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Replace ipOps.hex_to_bin with a simpler implementation.

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dmiller
2014-12-03 04:15:08 +00:00
parent e50e802c4b
commit 08709b41dc
1 changed files with 4 additions and 11 deletions
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15
nselib/ipOps.lua
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@@ -9,8 +9,7 @@ local stdnse = require "stdnse"
local string = require "string" local string = require "string"
local table = require "table" local table = require "table"
local type = type local type = type
local table = table local select = select
local string = string
local ipairs = ipairs local ipairs = ipairs
local tonumber = tonumber local tonumber = tonumber
local unittest = require "unittest" local unittest = require "unittest"
@@ -635,8 +634,7 @@ end
-- Converts a string of hexadecimal digits into the corresponding string of -- Converts a string of hexadecimal digits into the corresponding string of
-- binary digits. -- binary digits.
-- --
-- Each hex digit results in four bits. This function is really just a wrapper -- Each hex digit results in four bits.
-- around <code>stdnse.tobinary</code>.
-- @param hex String representing a hexadecimal number. -- @param hex String representing a hexadecimal number.
-- @usage -- @usage
-- bin_string = ipOps.hex_to_bin( "F00D" ) -- bin_string = ipOps.hex_to_bin( "F00D" )
@@ -649,13 +647,8 @@ hex_to_bin = function( hex )
return nil, "Error in ipOps.hex_to_bin: Expected string representing a hexadecimal number." return nil, "Error in ipOps.hex_to_bin: Expected string representing a hexadecimal number."
end end
local t, mask, binchar = {}, "0000" local d = bin.pack("H", hex)
for hexchar in string.gmatch( hex, "%x" ) do return select(2, bin.unpack("B" .. #d, d))
binchar = stdnse.tobinary( tonumber( hexchar, 16 ) )
t[#t+1] = mask:sub( 1, # mask - # binchar ) .. binchar
end
return table.concat( t )
end end
--Ignore the rest if we are not testing. --Ignore the rest if we are not testing.