org.eclipse.swt.internal.image

Class PngDecodingDataStream

java.lang.Object

java.io.InputStream

org.eclipse.swt.internal.image.PngDecodingDataStream

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

public class PngDecodingDataStream
extends java.io.InputStream

Structure Diagram

Field Summary

Fields

Modifier and Type	Field and Description
(package private) int	adlerValue
(package private) byte	currentByte
(package private) PngLzBlockReader	lzBlockReader
(package private) static int	MAX_BIT
(package private) int	nextBitIndex
(package private) static int	PRIME
(package private) java.io.InputStream	stream

Constructor Summary

Constructors

Constructor and Description
PngDecodingDataStream(java.io.InputStream stream)

Method Summary

Methods

Modifier and Type	Method and Description
(package private) void	assertImageDataAtEnd() This method should be called when the image decoder thinks that all of the compressed image data has been read.
(package private) void	checkAdler()
void	close()
(package private) void	error()
(package private) int	getNextIdatBit()
(package private) int	getNextIdatBits(int length)
(package private) byte	getNextIdatByte()
int	read()
int	read(byte[] buffer, int off, int len)
private void	readCompressedDataHeader()
(package private) void	updateAdler(byte value)

Methods inherited from class java.io.InputStream

available, mark, markSupported, read, reset, skip

Methods inherited from class java.lang.Object

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

Field Detail

stream

java.io.InputStream stream

currentByte

byte currentByte

nextBitIndex

int nextBitIndex

lzBlockReader

PngLzBlockReader lzBlockReader

adlerValue

int adlerValue

PRIME

static final int PRIME

See Also:

Constant Field Values

MAX_BIT

static final int MAX_BIT

See Also:

Constant Field Values

Constructor Detail

PngDecodingDataStream

PngDecodingDataStream(java.io.InputStream stream)
                throws java.io.IOException

Throws:

java.io.IOException

Method Detail

assertImageDataAtEnd

void assertImageDataAtEnd()
                    throws java.io.IOException

This method should be called when the image decoder thinks that all of the compressed image data has been read. This method will ensure that the next data value is an end of block marker. If there are more blocks after this one, the method will read them and ensure that they are empty.

Throws:

java.io.IOException

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Overrides:

close in class java.io.InputStream

Throws:

java.io.IOException

getNextIdatBits

int getNextIdatBits(int length)
              throws java.io.IOException

Throws:

java.io.IOException

getNextIdatBit

int getNextIdatBit()
             throws java.io.IOException

Throws:

java.io.IOException

getNextIdatByte

byte getNextIdatByte()
               throws java.io.IOException

Throws:

java.io.IOException

updateAdler

void updateAdler(byte value)

read

public int read()
         throws java.io.IOException

Specified by:

read in class java.io.InputStream

Throws:

java.io.IOException

read

public int read(byte[] buffer,
       int off,
       int len)
         throws java.io.IOException

Overrides:

read in class java.io.InputStream

Throws:

java.io.IOException

error

void error()

readCompressedDataHeader

private void readCompressedDataHeader()
                               throws java.io.IOException

Throws:

java.io.IOException

checkAdler

void checkAdler()
          throws java.io.IOException

Throws:

java.io.IOException