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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2008 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 org.eclipse.swt.internal.image.TIFFFileFormat;
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14
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15 import java.lang.all;
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16
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17 import org.eclipse.swt.internal.image.TIFFRandomFileAccess;
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18 import org.eclipse.swt.internal.image.TIFFDirectory;
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19 import org.eclipse.swt.SWT;
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20 import org.eclipse.swt.graphics.ImageData;
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21 import org.eclipse.swt.graphics.ImageLoader;
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22 import org.eclipse.swt.internal.image.FileFormat;
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23
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24
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25 /**
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26 * Baseline TIFF decoder revision 6.0
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27 * Extension T4-encoding CCITT T.4 1D
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28 */
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29 final class TIFFFileFormat : FileFormat {
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30
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31 override bool isFileFormat(LEDataInputStream stream) {
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32 try {
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33 byte[] header = new byte[4];
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34 stream.read(header);
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35 stream.unread(header);
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36 if (header[0] !is header[1]) return false;
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37 if (!(header[0] is 0x49 && header[2] is 42 && header[3] is 0) &&
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38 !(header[0] is 0x4d && header[2] is 0 && header[3] is 42)) {
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39 return false;
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40 }
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41 return true;
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42 } catch (Exception e) {
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43 return false;
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44 }
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45 }
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46
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47 override ImageData[] loadFromByteStream() {
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48 byte[] header = new byte[8];
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49 bool isLittleEndian;
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50 ImageData[] images = new ImageData[0];
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51 TIFFRandomFileAccess file = new TIFFRandomFileAccess(inputStream);
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52 try {
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53 file.read(header);
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54 if (header[0] !is header[1]) SWT.error(SWT.ERROR_INVALID_IMAGE);
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55 if (!(header[0] is 0x49 && header[2] is 42 && header[3] is 0) &&
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56 !(header[0] is 0x4d && header[2] is 0 && header[3] is 42)) {
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57 SWT.error(SWT.ERROR_INVALID_IMAGE);
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58 }
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59 isLittleEndian = header[0] is 0x49;
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60 int offset = isLittleEndian ?
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61 (header[4] & 0xFF) | ((header[5] & 0xFF) << 8) | ((header[6] & 0xFF) << 16) | ((header[7] & 0xFF) << 24) :
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62 (header[7] & 0xFF) | ((header[6] & 0xFF) << 8) | ((header[5] & 0xFF) << 16) | ((header[4] & 0xFF) << 24);
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63 file.seek(offset);
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64 TIFFDirectory directory = new TIFFDirectory(file, isLittleEndian, loader);
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65 ImageData image = directory.read();
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66 /* A baseline reader is only expected to read the first directory */
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67 images = [image];
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68 } catch (IOException e) {
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69 SWT.error(SWT.ERROR_IO, e);
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70 }
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71 return images;
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72 }
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73
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74 override void unloadIntoByteStream(ImageLoader loader) {
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75 /* We do not currently support writing multi-page tiff,
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76 * so we use the first image data in the loader's array. */
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77 ImageData image = loader.data[0];
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78 TIFFDirectory directory = new TIFFDirectory(image);
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79 try {
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80 directory.writeToStream(outputStream);
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81 } catch (IOException e) {
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82 SWT.error(SWT.ERROR_IO, e);
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83 }
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84 }
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85
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86 }
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