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annotate dwt/internal/image/PngIendChunk.d @ 0:380af2bdd8e5

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Upload of whole dwt tree
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Sat, 09 Aug 2008 17:00:02 +0200
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children 1a8b3cb347e0
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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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 *******************************************************************************/
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11 module dwt.internal.image;
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14 import dwt.DWT;
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15
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16 class PngIendChunk : PngChunk {
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17
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18 PngIendChunk() {
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19 super(0);
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20 setType(TYPE_IEND);
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21 setCRC(computeCRC());
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22 }
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24 PngIendChunk(byte[] reference){
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25 super(reference);
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26 }
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28 int getChunkType() {
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29 return CHUNK_IEND;
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30 }
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31
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32 /**
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33 * Answer whether the chunk is a valid IEND chunk.
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34 */
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35 void validate(PngFileReadState readState, PngIhdrChunk headerChunk) {
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36 // An IEND chunk is invalid if no IHDR has been read.
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37 // Or if a palette is required and has not been read.
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38 // Or if no IDAT chunk has been read.
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39 if (!readState.readIHDR
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40 || (headerChunk.getMustHavePalette() && !readState.readPLTE)
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41 || !readState.readIDAT
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42 || readState.readIEND)
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43 {
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44 DWT.error(DWT.ERROR_INVALID_IMAGE);
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45 } else {
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46 readState.readIEND = true;
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47 }
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48
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49 super.validate(readState, headerChunk);
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50
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51 // IEND chunks are not allowed to have any data.
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52 if (getLength() > 0) DWT.error(DWT.ERROR_INVALID_IMAGE);
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53 }
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54
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55 }