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, AutoCloseable

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

Fields

Modifier and Type	Field and Description
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

Constructors

Constructor and Description
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

Methods

Modifier and Type	Method and Description
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

Constructor Detail

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:

ZipException - if a GZIP format error has occurred or the compression method used is unsupported

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:

ZipException - if a GZIP format error has occurred or the compression method used is unsupported

IOException - if an I/O error has occurred

Method Detail

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.

Overrides:

read in class InflaterInputStream

Parameters:

buf - the buffer into which the data is read

off - the start offset in the destination array b

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

ZipException - if the compressed input data is corrupt.

IOException - if an I/O error has occurred.

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

Specified by:

close in interface AutoCloseable

Overrides:

close in class InflaterInputStream

Throws:

IOException - if an I/O error has occurred

See Also:

FilterInputStream.in