CADI.Common.LogicalTarget.JPEG2000.Codestream
Class PacketHeaderDataInputStream

java.lang.Object
  CADI.Common.LogicalTarget.JPEG2000.Codestream.PacketHeaderDataInputStream

public class PacketHeaderDataInputStream
extends java.lang.Object

This class implements a data input read to be read from the packet headers decoder. It abstracts from reading and discarting the 0xFF bytes which can be found in the packet header stream. Therefore, each call to the getTagBit() method returns a valid bit.

Version:

1.0.1 2008/12/27

Author:

Group on Interactive Coding of Images (GICI)

Field Summary

private BufferedDataInputStream	bufferedDataInputStream
private boolean	foundFF Boolean that indicates if a 0xFF has been found in the bytestream.
private byte	nextByte Variable used by the getTagBit function, needed to get bit by bit the packet data.
private int	numBit Variable used by the getTagBit function, needed to get bit by bit the data input stream Only positive values allowed.
private byte	readByte Variable used by the getTagBit function, needed to get bit by bit the packet data.

Constructor Summary

PacketHeaderDataInputStream()
Constructor.

PacketHeaderDataInputStream(BufferedDataInputStream bufferedDataInputStream)
Constructor

Method Summary

int	getTagBit() Retrieves a bit from the file.
void	list(java.io.PrintStream out) Prints this Packet Header Data Output Stream out to the specified output stream.
void	resetGetTagBit() Reset the getTagBit flags to reinitialize the reading.
void	setInput(BufferedDataInputStream bufferedDataInputStream)
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

bufferedDataInputStream

private BufferedDataInputStream bufferedDataInputStream

numBit

private int numBit

Variable used by the getTagBit function, needed to get bit by bit the data input stream

Only positive values allowed.

foundFF

private boolean foundFF

Boolean that indicates if a 0xFF has been found in the bytestream.

True indicates that a 0xFF byte has been found.

readByte

private byte readByte

Variable used by the getTagBit function, needed to get bit by bit the packet data. This is the byte readed.

Byte from the packet data.

nextByte

private byte nextByte

Variable used by the getTagBit function, needed to get bit by bit the packet data. This variable is used to save the next byte readed when detected an 0xFF (stuffing).

Byte from the packet data.

Constructor Detail

PacketHeaderDataInputStream

public PacketHeaderDataInputStream()

Constructor.

PacketHeaderDataInputStream

public PacketHeaderDataInputStream(BufferedDataInputStream bufferedDataInputStream)

Constructor

Parameters:

bufferedDataInputStream -

Method Detail

setInput

public void setInput(BufferedDataInputStream bufferedDataInputStream)

Parameters:

bufferedDataInputStream -

getTagBit

public int getTagBit()
              throws java.io.EOFException,
                     java.io.IOException

Retrieves a bit from the file. Function used in PacketDeheading.

Returns:

the readed bit

Throws:

java.io.EOFException - when end of file is reached

java.io.IOException - if an I/O error occurs

resetGetTagBit

public void resetGetTagBit()

Reset the getTagBit flags to reinitialize the reading.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

list

public void list(java.io.PrintStream out)

Prints this Packet Header Data Output Stream out to the specified output stream. This method is useful for debugging.

Parameters:

out - an output stream.