/******************************************************************************* * Copyright (c) 2000, 2003 IBM Corporation and others. * All rights reserved. This program and the accompanying materials  * are made available under the terms of the Common Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/cpl-v10.html *  * Contributors: *     IBM Corporation - initial API and implementation *******************************************************************************/package org.eclipse.swt.internal.image;import org.eclipse.swt.*;class PngIdatChunk extends PngChunk {PngIdatChunk(byte[] reference){	super(reference);}/** * Answer whether the chunk is a valid IDAT chunk. */void validate(PngFileReadState readState, PngIhdrChunk headerChunk) {	if (!readState.readIHDR		|| (headerChunk.getMustHavePalette() && !readState.readPLTE)		|| readState.readIEND) 	{		SWT.error(SWT.ERROR_INVALID_IMAGE);	} else {		readState.readIDAT = true;	}		super.validate(readState, headerChunk);}byte getDataByteAtOffset(int offset) {	return reference[DATA_OFFSET + offset];}}