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/*******************************************************************************
* 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 Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.internal.image;
import org.eclipse.swt.*;
class PngIendChunk extends PngChunk {
PngIendChunk() {
super(0);
setType(TYPE_IEND);
setCRC(computeCRC());
}
PngIendChunk(byte[] reference){
super(reference);
}
/**
* Answer whether the chunk is a valid IEND chunk.
*/
void validate(PngFileReadState readState, PngIhdrChunk headerChunk) {
// An IEND chunk is invalid if no IHDR has been read.
// Or if a palette is required and has not been read.
// Or if no IDAT chunk has been read.
if (!readState.readIHDR
|| (headerChunk.getMustHavePalette() && !readState.readPLTE)
|| !readState.readIDAT
|| readState.readIEND)
{
SWT.error(SWT.ERROR_INVALID_IMAGE);
} else {
readState.readIEND = true;
}
super.validate(readState, headerChunk);
// IEND chunks are not allowed to have any data.
if (getLength() > 0) SWT.error(SWT.ERROR_INVALID_IMAGE);
}
}
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