lib/lzma/lzma.txt

1 LZMA SDK 9.20
4 LZMA SDK provides the documentation, samples, header files, libraries,
5 and tools you need to develop applications that use LZMA compression.
7 LZMA is default and general compression method of 7z format
8 in 7-Zip compression program (www.7-zip.org). LZMA provides high
11 LZMA is an improved version of famous LZ77 compression algorithm.
21 LZMA SDK is written and placed in the public domain by Igor Pavlov.
23 Some code in LZMA SDK is based on public domain code from another developers:
28 LZMA SDK Contents
31 LZMA SDK includes:
33   - ANSI-C/C++/C#/Java source code for LZMA compressing and decompressing
34   - Compiled file->file LZMA compressing/decompressing program for Windows system
39 To compile C++ version of file->file LZMA encoding, go to directory
44 In some UNIX/Linux versions you must compile LZMA with static libraries.
51 lzma.txt     - LZMA SDK description (this file)
55 lzma.exe     - Compiled file->file LZMA encoder/decoder for Windows
57 history.txt  - history of the LZMA SDK
67         LzFind.*   - Match finder for LZ (LZMA) encoders
68         LzFindMt.* - Match finder for LZ (LZMA) encoders for multithreading encoding
70         LzmaDec.*  - LZMA decoding
71         LzmaEnc.*  - LZMA encoding
72         LzmaLib.*  - LZMA Library for DLL calling
76     LzmaLib  - LZMA Library (.DLL for Windows)
78     LzmaUtil - LZMA Utility (file->file LZMA encoder/decoder).
101       Alone7z           - 7zr.exe: Standalone version of 7z.exe that supports only 7z/LZMA/BCJ/BCJ2
102       LzmaCon           - lzma.exe: LZMA compression/decompression
103 …Format7zR         - 7zr.dll: Reduced version of 7za.dll: extracting/compressing to 7z/LZMA/BCJ/BCJ2
104       Format7zExtractR  - 7zxr.dll: Reduced version of 7zxa.dll: extracting from 7z/LZMA/BCJ/BCJ2.
119       LZMA         - LZMA compression/decompression
120       LzmaAlone    - file->file LZMA compression/decompression
127       LZMA         - LZMA compression/decompression
131 C/C++ source code of LZMA SDK is part of 7-Zip project.
138 LZMA features
148 LZMA decoder uses only integer operations and can be
151 Some critical operations that affect the speed of LZMA decompression:
156 The speed of LZMA decompressing mostly depends from CPU speed.
164 Using LZMA encoder/decoder executable
167 Usage:  LZMA <e|d> inputFile outputFile [<switches>...]
174      with LZMA method. Benchmark shows rating in MIPS (million
181        LZMA b 30
193           For decompressing file compressed by LZMA method with dictionary
228   -eos:   write End Of Stream marker. By default LZMA doesn't write
229           eos marker, since LZMA decoder knows uncompressed size
238 1) LZMA e file.bin file.lzma -d16 -lc0
245 2) LZMA e file.bin file.lzma -lc0 -lp2
250 3) LZMA d file.lzma file.bin
261 To increase the compression ratio for LZMA compressing it's desirable
301 LZMA compressed file format
304   0     1   Special LZMA properties (lc,lp, pb in encoded form)
310 ANSI-C LZMA Decoder
313 Please note that interfaces for ANSI-C code were changed in LZMA SDK 4.58.
314 If you want to use old interfaces you can download previous version of LZMA SDK
317 To use ANSI-C LZMA Decoder you need the following files:
322 Memory requirements for LZMA decoding
325 Stack usage of LZMA decoding function for local variables is not
328 LZMA Decoder uses dictionary buffer and internal state structure.
337 LZMA Decoder (ANSI-C version) now supports 2 interfaces:
358   - LZMA Internal Structures: state_size (16 KB for default settings)
369     propData - LZMA properties  (5 bytes)
393   If LZMA decoder sees end_marker before reaching output limit, it returns OK result,
412  - LZMA Internal Structures: state_size (16 KB for default settings)
413  - LZMA dictionary (dictionary size is encoded in LZMA properties header)
415 1) read LZMA properties (5 bytes) and uncompressed size (8 bytes, little-endian) to header:
419 2) Allocate CLzmaDec structures (state + dictionary) using LZMA properties
427 3) Init LzmaDec structure before any new LZMA stream. And call LzmaDec_DecodeToBuf in loop
505 4) Send LZMA properties to LZMA Encoder
526 7) Destroy LZMA Encoder Object
556 _LZMA_SIZE_OPT - Enable some optimizations in LZMA Decoder to get smaller executable code.
569 C++ LZMA Encoder/Decoder
571 C++ LZMA code use COM-like interfaces. So if you want to use it,
573 C++ LZMA code is just wrapper over ANSI-C code.