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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2005 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.TIFFFileFormat;
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12
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13 import dwt.internal.image.TIFFRandomFileAccess;
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14 import dwt.internal.image.TIFFDirectory;
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15 import dwt.SWT;
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16 import dwt.graphics.ImageData;
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17 import dwt.graphics.ImageLoader;
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18 import dwt.internal.image.FileFormat;
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19
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20 import tango.core.Exception;
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21
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22 /**
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23 * Baseline TIFF decoder revision 6.0
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24 * Extension T4-encoding CCITT T.4 1D
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25 */
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26 final class TIFFFileFormat : FileFormat {
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27
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28 bool isFileFormat(LEDataInputStream stream) {
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29 try {
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30 byte[] header = new byte[4];
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31 stream.read(header);
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32 stream.unread(header);
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33 if (header[0] != header[1]) return false;
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34 if (!(header[0] == 0x49 && header[2] == 42 && header[3] == 0) &&
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35 !(header[0] == 0x4d && header[2] == 0 && header[3] == 42)) {
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36 return false;
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37 }
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38 return true;
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39 } catch (TracedException e) {
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40 return false;
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41 }
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42 }
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43
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44 ImageData[] loadFromByteStream() {
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45 byte[] header = new byte[8];
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46 bool isLittleEndian;
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47 ImageData[] images = new ImageData[0];
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48 TIFFRandomFileAccess file = new TIFFRandomFileAccess(inputStream);
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49 try {
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50 file.read(header);
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51 if (header[0] != header[1]) SWT.error(SWT.ERROR_INVALID_IMAGE);
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52 if (!(header[0] == 0x49 && header[2] == 42 && header[3] == 0) &&
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53 !(header[0] == 0x4d && header[2] == 0 && header[3] == 42)) {
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54 SWT.error(SWT.ERROR_INVALID_IMAGE);
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55 }
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56 isLittleEndian = header[0] == 0x49;
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57 int offset = isLittleEndian ?
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58 (header[4] & 0xFF) | ((header[5] & 0xFF) << 8) | ((header[6] & 0xFF) << 16) | ((header[7] & 0xFF) << 24) :
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59 (header[7] & 0xFF) | ((header[6] & 0xFF) << 8) | ((header[5] & 0xFF) << 16) | ((header[4] & 0xFF) << 24);
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60 file.seek(offset);
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61 TIFFDirectory directory = new TIFFDirectory(file, isLittleEndian, loader);
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62 ImageData image = directory.read();
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63 /* A baseline reader is only expected to read the first directory */
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64 images = [image];
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65 } catch (IOException e) {
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66 SWT.error(SWT.ERROR_IO, e);
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67 }
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68 return images;
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69 }
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70
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71 void unloadIntoByteStream(ImageLoader loader) {
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72 /* We do not currently support writing multi-page tiff,
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73 * so we use the first image data in the loader's array. */
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74 ImageData image = loader.data[0];
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75 TIFFDirectory directory = new TIFFDirectory(image);
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76 try {
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77 directory.writeToStream(outputStream);
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78 } catch (IOException e) {
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79 SWT.error(SWT.ERROR_IO, e);
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80 }
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81 }
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82
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83 }
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