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Class: BWT & MTF encoder

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  Classes of Robin Schuil  >  BWT & MTF encoder  >  Download .tar.gz .zip  >  Support forum Support forum  >  Blog Blog  >  RSS 1.0 feed RSS 2.0 feed Latest changes  
Name: BWT & MTF encoder
Support forum Support forum
Base name: bwt
Description: Compress and decompress data using BWT and MTF
Related classes: , , , , , , ,
Version: -
PHP version: 4.1.0
License: GNU General Public License (GPL)
All time users: 763 users
All time rank: 3566
Week users: 1 user
Week rank: 2503
Picture of Robin Schuil
Author: Robin Schuil <e-mail contact>
Packages: 3 Browse this author's classes Browse this author's classes
Country: The Netherlands The Netherlands - PHP jobs in The Netherlands
Age: 29
All time rank: 95230 in The Netherlands The Netherlands
Week rank: 874 Up20 Up in The Netherlands The Netherlands
Innovation award
Innovation award
Nominee: 3x


  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.

 

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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

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  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

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  Applications that use this class  
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  Files folder image 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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