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More string.sub vs. string.byte optimizations

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nnposter
2018-08-19 01:49:08 +00:00
parent 57a17415b7
commit 19693c334c
3 changed files with 4 additions and 9 deletions
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9
nselib/mssql.lua
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@@ -1718,13 +1718,8 @@ PreLoginPacket =
end end
if ( optionType == PreLoginPacket.OPTION_TYPE.Version ) then if ( optionType == PreLoginPacket.OPTION_TYPE.Version ) then
local major, minor, build, subBuild, version local major, minor, build, subBuild = (">BBI2I2"):unpack(optionData)
major = string.byte( optionData:sub( 1, 1 ) ) local version = SqlServerVersionInfo:new()
minor = string.byte( optionData:sub( 2, 2 ) )
build = (string.byte( optionData:sub( 3, 3 ) ) * 256) + string.byte( optionData:sub( 4, 4 ) )
subBuild = (string.byte( optionData:sub( 5, 5 ) ) * 256) + string.byte( optionData:sub( 6, 6 ) )
version = SqlServerVersionInfo:new()
version:SetVersion( major, minor, build, subBuild, "SSNetLib" ) version:SetVersion( major, minor, build, subBuild, "SSNetLib" )
preLoginPacket.versionInfo = version preLoginPacket.versionInfo = version
elseif ( optionType == PreLoginPacket.OPTION_TYPE.Encryption ) then elseif ( optionType == PreLoginPacket.OPTION_TYPE.Encryption ) then

2
nselib/smb.lua
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@@ -3482,7 +3482,7 @@ function get_uniqueish_name(host, extension, seed)
local str = lhost .. (seed or "") .. (extension or "") .. (nmap.registry.args.randomseed or "") local str = lhost .. (seed or "") .. (extension or "") .. (nmap.registry.args.randomseed or "")
for i = 1, #str, 1 do for i = 1, #str, 1 do
local chr = string.byte(string.sub(str, i, i), 1) local chr = str:byte(i)
hash = bit.bxor(hash, chr) hash = bit.bxor(hash, chr)
hash = bit.bor(bit.lshift(hash, 3), bit.rshift(hash, 29)) hash = bit.bor(bit.lshift(hash, 3), bit.rshift(hash, 29))
hash = bit.bxor(hash, 3) hash = bit.bxor(hash, 3)

2
scripts/vtam-enum.nse
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@@ -87,7 +87,7 @@ local function screen_diff( orig_screen, current_screen )
if #orig_screen == 0 or #current_screen == 0 then return 0 end if #orig_screen == 0 or #current_screen == 0 then return 0 end
local m = 1 local m = 1
for i =1 , #orig_screen do for i =1 , #orig_screen do
if orig_screen:sub(i,i) == current_screen:sub(i,i) then if orig_screen:byte(i) == current_screen:byte(i) then
m = m + 1 m = m + 1
end end
end end