com.jcraft.jzlib (JZlib API)

Package

Class

Tree

Index

Help

PREV PACKAGE NEXT PACKAGE

FRAMES NO FRAMES

Package com.jcraft.jzlib

JZlib: a port of zlib to Java.

See:
Description

Class Summary
Deflate	Not to be used by applications.
JZlib	This static class holds all the constants used by the compression and decompression algorithms.
ZInputStream	An output stream wrapper around a `ZStream`.
ZOutputStream	An output stream wrapper around a `ZStream`.
ZStream	The core compression class: A pair of buffers with some metadata for compression or decompression, and the necessary compression/decompression methods.

Exception Summary
ZStreamException	Will be thrown by `ZInputStream` and `ZOutputStream` if something did go wrong during compressing or decompressing.

Package com.jcraft.jzlib Description

JZlib: a port of zlib to Java.

This package implements the deflate compressed data format described in RFC 1951 and the zlib compressed data format described in RFC 1950 (which is just a slim wrapper around the deflate format).

To use this package, you will normally use a ZStream, or the stream wrappers.

ZStream provides an API very like the original zlib API, thus you can use this if you are comfortable with this, or need precise control over the individual packets and the flushing behaviour.
The stream wrappers ZInputStream and ZOutputStream instead use the common InputStream/OutputStream API, and can be used wherever an InputStream or OutputStream is expected.

Following is some general information from the home page.

JZlib is a re-implementation of zlib in pure Java.
The first and final aim for hacking this stuff is to add the packet compression support to pure Java SSH systems.

Zlib

The zlib is designed to be a free, general-purpose, legally unencumbered -- that is, not covered by any patents -- lossless data-compression library for use on virtually any computer hardware and operating system. The zlib was written by Jean-loup Gailly (compression) and Mark Adler (decompression).

Features

Needless to say, JZlib can inflate data, which is deflated by zlib and JZlib can generate deflated data, which is acceptable and is inflated by zlib.
JZlib supports all compression levels and all flushing modes in zlib.
JZlib does not support gzip file handling.
The performance has not been estimated yet, but it will not be so bad in deflating/inflating data stream on the low bandwidth network.
JZlib is licensed under a BSD style license
No invention has been done in developing JZlib. So, if zlib is patent free, JZlib is also not covered by any patents.

Download

You can get the newest versions of JZlib on the JZlib home page.

Credits

JZlib has been developed by ymnk, but he has just re-implemented zlib in pure Java (this stuff was just required to improve the service on WiredX.net). So, all credit should go to authors Jean-loup Gailly and Mark Adler and contributors of zlib.