mirror of
https://github.com/TangentFoxy/love-pe.git
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73 lines
1.7 KiB
Lua
73 lines
1.7 KiB
Lua
--love-icon-changer library by RamiLego4Game (Rami Sabbagh)
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--[[
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- Usage:
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local iconChanger = require("icon-changer")
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local icodata = iconChanger.extractIcon(exeFile)
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]]
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local bit = require("bit")
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local bor,band,lshift,rshift,tohex = bit.bor,bit.band,bit.lshift,bit.rshift,bit.tohex
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--==Internal Functions==--
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local function decodeNumber(str,bigEndian)
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local num = 0
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if bigEndian then str = str:reverse() end
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for char in string.gmatch(str,".") do
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local byte = string.byte(char)
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num = lshift(num,8)
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num = bor(num, byte)
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end
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return num
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end
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--==User API==--
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local icapi = {}
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function icapi.extractIcon(exeFile)
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--DOS Header
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if exeFile:read(2) ~= "MZ" then return error("This is not an executable file !") end
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exeFile:read(58) --Skip 58 bytes
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local PEHeaderOffset = decodeNumber(exeFile:read(4),true) --Offset to the 'PE\0\0' signature relative to the beginning of the file
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exeFile:seek(PEHeaderOffset) --Seek into the PE Header
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--PE Header
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if exeFile:read(4) ~= "PE\0\0" then return error("Corrupted executable file !") end
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--COFF Header
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exeFile:read(2) --Skip Machine.
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local NumberOfSections = decodeNumber(exeFile:read(2))
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exeFile:read(12) --Skip 3 long values (12 bytes).
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local SizeOfOptionalHeader = decodeNumber(exeFile:read(2))
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exeFile:read(2) --Skip a short value (2 bytes) (Characteristics).
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--PE Optional Header
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local PEOptionalHeaderSignature = decodeNumber(exeFile:read(2))
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local x86, x64 --Executable arch
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if PEOptionalHeaderSignature == 267 then --It's x86
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x86 = true
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elseif PEOptionalHeaderSignature == 523 then --It's x64
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x64 = true
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else
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return error("ROM images are not supported !")
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end
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end
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return icapi |