Mercurial > projects > dwt2
annotate org.eclipse.swt.win32.win32.x86/src/org/eclipse/swt/internal/image/TIFFRandomFileAccess.d @ 36:d46287db17ed
rakefile reorg, swt win phobosification
author | Frank Benoit <benoit@tionex.de> |
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date | Tue, 24 Mar 2009 08:48:41 +0100 |
parents | f36c67707cb3 |
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1 /******************************************************************************* |
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2 * Copyright (c) 2000, 2003 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.TIFFRandomFileAccess; |
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14 |
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15 import org.eclipse.swt.internal.image.LEDataInputStream; |
4 | 16 import java.lang.all; |
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17 |
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18 final class TIFFRandomFileAccess { |
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19 |
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20 LEDataInputStream inputStream; |
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21 int start, current, next; |
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22 byte[][] buffers; |
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23 |
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24 static const int CHUNK_SIZE = 8192; |
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25 static const int LIST_SIZE = 128; |
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26 |
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27 public this(LEDataInputStream stream) { |
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28 inputStream = stream; |
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29 start = current = next = inputStream.getPosition(); |
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30 buffers = new byte[][](LIST_SIZE); |
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31 } |
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32 |
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33 void seek(int pos) { |
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34 if (pos is current) return; |
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35 if (pos < start) throw new IOException( "pos < start" ); |
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36 current = pos; |
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37 if (current > next) { |
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38 int n = current - next; |
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39 /* store required bytes */ |
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40 int index = next / CHUNK_SIZE; |
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41 int offset = next % CHUNK_SIZE; |
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42 while (n > 0) { |
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43 if (index >= buffers.length) { |
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44 byte[][] oldBuffers = buffers; |
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45 buffers = new byte[][]( Math.max(index + 1, oldBuffers.length + LIST_SIZE) ); |
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46 System.arraycopy(oldBuffers, 0, buffers, 0, oldBuffers.length); |
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47 } |
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48 if (buffers[index] is null) buffers[index] = new byte[CHUNK_SIZE]; |
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49 int cnt = inputStream.read(buffers[index], offset, Math.min(n, CHUNK_SIZE - offset)); |
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50 n -= cnt; |
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51 next += cnt; |
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52 index++; |
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53 offset = 0; |
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54 } |
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55 } |
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56 } |
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57 |
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58 void read(byte b[]) { |
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59 int size = b.length; |
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60 int nCached = Math.min(size, next - current); |
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61 int nMissing = size - next + current; |
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62 int destNext = 0; |
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63 if (nCached > 0) { |
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64 /* Get cached bytes */ |
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65 int index = current / CHUNK_SIZE; |
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66 int offset = current % CHUNK_SIZE; |
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67 while (nCached > 0) { |
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68 int cnt = Math.min(nCached, CHUNK_SIZE - offset); |
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69 System.arraycopy(buffers[index], offset, b, destNext, cnt); |
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70 nCached -= cnt; |
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71 destNext += cnt; |
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72 index++; |
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73 offset = 0; |
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74 } |
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75 } |
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76 if (nMissing > 0) { |
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77 /* Read required bytes */ |
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78 int index = next / CHUNK_SIZE; |
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79 int offset = next % CHUNK_SIZE; |
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80 while (nMissing > 0) { |
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81 if (index >= buffers.length) { |
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82 byte[][] oldBuffers = buffers; |
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83 buffers = new byte[][](Math.max(index, oldBuffers.length + LIST_SIZE)); |
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84 System.arraycopy(oldBuffers, 0, buffers, 0, oldBuffers.length); |
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85 } |
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86 if (buffers[index] is null) buffers[index] = new byte[CHUNK_SIZE]; |
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87 int cnt = inputStream.read(buffers[index], offset, Math.min(nMissing, CHUNK_SIZE - offset)); |
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88 System.arraycopy(buffers[index], offset, b, destNext, cnt); |
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89 nMissing -= cnt; |
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90 next += cnt; |
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91 destNext += cnt; |
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92 index++; |
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93 offset = 0; |
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94 } |
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95 } |
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96 current += size; |
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97 } |
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98 |
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99 } |