Mercurial > projects > dwt-win
annotate dwt/internal/image/PngChunk.d @ 48:9a64a7781bab
Added override and alias, first chunk. Thanks torhu for doing this patch.
author | Frank Benoit <benoit@tionex.de> |
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date | Sun, 03 Feb 2008 01:14:54 +0100 |
parents | 92c102dd64a3 |
children | 1801ddeb8f32 |
rev | line source |
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1 /******************************************************************************* |
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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.PngChunk; |
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14 |
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15 |
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16 import dwt.DWT; |
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17 import dwt.internal.image.LEDataInputStream; |
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18 import dwt.internal.image.PngFileReadState; |
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19 import dwt.internal.image.PngIhdrChunk; |
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20 import dwt.internal.image.PngPlteChunk; |
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21 import dwt.internal.image.PngIdatChunk; |
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22 import dwt.internal.image.PngIendChunk; |
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23 import dwt.internal.image.PngTrnsChunk; |
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24 |
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25 import tango.core.Exception; |
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26 import tango.text.convert.Format; |
31
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27 import dwt.dwthelper.System; |
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28 |
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29 class PngChunk { |
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30 byte[] reference; |
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31 |
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32 static const int LENGTH_OFFSET = 0; |
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33 static const int TYPE_OFFSET = 4; |
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34 static const int DATA_OFFSET = 8; |
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35 |
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36 static const int TYPE_FIELD_LENGTH = 4; |
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37 static const int LENGTH_FIELD_LENGTH = 4; |
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38 static const int MIN_LENGTH = 12; |
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39 |
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40 static const int CHUNK_UNKNOWN = -1; |
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41 // Critical chunks. |
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42 static const int CHUNK_IHDR = 0; |
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43 static const int CHUNK_PLTE = 1; |
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44 static const int CHUNK_IDAT = 2; |
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45 static const int CHUNK_IEND = 3; |
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46 // Non-critical chunks. |
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47 static const int CHUNK_tRNS = 5; |
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48 |
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49 static const byte[] TYPE_IHDR = cast(byte[])"IHDR";//{(byte) 'I', (byte) 'H', (byte) 'D', (byte) 'R'}; |
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50 static const byte[] TYPE_PLTE = cast(byte[])"PLTE";//{(byte) 'P', (byte) 'L', (byte) 'T', (byte) 'E'}; |
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51 static const byte[] TYPE_IDAT = cast(byte[])"IDAT";//{(byte) 'I', (byte) 'D', (byte) 'A', (byte) 'T'}; |
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52 static const byte[] TYPE_IEND = cast(byte[])"IEND";//{(byte) 'I', (byte) 'E', (byte) 'N', (byte) 'D'}; |
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53 static const byte[] TYPE_tRNS = cast(byte[])"tRNS";//{(byte) 't', (byte) 'R', (byte) 'N', (byte) 'S'}; |
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54 |
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55 static const int[] CRC_TABLE; |
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56 //public static void static_this() { |
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57 static this() { |
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58 CRC_TABLE = new int[256]; |
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59 for (int i = 0; i < 256; i++) { |
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60 CRC_TABLE[i] = i; |
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61 for (int j = 0; j < 8; j++) { |
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62 if ((CRC_TABLE[i] & 0x1) is 0) { |
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63 CRC_TABLE[i] = (CRC_TABLE[i] >> 1) & 0x7FFFFFFF; |
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64 } else { |
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65 CRC_TABLE[i] = 0xEDB88320 ^ ((CRC_TABLE[i] >> 1) & 0x7FFFFFFF); |
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66 } |
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67 } |
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68 } |
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69 } |
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70 |
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71 int length; |
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72 |
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73 /** |
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74 * Construct a PngChunk using the reference bytes |
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75 * given. |
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76 */ |
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77 this(byte[] reference) { |
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78 setReference(reference); |
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79 if (reference.length < LENGTH_OFFSET + LENGTH_FIELD_LENGTH) DWT.error(DWT.ERROR_INVALID_IMAGE); |
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80 length = getInt32(LENGTH_OFFSET); |
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81 } |
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82 |
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83 /** |
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84 * Construct a PngChunk with the specified number of |
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85 * data bytes. |
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86 */ |
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87 this(int dataLength) { |
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88 this(new byte[MIN_LENGTH + dataLength]); |
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89 setLength(dataLength); |
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90 } |
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91 |
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92 /** |
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93 * Get the PngChunk's reference byteArray; |
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94 */ |
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95 byte[] getReference() { |
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96 return reference; |
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97 } |
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98 |
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99 /** |
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100 * Set the PngChunk's reference byteArray; |
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101 */ |
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102 void setReference(byte[] reference) { |
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103 this.reference = reference; |
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104 } |
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105 |
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106 /** |
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107 * Get the 16-bit integer from the reference byte |
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108 * array at the given offset. |
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109 */ |
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110 int getInt16(int offset) { |
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111 int answer = 0; |
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112 answer |= (reference[offset] & 0xFF) << 8; |
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113 answer |= (reference[offset + 1] & 0xFF); |
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114 return answer; |
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115 } |
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116 |
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117 /** |
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118 * Set the 16-bit integer in the reference byte |
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119 * array at the given offset. |
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120 */ |
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121 void setInt16(int offset, int value) { |
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122 reference[offset] = cast(byte) ((value >> 8) & 0xFF); |
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123 reference[offset + 1] = cast(byte) (value & 0xFF); |
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124 } |
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125 |
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126 /** |
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127 * Get the 32-bit integer from the reference byte |
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128 * array at the given offset. |
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129 */ |
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130 int getInt32(int offset) { |
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131 int answer = 0; |
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132 answer |= (reference[offset] & 0xFF) << 24; |
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133 answer |= (reference[offset + 1] & 0xFF) << 16; |
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134 answer |= (reference[offset + 2] & 0xFF) << 8; |
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135 answer |= (reference[offset + 3] & 0xFF); |
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136 return answer; |
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137 } |
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138 |
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139 /** |
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140 * Set the 32-bit integer in the reference byte |
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141 * array at the given offset. |
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142 */ |
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143 void setInt32(int offset, int value) { |
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144 reference[offset] = cast(byte) ((value >> 24) & 0xFF); |
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145 reference[offset + 1] = cast(byte) ((value >> 16) & 0xFF); |
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146 reference[offset + 2] = cast(byte) ((value >> 8) & 0xFF); |
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147 reference[offset + 3] = cast(byte) (value & 0xFF); |
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148 } |
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149 |
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150 /** |
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151 * Get the length of the data component of this chunk. |
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152 * This is not the length of the entire chunk. |
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153 */ |
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154 int getLength() { |
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155 return length; |
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156 } |
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157 |
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158 /** |
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159 * Set the length of the data component of this chunk. |
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160 * This is not the length of the entire chunk. |
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161 */ |
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162 void setLength(int value) { |
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163 setInt32(LENGTH_OFFSET, value); |
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164 length = value; |
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165 } |
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166 |
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167 /** |
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168 * Get the chunk type. This is a four byte value. |
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169 * Each byte should be an ASCII character. |
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170 * The first byte is upper case if the chunk is critical. |
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171 * The second byte is upper case if the chunk is publicly defined. |
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172 * The third byte must be upper case. |
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173 * The fourth byte is upper case if the chunk is unsafe to copy. |
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174 * Public chunk types are defined by the PNG Development Group. |
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175 */ |
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176 byte[] getTypeBytes() { |
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177 byte[] type = new byte[4]; |
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178 System.arraycopy(reference, TYPE_OFFSET, type, 0, TYPE_FIELD_LENGTH); |
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179 return type; |
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180 } |
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181 |
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182 /** |
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183 * Set the chunk type. This is a four byte value. |
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184 * Each byte should be an ASCII character. |
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185 * The first byte is upper case if the chunk is critical. |
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186 * The second byte is upper case if the chunk is publicly defined. |
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187 * The third byte must be upper case. |
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188 * The fourth byte is upper case if the chunk is unsafe to copy. |
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189 * Public chunk types are defined by the PNG Development Group. |
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190 */ |
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191 void setType(byte[] value) { |
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192 if (value.length !is TYPE_FIELD_LENGTH) { |
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193 DWT.error (DWT.ERROR_INVALID_ARGUMENT); |
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194 } |
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195 System.arraycopy(value, 0, reference, TYPE_OFFSET, TYPE_FIELD_LENGTH); |
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196 } |
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197 |
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198 /** |
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199 * Get the chunk's data. |
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200 */ |
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201 byte[] getData() { |
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202 int dataLength = getLength(); |
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203 if (reference.length < MIN_LENGTH + dataLength) { |
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204 DWT.error (DWT.ERROR_INVALID_RANGE); |
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205 } |
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206 byte[] data = new byte[dataLength]; |
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207 System.arraycopy(reference, DATA_OFFSET, data, 0, dataLength); |
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208 return data; |
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209 } |
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210 |
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211 /** |
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212 * Set the chunk's data. |
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213 * This method has two side-effects. |
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214 * 1. It will set the length field to be the length |
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215 * of the data array given. |
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216 * 2. It will set the CRC field to the computed CRC |
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217 * value of the data array given. |
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218 */ |
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219 void setData(byte[] data) { |
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220 setLength(data.length); |
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221 System.arraycopy(data, 0, reference, DATA_OFFSET, data.length); |
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222 setCRC(computeCRC()); |
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223 } |
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224 |
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225 /** |
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226 * Get the CRC value for the chunk's data. |
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227 * Ensure that the length field has a good |
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228 * value before making this call. |
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229 */ |
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230 int getCRC() { |
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231 int crcOffset = DATA_OFFSET + getLength(); |
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232 return getInt32(crcOffset); |
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233 } |
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234 |
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235 /** |
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236 * Set the CRC value for the chunk's data. |
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237 * Ensure that the length field has a good |
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238 * value before making this call. |
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239 */ |
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240 void setCRC(int value) { |
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241 int crcOffset = DATA_OFFSET + getLength(); |
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242 setInt32(crcOffset, value); |
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243 } |
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244 |
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245 /** |
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246 * Get the chunk's total size including the length, type, and crc fields. |
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247 */ |
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248 int getSize() { |
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249 return MIN_LENGTH + getLength(); |
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250 } |
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251 |
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252 /** |
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253 * Compute the CRC value for the chunk's data. Answer |
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254 * whether this value matches the value stored in the |
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255 * chunk. |
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256 */ |
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257 bool checkCRC() { |
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258 int crc = computeCRC(); |
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259 int storedCRC = getCRC(); |
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260 return crc is storedCRC; |
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261 } |
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262 |
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263 /** |
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264 * Answer the CRC value of chunk's data. |
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265 */ |
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266 int computeCRC() { |
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267 int crc = 0xFFFFFFFF; |
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268 int start = TYPE_OFFSET; |
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269 int stop = DATA_OFFSET + getLength(); |
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270 for (int i = start; i < stop; i++) { |
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271 int index = (crc ^ reference[i]) & 0xFF; |
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272 crc = CRC_TABLE[index] ^ ((crc >> 8) & 0x00FFFFFF); |
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273 } |
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274 return ~crc; |
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275 } |
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276 |
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277 bool typeMatchesArray(byte[] array) { |
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278 for (int i = 0; i < TYPE_FIELD_LENGTH; i++) { |
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279 if (reference[TYPE_OFFSET + i] !is array[i]){ |
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280 return false; |
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281 } |
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282 } |
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283 return true; |
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284 } |
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285 |
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286 bool isCritical() { |
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287 char c = cast(char) getTypeBytes()[0]; |
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288 return 'A' <= c && c <= 'Z'; |
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289 } |
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290 |
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291 int getChunkType() { |
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292 if (typeMatchesArray(TYPE_IHDR)) return CHUNK_IHDR; |
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293 if (typeMatchesArray(TYPE_PLTE)) return CHUNK_PLTE; |
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294 if (typeMatchesArray(TYPE_IDAT)) return CHUNK_IDAT; |
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295 if (typeMatchesArray(TYPE_IEND)) return CHUNK_IEND; |
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296 if (typeMatchesArray(TYPE_tRNS)) return CHUNK_tRNS; |
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297 return CHUNK_UNKNOWN; |
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298 } |
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299 |
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300 /** |
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301 * Read the next PNG chunk from the input stream given. |
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302 * If unable to read a chunk, return null. |
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303 */ |
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304 static PngChunk readNextFromStream(LEDataInputStream stream) { |
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305 try { |
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306 int headerLength = LENGTH_FIELD_LENGTH + TYPE_FIELD_LENGTH; |
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307 byte[] headerBytes = new byte[headerLength]; |
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308 int result = stream.read(headerBytes, 0, headerLength); |
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309 stream.unread(headerBytes); |
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310 if (result !is headerLength) return null; |
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311 |
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312 PngChunk tempChunk = new PngChunk(headerBytes); |
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313 |
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314 int chunkLength = tempChunk.getSize(); |
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315 byte[] chunk = new byte[chunkLength]; |
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316 |
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317 result = stream.read(chunk, 0, chunkLength); |
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318 if (result !is chunkLength) return null; |
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319 |
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320 switch (tempChunk.getChunkType()) { |
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321 case CHUNK_IHDR: |
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322 return new PngIhdrChunk(chunk); |
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323 case CHUNK_PLTE: |
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324 return new PngPlteChunk(chunk); |
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325 case CHUNK_IDAT: |
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326 return new PngIdatChunk(chunk); |
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327 case CHUNK_IEND: |
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328 return new PngIendChunk(chunk); |
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329 case CHUNK_tRNS: |
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330 return new PngTrnsChunk(chunk); |
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331 default: |
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332 return new PngChunk(chunk); |
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333 } |
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334 } catch (IOException e) { |
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335 return null; |
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336 } |
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337 } |
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338 |
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339 /** |
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340 * Answer whether the chunk is a valid PNG chunk. |
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341 */ |
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342 void validate(PngFileReadState readState, PngIhdrChunk headerChunk) { |
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343 if (reference.length < MIN_LENGTH) DWT.error(DWT.ERROR_INVALID_IMAGE); |
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344 |
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345 byte[] type = getTypeBytes(); |
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346 |
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347 // The third character MUST be upper case. |
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348 char c = cast(char) type[2]; |
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349 if (!('A' <= c && c <= 'Z')) DWT.error(DWT.ERROR_INVALID_IMAGE); |
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350 |
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351 // All characters must be letters. |
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352 for (int i = 0; i < TYPE_FIELD_LENGTH; i++) { |
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353 c = cast(char) type[i]; |
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354 if (!(('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z'))) { |
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355 DWT.error(DWT.ERROR_INVALID_IMAGE); |
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356 } |
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357 } |
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358 |
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359 // The stored CRC must match the data's computed CRC. |
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360 if (!checkCRC()) DWT.error(DWT.ERROR_INVALID_IMAGE); |
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361 } |
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362 |
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363 /** |
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364 * Provided so that subclasses can override and add |
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365 * data to the toString() call. |
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366 */ |
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367 char[] contributeToString() { |
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368 return ""; |
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369 } |
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370 |
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371 /** |
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372 * Returns a string containing a concise, human-readable |
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373 * description of the receiver. |
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374 * |
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375 * @return a string representation of the event |
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376 */ |
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377 override public char[] toString() { |
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378 char[] buffer = Format( "{\n\tLength: {}\n\tType: {}{}\n\tCRC: {:X}\n}", |
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379 getLength(), |
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380 cast(char[]) getTypeBytes(), |
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381 contributeToString(), |
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382 getCRC()); |
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383 return buffer; |
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384 } |
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385 |
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386 } |