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annotate dwt/internal/image/PngIendChunk.d @ 34:5123b17c98ef

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Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Sun, 14 Sep 2008 01:45:57 +0200
parents 1a8b3cb347e0
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2006 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module dwt.internal.image.PngIendChunk;
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16 import dwt.DWT;
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17 import dwt.internal.image.PngFileReadState;
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18 import dwt.internal.image.PngIhdrChunk;
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19 import dwt.internal.image.PngChunk;
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21 class PngIendChunk : PngChunk {
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23 this() {
0
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24 super(0);
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25 setType(TYPE_IEND);
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26 setCRC(computeCRC());
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27 }
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29 this(byte[] reference){
0
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30 super(reference);
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31 }
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33 override int getChunkType() {
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34 return CHUNK_IEND;
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35 }
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37 /**
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38 * Answer whether the chunk is a valid IEND chunk.
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39 */
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40 override void validate(PngFileReadState readState, PngIhdrChunk headerChunk) {
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41 // An IEND chunk is invalid if no IHDR has been read.
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42 // Or if a palette is required and has not been read.
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43 // Or if no IDAT chunk has been read.
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44 if (!readState.readIHDR
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45 || (headerChunk.getMustHavePalette() && !readState.readPLTE)
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46 || !readState.readIDAT
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47 || readState.readIEND)
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48 {
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49 DWT.error(DWT.ERROR_INVALID_IMAGE);
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50 } else {
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51 readState.readIEND = true;
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52 }
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54 super.validate(readState, headerChunk);
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56 // IEND chunks are not allowed to have any data.
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57 if (getLength() > 0) DWT.error(DWT.ERROR_INVALID_IMAGE);
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58 }
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60 }