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| About site: Software/Data Compression - Zzip |
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| About site: http://debin.net/zzip/ |
Title: Software/Data Compression - Zzip A compression tool under GPL. Zzip compression algorithm is mainly based on the Burrows-Wheeler Transform method developped by Mike Burrows and David Wheeler.
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debin.net :: zzip, a free compression tool under GPL :: homevar fleche_on = new Image(12,33); fleche_on.src = "img/flecheon.gif";var fleche_off = new Image(12,33); fleche_off.src = "img/flecheoff.gif";var flechehomet = "homepage";var flechedownt = "how to download zzip";var flecherest = "some results";var flechelinkt = "some links about compression";window.defaultStatus = "zzip's website";function active(imgName) { if (document.images) { document.images[imgName].src = fleche_on.src; status = eval(imgName+"t"); }}function inactive(imgName) { if (document.images) { document.images[imgName].src = fleche_off.src; }}       This is the home page for Zzip, a new powerful compression tool for Win9x/Me/NT/2000 and Unix, with source code released under the GPL.Zzip, a new compression tool still under development, can compress files with a very high compression ratio. Compared to Winzip 7.0, you can gain, at least, 15 %. Zzip has a lot of useful features (like support for file integrity tests, built-in multimedia detection/compression...).With Zzlib, you can also use Zzip as a library (dll) in one of your program.Source code of Zzip/Zzlib is released under the GNU LGPL.Zzip compression algorithm is mainly based on the Burrows-Wheeler Transform method developped by Mike Burrows and David Wheeler. Here are the different steps : RLE packing if necessary some transformations for text, multimedia and win32 binary files (eol coding, delta-encoding,...) Burrows-Wheeler Transformation, it's a suffix sorting (Bentley-Sedgewick ternary sorting with initial bucket sorting) MTF like transformation arithmetic coding (two groups, ternary sequence & structured model)Current release of Zzip / Zzlib is 0.36c, 04-Jun-2001If you want further information or if you want to report any bug, please mail me at damien at debin dot net. History : 0.36c(04-Jun-01) + bug fixes + unix version doesn't work any more, it will be delayed until I can get access to a unix machine 0.36b(18-Dec-00) + source code is released under the GNU LGPL ! + a new option '-s' to get stats about the (de)compression (only available for x86 cpus) + bug fixes (unix version works !) 0.36a(30-Nov-00) + zzip-sfx, a new utility (only available for Win9x/NT/2000) for building self-extracting archives from zzip archives + a new adaptive block size reduction algorithm (switch -a) + bug fixes + a new web site ;) http://www.zzip.f2s.com/ 0.35g(10-Oct-00) + bug fixes 0.35f(25-Sep-00) + compression and uncompression are somewhat faster (5% I think for regular processors) + a new filter for text files (phrase replacement) has been implemented + better detection of multimedia files + bug fixes 0.35e(21-Aug-00) + compression is 5% faster, uncompression is 20% faster + the three algorithms have been merged into a single, please use now '-mx' to get the best compression ratio + memory footprint has been reduced, the new memory usage is : - 6 times block_size during compression - 5 times block_size during uncompression + the range of block size has been enlarged up to 20*256kb=4Mb (-b20) + a new switch (-mm) enables a new algorithm for image and wav files 0.35d(06-Aug-00) + a lot of functions have been added to the dll to manipulate archives + you can specify now which files you want to extract + Linux and Solaris versions have been updated 0.35c(27-Jul-00) + zzip has been turned into a dll, zzlib, so that you can use zzip as a command line software or as a library in your program + compression/uncompression is slightly faster 0.35b(19-Jul-00) + the compression ratio has improved by about 1%, especially with Win32 exe and text files ; I can now compress the Calgary Corpus within 816,000 bytes and the Canterbury Corpus within 471,000 bytes 0.35a(09-Jun-00) + a major release + some nice commands have been added : deleting files in an archive, adding files (recursively or not) to an existing/new archive, extracting files with full pathname, listing contents of archive, testing archives (command line options have changed !) + some bug fixes (as usual ;) 0.34f(15-May-00) + some important bug fixes + the compression ratio improved by 1% thanks to Szymon Grabowski 0.34e(27-Apr-00) + compression is about 5% faster + some bug fixes 0.34d(14-Apr-00) + (un)compression is about 10% faster + the compression ratio improved slightly (0.5%) + some bugfixes + options -b256,-b512... have been replaced by -b1,-b2... + a new compression mode for multimedia files (-mm) 0.34c(05-Apr-00) + uncompression is 10% faster + the algorithm selection is more efficient and faster 0.34b(02-Apr-00) + Another speed improvement, Zzip 0.34b is 15% faster than 0.34a, but memory usage has increased, so that there is now a new option '-lowmem' which limits memory usage 0.34a(27-Mar-00) + Zzip is now 15% faster + Zzip uses now 40% less memory, 7x block size instead of 10x + bugfixes concerning the archive feature and the i/o error handler 0.33b(24-Mar-00) + some various bug fixes + speed improvements (about 5% faster) 0.33a(17-Mar-00) + multiple-files-in-a-single-archive feature added + CRC32 control for each file of the archive 0.32b,c,d(Feb-00) + bug fix versions + unix platform 0.32(Dec-99) + first quite stable version ©2000-2002 Damien Debin, last update : Jun-2002 home :: blog :: photo blog :: my photo gallery |
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A | compression | tool | under | GPL. | Zzip | compression | algorithm | is | mainly | based | on | the | Burrows-Wheeler | Transform | method | developped | by | Mike | Burrows | and | David | Wheeler. |
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http://debin.net/zzip/
Zzip 2008 October
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A compression tool under GPL. Zzip compression algorithm is mainly based on the Burrows-Wheeler Transform method developped by Mike Burrows and David Wheeler.
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