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org.jempeg.empeg.protocol
Class EmpegInputStream  

java.lang.Object
  java.io.InputStream
      org.jempeg.empeg.protocol.EmpegInputStream

All Implemented Interfaces:

java.io.Closeable

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public class EmpegInputStream

extends java.io.InputStream

EmpegInputStream is an InputStream that implements the type conversion (both endianness and signedness/unsignedness) that matches that of the Empeg's protocol.

Version:

$Revision: 1.6 $

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Field Summary
private  byte[]	myBuf16
private  byte[]	myBuf32
private  java.io.InputStream	myIS

 

Constructor Summary

EmpegInputStream(java.io.InputStream _is)

 

Method Summary
int	available()           This method returns the number of bytes that can be read from this stream before a read can block.
void	close()           This method closes the stream.
void	mark(int _mark)           This method marks a position in the input to which the stream can be "reset" by calling the reset() method.
boolean	markSupported()           This method returns a boolean that indicates whether the mark/reset methods are supported in this class.
int	read()           This method reads an unsigned byte from the input stream and returns it as an int in the range of 0-255.
int	read(byte[] _buffer)           Slightly different symantics than normal read just for convenience.
int	read(byte[] _buffer, int _offset, int _length)           This method read bytes from a stream and stores them into a caller supplied buffer.
short	readSigned16()
int	readSigned32()
byte	readSigned8()
int	readUnsigned16()
long	readUnsigned32()
short	readUnsigned8()
void	reset()           This method resets a stream to the point where the mark() method was called.
long	skip(long _skipCount)           This method skips the specified number of bytes in the stream.

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

myBuf16

private byte[] myBuf16

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myBuf32

private byte[] myBuf32

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myIS

private java.io.InputStream myIS

Constructor Detail

EmpegInputStream

public EmpegInputStream(java.io.InputStream _is)

Method Detail

available

public int available()
              throws java.io.IOException

Description copied from class: java.io.InputStream

This method returns the number of bytes that can be read from this stream before a read can block. A return of 0 indicates that blocking might (or might not) occur on the very next read attempt.

This method always returns 0 in this class

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skip

public long skip(long _skipCount)
          throws java.io.IOException

Description copied from class: java.io.InputStream

This method skips the specified number of bytes in the stream. It returns the actual number of bytes skipped, which may be less than the requested amount.

This method reads and discards bytes into a byte array until the specified number of bytes were skipped or until either the end of stream is reached or a read attempt returns a short count. Subclasses can override this metho to provide a more efficient implementation where one exists.

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read

public int read()
         throws java.io.IOException

Description copied from class: java.io.InputStream

This method reads an unsigned byte from the input stream and returns it as an int in the range of 0-255. This method also will return -1 if the end of the stream has been reached.

This method will block until the byte can be read.

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mark

public void mark(int _mark)

Description copied from class: java.io.InputStream

This method marks a position in the input to which the stream can be "reset" by calling the reset() method. The parameter @code{readlimit} is the number of bytes that can be read from the stream after setting the mark before the mark becomes invalid. For example, if mark() is called with a read limit of 10, then when 11 bytes of data are read from the stream before the reset() method is called, then the mark is invalid and the stream object instance is not required to remember the mark.

This method does nothing in this class, but subclasses may override it to provide mark/reset functionality.

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markSupported

public boolean markSupported()

Description copied from class: java.io.InputStream

This method returns a boolean that indicates whether the mark/reset methods are supported in this class. Those methods can be used to remember a specific point in the stream and reset the stream to that point.

This method always returns false in this class, but subclasses can override this method to return true if they support mark/reset functionality.

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reset

public void reset()
           throws java.io.IOException

Description copied from class: java.io.InputStream

This method resets a stream to the point where the mark() method was called. Any bytes that were read after the mark point was set will be re-read during subsequent reads.

This method always throws an IOException in this class, but subclasses can override this method if they provide mark/reset functionality.

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close

public void close()
           throws java.io.IOException

Description copied from class: java.io.InputStream

This method closes the stream. Any futher attempts to read from the stream may generate an IOException

This method does nothing in this class, but subclasses may override this method in order to provide additional functionality.

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read

public int read(byte[] _buffer)
         throws java.io.IOException

Slightly different symantics than normal read just for convenience. This is guaranteed to read _buffer.length many bytes from the stream (as opposed to reading "up to" _buffer.length many bytes from the stream.

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read

public int read(byte[] _buffer,
                int _offset,
                int _length)
         throws java.io.IOException

Description copied from class: java.io.InputStream

This method read bytes from a stream and stores them into a caller supplied buffer. It starts storing the data at index off into the buffer and attempts to read len bytes. This method can return before reading the number of bytes requested. The actual number of bytes read is returned as an int. A -1 is returned to indicate the end of the stream.

This method will block until some data can be read.

This method operates by calling the single byte read() method in a loop until the desired number of bytes are read. The read loop stops short if the end of the stream is encountered or if an IOException is encountered on any read operation except the first. If the first attempt to read a bytes fails, the IOException is allowed to propagate upward. And subsequent IOException is caught and treated identically to an end of stream condition. Subclasses can (and should if possible) override this method to provide a more efficient implementation.

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readSigned8

public byte readSigned8()
                 throws java.io.IOException

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readUnsigned8

public short readUnsigned8()
                    throws java.io.IOException

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readSigned16

public short readSigned16()
                   throws java.io.IOException

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readUnsigned16

public int readUnsigned16()
                   throws java.io.IOException

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readSigned32

public int readSigned32()
                 throws java.io.IOException

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readUnsigned32

public long readUnsigned32()
                    throws java.io.IOException

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Home >> All >> org >> jempeg >> empeg >> [ protocol overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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