Compression ratio results are very dependent upon the data used for the tests. Usually, 7-Zip compresses to 7z format 30-70 better than to zip format. And 7-Zip compresses to zip format 2-10 better than most of other zip compatible programs.

7zC.txt
7zFormat.txt
history.txt
LGPL.txt
lzma.txt
Methods.txt
CPL.html
.\7zip\Archive\7z_C\7zAlloc.h
.\....\.......\....\7zBuffer.h
.\....\.......\....\7zCrc.h
.\....\.......\....\7zDecode.h
.\....\.......\....\7zExtract.h
.\....\.......\....\7zHeader.h
.\....\.......\....\7zIn.h
.\....\.......\....\7zItem.h
.\....\.......\....\7zMethodID.h
.\....\.......\....\7zTypes.h
.\Common\Alloc.h
.\7zip\Compress\Branch\ARM.h
.\....\........\......\ARMThumb.h
.\....\........\LZ\BinTree\BinTree.h
.\....\........\..\.......\BinTree2.h
.\....\........\..\.......\BinTree3.h
.\....\........\..\.......\BinTree3Z.h
.\....\........\..\.......\BinTree4.h
.\....\........\..\.......\BinTree4b.h
.\....\........\..\.......\BinTreeMain.h
.\....\........\Branch\BranchARM.h
.\....\........\......\BranchARMThumb.h
.\....\........\......\BranchCoder.h
.\....\........\......\BranchIA64.h
.\....\........\......\BranchPPC.h
.\....\........\......\BranchSPARC.h
.\....\........\......\BranchX86.h
.\Common\C_FileIO.h
.\......\CommandLineParser.h
.\......\ComTry.h
.\......\CRC.h
.\Windows\Defs.h
.\Common\Defs.h
.\Windows\FileIO.h
.\7zip\Common\FileStreams.h
.\....\...press\LZ\HashChain\HC.h
.\....\........\..\.........\HC2.h
.\....\........\..\.........\HC3.h
.\....\........\..\.........\HC4.h
.\....\........\..\.........\HC4b.h
.\....\........\..\.........\HCMain.h
.\....\........\Branch\IA64.h
.\....\ICoder.h
.\....\Compress\LZ\IMatchFinder.h
.\....\...mon\InBuffer.h
.\....\IStream.h
.\....\Compress\LZ\LZInWindow.h
.\....\........\..MA\LZMA.h
.\....\........\...._Alone\LzmaBench.h
.\....\........\.....C\LzmaDecode.h
.\....\........\....\LZMADecoder.h
.\....\........\....\LZMAEncoder.h
.\....\........\...._Alone\LzmaRam.h
.\....\........\..........\LzmaRamDecode.h
.\....\........\.....C\LzmaStateDecode.h
.\....\........\..\LZOutWindow.h
.\Common\MyCom.h
.\......\MyGuidDef.h
.\......\MyInitGuid.h
.\......\MyUnknown.h
.\......\MyWindows.h
.\......\NewHandler.h
.\7zip\Common\OutBuffer.h
.\....\...press\LZ\Patricia\Pat.h
.\....\........\..\........\Pat2.h
.\....\........\..\........\Pat2H.h
.\....\........\..\........\Pat2R.h
.\....\........\..\........\Pat3H.h
.\....\........\..\........\Pat4H.h
.\....\........\..\........\PatMain.h
.\....\........\Branch\PPC.h
.\....\........\RangeCoder\RangeCoder.h
.\....\........\..........\RangeCoderBit.h
.\....\........\..........\RangeCoderBitTree.h
.\....\........\..........\RangeCoderOpt.h
.\....\........\Branch\SPARC.h
.\....\........\RangeCoder\StdAfx.h
.\....\........\LZ\StdAfx.h
.\....\........\Branch\StdAfx.h
.\....\........\LZMA\StdAfx.h
.\....\........\...._Alone\StdAfx.h
.\Common\StdAfx.h
.\Windows\StdAfx.h
.\7zip\Common\StdAfx.h
.\....\......\StreamUtils.h
.\Common\String.h
.\......\StringConvert.h
.\......\StringToInt.h
.\......\Types.h
.\......\Vector.h
.\7zip\Compress\Branch\x86.h
.\....\........\......\x86_2.h
.\....\Archive\7z_C\7zAlloc.c

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