# wzip

**Repository Path**: goldbeef/wzip

## Basic Information

- **Project Name**: wzip
- **Description**: wzip 是一款基于块排序的数据压缩软件，压缩性能与 bzip2 相当，但是压缩时间明显快于 bzip2。基于 BWT 变换，Wavelet tree, run-lenght 编码。支持与 bzip2 相兼容的参数选项，以及多进程工作模式。
- **Primary Language**: C
- **License**: GPL-2.0
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 24
- **Forks**: 4
- **Created**: 2015-10-30
- **Last Updated**: 2023-09-08

## Categories & Tags

**Categories**: application-software

**Tags**: None

## README

#Wzip
##What is it?
Wzip is a block-sorting compressor, based on Burrows-Wheeler transform (BWT), wavelet tree, run-length code . Its compression ratio is very good and close to bzip2 for most files except for audio and video files. Its compression speed is much faster than bzip2 even in single-thread workstate , and while in multi-thread workstate it will be much faster.
## How to use it?
###install  program

step 1: first get SAu.tgz form http://pizzachili.dcc.uchile.cl/indexes/Suffix_Array/, then decompress it and you will get directory  SAu_FILES; 

step 2: change directory to: SAu_FILES/ds/ , then make ; 

step 3: rename ds_ssort.a to libds_ssort.a ; 

step 4: up to now we get the lib libds_ssort.a ,and then copy out this lib to wzip project directroy ; 

step 5: change directory to wzip project directory, and then make to get wzip.
###example for use

While compressing a file "book",
  wzip -c book 
  or
  wzip -c -b 9 -e 3 -g 1 -p 2 -v 3  book

While decompressing a file "book.wz"
  wzip -d book.wz

while getting help
  wzip -L
###references
1. 赵恒，霍红卫（导师），基于BWT和小波树的数据压缩算法研究与实现，西安电子科技大学硕士论文，2014
2. 赵恒，霍红卫, 基于BWT和小波树的数据压缩算法, 技术报告.
3. L. Foschini, R. Grossi, A. Gupta, and J. S. Vitter, Fast Compression with a Static Model in High-Order Entropy. In Proc. IEEE Data Compression Conference (DCC), Snowbird, Utah, pages 62–71, March 2004.

###about
AUTHOR
goldbeef (goldbeef@163.com) ,xidian university , CHINA.
NOTE
these source codes were written on 32 bit  computer with linux OS.