Burrows-Wheeler Transform Library 0.5

Operating systemsOS : Windows / Linux / Mac OS / BSD / Solaris
Program licensingScript Licensing : LGPL - GNU Lesser General Public License
CreatedCreated : May 19, 2010
Size downloadDownloads : 4
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The code is derived from "A Block-sorting Lossless ...

The code is derived from "A Block-sorting Lossless Data compress Algorithm" by M. Burrows and D. J. Wheeler.
The Burrows-Wheeler transform (BWT) is not actually a compression. In fact BWT requires that a small amount of additional information be stored with the transformed data so that the transformation may be reversed.
This makes the transformed data larger than its original form.
BWT is useful because it converts the data into a format that is generally more compressible by run length encoders and statistical encoders with order greater than 0.
By additionally applying move-to-front coding, the data will be in a format which is generally more compressible by even zero order statistical encoders such as traditional implementations of Huffman coding or arithmetic coding.
The Burrows-Wheeler transform is applied on blocks of input data (symbols). It is usually the case that larger blocks result in greater compressibility of the transformed data at the expense of time and system resources.
One of the effects of BWT is to produce blocks of data with more and longer runs (strings of identical symbols) than those found in the original data.
The increasing the number of runs and their lengths tends to improve a the compressibility of data.
News in the current Burrows-Wheeler Transform Library by Michael Dipperstein version:
• Replaces getopt with my optlist library.
• Explicitly licensed the library under LGPL version 3.

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