Class PngIdatChunk

java.lang.Object

org.eclipse.swt.internal.image.PngChunk

org.eclipse.swt.internal.image.PngIdatChunk

class PngIdatChunk
extends PngChunk

Field Summary

Fields

Modifier and Type	Field	Description
(package private) static final int	ADLER_DATA_OFFSET
(package private) static final int	ADLER_FIELD_LENGTH
(package private) static final int	HEADER_BYTE1_DATA_OFFSET
(package private) static final int	HEADER_BYTE2_DATA_OFFSET
(package private) static final int	HEADER_BYTES_LENGTH

Fields inherited from class PngChunk

CHUNK_IDAT, CHUNK_IEND, CHUNK_IHDR, CHUNK_PLTE, CHUNK_tRNS, CHUNK_UNKNOWN, CRC_TABLE, DATA_OFFSET, length, LENGTH_FIELD_LENGTH, LENGTH_OFFSET, MIN_LENGTH, reference, TYPE_FIELD_LENGTH, TYPE_IDAT, TYPE_IEND, TYPE_IHDR, TYPE_OFFSET, TYPE_PLTE, TYPE_tRNS

Constructor Summary

Constructors

Constructor	Description
PngIdatChunk(byte[] reference)
PngIdatChunk(byte headerByte1, byte headerByte2, byte[] data, int adler)

Method Summary

Modifier and Type	Method	Description
(package private) int	getChunkType()
(package private) byte	getDataByteAtOffset(int offset)
(package private) void	validate(PngFileReadState readState, PngIhdrChunk headerChunk)	Answer whether the chunk is a valid IDAT chunk.

Methods inherited from class PngChunk

checkCRC, computeCRC, contributeToString, getCRC, getData, getInt16, getInt32, getLength, getReference, getSize, getTypeBytes, isCritical, readNextFromStream, setCRC, setData, setInt16, setInt32, setLength, setReference, setType, toString, typeMatchesArray

Methods inherited from class Object

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

Field Details

HEADER_BYTES_LENGTH

static final int HEADER_BYTES_LENGTH

See Also:

• Constant Field Values

ADLER_FIELD_LENGTH

static final int ADLER_FIELD_LENGTH

See Also:

• Constant Field Values

HEADER_BYTE1_DATA_OFFSET

static final int HEADER_BYTE1_DATA_OFFSET

See Also:

• Constant Field Values

HEADER_BYTE2_DATA_OFFSET

static final int HEADER_BYTE2_DATA_OFFSET

See Also:

• Constant Field Values

ADLER_DATA_OFFSET

static final int ADLER_DATA_OFFSET

See Also:

• Constant Field Values

Constructor Details

PngIdatChunk

PngIdatChunk(byte headerByte1,
 byte headerByte2,
 byte[] data,
 int adler)

PngIdatChunk

PngIdatChunk(byte[] reference)

Method Details

getChunkType

int getChunkType()

Overrides:

getChunkType in class PngChunk

validate

void validate(PngFileReadState readState,
 PngIhdrChunk headerChunk)

Answer whether the chunk is a valid IDAT chunk.

Overrides:

validate in class PngChunk

getDataByteAtOffset

byte getDataByteAtOffset(int offset)