de.enough.polish.util.zip
Class GZipOutputStream

java.lang.Object
  java.io.OutputStream
      de.enough.polish.util.zip.GZipOutputStream

All Implemented Interfaces:

Closeable, Flushable

public class GZipOutputStream
extends OutputStream

Generates GZIP or DEFLATE encoded input streams from an InputStream.

Copyright Enough Software 2007 - 2010

 history
        Jun 28, 2007 - Simon creation
 

Author:

Simon Schmitt, simon.schmitt@enough.de

Field Summary

static int	TYPE_DEFLATE This constant triggers the normal deflate compression as described in rfc 1951.
static int	TYPE_GZIP This constant triggers the gzip compression that is the same as deflate with some extra header information (see rfc 1952).

Constructor Summary

GZipOutputStream(OutputStream outputStream, int size, int compressionType, int plainWindowSize, int huffmanWindowSize)

Method Summary

void	close()
void	flush() It is strongly recomended NOT to call flush before close() since close() is able to handle the flushing better itself.
void	write(byte[] b)
void	write(byte[] b, int off, int len)
void	write(int b)

Methods inherited from class java.lang.Object

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

Field Detail

TYPE_DEFLATE

public static final int TYPE_DEFLATE

This constant triggers the normal deflate compression as described in rfc 1951.

See Also:

Constant Field Values

TYPE_GZIP

public static final int TYPE_GZIP

This constant triggers the gzip compression that is the same as deflate with some extra header information (see rfc 1952).

See Also:

Constant Field Values

Constructor Detail

GZipOutputStream

public GZipOutputStream(OutputStream outputStream,
                        int size,
                        int compressionType,
                        int plainWindowSize,
                        int huffmanWindowSize)
                 throws IOException

Parameters:

outputStream - stream to write the compressed data in

size - prefered size of the internal buffer

compressionType - TYPE_GZIP or TYPE_DEFLATE

plainWindowSize - this size is important for the lz77 search. Larger values will result in better compression. Maximum is 32768.

huffmanWindowSize - this size is important for the huffmanencoding. A large value will result to a better frequency statistic and therefore to a better compression.

Throws:

IOException - might be thrown in case that the inputStream can not be read, the outputStream can not be written into or in case of wrong arguments

See Also:

TYPE_DEFLATE, TYPE_GZIP

Method Detail

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Overrides:

close in class OutputStream

Throws:

IOException

flush

public void flush()
           throws IOException

It is strongly recomended NOT to call flush before close() since close() is able to handle the flushing better itself.

Specified by:

flush in interface Flushable

Overrides:

flush in class OutputStream

Throws:

IOException

write

public void write(int b)
           throws IOException

Specified by:

write in class OutputStream

Throws:

IOException

write

public void write(byte[] b)
           throws IOException

Overrides:

write in class OutputStream

Throws:

IOException

write

public void write(byte[] b,
                  int off,
                  int len)
           throws IOException

Overrides:

write in class OutputStream

Throws:

IOException