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annotate dwt/internal/image/TIFFRandomFileAccess.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 b903c16b6f48
children
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1 /*******************************************************************************
0
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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 dwt.internal.image.TIFFRandomFileAccess;
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14
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15 import dwt.internal.image.LEDataInputStream;
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16 import Math = tango.math.Math;
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17 import tango.core.Exception;
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18 import dwt.dwthelper.System;
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19
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20 final class TIFFRandomFileAccess {
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21
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22 LEDataInputStream inputStream;
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23 int start, current, next;
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24 byte[][] buffers;
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25
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26 static final int CHUNK_SIZE = 8192;
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27 static final int LIST_SIZE = 128;
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29 public this(LEDataInputStream stream) {
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30 inputStream = stream;
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31 start = current = next = inputStream.getPosition();
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32 buffers = new byte[][](LIST_SIZE);
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33 }
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35 void seek(int pos) {
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36 if (pos is current) return;
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37 if (pos < start) throw new IOException( "pos < start" );
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38 current = pos;
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39 if (current > next) {
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40 int n = current - next;
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41 /* store required bytes */
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42 int index = next / CHUNK_SIZE;
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43 int offset = next % CHUNK_SIZE;
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44 while (n > 0) {
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45 if (index >= buffers.length) {
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46 byte[][] oldBuffers = buffers;
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47 buffers = new byte[][]( Math.max(index + 1, oldBuffers.length + LIST_SIZE) );
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48 System.arraycopy(oldBuffers, 0, buffers, 0, oldBuffers.length);
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49 }
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50 if (buffers[index] is null) buffers[index] = new byte[CHUNK_SIZE];
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51 int cnt = inputStream.read(buffers[index], offset, Math.min(n, CHUNK_SIZE - offset));
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52 n -= cnt;
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53 next += cnt;
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54 index++;
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55 offset = 0;
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56 }
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57 }
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58 }
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59
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60 void read(byte b[]) {
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61 int size = b.length;
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62 int nCached = Math.min(size, next - current);
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63 int nMissing = size - next + current;
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64 int destNext = 0;
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65 if (nCached > 0) {
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66 /* Get cached bytes */
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67 int index = current / CHUNK_SIZE;
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68 int offset = current % CHUNK_SIZE;
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69 while (nCached > 0) {
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70 int cnt = Math.min(nCached, CHUNK_SIZE - offset);
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71 System.arraycopy(buffers[index], offset, b, destNext, cnt);
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72 nCached -= cnt;
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73 destNext += cnt;
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74 index++;
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75 offset = 0;
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76 }
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77 }
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78 if (nMissing > 0) {
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79 /* Read required bytes */
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80 int index = next / CHUNK_SIZE;
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81 int offset = next % CHUNK_SIZE;
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82 while (nMissing > 0) {
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83 if (index >= buffers.length) {
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84 byte[][] oldBuffers = buffers;
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85 buffers = new byte[][](Math.max(index, oldBuffers.length + LIST_SIZE));
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86 System.arraycopy(oldBuffers, 0, buffers, 0, oldBuffers.length);
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87 }
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88 if (buffers[index] is null) buffers[index] = new byte[CHUNK_SIZE];
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89 int cnt = inputStream.read(buffers[index], offset, Math.min(nMissing, CHUNK_SIZE - offset));
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90 System.arraycopy(buffers[index], offset, b, destNext, cnt);
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91 nMissing -= cnt;
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92 next += cnt;
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93 destNext += cnt;
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94 index++;
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95 offset = 0;
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96 }
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97 }
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98 current += size;
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99 }
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100
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101 }