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Java 2 Platform SE v1.3.1: Class GZIPInputStream - JDK 5 Documentation v1.3.1, Java 2 SDK 英文文档

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java.util.zip
Class GZIPInputStream

java.lang.Object
  |
  +--java.io.InputStream
        |
        +--java.io.FilterInputStream
              |
              +--java.util.zip.InflaterInputStream
                    |
                    +--java.util.zip.GZIPInputStream

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public class GZIPInputStream

extends InflaterInputStream

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

See Also:

InflaterInputStream

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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 the input 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, read, skip

 

Methods inherited from class java.io.FilterInputStream

mark, markSupported, read, reset

 

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.

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eos

protected boolean eos

Indicates end of input stream.

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GZIP_MAGIC

public static final int GZIP_MAGIC

GZIP header magic number.

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:

IOException - if an I/O error has occurred

IllegalArgumentException - if size is <= 0

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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

Method Detail

read

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

Reads uncompressed data into an array of bytes. 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 of the 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:

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

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close

public void close()
           throws IOException

Closes the input stream.

Overrides:

close in class InflaterInputStream

Throws:

IOException - if an I/O error has occurred

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