BaseTools LzmaCompress: Update LZMA to new 16.04 version
New version LZMA SDK improves the compression performance on windows OS, and has no change on the compression ratio. I compress 8M FVMAIN image, the compression time is reduced from 2.590s to 1.419s. Cc: Yonghong Zhu <yonghong.zhu@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Liming Gao <liming.gao@intel.com> Reviewed-by: Yonghong Zhu <yonghong.zhu@intel.com>
This commit is contained in:
363
BaseTools/Source/C/LzmaCompress/Sdk/DOC/lzma-history.txt
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363
BaseTools/Source/C/LzmaCompress/Sdk/DOC/lzma-history.txt
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@ -0,0 +1,363 @@
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HISTORY of the LZMA SDK
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-----------------------
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16.04 2016-10-04
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-------------------------
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- The bug was fixed in DllSecur.c.
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16.03 2016-09-28
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-------------------------
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- SFX modules now use some protection against DLL preloading attack.
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- Some bugs in 7z code were fixed.
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16.02 2016-05-21
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-------------------------
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- The BUG in 16.00 - 16.01 was fixed:
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Split Handler (SplitHandler.cpp) returned incorrect
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total size value (kpidSize) for split archives.
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16.01 2016-05-19
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-------------------------
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- Some internal changes to reduce the number of compiler warnings.
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16.00 2016-05-10
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-------------------------
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- Some bugs were fixed.
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15.12 2015-11-19
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-------------------------
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- The BUG in C version of 7z decoder was fixed:
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7zDec.c : SzDecodeLzma2()
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7z decoder could mistakenly report about decoding error for some 7z archives
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that use LZMA2 compression method.
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The probability to get that mistaken decoding error report was about
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one error per 16384 solid blocks for solid blocks larger than 16 KB (compressed size).
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- The BUG (in 9.26-15.11) in C version of 7z decoder was fixed:
|
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7zArcIn.c : SzReadHeader2()
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7z decoder worked incorrectly for 7z archives that contain
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empty solid blocks, that can be placed to 7z archive, if some file is
|
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unavailable for reading during archive creation.
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15.09 beta 2015-10-16
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-------------------------
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- The BUG in LZMA / LZMA2 encoding code was fixed.
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The BUG in LzFind.c::MatchFinder_ReadBlock() function.
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If input data size is larger than (4 GiB - dictionary_size),
|
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the following code worked incorrectly:
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- LZMA : LzmaEnc_MemEncode(), LzmaEncode() : LZMA encoding functions
|
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for compressing from memory to memory.
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That BUG is not related to LZMA encoder version that works via streams.
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- LZMA2 : multi-threaded version of LZMA2 encoder worked incorrectly, if
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default value of chunk size (CLzma2EncProps::blockSize) is changed
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to value larger than (4 GiB - dictionary_size).
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9.38 beta 2015-01-03
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-------------------------
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- The BUG in 9.31-9.37 was fixed:
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IArchiveGetRawProps interface was disabled for 7z archives.
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- The BUG in 9.26-9.36 was fixed:
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Some code in CPP\7zip\Archive\7z\ worked correctly only under Windows.
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9.36 beta 2014-12-26
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-------------------------
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- The BUG in command line version was fixed:
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7-Zip created temporary archive in current folder during update archive
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operation, if -w{Path} switch was not specified.
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The fixed 7-Zip creates temporary archive in folder that contains updated archive.
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- The BUG in 9.33-9.35 was fixed:
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7-Zip silently ignored file reading errors during 7z or gz archive creation,
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and the created archive contained only part of file that was read before error.
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The fixed 7-Zip stops archive creation and it reports about error.
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9.35 beta 2014-12-07
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-------------------------
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- 7zr.exe now support AES encryption.
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- SFX mudules were added to LZMA SDK
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- Some bugs were fixed.
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9.21 beta 2011-04-11
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-------------------------
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- New class FString for file names at file systems.
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- Speed optimization in CRC code for big-endian CPUs.
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- The BUG in Lzma2Dec.c was fixed:
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Lzma2Decode function didn't work.
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9.18 beta 2010-11-02
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-------------------------
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- New small SFX module for installers (SfxSetup).
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9.12 beta 2010-03-24
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-------------------------
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- The BUG in LZMA SDK 9.* was fixed: LZMA2 codec didn't work,
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if more than 10 threads were used (or more than 20 threads in some modes).
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9.11 beta 2010-03-15
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-------------------------
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- PPMd compression method support
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9.09 2009-12-12
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-------------------------
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- The bug was fixed:
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Utf16_To_Utf8 funstions in UTFConvert.cpp and 7zMain.c
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incorrectly converted surrogate characters (the code >= 0x10000) to UTF-8.
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- Some bugs were fixed
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|
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9.06 2009-08-17
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-------------------------
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- Some changes in ANSI-C 7z Decoder interfaces.
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9.04 2009-05-30
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-------------------------
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- LZMA2 compression method support
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- xz format support
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4.65 2009-02-03
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-------------------------
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- Some minor fixes
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4.63 2008-12-31
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-------------------------
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- Some minor fixes
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4.61 beta 2008-11-23
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-------------------------
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- The bug in ANSI-C LZMA Decoder was fixed:
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If encoded stream was corrupted, decoder could access memory
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outside of allocated range.
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- Some changes in ANSI-C 7z Decoder interfaces.
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- LZMA SDK is placed in the public domain.
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4.60 beta 2008-08-19
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-------------------------
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- Some minor fixes.
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4.59 beta 2008-08-13
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-------------------------
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- The bug was fixed:
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LZMA Encoder in fast compression mode could access memory outside of
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allocated range in some rare cases.
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4.58 beta 2008-05-05
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-------------------------
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- ANSI-C LZMA Decoder was rewritten for speed optimizations.
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- ANSI-C LZMA Encoder was included to LZMA SDK.
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- C++ LZMA code now is just wrapper over ANSI-C code.
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4.57 2007-12-12
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-------------------------
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- Speed optimizations in C++ LZMA Decoder.
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- Small changes for more compatibility with some C/C++ compilers.
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4.49 beta 2007-07-05
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-------------------------
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- .7z ANSI-C Decoder:
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- now it supports BCJ and BCJ2 filters
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- now it supports files larger than 4 GB.
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- now it supports "Last Write Time" field for files.
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- C++ code for .7z archives compressing/decompressing from 7-zip
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was included to LZMA SDK.
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4.43 2006-06-04
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-------------------------
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- Small changes for more compatibility with some C/C++ compilers.
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4.42 2006-05-15
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-------------------------
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- Small changes in .h files in ANSI-C version.
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4.39 beta 2006-04-14
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-------------------------
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- The bug in versions 4.33b:4.38b was fixed:
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C++ version of LZMA encoder could not correctly compress
|
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files larger than 2 GB with HC4 match finder (-mfhc4).
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4.37 beta 2005-04-06
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-------------------------
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- Fixes in C++ code: code could no be compiled if _NO_EXCEPTIONS was defined.
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||||
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4.35 beta 2005-03-02
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-------------------------
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- The bug was fixed in C++ version of LZMA Decoder:
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If encoded stream was corrupted, decoder could access memory
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outside of allocated range.
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4.34 beta 2006-02-27
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-------------------------
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- Compressing speed and memory requirements for compressing were increased
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- LZMA now can use only these match finders: HC4, BT2, BT3, BT4
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4.32 2005-12-09
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-------------------------
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- Java version of LZMA SDK was included
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4.30 2005-11-20
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-------------------------
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- Compression ratio was improved in -a2 mode
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- Speed optimizations for compressing in -a2 mode
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- -fb switch now supports values up to 273
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- The bug in 7z_C (7zIn.c) was fixed:
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It used Alloc/Free functions from different memory pools.
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So if program used two memory pools, it worked incorrectly.
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- 7z_C: .7z format supporting was improved
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- LZMA# SDK (C#.NET version) was included
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4.27 (Updated) 2005-09-21
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-------------------------
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- Some GUIDs/interfaces in C++ were changed.
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IStream.h:
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ISequentialInStream::Read now works as old ReadPart
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ISequentialOutStream::Write now works as old WritePart
|
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|
||||
|
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4.27 2005-08-07
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-------------------------
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- The bug in LzmaDecodeSize.c was fixed:
|
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if _LZMA_IN_CB and _LZMA_OUT_READ were defined,
|
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decompressing worked incorrectly.
|
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|
||||
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4.26 2005-08-05
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-------------------------
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- Fixes in 7z_C code and LzmaTest.c:
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previous versions could work incorrectly,
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if malloc(0) returns 0
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4.23 2005-06-29
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-------------------------
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- Small fixes in C++ code
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||||
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4.22 2005-06-10
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-------------------------
|
||||
- Small fixes
|
||||
|
||||
|
||||
4.21 2005-06-08
|
||||
-------------------------
|
||||
- Interfaces for ANSI-C LZMA Decoder (LzmaDecode.c) were changed
|
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- New additional version of ANSI-C LZMA Decoder with zlib-like interface:
|
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- LzmaStateDecode.h
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||||
- LzmaStateDecode.c
|
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- LzmaStateTest.c
|
||||
- ANSI-C LZMA Decoder now can decompress files larger than 4 GB
|
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|
||||
|
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4.17 2005-04-18
|
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-------------------------
|
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- New example for RAM->RAM compressing/decompressing:
|
||||
LZMA + BCJ (filter for x86 code):
|
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- LzmaRam.h
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||||
- LzmaRam.cpp
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||||
- LzmaRamDecode.h
|
||||
- LzmaRamDecode.c
|
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- -f86 switch for lzma.exe
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||||
|
||||
|
||||
4.16 2005-03-29
|
||||
-------------------------
|
||||
- The bug was fixed in LzmaDecode.c (ANSI-C LZMA Decoder):
|
||||
If _LZMA_OUT_READ was defined, and if encoded stream was corrupted,
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decoder could access memory outside of allocated range.
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||||
- Speed optimization of ANSI-C LZMA Decoder (now it's about 20% faster).
|
||||
Old version of LZMA Decoder now is in file LzmaDecodeSize.c.
|
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LzmaDecodeSize.c can provide slightly smaller code than LzmaDecode.c
|
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- Small speed optimization in LZMA C++ code
|
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- filter for SPARC's code was added
|
||||
- Simplified version of .7z ANSI-C Decoder was included
|
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|
||||
|
||||
4.06 2004-09-05
|
||||
-------------------------
|
||||
- The bug in v4.05 was fixed:
|
||||
LZMA-Encoder didn't release output stream in some cases.
|
||||
|
||||
|
||||
4.05 2004-08-25
|
||||
-------------------------
|
||||
- Source code of filters for x86, IA-64, ARM, ARM-Thumb
|
||||
and PowerPC code was included to SDK
|
||||
- Some internal minor changes
|
||||
|
||||
|
||||
4.04 2004-07-28
|
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-------------------------
|
||||
- More compatibility with some C++ compilers
|
||||
|
||||
|
||||
4.03 2004-06-18
|
||||
-------------------------
|
||||
- "Benchmark" command was added. It measures compressing
|
||||
and decompressing speed and shows rating values.
|
||||
Also it checks hardware errors.
|
||||
|
||||
|
||||
4.02 2004-06-10
|
||||
-------------------------
|
||||
- C++ LZMA Encoder/Decoder code now is more portable
|
||||
and it can be compiled by GCC on Linux.
|
||||
|
||||
|
||||
4.01 2004-02-15
|
||||
-------------------------
|
||||
- Some detection of data corruption was enabled.
|
||||
LzmaDecode.c / RangeDecoderReadByte
|
||||
.....
|
||||
{
|
||||
rd->ExtraBytes = 1;
|
||||
return 0xFF;
|
||||
}
|
||||
|
||||
|
||||
4.00 2004-02-13
|
||||
-------------------------
|
||||
- Original version of LZMA SDK
|
||||
|
||||
|
||||
|
||||
HISTORY of the LZMA
|
||||
-------------------
|
||||
2001-2008: Improvements to LZMA compressing/decompressing code,
|
||||
keeping compatibility with original LZMA format
|
||||
1996-2001: Development of LZMA compression format
|
||||
|
||||
Some milestones:
|
||||
|
||||
2001-08-30: LZMA compression was added to 7-Zip
|
||||
1999-01-02: First version of 7-Zip was released
|
||||
|
||||
|
||||
End of document
|
357
BaseTools/Source/C/LzmaCompress/Sdk/DOC/lzma-sdk.txt
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BaseTools/Source/C/LzmaCompress/Sdk/DOC/lzma-sdk.txt
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@ -0,0 +1,357 @@
|
||||
LZMA SDK 16.04
|
||||
--------------
|
||||
|
||||
LZMA SDK provides the documentation, samples, header files,
|
||||
libraries, and tools you need to develop applications that
|
||||
use 7z / LZMA / LZMA2 / XZ compression.
|
||||
|
||||
LZMA is an improved version of famous LZ77 compression algorithm.
|
||||
It was improved in way of maximum increasing of compression ratio,
|
||||
keeping high decompression speed and low memory requirements for
|
||||
decompressing.
|
||||
|
||||
LZMA2 is a LZMA based compression method. LZMA2 provides better
|
||||
multithreading support for compression than LZMA and some other improvements.
|
||||
|
||||
7z is a file format for data compression and file archiving.
|
||||
7z is a main file format for 7-Zip compression program (www.7-zip.org).
|
||||
7z format supports different compression methods: LZMA, LZMA2 and others.
|
||||
7z also supports AES-256 based encryption.
|
||||
|
||||
XZ is a file format for data compression that uses LZMA2 compression.
|
||||
XZ format provides additional features: SHA/CRC check, filters for
|
||||
improved compression ratio, splitting to blocks and streams,
|
||||
|
||||
|
||||
|
||||
LICENSE
|
||||
-------
|
||||
|
||||
LZMA SDK is written and placed in the public domain by Igor Pavlov.
|
||||
|
||||
Some code in LZMA SDK is based on public domain code from another developers:
|
||||
1) PPMd var.H (2001): Dmitry Shkarin
|
||||
2) SHA-256: Wei Dai (Crypto++ library)
|
||||
|
||||
Anyone is free to copy, modify, publish, use, compile, sell, or distribute the
|
||||
original LZMA SDK code, either in source code form or as a compiled binary, for
|
||||
any purpose, commercial or non-commercial, and by any means.
|
||||
|
||||
LZMA SDK code is compatible with open source licenses, for example, you can
|
||||
include it to GNU GPL or GNU LGPL code.
|
||||
|
||||
|
||||
LZMA SDK Contents
|
||||
-----------------
|
||||
|
||||
Source code:
|
||||
|
||||
- C / C++ / C# / Java - LZMA compression and decompression
|
||||
- C / C++ - LZMA2 compression and decompression
|
||||
- C / C++ - XZ compression and decompression
|
||||
- C - 7z decompression
|
||||
- C++ - 7z compression and decompression
|
||||
- C - small SFXs for installers (7z decompression)
|
||||
- C++ - SFXs and SFXs for installers (7z decompression)
|
||||
|
||||
Precomiled binaries:
|
||||
|
||||
- console programs for lzma / 7z / xz compression and decompression
|
||||
- SFX modules for installers.
|
||||
|
||||
|
||||
UNIX/Linux version
|
||||
------------------
|
||||
To compile C++ version of file->file LZMA encoding, go to directory
|
||||
CPP/7zip/Bundles/LzmaCon
|
||||
and call make to recompile it:
|
||||
make -f makefile.gcc clean all
|
||||
|
||||
In some UNIX/Linux versions you must compile LZMA with static libraries.
|
||||
To compile with static libraries, you can use
|
||||
LIB = -lm -static
|
||||
|
||||
Also you can use p7zip (port of 7-Zip for POSIX systems like Unix or Linux):
|
||||
|
||||
http://p7zip.sourceforge.net/
|
||||
|
||||
|
||||
Files
|
||||
-----
|
||||
|
||||
DOC/7zC.txt - 7z ANSI-C Decoder description
|
||||
DOC/7zFormat.txt - 7z Format description
|
||||
DOC/installer.txt - information about 7-Zip for installers
|
||||
DOC/lzma.txt - LZMA compression description
|
||||
DOC/lzma-sdk.txt - LZMA SDK description (this file)
|
||||
DOC/lzma-history.txt - history of LZMA SDK
|
||||
DOC/lzma-specification.txt - Specification of LZMA
|
||||
DOC/Methods.txt - Compression method IDs for .7z
|
||||
|
||||
bin/installer/ - example script to create installer that uses SFX module,
|
||||
|
||||
bin/7zdec.exe - simplified 7z archive decoder
|
||||
bin/7zr.exe - 7-Zip console program (reduced version)
|
||||
bin/x64/7zr.exe - 7-Zip console program (reduced version) (x64 version)
|
||||
bin/lzma.exe - file->file LZMA encoder/decoder for Windows
|
||||
bin/7zS2.sfx - small SFX module for installers (GUI version)
|
||||
bin/7zS2con.sfx - small SFX module for installers (Console version)
|
||||
bin/7zSD.sfx - SFX module for installers.
|
||||
|
||||
|
||||
7zDec.exe
|
||||
---------
|
||||
7zDec.exe is simplified 7z archive decoder.
|
||||
It supports only LZMA, LZMA2, and PPMd methods.
|
||||
7zDec decodes whole solid block from 7z archive to RAM.
|
||||
The RAM consumption can be high.
|
||||
|
||||
|
||||
|
||||
|
||||
Source code structure
|
||||
---------------------
|
||||
|
||||
|
||||
Asm/ - asm files (optimized code for CRC calculation and Intel-AES encryption)
|
||||
|
||||
C/ - C files (compression / decompression and other)
|
||||
Util/
|
||||
7z - 7z decoder program (decoding 7z files)
|
||||
Lzma - LZMA program (file->file LZMA encoder/decoder).
|
||||
LzmaLib - LZMA library (.DLL for Windows)
|
||||
SfxSetup - small SFX module for installers
|
||||
|
||||
CPP/ -- CPP files
|
||||
|
||||
Common - common files for C++ projects
|
||||
Windows - common files for Windows related code
|
||||
|
||||
7zip - files related to 7-Zip
|
||||
|
||||
Archive - files related to archiving
|
||||
|
||||
Common - common files for archive handling
|
||||
7z - 7z C++ Encoder/Decoder
|
||||
|
||||
Bundles - Modules that are bundles of other modules (files)
|
||||
|
||||
Alone7z - 7zr.exe: Standalone 7-Zip console program (reduced version)
|
||||
Format7zExtractR - 7zxr.dll: Reduced version of 7z DLL: extracting from 7z/LZMA/BCJ/BCJ2.
|
||||
Format7zR - 7zr.dll: Reduced version of 7z DLL: extracting/compressing to 7z/LZMA/BCJ/BCJ2
|
||||
LzmaCon - lzma.exe: LZMA compression/decompression
|
||||
LzmaSpec - example code for LZMA Specification
|
||||
SFXCon - 7zCon.sfx: Console 7z SFX module
|
||||
SFXSetup - 7zS.sfx: 7z SFX module for installers
|
||||
SFXWin - 7z.sfx: GUI 7z SFX module
|
||||
|
||||
Common - common files for 7-Zip
|
||||
|
||||
Compress - files for compression/decompression
|
||||
|
||||
Crypto - files for encryption / decompression
|
||||
|
||||
UI - User Interface files
|
||||
|
||||
Client7z - Test application for 7za.dll, 7zr.dll, 7zxr.dll
|
||||
Common - Common UI files
|
||||
Console - Code for console program (7z.exe)
|
||||
Explorer - Some code from 7-Zip Shell extension
|
||||
FileManager - Some GUI code from 7-Zip File Manager
|
||||
GUI - Some GUI code from 7-Zip
|
||||
|
||||
|
||||
CS/ - C# files
|
||||
7zip
|
||||
Common - some common files for 7-Zip
|
||||
Compress - files related to compression/decompression
|
||||
LZ - files related to LZ (Lempel-Ziv) compression algorithm
|
||||
LZMA - LZMA compression/decompression
|
||||
LzmaAlone - file->file LZMA compression/decompression
|
||||
RangeCoder - Range Coder (special code of compression/decompression)
|
||||
|
||||
Java/ - Java files
|
||||
SevenZip
|
||||
Compression - files related to compression/decompression
|
||||
LZ - files related to LZ (Lempel-Ziv) compression algorithm
|
||||
LZMA - LZMA compression/decompression
|
||||
RangeCoder - Range Coder (special code of compression/decompression)
|
||||
|
||||
|
||||
Note:
|
||||
Asm / C / C++ source code of LZMA SDK is part of 7-Zip's source code.
|
||||
7-Zip's source code can be downloaded from 7-Zip's SourceForge page:
|
||||
|
||||
http://sourceforge.net/projects/sevenzip/
|
||||
|
||||
|
||||
|
||||
LZMA features
|
||||
-------------
|
||||
- Variable dictionary size (up to 1 GB)
|
||||
- Estimated compressing speed: about 2 MB/s on 2 GHz CPU
|
||||
- Estimated decompressing speed:
|
||||
- 20-30 MB/s on modern 2 GHz cpu
|
||||
- 1-2 MB/s on 200 MHz simple RISC cpu: (ARM, MIPS, PowerPC)
|
||||
- Small memory requirements for decompressing (16 KB + DictionarySize)
|
||||
- Small code size for decompressing: 5-8 KB
|
||||
|
||||
LZMA decoder uses only integer operations and can be
|
||||
implemented in any modern 32-bit CPU (or on 16-bit CPU with some conditions).
|
||||
|
||||
Some critical operations that affect the speed of LZMA decompression:
|
||||
1) 32*16 bit integer multiply
|
||||
2) Mispredicted branches (penalty mostly depends from pipeline length)
|
||||
3) 32-bit shift and arithmetic operations
|
||||
|
||||
The speed of LZMA decompressing mostly depends from CPU speed.
|
||||
Memory speed has no big meaning. But if your CPU has small data cache,
|
||||
overall weight of memory speed will slightly increase.
|
||||
|
||||
|
||||
How To Use
|
||||
----------
|
||||
|
||||
Using LZMA encoder/decoder executable
|
||||
--------------------------------------
|
||||
|
||||
Usage: LZMA <e|d> inputFile outputFile [<switches>...]
|
||||
|
||||
e: encode file
|
||||
|
||||
d: decode file
|
||||
|
||||
b: Benchmark. There are two tests: compressing and decompressing
|
||||
with LZMA method. Benchmark shows rating in MIPS (million
|
||||
instructions per second). Rating value is calculated from
|
||||
measured speed and it is normalized with Intel's Core 2 results.
|
||||
Also Benchmark checks possible hardware errors (RAM
|
||||
errors in most cases). Benchmark uses these settings:
|
||||
(-a1, -d21, -fb32, -mfbt4). You can change only -d parameter.
|
||||
Also you can change the number of iterations. Example for 30 iterations:
|
||||
LZMA b 30
|
||||
Default number of iterations is 10.
|
||||
|
||||
<Switches>
|
||||
|
||||
|
||||
-a{N}: set compression mode 0 = fast, 1 = normal
|
||||
default: 1 (normal)
|
||||
|
||||
d{N}: Sets Dictionary size - [0, 30], default: 23 (8MB)
|
||||
The maximum value for dictionary size is 1 GB = 2^30 bytes.
|
||||
Dictionary size is calculated as DictionarySize = 2^N bytes.
|
||||
For decompressing file compressed by LZMA method with dictionary
|
||||
size D = 2^N you need about D bytes of memory (RAM).
|
||||
|
||||
-fb{N}: set number of fast bytes - [5, 273], default: 128
|
||||
Usually big number gives a little bit better compression ratio
|
||||
and slower compression process.
|
||||
|
||||
-lc{N}: set number of literal context bits - [0, 8], default: 3
|
||||
Sometimes lc=4 gives gain for big files.
|
||||
|
||||
-lp{N}: set number of literal pos bits - [0, 4], default: 0
|
||||
lp switch is intended for periodical data when period is
|
||||
equal 2^N. For example, for 32-bit (4 bytes)
|
||||
periodical data you can use lp=2. Often it's better to set lc0,
|
||||
if you change lp switch.
|
||||
|
||||
-pb{N}: set number of pos bits - [0, 4], default: 2
|
||||
pb switch is intended for periodical data
|
||||
when period is equal 2^N.
|
||||
|
||||
-mf{MF_ID}: set Match Finder. Default: bt4.
|
||||
Algorithms from hc* group doesn't provide good compression
|
||||
ratio, but they often works pretty fast in combination with
|
||||
fast mode (-a0).
|
||||
|
||||
Memory requirements depend from dictionary size
|
||||
(parameter "d" in table below).
|
||||
|
||||
MF_ID Memory Description
|
||||
|
||||
bt2 d * 9.5 + 4MB Binary Tree with 2 bytes hashing.
|
||||
bt3 d * 11.5 + 4MB Binary Tree with 3 bytes hashing.
|
||||
bt4 d * 11.5 + 4MB Binary Tree with 4 bytes hashing.
|
||||
hc4 d * 7.5 + 4MB Hash Chain with 4 bytes hashing.
|
||||
|
||||
-eos: write End Of Stream marker. By default LZMA doesn't write
|
||||
eos marker, since LZMA decoder knows uncompressed size
|
||||
stored in .lzma file header.
|
||||
|
||||
-si: Read data from stdin (it will write End Of Stream marker).
|
||||
-so: Write data to stdout
|
||||
|
||||
|
||||
Examples:
|
||||
|
||||
1) LZMA e file.bin file.lzma -d16 -lc0
|
||||
|
||||
compresses file.bin to file.lzma with 64 KB dictionary (2^16=64K)
|
||||
and 0 literal context bits. -lc0 allows to reduce memory requirements
|
||||
for decompression.
|
||||
|
||||
|
||||
2) LZMA e file.bin file.lzma -lc0 -lp2
|
||||
|
||||
compresses file.bin to file.lzma with settings suitable
|
||||
for 32-bit periodical data (for example, ARM or MIPS code).
|
||||
|
||||
3) LZMA d file.lzma file.bin
|
||||
|
||||
decompresses file.lzma to file.bin.
|
||||
|
||||
|
||||
Compression ratio hints
|
||||
-----------------------
|
||||
|
||||
Recommendations
|
||||
---------------
|
||||
|
||||
To increase the compression ratio for LZMA compressing it's desirable
|
||||
to have aligned data (if it's possible) and also it's desirable to locate
|
||||
data in such order, where code is grouped in one place and data is
|
||||
grouped in other place (it's better than such mixing: code, data, code,
|
||||
data, ...).
|
||||
|
||||
|
||||
Filters
|
||||
-------
|
||||
You can increase the compression ratio for some data types, using
|
||||
special filters before compressing. For example, it's possible to
|
||||
increase the compression ratio on 5-10% for code for those CPU ISAs:
|
||||
x86, IA-64, ARM, ARM-Thumb, PowerPC, SPARC.
|
||||
|
||||
You can find C source code of such filters in C/Bra*.* files
|
||||
|
||||
You can check the compression ratio gain of these filters with such
|
||||
7-Zip commands (example for ARM code):
|
||||
No filter:
|
||||
7z a a1.7z a.bin -m0=lzma
|
||||
|
||||
With filter for little-endian ARM code:
|
||||
7z a a2.7z a.bin -m0=arm -m1=lzma
|
||||
|
||||
It works in such manner:
|
||||
Compressing = Filter_encoding + LZMA_encoding
|
||||
Decompressing = LZMA_decoding + Filter_decoding
|
||||
|
||||
Compressing and decompressing speed of such filters is very high,
|
||||
so it will not increase decompressing time too much.
|
||||
Moreover, it reduces decompression time for LZMA_decoding,
|
||||
since compression ratio with filtering is higher.
|
||||
|
||||
These filters convert CALL (calling procedure) instructions
|
||||
from relative offsets to absolute addresses, so such data becomes more
|
||||
compressible.
|
||||
|
||||
For some ISAs (for example, for MIPS) it's impossible to get gain from such filter.
|
||||
|
||||
|
||||
|
||||
---
|
||||
|
||||
http://www.7-zip.org
|
||||
http://www.7-zip.org/sdk.html
|
||||
http://www.7-zip.org/support.html
|
Reference in New Issue
Block a user