Data-Compression.org

data compression link collection

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Estimating entropy rates with Bayesian confidence intervals

I’m pleased to announce with my co-authors availability of a preprint on our new algorithm to estimate the Shannon entropy rate (bits/symbol) or (bits/sec) of an observed sequence of low-alphabet symbols. It uses the Context-Tree-Weighting universal compression method, but doesnot use the compression ratio directly as an entropy estimator but as a scaffold for a […]

ftp://lyapunov.ucsd.edu/pub/nonlinear/bayesian_information/Kennel_Shlens_et_al_2004.pdf

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Posted in July 10th, 2004

ImageMagick

ImageMagick is a robust collection of tools and libraries offered under a free license to read, write, and manipulate an image in many image formats (over 87 major formats) including popular formats like TIFF, JPEG, PNG, PDF, PhotoCD, and GIF. Programming interfaces are provided for C/C++, Java, Perl, VB, and more.

Version 6.0.3 is shipping in […]

http://www.imagemagick.org/

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Posted in July 10th, 2004

UPX - the Ultimate Packer for eXecutables

Markus F.X.J. Oberhumer & László Molnár have created an executable packer that works on DOS, Linux, and Windows executables.
A DCL user had this to say: UPX is just excellent - and it’s free.

UPX 1.25 is shipping as of June, 2004.

http://upx.sourceforge.net/

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Posted in July 4th, 2004

Zipdiff

Use the zipdiff tool when you need to compare the contents of two zip files. It is equally suited for comparing jar files, EAR files, WAR files or RAR files. Run it standalone or as an Ant task. The tool supports three output formats: plain text, XML, and HTML. zipdiff is written in Java.

Release […]

http://zipdiff.sourceforge.net/

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Posted in July 4th, 2004

The Heirloom Toolchest

The Heirloom Toolchest includes Open Source cpio and tar implementations running on Linux, Solaris, and Open UNIX. cpio is able to read and write all known Unix cpio archive formats, including proprietary ones, and zip files, including support for the zip64 format.

The most recent update of the project was on June 30, 2004.

http://heirloom.sourceforge.net/

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Posted in July 4th, 2004

p7zip

p7zip is a quick port of 7za.exe (command line version of 7zip, see www.7-zip.org) for Unix. 7-Zip is a file archiver with highest compression ratio.

Version 0.81 is shipping as of July, 2004.

http://sourceforge.net/projects/p7zip/

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Posted in July 4th, 2004

Demasoni

Demasoni is working on a revolutionary new data compression method, using something called the Starr Transform.

http://www.demasoni.com/

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Posted in July 4th, 2004

Remote Sessions with NX

NxServLiv allow compressed remote X sessions using NoMachine’s NX oss libraries. Like ssh terminal but graphical. Work from Modem to Lan with different compression ratios

http://sourceforge.net/projects/nxservliv/

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Posted in July 4th, 2004

MP3 Streaming DownSampler for PHP

The MP3 Streaming DownSampler for PHP is written with cable modem/DSL users with low upstream caps in mind. Using LAME, it dynamically downsamples a requested MP3 to a bitrate which can be streamed. It doesn’t use temporary files, so you don’t have to take the time to do any batching, and you just give it […]

http://freshmeat.net/projects/mp3sds

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Posted in July 4th, 2004

VideoNet

A video conferencing project for Windows PCs using an H.263 video codec.

http://codeproject.com/internet/videonet.asp

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Posted in July 4th, 2004

Jspeex

This project is an attempt to port the free Speex voice codec to a pure Java implementation.

Version 0.9.4 is shipping as of June, 2004.

http://sourceforge.net/projects/jspeex/

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Posted in June 27th, 2004

DevIL - A full featured cross-platform image library

DevIL provides the code needed to load a wide variety of images into your program. A nice long list of images that can be loaded are listed here, and a smaller but still quite nice list of formats that can be written to. Displaying images is currently supported under OpenGL, Windows GDI, SDL, DirectX, and […]

http://openil.sourceforge.net/

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Posted in June 27th, 2004

Loading JPG & PNG resources using GDI+

An article on the CodeProject detailing a user’s troubles with GDI+. In particular, he found that he was unable to load JPG or PNG files stored as resources with GDI+. This article presents a way to make it happen.

This article was updated June 17, 204.

http://www.codeproject.com/vcpp/gdiplus/cgdiplusbitmap.asp

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Posted in June 27th, 2004

PNGWriter

I can’t imagine a better description of this product than is found on the first line of their web page: “PNGwriter is a C++ class for creating PNG images.” And yes, it’s a free library, and it’s portable as all get-out, working on Win32, Linux, Mac OS X, and more.

Version 0.4.0 shipped in June, 2004.

http://pngwriter.sourceforge.net/

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Posted in June 27th, 2004

ZLib dotNet

Microsoft .NET Stream-derived objects that wrap ZLib inflate and deflate functions (C++ Mixed Mode implementation)

Version 1.0.1 is shipping as of June, 2004.

http://sourceforge.net/projects/zlibnetwrapper/

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Posted in June 27th, 2004

Peter’s Backup

Peters Backup is a program for backing up your important data files on to diskette, zip drive, fixed disk or CD/RW. It uses an extremely efficient compression algorithm. It keeps track of all versions of your files in full and incremental backups.

Version 1.16 is shipping as of June, 2004.

http://pbackup.sourceforge.net/summary.html

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Posted in June 27th, 2004

A Compressed Bitset Class

We have developed the CMJBitset class as a plug-in replacement for bitset. The CMJBitset classm depending on compilation optionsm may take as little as 7 bytes to represent a bitset of any size, assuming all the bits are set or reset. In comparision, a 1024 bitset will take 128 bytes. In essence, the CMJBitset operates […]

http://codeguru.com/Cpp/Cpp/cpp_mfc/bits/article.php/c7429/

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Posted in June 27th, 2004

Sixlegs PNG Library

Sixlegs PNG Library is a Java 1.1-compatible PNG decoder which features full compliance with the latest PNG specification. It supports all valid bit depths (grayscale/color), interlacing, palette-indexed images, alpha/transparency, gamma correction, access to all standard chunk data, private chunk handling, progressive display, and more

http://sixlegs.com/software/png/

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Posted in June 24th, 2004

Zip Utils - clean, elegant, simple, C++/win32

This source code shows how to add zip/unzip functionality to your programs. Claim to fame: simplicity and clean packaging.

http://codeproject.com/file/zip_utils.asp

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Posted in June 24th, 2004

MemoryStream Compression

An article that describes MemoryStream based Compression based on SharpZipLib.

Last updated June 21, 2004.

http://codeproject.com/useritems/mscompression.asp

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Posted in June 21st, 2004

PNG/MNG Construction Set

Published in Commercial Programs, PNG

PNG/MNG Construction Set represents the state of the art in animation software. It will assemble your original animations effortlessly through its Animation Wizard, squeeze them down to as close to nothing as possible with its Supercompressor; create eyecatching banners and animated transitions; manage your MNG files; add transparency to existing PNG graphics and a lot […]

http://www.mindworkshop.com/alchemy/pngpro.html

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Posted in June 20th, 2004

JBIG Kit

Markus Kuhn has this to say about it: I wrote the freely available JBIG-KIT 1.2 portable ANSI C library, which implements a highly effective lossless bi-level image compression algorithm based on context sensitive arithmetic coding. The JBIG algorithm (specified in ITU-T Recommendation T.82), which is implemented in this library, is especially suitable for compressing scanned […]

http://www.cl.cam.ac.uk/~mgk25/jbigkit/

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Posted in June 20th, 2004

ZipEnable for IIS

Unlike the compression built into IIS 4 and 5 (Windows NT/2000), IIS 6.0 offers out-of-the-box compression embedded into the core Web server code itself, allowing for extremely fast HTTP compression with minimal resource penalties.

Version 2.0 is shipping as of May, 2004.

http://www.port80software.com/products/zipenable/

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Posted in June 20th, 2004

Java FLAC Codec

FLAC is a port of the Free Lossless Audio Codec (FLAC) library to Java. This library allows java developers to experiment and write programs that use the FLAC algorithms.

Version 0.5 is shipping as of June, 2004.

http://jflac.sourceforge.net/

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Posted in June 20th, 2004

Self-Extracting Archive Utility

This program from Gammadyne is used to create a professional quality installation program out of an archive file.

Version 11.3 was shipping as of June, 2004.

http://www.gammadyne.com/seau.htm

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Posted in June 20th, 2004

PJL Compressing Filter

A J2EE servlet filter which compresses data written to the response. It supports several algorithms (gzip, deflate, etc.) and emphasizes minimal memory usage and high throughput. Also provides detailed performance stats.

http://sourceforge.net/projects/pjl-comp-filter/

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Posted in June 20th, 2004

zisofs-tools

The zisofs filesystem is an extension to the ISO9660 filesystem that allows files, on a file-by-file basis, to be stored compressed and decompressed in real time. The zisofs filesystem is supported by recent versions of Linux (2.4.14 or later). Legacy systems can still read uncompressed files. zisofs-tools contains the tools necessary to create such a […]

http://freshmeat.net/projects/zisofs-tools/

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Posted in June 20th, 2004

DOGG’s Compression Ratings

Published in Results, Archiving

A rating of roughly 20 different compressors - strictly based on size.

http://members.optushome.com.au/dogg01/compframe.htm

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Posted in June 20th, 2004

Generating random numbers

An article by Eric Uner talks a bit about generating reandom numbers, something we all want to do from time to time.

http://www.embedded.com/showArticle.jhtml?articleID=20900500

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Posted in June 20th, 2004

SimplyZip

Published in Commercial Programs, Zip

Does everything you want, and costs a lot less than the two market leaders!

Version 3.0 is shipping as of June, 2004.

http://www.simplyzip.com

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Posted in June 14th, 2004