Class PngDecodingDataStream

java.lang.Object

java.io.InputStream

org.eclipse.swt.internal.image.PngDecodingDataStream

All Implemented Interfaces:

Closeable, AutoCloseable

public class PngDecodingDataStream
extends InputStream

Field Summary

Fields

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

Constructor Summary

Constructors

Constructor	Description
PngDecodingDataStream(InputStream stream)

Method Summary

Modifier and Type	Method	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 InputStream

available, mark, markSupported, nullInputStream, read, readAllBytes, readNBytes, readNBytes, reset, skip, skipNBytes, transferTo

Methods inherited from class Object

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

Field Details

stream

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 Details

PngDecodingDataStream

PngDecodingDataStream(InputStream stream)
               throws IOException

Throws:

IOException

Method Details

assertImageDataAtEnd

void assertImageDataAtEnd()
                   throws 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:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Overrides:

close in class InputStream

Throws:

IOException

getNextIdatBits

int getNextIdatBits(int length)
             throws IOException

Throws:

IOException

getNextIdatBit

int getNextIdatBit()
            throws IOException

Throws:

IOException

getNextIdatByte

byte getNextIdatByte()
              throws IOException

Throws:

IOException

updateAdler

void updateAdler(byte value)

read

public int read()
         throws IOException

Specified by:

read in class InputStream

Throws:

IOException

read

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

Overrides:

read in class InputStream

Throws:

IOException

error

void error()

readCompressedDataHeader

private void readCompressedDataHeader()
                               throws IOException

Throws:

IOException

checkAdler

void checkAdler()
         throws IOException

Throws:

IOException