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annotate dwt/internal/image/TIFFRandomFileAccess.d @ 6:b903c16b6f48

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Removed throws decls
author Frank Benoit <benoit@tionex.de>
date Wed, 27 Aug 2008 14:10:03 +0200
parents 1a8b3cb347e0
children 5123b17c98ef
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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 *******************************************************************************/
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11 module dwt.internal.image;
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12
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13 import java.io.IOException;
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14
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15 final class TIFFRandomFileAccess {
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16
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17 LEDataInputStream inputStream;
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18 int start, current, next;
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19 byte[][] buffers;
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20
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21 static final int CHUNK_SIZE = 8192;
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22 static final int LIST_SIZE = 128;
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23
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1a8b3cb347e0 Fix Ctors to 'this'
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24 public this(LEDataInputStream stream) {
0
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25 inputStream = stream;
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26 start = current = next = inputStream.getPosition();
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27 buffers = new byte[LIST_SIZE][];
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28 }
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30 void seek(int pos) {
0
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31 if (pos is current) return;
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32 if (pos < start) throw new IOException();
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33 current = pos;
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34 if (current > next) {
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35 int n = current - next;
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36 /* store required bytes */
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37 int index = next / CHUNK_SIZE;
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38 int offset = next % CHUNK_SIZE;
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39 while (n > 0) {
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40 if (index >= buffers.length) {
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41 byte[][] oldBuffers = buffers;
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42 buffers = new byte[Math.max(index + 1, oldBuffers.length + LIST_SIZE)][];
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43 System.arraycopy(oldBuffers, 0, buffers, 0, oldBuffers.length);
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44 }
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45 if (buffers[index] is null) buffers[index] = new byte[CHUNK_SIZE];
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46 int cnt = inputStream.read(buffers[index], offset, Math.min(n, CHUNK_SIZE - offset));
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47 n -= cnt;
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48 next += cnt;
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49 index++;
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50 offset = 0;
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51 }
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52 }
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53 }
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55 void read(byte b[]) {
0
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56 int size = b.length;
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57 int nCached = Math.min(size, next - current);
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58 int nMissing = size - next + current;
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59 int destNext = 0;
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60 if (nCached > 0) {
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61 /* Get cached bytes */
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62 int index = current / CHUNK_SIZE;
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63 int offset = current % CHUNK_SIZE;
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64 while (nCached > 0) {
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65 int cnt = Math.min(nCached, CHUNK_SIZE - offset);
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66 System.arraycopy(buffers[index], offset, b, destNext, cnt);
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67 nCached -= cnt;
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68 destNext += cnt;
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69 index++;
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70 offset = 0;
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71 }
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72 }
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73 if (nMissing > 0) {
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74 /* Read required bytes */
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75 int index = next / CHUNK_SIZE;
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76 int offset = next % CHUNK_SIZE;
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77 while (nMissing > 0) {
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78 if (index >= buffers.length) {
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79 byte[][] oldBuffers = buffers;
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80 buffers = new byte[Math.max(index, oldBuffers.length + LIST_SIZE)][];
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81 System.arraycopy(oldBuffers, 0, buffers, 0, oldBuffers.length);
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82 }
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83 if (buffers[index] is null) buffers[index] = new byte[CHUNK_SIZE];
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84 int cnt = inputStream.read(buffers[index], offset, Math.min(nMissing, CHUNK_SIZE - offset));
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85 System.arraycopy(buffers[index], offset, b, destNext, cnt);
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86 nMissing -= cnt;
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87 next += cnt;
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88 destNext += cnt;
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89 index++;
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90 offset = 0;
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91 }
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92 }
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93 current += size;
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94 }
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95
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96 }