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Long Range ZIP 0.23 (Default branch)
Post 302177483 by Linux Bot on Friday 21st of March 2008 08:40:06 AM
03-21-2008
Long Range ZIP 0.23 (Default branch)
LRZIP is a compression program that can achieve very high compression ratios and speed when used with large files. It uses the combined compression algorithms of lzma for maximum compression, lzo for maximum speed, and the long range redundancy reduction of rzip. It is designed to scale with increases with RAM size, improving compression further. A choice of either size or speed optimizations allows for either better compression than even lzma can provide, or better speed than gzip, but with bzip2 sized compression levels. License: GNU General Public License (GPL) Changes:
The LZMA SDK was updated to the latest version, 4.57. Multithreading support for LZMA was added, which nearly doubles speed. A gzip compression option was added. An assembler module for CRC computation was added, but this is dependent on the processor. More enhancements were made to the lzo_compresses function to avoid LZMA errors. File cleanup was done. configure.in was changed to improve compiling. Code cleanup was done. Documentation with benchmarks was improved and expanded. Major bugs were fixed to work on big RAM machines. A major fix was made to prevent copying all data above 4GB uncompressed.
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The LZMA SDK was updated to the latest version, 4.57. Multithreading support for LZMA was added, which nearly doubles speed. A gzip compression option was added. An assembler module for CRC computation was added, but this is dependent on the processor. More enhancements were made to the lzo_compresses function to avoid LZMA errors. File cleanup was done. configure.in was changed to improve compiling. Code cleanup was done. Documentation with benchmarks was improved and expanded. Major bugs were fixed to work on big RAM machines. A major fix was made to prevent copying all data above 4GB uncompressed.
More...
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LEARN ABOUT DEBIAN
lzma_alone
LZMA(1) General Commands Manual LZMA(1) NAME
LZMA - a compression algorithm, based on Lempel Ziv's compression method. SYNOPSIS
lzma <e|d> inputFile outputFile [switches...] DESCRIPTION
LZMA provides high compression ratio and very fast decompression, so it is very suitable for embedded applications. For example, it can be used for ROM (firmware) compression. lzma is the default and general compression method of 7z format in 7-Zip program. FUNCTION LETTERS
e Encode file d Decode file b Benchmark SWITCHES
-a{N} Set compression mode - [0, 1], default: 1 (max) -d{N} Set dictionary - [0,30], default: 23 (8MB) -fb{N} Set number of fast bytes - [5, 273], default: 128 -mc{N} Set number of cycles for match finder -lc{N} Set number of literal context bits - [0, 8], default: 3 -lp{N} Set number of literal pos bits - [0, 4], default: 0 -pb{N} Set number of pos bits - [0, 4], default: 2 -mf{MF_ID} Set Match Finder: [bt2, bt3, bt4, hc4], default: bt4 -eos Write End Of Stream marker -si Read data from stdin -so Write data to stdout SEE ALSO
7z(1),7za(1) AUTHOR
Written for Debian by Mohammed Adnene Trojette. Mohammed Adnene Trojette May 5 2006 LZMA(1)