1 HISTORY of the LZMA SDK
2 -----------------------
5 -------------------------
6 - Encryption strength for 7z archives was increased:
7 the size of random initialization vector was increased from 64-bit to 128-bit,
8 and the pseudo-random number generator was improved.
9 - The bug in 7zIn.c code was fixed.
13 -------------------------
14 - The speed for LZMA/LZMA2 compressing was increased by 3-10%,
15 and there are minor changes in compression ratio.
16 - Some bugs were fixed.
17 - The bug in 7-Zip 18.02-18.05 was fixed:
18 There was memory leak in multithreading xz decoder - XzDecMt_Decode(),
19 if xz stream contains only one block.
20 - The changes for MSVS compiler makefiles:
21 - the makefiles now use "PLATFORM" macroname with values (x64, x86, arm64)
22 instead of "CPU" macroname with values (AMD64, ARM64).
23 - the makefiles by default now use static version of the run-time library.
27 -------------------------
28 - The speed for LZMA/LZMA2 compressing was increased
29 by 8% for fastest/fast compression levels and
30 by 3% for normal/maximum compression levels.
31 - Previous versions of 7-Zip could work incorrectly in "Large memory pages" mode in
32 Windows 10 because of some BUG with "Large Pages" in Windows 10.
33 Now 7-Zip doesn't use "Large Pages" on Windows 10 up to revision 1709 (16299).
34 - The BUG was fixed in Lzma2Enc.c
35 Lzma2Enc_Encode2() function worked incorretly,
36 if (inStream == NULL) and the number of block threads is more than 1.
40 -------------------------
41 - Asm\x86\LzmaDecOpt.asm: new optimized LZMA decoder written in asm
42 for x64 with about 30% higher speed than main version of LZMA decoder written in C.
43 - The speed for single-thread LZMA/LZMA2 decoder written in C was increased by 3%.
44 - 7-Zip now can use multi-threading for 7z/LZMA2 decoding,
45 if there are multiple independent data chunks in LZMA2 stream.
46 - 7-Zip now can use multi-threading for xz decoding,
47 if there are multiple blocks in xz stream.
51 -------------------------
52 - The BUG in 17.01 - 18.00 beta was fixed:
53 XzDec.c : random block unpacking and XzUnpacker_IsBlockFinished()
54 didn't work correctly for xz archives without checksum (CRC).
58 -------------------------
59 - The BUG in xz encoder was fixed:
60 There was memory leak of 16 KB for each file compressed with
61 xz compression method, if additional filter was used.
65 -------------------------
66 - Minor speed optimization for LZMA2 (xz and 7z) multi-threading compression.
67 7-Zip now uses additional memory buffers for multi-block LZMA2 compression.
68 CPU utilization was slightly improved.
69 - 7-zip now creates multi-block xz archives by default. Block size can be
70 specified with -ms[Size]{m|g} switch.
71 - xz decoder now can unpack random block from multi-block xz archives.
72 - 7-Zip command line: @listfile now doesn't work after -- switch.
73 Use -i@listfile before -- switch instead.
74 - The BUGs were fixed:
75 7-Zip 17.00 beta crashed for commands that write anti-item to 7z archive.
79 -------------------------
80 - NewHandler.h / NewHandler.cpp:
81 now it redefines operator new() only for old MSVC compilers (_MSC_VER < 1900).
82 - C/7zTypes.h : the names of variables in interface structures were changed (vt).
83 - Some bugs were fixed. 7-Zip could crash in some cases.
84 - Some internal changes in code.
88 -------------------------
89 - The bug was fixed in DllSecur.c.
93 -------------------------
94 - SFX modules now use some protection against DLL preloading attack.
95 - Some bugs in 7z code were fixed.
99 -------------------------
100 - The BUG in 16.00 - 16.01 was fixed:
101 Split Handler (SplitHandler.cpp) returned incorrect
102 total size value (kpidSize) for split archives.
106 -------------------------
107 - Some internal changes to reduce the number of compiler warnings.
111 -------------------------
112 - Some bugs were fixed.
116 -------------------------
117 - The BUG in C version of 7z decoder was fixed:
118 7zDec.c : SzDecodeLzma2()
119 7z decoder could mistakenly report about decoding error for some 7z archives
120 that use LZMA2 compression method.
121 The probability to get that mistaken decoding error report was about
122 one error per 16384 solid blocks for solid blocks larger than 16 KB (compressed size).
123 - The BUG (in 9.26-15.11) in C version of 7z decoder was fixed:
124 7zArcIn.c : SzReadHeader2()
125 7z decoder worked incorrectly for 7z archives that contain
126 empty solid blocks, that can be placed to 7z archive, if some file is
127 unavailable for reading during archive creation.
130 15.09 beta 2015-10-16
131 -------------------------
132 - The BUG in LZMA / LZMA2 encoding code was fixed.
133 The BUG in LzFind.c::MatchFinder_ReadBlock() function.
134 If input data size is larger than (4 GiB - dictionary_size),
135 the following code worked incorrectly:
136 - LZMA : LzmaEnc_MemEncode(), LzmaEncode() : LZMA encoding functions
137 for compressing from memory to memory.
138 That BUG is not related to LZMA encoder version that works via streams.
139 - LZMA2 : multi-threaded version of LZMA2 encoder worked incorrectly, if
140 default value of chunk size (CLzma2EncProps::blockSize) is changed
141 to value larger than (4 GiB - dictionary_size).
145 -------------------------
146 - The BUG in 9.31-9.37 was fixed:
147 IArchiveGetRawProps interface was disabled for 7z archives.
148 - The BUG in 9.26-9.36 was fixed:
149 Some code in CPP\7zip\Archive\7z\ worked correctly only under Windows.
153 -------------------------
154 - The BUG in command line version was fixed:
155 7-Zip created temporary archive in current folder during update archive
156 operation, if -w{Path} switch was not specified.
157 The fixed 7-Zip creates temporary archive in folder that contains updated archive.
158 - The BUG in 9.33-9.35 was fixed:
159 7-Zip silently ignored file reading errors during 7z or gz archive creation,
160 and the created archive contained only part of file that was read before error.
161 The fixed 7-Zip stops archive creation and it reports about error.
165 -------------------------
166 - 7zr.exe now support AES encryption.
167 - SFX mudules were added to LZMA SDK
168 - Some bugs were fixed.
172 -------------------------
173 - New class FString for file names at file systems.
174 - Speed optimization in CRC code for big-endian CPUs.
175 - The BUG in Lzma2Dec.c was fixed:
176 Lzma2Decode function didn't work.
180 -------------------------
181 - New small SFX module for installers (SfxSetup).
185 -------------------------
186 - The BUG in LZMA SDK 9.* was fixed: LZMA2 codec didn't work,
187 if more than 10 threads were used (or more than 20 threads in some modes).
191 -------------------------
192 - PPMd compression method support
196 -------------------------
198 Utf16_To_Utf8 funstions in UTFConvert.cpp and 7zMain.c
199 incorrectly converted surrogate characters (the code >= 0x10000) to UTF-8.
200 - Some bugs were fixed
204 -------------------------
205 - Some changes in ANSI-C 7z Decoder interfaces.
209 -------------------------
210 - LZMA2 compression method support
215 -------------------------
220 -------------------------
225 -------------------------
226 - The bug in ANSI-C LZMA Decoder was fixed:
227 If encoded stream was corrupted, decoder could access memory
228 outside of allocated range.
229 - Some changes in ANSI-C 7z Decoder interfaces.
230 - LZMA SDK is placed in the public domain.
234 -------------------------
239 -------------------------
241 LZMA Encoder in fast compression mode could access memory outside of
242 allocated range in some rare cases.
246 -------------------------
247 - ANSI-C LZMA Decoder was rewritten for speed optimizations.
248 - ANSI-C LZMA Encoder was included to LZMA SDK.
249 - C++ LZMA code now is just wrapper over ANSI-C code.
253 -------------------------
254 - Speed optimizations in Ñ++ LZMA Decoder.
255 - Small changes for more compatibility with some C/C++ compilers.
259 -------------------------
260 - .7z ANSI-C Decoder:
261 - now it supports BCJ and BCJ2 filters
262 - now it supports files larger than 4 GB.
263 - now it supports "Last Write Time" field for files.
264 - C++ code for .7z archives compressing/decompressing from 7-zip
265 was included to LZMA SDK.
269 -------------------------
270 - Small changes for more compatibility with some C/C++ compilers.
274 -------------------------
275 - Small changes in .h files in ANSI-C version.
279 -------------------------
280 - The bug in versions 4.33b:4.38b was fixed:
281 C++ version of LZMA encoder could not correctly compress
282 files larger than 2 GB with HC4 match finder (-mfhc4).
286 -------------------------
287 - Fixes in C++ code: code could no be compiled if _NO_EXCEPTIONS was defined.
291 -------------------------
292 - The bug was fixed in C++ version of LZMA Decoder:
293 If encoded stream was corrupted, decoder could access memory
294 outside of allocated range.
298 -------------------------
299 - Compressing speed and memory requirements for compressing were increased
300 - LZMA now can use only these match finders: HC4, BT2, BT3, BT4
304 -------------------------
305 - Java version of LZMA SDK was included
309 -------------------------
310 - Compression ratio was improved in -a2 mode
311 - Speed optimizations for compressing in -a2 mode
312 - -fb switch now supports values up to 273
313 - The bug in 7z_C (7zIn.c) was fixed:
314 It used Alloc/Free functions from different memory pools.
315 So if program used two memory pools, it worked incorrectly.
316 - 7z_C: .7z format supporting was improved
317 - LZMA# SDK (C#.NET version) was included
320 4.27 (Updated) 2005-09-21
321 -------------------------
322 - Some GUIDs/interfaces in C++ were changed.
324 ISequentialInStream::Read now works as old ReadPart
325 ISequentialOutStream::Write now works as old WritePart
329 -------------------------
330 - The bug in LzmaDecodeSize.c was fixed:
331 if _LZMA_IN_CB and _LZMA_OUT_READ were defined,
332 decompressing worked incorrectly.
336 -------------------------
337 - Fixes in 7z_C code and LzmaTest.c:
338 previous versions could work incorrectly,
339 if malloc(0) returns 0
343 -------------------------
344 - Small fixes in C++ code
348 -------------------------
353 -------------------------
354 - Interfaces for ANSI-C LZMA Decoder (LzmaDecode.c) were changed
355 - New additional version of ANSI-C LZMA Decoder with zlib-like interface:
359 - ANSI-C LZMA Decoder now can decompress files larger than 4 GB
363 -------------------------
364 - New example for RAM->RAM compressing/decompressing:
365 LZMA + BCJ (filter for x86 code):
370 - -f86 switch for lzma.exe
374 -------------------------
375 - The bug was fixed in LzmaDecode.c (ANSI-C LZMA Decoder):
376 If _LZMA_OUT_READ was defined, and if encoded stream was corrupted,
377 decoder could access memory outside of allocated range.
378 - Speed optimization of ANSI-C LZMA Decoder (now it's about 20% faster).
379 Old version of LZMA Decoder now is in file LzmaDecodeSize.c.
380 LzmaDecodeSize.c can provide slightly smaller code than LzmaDecode.c
381 - Small speed optimization in LZMA C++ code
382 - filter for SPARC's code was added
383 - Simplified version of .7z ANSI-C Decoder was included
387 -------------------------
388 - The bug in v4.05 was fixed:
389 LZMA-Encoder didn't release output stream in some cases.
393 -------------------------
394 - Source code of filters for x86, IA-64, ARM, ARM-Thumb
395 and PowerPC code was included to SDK
396 - Some internal minor changes
400 -------------------------
401 - More compatibility with some C++ compilers
405 -------------------------
406 - "Benchmark" command was added. It measures compressing
407 and decompressing speed and shows rating values.
408 Also it checks hardware errors.
412 -------------------------
413 - C++ LZMA Encoder/Decoder code now is more portable
414 and it can be compiled by GCC on Linux.
418 -------------------------
419 - Some detection of data corruption was enabled.
420 LzmaDecode.c / RangeDecoderReadByte
429 -------------------------
430 - Original version of LZMA SDK
436 2001-2008: Improvements to LZMA compressing/decompressing code,
437 keeping compatibility with original LZMA format
438 1996-2001: Development of LZMA compression format
442 2001-08-30: LZMA compression was added to 7-Zip
443 1999-01-02: First version of 7-Zip was released