Java™ Platform
Standard Ed. 6

java.util.zip
Class InflaterInputStream

java.lang.Object
  extended by java.io.InputStream
      extended by java.io.FilterInputStream
          extended by java.util.zip.InflaterInputStream
All Implemented Interfaces:
Closeable
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 been reached, otherwise always return 1.
 void close()
          Closes this input stream and releases any system resources associated with the stream.
protected  void fill()
          Fills input buffer with more data to decompress.
 void mark(int readlimit)
          Marks the current position in this input stream.
 boolean markSupported()
          Tests if this input stream supports the mark and reset methods.
 int read()
          Reads a byte of uncompressed data.
 int read(byte[] b, int off, int len)
          Reads uncompressed data into an array of bytes.
 void reset()
          Repositions this stream to the position at the time the mark method was last called on this input stream.
 long skip(long n)
          Skips specified number of bytes of uncompressed data.
 
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

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. 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 FilterInputStream
Parameters:
b - 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 is reached or a preset dictionary is needed
Throws:
NullPointerException - If b is null.
IndexOutOfBoundsException - If off is negative, len is negative, or len is greater than b.length - off
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 been 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.

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

Specified by:
close in interface Closeable
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

markSupported

public boolean markSupported()
Tests if this input stream supports the mark and reset methods. The markSupported method of InflaterInputStream returns false.

Overrides:
markSupported in class FilterInputStream
Returns:
a boolean indicating if this stream type supports the mark and reset methods.
See Also:
InputStream.mark(int), InputStream.reset()

mark

public void mark(int readlimit)
Marks the current position in this input stream.

The mark method of InflaterInputStream does nothing.

Overrides:
mark in class FilterInputStream
Parameters:
readlimit - the maximum limit of bytes that can be read before the mark position becomes invalid.
See Also:
InputStream.reset()

reset

public void reset()
           throws IOException
Repositions this stream to the position at the time the mark method was last called on this input stream.

The method reset for class InflaterInputStream does nothing except throw an IOException.

Overrides:
reset in class FilterInputStream
Throws:
IOException - if this method is invoked.
See Also:
InputStream.mark(int), IOException

Java™ Platform
Standard Ed. 6

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