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HISTORY of the LZMA SDK
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-----------------------
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19.00 2019-02-21
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-------------------------
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- Encryption strength for 7z archives was increased:
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the size of random initialization vector was increased from 64-bit to 128-bit,
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and the pseudo-random number generator was improved.
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- The bug in 7zIn.c code was fixed.
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18.06 2018-12-30
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-------------------------
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- The speed for LZMA/LZMA2 compressing was increased by 3-10%,
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and there are minor changes in compression ratio.
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- Some bugs were fixed.
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- The bug in 7-Zip 18.02-18.05 was fixed:
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There was memory leak in multithreading xz decoder - XzDecMt_Decode(),
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if xz stream contains only one block.
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- The changes for MSVS compiler makefiles:
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- the makefiles now use "PLATFORM" macroname with values (x64, x86, arm64)
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instead of "CPU" macroname with values (AMD64, ARM64).
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- the makefiles by default now use static version of the run-time library.
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18.05 2018-04-30
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-------------------------
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- The speed for LZMA/LZMA2 compressing was increased
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by 8% for fastest/fast compression levels and
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by 3% for normal/maximum compression levels.
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- Previous versions of 7-Zip could work incorrectly in "Large memory pages" mode in
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Windows 10 because of some BUG with "Large Pages" in Windows 10.
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Now 7-Zip doesn't use "Large Pages" on Windows 10 up to revision 1709 (16299).
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- The BUG was fixed in Lzma2Enc.c
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Lzma2Enc_Encode2() function worked incorretly,
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if (inStream == NULL) and the number of block threads is more than 1.
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18.03 beta 2018-03-04
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-------------------------
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- Asm\x86\LzmaDecOpt.asm: new optimized LZMA decoder written in asm
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for x64 with about 30% higher speed than main version of LZMA decoder written in C.
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- The speed for single-thread LZMA/LZMA2 decoder written in C was increased by 3%.
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- 7-Zip now can use multi-threading for 7z/LZMA2 decoding,
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if there are multiple independent data chunks in LZMA2 stream.
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- 7-Zip now can use multi-threading for xz decoding,
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if there are multiple blocks in xz stream.
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18.01 2019-01-28
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-------------------------
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- The BUG in 17.01 - 18.00 beta was fixed:
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XzDec.c : random block unpacking and XzUnpacker_IsBlockFinished()
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didn't work correctly for xz archives without checksum (CRC).
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18.00 beta 2019-01-10
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-------------------------
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- The BUG in xz encoder was fixed:
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There was memory leak of 16 KB for each file compressed with
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xz compression method, if additional filter was used.
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17.01 beta 2017-08-28
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-------------------------
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- Minor speed optimization for LZMA2 (xz and 7z) multi-threading compression.
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7-Zip now uses additional memory buffers for multi-block LZMA2 compression.
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CPU utilization was slightly improved.
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- 7-zip now creates multi-block xz archives by default. Block size can be
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specified with -ms[Size]{m|g} switch.
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- xz decoder now can unpack random block from multi-block xz archives.
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- 7-Zip command line: @listfile now doesn't work after -- switch.
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Use -i@listfile before -- switch instead.
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- The BUGs were fixed:
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7-Zip 17.00 beta crashed for commands that write anti-item to 7z archive.
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17.00 beta 2017-04-29
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-------------------------
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- NewHandler.h / NewHandler.cpp:
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now it redefines operator new() only for old MSVC compilers (_MSC_VER < 1900).
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- C/7zTypes.h : the names of variables in interface structures were changed (vt).
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- Some bugs were fixed. 7-Zip could crash in some cases.
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- Some internal changes in code.
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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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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 <20>++ 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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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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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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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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4.22 2005-06-10
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-------------------------
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- Small fixes
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4.21 2005-06-08
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-------------------------
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- 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
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- ANSI-C LZMA Decoder now can decompress files larger than 4 GB
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4.17 2005-04-18
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-------------------------
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- New example for RAM->RAM compressing/decompressing:
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LZMA + BCJ (filter for x86 code):
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- LzmaRam.h
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- LzmaRam.cpp
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- LzmaRamDecode.h
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- LzmaRamDecode.c
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- -f86 switch for lzma.exe
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4.16 2005-03-29
|
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-------------------------
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- The bug was fixed in LzmaDecode.c (ANSI-C LZMA Decoder):
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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).
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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
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- Simplified version of .7z ANSI-C Decoder was included
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4.06 2004-09-05
|
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|
-------------------------
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|
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- The bug in v4.05 was fixed:
|
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LZMA-Encoder didn't release output stream in some cases.
|
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4.05 2004-08-25
|
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-------------------------
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|
- Source code of filters for x86, IA-64, ARM, ARM-Thumb
|
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and PowerPC code was included to SDK
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- Some internal minor changes
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|
4.04 2004-07-28
|
|
|
-------------------------
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|
|
- More compatibility with some C++ compilers
|
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|
4.03 2004-06-18
|
|
|
-------------------------
|
|
|
- "Benchmark" command was added. It measures compressing
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|
and decompressing speed and shows rating values.
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Also it checks hardware errors.
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|
4.02 2004-06-10
|
|
|
-------------------------
|
|
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- C++ LZMA Encoder/Decoder code now is more portable
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and it can be compiled by GCC on Linux.
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|
4.01 2004-02-15
|
|
|
-------------------------
|
|
|
- Some detection of data corruption was enabled.
|
|
|
LzmaDecode.c / RangeDecoderReadByte
|
|
|
.....
|
|
|
{
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|
rd->ExtraBytes = 1;
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|
return 0xFF;
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}
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|
4.00 2004-02-13
|
|
|
-------------------------
|
|
|
- Original version of LZMA SDK
|
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|
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|
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|
|
|
|
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
|
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|
|
|
Some milestones:
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|
|
2001-08-30: LZMA compression was added to 7-Zip
|
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1999-01-02: First version of 7-Zip was released
|
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End of document
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