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InflaterInputStream (Java 2 Platform SE v1.4.1) - JDK 5 Documentation v1.4.1, Java 2 SDK 英文文档

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JavaTM 2 Platform
Std. Ed. v1.4.1
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java.util.zip
Class InflaterInputStream

java.lang.Object
  |
  +--java.io.InputStream
        |
        +--java.io.FilterInputStream
              |
              +--java.util.zip.InflaterInputStream
Direct Known Subclasses:
GZIPInputStream, ZipInputStream
public class InflaterInputStream
extends FilterInputStream

This class implements a stream filter for uncompressing data in the "deflate" compression format. It is also used as the basis for other decompression filters, such as GZIPInputStream.

See Also:
Inflater

Field Summary
protected  byte[] buf
          Input buffer for decompression.
protected  Inflater inf
          Decompressor for this stream.
protected  int len
          Length of input buffer.
 
Fields inherited from class java.io.FilterInputStream
in
 
Constructor Summary
InflaterInputStream(InputStream in)
          Creates a new input stream with a default decompressor and buffer size.
InflaterInputStream(InputStream in, Inflater inf)
          Creates a new input stream with the specified decompressor and a default buffer size.
InflaterInputStream(InputStream in, Inflater inf, int size)
          Creates a new input stream with the specified decompressor and buffer size.
 
Method Summary
 int available()
          Returns 0 after EOF has reached, otherwise always return 1.
 void close()
          Closes the input stream.
protected  void fill()
          Fills input buffer with more data to decompress.
 int read()
          Reads a byte of uncompressed data.
 int read(byte[] b, int off, int len)
          Reads uncompressed data into an array of bytes.
 long skip(long n)
          Skips specified number of bytes of uncompressed data.
 
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

inf

protected Inflater inf
Decompressor for this stream.

buf

protected byte[] buf
Input buffer for decompression.

len

protected int len
Length of input buffer.

Constructor Detail

InflaterInputStream

public InflaterInputStream(InputStream in,
                           Inflater inf,
                           int size)
Creates a new input stream with the specified decompressor and buffer size.

Parameters:
in - the input stream
inf - the decompressor ("inflater")
size - the input buffer size
Throws:
IllegalArgumentException - if size is <= 0

InflaterInputStream

public InflaterInputStream(InputStream in,
                           Inflater inf)
Creates a new input stream with the specified decompressor and a default buffer size.

Parameters:
in - the input stream
inf - the decompressor ("inflater")

InflaterInputStream

public InflaterInputStream(InputStream in)
Creates a new input stream with a default decompressor and buffer size.

Parameters:
in - the input stream
Method Detail

read

public int read()
         throws IOException
Reads a byte of uncompressed data. This method will block until enough input is available for decompression.

Overrides:
read in class FilterInputStream
Returns:
the byte read, or -1 if end of compressed input is reached
Throws:
IOException - if an I/O error has occurred
See Also:
FilterInputStream.in

read

public int read(byte[] b,
                int off,
                int len)
         throws IOException
Reads uncompressed data into an array of bytes. This method will block until some input can be decompressed.

Overrides:
read in class FilterInputStream
Parameters:
b - 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 is reached or a preset dictionary is needed
Throws:
ZipException - if a ZIP format error has occurred
IOException - if an I/O error has occurred
See Also:
FilterInputStream.in

available

public int available()
              throws IOException
Returns 0 after EOF has reached, otherwise always return 1.

Programs should not count on this method to return the actual number of bytes that could be read without blocking.

Overrides:
available in class FilterInputStream
Returns:
1 before EOF and 0 after EOF.
Throws:
IOException - if an I/O error occurs.
See Also:
FilterInputStream.in

skip

public long skip(long n)
          throws IOException
Skips specified number of bytes of uncompressed data.

Overrides:
skip in class FilterInputStream
Parameters:
n - the number of bytes to skip
Returns:
the actual number of bytes skipped.
Throws:
IOException - if an I/O error has occurred
IllegalArgumentException - if n < 0

close

public void close()
           throws IOException
Closes the input stream.

Overrides:
close in class FilterInputStream
Throws:
IOException - if an I/O error has occurred
See Also:
FilterInputStream.in

fill

protected void fill()
             throws IOException
Fills input buffer with more data to decompress.

Throws:
IOException - if an I/O error has occurred
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JavaTM 2 Platform
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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.