java.util.zip
Class GZIPInputStream

java.lang.Object
  java.io.InputStream
      java.io.FilterInputStream
          java.util.zip.InflaterInputStream
              java.util.zip.GZIPInputStream

All Implemented Interfaces:

Closeable

public class GZIPInputStream
extends InflaterInputStream

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

See Also:

InflaterInputStream

Field Summary
protected   CRC32	crc           CRC-32 for uncompressed data.
protected  boolean	eos           Indicates end of input stream.
static int	GZIP_MAGIC           GZIP header magic number.

 

Fields inherited from class java.util.zip. InflaterInputStream
buf , inf , len

 

Fields inherited from class java.io. FilterInputStream
in

 

Constructor Summary
GZIPInputStream ( InputStream  in)           Creates a new input stream with a default buffer size.
GZIPInputStream ( InputStream  in, int size)           Creates a new input stream with the specified buffer size.

 

Method Summary
void	close ()           Closes this input stream and releases any system resources associated with the stream.
int	read (byte[] buf, int off, int len)           Reads uncompressed data into an array of bytes.

 

Methods inherited from class java.util.zip. InflaterInputStream
available , fill , mark , markSupported , read , reset , skip

 

Methods inherited from class java.io. FilterInputStream
read

 

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 for uncompressed data.

eos

protected boolean eos

Indicates end of input stream.

GZIP_MAGIC

public static final int GZIP_MAGIC

GZIP header magic number.

See Also:

Constant Field Values

GZIPInputStream

public GZIPInputStream(InputStream in,
                       int size)
                throws IOException

Creates a new input stream with the specified buffer size.

Parameters:

in - the input stream

size - the input buffer size

Throws:

IOException - if an I/O error has occurred

IllegalArgumentException - if size is <= 0

GZIPInputStream

public GZIPInputStream(InputStream in)
                throws IOException

Creates a new input stream with a default buffer size.

Parameters:

in - the input stream

Throws:

IOException - if an I/O error has occurred

read

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

Reads uncompressed data into an array of bytes. If len is not zero, the method will block until some input can be decompressed; otherwise, no bytes are read and 0 is returned. Blocks until enough input is available for decompression.

Overrides:

read in class InflaterInputStream

Parameters:

buf - the buffer into which the data is read

off - the start offset in of the destination array b data

len - the maximum number of bytes read

Returns:

the actual number of bytes read, or -1 if the end of the compressed input stream is reached

Throws:

NullPointerException - If buf is null.

IndexOutOfBoundsException - If off is negative, len is negative, or len is greater than buf.length - off

IOException - if an I/O error has occurred or the compressed input data is corrupt

See Also:

FilterInputStream.in

close

public void close()
           throws IOException

Closes this input stream and releases any system resources associated with the stream.

Specified by:

close in interface Closeable

Overrides:

close in class InflaterInputStream

Throws:

IOException - if an I/O error has occurred

See Also:

FilterInputStream.in