Mercurial > projects > dwt-mac
annotate dwt/internal/image/PngLzBlockReader.d @ 156:969e7de37c3d default tip
Fixes to get dwt to work with dmd and ldc
author | Jacob Carlborg <doob@me.com> |
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date | Wed, 08 Jul 2009 21:56:44 +0200 |
parents | 5123b17c98ef |
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rev | line source |
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34
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Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
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1 /******************************************************************************* |
0
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2 * Copyright (c) 2000, 2006 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.PngLzBlockReader; |
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14 |
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15 import dwt.internal.image.PngDecodingDataStream; |
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16 import dwt.internal.image.PngHuffmanTables; |
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17 |
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18 public class PngLzBlockReader { |
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19 bool isLastBlock; |
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20 byte compressionType; |
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21 int uncompressedBytesRemaining; |
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22 PngDecodingDataStream stream; |
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23 PngHuffmanTables huffmanTables; |
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24 |
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25 byte[] window; |
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26 int windowIndex; |
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27 int copyIndex; |
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28 int copyBytesRemaining; |
34
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29 |
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30 static const int UNCOMPRESSED = 0; |
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31 static const int COMPRESSED_FIXED = 1; |
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32 static const int COMPRESSED_DYNAMIC = 2; |
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33 |
34
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34 static const int END_OF_COMPRESSED_BLOCK = 256; |
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35 static const int FIRST_LENGTH_CODE = 257; |
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36 static const int LAST_LENGTH_CODE = 285; |
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37 static const int FIRST_DISTANCE_CODE = 1; |
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38 static const int LAST_DISTANCE_CODE = 29; |
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39 static const int FIRST_CODE_LENGTH_CODE = 4; |
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40 static const int LAST_CODE_LENGTH_CODE = 19; |
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41 |
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42 static const int[] lengthBases = [ |
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43 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, |
0
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44 31, 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258 |
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45 ]; |
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46 static const int[] extraLengthBits = [ |
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47 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, |
0
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48 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, |
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49 ]; |
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50 static const int[] distanceBases = [ |
0
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51 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, |
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52 193, 257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, |
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53 6145, 8193, 12289, 16385, 24577, |
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54 ]; |
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55 static const int[] extraDistanceBits = [ |
0
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56 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, |
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57 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, |
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58 ]; |
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59 |
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60 |
5 | 61 this(PngDecodingDataStream stream) { |
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62 this.stream = stream; |
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63 isLastBlock = false; |
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64 } |
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65 |
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66 void setWindowSize(int windowSize) { |
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67 window = new byte[windowSize]; |
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68 } |
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69 |
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70 void readNextBlockHeader() { |
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71 isLastBlock = stream.getNextIdatBit() !is 0; |
7 | 72 compressionType = cast(byte)(stream.getNextIdatBits(2) & 0xFF); |
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73 if (compressionType > 2) stream.error(); |
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74 |
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75 if (compressionType is UNCOMPRESSED) { |
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76 byte b1 = stream.getNextIdatByte(); |
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77 byte b2 = stream.getNextIdatByte(); |
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78 byte b3 = stream.getNextIdatByte(); |
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79 byte b4 = stream.getNextIdatByte(); |
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80 if (b1 !is ~b3 || b2 !is ~b4) stream.error(); |
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81 uncompressedBytesRemaining = (b1 & 0xFF) | ((b2 & 0xFF) << 8); |
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82 } else if (compressionType is COMPRESSED_DYNAMIC) { |
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83 huffmanTables = PngHuffmanTables.getDynamicTables(stream); |
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84 } else { |
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85 huffmanTables = PngHuffmanTables.getFixedTables(); |
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86 } |
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87 } |
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88 |
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89 byte getNextByte() { |
0
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90 if (compressionType is UNCOMPRESSED) { |
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91 if (uncompressedBytesRemaining is 0) { |
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92 readNextBlockHeader(); |
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93 return getNextByte(); |
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94 } |
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95 uncompressedBytesRemaining--; |
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96 return stream.getNextIdatByte(); |
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97 } else { |
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98 byte value = getNextCompressedByte(); |
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99 if (value is END_OF_COMPRESSED_BLOCK) { |
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100 if (isLastBlock) stream.error(); |
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101 readNextBlockHeader(); |
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102 return getNextByte(); |
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103 } else { |
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104 return value; |
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105 } |
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106 } |
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107 } |
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108 |
34
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Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
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109 private void assertBlockAtEnd() { |
0
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110 if (compressionType is UNCOMPRESSED) { |
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111 if (uncompressedBytesRemaining > 0) stream.error(); |
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112 } else if (copyBytesRemaining > 0 || |
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113 (huffmanTables.getNextLiteralValue(stream) !is END_OF_COMPRESSED_BLOCK)) |
0
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114 { |
34
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115 stream.error(); |
0
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116 } |
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117 } |
34
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118 void assertCompressedDataAtEnd() { |
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119 assertBlockAtEnd(); |
0
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120 while (!isLastBlock) { |
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121 readNextBlockHeader(); |
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122 assertBlockAtEnd(); |
34
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123 } |
0
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124 } |
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125 |
34
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126 private byte getNextCompressedByte() { |
0
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127 if (copyBytesRemaining > 0) { |
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128 byte value = window[copyIndex]; |
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129 window[windowIndex] = value; |
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130 copyBytesRemaining--; |
34
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131 |
0
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132 copyIndex++; |
34
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133 windowIndex++; |
0
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134 if (copyIndex is window.length) copyIndex = 0; |
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135 if (windowIndex is window.length) windowIndex = 0; |
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136 |
34
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137 return value; |
0
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138 } |
34
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139 |
0
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140 int value = huffmanTables.getNextLiteralValue(stream); |
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141 if (value < END_OF_COMPRESSED_BLOCK) { |
7 | 142 window[windowIndex] = cast(byte) (value & 0xFF); |
0
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143 windowIndex++; |
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144 if (windowIndex >= window.length) windowIndex = 0; |
34
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145 return cast(byte) (value & 0xFF); |
0
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146 } else if (value is END_OF_COMPRESSED_BLOCK) { |
380af2bdd8e5
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147 readNextBlockHeader(); |
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148 return getNextByte(); |
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149 } else if (value <= LAST_LENGTH_CODE) { |
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150 int extraBits = extraLengthBits[value - FIRST_LENGTH_CODE]; |
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151 int length = lengthBases[value - FIRST_LENGTH_CODE]; |
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152 if (extraBits > 0) { |
380af2bdd8e5
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153 length += stream.getNextIdatBits(extraBits); |
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154 } |
34
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Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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155 |
0
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156 value = huffmanTables.getNextDistanceValue(stream); |
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157 if (value > LAST_DISTANCE_CODE) stream.error(); |
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158 extraBits = extraDistanceBits[value]; |
380af2bdd8e5
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159 int distance = distanceBases[value]; |
380af2bdd8e5
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160 if (extraBits > 0) { |
380af2bdd8e5
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161 distance += stream.getNextIdatBits(extraBits); |
380af2bdd8e5
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162 } |
34
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Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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|
163 |
0
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164 copyIndex = windowIndex - distance; |
380af2bdd8e5
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165 if (copyIndex < 0) copyIndex += window.length; |
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166 |
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167 copyBytesRemaining = length; |
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168 return getNextCompressedByte(); |
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169 } else { |
380af2bdd8e5
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170 stream.error(); |
380af2bdd8e5
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171 return 0; |
380af2bdd8e5
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172 } |
380af2bdd8e5
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parents:
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changeset
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173 } |
34
5123b17c98ef
Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
7
diff
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|
174 |
0
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175 } |