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EDIT: source code available on Github.
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-2001
If you want further information or if you want to report any bug, please mail
me at damien at debin dot net.
| History : |
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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
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