Package org.apache.xmlgraphics.image.codec.png

Class PNGChunk

java.lang.Object

org.apache.xmlgraphics.image.codec.png.PNGChunk

public class PNGChunk
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	PNGChunk.ChunkType	See http://en.wikipedia.org/wiki/Portable_Network_Graphics for a light explanation; See http://www.libpng.org/pub/png/spec/1.2/PNG-Chunks.html for the spec.

Field Summary

Fields

Modifier and Type	Field	Description
(package private) int	crc
(package private) byte[]	data
(package private) int	length
protected static final org.apache.commons.logging.Log	log	logger
(package private) int	type
(package private) String	typeString

Constructor Summary

Constructors

Constructor	Description
PNGChunk(int length, int type, byte[] data, int crc)

Method Summary

Modifier and Type	Method	Description
byte	getByte(int offset)
static String	getChunkType(DataInputStream distream)	Returns the PNG chunk type, a four letter case sensitive ASCII type/name.
byte[]	getData()
int	getInt1(int offset)
int	getInt2(int offset)
int	getInt4(int offset)
int	getLength()
String	getString4(int offset)
int	getType()
String	getTypeString()
boolean	isType(String typeName)
static PNGChunk	readChunk(DataInputStream distream)	Reads the next chunk from the input stream.
static boolean	skipChunk(DataInputStream distream)	Skips the next chunk from the input stream.
private static String	typeIntToString(int type)

Methods inherited from class java.lang.Object

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

Field Details

length

int length

type

int type

data

byte[] data

crc

int crc

typeString

String typeString

log

protected static final org.apache.commons.logging.Log log

logger

Constructor Details

PNGChunk

public PNGChunk(int length,
 int type,
 byte[] data,
 int crc)

Method Details

getLength

public int getLength()

getType

public int getType()

getTypeString

public String getTypeString()

getData

public byte[] getData()

getByte

public byte getByte(int offset)

getInt1

public int getInt1(int offset)

getInt2

public int getInt2(int offset)

getInt4

public int getInt4(int offset)

getString4

public String getString4(int offset)

isType

public boolean isType(String typeName)

readChunk

public static PNGChunk readChunk(DataInputStream distream)

Reads the next chunk from the input stream.

Parameters:

distream - the input stream

Returns:

the chunk

getChunkType

public static String getChunkType(DataInputStream distream)

Returns the PNG chunk type, a four letter case sensitive ASCII type/name.

Parameters:

distream - the input stream

Returns:

a four letter case sensitive ASCII type/name

typeIntToString

private static String typeIntToString(int type)

skipChunk

public static boolean skipChunk(DataInputStream distream)

Skips the next chunk from the input stream.

Parameters:

distream - the input stream

Returns:

true if skipping successful, false otherwise