1 HISTORY of the LZMA SDK 2 ----------------------- 3 4 18.06 2018-12-30 5 ------------------------- 6 - The speed for LZMA/LZMA2 compressing was increased by 3-10%, 7 and there are minor changes in compression ratio. 8 - Some bugs were fixed. 9 - The bug in 7-Zip 18.02-18.05 was fixed: 10 There was memory leak in multithreading xz decoder - XzDecMt_Decode(), 11 if xz stream contains only one block. 12 - The changes for MSVS compiler makefiles: 13 - the makefiles now use "PLATFORM" macroname with values (x64, x86, arm64) 14 instead of "CPU" macroname with values (AMD64, ARM64). 15 - the makefiles by default now use static version of the run-time library. 16 17 18 18.05 2018-04-30 19 ------------------------- 20 - The speed for LZMA/LZMA2 compressing was increased 21 by 8% for fastest/fast compression levels and 22 by 3% for normal/maximum compression levels. 23 - Previous versions of 7-Zip could work incorrectly in "Large memory pages" mode in 24 Windows 10 because of some BUG with "Large Pages" in Windows 10. 25 Now 7-Zip doesn't use "Large Pages" on Windows 10 up to revision 1709 (16299). 26 - The BUG was fixed in Lzma2Enc.c 27 Lzma2Enc_Encode2() function worked incorretly, 28 if (inStream == NULL) and the number of block threads is more than 1. 29 30 31 18.03 beta 2018-03-04 32 ------------------------- 33 - Asm\x86\LzmaDecOpt.asm: new optimized LZMA decoder written in asm 34 for x64 with about 30% higher speed than main version of LZMA decoder written in C. 35 - The speed for single-thread LZMA/LZMA2 decoder written in C was increased by 3%. 36 - 7-Zip now can use multi-threading for 7z/LZMA2 decoding, 37 if there are multiple independent data chunks in LZMA2 stream. 38 - 7-Zip now can use multi-threading for xz decoding, 39 if there are multiple blocks in xz stream. 40 41 42 18.01 2019-01-28 43 ------------------------- 44 - The BUG in 17.01 - 18.00 beta was fixed: 45 XzDec.c : random block unpacking and XzUnpacker_IsBlockFinished() 46 didn't work correctly for xz archives without checksum (CRC). 47 48 49 18.00 beta 2019-01-10 50 ------------------------- 51 - The BUG in xz encoder was fixed: 52 There was memory leak of 16 KB for each file compressed with 53 xz compression method, if additional filter was used. 54 55 56 17.01 beta 2017-08-28 57 ------------------------- 58 - Minor speed optimization for LZMA2 (xz and 7z) multi-threading compression. 59 7-Zip now uses additional memory buffers for multi-block LZMA2 compression. 60 CPU utilization was slightly improved. 61 - 7-zip now creates multi-block xz archives by default. Block size can be 62 specified with -ms[Size]{m|g} switch. 63 - xz decoder now can unpack random block from multi-block xz archives. 64 - 7-Zip command line: @listfile now doesn't work after -- switch. 65 Use -i@listfile before -- switch instead. 66 - The BUGs were fixed: 67 7-Zip 17.00 beta crashed for commands that write anti-item to 7z archive. 68 69 70 17.00 beta 2017-04-29 71 ------------------------- 72 - NewHandler.h / NewHandler.cpp: 73 now it redefines operator new() only for old MSVC compilers (_MSC_VER < 1900). 74 - C/7zTypes.h : the names of variables in interface structures were changed (vt). 75 - Some bugs were fixed. 7-Zip could crash in some cases. 76 - Some internal changes in code. 77 78 79 16.04 2016-10-04 80 ------------------------- 81 - The bug was fixed in DllSecur.c. 82 83 84 16.03 2016-09-28 85 ------------------------- 86 - SFX modules now use some protection against DLL preloading attack. 87 - Some bugs in 7z code were fixed. 88 89 90 16.02 2016-05-21 91 ------------------------- 92 - The BUG in 16.00 - 16.01 was fixed: 93 Split Handler (SplitHandler.cpp) returned incorrect 94 total size value (kpidSize) for split archives. 95 96 97 16.01 2016-05-19 98 ------------------------- 99 - Some internal changes to reduce the number of compiler warnings. 100 101 102 16.00 2016-05-10 103 ------------------------- 104 - Some bugs were fixed. 105 106 107 15.12 2015-11-19 108 ------------------------- 109 - The BUG in C version of 7z decoder was fixed: 110 7zDec.c : SzDecodeLzma2() 111 7z decoder could mistakenly report about decoding error for some 7z archives 112 that use LZMA2 compression method. 113 The probability to get that mistaken decoding error report was about 114 one error per 16384 solid blocks for solid blocks larger than 16 KB (compressed size). 115 - The BUG (in 9.26-15.11) in C version of 7z decoder was fixed: 116 7zArcIn.c : SzReadHeader2() 117 7z decoder worked incorrectly for 7z archives that contain 118 empty solid blocks, that can be placed to 7z archive, if some file is 119 unavailable for reading during archive creation. 120 121 122 15.09 beta 2015-10-16 123 ------------------------- 124 - The BUG in LZMA / LZMA2 encoding code was fixed. 125 The BUG in LzFind.c::MatchFinder_ReadBlock() function. 126 If input data size is larger than (4 GiB - dictionary_size), 127 the following code worked incorrectly: 128 - LZMA : LzmaEnc_MemEncode(), LzmaEncode() : LZMA encoding functions 129 for compressing from memory to memory. 130 That BUG is not related to LZMA encoder version that works via streams. 131 - LZMA2 : multi-threaded version of LZMA2 encoder worked incorrectly, if 132 default value of chunk size (CLzma2EncProps::blockSize) is changed 133 to value larger than (4 GiB - dictionary_size). 134 135 136 9.38 beta 2015-01-03 137 ------------------------- 138 - The BUG in 9.31-9.37 was fixed: 139 IArchiveGetRawProps interface was disabled for 7z archives. 140 - The BUG in 9.26-9.36 was fixed: 141 Some code in CPP\7zip\Archive\7z\ worked correctly only under Windows. 142 143 144 9.36 beta 2014-12-26 145 ------------------------- 146 - The BUG in command line version was fixed: 147 7-Zip created temporary archive in current folder during update archive 148 operation, if -w{Path} switch was not specified. 149 The fixed 7-Zip creates temporary archive in folder that contains updated archive. 150 - The BUG in 9.33-9.35 was fixed: 151 7-Zip silently ignored file reading errors during 7z or gz archive creation, 152 and the created archive contained only part of file that was read before error. 153 The fixed 7-Zip stops archive creation and it reports about error. 154 155 156 9.35 beta 2014-12-07 157 ------------------------- 158 - 7zr.exe now support AES encryption. 159 - SFX mudules were added to LZMA SDK 160 - Some bugs were fixed. 161 162 163 9.21 beta 2011-04-11 164 ------------------------- 165 - New class FString for file names at file systems. 166 - Speed optimization in CRC code for big-endian CPUs. 167 - The BUG in Lzma2Dec.c was fixed: 168 Lzma2Decode function didn't work. 169 170 171 9.18 beta 2010-11-02 172 ------------------------- 173 - New small SFX module for installers (SfxSetup). 174 175 176 9.12 beta 2010-03-24 177 ------------------------- 178 - The BUG in LZMA SDK 9.* was fixed: LZMA2 codec didn't work, 179 if more than 10 threads were used (or more than 20 threads in some modes). 180 181 182 9.11 beta 2010-03-15 183 ------------------------- 184 - PPMd compression method support 185 186 187 9.09 2009-12-12 188 ------------------------- 189 - The bug was fixed: 190 Utf16_To_Utf8 funstions in UTFConvert.cpp and 7zMain.c 191 incorrectly converted surrogate characters (the code >= 0x10000) to UTF-8. 192 - Some bugs were fixed 193 194 195 9.06 2009-08-17 196 ------------------------- 197 - Some changes in ANSI-C 7z Decoder interfaces. 198 199 200 9.04 2009-05-30 201 ------------------------- 202 - LZMA2 compression method support 203 - xz format support 204 205 206 4.65 2009-02-03 207 ------------------------- 208 - Some minor fixes 209 210 211 4.63 2008-12-31 212 ------------------------- 213 - Some minor fixes 214 215 216 4.61 beta 2008-11-23 217 ------------------------- 218 - The bug in ANSI-C LZMA Decoder was fixed: 219 If encoded stream was corrupted, decoder could access memory 220 outside of allocated range. 221 - Some changes in ANSI-C 7z Decoder interfaces. 222 - LZMA SDK is placed in the public domain. 223 224 225 4.60 beta 2008-08-19 226 ------------------------- 227 - Some minor fixes. 228 229 230 4.59 beta 2008-08-13 231 ------------------------- 232 - The bug was fixed: 233 LZMA Encoder in fast compression mode could access memory outside of 234 allocated range in some rare cases. 235 236 237 4.58 beta 2008-05-05 238 ------------------------- 239 - ANSI-C LZMA Decoder was rewritten for speed optimizations. 240 - ANSI-C LZMA Encoder was included to LZMA SDK. 241 - C++ LZMA code now is just wrapper over ANSI-C code. 242 243 244 4.57 2007-12-12 245 ------------------------- 246 - Speed optimizations in ++ LZMA Decoder. 247 - Small changes for more compatibility with some C/C++ compilers. 248 249 250 4.49 beta 2007-07-05 251 ------------------------- 252 - .7z ANSI-C Decoder: 253 - now it supports BCJ and BCJ2 filters 254 - now it supports files larger than 4 GB. 255 - now it supports "Last Write Time" field for files. 256 - C++ code for .7z archives compressing/decompressing from 7-zip 257 was included to LZMA SDK. 258 259 260 4.43 2006-06-04 261 ------------------------- 262 - Small changes for more compatibility with some C/C++ compilers. 263 264 265 4.42 2006-05-15 266 ------------------------- 267 - Small changes in .h files in ANSI-C version. 268 269 270 4.39 beta 2006-04-14 271 ------------------------- 272 - The bug in versions 4.33b:4.38b was fixed: 273 C++ version of LZMA encoder could not correctly compress 274 files larger than 2 GB with HC4 match finder (-mfhc4). 275 276 277 4.37 beta 2005-04-06 278 ------------------------- 279 - Fixes in C++ code: code could no be compiled if _NO_EXCEPTIONS was defined. 280 281 282 4.35 beta 2005-03-02 283 ------------------------- 284 - The bug was fixed in C++ version of LZMA Decoder: 285 If encoded stream was corrupted, decoder could access memory 286 outside of allocated range. 287 288 289 4.34 beta 2006-02-27 290 ------------------------- 291 - Compressing speed and memory requirements for compressing were increased 292 - LZMA now can use only these match finders: HC4, BT2, BT3, BT4 293 294 295 4.32 2005-12-09 296 ------------------------- 297 - Java version of LZMA SDK was included 298 299 300 4.30 2005-11-20 301 ------------------------- 302 - Compression ratio was improved in -a2 mode 303 - Speed optimizations for compressing in -a2 mode 304 - -fb switch now supports values up to 273 305 - The bug in 7z_C (7zIn.c) was fixed: 306 It used Alloc/Free functions from different memory pools. 307 So if program used two memory pools, it worked incorrectly. 308 - 7z_C: .7z format supporting was improved 309 - LZMA# SDK (C#.NET version) was included 310 311 312 4.27 (Updated) 2005-09-21 313 ------------------------- 314 - Some GUIDs/interfaces in C++ were changed. 315 IStream.h: 316 ISequentialInStream::Read now works as old ReadPart 317 ISequentialOutStream::Write now works as old WritePart 318 319 320 4.27 2005-08-07 321 ------------------------- 322 - The bug in LzmaDecodeSize.c was fixed: 323 if _LZMA_IN_CB and _LZMA_OUT_READ were defined, 324 decompressing worked incorrectly. 325 326 327 4.26 2005-08-05 328 ------------------------- 329 - Fixes in 7z_C code and LzmaTest.c: 330 previous versions could work incorrectly, 331 if malloc(0) returns 0 332 333 334 4.23 2005-06-29 335 ------------------------- 336 - Small fixes in C++ code 337 338 339 4.22 2005-06-10 340 ------------------------- 341 - Small fixes 342 343 344 4.21 2005-06-08 345 ------------------------- 346 - Interfaces for ANSI-C LZMA Decoder (LzmaDecode.c) were changed 347 - New additional version of ANSI-C LZMA Decoder with zlib-like interface: 348 - LzmaStateDecode.h 349 - LzmaStateDecode.c 350 - LzmaStateTest.c 351 - ANSI-C LZMA Decoder now can decompress files larger than 4 GB 352 353 354 4.17 2005-04-18 355 ------------------------- 356 - New example for RAM->RAM compressing/decompressing: 357 LZMA + BCJ (filter for x86 code): 358 - LzmaRam.h 359 - LzmaRam.cpp 360 - LzmaRamDecode.h 361 - LzmaRamDecode.c 362 - -f86 switch for lzma.exe 363 364 365 4.16 2005-03-29 366 ------------------------- 367 - The bug was fixed in LzmaDecode.c (ANSI-C LZMA Decoder): 368 If _LZMA_OUT_READ was defined, and if encoded stream was corrupted, 369 decoder could access memory outside of allocated range. 370 - Speed optimization of ANSI-C LZMA Decoder (now it's about 20% faster). 371 Old version of LZMA Decoder now is in file LzmaDecodeSize.c. 372 LzmaDecodeSize.c can provide slightly smaller code than LzmaDecode.c 373 - Small speed optimization in LZMA C++ code 374 - filter for SPARC's code was added 375 - Simplified version of .7z ANSI-C Decoder was included 376 377 378 4.06 2004-09-05 379 ------------------------- 380 - The bug in v4.05 was fixed: 381 LZMA-Encoder didn't release output stream in some cases. 382 383 384 4.05 2004-08-25 385 ------------------------- 386 - Source code of filters for x86, IA-64, ARM, ARM-Thumb 387 and PowerPC code was included to SDK 388 - Some internal minor changes 389 390 391 4.04 2004-07-28 392 ------------------------- 393 - More compatibility with some C++ compilers 394 395 396 4.03 2004-06-18 397 ------------------------- 398 - "Benchmark" command was added. It measures compressing 399 and decompressing speed and shows rating values. 400 Also it checks hardware errors. 401 402 403 4.02 2004-06-10 404 ------------------------- 405 - C++ LZMA Encoder/Decoder code now is more portable 406 and it can be compiled by GCC on Linux. 407 408 409 4.01 2004-02-15 410 ------------------------- 411 - Some detection of data corruption was enabled. 412 LzmaDecode.c / RangeDecoderReadByte 413 ..... 414 { 415 rd->ExtraBytes = 1; 416 return 0xFF; 417 } 418 419 420 4.00 2004-02-13 421 ------------------------- 422 - Original version of LZMA SDK 423 424 425 426 HISTORY of the LZMA 427 ------------------- 428 2001-2008: Improvements to LZMA compressing/decompressing code, 429 keeping compatibility with original LZMA format 430 1996-2001: Development of LZMA compression format 431 432 Some milestones: 433 434 2001-08-30: LZMA compression was added to 7-Zip 435 1999-01-02: First version of 7-Zip was released 436 437 438 End of document 439
