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Class: BWT & MTF encoder

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Name: BWT & MTF encoder Support forum
Base name: bwt
Description: Compress and decompress data using BWT and MTF
Version: -
Required PHP version: 4.1.0
License: GNU General Public License (GPL)
 
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Author

Picture of Robin Schuil
Name: Robin Schuil <e-mail contact>
Published packages: 3 Browse this author's classes Browse this author's classes
Country: The Netherlands The Netherlands - PHP jobs in The Netherlands
Home page: http://lunchpauze.blogspot.com/

Innovation Award

PHP Programming Innovation award nominee
December 2006
Number 6
 bzip2 is a compression program that achieves great data compression ratios.

PHP provides an extension that can implement bzip2 compression. However, that extension is not always available in all PHP distributions.

This class implements BWT and MTF data transformation algorithms that area also used by the bzip2 program. The class may be used to implement bzip2 like compression when the bzip2 extension is not available.

Manuel Lemos

Groups

Group folder image Algorithms Numerical and statistical algorithms View top rated classes
Group folder image Compression Data compression and file archive manipulation View top rated classes

Detailed description

This package can be used to compress and uncompress data using the Burrows-Wheeler transform (BWT) and Move-To-Front (MTF) encoder.

These data processing algorithms are commonly used in compression schemes employed by the bzip2 program.

Each of these algorithms are implemented in separate classes and do not require any special PHP extensions.

Applications that use this class

No application links were specified for this class.
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Files

File Role Description
Plain text file bwt.class.php Class Burrows-Wheeler transform
Plain text file mtf.class.php Class Move-To-Front encoder
Plain text file example.php Example Example usage
Download all files: bwt.tar.gz bwt.zip
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