ch.rgw.compress
Class HuffmanOutputStream

java.lang.Object
  java.io.OutputStream
      ch.rgw.compress.HuffmanOutputStream

All Implemented Interfaces:

java.io.Closeable, java.io.Flushable

public class HuffmanOutputStream
extends java.io.OutputStream

A Stream that compresses its output on the fly with the Huffmann algorithm
A Huffman tree can be provided by the caller. The tree can be declared dynamic to be recomputed regularly (for not in advance analyzable Stream with very variable data).

Author:

Gerry

Constructor Summary

HuffmanOutputStream(java.io.OutputStream sup, HuffmanTree tr, int dynamic)
The only Constructor

Method Summary

void	close() terminate the stream: An EOF marker is written and he Stream is closed.
void	flush()
static java.lang.String	Version()
void	write(int c)

Methods inherited from class java.io.OutputStream

write, write

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

HuffmanOutputStream

public HuffmanOutputStream(java.io.OutputStream sup,
                           HuffmanTree tr,
                           int dynamic)
                    throws java.io.IOException

The only Constructor

Parameters:

sup - a Stream to receive the output ultimately

tree - tree a precomputed Huffman tree or null. If null, a standard tree for textual files will be used.

dynamic - if !=0: The tree will be recomputed every bytes

Throws:

java.io.IOException

Method Detail

Version

public static java.lang.String Version()

write

public void write(int c)
           throws java.io.IOException

Specified by:

write in class java.io.OutputStream

Throws:

java.io.IOException

flush

public void flush()
           throws java.io.IOException

Specified by:

flush in interface java.io.Flushable

Overrides:

flush in class java.io.OutputStream

Throws:

java.io.IOException

close

public void close()
           throws java.io.IOException

terminate the stream: An EOF marker is written and he Stream is closed. If you don't store Informations about the length of the original data, you should always end with close(), because HuffmanInputStream can not determine the end of the compressed data.

Specified by:

close in interface java.io.Closeable

Overrides:

close in class java.io.OutputStream

Throws:

java.io.IOException