| package org.eclipse.swt.internal.image; | |
| /* | |
| * Copyright (c) 2000, 2002 IBM Corp. All rights reserved. | |
| * This file is 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 | |
| */ | |
| 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]; | |
| } | |
| } |