java.util.zip
Class GZIPOutputStream

java.lang.Object
  |
  +--java.io.OutputStream
        |
        +--java.io.FilterOutputStream
              |
              +--java.util.zip.DeflaterOutputStream
                    |
                    +--java.util.zip.GZIPOutputStream

public class GZIPOutputStream

extends DeflaterOutputStream

This class implements a stream filter for writing compressed data in the GZIP file format.

Field Summary

protected CRC32

crc CRC-32 of uncompressed data.

Fields inherited from class java.util.zip.DeflaterOutputStream

buf, def

Fields inherited from class java.io.FilterOutputStream

out

Constructor Summary

GZIPOutputStream(OutputStream out)
Creates a new output stream with a default buffer size.

GZIPOutputStream(OutputStream out, int size)
Creates a new output stream with the specified buffer size.

Method Summary

void	close() Writes remaining compressed data to the output stream and closes the underlying stream.
void	finish() Finishes writing compressed data to the output stream without closing the underlying stream.
void	write(byte[] buf, int off, int len) Writes array of bytes to the compressed output stream.

Methods inherited from class java.util.zip.DeflaterOutputStream

deflate, write

Methods inherited from class java.io.FilterOutputStream

flush, write

Methods inherited from class java.lang.Object

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

Field Detail

crc

protected CRC32 crc

CRC-32 of uncompressed data.

Constructor Detail

GZIPOutputStream

public GZIPOutputStream(OutputStream out,
                        int size)
                 throws IOException

Creates a new output stream with the specified buffer size.

Parameters:

out - the output stream

size - the output buffer size

Throws:

IOException - If an I/O error has occurred.

IllegalArgumentException - if size is <= 0

GZIPOutputStream

public GZIPOutputStream(OutputStream out)
                 throws IOException

Creates a new output stream with a default buffer size.

Parameters:

out - the output stream

Throws:

IOException - If an I/O error has occurred.

Method Detail

write

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

Writes array of bytes to the compressed output stream. This method will block until all the bytes are written.

Parameters:

buf - the data to be written

off - the start offset of the data

len - the length of the data

Throws:

IOException - If an I/O error has occurred.

Overrides:

write in class DeflaterOutputStream

finish

public void finish()
            throws IOException

Finishes writing compressed data to the output stream without closing the underlying stream. Use this method when applying multiple filters in succession to the same output stream.

Throws:

IOException - if an I/O error has occurred

Overrides:

finish in class DeflaterOutputStream

close

public void close()
           throws IOException

Writes remaining compressed data to the output stream and closes the underlying stream.

Throws:

IOException - if an I/O error has occurred

Overrides:

close in class DeflaterOutputStream