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BWT & MTF encoder: Compress and decompress data using BWT and MTF

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  Author Author  
Picture of Robin
Name: Robin <contact>
Classes: 3 packages by
Country: The Netherlands The Netherlands
Age: 31
All time rank: 100329 in The Netherlands The Netherlands
Week rank: 1877 Down48 in The Netherlands The Netherlands Down
Innovation award
Innovation award
Nominee: 3x

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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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Name: BWT & MTF encoder
Base name: bwt
Description: Compress and decompress data using BWT and MTF
Version: -
PHP version: 4.1.0
License: GNU General Public License (GPL)
All time users: 908 users
All time rank: 3639
Week users: 0 users
Week rank: 1547 Equal
  Groups   Rate classes User ratings   Applications   Files Files  

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

  Innovation Award  
PHP Programming Innovation award nominee
December 2006
Number 6

Prize: One book of choice by SAMS
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

  User ratings  
RatingsUtility Consistency Documentation Examples Tests Videos Overall Rank
All time: Sufficient (62%) Good (87%) - Good (81%) - - Not sure (48%) 1758
Month: Not yet rated by the users

  Applications that use this package  
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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
Accessible without login Plain text file example.php Example Example usage

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