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annotate dwt/internal/image/PngChunk.d @ 212:ab60f3309436

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reverted the char[] to String and use the an alias.
author Frank Benoit <benoit@tionex.de>
date Mon, 05 May 2008 00:12:38 +0200
parents 1801ddeb8f32
children 36f5cb12e1a2
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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;
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27 import dwt.dwthelper.System;
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28 import dwt.dwthelper.utils;
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29
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30 class PngChunk {
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31 byte[] reference;
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32
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33 static const int LENGTH_OFFSET = 0;
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34 static const int TYPE_OFFSET = 4;
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35 static const int DATA_OFFSET = 8;
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36
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37 static const int TYPE_FIELD_LENGTH = 4;
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38 static const int LENGTH_FIELD_LENGTH = 4;
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39 static const int MIN_LENGTH = 12;
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40
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41 static const int CHUNK_UNKNOWN = -1;
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42 // Critical chunks.
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43 static const int CHUNK_IHDR = 0;
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44 static const int CHUNK_PLTE = 1;
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45 static const int CHUNK_IDAT = 2;
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46 static const int CHUNK_IEND = 3;
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47 // Non-critical chunks.
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48 static const int CHUNK_tRNS = 5;
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49
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50 static const byte[] TYPE_IHDR = cast(byte[])"IHDR";//{(byte) 'I', (byte) 'H', (byte) 'D', (byte) 'R'};
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51 static const byte[] TYPE_PLTE = cast(byte[])"PLTE";//{(byte) 'P', (byte) 'L', (byte) 'T', (byte) 'E'};
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52 static const byte[] TYPE_IDAT = cast(byte[])"IDAT";//{(byte) 'I', (byte) 'D', (byte) 'A', (byte) 'T'};
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53 static const byte[] TYPE_IEND = cast(byte[])"IEND";//{(byte) 'I', (byte) 'E', (byte) 'N', (byte) 'D'};
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54 static const byte[] TYPE_tRNS = cast(byte[])"tRNS";//{(byte) 't', (byte) 'R', (byte) 'N', (byte) 'S'};
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55
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56 private static /+const+/ int[] CRC_TABLE;
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57 private static bool static_this_completed = false;
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58 private static void static_this() {
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59 if( static_this_completed ){
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60 return;
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61 }
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62 synchronized {
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63 if( static_this_completed ){
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64 return;
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65 }
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66 CRC_TABLE = new int[256];
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67 for (int i = 0; i < 256; i++) {
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68 CRC_TABLE[i] = i;
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69 for (int j = 0; j < 8; j++) {
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70 if ((CRC_TABLE[i] & 0x1) is 0) {
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71 CRC_TABLE[i] = (CRC_TABLE[i] >> 1) & 0x7FFFFFFF;
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72 } else {
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73 CRC_TABLE[i] = 0xEDB88320 ^ ((CRC_TABLE[i] >> 1) & 0x7FFFFFFF);
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74 }
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75 }
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76 }
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77 static_this_completed = true;
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78 }
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79 }
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81 int length;
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82
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83 /**
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84 * Construct a PngChunk using the reference bytes
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85 * given.
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86 */
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87 this(byte[] reference) {
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88 static_this();
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89 setReference(reference);
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90 if (reference.length < LENGTH_OFFSET + LENGTH_FIELD_LENGTH) DWT.error(DWT.ERROR_INVALID_IMAGE);
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91 length = getInt32(LENGTH_OFFSET);
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92 }
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93
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94 /**
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95 * Construct a PngChunk with the specified number of
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96 * data bytes.
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97 */
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98 this(int dataLength) {
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99 this(new byte[MIN_LENGTH + dataLength]);
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100 setLength(dataLength);
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101 }
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102
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103 /**
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104 * Get the PngChunk's reference byteArray;
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105 */
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106 byte[] getReference() {
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107 return reference;
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108 }
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109
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110 /**
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111 * Set the PngChunk's reference byteArray;
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112 */
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113 void setReference(byte[] reference) {
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114 this.reference = reference;
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115 }
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116
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117 /**
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118 * Get the 16-bit integer from the reference byte
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119 * array at the given offset.
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120 */
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121 int getInt16(int offset) {
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122 int answer = 0;
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123 answer |= (reference[offset] & 0xFF) << 8;
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124 answer |= (reference[offset + 1] & 0xFF);
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125 return answer;
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126 }
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127
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128 /**
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129 * Set the 16-bit integer in the reference byte
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130 * array at the given offset.
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131 */
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132 void setInt16(int offset, int value) {
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133 reference[offset] = cast(byte) ((value >> 8) & 0xFF);
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134 reference[offset + 1] = cast(byte) (value & 0xFF);
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135 }
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136
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137 /**
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138 * Get the 32-bit integer from the reference byte
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139 * array at the given offset.
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140 */
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141 int getInt32(int offset) {
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142 int answer = 0;
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143 answer |= (reference[offset] & 0xFF) << 24;
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144 answer |= (reference[offset + 1] & 0xFF) << 16;
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145 answer |= (reference[offset + 2] & 0xFF) << 8;
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146 answer |= (reference[offset + 3] & 0xFF);
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147 return answer;
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148 }
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149
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150 /**
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151 * Set the 32-bit integer in the reference byte
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152 * array at the given offset.
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153 */
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154 void setInt32(int offset, int value) {
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155 reference[offset] = cast(byte) ((value >> 24) & 0xFF);
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156 reference[offset + 1] = cast(byte) ((value >> 16) & 0xFF);
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157 reference[offset + 2] = cast(byte) ((value >> 8) & 0xFF);
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158 reference[offset + 3] = cast(byte) (value & 0xFF);
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159 }
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160
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161 /**
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162 * Get the length of the data component of this chunk.
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163 * This is not the length of the entire chunk.
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164 */
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165 int getLength() {
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166 return length;
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167 }
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168
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169 /**
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170 * Set the length of the data component of this chunk.
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171 * This is not the length of the entire chunk.
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172 */
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173 void setLength(int value) {
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174 setInt32(LENGTH_OFFSET, value);
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175 length = value;
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176 }
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177
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178 /**
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179 * Get the chunk type. This is a four byte value.
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180 * Each byte should be an ASCII character.
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181 * The first byte is upper case if the chunk is critical.
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182 * The second byte is upper case if the chunk is publicly defined.
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183 * The third byte must be upper case.
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184 * The fourth byte is upper case if the chunk is unsafe to copy.
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185 * Public chunk types are defined by the PNG Development Group.
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186 */
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187 byte[] getTypeBytes() {
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188 byte[] type = new byte[4];
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189 System.arraycopy(reference, TYPE_OFFSET, type, 0, TYPE_FIELD_LENGTH);
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190 return type;
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191 }
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192
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193 /**
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194 * Set the chunk type. This is a four byte value.
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195 * Each byte should be an ASCII character.
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196 * The first byte is upper case if the chunk is critical.
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197 * The second byte is upper case if the chunk is publicly defined.
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198 * The third byte must be upper case.
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199 * The fourth byte is upper case if the chunk is unsafe to copy.
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200 * Public chunk types are defined by the PNG Development Group.
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201 */
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202 void setType(byte[] value) {
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203 if (value.length !is TYPE_FIELD_LENGTH) {
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204 DWT.error (DWT.ERROR_INVALID_ARGUMENT);
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205 }
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206 System.arraycopy(value, 0, reference, TYPE_OFFSET, TYPE_FIELD_LENGTH);
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207 }
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208
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209 /**
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210 * Get the chunk's data.
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211 */
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212 byte[] getData() {
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213 int dataLength = getLength();
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214 if (reference.length < MIN_LENGTH + dataLength) {
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215 DWT.error (DWT.ERROR_INVALID_RANGE);
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216 }
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217 byte[] data = new byte[dataLength];
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218 System.arraycopy(reference, DATA_OFFSET, data, 0, dataLength);
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219 return data;
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220 }
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221
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222 /**
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223 * Set the chunk's data.
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224 * This method has two side-effects.
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225 * 1. It will set the length field to be the length
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226 * of the data array given.
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227 * 2. It will set the CRC field to the computed CRC
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228 * value of the data array given.
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229 */
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230 void setData(byte[] data) {
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231 setLength(data.length);
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232 System.arraycopy(data, 0, reference, DATA_OFFSET, data.length);
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233 setCRC(computeCRC());
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234 }
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235
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236 /**
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237 * Get the CRC value for the chunk's data.
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238 * Ensure that the length field has a good
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239 * value before making this call.
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240 */
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241 int getCRC() {
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242 int crcOffset = DATA_OFFSET + getLength();
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243 return getInt32(crcOffset);
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244 }
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245
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246 /**
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247 * Set the CRC value for the chunk's data.
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248 * Ensure that the length field has a good
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249 * value before making this call.
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250 */
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251 void setCRC(int value) {
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252 int crcOffset = DATA_OFFSET + getLength();
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253 setInt32(crcOffset, value);
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254 }
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255
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256 /**
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257 * Get the chunk's total size including the length, type, and crc fields.
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258 */
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259 int getSize() {
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diff changeset
260 return MIN_LENGTH + getLength();
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261 }
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262
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263 /**
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diff changeset
264 * Compute the CRC value for the chunk's data. Answer
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265 * whether this value matches the value stored in the
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266 * chunk.
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267 */
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268 bool checkCRC() {
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diff changeset
269 int crc = computeCRC();
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270 int storedCRC = getCRC();
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271 return crc is storedCRC;
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272 }
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273
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diff changeset
274 /**
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diff changeset
275 * Answer the CRC value of chunk's data.
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diff changeset
276 */
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277 int computeCRC() {
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278 int crc = 0xFFFFFFFF;
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279 int start = TYPE_OFFSET;
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280 int stop = DATA_OFFSET + getLength();
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281 for (int i = start; i < stop; i++) {
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282 int index = (crc ^ reference[i]) & 0xFF;
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283 crc = CRC_TABLE[index] ^ ((crc >> 8) & 0x00FFFFFF);
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diff changeset
284 }
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285 return ~crc;
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diff changeset
286 }
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287
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diff changeset
288 bool typeMatchesArray(byte[] array) {
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diff changeset
289 for (int i = 0; i < TYPE_FIELD_LENGTH; i++) {
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diff changeset
290 if (reference[TYPE_OFFSET + i] !is array[i]){
57151e2793a2 More common modules from dwt-linux
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diff changeset
291 return false;
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292 }
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293 }
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diff changeset
294 return true;
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diff changeset
295 }
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diff changeset
296
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diff changeset
297 bool isCritical() {
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diff changeset
298 char c = cast(char) getTypeBytes()[0];
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diff changeset
299 return 'A' <= c && c <= 'Z';
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diff changeset
300 }
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diff changeset
301
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diff changeset
302 int getChunkType() {
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parents:
diff changeset
303 if (typeMatchesArray(TYPE_IHDR)) return CHUNK_IHDR;
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diff changeset
304 if (typeMatchesArray(TYPE_PLTE)) return CHUNK_PLTE;
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diff changeset
305 if (typeMatchesArray(TYPE_IDAT)) return CHUNK_IDAT;
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diff changeset
306 if (typeMatchesArray(TYPE_IEND)) return CHUNK_IEND;
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diff changeset
307 if (typeMatchesArray(TYPE_tRNS)) return CHUNK_tRNS;
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parents:
diff changeset
308 return CHUNK_UNKNOWN;
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diff changeset
309 }
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diff changeset
310
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diff changeset
311 /**
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parents:
diff changeset
312 * Read the next PNG chunk from the input stream given.
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diff changeset
313 * If unable to read a chunk, return null.
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parents:
diff changeset
314 */
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parents:
diff changeset
315 static PngChunk readNextFromStream(LEDataInputStream stream) {
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parents:
diff changeset
316 try {
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parents:
diff changeset
317 int headerLength = LENGTH_FIELD_LENGTH + TYPE_FIELD_LENGTH;
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diff changeset
318 byte[] headerBytes = new byte[headerLength];
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diff changeset
319 int result = stream.read(headerBytes, 0, headerLength);
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320 stream.unread(headerBytes);
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321 if (result !is headerLength) return null;
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322
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323 PngChunk tempChunk = new PngChunk(headerBytes);
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324
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325 int chunkLength = tempChunk.getSize();
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326 byte[] chunk = new byte[chunkLength];
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327
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328 result = stream.read(chunk, 0, chunkLength);
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329 if (result !is chunkLength) return null;
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330
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331 switch (tempChunk.getChunkType()) {
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332 case CHUNK_IHDR:
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333 return new PngIhdrChunk(chunk);
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334 case CHUNK_PLTE:
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335 return new PngPlteChunk(chunk);
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336 case CHUNK_IDAT:
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337 return new PngIdatChunk(chunk);
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338 case CHUNK_IEND:
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339 return new PngIendChunk(chunk);
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340 case CHUNK_tRNS:
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341 return new PngTrnsChunk(chunk);
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342 default:
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343 return new PngChunk(chunk);
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344 }
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345 } catch (IOException e) {
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346 return null;
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347 }
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348 }
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349
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350 /**
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351 * Answer whether the chunk is a valid PNG chunk.
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352 */
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353 void validate(PngFileReadState readState, PngIhdrChunk headerChunk) {
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354 if (reference.length < MIN_LENGTH) DWT.error(DWT.ERROR_INVALID_IMAGE);
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355
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356 byte[] type = getTypeBytes();
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357
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358 // The third character MUST be upper case.
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359 char c = cast(char) type[2];
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360 if (!('A' <= c && c <= 'Z')) DWT.error(DWT.ERROR_INVALID_IMAGE);
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361
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362 // All characters must be letters.
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363 for (int i = 0; i < TYPE_FIELD_LENGTH; i++) {
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364 c = cast(char) type[i];
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365 if (!(('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z'))) {
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366 DWT.error(DWT.ERROR_INVALID_IMAGE);
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367 }
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368 }
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369
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370 // The stored CRC must match the data's computed CRC.
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371 if (!checkCRC()) DWT.error(DWT.ERROR_INVALID_IMAGE);
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372 }
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373
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374 /**
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375 * Provided so that subclasses can override and add
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376 * data to the toString() call.
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377 */
212
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378 String contributeToString() {
2
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379 return "";
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380 }
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381
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382 /**
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383 * Returns a string containing a concise, human-readable
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384 * description of the receiver.
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385 *
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386 * @return a string representation of the event
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387 */
212
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388 override public String toString() {
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389 String buffer = Format( "{\n\tLength: {}\n\tType: {}{}\n\tCRC: {:X}\n}",
2
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390 getLength(),
212
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391 cast(String) getTypeBytes(),
2
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392 contributeToString(),
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393 getCRC());
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394 return buffer;
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395 }
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396
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397 }