<UniqueIdentifier>{c0419b40-bf50-40da-b153-ff74215b79de}</UniqueIdentifier>
<Extensions>cpp;c;cxx;def;odl;idl;hpj;bat;asm</Extensions>
<Extensions>cpp;c;cxx;def;odl;idl;hpj;bat</Extensions>
</Filter>
<Filter Include="Header Files">
<UniqueIdentifier>{bb87b070-735b-478e-92ce-7383abb2f36c}</UniqueIdentifier>

24
libz/contrib/vstudio/vc10/testzlib.vcxproj
View File

@@ -181,7 +181,7 @@
<ClCompile>
<Optimization>Disabled</Optimization>
<AdditionalIncludeDirectories>..\..\..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>ASMV;ASMINF;WIN32;ZLIB_WINAPI;_DEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<PreprocessorDefinitions>WIN32;ZLIB_WINAPI;_DEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<MinimalRebuild>true</MinimalRebuild>
<BasicRuntimeChecks>Default</BasicRuntimeChecks>
<RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
@@ -194,7 +194,7 @@
<DebugInformationFormat>EditAndContinue</DebugInformationFormat>
</ClCompile>
<Link>
<AdditionalDependencies>..\..\masmx86\match686.obj;..\..\masmx86\inffas32.obj;%(AdditionalDependencies)</AdditionalDependencies>
<AdditionalDependencies>%(AdditionalDependencies)</AdditionalDependencies>
<OutputFile>$(OutDir)testzlib.exe</OutputFile>
<GenerateDebugInformation>true</GenerateDebugInformation>
<ProgramDatabaseFile>$(OutDir)testzlib.pdb</ProgramDatabaseFile>
@@ -241,7 +241,7 @@
<InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
<OmitFramePointers>true</OmitFramePointers>
<AdditionalIncludeDirectories>..\..\..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>ASMV;ASMINF;WIN32;ZLIB_WINAPI;NDEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<PreprocessorDefinitions>WIN32;ZLIB_WINAPI;NDEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<StringPooling>true</StringPooling>
<BasicRuntimeChecks>Default</BasicRuntimeChecks>
<RuntimeLibrary>MultiThreaded</RuntimeLibrary>
@@ -254,7 +254,7 @@
<DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
</ClCompile>
<Link>
<AdditionalDependencies>..\..\masmx86\match686.obj;..\..\masmx86\inffas32.obj;%(AdditionalDependencies)</AdditionalDependencies>
<AdditionalDependencies>%(AdditionalDependencies)</AdditionalDependencies>
<OutputFile>$(OutDir)testzlib.exe</OutputFile>
<GenerateDebugInformation>true</GenerateDebugInformation>
<SubSystem>Console</SubSystem>
@@ -269,14 +269,14 @@
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
<ClCompile>
<AdditionalIncludeDirectories>..\..\..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>ASMV;ASMINF;WIN32;ZLIB_WINAPI;_DEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<PreprocessorDefinitions>WIN32;ZLIB_WINAPI;_DEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<BasicRuntimeChecks>Default</BasicRuntimeChecks>
<RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
<BufferSecurityCheck>false</BufferSecurityCheck>
<AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
</ClCompile>
<Link>
<AdditionalDependencies>..\..\masmx64\gvmat64.obj;..\..\masmx64\inffasx64.obj;%(AdditionalDependencies)</AdditionalDependencies>
<AdditionalDependencies>%(AdditionalDependencies)</AdditionalDependencies>
</Link>
</ItemDefinitionGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Itanium'">
@@ -352,14 +352,14 @@
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
<ClCompile>
<AdditionalIncludeDirectories>..\..\..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>ASMV;ASMINF;WIN32;ZLIB_WINAPI;NDEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<PreprocessorDefinitions>WIN32;ZLIB_WINAPI;NDEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<BasicRuntimeChecks>Default</BasicRuntimeChecks>
<RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
<BufferSecurityCheck>false</BufferSecurityCheck>
<AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
</ClCompile>
<Link>
<AdditionalDependencies>..\..\masmx64\gvmat64.obj;..\..\masmx64\inffasx64.obj;%(AdditionalDependencies)</AdditionalDependencies>
<AdditionalDependencies>%(AdditionalDependencies)</AdditionalDependencies>
</Link>
</ItemDefinitionGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Itanium'">
@@ -398,14 +398,6 @@
<ClCompile Include="..\..\..\crc32.c" />
<ClCompile Include="..\..\..\deflate.c" />
<ClCompile Include="..\..\..\infback.c" />
<ClCompile Include="..\..\masmx64\inffas8664.c">
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Itanium'">true</ExcludedFromBuild>
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Itanium'">true</ExcludedFromBuild>
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Win32'">true</ExcludedFromBuild>
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Itanium'">true</ExcludedFromBuild>
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
</ClCompile>
<ClCompile Include="..\..\..\inffast.c" />
<ClCompile Include="..\..\..\inflate.c" />
<ClCompile Include="..\..\..\inftrees.c" />

5
libz/contrib/vstudio/vc10/testzlib.vcxproj.filters
View File

@@ -3,7 +3,7 @@
<ItemGroup>
<Filter Include="Source Files">
<UniqueIdentifier>{c1f6a2e3-5da5-4955-8653-310d3efe05a9}</UniqueIdentifier>
<Extensions>cpp;c;cxx;def;odl;idl;hpj;bat;asm</Extensions>
<Extensions>cpp;c;cxx;def;odl;idl;hpj;bat</Extensions>
</Filter>
<Filter Include="Header Files">
<UniqueIdentifier>{c2aaffdc-2c95-4d6f-8466-4bec5890af2c}</UniqueIdentifier>
@@ -30,9 +30,6 @@
<ClCompile Include="..\..\..\infback.c">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="..\..\masmx64\inffas8664.c">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="..\..\..\inffast.c">
<Filter>Source Files</Filter>
</ClCompile>

2
libz/contrib/vstudio/vc10/testzlibdll.vcxproj.filters
View File

@@ -3,7 +3,7 @@
<ItemGroup>
<Filter Include="Source Files">
<UniqueIdentifier>{fa61a89f-93fc-4c89-b29e-36224b7592f4}</UniqueIdentifier>
<Extensions>cpp;c;cxx;def;odl;idl;hpj;bat;asm</Extensions>
<Extensions>cpp;c;cxx;def;odl;idl;hpj;bat</Extensions>
</Filter>
<Filter Include="Header Files">
<UniqueIdentifier>{d4b85da0-2ba2-4934-b57f-e2584e3848ee}</UniqueIdentifier>

6
libz/contrib/vstudio/vc10/zlib.rc
View File

@@ -2,8 +2,8 @@
#define IDR_VERSION1 1
IDR_VERSION1 VERSIONINFO MOVEABLE IMPURE LOADONCALL DISCARDABLE
FILEVERSION 1, 2, 12, 0
PRODUCTVERSION 1, 2, 12, 0
FILEVERSION 1, 2, 13, 0
PRODUCTVERSION 1, 2, 13, 0
FILEFLAGSMASK VS_FFI_FILEFLAGSMASK
FILEFLAGS 0
FILEOS VOS_DOS_WINDOWS32
@@ -17,7 +17,7 @@ BEGIN
BEGIN
VALUE "FileDescription", "zlib data compression and ZIP file I/O library\0"
VALUE "FileVersion", "1.2.12\0"
VALUE "FileVersion", "1.2.13\0"
VALUE "InternalName", "zlib\0"
VALUE "OriginalFilename", "zlibwapi.dll\0"
VALUE "ProductName", "ZLib.DLL\0"

50
libz/contrib/vstudio/vc10/zlibstat.vcxproj
View File

@@ -160,7 +160,7 @@
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
<ClCompile>
<Optimization>Disabled</Optimization>
<AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<AdditionalIncludeDirectories>%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>WIN32;ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<ExceptionHandling>
</ExceptionHandling>
@@ -182,16 +182,12 @@
<OutputFile>$(OutDir)zlibstat.lib</OutputFile>
<SuppressStartupBanner>true</SuppressStartupBanner>
</Lib>
<PreBuildEvent>
<Command>cd ..\..\masmx86
bld_ml32.bat</Command>
</PreBuildEvent>
</ItemDefinitionGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
<ClCompile>
<InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
<AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>WIN32;ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ASMV;ASMINF;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<AdditionalIncludeDirectories>..\..\..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>WIN32;ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<StringPooling>true</StringPooling>
<ExceptionHandling>
</ExceptionHandling>
@@ -210,19 +206,15 @@ bld_ml32.bat</Command>
</ResourceCompile>
<Lib>
<AdditionalOptions>/MACHINE:X86 /NODEFAULTLIB %(AdditionalOptions)</AdditionalOptions>
<AdditionalDependencies>..\..\masmx86\match686.obj;..\..\masmx86\inffas32.obj;%(AdditionalDependencies)</AdditionalDependencies>
<AdditionalDependencies>%(AdditionalDependencies)</AdditionalDependencies>
<OutputFile>$(OutDir)zlibstat.lib</OutputFile>
<SuppressStartupBanner>true</SuppressStartupBanner>
</Lib>
<PreBuildEvent>
<Command>cd ..\..\masmx86
bld_ml32.bat</Command>
</PreBuildEvent>
</ItemDefinitionGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Win32'">
<ClCompile>
<InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
<AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<AdditionalIncludeDirectories>..\..\..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>WIN32;ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<StringPooling>true</StringPooling>
<ExceptionHandling>
@@ -252,7 +244,7 @@ bld_ml32.bat</Command>
</Midl>
<ClCompile>
<Optimization>Disabled</Optimization>
<AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<AdditionalIncludeDirectories>..\..\..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
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<ExceptionHandling>
</ExceptionHandling>
@@ -274,10 +266,6 @@ bld_ml32.bat</Command>
<OutputFile>$(OutDir)zlibstat.lib</OutputFile>
<SuppressStartupBanner>true</SuppressStartupBanner>
</Lib>
<PreBuildEvent>
<Command>cd ..\..\masmx64
bld_ml64.bat</Command>
</PreBuildEvent>
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<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Itanium'">
<Midl>
@@ -285,7 +273,7 @@ bld_ml64.bat</Command>
</Midl>
<ClCompile>
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<AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
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<ExceptionHandling>
</ExceptionHandling>
@@ -314,8 +302,8 @@ bld_ml64.bat</Command>
</Midl>
<ClCompile>
<InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
<AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
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<PreprocessorDefinitions>ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<StringPooling>true</StringPooling>
<ExceptionHandling>
</ExceptionHandling>
@@ -334,14 +322,10 @@ bld_ml64.bat</Command>
</ResourceCompile>
<Lib>
<AdditionalOptions>/MACHINE:AMD64 /NODEFAULTLIB %(AdditionalOptions)</AdditionalOptions>
<AdditionalDependencies>..\..\masmx64\gvmat64.obj;..\..\masmx64\inffasx64.obj;%(AdditionalDependencies)</AdditionalDependencies>
<AdditionalDependencies>%(AdditionalDependencies)</AdditionalDependencies>
<OutputFile>$(OutDir)zlibstat.lib</OutputFile>
<SuppressStartupBanner>true</SuppressStartupBanner>
</Lib>
<PreBuildEvent>
<Command>cd ..\..\masmx64
bld_ml64.bat</Command>
</PreBuildEvent>
</ItemDefinitionGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Itanium'">
<Midl>
@@ -349,7 +333,7 @@ bld_ml64.bat</Command>
</Midl>
<ClCompile>
<InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
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<PreprocessorDefinitions>ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<StringPooling>true</StringPooling>
<ExceptionHandling>
@@ -379,7 +363,7 @@ bld_ml64.bat</Command>
</Midl>
<ClCompile>
<InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
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<StringPooling>true</StringPooling>
<ExceptionHandling>
@@ -409,7 +393,7 @@ bld_ml64.bat</Command>
</Midl>
<ClCompile>
<InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
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<AdditionalIncludeDirectories>..\..\..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<StringPooling>true</StringPooling>
<ExceptionHandling>
@@ -443,14 +427,6 @@ bld_ml64.bat</Command>
<ClCompile Include="..\..\..\gzread.c" />
<ClCompile Include="..\..\..\gzwrite.c" />
<ClCompile Include="..\..\..\infback.c" />
<ClCompile Include="..\..\masmx64\inffas8664.c">
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Itanium'">true</ExcludedFromBuild>
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Itanium'">true</ExcludedFromBuild>
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Win32'">true</ExcludedFromBuild>
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Itanium'">true</ExcludedFromBuild>
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
</ClCompile>
<ClCompile Include="..\..\..\inffast.c" />
<ClCompile Include="..\..\..\inflate.c" />
<ClCompile Include="..\..\..\inftrees.c" />

3
libz/contrib/vstudio/vc10/zlibstat.vcxproj.filters
View File

@@ -33,9 +33,6 @@
<ClCompile Include="..\..\..\infback.c">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="..\..\masmx64\inffas8664.c">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="..\..\..\inffast.c">
<Filter>Source Files</Filter>
</ClCompile>

58
libz/contrib/vstudio/vc10/zlibvc.vcxproj
View File

@@ -197,8 +197,8 @@
</Midl>
<ClCompile>
<Optimization>Disabled</Optimization>
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<AdditionalIncludeDirectories>..\..\..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<ExceptionHandling>
</ExceptionHandling>
<RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
@@ -219,7 +219,7 @@
</ResourceCompile>
<Link>
<AdditionalOptions>/MACHINE:I386 %(AdditionalOptions)</AdditionalOptions>
<AdditionalDependencies>..\..\masmx86\match686.obj;..\..\masmx86\inffas32.obj;%(AdditionalDependencies)</AdditionalDependencies>
<AdditionalDependencies>%(AdditionalDependencies)</AdditionalDependencies>
<SuppressStartupBanner>true</SuppressStartupBanner>
<ModuleDefinitionFile>.\zlibvc.def</ModuleDefinitionFile>
<GenerateDebugInformation>true</GenerateDebugInformation>
@@ -229,10 +229,6 @@
<DataExecutionPrevention>
</DataExecutionPrevention>
</Link>
<PreBuildEvent>
<Command>cd ..\..\masmx86
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</PreBuildEvent>
</ItemDefinitionGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Win32'">
<Midl>
@@ -244,7 +240,7 @@ bld_ml32.bat</Command>
</Midl>
<ClCompile>
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@@ -288,8 +284,8 @@ bld_ml32.bat</Command>
</Midl>
<ClCompile>
<InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
<AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
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<AdditionalIncludeDirectories>..\..\..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<StringPooling>true</StringPooling>
<ExceptionHandling>
</ExceptionHandling>
@@ -312,7 +308,7 @@ bld_ml32.bat</Command>
</ResourceCompile>
<Link>
<AdditionalOptions>/MACHINE:I386 %(AdditionalOptions)</AdditionalOptions>
<AdditionalDependencies>..\..\masmx86\match686.obj;..\..\masmx86\inffas32.obj;%(AdditionalDependencies)</AdditionalDependencies>
<AdditionalDependencies>%(AdditionalDependencies)</AdditionalDependencies>
<SuppressStartupBanner>true</SuppressStartupBanner>
<IgnoreAllDefaultLibraries>false</IgnoreAllDefaultLibraries>
<ModuleDefinitionFile>.\zlibvc.def</ModuleDefinitionFile>
@@ -322,10 +318,6 @@ bld_ml32.bat</Command>
<DataExecutionPrevention>
</DataExecutionPrevention>
</Link>
<PreBuildEvent>
<Command>cd ..\..\masmx86
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<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
<Midl>
@@ -337,8 +329,8 @@ bld_ml32.bat</Command>
</Midl>
<ClCompile>
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<PreprocessorDefinitions>WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;ASMV;ASMINF;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<AdditionalIncludeDirectories>..\..\..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
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<ExceptionHandling>
</ExceptionHandling>
<RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
@@ -358,7 +350,7 @@ bld_ml32.bat</Command>
<Culture>0x040c</Culture>
</ResourceCompile>
<Link>
<AdditionalDependencies>..\..\masmx64\gvmat64.obj;..\..\masmx64\inffasx64.obj;%(AdditionalDependencies)</AdditionalDependencies>
<AdditionalDependencies>%(AdditionalDependencies)</AdditionalDependencies>
<SuppressStartupBanner>true</SuppressStartupBanner>
<ModuleDefinitionFile>.\zlibvc.def</ModuleDefinitionFile>
<GenerateDebugInformation>true</GenerateDebugInformation>
@@ -366,10 +358,6 @@ bld_ml32.bat</Command>
<SubSystem>Windows</SubSystem>
<TargetMachine>MachineX64</TargetMachine>
</Link>
<PreBuildEvent>
<Command>cd ..\..\masmx64
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<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Itanium'">
<Midl>
@@ -381,7 +369,7 @@ bld_ml64.bat</Command>
</Midl>
<ClCompile>
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<AdditionalIncludeDirectories>..\..\..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
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<ExceptionHandling>
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@@ -424,7 +412,7 @@ bld_ml64.bat</Command>
</Midl>
<ClCompile>
<InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
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@@ -465,7 +453,7 @@ bld_ml64.bat</Command>
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@@ -510,8 +498,8 @@ bld_ml64.bat</Command>
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<ClCompile>
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@@ -533,7 +521,7 @@ bld_ml64.bat</Command>
<Culture>0x040c</Culture>
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<Link>
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@@ -541,10 +529,6 @@ bld_ml64.bat</Command>
<SubSystem>Windows</SubSystem>
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<PreBuildEvent>
<Command>cd ..\..\masmx64
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<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Itanium'">
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@@ -601,14 +585,6 @@ bld_ml64.bat</Command>
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3
libz/contrib/vstudio/vc10/zlibvc.vcxproj.filters
View File

@@ -42,9 +42,6 @@
<ClCompile Include="..\..\..\infback.c">
<Filter>Source Files</Filter>
</ClCompile>
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<Filter>Source Files</Filter>
</ClCompile>
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<Filter>Source Files</Filter>
</ClCompile>

24
libz/contrib/vstudio/vc11/testzlib.vcxproj
View File

@@ -187,7 +187,7 @@
<ClCompile>
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<PreprocessorDefinitions>WIN32;ZLIB_WINAPI;_DEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<BasicRuntimeChecks>Default</BasicRuntimeChecks>
<RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
@@ -200,7 +200,7 @@
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<ProgramDatabaseFile>$(OutDir)testzlib.pdb</ProgramDatabaseFile>
@@ -247,7 +247,7 @@
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@@ -260,7 +260,7 @@
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@@ -404,14 +404,6 @@
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6
libz/contrib/vstudio/vc11/zlib.rc
View File

@@ -2,8 +2,8 @@
#define IDR_VERSION1 1
IDR_VERSION1 VERSIONINFO MOVEABLE IMPURE LOADONCALL DISCARDABLE
FILEVERSION 1, 2, 12, 0
PRODUCTVERSION 1, 2, 12, 0
FILEVERSION 1, 2, 13, 0
PRODUCTVERSION 1, 2, 13, 0
FILEFLAGSMASK VS_FFI_FILEFLAGSMASK
FILEFLAGS 0
FILEOS VOS_DOS_WINDOWS32
@@ -17,7 +17,7 @@ BEGIN
BEGIN
VALUE "FileDescription", "zlib data compression and ZIP file I/O library\0"
VALUE "FileVersion", "1.2.12\0"
VALUE "FileVersion", "1.2.13\0"
VALUE "InternalName", "zlib\0"
VALUE "OriginalFilename", "zlibwapi.dll\0"
VALUE "ProductName", "ZLib.DLL\0"

34
libz/contrib/vstudio/vc11/zlibstat.vcxproj
View File

@@ -167,7 +167,7 @@
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@@ -221,7 +221,7 @@
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@@ -251,7 +251,7 @@
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@@ -280,7 +280,7 @@
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@@ -309,8 +309,8 @@
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@@ -329,7 +329,7 @@
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<Lib>
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<AdditionalDependencies>..\..\masmx64\gvmat64.obj;..\..\masmx64\inffasx64.obj;%(AdditionalDependencies)</AdditionalDependencies>
<AdditionalDependencies>%(AdditionalDependencies)</AdditionalDependencies>
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@@ -340,7 +340,7 @@
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@@ -434,14 +434,6 @@
<ClCompile Include="..\..\..\gzread.c" />
<ClCompile Include="..\..\..\gzwrite.c" />
<ClCompile Include="..\..\..\infback.c" />
<ClCompile Include="..\..\masmx64\inffas8664.c">
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Itanium'">true</ExcludedFromBuild>
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Itanium'">true</ExcludedFromBuild>
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<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Itanium'">true</ExcludedFromBuild>
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<ClCompile Include="..\..\..\inflate.c" />
<ClCompile Include="..\..\..\inftrees.c" />

58
libz/contrib/vstudio/vc11/zlibvc.vcxproj
View File

@@ -204,8 +204,8 @@
</Midl>
<ClCompile>
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@@ -226,7 +226,7 @@
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@@ -240,10 +240,6 @@
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@@ -255,7 +251,7 @@ bld_ml32.bat</Command>
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@@ -303,8 +299,8 @@ bld_ml32.bat</Command>
</Midl>
<ClCompile>
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<AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
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@@ -327,7 +323,7 @@ bld_ml32.bat</Command>
</ResourceCompile>
<Link>
<AdditionalOptions>/MACHINE:I386 %(AdditionalOptions)</AdditionalOptions>
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@@ -341,10 +337,6 @@ bld_ml32.bat</Command>
</DataExecutionPrevention>
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<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
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@@ -356,8 +348,8 @@ bld_ml32.bat</Command>
</Midl>
<ClCompile>
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</ExceptionHandling>
<RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
@@ -377,7 +369,7 @@ bld_ml32.bat</Command>
<Culture>0x040c</Culture>
</ResourceCompile>
<Link>
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@@ -389,10 +381,6 @@ bld_ml32.bat</Command>
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<Midl>
@@ -404,7 +392,7 @@ bld_ml64.bat</Command>
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<ClCompile>
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@@ -447,7 +435,7 @@ bld_ml64.bat</Command>
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<ClCompile>
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@@ -492,7 +480,7 @@ bld_ml64.bat</Command>
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@@ -537,8 +525,8 @@ bld_ml64.bat</Command>
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@@ -560,7 +548,7 @@ bld_ml64.bat</Command>
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@@ -572,10 +560,6 @@ bld_ml64.bat</Command>
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@@ -632,14 +616,6 @@ bld_ml64.bat</Command>
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24
libz/contrib/vstudio/vc12/testzlib.vcxproj
View File

@@ -190,7 +190,7 @@
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@@ -203,7 +203,7 @@
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@@ -250,7 +250,7 @@
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6
libz/contrib/vstudio/vc12/zlib.rc
View File

@@ -2,8 +2,8 @@
#define IDR_VERSION1 1
IDR_VERSION1 VERSIONINFO MOVEABLE IMPURE LOADONCALL DISCARDABLE
FILEVERSION 1, 2, 12, 0
PRODUCTVERSION 1, 2, 12, 0
FILEVERSION 1, 2, 13, 0
PRODUCTVERSION 1, 2, 13, 0
FILEFLAGSMASK VS_FFI_FILEFLAGSMASK
FILEFLAGS 0
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BEGIN
VALUE "FileDescription", "zlib data compression and ZIP file I/O library\0"
VALUE "FileVersion", "1.2.12\0"
VALUE "FileVersion", "1.2.13\0"
VALUE "InternalName", "zlib\0"
VALUE "OriginalFilename", "zlibwapi.dll\0"
VALUE "ProductName", "ZLib.DLL\0"

34
libz/contrib/vstudio/vc12/zlibstat.vcxproj
View File

@@ -170,7 +170,7 @@
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@@ -332,7 +332,7 @@
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@@ -343,7 +343,7 @@
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76
libz/contrib/vstudio/vc12/zlibvc.vcxproj
View File

@@ -46,53 +46,53 @@
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@@ -207,8 +207,8 @@
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@@ -229,7 +229,7 @@
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@@ -243,10 +243,6 @@
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@@ -306,8 +302,8 @@ bld_ml32.bat</Command>
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@@ -330,7 +326,7 @@ bld_ml32.bat</Command>
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@@ -345,10 +341,6 @@ bld_ml32.bat</Command>
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@@ -381,7 +373,7 @@ bld_ml32.bat</Command>
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@@ -393,10 +385,6 @@ bld_ml32.bat</Command>
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@@ -451,7 +439,7 @@ bld_ml64.bat</Command>
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@@ -564,7 +552,7 @@ bld_ml64.bat</Command>
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@@ -576,10 +564,6 @@ bld_ml64.bat</Command>
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24
libz/contrib/vstudio/vc14/testzlib.vcxproj
View File

@@ -190,7 +190,7 @@
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@@ -203,7 +203,7 @@
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6
libz/contrib/vstudio/vc14/zlib.rc
View File

@@ -2,8 +2,8 @@
#define IDR_VERSION1 1
IDR_VERSION1 VERSIONINFO MOVEABLE IMPURE LOADONCALL DISCARDABLE
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FILEFLAGSMASK VS_FFI_FILEFLAGSMASK
FILEFLAGS 0
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BEGIN
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VALUE "FileVersion", "1.2.12\0"
VALUE "FileVersion", "1.2.13\0"
VALUE "InternalName", "zlib\0"
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34
libz/contrib/vstudio/vc14/zlibstat.vcxproj
View File

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<PreprocessorDefinitions>WIN32;ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<StringPooling>true</StringPooling>
<ExceptionHandling>
@@ -254,7 +254,7 @@
</Midl>
<ClCompile>
<Optimization>Disabled</Optimization>
<AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<AdditionalIncludeDirectories>..\..\..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<ExceptionHandling>
</ExceptionHandling>
@@ -283,7 +283,7 @@
</Midl>
<ClCompile>
<Optimization>Disabled</Optimization>
<AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<AdditionalIncludeDirectories>..\..\..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<ExceptionHandling>
</ExceptionHandling>
@@ -312,8 +312,8 @@
</Midl>
<ClCompile>
<InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
<AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ASMV;ASMINF;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<AdditionalIncludeDirectories>..\..\..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<StringPooling>true</StringPooling>
<ExceptionHandling>
</ExceptionHandling>
@@ -332,7 +332,7 @@
</ResourceCompile>
<Lib>
<AdditionalOptions>/MACHINE:AMD64 /NODEFAULTLIB %(AdditionalOptions)</AdditionalOptions>
<AdditionalDependencies>..\..\masmx64\gvmat64.obj;..\..\masmx64\inffasx64.obj;%(AdditionalDependencies)</AdditionalDependencies>
<AdditionalDependencies>%(AdditionalDependencies)</AdditionalDependencies>
<OutputFile>$(OutDir)zlibstat.lib</OutputFile>
<SuppressStartupBanner>true</SuppressStartupBanner>
</Lib>
@@ -343,7 +343,7 @@
</Midl>
<ClCompile>
<InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
<AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<AdditionalIncludeDirectories>..\..\..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<StringPooling>true</StringPooling>
<ExceptionHandling>
@@ -373,7 +373,7 @@
</Midl>
<ClCompile>
<InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
<AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<AdditionalIncludeDirectories>..\..\..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<StringPooling>true</StringPooling>
<ExceptionHandling>
@@ -403,7 +403,7 @@
</Midl>
<ClCompile>
<InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
<AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<AdditionalIncludeDirectories>..\..\..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<StringPooling>true</StringPooling>
<ExceptionHandling>
@@ -437,14 +437,6 @@
<ClCompile Include="..\..\..\gzread.c" />
<ClCompile Include="..\..\..\gzwrite.c" />
<ClCompile Include="..\..\..\infback.c" />
<ClCompile Include="..\..\masmx64\inffas8664.c">
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Itanium'">true</ExcludedFromBuild>
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Itanium'">true</ExcludedFromBuild>
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Win32'">true</ExcludedFromBuild>
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Itanium'">true</ExcludedFromBuild>
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
</ClCompile>
<ClCompile Include="..\..\..\inffast.c" />
<ClCompile Include="..\..\..\inflate.c" />
<ClCompile Include="..\..\..\inftrees.c" />

58
libz/contrib/vstudio/vc14/zlibvc.vcxproj
View File

@@ -207,8 +207,8 @@
</Midl>
<ClCompile>
<Optimization>Disabled</Optimization>
<AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;ASMV;ASMINF;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<AdditionalIncludeDirectories>..\..\..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<ExceptionHandling>
</ExceptionHandling>
<RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
@@ -229,7 +229,7 @@
</ResourceCompile>
<Link>
<AdditionalOptions>/MACHINE:I386 %(AdditionalOptions)</AdditionalOptions>
<AdditionalDependencies>..\..\masmx86\match686.obj;..\..\masmx86\inffas32.obj;%(AdditionalDependencies)</AdditionalDependencies>
<AdditionalDependencies>%(AdditionalDependencies)</AdditionalDependencies>
<OutputFile>$(OutDir)zlibwapi.dll</OutputFile>
<SuppressStartupBanner>true</SuppressStartupBanner>
<ModuleDefinitionFile>.\zlibvc.def</ModuleDefinitionFile>
@@ -243,10 +243,6 @@
</DataExecutionPrevention>
<ImportLibrary>$(OutDir)zlibwapi.lib</ImportLibrary>
</Link>
<PreBuildEvent>
<Command>cd ..\..\masmx86
bld_ml32.bat</Command>
</PreBuildEvent>
</ItemDefinitionGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Win32'">
<Midl>
@@ -258,7 +254,7 @@ bld_ml32.bat</Command>
</Midl>
<ClCompile>
<InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
<AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<AdditionalIncludeDirectories>..\..\..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<StringPooling>true</StringPooling>
<ExceptionHandling>
@@ -306,8 +302,8 @@ bld_ml32.bat</Command>
</Midl>
<ClCompile>
<InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
<AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;ASMV;ASMINF;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<AdditionalIncludeDirectories>..\..\..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<StringPooling>true</StringPooling>
<ExceptionHandling>
</ExceptionHandling>
@@ -330,7 +326,7 @@ bld_ml32.bat</Command>
</ResourceCompile>
<Link>
<AdditionalOptions>/MACHINE:I386 %(AdditionalOptions)</AdditionalOptions>
<AdditionalDependencies>..\..\masmx86\match686.obj;..\..\masmx86\inffas32.obj;%(AdditionalDependencies)</AdditionalDependencies>
<AdditionalDependencies>%(AdditionalDependencies)</AdditionalDependencies>
<OutputFile>$(OutDir)zlibwapi.dll</OutputFile>
<SuppressStartupBanner>true</SuppressStartupBanner>
<IgnoreAllDefaultLibraries>false</IgnoreAllDefaultLibraries>
@@ -345,10 +341,6 @@ bld_ml32.bat</Command>
<ImportLibrary>$(OutDir)zlibwapi.lib</ImportLibrary>
<ImageHasSafeExceptionHandlers>false</ImageHasSafeExceptionHandlers>
</Link>
<PreBuildEvent>
<Command>cd ..\..\masmx86
bld_ml32.bat</Command>
</PreBuildEvent>
</ItemDefinitionGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
<Midl>
@@ -360,8 +352,8 @@ bld_ml32.bat</Command>
</Midl>
<ClCompile>
<Optimization>Disabled</Optimization>
<AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;ASMV;ASMINF;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<AdditionalIncludeDirectories>..\..\..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<ExceptionHandling>
</ExceptionHandling>
<RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
@@ -381,7 +373,7 @@ bld_ml32.bat</Command>
<Culture>0x040c</Culture>
</ResourceCompile>
<Link>
<AdditionalDependencies>..\..\masmx64\gvmat64.obj;..\..\masmx64\inffasx64.obj;%(AdditionalDependencies)</AdditionalDependencies>
<AdditionalDependencies>%(AdditionalDependencies)</AdditionalDependencies>
<OutputFile>$(OutDir)zlibwapi.dll</OutputFile>
<SuppressStartupBanner>true</SuppressStartupBanner>
<ModuleDefinitionFile>.\zlibvc.def</ModuleDefinitionFile>
@@ -393,10 +385,6 @@ bld_ml32.bat</Command>
<ImportLibrary>$(OutDir)zlibwapi.lib</ImportLibrary>
<TargetMachine>MachineX64</TargetMachine>
</Link>
<PreBuildEvent>
<Command>cd ..\..\contrib\masmx64
bld_ml64.bat</Command>
</PreBuildEvent>
</ItemDefinitionGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Itanium'">
<Midl>
@@ -408,7 +396,7 @@ bld_ml64.bat</Command>
</Midl>
<ClCompile>
<Optimization>Disabled</Optimization>
<AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<AdditionalIncludeDirectories>..\..\..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<ExceptionHandling>
</ExceptionHandling>
@@ -451,7 +439,7 @@ bld_ml64.bat</Command>
</Midl>
<ClCompile>
<InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
<AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<AdditionalIncludeDirectories>..\..\..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<StringPooling>true</StringPooling>
<ExceptionHandling>
@@ -496,7 +484,7 @@ bld_ml64.bat</Command>
</Midl>
<ClCompile>
<InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
<AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<AdditionalIncludeDirectories>..\..\..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<StringPooling>true</StringPooling>
<ExceptionHandling>
@@ -541,8 +529,8 @@ bld_ml64.bat</Command>
</Midl>
<ClCompile>
<InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
<AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;ASMV;ASMINF;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<AdditionalIncludeDirectories>..\..\..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<StringPooling>true</StringPooling>
<ExceptionHandling>
</ExceptionHandling>
@@ -564,7 +552,7 @@ bld_ml64.bat</Command>
<Culture>0x040c</Culture>
</ResourceCompile>
<Link>
<AdditionalDependencies>..\..\masmx64\gvmat64.obj;..\..\masmx64\inffasx64.obj;%(AdditionalDependencies)</AdditionalDependencies>
<AdditionalDependencies>%(AdditionalDependencies)</AdditionalDependencies>
<OutputFile>$(OutDir)zlibwapi.dll</OutputFile>
<SuppressStartupBanner>true</SuppressStartupBanner>
<IgnoreAllDefaultLibraries>false</IgnoreAllDefaultLibraries>
@@ -576,10 +564,6 @@ bld_ml64.bat</Command>
<ImportLibrary>$(OutDir)zlibwapi.lib</ImportLibrary>
<TargetMachine>MachineX64</TargetMachine>
</Link>
<PreBuildEvent>
<Command>cd ..\..\masmx64
bld_ml64.bat</Command>
</PreBuildEvent>
</ItemDefinitionGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Itanium'">
<Midl>
@@ -591,7 +575,7 @@ bld_ml64.bat</Command>
</Midl>
<ClCompile>
<InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
<AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<AdditionalIncludeDirectories>..\..\..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<StringPooling>true</StringPooling>
<ExceptionHandling>
@@ -636,14 +620,6 @@ bld_ml64.bat</Command>
<ClCompile Include="..\..\..\gzread.c" />
<ClCompile Include="..\..\..\gzwrite.c" />
<ClCompile Include="..\..\..\infback.c" />
<ClCompile Include="..\..\masmx64\inffas8664.c">
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Itanium'">true</ExcludedFromBuild>
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Itanium'">true</ExcludedFromBuild>
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Win32'">true</ExcludedFromBuild>
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Itanium'">true</ExcludedFromBuild>
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
</ClCompile>
<ClCompile Include="..\..\..\inffast.c" />
<ClCompile Include="..\..\..\inflate.c" />
<ClCompile Include="..\..\..\inftrees.c" />

2
libz/contrib/vstudio/vc9/miniunz.vcproj
View File

@@ -542,7 +542,7 @@
<Files>
<Filter
Name="Source Files"
Filter="cpp;c;cxx;def;odl;idl;hpj;bat;asm"
Filter="cpp;c;cxx;def;odl;idl;hpj;bat"
>
<File
RelativePath="..\..\minizip\miniunz.c"

2
libz/contrib/vstudio/vc9/minizip.vcproj
View File

@@ -539,7 +539,7 @@
<Files>
<Filter
Name="Source Files"
Filter="cpp;c;cxx;def;odl;idl;hpj;bat;asm"
Filter="cpp;c;cxx;def;odl;idl;hpj;bat"
>
<File
RelativePath="..\..\minizip\minizip.c"

66
libz/contrib/vstudio/vc9/testzlib.vcproj
View File

@@ -48,7 +48,7 @@
Name="VCCLCompilerTool"
Optimization="0"
AdditionalIncludeDirectories="..\..\.."
PreprocessorDefinitions="ASMV;ASMINF;WIN32;ZLIB_WINAPI;_DEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS"
PreprocessorDefinitions="WIN32;ZLIB_WINAPI;_DEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS"
MinimalRebuild="true"
BasicRuntimeChecks="0"
RuntimeLibrary="1"
@@ -71,7 +71,6 @@
/>
<Tool
Name="VCLinkerTool"
AdditionalDependencies="..\..\masmx86\match686.obj ..\..\masmx86\inffas32.obj"
OutputFile="$(OutDir)/testzlib.exe"
LinkIncremental="2"
GenerateManifest="false"
@@ -128,7 +127,7 @@
<Tool
Name="VCCLCompilerTool"
AdditionalIncludeDirectories="..\..\.."
PreprocessorDefinitions="ASMV;ASMINF;WIN32;ZLIB_WINAPI;_DEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS"
PreprocessorDefinitions="WIN32;ZLIB_WINAPI;_DEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS"
BasicRuntimeChecks="0"
RuntimeLibrary="3"
BufferSecurityCheck="false"
@@ -145,7 +144,6 @@
/>
<Tool
Name="VCLinkerTool"
AdditionalDependencies="..\..\masmx64\gvmat64.obj ..\..\masmx64\inffasx64.obj"
GenerateManifest="false"
/>
<Tool
@@ -517,7 +515,7 @@
InlineFunctionExpansion="1"
OmitFramePointers="true"
AdditionalIncludeDirectories="..\..\.."
PreprocessorDefinitions="ASMV;ASMINF;WIN32;ZLIB_WINAPI;NDEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS"
PreprocessorDefinitions="WIN32;ZLIB_WINAPI;NDEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS"
StringPooling="true"
BasicRuntimeChecks="0"
RuntimeLibrary="0"
@@ -540,7 +538,6 @@
/>
<Tool
Name="VCLinkerTool"
AdditionalDependencies="..\..\masmx86\match686.obj ..\..\masmx86\inffas32.obj"
OutputFile="$(OutDir)/testzlib.exe"
LinkIncremental="1"
GenerateManifest="false"
@@ -600,7 +597,7 @@
<Tool
Name="VCCLCompilerTool"
AdditionalIncludeDirectories="..\..\.."
PreprocessorDefinitions="ASMV;ASMINF;WIN32;ZLIB_WINAPI;NDEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS"
PreprocessorDefinitions="WIN32;ZLIB_WINAPI;NDEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS"
BasicRuntimeChecks="0"
RuntimeLibrary="0"
BufferSecurityCheck="false"
@@ -617,7 +614,6 @@
/>
<Tool
Name="VCLinkerTool"
AdditionalDependencies="..\..\masmx64\gvmat64.obj ..\..\masmx64\inffasx64.obj"
GenerateManifest="false"
/>
<Tool
@@ -733,7 +729,7 @@
<Files>
<Filter
Name="Source Files"
Filter="cpp;c;cxx;def;odl;idl;hpj;bat;asm"
Filter="cpp;c;cxx;def;odl;idl;hpj;bat"
>
<File
RelativePath="..\..\..\adler32.c"
@@ -755,58 +751,6 @@
RelativePath="..\..\..\infback.c"
>
</File>
<File
RelativePath="..\..\masmx64\inffas8664.c"
>
<FileConfiguration
Name="Debug|Win32"
ExcludedFromBuild="true"
>
<Tool
Name="VCCLCompilerTool"
/>
</FileConfiguration>
<FileConfiguration
Name="Debug|Itanium"
ExcludedFromBuild="true"
>
<Tool
Name="VCCLCompilerTool"
/>
</FileConfiguration>
<FileConfiguration
Name="ReleaseWithoutAsm|Win32"
ExcludedFromBuild="true"
>
<Tool
Name="VCCLCompilerTool"
/>
</FileConfiguration>
<FileConfiguration
Name="ReleaseWithoutAsm|Itanium"
ExcludedFromBuild="true"
>
<Tool
Name="VCCLCompilerTool"
/>
</FileConfiguration>
<FileConfiguration
Name="Release|Win32"
ExcludedFromBuild="true"
>
<Tool
Name="VCCLCompilerTool"
/>
</FileConfiguration>
<FileConfiguration
Name="Release|Itanium"
ExcludedFromBuild="true"
>
<Tool
Name="VCCLCompilerTool"
/>
</FileConfiguration>
</File>
<File
RelativePath="..\..\..\inffast.c"
>

2
libz/contrib/vstudio/vc9/testzlibdll.vcproj
View File

@@ -542,7 +542,7 @@
<Files>
<Filter
Name="Source Files"
Filter="cpp;c;cxx;def;odl;idl;hpj;bat;asm"
Filter="cpp;c;cxx;def;odl;idl;hpj;bat"
>
<File
RelativePath="..\..\testzlib\testzlib.c"

6
libz/contrib/vstudio/vc9/zlib.rc
View File

@@ -2,8 +2,8 @@
#define IDR_VERSION1 1
IDR_VERSION1 VERSIONINFO MOVEABLE IMPURE LOADONCALL DISCARDABLE
FILEVERSION 1, 2, 12, 0
PRODUCTVERSION 1, 2, 12, 0
FILEVERSION 1, 2, 13, 0
PRODUCTVERSION 1, 2, 13, 0
FILEFLAGSMASK VS_FFI_FILEFLAGSMASK
FILEFLAGS 0
FILEOS VOS_DOS_WINDOWS32
@@ -17,7 +17,7 @@ BEGIN
BEGIN
VALUE "FileDescription", "zlib data compression and ZIP file I/O library\0"
VALUE "FileVersion", "1.2.12\0"
VALUE "FileVersion", "1.2.13\0"
VALUE "InternalName", "zlib\0"
VALUE "OriginalFilename", "zlibwapi.dll\0"
VALUE "ProductName", "ZLib.DLL\0"

76
libz/contrib/vstudio/vc9/zlibstat.vcproj
View File

@@ -47,7 +47,7 @@
<Tool
Name="VCCLCompilerTool"
Optimization="0"
AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
AdditionalIncludeDirectories="..\..\.."
PreprocessorDefinitions="WIN32;ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS"
ExceptionHandling="0"
RuntimeLibrary="1"
@@ -121,7 +121,7 @@
<Tool
Name="VCCLCompilerTool"
Optimization="0"
AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
AdditionalIncludeDirectories="..\..\.."
PreprocessorDefinitions="ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64"
ExceptionHandling="0"
RuntimeLibrary="3"
@@ -195,7 +195,7 @@
<Tool
Name="VCCLCompilerTool"
Optimization="0"
AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
AdditionalIncludeDirectories="..\..\.."
PreprocessorDefinitions="ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64"
ExceptionHandling="0"
RuntimeLibrary="3"
@@ -268,8 +268,8 @@
<Tool
Name="VCCLCompilerTool"
InlineFunctionExpansion="1"
AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
PreprocessorDefinitions="WIN32;ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ASMV;ASMINF"
AdditionalIncludeDirectories="..\..\.."
PreprocessorDefinitions="WIN32;ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS"
StringPooling="true"
ExceptionHandling="0"
RuntimeLibrary="0"
@@ -295,7 +295,6 @@
<Tool
Name="VCLibrarianTool"
AdditionalOptions="/MACHINE:X86 /NODEFAULTLIB"
AdditionalDependencies="..\..\masmx86\match686.obj ..\..\masmx86\inffas32.obj "
OutputFile="$(OutDir)\zlibstat.lib"
SuppressStartupBanner="true"
/>
@@ -343,8 +342,8 @@
<Tool
Name="VCCLCompilerTool"
InlineFunctionExpansion="1"
AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
PreprocessorDefinitions="ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ASMV;ASMINF;WIN64"
AdditionalIncludeDirectories="..\..\.."
PreprocessorDefinitions="ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64"
StringPooling="true"
ExceptionHandling="0"
RuntimeLibrary="2"
@@ -370,7 +369,6 @@
<Tool
Name="VCLibrarianTool"
AdditionalOptions="/MACHINE:AMD64 /NODEFAULTLIB"
AdditionalDependencies="..\..\masmx64\gvmat64.obj ..\..\masmx64\inffasx64.obj "
OutputFile="$(OutDir)\zlibstat.lib"
SuppressStartupBanner="true"
/>
@@ -418,7 +416,7 @@
<Tool
Name="VCCLCompilerTool"
InlineFunctionExpansion="1"
AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
AdditionalIncludeDirectories="..\..\.."
PreprocessorDefinitions="ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64"
StringPooling="true"
ExceptionHandling="0"
@@ -491,7 +489,7 @@
<Tool
Name="VCCLCompilerTool"
InlineFunctionExpansion="1"
AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
AdditionalIncludeDirectories="..\..\.."
PreprocessorDefinitions="WIN32;ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS"
StringPooling="true"
ExceptionHandling="0"
@@ -565,7 +563,7 @@
<Tool
Name="VCCLCompilerTool"
InlineFunctionExpansion="1"
AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
AdditionalIncludeDirectories="..\..\.."
PreprocessorDefinitions="ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64"
StringPooling="true"
ExceptionHandling="0"
@@ -639,7 +637,7 @@
<Tool
Name="VCCLCompilerTool"
InlineFunctionExpansion="1"
AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
AdditionalIncludeDirectories="..\..\.."
PreprocessorDefinitions="ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64"
StringPooling="true"
ExceptionHandling="0"
@@ -732,58 +730,6 @@
RelativePath="..\..\..\infback.c"
>
</File>
<File
RelativePath="..\..\masmx64\inffas8664.c"
>
<FileConfiguration
Name="Debug|Win32"
ExcludedFromBuild="true"
>
<Tool
Name="VCCLCompilerTool"
/>
</FileConfiguration>
<FileConfiguration
Name="Debug|Itanium"
ExcludedFromBuild="true"
>
<Tool
Name="VCCLCompilerTool"
/>
</FileConfiguration>
<FileConfiguration
Name="Release|Win32"
ExcludedFromBuild="true"
>
<Tool
Name="VCCLCompilerTool"
/>
</FileConfiguration>
<FileConfiguration
Name="Release|Itanium"
ExcludedFromBuild="true"
>
<Tool
Name="VCCLCompilerTool"
/>
</FileConfiguration>
<FileConfiguration
Name="ReleaseWithoutAsm|Win32"
ExcludedFromBuild="true"
>
<Tool
Name="VCCLCompilerTool"
/>
</FileConfiguration>
<FileConfiguration
Name="ReleaseWithoutAsm|Itanium"
ExcludedFromBuild="true"
>
<Tool
Name="VCCLCompilerTool"
/>
</FileConfiguration>
</File>
<File
RelativePath="..\..\..\inffast.c"
>

82
libz/contrib/vstudio/vc9/zlibvc.vcproj
View File

@@ -53,8 +53,8 @@
<Tool
Name="VCCLCompilerTool"
Optimization="0"
AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
PreprocessorDefinitions="WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;ASMV;ASMINF"
AdditionalIncludeDirectories="..\..\.."
PreprocessorDefinitions="WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI"
ExceptionHandling="0"
RuntimeLibrary="1"
BufferSecurityCheck="false"
@@ -81,7 +81,6 @@
<Tool
Name="VCLinkerTool"
AdditionalOptions="/MACHINE:I386"
AdditionalDependencies="..\..\masmx86\match686.obj ..\..\masmx86\inffas32.obj"
OutputFile="$(OutDir)\zlibwapi.dll"
LinkIncremental="2"
SuppressStartupBanner="true"
@@ -150,8 +149,8 @@
<Tool
Name="VCCLCompilerTool"
Optimization="0"
AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
PreprocessorDefinitions="WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;ASMV;ASMINF;WIN64"
AdditionalIncludeDirectories="..\..\.."
PreprocessorDefinitions="WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;WIN64"
ExceptionHandling="0"
RuntimeLibrary="3"
BufferSecurityCheck="false"
@@ -177,7 +176,6 @@
/>
<Tool
Name="VCLinkerTool"
AdditionalDependencies="..\..\masmx64\gvmat64.obj ..\..\masmx64\inffasx64.obj "
OutputFile="$(OutDir)\zlibwapi.dll"
LinkIncremental="2"
SuppressStartupBanner="true"
@@ -245,7 +243,7 @@
<Tool
Name="VCCLCompilerTool"
Optimization="0"
AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
AdditionalIncludeDirectories="..\..\.."
PreprocessorDefinitions="WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;WIN64"
ExceptionHandling="0"
RuntimeLibrary="3"
@@ -340,7 +338,7 @@
<Tool
Name="VCCLCompilerTool"
InlineFunctionExpansion="1"
AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
AdditionalIncludeDirectories="..\..\.."
PreprocessorDefinitions="WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI"
StringPooling="true"
ExceptionHandling="0"
@@ -440,7 +438,7 @@
<Tool
Name="VCCLCompilerTool"
InlineFunctionExpansion="1"
AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
AdditionalIncludeDirectories="..\..\.."
PreprocessorDefinitions="WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;WIN64"
StringPooling="true"
ExceptionHandling="0"
@@ -538,7 +536,7 @@
<Tool
Name="VCCLCompilerTool"
InlineFunctionExpansion="1"
AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
AdditionalIncludeDirectories="..\..\.."
PreprocessorDefinitions="WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;WIN64"
StringPooling="true"
ExceptionHandling="0"
@@ -636,8 +634,8 @@
<Tool
Name="VCCLCompilerTool"
InlineFunctionExpansion="1"
AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
PreprocessorDefinitions="WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;ASMV;ASMINF"
AdditionalIncludeDirectories="..\..\.."
PreprocessorDefinitions="WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI"
StringPooling="true"
ExceptionHandling="0"
RuntimeLibrary="0"
@@ -666,7 +664,6 @@
<Tool
Name="VCLinkerTool"
AdditionalOptions="/MACHINE:I386"
AdditionalDependencies="..\..\masmx86\match686.obj ..\..\masmx86\inffas32.obj "
OutputFile="$(OutDir)\zlibwapi.dll"
LinkIncremental="1"
SuppressStartupBanner="true"
@@ -737,8 +734,8 @@
<Tool
Name="VCCLCompilerTool"
InlineFunctionExpansion="1"
AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
PreprocessorDefinitions="_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;ASMV;ASMINF;WIN64"
AdditionalIncludeDirectories="..\..\.."
PreprocessorDefinitions="_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;WIN64"
StringPooling="true"
ExceptionHandling="0"
RuntimeLibrary="2"
@@ -766,7 +763,6 @@
/>
<Tool
Name="VCLinkerTool"
AdditionalDependencies="..\..\masmx64\gvmat64.obj ..\..\masmx64\inffasx64.obj "
OutputFile="$(OutDir)\zlibwapi.dll"
LinkIncremental="1"
SuppressStartupBanner="true"
@@ -836,7 +832,7 @@
<Tool
Name="VCCLCompilerTool"
InlineFunctionExpansion="1"
AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
AdditionalIncludeDirectories="..\..\.."
PreprocessorDefinitions="_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;WIN64"
StringPooling="true"
ExceptionHandling="0"
@@ -949,58 +945,6 @@
RelativePath="..\..\..\infback.c"
>
</File>
<File
RelativePath="..\..\masmx64\inffas8664.c"
>
<FileConfiguration
Name="Debug|Win32"
ExcludedFromBuild="true"
>
<Tool
Name="VCCLCompilerTool"
/>
</FileConfiguration>
<FileConfiguration
Name="Debug|Itanium"
ExcludedFromBuild="true"
>
<Tool
Name="VCCLCompilerTool"
/>
</FileConfiguration>
<FileConfiguration
Name="ReleaseWithoutAsm|Win32"
ExcludedFromBuild="true"
>
<Tool
Name="VCCLCompilerTool"
/>
</FileConfiguration>
<FileConfiguration
Name="ReleaseWithoutAsm|Itanium"
ExcludedFromBuild="true"
>
<Tool
Name="VCCLCompilerTool"
/>
</FileConfiguration>
<FileConfiguration
Name="Release|Win32"
ExcludedFromBuild="true"
>
<Tool
Name="VCCLCompilerTool"
/>
</FileConfiguration>
<FileConfiguration
Name="Release|Itanium"
ExcludedFromBuild="true"
>
<Tool
Name="VCCLCompilerTool"
/>
</FileConfiguration>
</File>
<File
RelativePath="..\..\..\inffast.c"
>

31
libz/crc32.c
View File

@@ -98,13 +98,22 @@
# endif
#endif
/* If available, use the ARM processor CRC32 instruction. */
#if defined(__aarch64__) && defined(__ARM_FEATURE_CRC32) && W == 8
# define ARMCRC32
#endif
/* Local functions. */
local z_crc_t multmodp OF((z_crc_t a, z_crc_t b));
local z_crc_t x2nmodp OF((z_off64_t n, unsigned k));
/* If available, use the ARM processor CRC32 instruction. */
#if defined(__aarch64__) && defined(__ARM_FEATURE_CRC32) && W == 8
# define ARMCRC32
#if defined(W) && (!defined(ARMCRC32) || defined(DYNAMIC_CRC_TABLE))
local z_word_t byte_swap OF((z_word_t word));
#endif
#if defined(W) && !defined(ARMCRC32)
local z_crc_t crc_word OF((z_word_t data));
local z_word_t crc_word_big OF((z_word_t data));
#endif
#if defined(W) && (!defined(ARMCRC32) || defined(DYNAMIC_CRC_TABLE))
@@ -630,7 +639,7 @@ unsigned long ZEXPORT crc32_z(crc, buf, len)
#endif /* DYNAMIC_CRC_TABLE */
/* Pre-condition the CRC */
crc ^= 0xffffffff;
crc = (~crc) & 0xffffffff;
/* Compute the CRC up to a word boundary. */
while (len && ((z_size_t)buf & 7) != 0) {
@@ -645,8 +654,8 @@ unsigned long ZEXPORT crc32_z(crc, buf, len)
len &= 7;
/* Do three interleaved CRCs to realize the throughput of one crc32x
instruction per cycle. Each CRC is calcuated on Z_BATCH words. The three
CRCs are combined into a single CRC after each set of batches. */
instruction per cycle. Each CRC is calculated on Z_BATCH words. The
three CRCs are combined into a single CRC after each set of batches. */
while (num >= 3 * Z_BATCH) {
crc1 = 0;
crc2 = 0;
@@ -749,7 +758,7 @@ unsigned long ZEXPORT crc32_z(crc, buf, len)
#endif /* DYNAMIC_CRC_TABLE */
/* Pre-condition the CRC */
crc ^= 0xffffffff;
crc = (~crc) & 0xffffffff;
#ifdef W
@@ -1077,7 +1086,7 @@ uLong ZEXPORT crc32_combine64(crc1, crc2, len2)
#ifdef DYNAMIC_CRC_TABLE
once(&made, make_crc_table);
#endif /* DYNAMIC_CRC_TABLE */
return multmodp(x2nmodp(len2, 3), crc1) ^ crc2;
return multmodp(x2nmodp(len2, 3), crc1) ^ (crc2 & 0xffffffff);
}
/* ========================================================================= */
@@ -1086,7 +1095,7 @@ uLong ZEXPORT crc32_combine(crc1, crc2, len2)
uLong crc2;
z_off_t len2;
{
return crc32_combine64(crc1, crc2, (z_off64_t) len2);
return crc32_combine64(crc1, crc2, (z_off64_t)len2);
}
/* ========================================================================= */
@@ -1103,7 +1112,7 @@ uLong ZEXPORT crc32_combine_gen64(len2)
uLong ZEXPORT crc32_combine_gen(len2)
z_off_t len2;
{
return crc32_combine_gen64((z_off64_t) len2);
return crc32_combine_gen64((z_off64_t)len2);
}
/* ========================================================================= */
@@ -1112,5 +1121,5 @@ uLong ZEXPORT crc32_combine_op(crc1, crc2, op)
uLong crc2;
uLong op;
{
return multmodp(op, crc1) ^ crc2;
return multmodp(op, crc1) ^ (crc2 & 0xffffffff);
}

218
libz/deflate.c
View File

@@ -52,7 +52,7 @@
#include "deflate.h"
const char deflate_copyright[] =
" deflate 1.2.12 Copyright 1995-2022 Jean-loup Gailly and Mark Adler ";
" deflate 1.2.13 Copyright 1995-2022 Jean-loup Gailly and Mark Adler ";
/*
If you use the zlib library in a product, an acknowledgment is welcome
in the documentation of your product. If for some reason you cannot
@@ -87,13 +87,7 @@ local void lm_init OF((deflate_state *s));
local void putShortMSB OF((deflate_state *s, uInt b));
local void flush_pending OF((z_streamp strm));
local unsigned read_buf OF((z_streamp strm, Bytef *buf, unsigned size));
#ifdef ASMV
# pragma message("Assembler code may have bugs -- use at your own risk")
void match_init OF((void)); /* asm code initialization */
uInt longest_match OF((deflate_state *s, IPos cur_match));
#else
local uInt longest_match OF((deflate_state *s, IPos cur_match));
#endif
#ifdef ZLIB_DEBUG
local void check_match OF((deflate_state *s, IPos start, IPos match,
@@ -160,7 +154,7 @@ local const config configuration_table[10] = {
* characters, so that a running hash key can be computed from the previous
* key instead of complete recalculation each time.
*/
#define UPDATE_HASH(s,h,c) (h = (((h)<<s->hash_shift) ^ (c)) & s->hash_mask)
#define UPDATE_HASH(s,h,c) (h = (((h) << s->hash_shift) ^ (c)) & s->hash_mask)
/* ===========================================================================
@@ -191,9 +185,9 @@ local const config configuration_table[10] = {
*/
#define CLEAR_HASH(s) \
do { \
s->head[s->hash_size-1] = NIL; \
s->head[s->hash_size - 1] = NIL; \
zmemzero((Bytef *)s->head, \
(unsigned)(s->hash_size-1)*sizeof(*s->head)); \
(unsigned)(s->hash_size - 1)*sizeof(*s->head)); \
} while (0)
/* ===========================================================================
@@ -285,6 +279,8 @@ int ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
if (windowBits < 0) { /* suppress zlib wrapper */
wrap = 0;
if (windowBits < -15)
return Z_STREAM_ERROR;
windowBits = -windowBits;
}
#ifdef GZIP
@@ -314,7 +310,7 @@ int ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
s->hash_bits = (uInt)memLevel + 7;
s->hash_size = 1 << s->hash_bits;
s->hash_mask = s->hash_size - 1;
s->hash_shift = ((s->hash_bits+MIN_MATCH-1)/MIN_MATCH);
s->hash_shift = ((s->hash_bits + MIN_MATCH-1) / MIN_MATCH);
s->window = (Bytef *) ZALLOC(strm, s->w_size, 2*sizeof(Byte));
s->prev = (Posf *) ZALLOC(strm, s->w_size, sizeof(Pos));
@@ -340,11 +336,11 @@ int ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
* sym_buf value to read moves forward three bytes. From that symbol, up to
* 31 bits are written to pending_buf. The closest the written pending_buf
* bits gets to the next sym_buf symbol to read is just before the last
* code is written. At that time, 31*(n-2) bits have been written, just
* after 24*(n-2) bits have been consumed from sym_buf. sym_buf starts at
* 8*n bits into pending_buf. (Note that the symbol buffer fills when n-1
* code is written. At that time, 31*(n - 2) bits have been written, just
* after 24*(n - 2) bits have been consumed from sym_buf. sym_buf starts at
* 8*n bits into pending_buf. (Note that the symbol buffer fills when n - 1
* symbols are written.) The closest the writing gets to what is unread is
* then n+14 bits. Here n is lit_bufsize, which is 16384 by default, and
* then n + 14 bits. Here n is lit_bufsize, which is 16384 by default, and
* can range from 128 to 32768.
*
* Therefore, at a minimum, there are 142 bits of space between what is
@@ -390,7 +386,7 @@ int ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
/* =========================================================================
* Check for a valid deflate stream state. Return 0 if ok, 1 if not.
*/
local int deflateStateCheck (strm)
local int deflateStateCheck(strm)
z_streamp strm;
{
deflate_state *s;
@@ -413,7 +409,7 @@ local int deflateStateCheck (strm)
}
/* ========================================================================= */
int ZEXPORT deflateSetDictionary (strm, dictionary, dictLength)
int ZEXPORT deflateSetDictionary(strm, dictionary, dictLength)
z_streamp strm;
const Bytef *dictionary;
uInt dictLength;
@@ -482,7 +478,7 @@ int ZEXPORT deflateSetDictionary (strm, dictionary, dictLength)
}
/* ========================================================================= */
int ZEXPORT deflateGetDictionary (strm, dictionary, dictLength)
int ZEXPORT deflateGetDictionary(strm, dictionary, dictLength)
z_streamp strm;
Bytef *dictionary;
uInt *dictLength;
@@ -504,7 +500,7 @@ int ZEXPORT deflateGetDictionary (strm, dictionary, dictLength)
}
/* ========================================================================= */
int ZEXPORT deflateResetKeep (strm)
int ZEXPORT deflateResetKeep(strm)
z_streamp strm;
{
deflate_state *s;
@@ -542,7 +538,7 @@ int ZEXPORT deflateResetKeep (strm)
}
/* ========================================================================= */
int ZEXPORT deflateReset (strm)
int ZEXPORT deflateReset(strm)
z_streamp strm;
{
int ret;
@@ -554,7 +550,7 @@ int ZEXPORT deflateReset (strm)
}
/* ========================================================================= */
int ZEXPORT deflateSetHeader (strm, head)
int ZEXPORT deflateSetHeader(strm, head)
z_streamp strm;
gz_headerp head;
{
@@ -565,7 +561,7 @@ int ZEXPORT deflateSetHeader (strm, head)
}
/* ========================================================================= */
int ZEXPORT deflatePending (strm, pending, bits)
int ZEXPORT deflatePending(strm, pending, bits)
unsigned *pending;
int *bits;
z_streamp strm;
@@ -579,7 +575,7 @@ int ZEXPORT deflatePending (strm, pending, bits)
}
/* ========================================================================= */
int ZEXPORT deflatePrime (strm, bits, value)
int ZEXPORT deflatePrime(strm, bits, value)
z_streamp strm;
int bits;
int value;
@@ -674,36 +670,50 @@ int ZEXPORT deflateTune(strm, good_length, max_lazy, nice_length, max_chain)
}
/* =========================================================================
* For the default windowBits of 15 and memLevel of 8, this function returns
* a close to exact, as well as small, upper bound on the compressed size.
* They are coded as constants here for a reason--if the #define's are
* changed, then this function needs to be changed as well. The return
* value for 15 and 8 only works for those exact settings.
* For the default windowBits of 15 and memLevel of 8, this function returns a
* close to exact, as well as small, upper bound on the compressed size. This
* is an expansion of ~0.03%, plus a small constant.
*
* For any setting other than those defaults for windowBits and memLevel,
* the value returned is a conservative worst case for the maximum expansion
* resulting from using fixed blocks instead of stored blocks, which deflate
* can emit on compressed data for some combinations of the parameters.
* For any setting other than those defaults for windowBits and memLevel, one
* of two worst case bounds is returned. This is at most an expansion of ~4% or
* ~13%, plus a small constant.
*
* This function could be more sophisticated to provide closer upper bounds for
* every combination of windowBits and memLevel. But even the conservative
* upper bound of about 14% expansion does not seem onerous for output buffer
* allocation.
* Both the 0.03% and 4% derive from the overhead of stored blocks. The first
* one is for stored blocks of 16383 bytes (memLevel == 8), whereas the second
* is for stored blocks of 127 bytes (the worst case memLevel == 1). The
* expansion results from five bytes of header for each stored block.
*
* The larger expansion of 13% results from a window size less than or equal to
* the symbols buffer size (windowBits <= memLevel + 7). In that case some of
* the data being compressed may have slid out of the sliding window, impeding
* a stored block from being emitted. Then the only choice is a fixed or
* dynamic block, where a fixed block limits the maximum expansion to 9 bits
* per 8-bit byte, plus 10 bits for every block. The smallest block size for
* which this can occur is 255 (memLevel == 2).
*
* Shifts are used to approximate divisions, for speed.
*/
uLong ZEXPORT deflateBound(strm, sourceLen)
z_streamp strm;
uLong sourceLen;
{
deflate_state *s;
uLong complen, wraplen;
uLong fixedlen, storelen, wraplen;
/* conservative upper bound for compressed data */
complen = sourceLen +
((sourceLen + 7) >> 3) + ((sourceLen + 63) >> 6) + 5;
/* upper bound for fixed blocks with 9-bit literals and length 255
(memLevel == 2, which is the lowest that may not use stored blocks) --
~13% overhead plus a small constant */
fixedlen = sourceLen + (sourceLen >> 3) + (sourceLen >> 8) +
(sourceLen >> 9) + 4;
/* if can't get parameters, return conservative bound plus zlib wrapper */
/* upper bound for stored blocks with length 127 (memLevel == 1) --
~4% overhead plus a small constant */
storelen = sourceLen + (sourceLen >> 5) + (sourceLen >> 7) +
(sourceLen >> 11) + 7;
/* if can't get parameters, return larger bound plus a zlib wrapper */
if (deflateStateCheck(strm))
return complen + 6;
return (fixedlen > storelen ? fixedlen : storelen) + 6;
/* compute wrapper length */
s = strm->state;
@@ -740,11 +750,12 @@ uLong ZEXPORT deflateBound(strm, sourceLen)
wraplen = 6;
}
/* if not default parameters, return conservative bound */
/* if not default parameters, return one of the conservative bounds */
if (s->w_bits != 15 || s->hash_bits != 8 + 7)
return complen + wraplen;
return (s->w_bits <= s->hash_bits ? fixedlen : storelen) + wraplen;
/* default settings: return tight bound for that case */
/* default settings: return tight bound for that case -- ~0.03% overhead
plus a small constant */
return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) +
(sourceLen >> 25) + 13 - 6 + wraplen;
}
@@ -754,7 +765,7 @@ uLong ZEXPORT deflateBound(strm, sourceLen)
* IN assertion: the stream state is correct and there is enough room in
* pending_buf.
*/
local void putShortMSB (s, b)
local void putShortMSB(s, b)
deflate_state *s;
uInt b;
{
@@ -801,7 +812,7 @@ local void flush_pending(strm)
} while (0)
/* ========================================================================= */
int ZEXPORT deflate (strm, flush)
int ZEXPORT deflate(strm, flush)
z_streamp strm;
int flush;
{
@@ -856,7 +867,7 @@ int ZEXPORT deflate (strm, flush)
s->status = BUSY_STATE;
if (s->status == INIT_STATE) {
/* zlib header */
uInt header = (Z_DEFLATED + ((s->w_bits-8)<<4)) << 8;
uInt header = (Z_DEFLATED + ((s->w_bits - 8) << 4)) << 8;
uInt level_flags;
if (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2)
@@ -1116,7 +1127,7 @@ int ZEXPORT deflate (strm, flush)
}
/* ========================================================================= */
int ZEXPORT deflateEnd (strm)
int ZEXPORT deflateEnd(strm)
z_streamp strm;
{
int status;
@@ -1142,7 +1153,7 @@ int ZEXPORT deflateEnd (strm)
* To simplify the source, this is not supported for 16-bit MSDOS (which
* doesn't have enough memory anyway to duplicate compression states).
*/
int ZEXPORT deflateCopy (dest, source)
int ZEXPORT deflateCopy(dest, source)
z_streamp dest;
z_streamp source;
{
@@ -1231,7 +1242,7 @@ local unsigned read_buf(strm, buf, size)
/* ===========================================================================
* Initialize the "longest match" routines for a new zlib stream
*/
local void lm_init (s)
local void lm_init(s)
deflate_state *s;
{
s->window_size = (ulg)2L*s->w_size;
@@ -1252,11 +1263,6 @@ local void lm_init (s)
s->match_length = s->prev_length = MIN_MATCH-1;
s->match_available = 0;
s->ins_h = 0;
#ifndef FASTEST
#ifdef ASMV
match_init(); /* initialize the asm code */
#endif
#endif
}
#ifndef FASTEST
@@ -1269,10 +1275,6 @@ local void lm_init (s)
* string (strstart) and its distance is <= MAX_DIST, and prev_length >= 1
* OUT assertion: the match length is not greater than s->lookahead.
*/
#ifndef ASMV
/* For 80x86 and 680x0, an optimized version will be provided in match.asm or
* match.S. The code will be functionally equivalent.
*/
local uInt longest_match(s, cur_match)
deflate_state *s;
IPos cur_match; /* current match */
@@ -1297,10 +1299,10 @@ local uInt longest_match(s, cur_match)
*/
register Bytef *strend = s->window + s->strstart + MAX_MATCH - 1;
register ush scan_start = *(ushf*)scan;
register ush scan_end = *(ushf*)(scan+best_len-1);
register ush scan_end = *(ushf*)(scan + best_len - 1);
#else
register Bytef *strend = s->window + s->strstart + MAX_MATCH;
register Byte scan_end1 = scan[best_len-1];
register Byte scan_end1 = scan[best_len - 1];
register Byte scan_end = scan[best_len];
#endif
@@ -1318,7 +1320,8 @@ local uInt longest_match(s, cur_match)
*/
if ((uInt)nice_match > s->lookahead) nice_match = (int)s->lookahead;
Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead");
Assert((ulg)s->strstart <= s->window_size - MIN_LOOKAHEAD,
"need lookahead");
do {
Assert(cur_match < s->strstart, "no future");
@@ -1336,43 +1339,44 @@ local uInt longest_match(s, cur_match)
/* This code assumes sizeof(unsigned short) == 2. Do not use
* UNALIGNED_OK if your compiler uses a different size.
*/
if (*(ushf*)(match+best_len-1) != scan_end ||
if (*(ushf*)(match + best_len - 1) != scan_end ||
*(ushf*)match != scan_start) continue;
/* It is not necessary to compare scan[2] and match[2] since they are
* always equal when the other bytes match, given that the hash keys
* are equal and that HASH_BITS >= 8. Compare 2 bytes at a time at
* strstart+3, +5, ... up to strstart+257. We check for insufficient
* strstart + 3, + 5, up to strstart + 257. We check for insufficient
* lookahead only every 4th comparison; the 128th check will be made
* at strstart+257. If MAX_MATCH-2 is not a multiple of 8, it is
* at strstart + 257. If MAX_MATCH-2 is not a multiple of 8, it is
* necessary to put more guard bytes at the end of the window, or
* to check more often for insufficient lookahead.
*/
Assert(scan[2] == match[2], "scan[2]?");
scan++, match++;
do {
} while (*(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
*(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
*(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
*(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
} while (*(ushf*)(scan += 2) == *(ushf*)(match += 2) &&
*(ushf*)(scan += 2) == *(ushf*)(match += 2) &&
*(ushf*)(scan += 2) == *(ushf*)(match += 2) &&
*(ushf*)(scan += 2) == *(ushf*)(match += 2) &&
scan < strend);
/* The funny "do {}" generates better code on most compilers */
/* Here, scan <= window+strstart+257 */
Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan");
/* Here, scan <= window + strstart + 257 */
Assert(scan <= s->window + (unsigned)(s->window_size - 1),
"wild scan");
if (*scan == *match) scan++;
len = (MAX_MATCH - 1) - (int)(strend-scan);
len = (MAX_MATCH - 1) - (int)(strend - scan);
scan = strend - (MAX_MATCH-1);
#else /* UNALIGNED_OK */
if (match[best_len] != scan_end ||
match[best_len-1] != scan_end1 ||
*match != *scan ||
*++match != scan[1]) continue;
if (match[best_len] != scan_end ||
match[best_len - 1] != scan_end1 ||
*match != *scan ||
*++match != scan[1]) continue;
/* The check at best_len-1 can be removed because it will be made
/* The check at best_len - 1 can be removed because it will be made
* again later. (This heuristic is not always a win.)
* It is not necessary to compare scan[2] and match[2] since they
* are always equal when the other bytes match, given that
@@ -1382,7 +1386,7 @@ local uInt longest_match(s, cur_match)
Assert(*scan == *match, "match[2]?");
/* We check for insufficient lookahead only every 8th comparison;
* the 256th check will be made at strstart+258.
* the 256th check will be made at strstart + 258.
*/
do {
} while (*++scan == *++match && *++scan == *++match &&
@@ -1391,7 +1395,8 @@ local uInt longest_match(s, cur_match)
*++scan == *++match && *++scan == *++match &&
scan < strend);
Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan");
Assert(scan <= s->window + (unsigned)(s->window_size - 1),
"wild scan");
len = MAX_MATCH - (int)(strend - scan);
scan = strend - MAX_MATCH;
@@ -1403,9 +1408,9 @@ local uInt longest_match(s, cur_match)
best_len = len;
if (len >= nice_match) break;
#ifdef UNALIGNED_OK
scan_end = *(ushf*)(scan+best_len-1);
scan_end = *(ushf*)(scan + best_len - 1);
#else
scan_end1 = scan[best_len-1];
scan_end1 = scan[best_len - 1];
scan_end = scan[best_len];
#endif
}
@@ -1415,7 +1420,6 @@ local uInt longest_match(s, cur_match)
if ((uInt)best_len <= s->lookahead) return (uInt)best_len;
return s->lookahead;
}
#endif /* ASMV */
#else /* FASTEST */
@@ -1436,7 +1440,8 @@ local uInt longest_match(s, cur_match)
*/
Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever");
Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead");
Assert((ulg)s->strstart <= s->window_size - MIN_LOOKAHEAD,
"need lookahead");
Assert(cur_match < s->strstart, "no future");
@@ -1446,7 +1451,7 @@ local uInt longest_match(s, cur_match)
*/
if (match[0] != scan[0] || match[1] != scan[1]) return MIN_MATCH-1;
/* The check at best_len-1 can be removed because it will be made
/* The check at best_len - 1 can be removed because it will be made
* again later. (This heuristic is not always a win.)
* It is not necessary to compare scan[2] and match[2] since they
* are always equal when the other bytes match, given that
@@ -1456,7 +1461,7 @@ local uInt longest_match(s, cur_match)
Assert(*scan == *match, "match[2]?");
/* We check for insufficient lookahead only every 8th comparison;
* the 256th check will be made at strstart+258.
* the 256th check will be made at strstart + 258.
*/
do {
} while (*++scan == *++match && *++scan == *++match &&
@@ -1465,7 +1470,7 @@ local uInt longest_match(s, cur_match)
*++scan == *++match && *++scan == *++match &&
scan < strend);
Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan");
Assert(scan <= s->window + (unsigned)(s->window_size - 1), "wild scan");
len = MAX_MATCH - (int)(strend - scan);
@@ -1501,7 +1506,7 @@ local void check_match(s, start, match, length)
z_error("invalid match");
}
if (z_verbose > 1) {
fprintf(stderr,"\\[%d,%d]", start-match, length);
fprintf(stderr,"\\[%d,%d]", start - match, length);
do { putc(s->window[start++], stderr); } while (--length != 0);
}
}
@@ -1547,9 +1552,9 @@ local void fill_window(s)
/* If the window is almost full and there is insufficient lookahead,
* move the upper half to the lower one to make room in the upper half.
*/
if (s->strstart >= wsize+MAX_DIST(s)) {
if (s->strstart >= wsize + MAX_DIST(s)) {
zmemcpy(s->window, s->window+wsize, (unsigned)wsize - more);
zmemcpy(s->window, s->window + wsize, (unsigned)wsize - more);
s->match_start -= wsize;
s->strstart -= wsize; /* we now have strstart >= MAX_DIST */
s->block_start -= (long) wsize;
@@ -1680,7 +1685,7 @@ local void fill_window(s)
*
* deflate_stored() is written to minimize the number of times an input byte is
* copied. It is most efficient with large input and output buffers, which
* maximizes the opportunites to have a single copy from next_in to next_out.
* maximizes the opportunities to have a single copy from next_in to next_out.
*/
local block_state deflate_stored(s, flush)
deflate_state *s;
@@ -1890,7 +1895,7 @@ local block_state deflate_fast(s, flush)
if (s->lookahead == 0) break; /* flush the current block */
}
/* Insert the string window[strstart .. strstart+2] in the
/* Insert the string window[strstart .. strstart + 2] in the
* dictionary, and set hash_head to the head of the hash chain:
*/
hash_head = NIL;
@@ -1938,7 +1943,7 @@ local block_state deflate_fast(s, flush)
s->strstart += s->match_length;
s->match_length = 0;
s->ins_h = s->window[s->strstart];
UPDATE_HASH(s, s->ins_h, s->window[s->strstart+1]);
UPDATE_HASH(s, s->ins_h, s->window[s->strstart + 1]);
#if MIN_MATCH != 3
Call UPDATE_HASH() MIN_MATCH-3 more times
#endif
@@ -1949,7 +1954,7 @@ local block_state deflate_fast(s, flush)
} else {
/* No match, output a literal byte */
Tracevv((stderr,"%c", s->window[s->strstart]));
_tr_tally_lit (s, s->window[s->strstart], bflush);
_tr_tally_lit(s, s->window[s->strstart], bflush);
s->lookahead--;
s->strstart++;
}
@@ -1993,7 +1998,7 @@ local block_state deflate_slow(s, flush)
if (s->lookahead == 0) break; /* flush the current block */
}
/* Insert the string window[strstart .. strstart+2] in the
/* Insert the string window[strstart .. strstart + 2] in the
* dictionary, and set hash_head to the head of the hash chain:
*/
hash_head = NIL;
@@ -2035,17 +2040,17 @@ local block_state deflate_slow(s, flush)
uInt max_insert = s->strstart + s->lookahead - MIN_MATCH;
/* Do not insert strings in hash table beyond this. */
check_match(s, s->strstart-1, s->prev_match, s->prev_length);
check_match(s, s->strstart - 1, s->prev_match, s->prev_length);
_tr_tally_dist(s, s->strstart -1 - s->prev_match,
_tr_tally_dist(s, s->strstart - 1 - s->prev_match,
s->prev_length - MIN_MATCH, bflush);
/* Insert in hash table all strings up to the end of the match.
* strstart-1 and strstart are already inserted. If there is not
* strstart - 1 and strstart are already inserted. If there is not
* enough lookahead, the last two strings are not inserted in
* the hash table.
*/
s->lookahead -= s->prev_length-1;
s->lookahead -= s->prev_length - 1;
s->prev_length -= 2;
do {
if (++s->strstart <= max_insert) {
@@ -2063,8 +2068,8 @@ local block_state deflate_slow(s, flush)
* single literal. If there was a match but the current match
* is longer, truncate the previous match to a single literal.
*/
Tracevv((stderr,"%c", s->window[s->strstart-1]));
_tr_tally_lit(s, s->window[s->strstart-1], bflush);
Tracevv((stderr,"%c", s->window[s->strstart - 1]));
_tr_tally_lit(s, s->window[s->strstart - 1], bflush);
if (bflush) {
FLUSH_BLOCK_ONLY(s, 0);
}
@@ -2082,8 +2087,8 @@ local block_state deflate_slow(s, flush)
}
Assert (flush != Z_NO_FLUSH, "no flush?");
if (s->match_available) {
Tracevv((stderr,"%c", s->window[s->strstart-1]));
_tr_tally_lit(s, s->window[s->strstart-1], bflush);
Tracevv((stderr,"%c", s->window[s->strstart - 1]));
_tr_tally_lit(s, s->window[s->strstart - 1], bflush);
s->match_available = 0;
}
s->insert = s->strstart < MIN_MATCH-1 ? s->strstart : MIN_MATCH-1;
@@ -2140,7 +2145,8 @@ local block_state deflate_rle(s, flush)
if (s->match_length > s->lookahead)
s->match_length = s->lookahead;
}
Assert(scan <= s->window+(uInt)(s->window_size-1), "wild scan");
Assert(scan <= s->window + (uInt)(s->window_size - 1),
"wild scan");
}
/* Emit match if have run of MIN_MATCH or longer, else emit literal */
@@ -2155,7 +2161,7 @@ local block_state deflate_rle(s, flush)
} else {
/* No match, output a literal byte */
Tracevv((stderr,"%c", s->window[s->strstart]));
_tr_tally_lit (s, s->window[s->strstart], bflush);
_tr_tally_lit(s, s->window[s->strstart], bflush);
s->lookahead--;
s->strstart++;
}
@@ -2195,7 +2201,7 @@ local block_state deflate_huff(s, flush)
/* Output a literal byte */
s->match_length = 0;
Tracevv((stderr,"%c", s->window[s->strstart]));
_tr_tally_lit (s, s->window[s->strstart], bflush);
_tr_tally_lit(s, s->window[s->strstart], bflush);
s->lookahead--;
s->strstart++;
if (bflush) FLUSH_BLOCK(s, 0);

4
libz/deflate.h
View File

@@ -329,8 +329,8 @@ void ZLIB_INTERNAL _tr_stored_block OF((deflate_state *s, charf *buf,
# define _tr_tally_dist(s, distance, length, flush) \
{ uch len = (uch)(length); \
ush dist = (ush)(distance); \
s->sym_buf[s->sym_next++] = dist; \
s->sym_buf[s->sym_next++] = dist >> 8; \
s->sym_buf[s->sym_next++] = (uch)dist; \
s->sym_buf[s->sym_next++] = (uch)(dist >> 8); \
s->sym_buf[s->sym_next++] = len; \
dist--; \
s->dyn_ltree[_length_code[len]+LITERALS+1].Freq++; \

209
libz/doc/algorithm.txt Normal file
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@@ -0,0 +1,209 @@
1. Compression algorithm (deflate)
The deflation algorithm used by gzip (also zip and zlib) is a variation of
LZ77 (Lempel-Ziv 1977, see reference below). It finds duplicated strings in
the input data. The second occurrence of a string is replaced by a
pointer to the previous string, in the form of a pair (distance,
length). Distances are limited to 32K bytes, and lengths are limited
to 258 bytes. When a string does not occur anywhere in the previous
32K bytes, it is emitted as a sequence of literal bytes. (In this
description, `string' must be taken as an arbitrary sequence of bytes,
and is not restricted to printable characters.)
Literals or match lengths are compressed with one Huffman tree, and
match distances are compressed with another tree. The trees are stored
in a compact form at the start of each block. The blocks can have any
size (except that the compressed data for one block must fit in
available memory). A block is terminated when deflate() determines that
it would be useful to start another block with fresh trees. (This is
somewhat similar to the behavior of LZW-based _compress_.)
Duplicated strings are found using a hash table. All input strings of
length 3 are inserted in the hash table. A hash index is computed for
the next 3 bytes. If the hash chain for this index is not empty, all
strings in the chain are compared with the current input string, and
the longest match is selected.
The hash chains are searched starting with the most recent strings, to
favor small distances and thus take advantage of the Huffman encoding.
The hash chains are singly linked. There are no deletions from the
hash chains, the algorithm simply discards matches that are too old.
To avoid a worst-case situation, very long hash chains are arbitrarily
truncated at a certain length, determined by a runtime option (level
parameter of deflateInit). So deflate() does not always find the longest
possible match but generally finds a match which is long enough.
deflate() also defers the selection of matches with a lazy evaluation
mechanism. After a match of length N has been found, deflate() searches for
a longer match at the next input byte. If a longer match is found, the
previous match is truncated to a length of one (thus producing a single
literal byte) and the process of lazy evaluation begins again. Otherwise,
the original match is kept, and the next match search is attempted only N
steps later.
The lazy match evaluation is also subject to a runtime parameter. If
the current match is long enough, deflate() reduces the search for a longer
match, thus speeding up the whole process. If compression ratio is more
important than speed, deflate() attempts a complete second search even if
the first match is already long enough.
The lazy match evaluation is not performed for the fastest compression
modes (level parameter 1 to 3). For these fast modes, new strings
are inserted in the hash table only when no match was found, or
when the match is not too long. This degrades the compression ratio
but saves time since there are both fewer insertions and fewer searches.
2. Decompression algorithm (inflate)
2.1 Introduction
The key question is how to represent a Huffman code (or any prefix code) so
that you can decode fast. The most important characteristic is that shorter
codes are much more common than longer codes, so pay attention to decoding the
short codes fast, and let the long codes take longer to decode.
inflate() sets up a first level table that covers some number of bits of
input less than the length of longest code. It gets that many bits from the
stream, and looks it up in the table. The table will tell if the next
code is that many bits or less and how many, and if it is, it will tell
the value, else it will point to the next level table for which inflate()
grabs more bits and tries to decode a longer code.
How many bits to make the first lookup is a tradeoff between the time it
takes to decode and the time it takes to build the table. If building the
table took no time (and if you had infinite memory), then there would only
be a first level table to cover all the way to the longest code. However,
building the table ends up taking a lot longer for more bits since short
codes are replicated many times in such a table. What inflate() does is
simply to make the number of bits in the first table a variable, and then
to set that variable for the maximum speed.
For inflate, which has 286 possible codes for the literal/length tree, the size
of the first table is nine bits. Also the distance trees have 30 possible
values, and the size of the first table is six bits. Note that for each of
those cases, the table ended up one bit longer than the ``average'' code
length, i.e. the code length of an approximately flat code which would be a
little more than eight bits for 286 symbols and a little less than five bits
for 30 symbols.
2.2 More details on the inflate table lookup
Ok, you want to know what this cleverly obfuscated inflate tree actually
looks like. You are correct that it's not a Huffman tree. It is simply a
lookup table for the first, let's say, nine bits of a Huffman symbol. The
symbol could be as short as one bit or as long as 15 bits. If a particular
symbol is shorter than nine bits, then that symbol's translation is duplicated
in all those entries that start with that symbol's bits. For example, if the
symbol is four bits, then it's duplicated 32 times in a nine-bit table. If a
symbol is nine bits long, it appears in the table once.
If the symbol is longer than nine bits, then that entry in the table points
to another similar table for the remaining bits. Again, there are duplicated
entries as needed. The idea is that most of the time the symbol will be short
and there will only be one table look up. (That's whole idea behind data
compression in the first place.) For the less frequent long symbols, there
will be two lookups. If you had a compression method with really long
symbols, you could have as many levels of lookups as is efficient. For
inflate, two is enough.
So a table entry either points to another table (in which case nine bits in
the above example are gobbled), or it contains the translation for the symbol
and the number of bits to gobble. Then you start again with the next
ungobbled bit.
You may wonder: why not just have one lookup table for how ever many bits the
longest symbol is? The reason is that if you do that, you end up spending
more time filling in duplicate symbol entries than you do actually decoding.
At least for deflate's output that generates new trees every several 10's of
kbytes. You can imagine that filling in a 2^15 entry table for a 15-bit code
would take too long if you're only decoding several thousand symbols. At the
other extreme, you could make a new table for every bit in the code. In fact,
that's essentially a Huffman tree. But then you spend too much time
traversing the tree while decoding, even for short symbols.
So the number of bits for the first lookup table is a trade of the time to
fill out the table vs. the time spent looking at the second level and above of
the table.
Here is an example, scaled down:
The code being decoded, with 10 symbols, from 1 to 6 bits long:
A: 0
B: 10
C: 1100
D: 11010
E: 11011
F: 11100
G: 11101
H: 11110
I: 111110
J: 111111
Let's make the first table three bits long (eight entries):
000: A,1
001: A,1
010: A,1
011: A,1
100: B,2
101: B,2
110: -> table X (gobble 3 bits)
111: -> table Y (gobble 3 bits)
Each entry is what the bits decode as and how many bits that is, i.e. how
many bits to gobble. Or the entry points to another table, with the number of
bits to gobble implicit in the size of the table.
Table X is two bits long since the longest code starting with 110 is five bits
long:
00: C,1
01: C,1
10: D,2
11: E,2
Table Y is three bits long since the longest code starting with 111 is six
bits long:
000: F,2
001: F,2
010: G,2
011: G,2
100: H,2
101: H,2
110: I,3
111: J,3
So what we have here are three tables with a total of 20 entries that had to
be constructed. That's compared to 64 entries for a single table. Or
compared to 16 entries for a Huffman tree (six two entry tables and one four
entry table). Assuming that the code ideally represents the probability of
the symbols, it takes on the average 1.25 lookups per symbol. That's compared
to one lookup for the single table, or 1.66 lookups per symbol for the
Huffman tree.
There, I think that gives you a picture of what's going on. For inflate, the
meaning of a particular symbol is often more than just a letter. It can be a
byte (a "literal"), or it can be either a length or a distance which
indicates a base value and a number of bits to fetch after the code that is
added to the base value. Or it might be the special end-of-block code. The
data structures created in inftrees.c try to encode all that information
compactly in the tables.
Jean-loup Gailly Mark Adler
jloup@gzip.org madler@alumni.caltech.edu
References:
[LZ77] Ziv J., Lempel A., ``A Universal Algorithm for Sequential Data
Compression,'' IEEE Transactions on Information Theory, Vol. 23, No. 3,
pp. 337-343.
``DEFLATE Compressed Data Format Specification'' available in
http://tools.ietf.org/html/rfc1951

619
libz/doc/rfc1950.txt Normal file
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@@ -0,0 +1,619 @@
Network Working Group P. Deutsch
Request for Comments: 1950 Aladdin Enterprises
Category: Informational J-L. Gailly
Info-ZIP
May 1996
ZLIB Compressed Data Format Specification version 3.3
Status of This Memo
This memo provides information for the Internet community. This memo
does not specify an Internet standard of any kind. Distribution of
this memo is unlimited.
IESG Note:
The IESG takes no position on the validity of any Intellectual
Property Rights statements contained in this document.
Notices
Copyright (c) 1996 L. Peter Deutsch and Jean-Loup Gailly
Permission is granted to copy and distribute this document for any
purpose and without charge, including translations into other
languages and incorporation into compilations, provided that the
copyright notice and this notice are preserved, and that any
substantive changes or deletions from the original are clearly
marked.
A pointer to the latest version of this and related documentation in
HTML format can be found at the URL
<ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html>.
Abstract
This specification defines a lossless compressed data format. The
data can be produced or consumed, even for an arbitrarily long
sequentially presented input data stream, using only an a priori
bounded amount of intermediate storage. The format presently uses
the DEFLATE compression method but can be easily extended to use
other compression methods. It can be implemented readily in a manner
not covered by patents. This specification also defines the ADLER-32
checksum (an extension and improvement of the Fletcher checksum),
used for detection of data corruption, and provides an algorithm for
computing it.
Deutsch & Gailly Informational [Page 1]
RFC 1950 ZLIB Compressed Data Format Specification May 1996
Table of Contents
1. Introduction ................................................... 2
1.1. Purpose ................................................... 2
1.2. Intended audience ......................................... 3
1.3. Scope ..................................................... 3
1.4. Compliance ................................................ 3
1.5. Definitions of terms and conventions used ................ 3
1.6. Changes from previous versions ............................ 3
2. Detailed specification ......................................... 3
2.1. Overall conventions ....................................... 3
2.2. Data format ............................................... 4
2.3. Compliance ................................................ 7
3. References ..................................................... 7
4. Source code .................................................... 8
5. Security Considerations ........................................ 8
6. Acknowledgements ............................................... 8
7. Authors' Addresses ............................................. 8
8. Appendix: Rationale ............................................ 9
9. Appendix: Sample code ..........................................10
1. Introduction
1.1. Purpose
The purpose of this specification is to define a lossless
compressed data format that:
* Is independent of CPU type, operating system, file system,
and character set, and hence can be used for interchange;
* Can be produced or consumed, even for an arbitrarily long
sequentially presented input data stream, using only an a
priori bounded amount of intermediate storage, and hence can
be used in data communications or similar structures such as
Unix filters;
* Can use a number of different compression methods;
* Can be implemented readily in a manner not covered by
patents, and hence can be practiced freely.
The data format defined by this specification does not attempt to
allow random access to compressed data.
Deutsch & Gailly Informational [Page 2]
RFC 1950 ZLIB Compressed Data Format Specification May 1996
1.2. Intended audience
This specification is intended for use by implementors of software
to compress data into zlib format and/or decompress data from zlib
format.
The text of the specification assumes a basic background in
programming at the level of bits and other primitive data
representations.
1.3. Scope
The specification specifies a compressed data format that can be
used for in-memory compression of a sequence of arbitrary bytes.
1.4. Compliance
Unless otherwise indicated below, a compliant decompressor must be
able to accept and decompress any data set that conforms to all
the specifications presented here; a compliant compressor must
produce data sets that conform to all the specifications presented
here.
1.5. Definitions of terms and conventions used
byte: 8 bits stored or transmitted as a unit (same as an octet).
(For this specification, a byte is exactly 8 bits, even on
machines which store a character on a number of bits different
from 8.) See below, for the numbering of bits within a byte.
1.6. Changes from previous versions
Version 3.1 was the first public release of this specification.
In version 3.2, some terminology was changed and the Adler-32
sample code was rewritten for clarity. In version 3.3, the
support for a preset dictionary was introduced, and the
specification was converted to RFC style.
2. Detailed specification
2.1. Overall conventions
In the diagrams below, a box like this:
+---+
| | <-- the vertical bars might be missing
+---+
Deutsch & Gailly Informational [Page 3]
RFC 1950 ZLIB Compressed Data Format Specification May 1996
represents one byte; a box like this:
+==============+
| |
+==============+
represents a variable number of bytes.
Bytes stored within a computer do not have a "bit order", since
they are always treated as a unit. However, a byte considered as
an integer between 0 and 255 does have a most- and least-
significant bit, and since we write numbers with the most-
significant digit on the left, we also write bytes with the most-
significant bit on the left. In the diagrams below, we number the
bits of a byte so that bit 0 is the least-significant bit, i.e.,
the bits are numbered:
+--------+
|76543210|
+--------+
Within a computer, a number may occupy multiple bytes. All
multi-byte numbers in the format described here are stored with
the MOST-significant byte first (at the lower memory address).
For example, the decimal number 520 is stored as:
0 1
+--------+--------+
|00000010|00001000|
+--------+--------+
^ ^
| |
| + less significant byte = 8
+ more significant byte = 2 x 256
2.2. Data format
A zlib stream has the following structure:
0 1
+---+---+
|CMF|FLG| (more-->)
+---+---+
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RFC 1950 ZLIB Compressed Data Format Specification May 1996
(if FLG.FDICT set)
0 1 2 3
+---+---+---+---+
| DICTID | (more-->)
+---+---+---+---+
+=====================+---+---+---+---+
|...compressed data...| ADLER32 |
+=====================+---+---+---+---+
Any data which may appear after ADLER32 are not part of the zlib
stream.
CMF (Compression Method and flags)
This byte is divided into a 4-bit compression method and a 4-
bit information field depending on the compression method.
bits 0 to 3 CM Compression method
bits 4 to 7 CINFO Compression info
CM (Compression method)
This identifies the compression method used in the file. CM = 8
denotes the "deflate" compression method with a window size up
to 32K. This is the method used by gzip and PNG (see
references [1] and [2] in Chapter 3, below, for the reference
documents). CM = 15 is reserved. It might be used in a future
version of this specification to indicate the presence of an
extra field before the compressed data.
CINFO (Compression info)
For CM = 8, CINFO is the base-2 logarithm of the LZ77 window
size, minus eight (CINFO=7 indicates a 32K window size). Values
of CINFO above 7 are not allowed in this version of the
specification. CINFO is not defined in this specification for
CM not equal to 8.
FLG (FLaGs)
This flag byte is divided as follows:
bits 0 to 4 FCHECK (check bits for CMF and FLG)
bit 5 FDICT (preset dictionary)
bits 6 to 7 FLEVEL (compression level)
The FCHECK value must be such that CMF and FLG, when viewed as
a 16-bit unsigned integer stored in MSB order (CMF*256 + FLG),
is a multiple of 31.
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FDICT (Preset dictionary)
If FDICT is set, a DICT dictionary identifier is present
immediately after the FLG byte. The dictionary is a sequence of
bytes which are initially fed to the compressor without
producing any compressed output. DICT is the Adler-32 checksum
of this sequence of bytes (see the definition of ADLER32
below). The decompressor can use this identifier to determine
which dictionary has been used by the compressor.
FLEVEL (Compression level)
These flags are available for use by specific compression
methods. The "deflate" method (CM = 8) sets these flags as
follows:
0 - compressor used fastest algorithm
1 - compressor used fast algorithm
2 - compressor used default algorithm
3 - compressor used maximum compression, slowest algorithm
The information in FLEVEL is not needed for decompression; it
is there to indicate if recompression might be worthwhile.
compressed data
For compression method 8, the compressed data is stored in the
deflate compressed data format as described in the document
"DEFLATE Compressed Data Format Specification" by L. Peter
Deutsch. (See reference [3] in Chapter 3, below)
Other compressed data formats are not specified in this version
of the zlib specification.
ADLER32 (Adler-32 checksum)
This contains a checksum value of the uncompressed data
(excluding any dictionary data) computed according to Adler-32
algorithm. This algorithm is a 32-bit extension and improvement
of the Fletcher algorithm, used in the ITU-T X.224 / ISO 8073
standard. See references [4] and [5] in Chapter 3, below)
Adler-32 is composed of two sums accumulated per byte: s1 is
the sum of all bytes, s2 is the sum of all s1 values. Both sums
are done modulo 65521. s1 is initialized to 1, s2 to zero. The
Adler-32 checksum is stored as s2*65536 + s1 in most-
significant-byte first (network) order.
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RFC 1950 ZLIB Compressed Data Format Specification May 1996
2.3. Compliance
A compliant compressor must produce streams with correct CMF, FLG
and ADLER32, but need not support preset dictionaries. When the
zlib data format is used as part of another standard data format,
the compressor may use only preset dictionaries that are specified
by this other data format. If this other format does not use the
preset dictionary feature, the compressor must not set the FDICT
flag.
A compliant decompressor must check CMF, FLG, and ADLER32, and
provide an error indication if any of these have incorrect values.
A compliant decompressor must give an error indication if CM is
not one of the values defined in this specification (only the
value 8 is permitted in this version), since another value could
indicate the presence of new features that would cause subsequent
data to be interpreted incorrectly. A compliant decompressor must
give an error indication if FDICT is set and DICTID is not the
identifier of a known preset dictionary. A decompressor may
ignore FLEVEL and still be compliant. When the zlib data format
is being used as a part of another standard format, a compliant
decompressor must support all the preset dictionaries specified by
the other format. When the other format does not use the preset
dictionary feature, a compliant decompressor must reject any
stream in which the FDICT flag is set.
3. References
[1] Deutsch, L.P.,"GZIP Compressed Data Format Specification",
available in ftp://ftp.uu.net/pub/archiving/zip/doc/
[2] Thomas Boutell, "PNG (Portable Network Graphics) specification",
available in ftp://ftp.uu.net/graphics/png/documents/
[3] Deutsch, L.P.,"DEFLATE Compressed Data Format Specification",
available in ftp://ftp.uu.net/pub/archiving/zip/doc/
[4] Fletcher, J. G., "An Arithmetic Checksum for Serial
Transmissions," IEEE Transactions on Communications, Vol. COM-30,
No. 1, January 1982, pp. 247-252.
[5] ITU-T Recommendation X.224, Annex D, "Checksum Algorithms,"
November, 1993, pp. 144, 145. (Available from
gopher://info.itu.ch). ITU-T X.244 is also the same as ISO 8073.
Deutsch & Gailly Informational [Page 7]
RFC 1950 ZLIB Compressed Data Format Specification May 1996
4. Source code
Source code for a C language implementation of a "zlib" compliant
library is available at ftp://ftp.uu.net/pub/archiving/zip/zlib/.
5. Security Considerations
A decoder that fails to check the ADLER32 checksum value may be
subject to undetected data corruption.
6. Acknowledgements
Trademarks cited in this document are the property of their
respective owners.
Jean-Loup Gailly and Mark Adler designed the zlib format and wrote
the related software described in this specification. Glenn
Randers-Pehrson converted this document to RFC and HTML format.
7. Authors' Addresses
L. Peter Deutsch
Aladdin Enterprises
203 Santa Margarita Ave.
Menlo Park, CA 94025
Phone: (415) 322-0103 (AM only)
FAX: (415) 322-1734
EMail: <ghost@aladdin.com>
Jean-Loup Gailly
EMail: <gzip@prep.ai.mit.edu>
Questions about the technical content of this specification can be
sent by email to
Jean-Loup Gailly <gzip@prep.ai.mit.edu> and
Mark Adler <madler@alumni.caltech.edu>
Editorial comments on this specification can be sent by email to
L. Peter Deutsch <ghost@aladdin.com> and
Glenn Randers-Pehrson <randeg@alumni.rpi.edu>
Deutsch & Gailly Informational [Page 8]
RFC 1950 ZLIB Compressed Data Format Specification May 1996
8. Appendix: Rationale
8.1. Preset dictionaries
A preset dictionary is specially useful to compress short input
sequences. The compressor can take advantage of the dictionary
context to encode the input in a more compact manner. The
decompressor can be initialized with the appropriate context by
virtually decompressing a compressed version of the dictionary
without producing any output. However for certain compression
algorithms such as the deflate algorithm this operation can be
achieved without actually performing any decompression.
The compressor and the decompressor must use exactly the same
dictionary. The dictionary may be fixed or may be chosen among a
certain number of predefined dictionaries, according to the kind
of input data. The decompressor can determine which dictionary has
been chosen by the compressor by checking the dictionary
identifier. This document does not specify the contents of
predefined dictionaries, since the optimal dictionaries are
application specific. Standard data formats using this feature of
the zlib specification must precisely define the allowed
dictionaries.
8.2. The Adler-32 algorithm
The Adler-32 algorithm is much faster than the CRC32 algorithm yet
still provides an extremely low probability of undetected errors.
The modulo on unsigned long accumulators can be delayed for 5552
bytes, so the modulo operation time is negligible. If the bytes
are a, b, c, the second sum is 3a + 2b + c + 3, and so is position
and order sensitive, unlike the first sum, which is just a
checksum. That 65521 is prime is important to avoid a possible
large class of two-byte errors that leave the check unchanged.
(The Fletcher checksum uses 255, which is not prime and which also
makes the Fletcher check insensitive to single byte changes 0 <->
255.)
The sum s1 is initialized to 1 instead of zero to make the length
of the sequence part of s2, so that the length does not have to be
checked separately. (Any sequence of zeroes has a Fletcher
checksum of zero.)
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9. Appendix: Sample code
The following C code computes the Adler-32 checksum of a data buffer.
It is written for clarity, not for speed. The sample code is in the
ANSI C programming language. Non C users may find it easier to read
with these hints:
& Bitwise AND operator.
>> Bitwise right shift operator. When applied to an
unsigned quantity, as here, right shift inserts zero bit(s)
at the left.
<< Bitwise left shift operator. Left shift inserts zero
bit(s) at the right.
++ "n++" increments the variable n.
% modulo operator: a % b is the remainder of a divided by b.
#define BASE 65521 /* largest prime smaller than 65536 */
/*
Update a running Adler-32 checksum with the bytes buf[0..len-1]
and return the updated checksum. The Adler-32 checksum should be
initialized to 1.
Usage example:
unsigned long adler = 1L;
while (read_buffer(buffer, length) != EOF) {
adler = update_adler32(adler, buffer, length);
}
if (adler != original_adler) error();
*/
unsigned long update_adler32(unsigned long adler,
unsigned char *buf, int len)
{
unsigned long s1 = adler & 0xffff;
unsigned long s2 = (adler >> 16) & 0xffff;
int n;
for (n = 0; n < len; n++) {
s1 = (s1 + buf[n]) % BASE;
s2 = (s2 + s1) % BASE;
}
return (s2 << 16) + s1;
}
/* Return the adler32 of the bytes buf[0..len-1] */
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unsigned long adler32(unsigned char *buf, int len)
{
return update_adler32(1L, buf, len);
}
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Network Working Group P. Deutsch
Request for Comments: 1951 Aladdin Enterprises
Category: Informational May 1996
DEFLATE Compressed Data Format Specification version 1.3
Status of This Memo
This memo provides information for the Internet community. This memo
does not specify an Internet standard of any kind. Distribution of
this memo is unlimited.
IESG Note:
The IESG takes no position on the validity of any Intellectual
Property Rights statements contained in this document.
Notices
Copyright (c) 1996 L. Peter Deutsch
Permission is granted to copy and distribute this document for any
purpose and without charge, including translations into other
languages and incorporation into compilations, provided that the
copyright notice and this notice are preserved, and that any
substantive changes or deletions from the original are clearly
marked.
A pointer to the latest version of this and related documentation in
HTML format can be found at the URL
<ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html>.
Abstract
This specification defines a lossless compressed data format that
compresses data using a combination of the LZ77 algorithm and Huffman
coding, with efficiency comparable to the best currently available
general-purpose compression methods. The data can be produced or
consumed, even for an arbitrarily long sequentially presented input
data stream, using only an a priori bounded amount of intermediate
storage. The format can be implemented readily in a manner not
covered by patents.
Deutsch Informational [Page 1]
RFC 1951 DEFLATE Compressed Data Format Specification May 1996
Table of Contents
1. Introduction ................................................... 2
1.1. Purpose ................................................... 2
1.2. Intended audience ......................................... 3
1.3. Scope ..................................................... 3
1.4. Compliance ................................................ 3
1.5. Definitions of terms and conventions used ................ 3
1.6. Changes from previous versions ............................ 4
2. Compressed representation overview ............................. 4
3. Detailed specification ......................................... 5
3.1. Overall conventions ....................................... 5
3.1.1. Packing into bytes .................................. 5
3.2. Compressed block format ................................... 6
3.2.1. Synopsis of prefix and Huffman coding ............... 6
3.2.2. Use of Huffman coding in the "deflate" format ....... 7
3.2.3. Details of block format ............................. 9
3.2.4. Non-compressed blocks (BTYPE=00) ................... 11
3.2.5. Compressed blocks (length and distance codes) ...... 11
3.2.6. Compression with fixed Huffman codes (BTYPE=01) .... 12
3.2.7. Compression with dynamic Huffman codes (BTYPE=10) .. 13
3.3. Compliance ............................................... 14
4. Compression algorithm details ................................. 14
5. References .................................................... 16
6. Security Considerations ....................................... 16
7. Source code ................................................... 16
8. Acknowledgements .............................................. 16
9. Author's Address .............................................. 17
1. Introduction
1.1. Purpose
The purpose of this specification is to define a lossless
compressed data format that:
* Is independent of CPU type, operating system, file system,
and character set, and hence can be used for interchange;
* Can be produced or consumed, even for an arbitrarily long
sequentially presented input data stream, using only an a
priori bounded amount of intermediate storage, and hence
can be used in data communications or similar structures
such as Unix filters;
* Compresses data with efficiency comparable to the best
currently available general-purpose compression methods,
and in particular considerably better than the "compress"
program;
* Can be implemented readily in a manner not covered by
patents, and hence can be practiced freely;
Deutsch Informational [Page 2]
RFC 1951 DEFLATE Compressed Data Format Specification May 1996
* Is compatible with the file format produced by the current
widely used gzip utility, in that conforming decompressors
will be able to read data produced by the existing gzip
compressor.
The data format defined by this specification does not attempt to:
* Allow random access to compressed data;
* Compress specialized data (e.g., raster graphics) as well
as the best currently available specialized algorithms.
A simple counting argument shows that no lossless compression
algorithm can compress every possible input data set. For the
format defined here, the worst case expansion is 5 bytes per 32K-
byte block, i.e., a size increase of 0.015% for large data sets.
English text usually compresses by a factor of 2.5 to 3;
executable files usually compress somewhat less; graphical data
such as raster images may compress much more.
1.2. Intended audience
This specification is intended for use by implementors of software
to compress data into "deflate" format and/or decompress data from
"deflate" format.
The text of the specification assumes a basic background in
programming at the level of bits and other primitive data
representations. Familiarity with the technique of Huffman coding
is helpful but not required.
1.3. Scope
The specification specifies a method for representing a sequence
of bytes as a (usually shorter) sequence of bits, and a method for
packing the latter bit sequence into bytes.
1.4. Compliance
Unless otherwise indicated below, a compliant decompressor must be
able to accept and decompress any data set that conforms to all
the specifications presented here; a compliant compressor must
produce data sets that conform to all the specifications presented
here.
1.5. Definitions of terms and conventions used
Byte: 8 bits stored or transmitted as a unit (same as an octet).
For this specification, a byte is exactly 8 bits, even on machines
Deutsch Informational [Page 3]
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which store a character on a number of bits different from eight.
See below, for the numbering of bits within a byte.
String: a sequence of arbitrary bytes.
1.6. Changes from previous versions
There have been no technical changes to the deflate format since
version 1.1 of this specification. In version 1.2, some
terminology was changed. Version 1.3 is a conversion of the
specification to RFC style.
2. Compressed representation overview
A compressed data set consists of a series of blocks, corresponding
to successive blocks of input data. The block sizes are arbitrary,
except that non-compressible blocks are limited to 65,535 bytes.
Each block is compressed using a combination of the LZ77 algorithm
and Huffman coding. The Huffman trees for each block are independent
of those for previous or subsequent blocks; the LZ77 algorithm may
use a reference to a duplicated string occurring in a previous block,
up to 32K input bytes before.
Each block consists of two parts: a pair of Huffman code trees that
describe the representation of the compressed data part, and a
compressed data part. (The Huffman trees themselves are compressed
using Huffman encoding.) The compressed data consists of a series of
elements of two types: literal bytes (of strings that have not been
detected as duplicated within the previous 32K input bytes), and
pointers to duplicated strings, where a pointer is represented as a
pair <length, backward distance>. The representation used in the
"deflate" format limits distances to 32K bytes and lengths to 258
bytes, but does not limit the size of a block, except for
uncompressible blocks, which are limited as noted above.
Each type of value (literals, distances, and lengths) in the
compressed data is represented using a Huffman code, using one code
tree for literals and lengths and a separate code tree for distances.
The code trees for each block appear in a compact form just before
the compressed data for that block.
Deutsch Informational [Page 4]
RFC 1951 DEFLATE Compressed Data Format Specification May 1996
3. Detailed specification
3.1. Overall conventions In the diagrams below, a box like this:
+---+
| | <-- the vertical bars might be missing
+---+
represents one byte; a box like this:
+==============+
| |
+==============+
represents a variable number of bytes.
Bytes stored within a computer do not have a "bit order", since
they are always treated as a unit. However, a byte considered as
an integer between 0 and 255 does have a most- and least-
significant bit, and since we write numbers with the most-
significant digit on the left, we also write bytes with the most-
significant bit on the left. In the diagrams below, we number the
bits of a byte so that bit 0 is the least-significant bit, i.e.,
the bits are numbered:
+--------+
|76543210|
+--------+
Within a computer, a number may occupy multiple bytes. All
multi-byte numbers in the format described here are stored with
the least-significant byte first (at the lower memory address).
For example, the decimal number 520 is stored as:
0 1
+--------+--------+
|00001000|00000010|
+--------+--------+
^ ^
| |
| + more significant byte = 2 x 256
+ less significant byte = 8
3.1.1. Packing into bytes
This document does not address the issue of the order in which
bits of a byte are transmitted on a bit-sequential medium,
since the final data format described here is byte- rather than
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bit-oriented. However, we describe the compressed block format
in below, as a sequence of data elements of various bit
lengths, not a sequence of bytes. We must therefore specify
how to pack these data elements into bytes to form the final
compressed byte sequence:
* Data elements are packed into bytes in order of
increasing bit number within the byte, i.e., starting
with the least-significant bit of the byte.
* Data elements other than Huffman codes are packed
starting with the least-significant bit of the data
element.
* Huffman codes are packed starting with the most-
significant bit of the code.
In other words, if one were to print out the compressed data as
a sequence of bytes, starting with the first byte at the
*right* margin and proceeding to the *left*, with the most-
significant bit of each byte on the left as usual, one would be
able to parse the result from right to left, with fixed-width
elements in the correct MSB-to-LSB order and Huffman codes in
bit-reversed order (i.e., with the first bit of the code in the
relative LSB position).
3.2. Compressed block format
3.2.1. Synopsis of prefix and Huffman coding
Prefix coding represents symbols from an a priori known
alphabet by bit sequences (codes), one code for each symbol, in
a manner such that different symbols may be represented by bit
sequences of different lengths, but a parser can always parse
an encoded string unambiguously symbol-by-symbol.
We define a prefix code in terms of a binary tree in which the
two edges descending from each non-leaf node are labeled 0 and
1 and in which the leaf nodes correspond one-for-one with (are
labeled with) the symbols of the alphabet; then the code for a
symbol is the sequence of 0's and 1's on the edges leading from
the root to the leaf labeled with that symbol. For example:
Deutsch Informational [Page 6]
RFC 1951 DEFLATE Compressed Data Format Specification May 1996
/\ Symbol Code
0 1 ------ ----
/ \ A 00
/\ B B 1
0 1 C 011
/ \ D 010
A /\
0 1
/ \
D C
A parser can decode the next symbol from an encoded input
stream by walking down the tree from the root, at each step
choosing the edge corresponding to the next input bit.
Given an alphabet with known symbol frequencies, the Huffman
algorithm allows the construction of an optimal prefix code
(one which represents strings with those symbol frequencies
using the fewest bits of any possible prefix codes for that
alphabet). Such a code is called a Huffman code. (See
reference [1] in Chapter 5, references for additional
information on Huffman codes.)
Note that in the "deflate" format, the Huffman codes for the
various alphabets must not exceed certain maximum code lengths.
This constraint complicates the algorithm for computing code
lengths from symbol frequencies. Again, see Chapter 5,
references for details.
3.2.2. Use of Huffman coding in the "deflate" format
The Huffman codes used for each alphabet in the "deflate"
format have two additional rules:
* All codes of a given bit length have lexicographically
consecutive values, in the same order as the symbols
they represent;
* Shorter codes lexicographically precede longer codes.
Deutsch Informational [Page 7]
RFC 1951 DEFLATE Compressed Data Format Specification May 1996
We could recode the example above to follow this rule as
follows, assuming that the order of the alphabet is ABCD:
Symbol Code
------ ----
A 10
B 0
C 110
D 111
I.e., 0 precedes 10 which precedes 11x, and 110 and 111 are
lexicographically consecutive.
Given this rule, we can define the Huffman code for an alphabet
just by giving the bit lengths of the codes for each symbol of
the alphabet in order; this is sufficient to determine the
actual codes. In our example, the code is completely defined
by the sequence of bit lengths (2, 1, 3, 3). The following
algorithm generates the codes as integers, intended to be read
from most- to least-significant bit. The code lengths are
initially in tree[I].Len; the codes are produced in
tree[I].Code.
1) Count the number of codes for each code length. Let
bl_count[N] be the number of codes of length N, N >= 1.
2) Find the numerical value of the smallest code for each
code length:
code = 0;
bl_count[0] = 0;
for (bits = 1; bits <= MAX_BITS; bits++) {
code = (code + bl_count[bits-1]) << 1;
next_code[bits] = code;
}
3) Assign numerical values to all codes, using consecutive
values for all codes of the same length with the base
values determined at step 2. Codes that are never used
(which have a bit length of zero) must not be assigned a
value.
for (n = 0; n <= max_code; n++) {
len = tree[n].Len;
if (len != 0) {
tree[n].Code = next_code[len];
next_code[len]++;
}
Deutsch Informational [Page 8]
RFC 1951 DEFLATE Compressed Data Format Specification May 1996
}
Example:
Consider the alphabet ABCDEFGH, with bit lengths (3, 3, 3, 3,
3, 2, 4, 4). After step 1, we have:
N bl_count[N]
- -----------
2 1
3 5
4 2
Step 2 computes the following next_code values:
N next_code[N]
- ------------
1 0
2 0
3 2
4 14
Step 3 produces the following code values:
Symbol Length Code
------ ------ ----
A 3 010
B 3 011
C 3 100
D 3 101
E 3 110
F 2 00
G 4 1110
H 4 1111
3.2.3. Details of block format
Each block of compressed data begins with 3 header bits
containing the following data:
first bit BFINAL
next 2 bits BTYPE
Note that the header bits do not necessarily begin on a byte
boundary, since a block does not necessarily occupy an integral
number of bytes.
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RFC 1951 DEFLATE Compressed Data Format Specification May 1996
BFINAL is set if and only if this is the last block of the data
set.
BTYPE specifies how the data are compressed, as follows:
00 - no compression
01 - compressed with fixed Huffman codes
10 - compressed with dynamic Huffman codes
11 - reserved (error)
The only difference between the two compressed cases is how the
Huffman codes for the literal/length and distance alphabets are
defined.
In all cases, the decoding algorithm for the actual data is as
follows:
do
read block header from input stream.
if stored with no compression
skip any remaining bits in current partially
processed byte
read LEN and NLEN (see next section)
copy LEN bytes of data to output
otherwise
if compressed with dynamic Huffman codes
read representation of code trees (see
subsection below)
loop (until end of block code recognized)
decode literal/length value from input stream
if value < 256
copy value (literal byte) to output stream
otherwise
if value = end of block (256)
break from loop
otherwise (value = 257..285)
decode distance from input stream
move backwards distance bytes in the output
stream, and copy length bytes from this
position to the output stream.
end loop
while not last block
Note that a duplicated string reference may refer to a string
in a previous block; i.e., the backward distance may cross one
or more block boundaries. However a distance cannot refer past
the beginning of the output stream. (An application using a
Deutsch Informational [Page 10]
RFC 1951 DEFLATE Compressed Data Format Specification May 1996
preset dictionary might discard part of the output stream; a
distance can refer to that part of the output stream anyway)
Note also that the referenced string may overlap the current
position; for example, if the last 2 bytes decoded have values
X and Y, a string reference with <length = 5, distance = 2>
adds X,Y,X,Y,X to the output stream.
We now specify each compression method in turn.
3.2.4. Non-compressed blocks (BTYPE=00)
Any bits of input up to the next byte boundary are ignored.
The rest of the block consists of the following information:
0 1 2 3 4...
+---+---+---+---+================================+
| LEN | NLEN |... LEN bytes of literal data...|
+---+---+---+---+================================+
LEN is the number of data bytes in the block. NLEN is the
one's complement of LEN.
3.2.5. Compressed blocks (length and distance codes)
As noted above, encoded data blocks in the "deflate" format
consist of sequences of symbols drawn from three conceptually
distinct alphabets: either literal bytes, from the alphabet of
byte values (0..255), or <length, backward distance> pairs,
where the length is drawn from (3..258) and the distance is
drawn from (1..32,768). In fact, the literal and length
alphabets are merged into a single alphabet (0..285), where
values 0..255 represent literal bytes, the value 256 indicates
end-of-block, and values 257..285 represent length codes
(possibly in conjunction with extra bits following the symbol
code) as follows:
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RFC 1951 DEFLATE Compressed Data Format Specification May 1996
Extra Extra Extra
Code Bits Length(s) Code Bits Lengths Code Bits Length(s)
---- ---- ------ ---- ---- ------- ---- ---- -------
257 0 3 267 1 15,16 277 4 67-82
258 0 4 268 1 17,18 278 4 83-98
259 0 5 269 2 19-22 279 4 99-114
260 0 6 270 2 23-26 280 4 115-130
261 0 7 271 2 27-30 281 5 131-162
262 0 8 272 2 31-34 282 5 163-194
263 0 9 273 3 35-42 283 5 195-226
264 0 10 274 3 43-50 284 5 227-257
265 1 11,12 275 3 51-58 285 0 258
266 1 13,14 276 3 59-66
The extra bits should be interpreted as a machine integer
stored with the most-significant bit first, e.g., bits 1110
represent the value 14.
Extra Extra Extra
Code Bits Dist Code Bits Dist Code Bits Distance
---- ---- ---- ---- ---- ------ ---- ---- --------
0 0 1 10 4 33-48 20 9 1025-1536
1 0 2 11 4 49-64 21 9 1537-2048
2 0 3 12 5 65-96 22 10 2049-3072
3 0 4 13 5 97-128 23 10 3073-4096
4 1 5,6 14 6 129-192 24 11 4097-6144
5 1 7,8 15 6 193-256 25 11 6145-8192
6 2 9-12 16 7 257-384 26 12 8193-12288
7 2 13-16 17 7 385-512 27 12 12289-16384
8 3 17-24 18 8 513-768 28 13 16385-24576
9 3 25-32 19 8 769-1024 29 13 24577-32768
3.2.6. Compression with fixed Huffman codes (BTYPE=01)
The Huffman codes for the two alphabets are fixed, and are not
represented explicitly in the data. The Huffman code lengths
for the literal/length alphabet are:
Lit Value Bits Codes
--------- ---- -----
0 - 143 8 00110000 through
10111111
144 - 255 9 110010000 through
111111111
256 - 279 7 0000000 through
0010111
280 - 287 8 11000000 through
11000111
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RFC 1951 DEFLATE Compressed Data Format Specification May 1996
The code lengths are sufficient to generate the actual codes,
as described above; we show the codes in the table for added
clarity. Literal/length values 286-287 will never actually
occur in the compressed data, but participate in the code
construction.
Distance codes 0-31 are represented by (fixed-length) 5-bit
codes, with possible additional bits as shown in the table
shown in Paragraph 3.2.5, above. Note that distance codes 30-
31 will never actually occur in the compressed data.
3.2.7. Compression with dynamic Huffman codes (BTYPE=10)
The Huffman codes for the two alphabets appear in the block
immediately after the header bits and before the actual
compressed data, first the literal/length code and then the
distance code. Each code is defined by a sequence of code
lengths, as discussed in Paragraph 3.2.2, above. For even
greater compactness, the code length sequences themselves are
compressed using a Huffman code. The alphabet for code lengths
is as follows:
0 - 15: Represent code lengths of 0 - 15
16: Copy the previous code length 3 - 6 times.
The next 2 bits indicate repeat length
(0 = 3, ... , 3 = 6)
Example: Codes 8, 16 (+2 bits 11),
16 (+2 bits 10) will expand to
12 code lengths of 8 (1 + 6 + 5)
17: Repeat a code length of 0 for 3 - 10 times.
(3 bits of length)
18: Repeat a code length of 0 for 11 - 138 times
(7 bits of length)
A code length of 0 indicates that the corresponding symbol in
the literal/length or distance alphabet will not occur in the
block, and should not participate in the Huffman code
construction algorithm given earlier. If only one distance
code is used, it is encoded using one bit, not zero bits; in
this case there is a single code length of one, with one unused
code. One distance code of zero bits means that there are no
distance codes used at all (the data is all literals).
We can now define the format of the block:
5 Bits: HLIT, # of Literal/Length codes - 257 (257 - 286)
5 Bits: HDIST, # of Distance codes - 1 (1 - 32)
4 Bits: HCLEN, # of Code Length codes - 4 (4 - 19)
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RFC 1951 DEFLATE Compressed Data Format Specification May 1996
(HCLEN + 4) x 3 bits: code lengths for the code length
alphabet given just above, in the order: 16, 17, 18,
0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15
These code lengths are interpreted as 3-bit integers
(0-7); as above, a code length of 0 means the
corresponding symbol (literal/length or distance code
length) is not used.
HLIT + 257 code lengths for the literal/length alphabet,
encoded using the code length Huffman code
HDIST + 1 code lengths for the distance alphabet,
encoded using the code length Huffman code
The actual compressed data of the block,
encoded using the literal/length and distance Huffman
codes
The literal/length symbol 256 (end of data),
encoded using the literal/length Huffman code
The code length repeat codes can cross from HLIT + 257 to the
HDIST + 1 code lengths. In other words, all code lengths form
a single sequence of HLIT + HDIST + 258 values.
3.3. Compliance
A compressor may limit further the ranges of values specified in
the previous section and still be compliant; for example, it may
limit the range of backward pointers to some value smaller than
32K. Similarly, a compressor may limit the size of blocks so that
a compressible block fits in memory.
A compliant decompressor must accept the full range of possible
values defined in the previous section, and must accept blocks of
arbitrary size.
4. Compression algorithm details
While it is the intent of this document to define the "deflate"
compressed data format without reference to any particular
compression algorithm, the format is related to the compressed
formats produced by LZ77 (Lempel-Ziv 1977, see reference [2] below);
since many variations of LZ77 are patented, it is strongly
recommended that the implementor of a compressor follow the general
algorithm presented here, which is known not to be patented per se.
The material in this section is not part of the definition of the
Deutsch Informational [Page 14]
RFC 1951 DEFLATE Compressed Data Format Specification May 1996
specification per se, and a compressor need not follow it in order to
be compliant.
The compressor terminates a block when it determines that starting a
new block with fresh trees would be useful, or when the block size
fills up the compressor's block buffer.
The compressor uses a chained hash table to find duplicated strings,
using a hash function that operates on 3-byte sequences. At any
given point during compression, let XYZ be the next 3 input bytes to
be examined (not necessarily all different, of course). First, the
compressor examines the hash chain for XYZ. If the chain is empty,
the compressor simply writes out X as a literal byte and advances one
byte in the input. If the hash chain is not empty, indicating that
the sequence XYZ (or, if we are unlucky, some other 3 bytes with the
same hash function value) has occurred recently, the compressor
compares all strings on the XYZ hash chain with the actual input data
sequence starting at the current point, and selects the longest
match.
The compressor searches the hash chains starting with the most recent
strings, to favor small distances and thus take advantage of the
Huffman encoding. The hash chains are singly linked. There are no
deletions from the hash chains; the algorithm simply discards matches
that are too old. To avoid a worst-case situation, very long hash
chains are arbitrarily truncated at a certain length, determined by a
run-time parameter.
To improve overall compression, the compressor optionally defers the
selection of matches ("lazy matching"): after a match of length N has
been found, the compressor searches for a longer match starting at
the next input byte. If it finds a longer match, it truncates the
previous match to a length of one (thus producing a single literal
byte) and then emits the longer match. Otherwise, it emits the
original match, and, as described above, advances N bytes before
continuing.
Run-time parameters also control this "lazy match" procedure. If
compression ratio is most important, the compressor attempts a
complete second search regardless of the length of the first match.
In the normal case, if the current match is "long enough", the
compressor reduces the search for a longer match, thus speeding up
the process. If speed is most important, the compressor inserts new
strings in the hash table only when no match was found, or when the
match is not "too long". This degrades the compression ratio but
saves time since there are both fewer insertions and fewer searches.
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RFC 1951 DEFLATE Compressed Data Format Specification May 1996
5. References
[1] Huffman, D. A., "A Method for the Construction of Minimum
Redundancy Codes", Proceedings of the Institute of Radio
Engineers, September 1952, Volume 40, Number 9, pp. 1098-1101.
[2] Ziv J., Lempel A., "A Universal Algorithm for Sequential Data
Compression", IEEE Transactions on Information Theory, Vol. 23,
No. 3, pp. 337-343.
[3] Gailly, J.-L., and Adler, M., ZLIB documentation and sources,
available in ftp://ftp.uu.net/pub/archiving/zip/doc/
[4] Gailly, J.-L., and Adler, M., GZIP documentation and sources,
available as gzip-*.tar in ftp://prep.ai.mit.edu/pub/gnu/
[5] Schwartz, E. S., and Kallick, B. "Generating a canonical prefix
encoding." Comm. ACM, 7,3 (Mar. 1964), pp. 166-169.
[6] Hirschberg and Lelewer, "Efficient decoding of prefix codes,"
Comm. ACM, 33,4, April 1990, pp. 449-459.
6. Security Considerations
Any data compression method involves the reduction of redundancy in
the data. Consequently, any corruption of the data is likely to have
severe effects and be difficult to correct. Uncompressed text, on
the other hand, will probably still be readable despite the presence
of some corrupted bytes.
It is recommended that systems using this data format provide some
means of validating the integrity of the compressed data. See
reference [3], for example.
7. Source code
Source code for a C language implementation of a "deflate" compliant
compressor and decompressor is available within the zlib package at
ftp://ftp.uu.net/pub/archiving/zip/zlib/.
8. Acknowledgements
Trademarks cited in this document are the property of their
respective owners.
Phil Katz designed the deflate format. Jean-Loup Gailly and Mark
Adler wrote the related software described in this specification.
Glenn Randers-Pehrson converted this document to RFC and HTML format.
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RFC 1951 DEFLATE Compressed Data Format Specification May 1996
9. Author's Address
L. Peter Deutsch
Aladdin Enterprises
203 Santa Margarita Ave.
Menlo Park, CA 94025
Phone: (415) 322-0103 (AM only)
FAX: (415) 322-1734
EMail: <ghost@aladdin.com>
Questions about the technical content of this specification can be
sent by email to:
Jean-Loup Gailly <gzip@prep.ai.mit.edu> and
Mark Adler <madler@alumni.caltech.edu>
Editorial comments on this specification can be sent by email to:
L. Peter Deutsch <ghost@aladdin.com> and
Glenn Randers-Pehrson <randeg@alumni.rpi.edu>
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Network Working Group P. Deutsch
Request for Comments: 1952 Aladdin Enterprises
Category: Informational May 1996
GZIP file format specification version 4.3
Status of This Memo
This memo provides information for the Internet community. This memo
does not specify an Internet standard of any kind. Distribution of
this memo is unlimited.
IESG Note:
The IESG takes no position on the validity of any Intellectual
Property Rights statements contained in this document.
Notices
Copyright (c) 1996 L. Peter Deutsch
Permission is granted to copy and distribute this document for any
purpose and without charge, including translations into other
languages and incorporation into compilations, provided that the
copyright notice and this notice are preserved, and that any
substantive changes or deletions from the original are clearly
marked.
A pointer to the latest version of this and related documentation in
HTML format can be found at the URL
<ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html>.
Abstract
This specification defines a lossless compressed data format that is
compatible with the widely used GZIP utility. The format includes a
cyclic redundancy check value for detecting data corruption. The
format presently uses the DEFLATE method of compression but can be
easily extended to use other compression methods. The format can be
implemented readily in a manner not covered by patents.
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RFC 1952 GZIP File Format Specification May 1996
Table of Contents
1. Introduction ................................................... 2
1.1. Purpose ................................................... 2
1.2. Intended audience ......................................... 3
1.3. Scope ..................................................... 3
1.4. Compliance ................................................ 3
1.5. Definitions of terms and conventions used ................. 3
1.6. Changes from previous versions ............................ 3
2. Detailed specification ......................................... 4
2.1. Overall conventions ....................................... 4
2.2. File format ............................................... 5
2.3. Member format ............................................. 5
2.3.1. Member header and trailer ........................... 6
2.3.1.1. Extra field ................................... 8
2.3.1.2. Compliance .................................... 9
3. References .................................................. 9
4. Security Considerations .................................... 10
5. Acknowledgements ........................................... 10
6. Author's Address ........................................... 10
7. Appendix: Jean-Loup Gailly's gzip utility .................. 11
8. Appendix: Sample CRC Code .................................. 11
1. Introduction
1.1. Purpose
The purpose of this specification is to define a lossless
compressed data format that:
* Is independent of CPU type, operating system, file system,
and character set, and hence can be used for interchange;
* Can compress or decompress a data stream (as opposed to a
randomly accessible file) to produce another data stream,
using only an a priori bounded amount of intermediate
storage, and hence can be used in data communications or
similar structures such as Unix filters;
* Compresses data with efficiency comparable to the best
currently available general-purpose compression methods,
and in particular considerably better than the "compress"
program;
* Can be implemented readily in a manner not covered by
patents, and hence can be practiced freely;
* Is compatible with the file format produced by the current
widely used gzip utility, in that conforming decompressors
will be able to read data produced by the existing gzip
compressor.
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RFC 1952 GZIP File Format Specification May 1996
The data format defined by this specification does not attempt to:
* Provide random access to compressed data;
* Compress specialized data (e.g., raster graphics) as well as
the best currently available specialized algorithms.
1.2. Intended audience
This specification is intended for use by implementors of software
to compress data into gzip format and/or decompress data from gzip
format.
The text of the specification assumes a basic background in
programming at the level of bits and other primitive data
representations.
1.3. Scope
The specification specifies a compression method and a file format
(the latter assuming only that a file can store a sequence of
arbitrary bytes). It does not specify any particular interface to
a file system or anything about character sets or encodings
(except for file names and comments, which are optional).
1.4. Compliance
Unless otherwise indicated below, a compliant decompressor must be
able to accept and decompress any file that conforms to all the
specifications presented here; a compliant compressor must produce
files that conform to all the specifications presented here. The
material in the appendices is not part of the specification per se
and is not relevant to compliance.
1.5. Definitions of terms and conventions used
byte: 8 bits stored or transmitted as a unit (same as an octet).
(For this specification, a byte is exactly 8 bits, even on
machines which store a character on a number of bits different
from 8.) See below for the numbering of bits within a byte.
1.6. Changes from previous versions
There have been no technical changes to the gzip format since
version 4.1 of this specification. In version 4.2, some
terminology was changed, and the sample CRC code was rewritten for
clarity and to eliminate the requirement for the caller to do pre-
and post-conditioning. Version 4.3 is a conversion of the
specification to RFC style.
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RFC 1952 GZIP File Format Specification May 1996
2. Detailed specification
2.1. Overall conventions
In the diagrams below, a box like this:
+---+
| | <-- the vertical bars might be missing
+---+
represents one byte; a box like this:
+==============+
| |
+==============+
represents a variable number of bytes.
Bytes stored within a computer do not have a "bit order", since
they are always treated as a unit. However, a byte considered as
an integer between 0 and 255 does have a most- and least-
significant bit, and since we write numbers with the most-
significant digit on the left, we also write bytes with the most-
significant bit on the left. In the diagrams below, we number the
bits of a byte so that bit 0 is the least-significant bit, i.e.,
the bits are numbered:
+--------+
|76543210|
+--------+
This document does not address the issue of the order in which
bits of a byte are transmitted on a bit-sequential medium, since
the data format described here is byte- rather than bit-oriented.
Within a computer, a number may occupy multiple bytes. All
multi-byte numbers in the format described here are stored with
the least-significant byte first (at the lower memory address).
For example, the decimal number 520 is stored as:
0 1
+--------+--------+
|00001000|00000010|
+--------+--------+
^ ^
| |
| + more significant byte = 2 x 256
+ less significant byte = 8
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RFC 1952 GZIP File Format Specification May 1996
2.2. File format
A gzip file consists of a series of "members" (compressed data
sets). The format of each member is specified in the following
section. The members simply appear one after another in the file,
with no additional information before, between, or after them.
2.3. Member format
Each member has the following structure:
+---+---+---+---+---+---+---+---+---+---+
|ID1|ID2|CM |FLG| MTIME |XFL|OS | (more-->)
+---+---+---+---+---+---+---+---+---+---+
(if FLG.FEXTRA set)
+---+---+=================================+
| XLEN |...XLEN bytes of "extra field"...| (more-->)
+---+---+=================================+
(if FLG.FNAME set)
+=========================================+
|...original file name, zero-terminated...| (more-->)
+=========================================+
(if FLG.FCOMMENT set)
+===================================+
|...file comment, zero-terminated...| (more-->)
+===================================+
(if FLG.FHCRC set)
+---+---+
| CRC16 |
+---+---+
+=======================+
|...compressed blocks...| (more-->)
+=======================+
0 1 2 3 4 5 6 7
+---+---+---+---+---+---+---+---+
| CRC32 | ISIZE |
+---+---+---+---+---+---+---+---+
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RFC 1952 GZIP File Format Specification May 1996
2.3.1. Member header and trailer
ID1 (IDentification 1)
ID2 (IDentification 2)
These have the fixed values ID1 = 31 (0x1f, \037), ID2 = 139
(0x8b, \213), to identify the file as being in gzip format.
CM (Compression Method)
This identifies the compression method used in the file. CM
= 0-7 are reserved. CM = 8 denotes the "deflate"
compression method, which is the one customarily used by
gzip and which is documented elsewhere.
FLG (FLaGs)
This flag byte is divided into individual bits as follows:
bit 0 FTEXT
bit 1 FHCRC
bit 2 FEXTRA
bit 3 FNAME
bit 4 FCOMMENT
bit 5 reserved
bit 6 reserved
bit 7 reserved
If FTEXT is set, the file is probably ASCII text. This is
an optional indication, which the compressor may set by
checking a small amount of the input data to see whether any
non-ASCII characters are present. In case of doubt, FTEXT
is cleared, indicating binary data. For systems which have
different file formats for ascii text and binary data, the
decompressor can use FTEXT to choose the appropriate format.
We deliberately do not specify the algorithm used to set
this bit, since a compressor always has the option of
leaving it cleared and a decompressor always has the option
of ignoring it and letting some other program handle issues
of data conversion.
If FHCRC is set, a CRC16 for the gzip header is present,
immediately before the compressed data. The CRC16 consists
of the two least significant bytes of the CRC32 for all
bytes of the gzip header up to and not including the CRC16.
[The FHCRC bit was never set by versions of gzip up to
1.2.4, even though it was documented with a different
meaning in gzip 1.2.4.]
If FEXTRA is set, optional extra fields are present, as
described in a following section.
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RFC 1952 GZIP File Format Specification May 1996
If FNAME is set, an original file name is present,
terminated by a zero byte. The name must consist of ISO
8859-1 (LATIN-1) characters; on operating systems using
EBCDIC or any other character set for file names, the name
must be translated to the ISO LATIN-1 character set. This
is the original name of the file being compressed, with any
directory components removed, and, if the file being
compressed is on a file system with case insensitive names,
forced to lower case. There is no original file name if the
data was compressed from a source other than a named file;
for example, if the source was stdin on a Unix system, there
is no file name.
If FCOMMENT is set, a zero-terminated file comment is
present. This comment is not interpreted; it is only
intended for human consumption. The comment must consist of
ISO 8859-1 (LATIN-1) characters. Line breaks should be
denoted by a single line feed character (10 decimal).
Reserved FLG bits must be zero.
MTIME (Modification TIME)
This gives the most recent modification time of the original
file being compressed. The time is in Unix format, i.e.,
seconds since 00:00:00 GMT, Jan. 1, 1970. (Note that this
may cause problems for MS-DOS and other systems that use
local rather than Universal time.) If the compressed data
did not come from a file, MTIME is set to the time at which
compression started. MTIME = 0 means no time stamp is
available.
XFL (eXtra FLags)
These flags are available for use by specific compression
methods. The "deflate" method (CM = 8) sets these flags as
follows:
XFL = 2 - compressor used maximum compression,
slowest algorithm
XFL = 4 - compressor used fastest algorithm
OS (Operating System)
This identifies the type of file system on which compression
took place. This may be useful in determining end-of-line
convention for text files. The currently defined values are
as follows:
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RFC 1952 GZIP File Format Specification May 1996
0 - FAT filesystem (MS-DOS, OS/2, NT/Win32)
1 - Amiga
2 - VMS (or OpenVMS)
3 - Unix
4 - VM/CMS
5 - Atari TOS
6 - HPFS filesystem (OS/2, NT)
7 - Macintosh
8 - Z-System
9 - CP/M
10 - TOPS-20
11 - NTFS filesystem (NT)
12 - QDOS
13 - Acorn RISCOS
255 - unknown
XLEN (eXtra LENgth)
If FLG.FEXTRA is set, this gives the length of the optional
extra field. See below for details.
CRC32 (CRC-32)
This contains a Cyclic Redundancy Check value of the
uncompressed data computed according to CRC-32 algorithm
used in the ISO 3309 standard and in section 8.1.1.6.2 of
ITU-T recommendation V.42. (See http://www.iso.ch for
ordering ISO documents. See gopher://info.itu.ch for an
online version of ITU-T V.42.)
ISIZE (Input SIZE)
This contains the size of the original (uncompressed) input
data modulo 2^32.
2.3.1.1. Extra field
If the FLG.FEXTRA bit is set, an "extra field" is present in
the header, with total length XLEN bytes. It consists of a
series of subfields, each of the form:
+---+---+---+---+==================================+
|SI1|SI2| LEN |... LEN bytes of subfield data ...|
+---+---+---+---+==================================+
SI1 and SI2 provide a subfield ID, typically two ASCII letters
with some mnemonic value. Jean-Loup Gailly
<gzip@prep.ai.mit.edu> is maintaining a registry of subfield
IDs; please send him any subfield ID you wish to use. Subfield
IDs with SI2 = 0 are reserved for future use. The following
IDs are currently defined:
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RFC 1952 GZIP File Format Specification May 1996
SI1 SI2 Data
---------- ---------- ----
0x41 ('A') 0x70 ('P') Apollo file type information
LEN gives the length of the subfield data, excluding the 4
initial bytes.
2.3.1.2. Compliance
A compliant compressor must produce files with correct ID1,
ID2, CM, CRC32, and ISIZE, but may set all the other fields in
the fixed-length part of the header to default values (255 for
OS, 0 for all others). The compressor must set all reserved
bits to zero.
A compliant decompressor must check ID1, ID2, and CM, and
provide an error indication if any of these have incorrect
values. It must examine FEXTRA/XLEN, FNAME, FCOMMENT and FHCRC
at least so it can skip over the optional fields if they are
present. It need not examine any other part of the header or
trailer; in particular, a decompressor may ignore FTEXT and OS
and always produce binary output, and still be compliant. A
compliant decompressor must give an error indication if any
reserved bit is non-zero, since such a bit could indicate the
presence of a new field that would cause subsequent data to be
interpreted incorrectly.
3. References
[1] "Information Processing - 8-bit single-byte coded graphic
character sets - Part 1: Latin alphabet No.1" (ISO 8859-1:1987).
The ISO 8859-1 (Latin-1) character set is a superset of 7-bit
ASCII. Files defining this character set are available as
iso_8859-1.* in ftp://ftp.uu.net/graphics/png/documents/
[2] ISO 3309
[3] ITU-T recommendation V.42
[4] Deutsch, L.P.,"DEFLATE Compressed Data Format Specification",
available in ftp://ftp.uu.net/pub/archiving/zip/doc/
[5] Gailly, J.-L., GZIP documentation, available as gzip-*.tar in
ftp://prep.ai.mit.edu/pub/gnu/
[6] Sarwate, D.V., "Computation of Cyclic Redundancy Checks via Table
Look-Up", Communications of the ACM, 31(8), pp.1008-1013.
Deutsch Informational [Page 9]
RFC 1952 GZIP File Format Specification May 1996
[7] Schwaderer, W.D., "CRC Calculation", April 85 PC Tech Journal,
pp.118-133.
[8] ftp://ftp.adelaide.edu.au/pub/rocksoft/papers/crc_v3.txt,
describing the CRC concept.
4. Security Considerations
Any data compression method involves the reduction of redundancy in
the data. Consequently, any corruption of the data is likely to have
severe effects and be difficult to correct. Uncompressed text, on
the other hand, will probably still be readable despite the presence
of some corrupted bytes.
It is recommended that systems using this data format provide some
means of validating the integrity of the compressed data, such as by
setting and checking the CRC-32 check value.
5. Acknowledgements
Trademarks cited in this document are the property of their
respective owners.
Jean-Loup Gailly designed the gzip format and wrote, with Mark Adler,
the related software described in this specification. Glenn
Randers-Pehrson converted this document to RFC and HTML format.
6. Author's Address
L. Peter Deutsch
Aladdin Enterprises
203 Santa Margarita Ave.
Menlo Park, CA 94025
Phone: (415) 322-0103 (AM only)
FAX: (415) 322-1734
EMail: <ghost@aladdin.com>
Questions about the technical content of this specification can be
sent by email to:
Jean-Loup Gailly <gzip@prep.ai.mit.edu> and
Mark Adler <madler@alumni.caltech.edu>
Editorial comments on this specification can be sent by email to:
L. Peter Deutsch <ghost@aladdin.com> and
Glenn Randers-Pehrson <randeg@alumni.rpi.edu>
Deutsch Informational [Page 10]
RFC 1952 GZIP File Format Specification May 1996
7. Appendix: Jean-Loup Gailly's gzip utility
The most widely used implementation of gzip compression, and the
original documentation on which this specification is based, were
created by Jean-Loup Gailly <gzip@prep.ai.mit.edu>. Since this
implementation is a de facto standard, we mention some more of its
features here. Again, the material in this section is not part of
the specification per se, and implementations need not follow it to
be compliant.
When compressing or decompressing a file, gzip preserves the
protection, ownership, and modification time attributes on the local
file system, since there is no provision for representing protection
attributes in the gzip file format itself. Since the file format
includes a modification time, the gzip decompressor provides a
command line switch that assigns the modification time from the file,
rather than the local modification time of the compressed input, to
the decompressed output.
8. Appendix: Sample CRC Code
The following sample code represents a practical implementation of
the CRC (Cyclic Redundancy Check). (See also ISO 3309 and ITU-T V.42
for a formal specification.)
The sample code is in the ANSI C programming language. Non C users
may find it easier to read with these hints:
& Bitwise AND operator.
^ Bitwise exclusive-OR operator.
>> Bitwise right shift operator. When applied to an
unsigned quantity, as here, right shift inserts zero
bit(s) at the left.
! Logical NOT operator.
++ "n++" increments the variable n.
0xNNN 0x introduces a hexadecimal (base 16) constant.
Suffix L indicates a long value (at least 32 bits).
/* Table of CRCs of all 8-bit messages. */
unsigned long crc_table[256];
/* Flag: has the table been computed? Initially false. */
int crc_table_computed = 0;
/* Make the table for a fast CRC. */
void make_crc_table(void)
{
unsigned long c;
Deutsch Informational [Page 11]
RFC 1952 GZIP File Format Specification May 1996
int n, k;
for (n = 0; n < 256; n++) {
c = (unsigned long) n;
for (k = 0; k < 8; k++) {
if (c & 1) {
c = 0xedb88320L ^ (c >> 1);
} else {
c = c >> 1;
}
}
crc_table[n] = c;
}
crc_table_computed = 1;
}
/*
Update a running crc with the bytes buf[0..len-1] and return
the updated crc. The crc should be initialized to zero. Pre- and
post-conditioning (one's complement) is performed within this
function so it shouldn't be done by the caller. Usage example:
unsigned long crc = 0L;
while (read_buffer(buffer, length) != EOF) {
crc = update_crc(crc, buffer, length);
}
if (crc != original_crc) error();
*/
unsigned long update_crc(unsigned long crc,
unsigned char *buf, int len)
{
unsigned long c = crc ^ 0xffffffffL;
int n;
if (!crc_table_computed)
make_crc_table();
for (n = 0; n < len; n++) {
c = crc_table[(c ^ buf[n]) & 0xff] ^ (c >> 8);
}
return c ^ 0xffffffffL;
}
/* Return the CRC of the bytes buf[0..len-1]. */
unsigned long crc(unsigned char *buf, int len)
{
return update_crc(0L, buf, len);
}
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A Fast Method for Identifying Plain Text Files
==============================================
Introduction
------------
Given a file coming from an unknown source, it is sometimes desirable
to find out whether the format of that file is plain text. Although
this may appear like a simple task, a fully accurate detection of the
file type requires heavy-duty semantic analysis on the file contents.
It is, however, possible to obtain satisfactory results by employing
various heuristics.
Previous versions of PKZip and other zip-compatible compression tools
were using a crude detection scheme: if more than 80% (4/5) of the bytes
found in a certain buffer are within the range [7..127], the file is
labeled as plain text, otherwise it is labeled as binary. A prominent
limitation of this scheme is the restriction to Latin-based alphabets.
Other alphabets, like Greek, Cyrillic or Asian, make extensive use of
the bytes within the range [128..255], and texts using these alphabets
are most often misidentified by this scheme; in other words, the rate
of false negatives is sometimes too high, which means that the recall
is low. Another weakness of this scheme is a reduced precision, due to
the false positives that may occur when binary files containing large
amounts of textual characters are misidentified as plain text.
In this article we propose a new, simple detection scheme that features
a much increased precision and a near-100% recall. This scheme is
designed to work on ASCII, Unicode and other ASCII-derived alphabets,
and it handles single-byte encodings (ISO-8859, MacRoman, KOI8, etc.)
and variable-sized encodings (ISO-2022, UTF-8, etc.). Wider encodings
(UCS-2/UTF-16 and UCS-4/UTF-32) are not handled, however.
The Algorithm
-------------
The algorithm works by dividing the set of bytecodes [0..255] into three
categories:
- The allow list of textual bytecodes:
9 (TAB), 10 (LF), 13 (CR), 32 (SPACE) to 255.
- The gray list of tolerated bytecodes:
7 (BEL), 8 (BS), 11 (VT), 12 (FF), 26 (SUB), 27 (ESC).
- The block list of undesired, non-textual bytecodes:
0 (NUL) to 6, 14 to 31.
If a file contains at least one byte that belongs to the allow list and
no byte that belongs to the block list, then the file is categorized as
plain text; otherwise, it is categorized as binary. (The boundary case,
when the file is empty, automatically falls into the latter category.)
Rationale
---------
The idea behind this algorithm relies on two observations.
The first observation is that, although the full range of 7-bit codes
[0..127] is properly specified by the ASCII standard, most control
characters in the range [0..31] are not used in practice. The only
widely-used, almost universally-portable control codes are 9 (TAB),
10 (LF) and 13 (CR). There are a few more control codes that are
recognized on a reduced range of platforms and text viewers/editors:
7 (BEL), 8 (BS), 11 (VT), 12 (FF), 26 (SUB) and 27 (ESC); but these
codes are rarely (if ever) used alone, without being accompanied by
some printable text. Even the newer, portable text formats such as
XML avoid using control characters outside the list mentioned here.
The second observation is that most of the binary files tend to contain
control characters, especially 0 (NUL). Even though the older text
detection schemes observe the presence of non-ASCII codes from the range
[128..255], the precision rarely has to suffer if this upper range is
labeled as textual, because the files that are genuinely binary tend to
contain both control characters and codes from the upper range. On the
other hand, the upper range needs to be labeled as textual, because it
is used by virtually all ASCII extensions. In particular, this range is
used for encoding non-Latin scripts.
Since there is no counting involved, other than simply observing the
presence or the absence of some byte values, the algorithm produces
consistent results, regardless what alphabet encoding is being used.
(If counting were involved, it could be possible to obtain different
results on a text encoded, say, using ISO-8859-16 versus UTF-8.)
There is an extra category of plain text files that are "polluted" with
one or more block-listed codes, either by mistake or by peculiar design
considerations. In such cases, a scheme that tolerates a small fraction
of block-listed codes would provide an increased recall (i.e. more true
positives). This, however, incurs a reduced precision overall, since
false positives are more likely to appear in binary files that contain
large chunks of textual data. Furthermore, "polluted" plain text should
be regarded as binary by general-purpose text detection schemes, because
general-purpose text processing algorithms might not be applicable.
Under this premise, it is safe to say that our detection method provides
a near-100% recall.
Experiments have been run on many files coming from various platforms
and applications. We tried plain text files, system logs, source code,
formatted office documents, compiled object code, etc. The results
confirm the optimistic assumptions about the capabilities of this
algorithm.
--
Cosmin Truta
Last updated: 2006-May-28

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This directory contains examples of the use of zlib and other relevant
programs and documentation.
enough.c
calculation and justification of ENOUGH parameter in inftrees.h
- calculates the maximum table space used in inflate tree
construction over all possible Huffman codes
fitblk.c
compress just enough input to nearly fill a requested output size
- zlib isn't designed to do this, but fitblk does it anyway
gun.c
uncompress a gzip file
- illustrates the use of inflateBack() for high speed file-to-file
decompression using call-back functions
- is approximately twice as fast as gzip -d
- also provides Unix uncompress functionality, again twice as fast
gzappend.c
append to a gzip file
- illustrates the use of the Z_BLOCK flush parameter for inflate()
- illustrates the use of deflatePrime() to start at any bit
gzjoin.c
join gzip files without recalculating the crc or recompressing
- illustrates the use of the Z_BLOCK flush parameter for inflate()
- illustrates the use of crc32_combine()
gzlog.c
gzlog.h
efficiently and robustly maintain a message log file in gzip format
- illustrates use of raw deflate, Z_PARTIAL_FLUSH, deflatePrime(),
and deflateSetDictionary()
- illustrates use of a gzip header extra field
gznorm.c
normalize a gzip file by combining members into a single member
- demonstrates how to concatenate deflate streams using Z_BLOCK
zlib_how.html
painfully comprehensive description of zpipe.c (see below)
- describes in excruciating detail the use of deflate() and inflate()
zpipe.c
reads and writes zlib streams from stdin to stdout
- illustrates the proper use of deflate() and inflate()
- deeply commented in zlib_how.html (see above)
zran.c
zran.h
index a zlib or gzip stream and randomly access it
- illustrates the use of Z_BLOCK, inflatePrime(), and
inflateSetDictionary() to provide random access

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/* enough.c -- determine the maximum size of inflate's Huffman code tables over
* all possible valid and complete prefix codes, subject to a length limit.
* Copyright (C) 2007, 2008, 2012, 2018 Mark Adler
* Version 1.5 5 August 2018 Mark Adler
*/
/* Version history:
1.0 3 Jan 2007 First version (derived from codecount.c version 1.4)
1.1 4 Jan 2007 Use faster incremental table usage computation
Prune examine() search on previously visited states
1.2 5 Jan 2007 Comments clean up
As inflate does, decrease root for short codes
Refuse cases where inflate would increase root
1.3 17 Feb 2008 Add argument for initial root table size
Fix bug for initial root table size == max - 1
Use a macro to compute the history index
1.4 18 Aug 2012 Avoid shifts more than bits in type (caused endless loop!)
Clean up comparisons of different types
Clean up code indentation
1.5 5 Aug 2018 Clean up code style, formatting, and comments
Show all the codes for the maximum, and only the maximum
*/
/*
Examine all possible prefix codes for a given number of symbols and a
maximum code length in bits to determine the maximum table size for zlib's
inflate. Only complete prefix codes are counted.
Two codes are considered distinct if the vectors of the number of codes per
length are not identical. So permutations of the symbol assignments result
in the same code for the counting, as do permutations of the assignments of
the bit values to the codes (i.e. only canonical codes are counted).
We build a code from shorter to longer lengths, determining how many symbols
are coded at each length. At each step, we have how many symbols remain to
be coded, what the last code length used was, and how many bit patterns of
that length remain unused. Then we add one to the code length and double the
number of unused patterns to graduate to the next code length. We then
assign all portions of the remaining symbols to that code length that
preserve the properties of a correct and eventually complete code. Those
properties are: we cannot use more bit patterns than are available; and when
all the symbols are used, there are exactly zero possible bit patterns left
unused.
The inflate Huffman decoding algorithm uses two-level lookup tables for
speed. There is a single first-level table to decode codes up to root bits
in length (root == 9 for literal/length codes and root == 6 for distance
codes, in the current inflate implementation). The base table has 1 << root
entries and is indexed by the next root bits of input. Codes shorter than
root bits have replicated table entries, so that the correct entry is
pointed to regardless of the bits that follow the short code. If the code is
longer than root bits, then the table entry points to a second-level table.
The size of that table is determined by the longest code with that root-bit
prefix. If that longest code has length len, then the table has size 1 <<
(len - root), to index the remaining bits in that set of codes. Each
subsequent root-bit prefix then has its own sub-table. The total number of
table entries required by the code is calculated incrementally as the number
of codes at each bit length is populated. When all of the codes are shorter
than root bits, then root is reduced to the longest code length, resulting
in a single, smaller, one-level table.
The inflate algorithm also provides for small values of root (relative to
the log2 of the number of symbols), where the shortest code has more bits
than root. In that case, root is increased to the length of the shortest
code. This program, by design, does not handle that case, so it is verified
that the number of symbols is less than 1 << (root + 1).
In order to speed up the examination (by about ten orders of magnitude for
the default arguments), the intermediate states in the build-up of a code
are remembered and previously visited branches are pruned. The memory
required for this will increase rapidly with the total number of symbols and
the maximum code length in bits. However this is a very small price to pay
for the vast speedup.
First, all of the possible prefix codes are counted, and reachable
intermediate states are noted by a non-zero count in a saved-results array.
Second, the intermediate states that lead to (root + 1) bit or longer codes
are used to look at all sub-codes from those junctures for their inflate
memory usage. (The amount of memory used is not affected by the number of
codes of root bits or less in length.) Third, the visited states in the
construction of those sub-codes and the associated calculation of the table
size is recalled in order to avoid recalculating from the same juncture.
Beginning the code examination at (root + 1) bit codes, which is enabled by
identifying the reachable nodes, accounts for about six of the orders of
magnitude of improvement for the default arguments. About another four
orders of magnitude come from not revisiting previous states. Out of
approximately 2x10^16 possible prefix codes, only about 2x10^6 sub-codes
need to be examined to cover all of the possible table memory usage cases
for the default arguments of 286 symbols limited to 15-bit codes.
Note that the uintmax_t type is used for counting. It is quite easy to
exceed the capacity of an eight-byte integer with a large number of symbols
and a large maximum code length, so multiple-precision arithmetic would need
to replace the integer arithmetic in that case. This program will abort if
an overflow occurs. The big_t type identifies where the counting takes
place.
The uintmax_t type is also used for calculating the number of possible codes
remaining at the maximum length. This limits the maximum code length to the
number of bits in a long long minus the number of bits needed to represent
the symbols in a flat code. The code_t type identifies where the bit-pattern
counting takes place.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <stdint.h>
#include <assert.h>
#define local static
// Special data types.
typedef uintmax_t big_t; // type for code counting
#define PRIbig "ju" // printf format for big_t
typedef uintmax_t code_t; // type for bit pattern counting
struct tab { // type for been-here check
size_t len; // allocated length of bit vector in octets
char *vec; // allocated bit vector
};
/* The array for saving results, num[], is indexed with this triplet:
syms: number of symbols remaining to code
left: number of available bit patterns at length len
len: number of bits in the codes currently being assigned
Those indices are constrained thusly when saving results:
syms: 3..totsym (totsym == total symbols to code)
left: 2..syms - 1, but only the evens (so syms == 8 -> 2, 4, 6)
len: 1..max - 1 (max == maximum code length in bits)
syms == 2 is not saved since that immediately leads to a single code. left
must be even, since it represents the number of available bit patterns at
the current length, which is double the number at the previous length. left
ends at syms-1 since left == syms immediately results in a single code.
(left > sym is not allowed since that would result in an incomplete code.)
len is less than max, since the code completes immediately when len == max.
The offset into the array is calculated for the three indices with the first
one (syms) being outermost, and the last one (len) being innermost. We build
the array with length max-1 lists for the len index, with syms-3 of those
for each symbol. There are totsym-2 of those, with each one varying in
length as a function of sym. See the calculation of index in map() for the
index, and the calculation of size in main() for the size of the array.
For the deflate example of 286 symbols limited to 15-bit codes, the array
has 284,284 entries, taking up 2.17 MB for an 8-byte big_t. More than half
of the space allocated for saved results is actually used -- not all
possible triplets are reached in the generation of valid prefix codes.
*/
/* The array for tracking visited states, done[], is itself indexed identically
to the num[] array as described above for the (syms, left, len) triplet.
Each element in the array is further indexed by the (mem, rem) doublet,
where mem is the amount of inflate table space used so far, and rem is the
remaining unused entries in the current inflate sub-table. Each indexed
element is simply one bit indicating whether the state has been visited or
not. Since the ranges for mem and rem are not known a priori, each bit
vector is of a variable size, and grows as needed to accommodate the visited
states. mem and rem are used to calculate a single index in a triangular
array. Since the range of mem is expected in the default case to be about
ten times larger than the range of rem, the array is skewed to reduce the
memory usage, with eight times the range for mem than for rem. See the
calculations for offset and bit in been_here() for the details.
For the deflate example of 286 symbols limited to 15-bit codes, the bit
vectors grow to total 5.5 MB, in addition to the 4.3 MB done array itself.
*/
// Type for a variable-length, allocated string.
typedef struct {
char *str; // pointer to allocated string
size_t size; // size of allocation
size_t len; // length of string, not including terminating zero
} string_t;
// Clear a string_t.
local void string_clear(string_t *s) {
s->str[0] = 0;
s->len = 0;
}
// Initialize a string_t.
local void string_init(string_t *s) {
s->size = 16;
s->str = malloc(s->size);
assert(s->str != NULL && "out of memory");
string_clear(s);
}
// Release the allocation of a string_t.
local void string_free(string_t *s) {
free(s->str);
s->str = NULL;
s->size = 0;
s->len = 0;
}
// Save the results of printf with fmt and the subsequent argument list to s.
// Each call appends to s. The allocated space for s is increased as needed.
local void string_printf(string_t *s, char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
size_t len = s->len;
int ret = vsnprintf(s->str + len, s->size - len, fmt, ap);
assert(ret >= 0 && "out of memory");
s->len += ret;
if (s->size < s->len + 1) {
do {
s->size <<= 1;
assert(s->size != 0 && "overflow");
} while (s->size < s->len + 1);
s->str = realloc(s->str, s->size);
assert(s->str != NULL && "out of memory");
vsnprintf(s->str + len, s->size - len, fmt, ap);
}
va_end(ap);
}
// Globals to avoid propagating constants or constant pointers recursively.
struct {
int max; // maximum allowed bit length for the codes
int root; // size of base code table in bits
int large; // largest code table so far
size_t size; // number of elements in num and done
big_t tot; // total number of codes with maximum tables size
string_t out; // display of subcodes for maximum tables size
int *code; // number of symbols assigned to each bit length
big_t *num; // saved results array for code counting
struct tab *done; // states already evaluated array
} g;
// Index function for num[] and done[].
local inline size_t map(int syms, int left, int len) {
return ((size_t)((syms - 1) >> 1) * ((syms - 2) >> 1) +
(left >> 1) - 1) * (g.max - 1) +
len - 1;
}
// Free allocated space in globals.
local void cleanup(void) {
if (g.done != NULL) {
for (size_t n = 0; n < g.size; n++)
if (g.done[n].len)
free(g.done[n].vec);
g.size = 0;
free(g.done); g.done = NULL;
}
free(g.num); g.num = NULL;
free(g.code); g.code = NULL;
string_free(&g.out);
}
// Return the number of possible prefix codes using bit patterns of lengths len
// through max inclusive, coding syms symbols, with left bit patterns of length
// len unused -- return -1 if there is an overflow in the counting. Keep a
// record of previous results in num to prevent repeating the same calculation.
local big_t count(int syms, int left, int len) {
// see if only one possible code
if (syms == left)
return 1;
// note and verify the expected state
assert(syms > left && left > 0 && len < g.max);
// see if we've done this one already
size_t index = map(syms, left, len);
big_t got = g.num[index];
if (got)
return got; // we have -- return the saved result
// we need to use at least this many bit patterns so that the code won't be
// incomplete at the next length (more bit patterns than symbols)
int least = (left << 1) - syms;
if (least < 0)
least = 0;
// we can use at most this many bit patterns, lest there not be enough
// available for the remaining symbols at the maximum length (if there were
// no limit to the code length, this would become: most = left - 1)
int most = (((code_t)left << (g.max - len)) - syms) /
(((code_t)1 << (g.max - len)) - 1);
// count all possible codes from this juncture and add them up
big_t sum = 0;
for (int use = least; use <= most; use++) {
got = count(syms - use, (left - use) << 1, len + 1);
sum += got;
if (got == (big_t)-1 || sum < got) // overflow
return (big_t)-1;
}
// verify that all recursive calls are productive
assert(sum != 0);
// save the result and return it
g.num[index] = sum;
return sum;
}
// Return true if we've been here before, set to true if not. Set a bit in a
// bit vector to indicate visiting this state. Each (syms,len,left) state has a
// variable size bit vector indexed by (mem,rem). The bit vector is lengthened
// as needed to allow setting the (mem,rem) bit.
local int been_here(int syms, int left, int len, int mem, int rem) {
// point to vector for (syms,left,len), bit in vector for (mem,rem)
size_t index = map(syms, left, len);
mem -= 1 << g.root; // mem always includes the root table
mem >>= 1; // mem and rem are always even
rem >>= 1;
size_t offset = (mem >> 3) + rem;
offset = ((offset * (offset + 1)) >> 1) + rem;
int bit = 1 << (mem & 7);
// see if we've been here
size_t length = g.done[index].len;
if (offset < length && (g.done[index].vec[offset] & bit) != 0)
return 1; // done this!
// we haven't been here before -- set the bit to show we have now
// see if we need to lengthen the vector in order to set the bit
if (length <= offset) {
// if we have one already, enlarge it, zero out the appended space
char *vector;
if (length) {
do {
length <<= 1;
} while (length <= offset);
vector = realloc(g.done[index].vec, length);
assert(vector != NULL && "out of memory");
memset(vector + g.done[index].len, 0, length - g.done[index].len);
}
// otherwise we need to make a new vector and zero it out
else {
length = 16;
while (length <= offset)
length <<= 1;
vector = calloc(length, 1);
assert(vector != NULL && "out of memory");
}
// install the new vector
g.done[index].len = length;
g.done[index].vec = vector;
}
// set the bit
g.done[index].vec[offset] |= bit;
return 0;
}
// Examine all possible codes from the given node (syms, len, left). Compute
// the amount of memory required to build inflate's decoding tables, where the
// number of code structures used so far is mem, and the number remaining in
// the current sub-table is rem.
local void examine(int syms, int left, int len, int mem, int rem) {
// see if we have a complete code
if (syms == left) {
// set the last code entry
g.code[len] = left;
// complete computation of memory used by this code
while (rem < left) {
left -= rem;
rem = 1 << (len - g.root);
mem += rem;
}
assert(rem == left);
// if this is at the maximum, show the sub-code
if (mem >= g.large) {
// if this is a new maximum, update the maximum and clear out the
// printed sub-codes from the previous maximum
if (mem > g.large) {
g.large = mem;
string_clear(&g.out);
}
// compute the starting state for this sub-code
syms = 0;
left = 1 << g.max;
for (int bits = g.max; bits > g.root; bits--) {
syms += g.code[bits];
left -= g.code[bits];
assert((left & 1) == 0);
left >>= 1;
}
// print the starting state and the resulting sub-code to g.out
string_printf(&g.out, "<%u, %u, %u>:",
syms, g.root + 1, ((1 << g.root) - left) << 1);
for (int bits = g.root + 1; bits <= g.max; bits++)
if (g.code[bits])
string_printf(&g.out, " %d[%d]", g.code[bits], bits);
string_printf(&g.out, "\n");
}
// remove entries as we drop back down in the recursion
g.code[len] = 0;
return;
}
// prune the tree if we can
if (been_here(syms, left, len, mem, rem))
return;
// we need to use at least this many bit patterns so that the code won't be
// incomplete at the next length (more bit patterns than symbols)
int least = (left << 1) - syms;
if (least < 0)
least = 0;
// we can use at most this many bit patterns, lest there not be enough
// available for the remaining symbols at the maximum length (if there were
// no limit to the code length, this would become: most = left - 1)
int most = (((code_t)left << (g.max - len)) - syms) /
(((code_t)1 << (g.max - len)) - 1);
// occupy least table spaces, creating new sub-tables as needed
int use = least;
while (rem < use) {
use -= rem;
rem = 1 << (len - g.root);
mem += rem;
}
rem -= use;
// examine codes from here, updating table space as we go
for (use = least; use <= most; use++) {
g.code[len] = use;
examine(syms - use, (left - use) << 1, len + 1,
mem + (rem ? 1 << (len - g.root) : 0), rem << 1);
if (rem == 0) {
rem = 1 << (len - g.root);
mem += rem;
}
rem--;
}
// remove entries as we drop back down in the recursion
g.code[len] = 0;
}
// Look at all sub-codes starting with root + 1 bits. Look at only the valid
// intermediate code states (syms, left, len). For each completed code,
// calculate the amount of memory required by inflate to build the decoding
// tables. Find the maximum amount of memory required and show the codes that
// require that maximum.
local void enough(int syms) {
// clear code
for (int n = 0; n <= g.max; n++)
g.code[n] = 0;
// look at all (root + 1) bit and longer codes
string_clear(&g.out); // empty saved results
g.large = 1 << g.root; // base table
if (g.root < g.max) // otherwise, there's only a base table
for (int n = 3; n <= syms; n++)
for (int left = 2; left < n; left += 2) {
// look at all reachable (root + 1) bit nodes, and the
// resulting codes (complete at root + 2 or more)
size_t index = map(n, left, g.root + 1);
if (g.root + 1 < g.max && g.num[index]) // reachable node
examine(n, left, g.root + 1, 1 << g.root, 0);
// also look at root bit codes with completions at root + 1
// bits (not saved in num, since complete), just in case
if (g.num[index - 1] && n <= left << 1)
examine((n - left) << 1, (n - left) << 1, g.root + 1,
1 << g.root, 0);
}
// done
printf("maximum of %d table entries for root = %d\n", g.large, g.root);
fputs(g.out.str, stdout);
}
// Examine and show the total number of possible prefix codes for a given
// maximum number of symbols, initial root table size, and maximum code length
// in bits -- those are the command arguments in that order. The default values
// are 286, 9, and 15 respectively, for the deflate literal/length code. The
// possible codes are counted for each number of coded symbols from two to the
// maximum. The counts for each of those and the total number of codes are
// shown. The maximum number of inflate table entries is then calculated across
// all possible codes. Each new maximum number of table entries and the
// associated sub-code (starting at root + 1 == 10 bits) is shown.
//
// To count and examine prefix codes that are not length-limited, provide a
// maximum length equal to the number of symbols minus one.
//
// For the deflate literal/length code, use "enough". For the deflate distance
// code, use "enough 30 6".
int main(int argc, char **argv) {
// set up globals for cleanup()
g.code = NULL;
g.num = NULL;
g.done = NULL;
string_init(&g.out);
// get arguments -- default to the deflate literal/length code
int syms = 286;
g.root = 9;
g.max = 15;
if (argc > 1) {
syms = atoi(argv[1]);
if (argc > 2) {
g.root = atoi(argv[2]);
if (argc > 3)
g.max = atoi(argv[3]);
}
}
if (argc > 4 || syms < 2 || g.root < 1 || g.max < 1) {
fputs("invalid arguments, need: [sym >= 2 [root >= 1 [max >= 1]]]\n",
stderr);
return 1;
}
// if not restricting the code length, the longest is syms - 1
if (g.max > syms - 1)
g.max = syms - 1;
// determine the number of bits in a code_t
int bits = 0;
for (code_t word = 1; word; word <<= 1)
bits++;
// make sure that the calculation of most will not overflow
if (g.max > bits || (code_t)(syms - 2) >= ((code_t)-1 >> (g.max - 1))) {
fputs("abort: code length too long for internal types\n", stderr);
return 1;
}
// reject impossible code requests
if ((code_t)(syms - 1) > ((code_t)1 << g.max) - 1) {
fprintf(stderr, "%d symbols cannot be coded in %d bits\n",
syms, g.max);
return 1;
}
// allocate code vector
g.code = calloc(g.max + 1, sizeof(int));
assert(g.code != NULL && "out of memory");
// determine size of saved results array, checking for overflows,
// allocate and clear the array (set all to zero with calloc())
if (syms == 2) // iff max == 1
g.num = NULL; // won't be saving any results
else {
g.size = syms >> 1;
int n = (syms - 1) >> 1;
assert(g.size <= (size_t)-1 / n && "overflow");
g.size *= n;
n = g.max - 1;
assert(g.size <= (size_t)-1 / n && "overflow");
g.size *= n;
g.num = calloc(g.size, sizeof(big_t));
assert(g.num != NULL && "out of memory");
}
// count possible codes for all numbers of symbols, add up counts
big_t sum = 0;
for (int n = 2; n <= syms; n++) {
big_t got = count(n, 2, 1);
sum += got;
assert(got != (big_t)-1 && sum >= got && "overflow");
}
printf("%"PRIbig" total codes for 2 to %d symbols", sum, syms);
if (g.max < syms - 1)
printf(" (%d-bit length limit)\n", g.max);
else
puts(" (no length limit)");
// allocate and clear done array for been_here()
if (syms == 2)
g.done = NULL;
else {
g.done = calloc(g.size, sizeof(struct tab));
assert(g.done != NULL && "out of memory");
}
// find and show maximum inflate table usage
if (g.root > g.max) // reduce root to max length
g.root = g.max;
if ((code_t)syms < ((code_t)1 << (g.root + 1)))
enough(syms);
else
fputs("cannot handle minimum code lengths > root", stderr);
// done
cleanup();
return 0;
}

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/* fitblk.c: example of fitting compressed output to a specified size
Not copyrighted -- provided to the public domain
Version 1.1 25 November 2004 Mark Adler */
/* Version history:
1.0 24 Nov 2004 First version
1.1 25 Nov 2004 Change deflateInit2() to deflateInit()
Use fixed-size, stack-allocated raw buffers
Simplify code moving compression to subroutines
Use assert() for internal errors
Add detailed description of approach
*/
/* Approach to just fitting a requested compressed size:
fitblk performs three compression passes on a portion of the input
data in order to determine how much of that input will compress to
nearly the requested output block size. The first pass generates
enough deflate blocks to produce output to fill the requested
output size plus a specified excess amount (see the EXCESS define
below). The last deflate block may go quite a bit past that, but
is discarded. The second pass decompresses and recompresses just
the compressed data that fit in the requested plus excess sized
buffer. The deflate process is terminated after that amount of
input, which is less than the amount consumed on the first pass.
The last deflate block of the result will be of a comparable size
to the final product, so that the header for that deflate block and
the compression ratio for that block will be about the same as in
the final product. The third compression pass decompresses the
result of the second step, but only the compressed data up to the
requested size minus an amount to allow the compressed stream to
complete (see the MARGIN define below). That will result in a
final compressed stream whose length is less than or equal to the
requested size. Assuming sufficient input and a requested size
greater than a few hundred bytes, the shortfall will typically be
less than ten bytes.
If the input is short enough that the first compression completes
before filling the requested output size, then that compressed
stream is return with no recompression.
EXCESS is chosen to be just greater than the shortfall seen in a
two pass approach similar to the above. That shortfall is due to
the last deflate block compressing more efficiently with a smaller
header on the second pass. EXCESS is set to be large enough so
that there is enough uncompressed data for the second pass to fill
out the requested size, and small enough so that the final deflate
block of the second pass will be close in size to the final deflate
block of the third and final pass. MARGIN is chosen to be just
large enough to assure that the final compression has enough room
to complete in all cases.
*/
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include "zlib.h"
#define local static
/* print nastygram and leave */
local void quit(char *why)
{
fprintf(stderr, "fitblk abort: %s\n", why);
exit(1);
}
#define RAWLEN 4096 /* intermediate uncompressed buffer size */
/* compress from file to def until provided buffer is full or end of
input reached; return last deflate() return value, or Z_ERRNO if
there was read error on the file */
local int partcompress(FILE *in, z_streamp def)
{
int ret, flush;
unsigned char raw[RAWLEN];
flush = Z_NO_FLUSH;
do {
def->avail_in = fread(raw, 1, RAWLEN, in);
if (ferror(in))
return Z_ERRNO;
def->next_in = raw;
if (feof(in))
flush = Z_FINISH;
ret = deflate(def, flush);
assert(ret != Z_STREAM_ERROR);
} while (def->avail_out != 0 && flush == Z_NO_FLUSH);
return ret;
}
/* recompress from inf's input to def's output; the input for inf and
the output for def are set in those structures before calling;
return last deflate() return value, or Z_MEM_ERROR if inflate()
was not able to allocate enough memory when it needed to */
local int recompress(z_streamp inf, z_streamp def)
{
int ret, flush;
unsigned char raw[RAWLEN];
flush = Z_NO_FLUSH;
do {
/* decompress */
inf->avail_out = RAWLEN;
inf->next_out = raw;
ret = inflate(inf, Z_NO_FLUSH);
assert(ret != Z_STREAM_ERROR && ret != Z_DATA_ERROR &&
ret != Z_NEED_DICT);
if (ret == Z_MEM_ERROR)
return ret;
/* compress what was decompressed until done or no room */
def->avail_in = RAWLEN - inf->avail_out;
def->next_in = raw;
if (inf->avail_out != 0)
flush = Z_FINISH;
ret = deflate(def, flush);
assert(ret != Z_STREAM_ERROR);
} while (ret != Z_STREAM_END && def->avail_out != 0);
return ret;
}
#define EXCESS 256 /* empirically determined stream overage */
#define MARGIN 8 /* amount to back off for completion */
/* compress from stdin to fixed-size block on stdout */
int main(int argc, char **argv)
{
int ret; /* return code */
unsigned size; /* requested fixed output block size */
unsigned have; /* bytes written by deflate() call */
unsigned char *blk; /* intermediate and final stream */
unsigned char *tmp; /* close to desired size stream */
z_stream def, inf; /* zlib deflate and inflate states */
/* get requested output size */
if (argc != 2)
quit("need one argument: size of output block");
ret = strtol(argv[1], argv + 1, 10);
if (argv[1][0] != 0)
quit("argument must be a number");
if (ret < 8) /* 8 is minimum zlib stream size */
quit("need positive size of 8 or greater");
size = (unsigned)ret;
/* allocate memory for buffers and compression engine */
blk = malloc(size + EXCESS);
def.zalloc = Z_NULL;
def.zfree = Z_NULL;
def.opaque = Z_NULL;
ret = deflateInit(&def, Z_DEFAULT_COMPRESSION);
if (ret != Z_OK || blk == NULL)
quit("out of memory");
/* compress from stdin until output full, or no more input */
def.avail_out = size + EXCESS;
def.next_out = blk;
ret = partcompress(stdin, &def);
if (ret == Z_ERRNO)
quit("error reading input");
/* if it all fit, then size was undersubscribed -- done! */
if (ret == Z_STREAM_END && def.avail_out >= EXCESS) {
/* write block to stdout */
have = size + EXCESS - def.avail_out;
if (fwrite(blk, 1, have, stdout) != have || ferror(stdout))
quit("error writing output");
/* clean up and print results to stderr */
ret = deflateEnd(&def);
assert(ret != Z_STREAM_ERROR);
free(blk);
fprintf(stderr,
"%u bytes unused out of %u requested (all input)\n",
size - have, size);
return 0;
}
/* it didn't all fit -- set up for recompression */
inf.zalloc = Z_NULL;
inf.zfree = Z_NULL;
inf.opaque = Z_NULL;
inf.avail_in = 0;
inf.next_in = Z_NULL;
ret = inflateInit(&inf);
tmp = malloc(size + EXCESS);
if (ret != Z_OK || tmp == NULL)
quit("out of memory");
ret = deflateReset(&def);
assert(ret != Z_STREAM_ERROR);
/* do first recompression close to the right amount */
inf.avail_in = size + EXCESS;
inf.next_in = blk;
def.avail_out = size + EXCESS;
def.next_out = tmp;
ret = recompress(&inf, &def);
if (ret == Z_MEM_ERROR)
quit("out of memory");
/* set up for next reocmpression */
ret = inflateReset(&inf);
assert(ret != Z_STREAM_ERROR);
ret = deflateReset(&def);
assert(ret != Z_STREAM_ERROR);
/* do second and final recompression (third compression) */
inf.avail_in = size - MARGIN; /* assure stream will complete */
inf.next_in = tmp;
def.avail_out = size;
def.next_out = blk;
ret = recompress(&inf, &def);
if (ret == Z_MEM_ERROR)
quit("out of memory");
assert(ret == Z_STREAM_END); /* otherwise MARGIN too small */
/* done -- write block to stdout */
have = size - def.avail_out;
if (fwrite(blk, 1, have, stdout) != have || ferror(stdout))
quit("error writing output");
/* clean up and print results to stderr */
free(tmp);
ret = inflateEnd(&inf);
assert(ret != Z_STREAM_ERROR);
ret = deflateEnd(&def);
assert(ret != Z_STREAM_ERROR);
free(blk);
fprintf(stderr,
"%u bytes unused out of %u requested (%lu input)\n",
size - have, size, def.total_in);
return 0;
}

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/* gun.c -- simple gunzip to give an example of the use of inflateBack()
* Copyright (C) 2003, 2005, 2008, 2010, 2012 Mark Adler
* For conditions of distribution and use, see copyright notice in zlib.h
Version 1.7 12 August 2012 Mark Adler */
/* Version history:
1.0 16 Feb 2003 First version for testing of inflateBack()
1.1 21 Feb 2005 Decompress concatenated gzip streams
Remove use of "this" variable (C++ keyword)
Fix return value for in()
Improve allocation failure checking
Add typecasting for void * structures
Add -h option for command version and usage
Add a bunch of comments
1.2 20 Mar 2005 Add Unix compress (LZW) decompression
Copy file attributes from input file to output file
1.3 12 Jun 2005 Add casts for error messages [Oberhumer]
1.4 8 Dec 2006 LZW decompression speed improvements
1.5 9 Feb 2008 Avoid warning in latest version of gcc
1.6 17 Jan 2010 Avoid signed/unsigned comparison warnings
1.7 12 Aug 2012 Update for z_const usage in zlib 1.2.8
*/
/*
gun [ -t ] [ name ... ]
decompresses the data in the named gzip files. If no arguments are given,
gun will decompress from stdin to stdout. The names must end in .gz, -gz,
.z, -z, _z, or .Z. The uncompressed data will be written to a file name
with the suffix stripped. On success, the original file is deleted. On
failure, the output file is deleted. For most failures, the command will
continue to process the remaining names on the command line. A memory
allocation failure will abort the command. If -t is specified, then the
listed files or stdin will be tested as gzip files for integrity (without
checking for a proper suffix), no output will be written, and no files
will be deleted.
Like gzip, gun allows concatenated gzip streams and will decompress them,
writing all of the uncompressed data to the output. Unlike gzip, gun allows
an empty file on input, and will produce no error writing an empty output
file.
gun will also decompress files made by Unix compress, which uses LZW
compression. These files are automatically detected by virtue of their
magic header bytes. Since the end of Unix compress stream is marked by the
end-of-file, they cannot be concatenated. If a Unix compress stream is
encountered in an input file, it is the last stream in that file.
Like gunzip and uncompress, the file attributes of the original compressed
file are maintained in the final uncompressed file, to the extent that the
user permissions allow it.
On my Mac OS X PowerPC G4, gun is almost twice as fast as gunzip (version
1.2.4) is on the same file, when gun is linked with zlib 1.2.2. Also the
LZW decompression provided by gun is about twice as fast as the standard
Unix uncompress command.
*/
/* external functions and related types and constants */
#include <stdio.h> /* fprintf() */
#include <stdlib.h> /* malloc(), free() */
#include <string.h> /* strerror(), strcmp(), strlen(), memcpy() */
#include <errno.h> /* errno */
#include <fcntl.h> /* open() */
#include <unistd.h> /* read(), write(), close(), chown(), unlink() */
#include <sys/types.h>
#include <sys/stat.h> /* stat(), chmod() */
#include <utime.h> /* utime() */
#include "zlib.h" /* inflateBackInit(), inflateBack(), */
/* inflateBackEnd(), crc32() */
/* function declaration */
#define local static
/* buffer constants */
#define SIZE 32768U /* input and output buffer sizes */
#define PIECE 16384 /* limits i/o chunks for 16-bit int case */
/* structure for infback() to pass to input function in() -- it maintains the
input file and a buffer of size SIZE */
struct ind {
int infile;
unsigned char *inbuf;
};
/* Load input buffer, assumed to be empty, and return bytes loaded and a
pointer to them. read() is called until the buffer is full, or until it
returns end-of-file or error. Return 0 on error. */
local unsigned in(void *in_desc, z_const unsigned char **buf)
{
int ret;
unsigned len;
unsigned char *next;
struct ind *me = (struct ind *)in_desc;
next = me->inbuf;
*buf = next;
len = 0;
do {
ret = PIECE;
if ((unsigned)ret > SIZE - len)
ret = (int)(SIZE - len);
ret = (int)read(me->infile, next, ret);
if (ret == -1) {
len = 0;
break;
}
next += ret;
len += ret;
} while (ret != 0 && len < SIZE);
return len;
}
/* structure for infback() to pass to output function out() -- it maintains the
output file, a running CRC-32 check on the output and the total number of
bytes output, both for checking against the gzip trailer. (The length in
the gzip trailer is stored modulo 2^32, so it's ok if a long is 32 bits and
the output is greater than 4 GB.) */
struct outd {
int outfile;
int check; /* true if checking crc and total */
unsigned long crc;
unsigned long total;
};
/* Write output buffer and update the CRC-32 and total bytes written. write()
is called until all of the output is written or an error is encountered.
On success out() returns 0. For a write failure, out() returns 1. If the
output file descriptor is -1, then nothing is written.
*/
local int out(void *out_desc, unsigned char *buf, unsigned len)
{
int ret;
struct outd *me = (struct outd *)out_desc;
if (me->check) {
me->crc = crc32(me->crc, buf, len);
me->total += len;
}
if (me->outfile != -1)
do {
ret = PIECE;
if ((unsigned)ret > len)
ret = (int)len;
ret = (int)write(me->outfile, buf, ret);
if (ret == -1)
return 1;
buf += ret;
len -= ret;
} while (len != 0);
return 0;
}
/* next input byte macro for use inside lunpipe() and gunpipe() */
#define NEXT() (have ? 0 : (have = in(indp, &next)), \
last = have ? (have--, (int)(*next++)) : -1)
/* memory for gunpipe() and lunpipe() --
the first 256 entries of prefix[] and suffix[] are never used, could
have offset the index, but it's faster to waste the memory */
unsigned char inbuf[SIZE]; /* input buffer */
unsigned char outbuf[SIZE]; /* output buffer */
unsigned short prefix[65536]; /* index to LZW prefix string */
unsigned char suffix[65536]; /* one-character LZW suffix */
unsigned char match[65280 + 2]; /* buffer for reversed match or gzip
32K sliding window */
/* throw out what's left in the current bits byte buffer (this is a vestigial
aspect of the compressed data format derived from an implementation that
made use of a special VAX machine instruction!) */
#define FLUSHCODE() \
do { \
left = 0; \
rem = 0; \
if (chunk > have) { \
chunk -= have; \
have = 0; \
if (NEXT() == -1) \
break; \
chunk--; \
if (chunk > have) { \
chunk = have = 0; \
break; \
} \
} \
have -= chunk; \
next += chunk; \
chunk = 0; \
} while (0)
/* Decompress a compress (LZW) file from indp to outfile. The compress magic
header (two bytes) has already been read and verified. There are have bytes
of buffered input at next. strm is used for passing error information back
to gunpipe().
lunpipe() will return Z_OK on success, Z_BUF_ERROR for an unexpected end of
file, read error, or write error (a write error indicated by strm->next_in
not equal to Z_NULL), or Z_DATA_ERROR for invalid input.
*/
local int lunpipe(unsigned have, z_const unsigned char *next, struct ind *indp,
int outfile, z_stream *strm)
{
int last; /* last byte read by NEXT(), or -1 if EOF */
unsigned chunk; /* bytes left in current chunk */
int left; /* bits left in rem */
unsigned rem; /* unused bits from input */
int bits; /* current bits per code */
unsigned code; /* code, table traversal index */
unsigned mask; /* mask for current bits codes */
int max; /* maximum bits per code for this stream */
unsigned flags; /* compress flags, then block compress flag */
unsigned end; /* last valid entry in prefix/suffix tables */
unsigned temp; /* current code */
unsigned prev; /* previous code */
unsigned final; /* last character written for previous code */
unsigned stack; /* next position for reversed string */
unsigned outcnt; /* bytes in output buffer */
struct outd outd; /* output structure */
unsigned char *p;
/* set up output */
outd.outfile = outfile;
outd.check = 0;
/* process remainder of compress header -- a flags byte */
flags = NEXT();
if (last == -1)
return Z_BUF_ERROR;
if (flags & 0x60) {
strm->msg = (char *)"unknown lzw flags set";
return Z_DATA_ERROR;
}
max = flags & 0x1f;
if (max < 9 || max > 16) {
strm->msg = (char *)"lzw bits out of range";
return Z_DATA_ERROR;
}
if (max == 9) /* 9 doesn't really mean 9 */
max = 10;
flags &= 0x80; /* true if block compress */
/* clear table */
bits = 9;
mask = 0x1ff;
end = flags ? 256 : 255;
/* set up: get first 9-bit code, which is the first decompressed byte, but
don't create a table entry until the next code */
if (NEXT() == -1) /* no compressed data is ok */
return Z_OK;
final = prev = (unsigned)last; /* low 8 bits of code */
if (NEXT() == -1) /* missing a bit */
return Z_BUF_ERROR;
if (last & 1) { /* code must be < 256 */
strm->msg = (char *)"invalid lzw code";
return Z_DATA_ERROR;
}
rem = (unsigned)last >> 1; /* remaining 7 bits */
left = 7;
chunk = bits - 2; /* 7 bytes left in this chunk */
outbuf[0] = (unsigned char)final; /* write first decompressed byte */
outcnt = 1;
/* decode codes */
stack = 0;
for (;;) {
/* if the table will be full after this, increment the code size */
if (end >= mask && bits < max) {
FLUSHCODE();
bits++;
mask <<= 1;
mask++;
}
/* get a code of length bits */
if (chunk == 0) /* decrement chunk modulo bits */
chunk = bits;
code = rem; /* low bits of code */
if (NEXT() == -1) { /* EOF is end of compressed data */
/* write remaining buffered output */
if (outcnt && out(&outd, outbuf, outcnt)) {
strm->next_in = outbuf; /* signal write error */
return Z_BUF_ERROR;
}
return Z_OK;
}
code += (unsigned)last << left; /* middle (or high) bits of code */
left += 8;
chunk--;
if (bits > left) { /* need more bits */
if (NEXT() == -1) /* can't end in middle of code */
return Z_BUF_ERROR;
code += (unsigned)last << left; /* high bits of code */
left += 8;
chunk--;
}
code &= mask; /* mask to current code length */
left -= bits; /* number of unused bits */
rem = (unsigned)last >> (8 - left); /* unused bits from last byte */
/* process clear code (256) */
if (code == 256 && flags) {
FLUSHCODE();
bits = 9; /* initialize bits and mask */
mask = 0x1ff;
end = 255; /* empty table */
continue; /* get next code */
}
/* special code to reuse last match */
temp = code; /* save the current code */
if (code > end) {
/* Be picky on the allowed code here, and make sure that the code
we drop through (prev) will be a valid index so that random
input does not cause an exception. The code != end + 1 check is
empirically derived, and not checked in the original uncompress
code. If this ever causes a problem, that check could be safely
removed. Leaving this check in greatly improves gun's ability
to detect random or corrupted input after a compress header.
In any case, the prev > end check must be retained. */
if (code != end + 1 || prev > end) {
strm->msg = (char *)"invalid lzw code";
return Z_DATA_ERROR;
}
match[stack++] = (unsigned char)final;
code = prev;
}
/* walk through linked list to generate output in reverse order */
p = match + stack;
while (code >= 256) {
*p++ = suffix[code];
code = prefix[code];
}
stack = p - match;
match[stack++] = (unsigned char)code;
final = code;
/* link new table entry */
if (end < mask) {
end++;
prefix[end] = (unsigned short)prev;
suffix[end] = (unsigned char)final;
}
/* set previous code for next iteration */
prev = temp;
/* write output in forward order */
while (stack > SIZE - outcnt) {
while (outcnt < SIZE)
outbuf[outcnt++] = match[--stack];
if (out(&outd, outbuf, outcnt)) {
strm->next_in = outbuf; /* signal write error */
return Z_BUF_ERROR;
}
outcnt = 0;
}
p = match + stack;
do {
outbuf[outcnt++] = *--p;
} while (p > match);
stack = 0;
/* loop for next code with final and prev as the last match, rem and
left provide the first 0..7 bits of the next code, end is the last
valid table entry */
}
}
/* Decompress a gzip file from infile to outfile. strm is assumed to have been
successfully initialized with inflateBackInit(). The input file may consist
of a series of gzip streams, in which case all of them will be decompressed
to the output file. If outfile is -1, then the gzip stream(s) integrity is
checked and nothing is written.
The return value is a zlib error code: Z_MEM_ERROR if out of memory,
Z_DATA_ERROR if the header or the compressed data is invalid, or if the
trailer CRC-32 check or length doesn't match, Z_BUF_ERROR if the input ends
prematurely or a write error occurs, or Z_ERRNO if junk (not a another gzip
stream) follows a valid gzip stream.
*/
local int gunpipe(z_stream *strm, int infile, int outfile)
{
int ret, first, last;
unsigned have, flags, len;
z_const unsigned char *next = NULL;
struct ind ind, *indp;
struct outd outd;
/* setup input buffer */
ind.infile = infile;
ind.inbuf = inbuf;
indp = &ind;
/* decompress concatenated gzip streams */
have = 0; /* no input data read in yet */
first = 1; /* looking for first gzip header */
strm->next_in = Z_NULL; /* so Z_BUF_ERROR means EOF */
for (;;) {
/* look for the two magic header bytes for a gzip stream */
if (NEXT() == -1) {
ret = Z_OK;
break; /* empty gzip stream is ok */
}
if (last != 31 || (NEXT() != 139 && last != 157)) {
strm->msg = (char *)"incorrect header check";
ret = first ? Z_DATA_ERROR : Z_ERRNO;
break; /* not a gzip or compress header */
}
first = 0; /* next non-header is junk */
/* process a compress (LZW) file -- can't be concatenated after this */
if (last == 157) {
ret = lunpipe(have, next, indp, outfile, strm);
break;
}
/* process remainder of gzip header */
ret = Z_BUF_ERROR;
if (NEXT() != 8) { /* only deflate method allowed */
if (last == -1) break;
strm->msg = (char *)"unknown compression method";
ret = Z_DATA_ERROR;
break;
}
flags = NEXT(); /* header flags */
NEXT(); /* discard mod time, xflgs, os */
NEXT();
NEXT();
NEXT();
NEXT();
NEXT();
if (last == -1) break;
if (flags & 0xe0) {
strm->msg = (char *)"unknown header flags set";
ret = Z_DATA_ERROR;
break;
}
if (flags & 4) { /* extra field */
len = NEXT();
len += (unsigned)(NEXT()) << 8;
if (last == -1) break;
while (len > have) {
len -= have;
have = 0;
if (NEXT() == -1) break;
len--;
}
if (last == -1) break;
have -= len;
next += len;
}
if (flags & 8) /* file name */
while (NEXT() != 0 && last != -1)
;
if (flags & 16) /* comment */
while (NEXT() != 0 && last != -1)
;
if (flags & 2) { /* header crc */
NEXT();
NEXT();
}
if (last == -1) break;
/* set up output */
outd.outfile = outfile;
outd.check = 1;
outd.crc = crc32(0L, Z_NULL, 0);
outd.total = 0;
/* decompress data to output */
strm->next_in = next;
strm->avail_in = have;
ret = inflateBack(strm, in, indp, out, &outd);
if (ret != Z_STREAM_END) break;
next = strm->next_in;
have = strm->avail_in;
strm->next_in = Z_NULL; /* so Z_BUF_ERROR means EOF */
/* check trailer */
ret = Z_BUF_ERROR;
if (NEXT() != (int)(outd.crc & 0xff) ||
NEXT() != (int)((outd.crc >> 8) & 0xff) ||
NEXT() != (int)((outd.crc >> 16) & 0xff) ||
NEXT() != (int)((outd.crc >> 24) & 0xff)) {
/* crc error */
if (last != -1) {
strm->msg = (char *)"incorrect data check";
ret = Z_DATA_ERROR;
}
break;
}
if (NEXT() != (int)(outd.total & 0xff) ||
NEXT() != (int)((outd.total >> 8) & 0xff) ||
NEXT() != (int)((outd.total >> 16) & 0xff) ||
NEXT() != (int)((outd.total >> 24) & 0xff)) {
/* length error */
if (last != -1) {
strm->msg = (char *)"incorrect length check";
ret = Z_DATA_ERROR;
}
break;
}
/* go back and look for another gzip stream */
}
/* clean up and return */
return ret;
}
/* Copy file attributes, from -> to, as best we can. This is best effort, so
no errors are reported. The mode bits, including suid, sgid, and the sticky
bit are copied (if allowed), the owner's user id and group id are copied
(again if allowed), and the access and modify times are copied. */
local void copymeta(char *from, char *to)
{
struct stat was;
struct utimbuf when;
/* get all of from's Unix meta data, return if not a regular file */
if (stat(from, &was) != 0 || (was.st_mode & S_IFMT) != S_IFREG)
return;
/* set to's mode bits, ignore errors */
(void)chmod(to, was.st_mode & 07777);
/* copy owner's user and group, ignore errors */
(void)chown(to, was.st_uid, was.st_gid);
/* copy access and modify times, ignore errors */
when.actime = was.st_atime;
when.modtime = was.st_mtime;
(void)utime(to, &when);
}
/* Decompress the file inname to the file outnname, of if test is true, just
decompress without writing and check the gzip trailer for integrity. If
inname is NULL or an empty string, read from stdin. If outname is NULL or
an empty string, write to stdout. strm is a pre-initialized inflateBack
structure. When appropriate, copy the file attributes from inname to
outname.
gunzip() returns 1 if there is an out-of-memory error or an unexpected
return code from gunpipe(). Otherwise it returns 0.
*/
local int gunzip(z_stream *strm, char *inname, char *outname, int test)
{
int ret;
int infile, outfile;
/* open files */
if (inname == NULL || *inname == 0) {
inname = "-";
infile = 0; /* stdin */
}
else {
infile = open(inname, O_RDONLY, 0);
if (infile == -1) {
fprintf(stderr, "gun cannot open %s\n", inname);
return 0;
}
}
if (test)
outfile = -1;
else if (outname == NULL || *outname == 0) {
outname = "-";
outfile = 1; /* stdout */
}
else {
outfile = open(outname, O_CREAT | O_TRUNC | O_WRONLY, 0666);
if (outfile == -1) {
close(infile);
fprintf(stderr, "gun cannot create %s\n", outname);
return 0;
}
}
errno = 0;
/* decompress */
ret = gunpipe(strm, infile, outfile);
if (outfile > 2) close(outfile);
if (infile > 2) close(infile);
/* interpret result */
switch (ret) {
case Z_OK:
case Z_ERRNO:
if (infile > 2 && outfile > 2) {
copymeta(inname, outname); /* copy attributes */
unlink(inname);
}
if (ret == Z_ERRNO)
fprintf(stderr, "gun warning: trailing garbage ignored in %s\n",
inname);
break;
case Z_DATA_ERROR:
if (outfile > 2) unlink(outname);
fprintf(stderr, "gun data error on %s: %s\n", inname, strm->msg);
break;
case Z_MEM_ERROR:
if (outfile > 2) unlink(outname);
fprintf(stderr, "gun out of memory error--aborting\n");
return 1;
case Z_BUF_ERROR:
if (outfile > 2) unlink(outname);
if (strm->next_in != Z_NULL) {
fprintf(stderr, "gun write error on %s: %s\n",
outname, strerror(errno));
}
else if (errno) {
fprintf(stderr, "gun read error on %s: %s\n",
inname, strerror(errno));
}
else {
fprintf(stderr, "gun unexpected end of file on %s\n",
inname);
}
break;
default:
if (outfile > 2) unlink(outname);
fprintf(stderr, "gun internal error--aborting\n");
return 1;
}
return 0;
}
/* Process the gun command line arguments. See the command syntax near the
beginning of this source file. */
int main(int argc, char **argv)
{
int ret, len, test;
char *outname;
unsigned char *window;
z_stream strm;
/* initialize inflateBack state for repeated use */
window = match; /* reuse LZW match buffer */
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
ret = inflateBackInit(&strm, 15, window);
if (ret != Z_OK) {
fprintf(stderr, "gun out of memory error--aborting\n");
return 1;
}
/* decompress each file to the same name with the suffix removed */
argc--;
argv++;
test = 0;
if (argc && strcmp(*argv, "-h") == 0) {
fprintf(stderr, "gun 1.6 (17 Jan 2010)\n");
fprintf(stderr, "Copyright (C) 2003-2010 Mark Adler\n");
fprintf(stderr, "usage: gun [-t] [file1.gz [file2.Z ...]]\n");
return 0;
}
if (argc && strcmp(*argv, "-t") == 0) {
test = 1;
argc--;
argv++;
}
if (argc)
do {
if (test)
outname = NULL;
else {
len = (int)strlen(*argv);
if (strcmp(*argv + len - 3, ".gz") == 0 ||
strcmp(*argv + len - 3, "-gz") == 0)
len -= 3;
else if (strcmp(*argv + len - 2, ".z") == 0 ||
strcmp(*argv + len - 2, "-z") == 0 ||
strcmp(*argv + len - 2, "_z") == 0 ||
strcmp(*argv + len - 2, ".Z") == 0)
len -= 2;
else {
fprintf(stderr, "gun error: no gz type on %s--skipping\n",
*argv);
continue;
}
outname = malloc(len + 1);
if (outname == NULL) {
fprintf(stderr, "gun out of memory error--aborting\n");
ret = 1;
break;
}
memcpy(outname, *argv, len);
outname[len] = 0;
}
ret = gunzip(&strm, *argv, outname, test);
if (outname != NULL) free(outname);
if (ret) break;
} while (argv++, --argc);
else
ret = gunzip(&strm, NULL, NULL, test);
/* clean up */
inflateBackEnd(&strm);
return ret;
}

504
libz/examples/gzappend.c Normal file
View File

@@ -0,0 +1,504 @@
/* gzappend -- command to append to a gzip file
Copyright (C) 2003, 2012 Mark Adler, all rights reserved
version 1.2, 11 Oct 2012
This software is provided 'as-is', without any express or implied
warranty. In no event will the author be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
Mark Adler madler@alumni.caltech.edu
*/
/*
* Change history:
*
* 1.0 19 Oct 2003 - First version
* 1.1 4 Nov 2003 - Expand and clarify some comments and notes
* - Add version and copyright to help
* - Send help to stdout instead of stderr
* - Add some preemptive typecasts
* - Add L to constants in lseek() calls
* - Remove some debugging information in error messages
* - Use new data_type definition for zlib 1.2.1
* - Simplify and unify file operations
* - Finish off gzip file in gztack()
* - Use deflatePrime() instead of adding empty blocks
* - Keep gzip file clean on appended file read errors
* - Use in-place rotate instead of auxiliary buffer
* (Why you ask? Because it was fun to write!)
* 1.2 11 Oct 2012 - Fix for proper z_const usage
* - Check for input buffer malloc failure
*/
/*
gzappend takes a gzip file and appends to it, compressing files from the
command line or data from stdin. The gzip file is written to directly, to
avoid copying that file, in case it's large. Note that this results in the
unfriendly behavior that if gzappend fails, the gzip file is corrupted.
This program was written to illustrate the use of the new Z_BLOCK option of
zlib 1.2.x's inflate() function. This option returns from inflate() at each
block boundary to facilitate locating and modifying the last block bit at
the start of the final deflate block. Also whether using Z_BLOCK or not,
another required feature of zlib 1.2.x is that inflate() now provides the
number of unused bits in the last input byte used. gzappend will not work
with versions of zlib earlier than 1.2.1.
gzappend first decompresses the gzip file internally, discarding all but
the last 32K of uncompressed data, and noting the location of the last block
bit and the number of unused bits in the last byte of the compressed data.
The gzip trailer containing the CRC-32 and length of the uncompressed data
is verified. This trailer will be later overwritten.
Then the last block bit is cleared by seeking back in the file and rewriting
the byte that contains it. Seeking forward, the last byte of the compressed
data is saved along with the number of unused bits to initialize deflate.
A deflate process is initialized, using the last 32K of the uncompressed
data from the gzip file to initialize the dictionary. If the total
uncompressed data was less than 32K, then all of it is used to initialize
the dictionary. The deflate output bit buffer is also initialized with the
last bits from the original deflate stream. From here on, the data to
append is simply compressed using deflate, and written to the gzip file.
When that is complete, the new CRC-32 and uncompressed length are written
as the trailer of the gzip file.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include "zlib.h"
#define local static
#define LGCHUNK 14
#define CHUNK (1U << LGCHUNK)
#define DSIZE 32768U
/* print an error message and terminate with extreme prejudice */
local void bye(char *msg1, char *msg2)
{
fprintf(stderr, "gzappend error: %s%s\n", msg1, msg2);
exit(1);
}
/* return the greatest common divisor of a and b using Euclid's algorithm,
modified to be fast when one argument much greater than the other, and
coded to avoid unnecessary swapping */
local unsigned gcd(unsigned a, unsigned b)
{
unsigned c;
while (a && b)
if (a > b) {
c = b;
while (a - c >= c)
c <<= 1;
a -= c;
}
else {
c = a;
while (b - c >= c)
c <<= 1;
b -= c;
}
return a + b;
}
/* rotate list[0..len-1] left by rot positions, in place */
local void rotate(unsigned char *list, unsigned len, unsigned rot)
{
unsigned char tmp;
unsigned cycles;
unsigned char *start, *last, *to, *from;
/* normalize rot and handle degenerate cases */
if (len < 2) return;
if (rot >= len) rot %= len;
if (rot == 0) return;
/* pointer to last entry in list */
last = list + (len - 1);
/* do simple left shift by one */
if (rot == 1) {
tmp = *list;
memmove(list, list + 1, len - 1);
*last = tmp;
return;
}
/* do simple right shift by one */
if (rot == len - 1) {
tmp = *last;
memmove(list + 1, list, len - 1);
*list = tmp;
return;
}
/* otherwise do rotate as a set of cycles in place */
cycles = gcd(len, rot); /* number of cycles */
do {
start = from = list + cycles; /* start index is arbitrary */
tmp = *from; /* save entry to be overwritten */
for (;;) {
to = from; /* next step in cycle */
from += rot; /* go right rot positions */
if (from > last) from -= len; /* (pointer better not wrap) */
if (from == start) break; /* all but one shifted */
*to = *from; /* shift left */
}
*to = tmp; /* complete the circle */
} while (--cycles);
}
/* structure for gzip file read operations */
typedef struct {
int fd; /* file descriptor */
int size; /* 1 << size is bytes in buf */
unsigned left; /* bytes available at next */
unsigned char *buf; /* buffer */
z_const unsigned char *next; /* next byte in buffer */
char *name; /* file name for error messages */
} file;
/* reload buffer */
local int readin(file *in)
{
int len;
len = read(in->fd, in->buf, 1 << in->size);
if (len == -1) bye("error reading ", in->name);
in->left = (unsigned)len;
in->next = in->buf;
return len;
}
/* read from file in, exit if end-of-file */
local int readmore(file *in)
{
if (readin(in) == 0) bye("unexpected end of ", in->name);
return 0;
}
#define read1(in) (in->left == 0 ? readmore(in) : 0, \
in->left--, *(in->next)++)
/* skip over n bytes of in */
local void skip(file *in, unsigned n)
{
unsigned bypass;
if (n > in->left) {
n -= in->left;
bypass = n & ~((1U << in->size) - 1);
if (bypass) {
if (lseek(in->fd, (off_t)bypass, SEEK_CUR) == -1)
bye("seeking ", in->name);
n -= bypass;
}
readmore(in);
if (n > in->left)
bye("unexpected end of ", in->name);
}
in->left -= n;
in->next += n;
}
/* read a four-byte unsigned integer, little-endian, from in */
unsigned long read4(file *in)
{
unsigned long val;
val = read1(in);
val += (unsigned)read1(in) << 8;
val += (unsigned long)read1(in) << 16;
val += (unsigned long)read1(in) << 24;
return val;
}
/* skip over gzip header */
local void gzheader(file *in)
{
int flags;
unsigned n;
if (read1(in) != 31 || read1(in) != 139) bye(in->name, " not a gzip file");
if (read1(in) != 8) bye("unknown compression method in", in->name);
flags = read1(in);
if (flags & 0xe0) bye("unknown header flags set in", in->name);
skip(in, 6);
if (flags & 4) {
n = read1(in);
n += (unsigned)(read1(in)) << 8;
skip(in, n);
}
if (flags & 8) while (read1(in) != 0) ;
if (flags & 16) while (read1(in) != 0) ;
if (flags & 2) skip(in, 2);
}
/* decompress gzip file "name", return strm with a deflate stream ready to
continue compression of the data in the gzip file, and return a file
descriptor pointing to where to write the compressed data -- the deflate
stream is initialized to compress using level "level" */
local int gzscan(char *name, z_stream *strm, int level)
{
int ret, lastbit, left, full;
unsigned have;
unsigned long crc, tot;
unsigned char *window;
off_t lastoff, end;
file gz;
/* open gzip file */
gz.name = name;
gz.fd = open(name, O_RDWR, 0);
if (gz.fd == -1) bye("cannot open ", name);
gz.buf = malloc(CHUNK);
if (gz.buf == NULL) bye("out of memory", "");
gz.size = LGCHUNK;
gz.left = 0;
/* skip gzip header */
gzheader(&gz);
/* prepare to decompress */
window = malloc(DSIZE);
if (window == NULL) bye("out of memory", "");
strm->zalloc = Z_NULL;
strm->zfree = Z_NULL;
strm->opaque = Z_NULL;
ret = inflateInit2(strm, -15);
if (ret != Z_OK) bye("out of memory", " or library mismatch");
/* decompress the deflate stream, saving append information */
lastbit = 0;
lastoff = lseek(gz.fd, 0L, SEEK_CUR) - gz.left;
left = 0;
strm->avail_in = gz.left;
strm->next_in = gz.next;
crc = crc32(0L, Z_NULL, 0);
have = full = 0;
do {
/* if needed, get more input */
if (strm->avail_in == 0) {
readmore(&gz);
strm->avail_in = gz.left;
strm->next_in = gz.next;
}
/* set up output to next available section of sliding window */
strm->avail_out = DSIZE - have;
strm->next_out = window + have;
/* inflate and check for errors */
ret = inflate(strm, Z_BLOCK);
if (ret == Z_STREAM_ERROR) bye("internal stream error!", "");
if (ret == Z_MEM_ERROR) bye("out of memory", "");
if (ret == Z_DATA_ERROR)
bye("invalid compressed data--format violated in", name);
/* update crc and sliding window pointer */
crc = crc32(crc, window + have, DSIZE - have - strm->avail_out);
if (strm->avail_out)
have = DSIZE - strm->avail_out;
else {
have = 0;
full = 1;
}
/* process end of block */
if (strm->data_type & 128) {
if (strm->data_type & 64)
left = strm->data_type & 0x1f;
else {
lastbit = strm->data_type & 0x1f;
lastoff = lseek(gz.fd, 0L, SEEK_CUR) - strm->avail_in;
}
}
} while (ret != Z_STREAM_END);
inflateEnd(strm);
gz.left = strm->avail_in;
gz.next = strm->next_in;
/* save the location of the end of the compressed data */
end = lseek(gz.fd, 0L, SEEK_CUR) - gz.left;
/* check gzip trailer and save total for deflate */
if (crc != read4(&gz))
bye("invalid compressed data--crc mismatch in ", name);
tot = strm->total_out;
if ((tot & 0xffffffffUL) != read4(&gz))
bye("invalid compressed data--length mismatch in", name);
/* if not at end of file, warn */
if (gz.left || readin(&gz))
fprintf(stderr,
"gzappend warning: junk at end of gzip file overwritten\n");
/* clear last block bit */
lseek(gz.fd, lastoff - (lastbit != 0), SEEK_SET);
if (read(gz.fd, gz.buf, 1) != 1) bye("reading after seek on ", name);
*gz.buf = (unsigned char)(*gz.buf ^ (1 << ((8 - lastbit) & 7)));
lseek(gz.fd, -1L, SEEK_CUR);
if (write(gz.fd, gz.buf, 1) != 1) bye("writing after seek to ", name);
/* if window wrapped, build dictionary from window by rotating */
if (full) {
rotate(window, DSIZE, have);
have = DSIZE;
}
/* set up deflate stream with window, crc, total_in, and leftover bits */
ret = deflateInit2(strm, level, Z_DEFLATED, -15, 8, Z_DEFAULT_STRATEGY);
if (ret != Z_OK) bye("out of memory", "");
deflateSetDictionary(strm, window, have);
strm->adler = crc;
strm->total_in = tot;
if (left) {
lseek(gz.fd, --end, SEEK_SET);
if (read(gz.fd, gz.buf, 1) != 1) bye("reading after seek on ", name);
deflatePrime(strm, 8 - left, *gz.buf);
}
lseek(gz.fd, end, SEEK_SET);
/* clean up and return */
free(window);
free(gz.buf);
return gz.fd;
}
/* append file "name" to gzip file gd using deflate stream strm -- if last
is true, then finish off the deflate stream at the end */
local void gztack(char *name, int gd, z_stream *strm, int last)
{
int fd, len, ret;
unsigned left;
unsigned char *in, *out;
/* open file to compress and append */
fd = 0;
if (name != NULL) {
fd = open(name, O_RDONLY, 0);
if (fd == -1)
fprintf(stderr, "gzappend warning: %s not found, skipping ...\n",
name);
}
/* allocate buffers */
in = malloc(CHUNK);
out = malloc(CHUNK);
if (in == NULL || out == NULL) bye("out of memory", "");
/* compress input file and append to gzip file */
do {
/* get more input */
len = read(fd, in, CHUNK);
if (len == -1) {
fprintf(stderr,
"gzappend warning: error reading %s, skipping rest ...\n",
name);
len = 0;
}
strm->avail_in = (unsigned)len;
strm->next_in = in;
if (len) strm->adler = crc32(strm->adler, in, (unsigned)len);
/* compress and write all available output */
do {
strm->avail_out = CHUNK;
strm->next_out = out;
ret = deflate(strm, last && len == 0 ? Z_FINISH : Z_NO_FLUSH);
left = CHUNK - strm->avail_out;
while (left) {
len = write(gd, out + CHUNK - strm->avail_out - left, left);
if (len == -1) bye("writing gzip file", "");
left -= (unsigned)len;
}
} while (strm->avail_out == 0 && ret != Z_STREAM_END);
} while (len != 0);
/* write trailer after last entry */
if (last) {
deflateEnd(strm);
out[0] = (unsigned char)(strm->adler);
out[1] = (unsigned char)(strm->adler >> 8);
out[2] = (unsigned char)(strm->adler >> 16);
out[3] = (unsigned char)(strm->adler >> 24);
out[4] = (unsigned char)(strm->total_in);
out[5] = (unsigned char)(strm->total_in >> 8);
out[6] = (unsigned char)(strm->total_in >> 16);
out[7] = (unsigned char)(strm->total_in >> 24);
len = 8;
do {
ret = write(gd, out + 8 - len, len);
if (ret == -1) bye("writing gzip file", "");
len -= ret;
} while (len);
close(gd);
}
/* clean up and return */
free(out);
free(in);
if (fd > 0) close(fd);
}
/* process the compression level option if present, scan the gzip file, and
append the specified files, or append the data from stdin if no other file
names are provided on the command line -- the gzip file must be writable
and seekable */
int main(int argc, char **argv)
{
int gd, level;
z_stream strm;
/* ignore command name */
argc--; argv++;
/* provide usage if no arguments */
if (*argv == NULL) {
printf(
"gzappend 1.2 (11 Oct 2012) Copyright (C) 2003, 2012 Mark Adler\n"
);
printf(
"usage: gzappend [-level] file.gz [ addthis [ andthis ... ]]\n");
return 0;
}
/* set compression level */
level = Z_DEFAULT_COMPRESSION;
if (argv[0][0] == '-') {
if (argv[0][1] < '0' || argv[0][1] > '9' || argv[0][2] != 0)
bye("invalid compression level", "");
level = argv[0][1] - '0';
if (*++argv == NULL) bye("no gzip file name after options", "");
}
/* prepare to append to gzip file */
gd = gzscan(*argv++, &strm, level);
/* append files on command line, or from stdin if none */
if (*argv == NULL)
gztack(NULL, gd, &strm, 1);
else
do {
gztack(*argv, gd, &strm, argv[1] == NULL);
} while (*++argv != NULL);
return 0;
}

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/* gzjoin -- command to join gzip files into one gzip file
Copyright (C) 2004, 2005, 2012 Mark Adler, all rights reserved
version 1.2, 14 Aug 2012
This software is provided 'as-is', without any express or implied
warranty. In no event will the author be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
Mark Adler madler@alumni.caltech.edu
*/
/*
* Change history:
*
* 1.0 11 Dec 2004 - First version
* 1.1 12 Jun 2005 - Changed ssize_t to long for portability
* 1.2 14 Aug 2012 - Clean up for z_const usage
*/
/*
gzjoin takes one or more gzip files on the command line and writes out a
single gzip file that will uncompress to the concatenation of the
uncompressed data from the individual gzip files. gzjoin does this without
having to recompress any of the data and without having to calculate a new
crc32 for the concatenated uncompressed data. gzjoin does however have to
decompress all of the input data in order to find the bits in the compressed
data that need to be modified to concatenate the streams.
gzjoin does not do an integrity check on the input gzip files other than
checking the gzip header and decompressing the compressed data. They are
otherwise assumed to be complete and correct.
Each joint between gzip files removes at least 18 bytes of previous trailer
and subsequent header, and inserts an average of about three bytes to the
compressed data in order to connect the streams. The output gzip file
has a minimal ten-byte gzip header with no file name or modification time.
This program was written to illustrate the use of the Z_BLOCK option of
inflate() and the crc32_combine() function. gzjoin will not compile with
versions of zlib earlier than 1.2.3.
*/
#include <stdio.h> /* fputs(), fprintf(), fwrite(), putc() */
#include <stdlib.h> /* exit(), malloc(), free() */
#include <fcntl.h> /* open() */
#include <unistd.h> /* close(), read(), lseek() */
#include "zlib.h"
/* crc32(), crc32_combine(), inflateInit2(), inflate(), inflateEnd() */
#define local static
/* exit with an error (return a value to allow use in an expression) */
local int bail(char *why1, char *why2)
{
fprintf(stderr, "gzjoin error: %s%s, output incomplete\n", why1, why2);
exit(1);
return 0;
}
/* -- simple buffered file input with access to the buffer -- */
#define CHUNK 32768 /* must be a power of two and fit in unsigned */
/* bin buffered input file type */
typedef struct {
char *name; /* name of file for error messages */
int fd; /* file descriptor */
unsigned left; /* bytes remaining at next */
unsigned char *next; /* next byte to read */
unsigned char *buf; /* allocated buffer of length CHUNK */
} bin;
/* close a buffered file and free allocated memory */
local void bclose(bin *in)
{
if (in != NULL) {
if (in->fd != -1)
close(in->fd);
if (in->buf != NULL)
free(in->buf);
free(in);
}
}
/* open a buffered file for input, return a pointer to type bin, or NULL on
failure */
local bin *bopen(char *name)
{
bin *in;
in = malloc(sizeof(bin));
if (in == NULL)
return NULL;
in->buf = malloc(CHUNK);
in->fd = open(name, O_RDONLY, 0);
if (in->buf == NULL || in->fd == -1) {
bclose(in);
return NULL;
}
in->left = 0;
in->next = in->buf;
in->name = name;
return in;
}
/* load buffer from file, return -1 on read error, 0 or 1 on success, with
1 indicating that end-of-file was reached */
local int bload(bin *in)
{
long len;
if (in == NULL)
return -1;
if (in->left != 0)
return 0;
in->next = in->buf;
do {
len = (long)read(in->fd, in->buf + in->left, CHUNK - in->left);
if (len < 0)
return -1;
in->left += (unsigned)len;
} while (len != 0 && in->left < CHUNK);
return len == 0 ? 1 : 0;
}
/* get a byte from the file, bail if end of file */
#define bget(in) (in->left ? 0 : bload(in), \
in->left ? (in->left--, *(in->next)++) : \
bail("unexpected end of file on ", in->name))
/* get a four-byte little-endian unsigned integer from file */
local unsigned long bget4(bin *in)
{
unsigned long val;
val = bget(in);
val += (unsigned long)(bget(in)) << 8;
val += (unsigned long)(bget(in)) << 16;
val += (unsigned long)(bget(in)) << 24;
return val;
}
/* skip bytes in file */
local void bskip(bin *in, unsigned skip)
{
/* check pointer */
if (in == NULL)
return;
/* easy case -- skip bytes in buffer */
if (skip <= in->left) {
in->left -= skip;
in->next += skip;
return;
}
/* skip what's in buffer, discard buffer contents */
skip -= in->left;
in->left = 0;
/* seek past multiples of CHUNK bytes */
if (skip > CHUNK) {
unsigned left;
left = skip & (CHUNK - 1);
if (left == 0) {
/* exact number of chunks: seek all the way minus one byte to check
for end-of-file with a read */
lseek(in->fd, skip - 1, SEEK_CUR);
if (read(in->fd, in->buf, 1) != 1)
bail("unexpected end of file on ", in->name);
return;
}
/* skip the integral chunks, update skip with remainder */
lseek(in->fd, skip - left, SEEK_CUR);
skip = left;
}
/* read more input and skip remainder */
bload(in);
if (skip > in->left)
bail("unexpected end of file on ", in->name);
in->left -= skip;
in->next += skip;
}
/* -- end of buffered input functions -- */
/* skip the gzip header from file in */
local void gzhead(bin *in)
{
int flags;
/* verify gzip magic header and compression method */
if (bget(in) != 0x1f || bget(in) != 0x8b || bget(in) != 8)
bail(in->name, " is not a valid gzip file");
/* get and verify flags */
flags = bget(in);
if ((flags & 0xe0) != 0)
bail("unknown reserved bits set in ", in->name);
/* skip modification time, extra flags, and os */
bskip(in, 6);
/* skip extra field if present */
if (flags & 4) {
unsigned len;
len = bget(in);
len += (unsigned)(bget(in)) << 8;
bskip(in, len);
}
/* skip file name if present */
if (flags & 8)
while (bget(in) != 0)
;
/* skip comment if present */
if (flags & 16)
while (bget(in) != 0)
;
/* skip header crc if present */
if (flags & 2)
bskip(in, 2);
}
/* write a four-byte little-endian unsigned integer to out */
local void put4(unsigned long val, FILE *out)
{
putc(val & 0xff, out);
putc((val >> 8) & 0xff, out);
putc((val >> 16) & 0xff, out);
putc((val >> 24) & 0xff, out);
}
/* Load up zlib stream from buffered input, bail if end of file */
local void zpull(z_streamp strm, bin *in)
{
if (in->left == 0)
bload(in);
if (in->left == 0)
bail("unexpected end of file on ", in->name);
strm->avail_in = in->left;
strm->next_in = in->next;
}
/* Write header for gzip file to out and initialize trailer. */
local void gzinit(unsigned long *crc, unsigned long *tot, FILE *out)
{
fwrite("\x1f\x8b\x08\0\0\0\0\0\0\xff", 1, 10, out);
*crc = crc32(0L, Z_NULL, 0);
*tot = 0;
}
/* Copy the compressed data from name, zeroing the last block bit of the last
block if clr is true, and adding empty blocks as needed to get to a byte
boundary. If clr is false, then the last block becomes the last block of
the output, and the gzip trailer is written. crc and tot maintains the
crc and length (modulo 2^32) of the output for the trailer. The resulting
gzip file is written to out. gzinit() must be called before the first call
of gzcopy() to write the gzip header and to initialize crc and tot. */
local void gzcopy(char *name, int clr, unsigned long *crc, unsigned long *tot,
FILE *out)
{
int ret; /* return value from zlib functions */
int pos; /* where the "last block" bit is in byte */
int last; /* true if processing the last block */
bin *in; /* buffered input file */
unsigned char *start; /* start of compressed data in buffer */
unsigned char *junk; /* buffer for uncompressed data -- discarded */
z_off_t len; /* length of uncompressed data (support > 4 GB) */
z_stream strm; /* zlib inflate stream */
/* open gzip file and skip header */
in = bopen(name);
if (in == NULL)
bail("could not open ", name);
gzhead(in);
/* allocate buffer for uncompressed data and initialize raw inflate
stream */
junk = malloc(CHUNK);
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.avail_in = 0;
strm.next_in = Z_NULL;
ret = inflateInit2(&strm, -15);
if (junk == NULL || ret != Z_OK)
bail("out of memory", "");
/* inflate and copy compressed data, clear last-block bit if requested */
len = 0;
zpull(&strm, in);
start = in->next;
last = start[0] & 1;
if (last && clr)
start[0] &= ~1;
strm.avail_out = 0;
for (;;) {
/* if input used and output done, write used input and get more */
if (strm.avail_in == 0 && strm.avail_out != 0) {
fwrite(start, 1, strm.next_in - start, out);
start = in->buf;
in->left = 0;
zpull(&strm, in);
}
/* decompress -- return early when end-of-block reached */
strm.avail_out = CHUNK;
strm.next_out = junk;
ret = inflate(&strm, Z_BLOCK);
switch (ret) {
case Z_MEM_ERROR:
bail("out of memory", "");
case Z_DATA_ERROR:
bail("invalid compressed data in ", in->name);
}
/* update length of uncompressed data */
len += CHUNK - strm.avail_out;
/* check for block boundary (only get this when block copied out) */
if (strm.data_type & 128) {
/* if that was the last block, then done */
if (last)
break;
/* number of unused bits in last byte */
pos = strm.data_type & 7;
/* find the next last-block bit */
if (pos != 0) {
/* next last-block bit is in last used byte */
pos = 0x100 >> pos;
last = strm.next_in[-1] & pos;
if (last && clr)
in->buf[strm.next_in - in->buf - 1] &= ~pos;
}
else {
/* next last-block bit is in next unused byte */
if (strm.avail_in == 0) {
/* don't have that byte yet -- get it */
fwrite(start, 1, strm.next_in - start, out);
start = in->buf;
in->left = 0;
zpull(&strm, in);
}
last = strm.next_in[0] & 1;
if (last && clr)
in->buf[strm.next_in - in->buf] &= ~1;
}
}
}
/* update buffer with unused input */
in->left = strm.avail_in;
in->next = in->buf + (strm.next_in - in->buf);
/* copy used input, write empty blocks to get to byte boundary */
pos = strm.data_type & 7;
fwrite(start, 1, in->next - start - 1, out);
last = in->next[-1];
if (pos == 0 || !clr)
/* already at byte boundary, or last file: write last byte */
putc(last, out);
else {
/* append empty blocks to last byte */
last &= ((0x100 >> pos) - 1); /* assure unused bits are zero */
if (pos & 1) {
/* odd -- append an empty stored block */
putc(last, out);
if (pos == 1)
putc(0, out); /* two more bits in block header */
fwrite("\0\0\xff\xff", 1, 4, out);
}
else {
/* even -- append 1, 2, or 3 empty fixed blocks */
switch (pos) {
case 6:
putc(last | 8, out);
last = 0;
case 4:
putc(last | 0x20, out);
last = 0;
case 2:
putc(last | 0x80, out);
putc(0, out);
}
}
}
/* update crc and tot */
*crc = crc32_combine(*crc, bget4(in), len);
*tot += (unsigned long)len;
/* clean up */
inflateEnd(&strm);
free(junk);
bclose(in);
/* write trailer if this is the last gzip file */
if (!clr) {
put4(*crc, out);
put4(*tot, out);
}
}
/* join the gzip files on the command line, write result to stdout */
int main(int argc, char **argv)
{
unsigned long crc, tot; /* running crc and total uncompressed length */
/* skip command name */
argc--;
argv++;
/* show usage if no arguments */
if (argc == 0) {
fputs("gzjoin usage: gzjoin f1.gz [f2.gz [f3.gz ...]] > fjoin.gz\n",
stderr);
return 0;
}
/* join gzip files on command line and write to stdout */
gzinit(&crc, &tot, stdout);
while (argc--)
gzcopy(*argv++, argc, &crc, &tot, stdout);
/* done */
return 0;
}

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/* gzlog.h
Copyright (C) 2004, 2008, 2012 Mark Adler, all rights reserved
version 2.2, 14 Aug 2012
This software is provided 'as-is', without any express or implied
warranty. In no event will the author be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
Mark Adler madler@alumni.caltech.edu
*/
/* Version History:
1.0 26 Nov 2004 First version
2.0 25 Apr 2008 Complete redesign for recovery of interrupted operations
Interface changed slightly in that now path is a prefix
Compression now occurs as needed during gzlog_write()
gzlog_write() now always leaves the log file as valid gzip
2.1 8 Jul 2012 Fix argument checks in gzlog_compress() and gzlog_write()
2.2 14 Aug 2012 Clean up signed comparisons
*/
/*
The gzlog object allows writing short messages to a gzipped log file,
opening the log file locked for small bursts, and then closing it. The log
object works by appending stored (uncompressed) data to the gzip file until
1 MB has been accumulated. At that time, the stored data is compressed, and
replaces the uncompressed data in the file. The log file is truncated to
its new size at that time. After each write operation, the log file is a
valid gzip file that can decompressed to recover what was written.
The gzlog operations can be interrupted at any point due to an application or
system crash, and the log file will be recovered the next time the log is
opened with gzlog_open().
*/
#ifndef GZLOG_H
#define GZLOG_H
/* gzlog object type */
typedef void gzlog;
/* Open a gzlog object, creating the log file if it does not exist. Return
NULL on error. Note that gzlog_open() could take a while to complete if it
has to wait to verify that a lock is stale (possibly for five minutes), or
if there is significant contention with other instantiations of this object
when locking the resource. path is the prefix of the file names created by
this object. If path is "foo", then the log file will be "foo.gz", and
other auxiliary files will be created and destroyed during the process:
"foo.dict" for a compression dictionary, "foo.temp" for a temporary (next)
dictionary, "foo.add" for data being added or compressed, "foo.lock" for the
lock file, and "foo.repairs" to log recovery operations performed due to
interrupted gzlog operations. A gzlog_open() followed by a gzlog_close()
will recover a previously interrupted operation, if any. */
gzlog *gzlog_open(char *path);
/* Write to a gzlog object. Return zero on success, -1 if there is a file i/o
error on any of the gzlog files (this should not happen if gzlog_open()
succeeded, unless the device has run out of space or leftover auxiliary
files have permissions or ownership that prevent their use), -2 if there is
a memory allocation failure, or -3 if the log argument is invalid (e.g. if
it was not created by gzlog_open()). This function will write data to the
file uncompressed, until 1 MB has been accumulated, at which time that data
will be compressed. The log file will be a valid gzip file upon successful
return. */
int gzlog_write(gzlog *log, void *data, size_t len);
/* Force compression of any uncompressed data in the log. This should be used
sparingly, if at all. The main application would be when a log file will
not be appended to again. If this is used to compress frequently while
appending, it will both significantly increase the execution time and
reduce the compression ratio. The return codes are the same as for
gzlog_write(). */
int gzlog_compress(gzlog *log);
/* Close a gzlog object. Return zero on success, -3 if the log argument is
invalid. The log object is freed, and so cannot be referenced again. */
int gzlog_close(gzlog *log);
#endif

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/* gznorm.c -- normalize a gzip stream
* Copyright (C) 2018 Mark Adler
* For conditions of distribution and use, see copyright notice in zlib.h
* Version 1.0 7 Oct 2018 Mark Adler */
// gznorm takes a gzip stream, potentially containing multiple members, and
// converts it to a gzip stream with a single member. In addition the gzip
// header is normalized, removing the file name and time stamp, and setting the
// other header contents (XFL, OS) to fixed values. gznorm does not recompress
// the data, so it is fast, but no advantage is gained from the history that
// could be available across member boundaries.
#include <stdio.h> // fread, fwrite, putc, fflush, ferror, fprintf,
// vsnprintf, stdout, stderr, NULL, FILE
#include <stdlib.h> // malloc, free
#include <string.h> // strerror
#include <errno.h> // errno
#include <stdarg.h> // va_list, va_start, va_end
#include "zlib.h" // inflateInit2, inflate, inflateReset, inflateEnd,
// z_stream, z_off_t, crc32_combine, Z_NULL, Z_BLOCK,
// Z_OK, Z_STREAM_END, Z_BUF_ERROR, Z_DATA_ERROR,
// Z_MEM_ERROR
#if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__)
# include <fcntl.h>
# include <io.h>
# define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
#else
# define SET_BINARY_MODE(file)
#endif
#define local static
// printf to an allocated string. Return the string, or NULL if the printf or
// allocation fails.
local char *aprintf(char *fmt, ...) {
// Get the length of the result of the printf.
va_list args;
va_start(args, fmt);
int len = vsnprintf(NULL, 0, fmt, args);
va_end(args);
if (len < 0)
return NULL;
// Allocate the required space and printf to it.
char *str = malloc(len + 1);
if (str == NULL)
return NULL;
va_start(args, fmt);
vsnprintf(str, len + 1, fmt, args);
va_end(args);
return str;
}
// Return with an error, putting an allocated error message in *err. Doing an
// inflateEnd() on an already ended state, or one with state set to Z_NULL, is
// permitted.
#define BYE(...) \
do { \
inflateEnd(&strm); \
*err = aprintf(__VA_ARGS__); \
return 1; \
} while (0)
// Chunk size for buffered reads and for decompression. Twice this many bytes
// will be allocated on the stack by gzip_normalize(). Must fit in an unsigned.
#define CHUNK 16384
// Read a gzip stream from in and write an equivalent normalized gzip stream to
// out. If given no input, an empty gzip stream will be written. If successful,
// 0 is returned, and *err is set to NULL. On error, 1 is returned, where the
// details of the error are returned in *err, a pointer to an allocated string.
//
// The input may be a stream with multiple gzip members, which is converted to
// a single gzip member on the output. Each gzip member is decompressed at the
// level of deflate blocks. This enables clearing the last-block bit, shifting
// the compressed data to concatenate to the previous member's compressed data,
// which can end at an arbitrary bit boundary, and identifying stored blocks in
// order to resynchronize those to byte boundaries. The deflate compressed data
// is terminated with a 10-bit empty fixed block. If any members on the input
// end with a 10-bit empty fixed block, then that block is excised from the
// stream. This avoids appending empty fixed blocks for every normalization,
// and assures that gzip_normalize applied a second time will not change the
// input. The pad bits after stored block headers and after the final deflate
// block are all forced to zeros.
local int gzip_normalize(FILE *in, FILE *out, char **err) {
// initialize the inflate engine to process a gzip member
z_stream strm;
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.avail_in = 0;
strm.next_in = Z_NULL;
if (inflateInit2(&strm, 15 + 16) != Z_OK)
BYE("out of memory");
// State while processing the input gzip stream.
enum { // BETWEEN -> HEAD -> BLOCK -> TAIL -> BETWEEN -> ...
BETWEEN, // between gzip members (must end in this state)
HEAD, // reading a gzip header
BLOCK, // reading deflate blocks
TAIL // reading a gzip trailer
} state = BETWEEN; // current component being processed
unsigned long crc = 0; // accumulated CRC of uncompressed data
unsigned long len = 0; // accumulated length of uncompressed data
unsigned long buf = 0; // deflate stream bit buffer of num bits
int num = 0; // number of bits in buf (at bottom)
// Write a canonical gzip header (no mod time, file name, comment, extra
// block, or extra flags, and OS is marked as unknown).
fwrite("\x1f\x8b\x08\0\0\0\0\0\0\xff", 1, 10, out);
// Process the gzip stream from in until reaching the end of the input,
// encountering invalid input, or experiencing an i/o error.
int more; // true if not at the end of the input
do {
// State inside this loop.
unsigned char *put; // next input buffer location to process
int prev; // number of bits from previous block in
// the bit buffer, or -1 if not at the
// start of a block
unsigned long long memb; // uncompressed length of member
size_t tail; // number of trailer bytes read (0..8)
unsigned long part; // accumulated trailer component
// Get the next chunk of input from in.
unsigned char dat[CHUNK];
strm.avail_in = fread(dat, 1, CHUNK, in);
if (strm.avail_in == 0)
break;
more = strm.avail_in == CHUNK;
strm.next_in = put = dat;
// Run that chunk of input through the inflate engine to exhaustion.
do {
// At this point it is assured that strm.avail_in > 0.
// Inflate until the end of a gzip component (header, deflate
// block, trailer) is reached, or until all of the chunk is
// consumed. The resulting decompressed data is discarded, though
// the total size of the decompressed data in each member is
// tracked, for the calculation of the total CRC.
do {
// inflate and handle any errors
unsigned char scrap[CHUNK];
strm.avail_out = CHUNK;
strm.next_out = scrap;
int ret = inflate(&strm, Z_BLOCK);
if (ret == Z_MEM_ERROR)
BYE("out of memory");
if (ret == Z_DATA_ERROR)
BYE("input invalid: %s", strm.msg);
if (ret != Z_OK && ret != Z_BUF_ERROR && ret != Z_STREAM_END)
BYE("internal error");
// Update the number of uncompressed bytes generated in this
// member. The actual count (not modulo 2^32) is required to
// correctly compute the total CRC.
unsigned got = CHUNK - strm.avail_out;
memb += got;
if (memb < got)
BYE("overflow error");
// Continue to process this chunk until it is consumed, or
// until the end of a component (header, deflate block, or
// trailer) is reached.
} while (strm.avail_out == 0 && (strm.data_type & 0x80) == 0);
// Since strm.avail_in was > 0 for the inflate call, some input was
// just consumed. It is therefore assured that put < strm.next_in.
// Disposition the consumed component or part of a component.
switch (state) {
case BETWEEN:
state = HEAD;
// Fall through to HEAD when some or all of the header is
// processed.
case HEAD:
// Discard the header.
if (strm.data_type & 0x80) {
// End of header reached -- deflate blocks follow.
put = strm.next_in;
prev = num;
memb = 0;
state = BLOCK;
}
break;
case BLOCK:
// Copy the deflate stream to the output, but with the
// last-block-bit cleared. Re-synchronize stored block
// headers to the output byte boundaries. The bytes at
// put..strm.next_in-1 is the compressed data that has been
// processed and is ready to be copied to the output.
// At this point, it is assured that new compressed data is
// available, i.e., put < strm.next_in. If prev is -1, then
// that compressed data starts in the middle of a deflate
// block. If prev is not -1, then the bits in the bit
// buffer, possibly combined with the bits in *put, contain
// the three-bit header of the new deflate block. In that
// case, prev is the number of bits from the previous block
// that remain in the bit buffer. Since num is the number
// of bits in the bit buffer, we have that num - prev is
// the number of bits from the new block currently in the
// bit buffer.
// If strm.data_type & 0xc0 is 0x80, then the last byte of
// the available compressed data includes the last bits of
// the end of a deflate block. In that case, that last byte
// also has strm.data_type & 0x1f bits of the next deflate
// block, in the range 0..7. If strm.data_type & 0xc0 is
// 0xc0, then the last byte of the compressed data is the
// end of the deflate stream, followed by strm.data_type &
// 0x1f pad bits, also in the range 0..7.
// Set bits to the number of bits not yet consumed from the
// last byte. If we are at the end of the block, bits is
// either the number of bits in the last byte belonging to
// the next block, or the number of pad bits after the
// final block. In either of those cases, bits is in the
// range 0..7.
; // (required due to C syntax oddity)
int bits = strm.data_type & 0x1f;
if (prev != -1) {
// We are at the start of a new block. Clear the last
// block bit, and check for special cases. If it is a
// stored block, then emit the header and pad to the
// next byte boundary. If it is a final, empty fixed
// block, then excise it.
// Some or all of the three header bits for this block
// may already be in the bit buffer. Load any remaining
// header bits into the bit buffer.
if (num - prev < 3) {
buf += (unsigned long)*put++ << num;
num += 8;
}
// Set last to have a 1 in the position of the last
// block bit in the bit buffer.
unsigned long last = (unsigned long)1 << prev;
if (((buf >> prev) & 7) == 3) {
// This is a final fixed block. Load at least ten
// bits from this block, including the header, into
// the bit buffer. We already have at least three,
// so at most one more byte needs to be loaded.
if (num - prev < 10) {
if (put == strm.next_in)
// Need to go get and process more input.
// We'll end up back here to finish this.
break;
buf += (unsigned long)*put++ << num;
num += 8;
}
if (((buf >> prev) & 0x3ff) == 3) {
// That final fixed block is empty. Delete it
// to avoid adding an empty block every time a
// gzip stream is normalized.
num = prev;
buf &= last - 1; // zero the pad bits
}
}
else if (((buf >> prev) & 6) == 0) {
// This is a stored block. Flush to the next
// byte boundary after the three-bit header.
num = (prev + 10) & ~7;
buf &= last - 1; // zero the pad bits
}
// Clear the last block bit.
buf &= ~last;
// Write out complete bytes in the bit buffer.
while (num >= 8) {
putc(buf, out);
buf >>= 8;
num -= 8;
}
// If no more bytes left to process, then we have
// consumed the byte that had bits from the next block.
if (put == strm.next_in)
bits = 0;
}
// We are done handling the deflate block header. Now copy
// all or almost all of the remaining compressed data that
// has been processed so far. Don't copy one byte at the
// end if it contains bits from the next deflate block or
// pad bits at the end of a deflate block.
// mix is 1 if we are at the end of a deflate block, and if
// some of the bits in the last byte follow this block. mix
// is 0 if we are in the middle of a deflate block, if the
// deflate block ended on a byte boundary, or if all of the
// compressed data processed so far has been consumed.
int mix = (strm.data_type & 0x80) && bits;
// Copy all of the processed compressed data to the output,
// except for the last byte if it contains bits from the
// next deflate block or pad bits at the end of the deflate
// stream. Copy the data after shifting in num bits from
// buf in front of it, leaving num bits from the end of the
// compressed data in buf when done.
unsigned char *end = strm.next_in - mix;
if (put < end) {
if (num)
// Insert num bits from buf before the data being
// copied.
do {
buf += (unsigned)(*put++) << num;
putc(buf, out);
buf >>= 8;
} while (put < end);
else {
// No shifting needed -- write directly.
fwrite(put, 1, end - put, out);
put = end;
}
}
// Process the last processed byte if it wasn't written.
if (mix) {
// Load the last byte into the bit buffer.
buf += (unsigned)(*put++) << num;
num += 8;
if (strm.data_type & 0x40) {
// We are at the end of the deflate stream and
// there are bits pad bits. Discard the pad bits
// and write a byte to the output, if available.
// Leave the num bits left over in buf to prepend
// to the next deflate stream.
num -= bits;
if (num >= 8) {
putc(buf, out);
num -= 8;
buf >>= 8;
}
// Force the pad bits in the bit buffer to zeros.
buf &= ((unsigned long)1 << num) - 1;
// Don't need to set prev here since going to TAIL.
}
else
// At the end of an internal deflate block. Leave
// the last byte in the bit buffer to examine on
// the next entry to BLOCK, when more bits from the
// next block will be available.
prev = num - bits; // number of bits in buffer
// from current block
}
// Don't have a byte left over, so we are in the middle of
// a deflate block, or the deflate block ended on a byte
// boundary. Set prev appropriately for the next entry into
// BLOCK.
else if (strm.data_type & 0x80)
// The block ended on a byte boundary, so no header
// bits are in the bit buffer.
prev = num;
else
// In the middle of a deflate block, so no header here.
prev = -1;
// Check for the end of the deflate stream.
if ((strm.data_type & 0xc0) == 0xc0) {
// That ends the deflate stream on the input side, the
// pad bits were discarded, and any remaining bits from
// the last block in the stream are saved in the bit
// buffer to prepend to the next stream. Process the
// gzip trailer next.
tail = 0;
part = 0;
state = TAIL;
}
break;
case TAIL:
// Accumulate available trailer bytes to update the total
// CRC and the total uncompressed length.
do {
part = (part >> 8) + ((unsigned long)(*put++) << 24);
tail++;
if (tail == 4) {
// Update the total CRC.
z_off_t len2 = memb;
if (len2 < 0 || (unsigned long long)len2 != memb)
BYE("overflow error");
crc = crc ? crc32_combine(crc, part, len2) : part;
part = 0;
}
else if (tail == 8) {
// Update the total uncompressed length. (It's ok
// if this sum is done modulo 2^32.)
len += part;
// At the end of a member. Set up to inflate an
// immediately following gzip member. (If we made
// it this far, then the trailer was valid.)
if (inflateReset(&strm) != Z_OK)
BYE("internal error");
state = BETWEEN;
break;
}
} while (put < strm.next_in);
break;
}
// Process the input buffer until completely consumed.
} while (strm.avail_in > 0);
// Process input until end of file, invalid input, or i/o error.
} while (more);
// Done with the inflate engine.
inflateEnd(&strm);
// Verify the validity of the input.
if (state != BETWEEN)
BYE("input invalid: incomplete gzip stream");
// Write the remaining deflate stream bits, followed by a terminating
// deflate fixed block.
buf += (unsigned long)3 << num;
putc(buf, out);
putc(buf >> 8, out);
if (num > 6)
putc(0, out);
// Write the gzip trailer, which is the CRC and the uncompressed length
// modulo 2^32, both in little-endian order.
putc(crc, out);
putc(crc >> 8, out);
putc(crc >> 16, out);
putc(crc >> 24, out);
putc(len, out);
putc(len >> 8, out);
putc(len >> 16, out);
putc(len >> 24, out);
fflush(out);
// Check for any i/o errors.
if (ferror(in) || ferror(out))
BYE("i/o error: %s", strerror(errno));
// All good!
*err = NULL;
return 0;
}
// Normalize the gzip stream on stdin, writing the result to stdout.
int main(void) {
// Avoid end-of-line conversions on evil operating systems.
SET_BINARY_MODE(stdin);
SET_BINARY_MODE(stdout);
// Normalize from stdin to stdout, returning 1 on error, 0 if ok.
char *err;
int ret = gzip_normalize(stdin, stdout, &err);
if (ret)
fprintf(stderr, "gznorm error: %s\n", err);
free(err);
return ret;
}

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
"http://www.w3.org/TR/REC-html40/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>zlib Usage Example</title>
<!-- Copyright (c) 2004, 2005 Mark Adler. -->
</head>
<body bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#00A000">
<h2 align="center"> zlib Usage Example </h2>
We often get questions about how the <tt>deflate()</tt> and <tt>inflate()</tt> functions should be used.
Users wonder when they should provide more input, when they should use more output,
what to do with a <tt>Z_BUF_ERROR</tt>, how to make sure the process terminates properly, and
so on. So for those who have read <tt>zlib.h</tt> (a few times), and
would like further edification, below is an annotated example in C of simple routines to compress and decompress
from an input file to an output file using <tt>deflate()</tt> and <tt>inflate()</tt> respectively. The
annotations are interspersed between lines of the code. So please read between the lines.
We hope this helps explain some of the intricacies of <em>zlib</em>.
<p>
Without further adieu, here is the program <a href="zpipe.c"><tt>zpipe.c</tt></a>:
<pre><b>
/* zpipe.c: example of proper use of zlib's inflate() and deflate()
Not copyrighted -- provided to the public domain
Version 1.4 11 December 2005 Mark Adler */
/* Version history:
1.0 30 Oct 2004 First version
1.1 8 Nov 2004 Add void casting for unused return values
Use switch statement for inflate() return values
1.2 9 Nov 2004 Add assertions to document zlib guarantees
1.3 6 Apr 2005 Remove incorrect assertion in inf()
1.4 11 Dec 2005 Add hack to avoid MSDOS end-of-line conversions
Avoid some compiler warnings for input and output buffers
*/
</b></pre><!-- -->
We now include the header files for the required definitions. From
<tt>stdio.h</tt> we use <tt>fopen()</tt>, <tt>fread()</tt>, <tt>fwrite()</tt>,
<tt>feof()</tt>, <tt>ferror()</tt>, and <tt>fclose()</tt> for file i/o, and
<tt>fputs()</tt> for error messages. From <tt>string.h</tt> we use
<tt>strcmp()</tt> for command line argument processing.
From <tt>assert.h</tt> we use the <tt>assert()</tt> macro.
From <tt>zlib.h</tt>
we use the basic compression functions <tt>deflateInit()</tt>,
<tt>deflate()</tt>, and <tt>deflateEnd()</tt>, and the basic decompression
functions <tt>inflateInit()</tt>, <tt>inflate()</tt>, and
<tt>inflateEnd()</tt>.
<pre><b>
#include &lt;stdio.h&gt;
#include &lt;string.h&gt;
#include &lt;assert.h&gt;
#include "zlib.h"
</b></pre><!-- -->
This is an ugly hack required to avoid corruption of the input and output data on
Windows/MS-DOS systems. Without this, those systems would assume that the input and output
files are text, and try to convert the end-of-line characters from one standard to
another. That would corrupt binary data, and in particular would render the compressed data unusable.
This sets the input and output to binary which suppresses the end-of-line conversions.
<tt>SET_BINARY_MODE()</tt> will be used later on <tt>stdin</tt> and <tt>stdout</tt>, at the beginning of <tt>main()</tt>.
<pre><b>
#if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__)
# include &lt;fcntl.h&gt;
# include &lt;io.h&gt;
# define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
#else
# define SET_BINARY_MODE(file)
#endif
</b></pre><!-- -->
<tt>CHUNK</tt> is simply the buffer size for feeding data to and pulling data
from the <em>zlib</em> routines. Larger buffer sizes would be more efficient,
especially for <tt>inflate()</tt>. If the memory is available, buffers sizes
on the order of 128K or 256K bytes should be used.
<pre><b>
#define CHUNK 16384
</b></pre><!-- -->
The <tt>def()</tt> routine compresses data from an input file to an output file. The output data
will be in the <em>zlib</em> format, which is different from the <em>gzip</em> or <em>zip</em>
formats. The <em>zlib</em> format has a very small header of only two bytes to identify it as
a <em>zlib</em> stream and to provide decoding information, and a four-byte trailer with a fast
check value to verify the integrity of the uncompressed data after decoding.
<pre><b>
/* Compress from file source to file dest until EOF on source.
def() returns Z_OK on success, Z_MEM_ERROR if memory could not be
allocated for processing, Z_STREAM_ERROR if an invalid compression
level is supplied, Z_VERSION_ERROR if the version of zlib.h and the
version of the library linked do not match, or Z_ERRNO if there is
an error reading or writing the files. */
int def(FILE *source, FILE *dest, int level)
{
</b></pre>
Here are the local variables for <tt>def()</tt>. <tt>ret</tt> will be used for <em>zlib</em>
return codes. <tt>flush</tt> will keep track of the current flushing state for <tt>deflate()</tt>,
which is either no flushing, or flush to completion after the end of the input file is reached.
<tt>have</tt> is the amount of data returned from <tt>deflate()</tt>. The <tt>strm</tt> structure
is used to pass information to and from the <em>zlib</em> routines, and to maintain the
<tt>deflate()</tt> state. <tt>in</tt> and <tt>out</tt> are the input and output buffers for
<tt>deflate()</tt>.
<pre><b>
int ret, flush;
unsigned have;
z_stream strm;
unsigned char in[CHUNK];
unsigned char out[CHUNK];
</b></pre><!-- -->
The first thing we do is to initialize the <em>zlib</em> state for compression using
<tt>deflateInit()</tt>. This must be done before the first use of <tt>deflate()</tt>.
The <tt>zalloc</tt>, <tt>zfree</tt>, and <tt>opaque</tt> fields in the <tt>strm</tt>
structure must be initialized before calling <tt>deflateInit()</tt>. Here they are
set to the <em>zlib</em> constant <tt>Z_NULL</tt> to request that <em>zlib</em> use
the default memory allocation routines. An application may also choose to provide
custom memory allocation routines here. <tt>deflateInit()</tt> will allocate on the
order of 256K bytes for the internal state.
(See <a href="zlib_tech.html"><em>zlib Technical Details</em></a>.)
<p>
<tt>deflateInit()</tt> is called with a pointer to the structure to be initialized and
the compression level, which is an integer in the range of -1 to 9. Lower compression
levels result in faster execution, but less compression. Higher levels result in
greater compression, but slower execution. The <em>zlib</em> constant Z_DEFAULT_COMPRESSION,
equal to -1,
provides a good compromise between compression and speed and is equivalent to level 6.
Level 0 actually does no compression at all, and in fact expands the data slightly to produce
the <em>zlib</em> format (it is not a byte-for-byte copy of the input).
More advanced applications of <em>zlib</em>
may use <tt>deflateInit2()</tt> here instead. Such an application may want to reduce how
much memory will be used, at some price in compression. Or it may need to request a
<em>gzip</em> header and trailer instead of a <em>zlib</em> header and trailer, or raw
encoding with no header or trailer at all.
<p>
We must check the return value of <tt>deflateInit()</tt> against the <em>zlib</em> constant
<tt>Z_OK</tt> to make sure that it was able to
allocate memory for the internal state, and that the provided arguments were valid.
<tt>deflateInit()</tt> will also check that the version of <em>zlib</em> that the <tt>zlib.h</tt>
file came from matches the version of <em>zlib</em> actually linked with the program. This
is especially important for environments in which <em>zlib</em> is a shared library.
<p>
Note that an application can initialize multiple, independent <em>zlib</em> streams, which can
operate in parallel. The state information maintained in the structure allows the <em>zlib</em>
routines to be reentrant.
<pre><b>
/* allocate deflate state */
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
ret = deflateInit(&amp;strm, level);
if (ret != Z_OK)
return ret;
</b></pre><!-- -->
With the pleasantries out of the way, now we can get down to business. The outer <tt>do</tt>-loop
reads all of the input file and exits at the bottom of the loop once end-of-file is reached.
This loop contains the only call of <tt>deflate()</tt>. So we must make sure that all of the
input data has been processed and that all of the output data has been generated and consumed
before we fall out of the loop at the bottom.
<pre><b>
/* compress until end of file */
do {
</b></pre>
We start off by reading data from the input file. The number of bytes read is put directly
into <tt>avail_in</tt>, and a pointer to those bytes is put into <tt>next_in</tt>. We also
check to see if end-of-file on the input has been reached. If we are at the end of file, then <tt>flush</tt> is set to the
<em>zlib</em> constant <tt>Z_FINISH</tt>, which is later passed to <tt>deflate()</tt> to
indicate that this is the last chunk of input data to compress. We need to use <tt>feof()</tt>
to check for end-of-file as opposed to seeing if fewer than <tt>CHUNK</tt> bytes have been read. The
reason is that if the input file length is an exact multiple of <tt>CHUNK</tt>, we will miss
the fact that we got to the end-of-file, and not know to tell <tt>deflate()</tt> to finish
up the compressed stream. If we are not yet at the end of the input, then the <em>zlib</em>
constant <tt>Z_NO_FLUSH</tt> will be passed to <tt>deflate</tt> to indicate that we are still
in the middle of the uncompressed data.
<p>
If there is an error in reading from the input file, the process is aborted with
<tt>deflateEnd()</tt> being called to free the allocated <em>zlib</em> state before returning
the error. We wouldn't want a memory leak, now would we? <tt>deflateEnd()</tt> can be called
at any time after the state has been initialized. Once that's done, <tt>deflateInit()</tt> (or
<tt>deflateInit2()</tt>) would have to be called to start a new compression process. There is
no point here in checking the <tt>deflateEnd()</tt> return code. The deallocation can't fail.
<pre><b>
strm.avail_in = fread(in, 1, CHUNK, source);
if (ferror(source)) {
(void)deflateEnd(&amp;strm);
return Z_ERRNO;
}
flush = feof(source) ? Z_FINISH : Z_NO_FLUSH;
strm.next_in = in;
</b></pre><!-- -->
The inner <tt>do</tt>-loop passes our chunk of input data to <tt>deflate()</tt>, and then
keeps calling <tt>deflate()</tt> until it is done producing output. Once there is no more
new output, <tt>deflate()</tt> is guaranteed to have consumed all of the input, i.e.,
<tt>avail_in</tt> will be zero.
<pre><b>
/* run deflate() on input until output buffer not full, finish
compression if all of source has been read in */
do {
</b></pre>
Output space is provided to <tt>deflate()</tt> by setting <tt>avail_out</tt> to the number
of available output bytes and <tt>next_out</tt> to a pointer to that space.
<pre><b>
strm.avail_out = CHUNK;
strm.next_out = out;
</b></pre>
Now we call the compression engine itself, <tt>deflate()</tt>. It takes as many of the
<tt>avail_in</tt> bytes at <tt>next_in</tt> as it can process, and writes as many as
<tt>avail_out</tt> bytes to <tt>next_out</tt>. Those counters and pointers are then
updated past the input data consumed and the output data written. It is the amount of
output space available that may limit how much input is consumed.
Hence the inner loop to make sure that
all of the input is consumed by providing more output space each time. Since <tt>avail_in</tt>
and <tt>next_in</tt> are updated by <tt>deflate()</tt>, we don't have to mess with those
between <tt>deflate()</tt> calls until it's all used up.
<p>
The parameters to <tt>deflate()</tt> are a pointer to the <tt>strm</tt> structure containing
the input and output information and the internal compression engine state, and a parameter
indicating whether and how to flush data to the output. Normally <tt>deflate</tt> will consume
several K bytes of input data before producing any output (except for the header), in order
to accumulate statistics on the data for optimum compression. It will then put out a burst of
compressed data, and proceed to consume more input before the next burst. Eventually,
<tt>deflate()</tt>
must be told to terminate the stream, complete the compression with provided input data, and
write out the trailer check value. <tt>deflate()</tt> will continue to compress normally as long
as the flush parameter is <tt>Z_NO_FLUSH</tt>. Once the <tt>Z_FINISH</tt> parameter is provided,
<tt>deflate()</tt> will begin to complete the compressed output stream. However depending on how
much output space is provided, <tt>deflate()</tt> may have to be called several times until it
has provided the complete compressed stream, even after it has consumed all of the input. The flush
parameter must continue to be <tt>Z_FINISH</tt> for those subsequent calls.
<p>
There are other values of the flush parameter that are used in more advanced applications. You can
force <tt>deflate()</tt> to produce a burst of output that encodes all of the input data provided
so far, even if it wouldn't have otherwise, for example to control data latency on a link with
compressed data. You can also ask that <tt>deflate()</tt> do that as well as erase any history up to
that point so that what follows can be decompressed independently, for example for random access
applications. Both requests will degrade compression by an amount depending on how often such
requests are made.
<p>
<tt>deflate()</tt> has a return value that can indicate errors, yet we do not check it here. Why
not? Well, it turns out that <tt>deflate()</tt> can do no wrong here. Let's go through
<tt>deflate()</tt>'s return values and dispense with them one by one. The possible values are
<tt>Z_OK</tt>, <tt>Z_STREAM_END</tt>, <tt>Z_STREAM_ERROR</tt>, or <tt>Z_BUF_ERROR</tt>. <tt>Z_OK</tt>
is, well, ok. <tt>Z_STREAM_END</tt> is also ok and will be returned for the last call of
<tt>deflate()</tt>. This is already guaranteed by calling <tt>deflate()</tt> with <tt>Z_FINISH</tt>
until it has no more output. <tt>Z_STREAM_ERROR</tt> is only possible if the stream is not
initialized properly, but we did initialize it properly. There is no harm in checking for
<tt>Z_STREAM_ERROR</tt> here, for example to check for the possibility that some
other part of the application inadvertently clobbered the memory containing the <em>zlib</em> state.
<tt>Z_BUF_ERROR</tt> will be explained further below, but
suffice it to say that this is simply an indication that <tt>deflate()</tt> could not consume
more input or produce more output. <tt>deflate()</tt> can be called again with more output space
or more available input, which it will be in this code.
<pre><b>
ret = deflate(&amp;strm, flush); /* no bad return value */
assert(ret != Z_STREAM_ERROR); /* state not clobbered */
</b></pre>
Now we compute how much output <tt>deflate()</tt> provided on the last call, which is the
difference between how much space was provided before the call, and how much output space
is still available after the call. Then that data, if any, is written to the output file.
We can then reuse the output buffer for the next call of <tt>deflate()</tt>. Again if there
is a file i/o error, we call <tt>deflateEnd()</tt> before returning to avoid a memory leak.
<pre><b>
have = CHUNK - strm.avail_out;
if (fwrite(out, 1, have, dest) != have || ferror(dest)) {
(void)deflateEnd(&amp;strm);
return Z_ERRNO;
}
</b></pre>
The inner <tt>do</tt>-loop is repeated until the last <tt>deflate()</tt> call fails to fill the
provided output buffer. Then we know that <tt>deflate()</tt> has done as much as it can with
the provided input, and that all of that input has been consumed. We can then fall out of this
loop and reuse the input buffer.
<p>
The way we tell that <tt>deflate()</tt> has no more output is by seeing that it did not fill
the output buffer, leaving <tt>avail_out</tt> greater than zero. However suppose that
<tt>deflate()</tt> has no more output, but just so happened to exactly fill the output buffer!
<tt>avail_out</tt> is zero, and we can't tell that <tt>deflate()</tt> has done all it can.
As far as we know, <tt>deflate()</tt>
has more output for us. So we call it again. But now <tt>deflate()</tt> produces no output
at all, and <tt>avail_out</tt> remains unchanged as <tt>CHUNK</tt>. That <tt>deflate()</tt> call
wasn't able to do anything, either consume input or produce output, and so it returns
<tt>Z_BUF_ERROR</tt>. (See, I told you I'd cover this later.) However this is not a problem at
all. Now we finally have the desired indication that <tt>deflate()</tt> is really done,
and so we drop out of the inner loop to provide more input to <tt>deflate()</tt>.
<p>
With <tt>flush</tt> set to <tt>Z_FINISH</tt>, this final set of <tt>deflate()</tt> calls will
complete the output stream. Once that is done, subsequent calls of <tt>deflate()</tt> would return
<tt>Z_STREAM_ERROR</tt> if the flush parameter is not <tt>Z_FINISH</tt>, and do no more processing
until the state is reinitialized.
<p>
Some applications of <em>zlib</em> have two loops that call <tt>deflate()</tt>
instead of the single inner loop we have here. The first loop would call
without flushing and feed all of the data to <tt>deflate()</tt>. The second loop would call
<tt>deflate()</tt> with no more
data and the <tt>Z_FINISH</tt> parameter to complete the process. As you can see from this
example, that can be avoided by simply keeping track of the current flush state.
<pre><b>
} while (strm.avail_out == 0);
assert(strm.avail_in == 0); /* all input will be used */
</b></pre><!-- -->
Now we check to see if we have already processed all of the input file. That information was
saved in the <tt>flush</tt> variable, so we see if that was set to <tt>Z_FINISH</tt>. If so,
then we're done and we fall out of the outer loop. We're guaranteed to get <tt>Z_STREAM_END</tt>
from the last <tt>deflate()</tt> call, since we ran it until the last chunk of input was
consumed and all of the output was generated.
<pre><b>
/* done when last data in file processed */
} while (flush != Z_FINISH);
assert(ret == Z_STREAM_END); /* stream will be complete */
</b></pre><!-- -->
The process is complete, but we still need to deallocate the state to avoid a memory leak
(or rather more like a memory hemorrhage if you didn't do this). Then
finally we can return with a happy return value.
<pre><b>
/* clean up and return */
(void)deflateEnd(&amp;strm);
return Z_OK;
}
</b></pre><!-- -->
Now we do the same thing for decompression in the <tt>inf()</tt> routine. <tt>inf()</tt>
decompresses what is hopefully a valid <em>zlib</em> stream from the input file and writes the
uncompressed data to the output file. Much of the discussion above for <tt>def()</tt>
applies to <tt>inf()</tt> as well, so the discussion here will focus on the differences between
the two.
<pre><b>
/* Decompress from file source to file dest until stream ends or EOF.
inf() returns Z_OK on success, Z_MEM_ERROR if memory could not be
allocated for processing, Z_DATA_ERROR if the deflate data is
invalid or incomplete, Z_VERSION_ERROR if the version of zlib.h and
the version of the library linked do not match, or Z_ERRNO if there
is an error reading or writing the files. */
int inf(FILE *source, FILE *dest)
{
</b></pre>
The local variables have the same functionality as they do for <tt>def()</tt>. The
only difference is that there is no <tt>flush</tt> variable, since <tt>inflate()</tt>
can tell from the <em>zlib</em> stream itself when the stream is complete.
<pre><b>
int ret;
unsigned have;
z_stream strm;
unsigned char in[CHUNK];
unsigned char out[CHUNK];
</b></pre><!-- -->
The initialization of the state is the same, except that there is no compression level,
of course, and two more elements of the structure are initialized. <tt>avail_in</tt>
and <tt>next_in</tt> must be initialized before calling <tt>inflateInit()</tt>. This
is because the application has the option to provide the start of the zlib stream in
order for <tt>inflateInit()</tt> to have access to information about the compression
method to aid in memory allocation. In the current implementation of <em>zlib</em>
(up through versions 1.2.x), the method-dependent memory allocations are deferred to the first call of
<tt>inflate()</tt> anyway. However those fields must be initialized since later versions
of <em>zlib</em> that provide more compression methods may take advantage of this interface.
In any case, no decompression is performed by <tt>inflateInit()</tt>, so the
<tt>avail_out</tt> and <tt>next_out</tt> fields do not need to be initialized before calling.
<p>
Here <tt>avail_in</tt> is set to zero and <tt>next_in</tt> is set to <tt>Z_NULL</tt> to
indicate that no input data is being provided.
<pre><b>
/* allocate inflate state */
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.avail_in = 0;
strm.next_in = Z_NULL;
ret = inflateInit(&amp;strm);
if (ret != Z_OK)
return ret;
</b></pre><!-- -->
The outer <tt>do</tt>-loop decompresses input until <tt>inflate()</tt> indicates
that it has reached the end of the compressed data and has produced all of the uncompressed
output. This is in contrast to <tt>def()</tt> which processes all of the input file.
If end-of-file is reached before the compressed data self-terminates, then the compressed
data is incomplete and an error is returned.
<pre><b>
/* decompress until deflate stream ends or end of file */
do {
</b></pre>
We read input data and set the <tt>strm</tt> structure accordingly. If we've reached the
end of the input file, then we leave the outer loop and report an error, since the
compressed data is incomplete. Note that we may read more data than is eventually consumed
by <tt>inflate()</tt>, if the input file continues past the <em>zlib</em> stream.
For applications where <em>zlib</em> streams are embedded in other data, this routine would
need to be modified to return the unused data, or at least indicate how much of the input
data was not used, so the application would know where to pick up after the <em>zlib</em> stream.
<pre><b>
strm.avail_in = fread(in, 1, CHUNK, source);
if (ferror(source)) {
(void)inflateEnd(&amp;strm);
return Z_ERRNO;
}
if (strm.avail_in == 0)
break;
strm.next_in = in;
</b></pre><!-- -->
The inner <tt>do</tt>-loop has the same function it did in <tt>def()</tt>, which is to
keep calling <tt>inflate()</tt> until has generated all of the output it can with the
provided input.
<pre><b>
/* run inflate() on input until output buffer not full */
do {
</b></pre>
Just like in <tt>def()</tt>, the same output space is provided for each call of <tt>inflate()</tt>.
<pre><b>
strm.avail_out = CHUNK;
strm.next_out = out;
</b></pre>
Now we run the decompression engine itself. There is no need to adjust the flush parameter, since
the <em>zlib</em> format is self-terminating. The main difference here is that there are
return values that we need to pay attention to. <tt>Z_DATA_ERROR</tt>
indicates that <tt>inflate()</tt> detected an error in the <em>zlib</em> compressed data format,
which means that either the data is not a <em>zlib</em> stream to begin with, or that the data was
corrupted somewhere along the way since it was compressed. The other error to be processed is
<tt>Z_MEM_ERROR</tt>, which can occur since memory allocation is deferred until <tt>inflate()</tt>
needs it, unlike <tt>deflate()</tt>, whose memory is allocated at the start by <tt>deflateInit()</tt>.
<p>
Advanced applications may use
<tt>deflateSetDictionary()</tt> to prime <tt>deflate()</tt> with a set of likely data to improve the
first 32K or so of compression. This is noted in the <em>zlib</em> header, so <tt>inflate()</tt>
requests that that dictionary be provided before it can start to decompress. Without the dictionary,
correct decompression is not possible. For this routine, we have no idea what the dictionary is,
so the <tt>Z_NEED_DICT</tt> indication is converted to a <tt>Z_DATA_ERROR</tt>.
<p>
<tt>inflate()</tt> can also return <tt>Z_STREAM_ERROR</tt>, which should not be possible here,
but could be checked for as noted above for <tt>def()</tt>. <tt>Z_BUF_ERROR</tt> does not need to be
checked for here, for the same reasons noted for <tt>def()</tt>. <tt>Z_STREAM_END</tt> will be
checked for later.
<pre><b>
ret = inflate(&amp;strm, Z_NO_FLUSH);
assert(ret != Z_STREAM_ERROR); /* state not clobbered */
switch (ret) {
case Z_NEED_DICT:
ret = Z_DATA_ERROR; /* and fall through */
case Z_DATA_ERROR:
case Z_MEM_ERROR:
(void)inflateEnd(&amp;strm);
return ret;
}
</b></pre>
The output of <tt>inflate()</tt> is handled identically to that of <tt>deflate()</tt>.
<pre><b>
have = CHUNK - strm.avail_out;
if (fwrite(out, 1, have, dest) != have || ferror(dest)) {
(void)inflateEnd(&amp;strm);
return Z_ERRNO;
}
</b></pre>
The inner <tt>do</tt>-loop ends when <tt>inflate()</tt> has no more output as indicated
by not filling the output buffer, just as for <tt>deflate()</tt>. In this case, we cannot
assert that <tt>strm.avail_in</tt> will be zero, since the deflate stream may end before the file
does.
<pre><b>
} while (strm.avail_out == 0);
</b></pre><!-- -->
The outer <tt>do</tt>-loop ends when <tt>inflate()</tt> reports that it has reached the
end of the input <em>zlib</em> stream, has completed the decompression and integrity
check, and has provided all of the output. This is indicated by the <tt>inflate()</tt>
return value <tt>Z_STREAM_END</tt>. The inner loop is guaranteed to leave <tt>ret</tt>
equal to <tt>Z_STREAM_END</tt> if the last chunk of the input file read contained the end
of the <em>zlib</em> stream. So if the return value is not <tt>Z_STREAM_END</tt>, the
loop continues to read more input.
<pre><b>
/* done when inflate() says it's done */
} while (ret != Z_STREAM_END);
</b></pre><!-- -->
At this point, decompression successfully completed, or we broke out of the loop due to no
more data being available from the input file. If the last <tt>inflate()</tt> return value
is not <tt>Z_STREAM_END</tt>, then the <em>zlib</em> stream was incomplete and a data error
is returned. Otherwise, we return with a happy return value. Of course, <tt>inflateEnd()</tt>
is called first to avoid a memory leak.
<pre><b>
/* clean up and return */
(void)inflateEnd(&amp;strm);
return ret == Z_STREAM_END ? Z_OK : Z_DATA_ERROR;
}
</b></pre><!-- -->
That ends the routines that directly use <em>zlib</em>. The following routines make this
a command-line program by running data through the above routines from <tt>stdin</tt> to
<tt>stdout</tt>, and handling any errors reported by <tt>def()</tt> or <tt>inf()</tt>.
<p>
<tt>zerr()</tt> is used to interpret the possible error codes from <tt>def()</tt>
and <tt>inf()</tt>, as detailed in their comments above, and print out an error message.
Note that these are only a subset of the possible return values from <tt>deflate()</tt>
and <tt>inflate()</tt>.
<pre><b>
/* report a zlib or i/o error */
void zerr(int ret)
{
fputs("zpipe: ", stderr);
switch (ret) {
case Z_ERRNO:
if (ferror(stdin))
fputs("error reading stdin\n", stderr);
if (ferror(stdout))
fputs("error writing stdout\n", stderr);
break;
case Z_STREAM_ERROR:
fputs("invalid compression level\n", stderr);
break;
case Z_DATA_ERROR:
fputs("invalid or incomplete deflate data\n", stderr);
break;
case Z_MEM_ERROR:
fputs("out of memory\n", stderr);
break;
case Z_VERSION_ERROR:
fputs("zlib version mismatch!\n", stderr);
}
}
</b></pre><!-- -->
Here is the <tt>main()</tt> routine used to test <tt>def()</tt> and <tt>inf()</tt>. The
<tt>zpipe</tt> command is simply a compression pipe from <tt>stdin</tt> to <tt>stdout</tt>, if
no arguments are given, or it is a decompression pipe if <tt>zpipe -d</tt> is used. If any other
arguments are provided, no compression or decompression is performed. Instead a usage
message is displayed. Examples are <tt>zpipe < foo.txt > foo.txt.z</tt> to compress, and
<tt>zpipe -d < foo.txt.z > foo.txt</tt> to decompress.
<pre><b>
/* compress or decompress from stdin to stdout */
int main(int argc, char **argv)
{
int ret;
/* avoid end-of-line conversions */
SET_BINARY_MODE(stdin);
SET_BINARY_MODE(stdout);
/* do compression if no arguments */
if (argc == 1) {
ret = def(stdin, stdout, Z_DEFAULT_COMPRESSION);
if (ret != Z_OK)
zerr(ret);
return ret;
}
/* do decompression if -d specified */
else if (argc == 2 &amp;&amp; strcmp(argv[1], "-d") == 0) {
ret = inf(stdin, stdout);
if (ret != Z_OK)
zerr(ret);
return ret;
}
/* otherwise, report usage */
else {
fputs("zpipe usage: zpipe [-d] &lt; source &gt; dest\n", stderr);
return 1;
}
}
</b></pre>
<hr>
<i>Copyright (c) 2004, 2005 by Mark Adler<br>Last modified 11 December 2005</i>
</body>
</html>

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/* zpipe.c: example of proper use of zlib's inflate() and deflate()
Not copyrighted -- provided to the public domain
Version 1.4 11 December 2005 Mark Adler */
/* Version history:
1.0 30 Oct 2004 First version
1.1 8 Nov 2004 Add void casting for unused return values
Use switch statement for inflate() return values
1.2 9 Nov 2004 Add assertions to document zlib guarantees
1.3 6 Apr 2005 Remove incorrect assertion in inf()
1.4 11 Dec 2005 Add hack to avoid MSDOS end-of-line conversions
Avoid some compiler warnings for input and output buffers
*/
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include "zlib.h"
#if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__)
# include <fcntl.h>
# include <io.h>
# define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
#else
# define SET_BINARY_MODE(file)
#endif
#define CHUNK 16384
/* Compress from file source to file dest until EOF on source.
def() returns Z_OK on success, Z_MEM_ERROR if memory could not be
allocated for processing, Z_STREAM_ERROR if an invalid compression
level is supplied, Z_VERSION_ERROR if the version of zlib.h and the
version of the library linked do not match, or Z_ERRNO if there is
an error reading or writing the files. */
int def(FILE *source, FILE *dest, int level)
{
int ret, flush;
unsigned have;
z_stream strm;
unsigned char in[CHUNK];
unsigned char out[CHUNK];
/* allocate deflate state */
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
ret = deflateInit(&strm, level);
if (ret != Z_OK)
return ret;
/* compress until end of file */
do {
strm.avail_in = fread(in, 1, CHUNK, source);
if (ferror(source)) {
(void)deflateEnd(&strm);
return Z_ERRNO;
}
flush = feof(source) ? Z_FINISH : Z_NO_FLUSH;
strm.next_in = in;
/* run deflate() on input until output buffer not full, finish
compression if all of source has been read in */
do {
strm.avail_out = CHUNK;
strm.next_out = out;
ret = deflate(&strm, flush); /* no bad return value */
assert(ret != Z_STREAM_ERROR); /* state not clobbered */
have = CHUNK - strm.avail_out;
if (fwrite(out, 1, have, dest) != have || ferror(dest)) {
(void)deflateEnd(&strm);
return Z_ERRNO;
}
} while (strm.avail_out == 0);
assert(strm.avail_in == 0); /* all input will be used */
/* done when last data in file processed */
} while (flush != Z_FINISH);
assert(ret == Z_STREAM_END); /* stream will be complete */
/* clean up and return */
(void)deflateEnd(&strm);
return Z_OK;
}
/* Decompress from file source to file dest until stream ends or EOF.
inf() returns Z_OK on success, Z_MEM_ERROR if memory could not be
allocated for processing, Z_DATA_ERROR if the deflate data is
invalid or incomplete, Z_VERSION_ERROR if the version of zlib.h and
the version of the library linked do not match, or Z_ERRNO if there
is an error reading or writing the files. */
int inf(FILE *source, FILE *dest)
{
int ret;
unsigned have;
z_stream strm;
unsigned char in[CHUNK];
unsigned char out[CHUNK];
/* allocate inflate state */
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.avail_in = 0;
strm.next_in = Z_NULL;
ret = inflateInit(&strm);
if (ret != Z_OK)
return ret;
/* decompress until deflate stream ends or end of file */
do {
strm.avail_in = fread(in, 1, CHUNK, source);
if (ferror(source)) {
(void)inflateEnd(&strm);
return Z_ERRNO;
}
if (strm.avail_in == 0)
break;
strm.next_in = in;
/* run inflate() on input until output buffer not full */
do {
strm.avail_out = CHUNK;
strm.next_out = out;
ret = inflate(&strm, Z_NO_FLUSH);
assert(ret != Z_STREAM_ERROR); /* state not clobbered */
switch (ret) {
case Z_NEED_DICT:
ret = Z_DATA_ERROR; /* and fall through */
case Z_DATA_ERROR:
case Z_MEM_ERROR:
(void)inflateEnd(&strm);
return ret;
}
have = CHUNK - strm.avail_out;
if (fwrite(out, 1, have, dest) != have || ferror(dest)) {
(void)inflateEnd(&strm);
return Z_ERRNO;
}
} while (strm.avail_out == 0);
/* done when inflate() says it's done */
} while (ret != Z_STREAM_END);
/* clean up and return */
(void)inflateEnd(&strm);
return ret == Z_STREAM_END ? Z_OK : Z_DATA_ERROR;
}
/* report a zlib or i/o error */
void zerr(int ret)
{
fputs("zpipe: ", stderr);
switch (ret) {
case Z_ERRNO:
if (ferror(stdin))
fputs("error reading stdin\n", stderr);
if (ferror(stdout))
fputs("error writing stdout\n", stderr);
break;
case Z_STREAM_ERROR:
fputs("invalid compression level\n", stderr);
break;
case Z_DATA_ERROR:
fputs("invalid or incomplete deflate data\n", stderr);
break;
case Z_MEM_ERROR:
fputs("out of memory\n", stderr);
break;
case Z_VERSION_ERROR:
fputs("zlib version mismatch!\n", stderr);
}
}
/* compress or decompress from stdin to stdout */
int main(int argc, char **argv)
{
int ret;
/* avoid end-of-line conversions */
SET_BINARY_MODE(stdin);
SET_BINARY_MODE(stdout);
/* do compression if no arguments */
if (argc == 1) {
ret = def(stdin, stdout, Z_DEFAULT_COMPRESSION);
if (ret != Z_OK)
zerr(ret);
return ret;
}
/* do decompression if -d specified */
else if (argc == 2 && strcmp(argv[1], "-d") == 0) {
ret = inf(stdin, stdout);
if (ret != Z_OK)
zerr(ret);
return ret;
}
/* otherwise, report usage */
else {
fputs("zpipe usage: zpipe [-d] < source > dest\n", stderr);
return 1;
}
}

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/* zran.c -- example of zlib/gzip stream indexing and random access
* Copyright (C) 2005, 2012, 2018 Mark Adler
* For conditions of distribution and use, see copyright notice in zlib.h
* Version 1.2 14 Oct 2018 Mark Adler */
/* Version History:
1.0 29 May 2005 First version
1.1 29 Sep 2012 Fix memory reallocation error
1.2 14 Oct 2018 Handle gzip streams with multiple members
Add a header file to facilitate usage in applications
*/
/* Illustrate the use of Z_BLOCK, inflatePrime(), and inflateSetDictionary()
for random access of a compressed file. A file containing a zlib or gzip
stream is provided on the command line. The compressed stream is decoded in
its entirety, and an index built with access points about every SPAN bytes
in the uncompressed output. The compressed file is left open, and can then
be read randomly, having to decompress on the average SPAN/2 uncompressed
bytes before getting to the desired block of data.
An access point can be created at the start of any deflate block, by saving
the starting file offset and bit of that block, and the 32K bytes of
uncompressed data that precede that block. Also the uncompressed offset of
that block is saved to provide a reference for locating a desired starting
point in the uncompressed stream. deflate_index_build() works by
decompressing the input zlib or gzip stream a block at a time, and at the
end of each block deciding if enough uncompressed data has gone by to
justify the creation of a new access point. If so, that point is saved in a
data structure that grows as needed to accommodate the points.
To use the index, an offset in the uncompressed data is provided, for which
the latest access point at or preceding that offset is located in the index.
The input file is positioned to the specified location in the index, and if
necessary the first few bits of the compressed data is read from the file.
inflate is initialized with those bits and the 32K of uncompressed data, and
the decompression then proceeds until the desired offset in the file is
reached. Then the decompression continues to read the desired uncompressed
data from the file.
Another approach would be to generate the index on demand. In that case,
requests for random access reads from the compressed data would try to use
the index, but if a read far enough past the end of the index is required,
then further index entries would be generated and added.
There is some fair bit of overhead to starting inflation for the random
access, mainly copying the 32K byte dictionary. So if small pieces of the
file are being accessed, it would make sense to implement a cache to hold
some lookahead and avoid many calls to deflate_index_extract() for small
lengths.
Another way to build an index would be to use inflateCopy(). That would
not be constrained to have access points at block boundaries, but requires
more memory per access point, and also cannot be saved to file due to the
use of pointers in the state. The approach here allows for storage of the
index in a file.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "zlib.h"
#include "zran.h"
#define WINSIZE 32768U /* sliding window size */
#define CHUNK 16384 /* file input buffer size */
/* Access point entry. */
struct point {
off_t out; /* corresponding offset in uncompressed data */
off_t in; /* offset in input file of first full byte */
int bits; /* number of bits (1-7) from byte at in-1, or 0 */
unsigned char window[WINSIZE]; /* preceding 32K of uncompressed data */
};
/* See comments in zran.h. */
void deflate_index_free(struct deflate_index *index)
{
if (index != NULL) {
free(index->list);
free(index);
}
}
/* Add an entry to the access point list. If out of memory, deallocate the
existing list and return NULL. index->gzip is the allocated size of the
index in point entries, until it is time for deflate_index_build() to
return, at which point gzip is set to indicate a gzip file or not.
*/
static struct deflate_index *addpoint(struct deflate_index *index, int bits,
off_t in, off_t out, unsigned left,
unsigned char *window)
{
struct point *next;
/* if list is empty, create it (start with eight points) */
if (index == NULL) {
index = malloc(sizeof(struct deflate_index));
if (index == NULL) return NULL;
index->list = malloc(sizeof(struct point) << 3);
if (index->list == NULL) {
free(index);
return NULL;
}
index->gzip = 8;
index->have = 0;
}
/* if list is full, make it bigger */
else if (index->have == index->gzip) {
index->gzip <<= 1;
next = realloc(index->list, sizeof(struct point) * index->gzip);
if (next == NULL) {
deflate_index_free(index);
return NULL;
}
index->list = next;
}
/* fill in entry and increment how many we have */
next = (struct point *)(index->list) + index->have;
next->bits = bits;
next->in = in;
next->out = out;
if (left)
memcpy(next->window, window + WINSIZE - left, left);
if (left < WINSIZE)
memcpy(next->window + left, window, WINSIZE - left);
index->have++;
/* return list, possibly reallocated */
return index;
}
/* See comments in zran.h. */
int deflate_index_build(FILE *in, off_t span, struct deflate_index **built)
{
int ret;
int gzip = 0; /* true if reading a gzip file */
off_t totin, totout; /* our own total counters to avoid 4GB limit */
off_t last; /* totout value of last access point */
struct deflate_index *index; /* access points being generated */
z_stream strm;
unsigned char input[CHUNK];
unsigned char window[WINSIZE];
/* initialize inflate */
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.avail_in = 0;
strm.next_in = Z_NULL;
ret = inflateInit2(&strm, 47); /* automatic zlib or gzip decoding */
if (ret != Z_OK)
return ret;
/* inflate the input, maintain a sliding window, and build an index -- this
also validates the integrity of the compressed data using the check
information in the gzip or zlib stream */
totin = totout = last = 0;
index = NULL; /* will be allocated by first addpoint() */
strm.avail_out = 0;
do {
/* get some compressed data from input file */
strm.avail_in = fread(input, 1, CHUNK, in);
if (ferror(in)) {
ret = Z_ERRNO;
goto deflate_index_build_error;
}
if (strm.avail_in == 0) {
ret = Z_DATA_ERROR;
goto deflate_index_build_error;
}
strm.next_in = input;
/* check for a gzip stream */
if (totin == 0 && strm.avail_in >= 3 &&
input[0] == 31 && input[1] == 139 && input[2] == 8)
gzip = 1;
/* process all of that, or until end of stream */
do {
/* reset sliding window if necessary */
if (strm.avail_out == 0) {
strm.avail_out = WINSIZE;
strm.next_out = window;
}
/* inflate until out of input, output, or at end of block --
update the total input and output counters */
totin += strm.avail_in;
totout += strm.avail_out;
ret = inflate(&strm, Z_BLOCK); /* return at end of block */
totin -= strm.avail_in;
totout -= strm.avail_out;
if (ret == Z_NEED_DICT)
ret = Z_DATA_ERROR;
if (ret == Z_MEM_ERROR || ret == Z_DATA_ERROR)
goto deflate_index_build_error;
if (ret == Z_STREAM_END) {
if (gzip &&
(strm.avail_in || ungetc(getc(in), in) != EOF)) {
ret = inflateReset(&strm);
if (ret != Z_OK)
goto deflate_index_build_error;
continue;
}
break;
}
/* if at end of block, consider adding an index entry (note that if
data_type indicates an end-of-block, then all of the
uncompressed data from that block has been delivered, and none
of the compressed data after that block has been consumed,
except for up to seven bits) -- the totout == 0 provides an
entry point after the zlib or gzip header, and assures that the
index always has at least one access point; we avoid creating an
access point after the last block by checking bit 6 of data_type
*/
if ((strm.data_type & 128) && !(strm.data_type & 64) &&
(totout == 0 || totout - last > span)) {
index = addpoint(index, strm.data_type & 7, totin,
totout, strm.avail_out, window);
if (index == NULL) {
ret = Z_MEM_ERROR;
goto deflate_index_build_error;
}
last = totout;
}
} while (strm.avail_in != 0);
} while (ret != Z_STREAM_END);
/* clean up and return index (release unused entries in list) */
(void)inflateEnd(&strm);
index->list = realloc(index->list, sizeof(struct point) * index->have);
index->gzip = gzip;
index->length = totout;
*built = index;
return index->have;
/* return error */
deflate_index_build_error:
(void)inflateEnd(&strm);
deflate_index_free(index);
return ret;
}
/* See comments in zran.h. */
int deflate_index_extract(FILE *in, struct deflate_index *index, off_t offset,
unsigned char *buf, int len)
{
int ret, skip;
z_stream strm;
struct point *here;
unsigned char input[CHUNK];
unsigned char discard[WINSIZE];
/* proceed only if something reasonable to do */
if (len < 0)
return 0;
/* find where in stream to start */
here = index->list;
ret = index->have;
while (--ret && here[1].out <= offset)
here++;
/* initialize file and inflate state to start there */
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.avail_in = 0;
strm.next_in = Z_NULL;
ret = inflateInit2(&strm, -15); /* raw inflate */
if (ret != Z_OK)
return ret;
ret = fseeko(in, here->in - (here->bits ? 1 : 0), SEEK_SET);
if (ret == -1)
goto deflate_index_extract_ret;
if (here->bits) {
ret = getc(in);
if (ret == -1) {
ret = ferror(in) ? Z_ERRNO : Z_DATA_ERROR;
goto deflate_index_extract_ret;
}
(void)inflatePrime(&strm, here->bits, ret >> (8 - here->bits));
}
(void)inflateSetDictionary(&strm, here->window, WINSIZE);
/* skip uncompressed bytes until offset reached, then satisfy request */
offset -= here->out;
strm.avail_in = 0;
skip = 1; /* while skipping to offset */
do {
/* define where to put uncompressed data, and how much */
if (offset > WINSIZE) { /* skip WINSIZE bytes */
strm.avail_out = WINSIZE;
strm.next_out = discard;
offset -= WINSIZE;
}
else if (offset > 0) { /* last skip */
strm.avail_out = (unsigned)offset;
strm.next_out = discard;
offset = 0;
}
else if (skip) { /* at offset now */
strm.avail_out = len;
strm.next_out = buf;
skip = 0; /* only do this once */
}
/* uncompress until avail_out filled, or end of stream */
do {
if (strm.avail_in == 0) {
strm.avail_in = fread(input, 1, CHUNK, in);
if (ferror(in)) {
ret = Z_ERRNO;
goto deflate_index_extract_ret;
}
if (strm.avail_in == 0) {
ret = Z_DATA_ERROR;
goto deflate_index_extract_ret;
}
strm.next_in = input;
}
ret = inflate(&strm, Z_NO_FLUSH); /* normal inflate */
if (ret == Z_NEED_DICT)
ret = Z_DATA_ERROR;
if (ret == Z_MEM_ERROR || ret == Z_DATA_ERROR)
goto deflate_index_extract_ret;
if (ret == Z_STREAM_END) {
/* the raw deflate stream has ended */
if (index->gzip == 0)
/* this is a zlib stream that has ended -- done */
break;
/* near the end of a gzip member, which might be followed by
another gzip member -- skip the gzip trailer and see if
there is more input after it */
if (strm.avail_in < 8) {
fseeko(in, 8 - strm.avail_in, SEEK_CUR);
strm.avail_in = 0;
}
else {
strm.avail_in -= 8;
strm.next_in += 8;
}
if (strm.avail_in == 0 && ungetc(getc(in), in) == EOF)
/* the input ended after the gzip trailer -- done */
break;
/* there is more input, so another gzip member should follow --
validate and skip the gzip header */
ret = inflateReset2(&strm, 31);
if (ret != Z_OK)
goto deflate_index_extract_ret;
do {
if (strm.avail_in == 0) {
strm.avail_in = fread(input, 1, CHUNK, in);
if (ferror(in)) {
ret = Z_ERRNO;
goto deflate_index_extract_ret;
}
if (strm.avail_in == 0) {
ret = Z_DATA_ERROR;
goto deflate_index_extract_ret;
}
strm.next_in = input;
}
ret = inflate(&strm, Z_BLOCK);
if (ret == Z_MEM_ERROR || ret == Z_DATA_ERROR)
goto deflate_index_extract_ret;
} while ((strm.data_type & 128) == 0);
/* set up to continue decompression of the raw deflate stream
that follows the gzip header */
ret = inflateReset2(&strm, -15);
if (ret != Z_OK)
goto deflate_index_extract_ret;
}
/* continue to process the available input before reading more */
} while (strm.avail_out != 0);
if (ret == Z_STREAM_END)
/* reached the end of the compressed data -- return the data that
was available, possibly less than requested */
break;
/* do until offset reached and requested data read */
} while (skip);
/* compute the number of uncompressed bytes read after the offset */
ret = skip ? 0 : len - strm.avail_out;
/* clean up and return the bytes read, or the negative error */
deflate_index_extract_ret:
(void)inflateEnd(&strm);
return ret;
}
#ifdef TEST
#define SPAN 1048576L /* desired distance between access points */
#define LEN 16384 /* number of bytes to extract */
/* Demonstrate the use of deflate_index_build() and deflate_index_extract() by
processing the file provided on the command line, and extracting LEN bytes
from 2/3rds of the way through the uncompressed output, writing that to
stdout. An offset can be provided as the second argument, in which case the
data is extracted from there instead. */
int main(int argc, char **argv)
{
int len;
off_t offset = -1;
FILE *in;
struct deflate_index *index = NULL;
unsigned char buf[LEN];
/* open input file */
if (argc < 2 || argc > 3) {
fprintf(stderr, "usage: zran file.gz [offset]\n");
return 1;
}
in = fopen(argv[1], "rb");
if (in == NULL) {
fprintf(stderr, "zran: could not open %s for reading\n", argv[1]);
return 1;
}
/* get optional offset */
if (argc == 3) {
char *end;
offset = strtoll(argv[2], &end, 10);
if (*end || offset < 0) {
fprintf(stderr, "zran: %s is not a valid offset\n", argv[2]);
return 1;
}
}
/* build index */
len = deflate_index_build(in, SPAN, &index);
if (len < 0) {
fclose(in);
switch (len) {
case Z_MEM_ERROR:
fprintf(stderr, "zran: out of memory\n");
break;
case Z_DATA_ERROR:
fprintf(stderr, "zran: compressed data error in %s\n", argv[1]);
break;
case Z_ERRNO:
fprintf(stderr, "zran: read error on %s\n", argv[1]);
break;
default:
fprintf(stderr, "zran: error %d while building index\n", len);
}
return 1;
}
fprintf(stderr, "zran: built index with %d access points\n", len);
/* use index by reading some bytes from an arbitrary offset */
if (offset == -1)
offset = (index->length << 1) / 3;
len = deflate_index_extract(in, index, offset, buf, LEN);
if (len < 0)
fprintf(stderr, "zran: extraction failed: %s error\n",
len == Z_MEM_ERROR ? "out of memory" : "input corrupted");
else {
fwrite(buf, 1, len, stdout);
fprintf(stderr, "zran: extracted %d bytes at %llu\n", len, offset);
}
/* clean up and exit */
deflate_index_free(index);
fclose(in);
return 0;
}
#endif

40
libz/examples/zran.h Normal file
View File

@@ -0,0 +1,40 @@
/* zran.h -- example of zlib/gzip stream indexing and random access
* Copyright (C) 2005, 2012, 2018 Mark Adler
* For conditions of distribution and use, see copyright notice in zlib.h
* Version 1.2 14 Oct 2018 Mark Adler */
#include <stdio.h>
#include "zlib.h"
/* Access point list. */
struct deflate_index {
int have; /* number of list entries */
int gzip; /* 1 if the index is of a gzip file, 0 if it is of a
zlib stream */
off_t length; /* total length of uncompressed data */
void *list; /* allocated list of entries */
};
/* Make one entire pass through a zlib or gzip compressed stream and build an
index, with access points about every span bytes of uncompressed output.
gzip files with multiple members are indexed in their entirety. span should
be chosen to balance the speed of random access against the memory
requirements of the list, about 32K bytes per access point. The return value
is the number of access points on success (>= 1), Z_MEM_ERROR for out of
memory, Z_DATA_ERROR for an error in the input file, or Z_ERRNO for a file
read error. On success, *built points to the resulting index. */
int deflate_index_build(FILE *in, off_t span, struct deflate_index **built);
/* Deallocate an index built by deflate_index_build() */
void deflate_index_free(struct deflate_index *index);
/* Use the index to read len bytes from offset into buf. Return bytes read or
negative for error (Z_DATA_ERROR or Z_MEM_ERROR). If data is requested past
the end of the uncompressed data, then deflate_index_extract() will return a
value less than len, indicating how much was actually read into buf. This
function should not return a data error unless the file was modified since
the index was generated, since deflate_index_build() validated all of the
input. deflate_index_extract() will return Z_ERRNO if there is an error on
reading or seeking the input file. */
int deflate_index_extract(FILE *in, struct deflate_index *index, off_t offset,
unsigned char *buf, int len);

2
libz/gzlib.c
View File

@@ -30,7 +30,7 @@ local gzFile gz_open OF((const void *, int, const char *));
The gz_strwinerror function does not change the current setting of
GetLastError. */
char ZLIB_INTERNAL *gz_strwinerror (error)
char ZLIB_INTERNAL *gz_strwinerror(error)
DWORD error;
{
static char buf[1024];

8
libz/gzread.c
View File

@@ -157,11 +157,9 @@ local int gz_look(state)
the output buffer is larger than the input buffer, which also assures
space for gzungetc() */
state->x.next = state->out;
if (strm->avail_in) {
memcpy(state->x.next, strm->next_in, strm->avail_in);
state->x.have = strm->avail_in;
strm->avail_in = 0;
}
memcpy(state->x.next, strm->next_in, strm->avail_in);
state->x.have = strm->avail_in;
strm->avail_in = 0;
state->how = COPY;
state->direct = 1;
return 0;

2
libz/gzwrite.c
View File

@@ -474,7 +474,7 @@ int ZEXPORTVA gzprintf(gzFile file, const char *format, ...)
#else /* !STDC && !Z_HAVE_STDARG_H */
/* -- see zlib.h -- */
int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
int ZEXPORTVA gzprintf(file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
a11, a12, a13, a14, a15, a16, a17, a18, a19, a20)
gzFile file;
const char *format;

17
libz/infback.c
View File

@@ -66,6 +66,7 @@ int stream_size;
state->window = window;
state->wnext = 0;
state->whave = 0;
state->sane = 1;
return Z_OK;
}
@@ -605,25 +606,27 @@ void FAR *out_desc;
break;
case DONE:
/* inflate stream terminated properly -- write leftover output */
/* inflate stream terminated properly */
ret = Z_STREAM_END;
if (left < state->wsize) {
if (out(out_desc, state->window, state->wsize - left))
ret = Z_BUF_ERROR;
}
goto inf_leave;
case BAD:
ret = Z_DATA_ERROR;
goto inf_leave;
default: /* can't happen, but makes compilers happy */
default:
/* can't happen, but makes compilers happy */
ret = Z_STREAM_ERROR;
goto inf_leave;
}
/* Return unused input */
/* Write leftover output and return unused input */
inf_leave:
if (left < state->wsize) {
if (out(out_desc, state->window, state->wsize - left) &&
ret == Z_STREAM_END)
ret = Z_BUF_ERROR;
}
strm->next_in = next;
strm->avail_in = have;
return ret;

7
libz/inflate.c
View File

@@ -168,6 +168,8 @@ int windowBits;
/* extract wrap request from windowBits parameter */
if (windowBits < 0) {
if (windowBits < -15)
return Z_STREAM_ERROR;
wrap = 0;
windowBits = -windowBits;
}
@@ -764,8 +766,9 @@ int flush;
if (copy > have) copy = have;
if (copy) {
if (state->head != Z_NULL &&
state->head->extra != Z_NULL) {
len = state->head->extra_len - state->length;
state->head->extra != Z_NULL &&
(len = state->head->extra_len - state->length) <
state->head->extra_max) {
zmemcpy(state->head->extra + len, next,
len + copy > state->head->extra_max ?
state->head->extra_max - len : copy);

4
libz/inftrees.c
View File

@@ -9,7 +9,7 @@
#define MAXBITS 15
const char inflate_copyright[] =
" inflate 1.2.12 Copyright 1995-2022 Mark Adler ";
" inflate 1.2.13 Copyright 1995-2022 Mark Adler ";
/*
If you use the zlib library in a product, an acknowledgment is welcome
in the documentation of your product. If for some reason you cannot
@@ -62,7 +62,7 @@ unsigned short FAR *work;
35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0};
static const unsigned short lext[31] = { /* Length codes 257..285 extra */
16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 18,
19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 16, 199, 202};
19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 16, 194, 65};
static const unsigned short dbase[32] = { /* Distance codes 0..29 base */
1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,

2
libz/inftrees.h
View File

@@ -38,7 +38,7 @@ typedef struct {
/* Maximum size of the dynamic table. The maximum number of code structures is
1444, which is the sum of 852 for literal/length codes and 592 for distance
codes. These values were found by exhaustive searches using the program
examples/enough.c found in the zlib distribtution. The arguments to that
examples/enough.c found in the zlib distribution. The arguments to that
program are the number of symbols, the initial root table size, and the
maximum bit length of a code. "enough 286 9 15" for literal/length codes
returns returns 852, and "enough 30 6 15" for distance codes returns 592.

4
libz/make_vms.com
View File

@@ -14,9 +14,9 @@ $! 0.02 20061008 Adapt to new Makefile.in
$! 0.03 20091224 Add support for large file check
$! 0.04 20100110 Add new gzclose, gzlib, gzread, gzwrite
$! 0.05 20100221 Exchange zlibdefs.h by zconf.h.in
$! 0.06 20120111 Fix missing amiss_err, update zconf_h.in, fix new exmples
$! 0.06 20120111 Fix missing amiss_err, update zconf_h.in, fix new examples
$! subdir path, update module search in makefile.in
$! 0.07 20120115 Triggered by work done by Alexey Chupahin completly redesigned
$! 0.07 20120115 Triggered by work done by Alexey Chupahin completely redesigned
$! shared image creation
$! 0.08 20120219 Make it work on VAX again, pre-load missing symbols to shared
$! image

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