GRZip II

Table of Contents

Usage
Info
Description
Features
Source
Related Urls
Comments
Version 0.2.2 - 02/10/2003

cmd:GRZipII

Usage

GRZipII <e|d> InputFile OutputFile <Switches>

-p       Disable all Preprocessing techniques
-m<mode> Compression algorithms, default: -m1
         -m1 LZP + BWT + WFC + EC
         -m2 LZP + BWT + MTF + EC
         -m3 LZP + ST4 + WFC + EC
         -m4 LZP + ST4 + MTF + EC
-S       Use alternative BWT Sorting algorithm
         (faster for repetitive blocks)

English/Russian Text: -pm1
Dictionary: -pm3
WinWord/WinExcel file: -Spm1
OS/2 ini file: -Spm1
C-sources: -Spm1
EXE: -pm1

Info

GRZipII, is yet another BSLDCA compressor.

NB, bzip2 is the most well-known BSLDCA compressor. It uses BWT ` MTF ` Huffman algorithm.

Description

GRZipII is a high-performance file compressor. It uses the Block-Sorting Lossless Data Compression Algorithm (BSLDCA), which has received considerable attention over recent years for both its simplicity and effectiveness.

To top all this off, the program appears to be free, and there are DOS, Windows, and Linux ports all available at the link given below.

Features

GRZipII is based on Burrows-Wheeler Transform (BWT), Schindler Transform (ST4), Move-To-Front (MTF) and Weighted Frequency Counting (WFC) algorithms.

This implementation has compression rate of 2.234 bps on the Calgary Corpus(14 files) without preprocessing.

Source

http://magicssoft.ru/?folder=projects&page=GRZipII

Related Urls

http://datacompression.info/

Comments

Version 0.2.2 - 02/10/2003

Test Run

grzip e readme.txt readme.grz cat readme.txt | gzip > readme.gz cat readme.txt | bzip2 > readme.bz2

1004 Nov 26 11:00 readme.bz2
 955 Nov 26 10:59 readme.grz
 958 Nov 26 10:59 readme.gz
1810 Nov  9 08:27 readme.txt*