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GZIPInputStream (Java Platform SE 6) - JDK 5 Documentation v6.0, 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

All Implemented Interfaces:

Closeable

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public class GZIPInputStream
extends InflaterInputStream

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

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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.

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:

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. 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

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

See Also:

FilterInputStream.in

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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

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For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2006 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.