Mercurial > projects > dwt2
annotate org.eclipse.swt.win32.win32.x86/src/org/eclipse/swt/internal/image/PngChunk.d @ 120:536e43f63c81
Comprehensive update for Win32/Linux32 dmd-2.053/dmd-1.068+Tango-r5661
===D2===
* added [Try]Immutable/Const/Shared templates to work with differenses in D1/D2 instead of version statements
used these templates to work with strict type storage rules of dmd-2.053
* com.ibm.icu now also compilable with D2, but not tested yet
* small fixes
Snippet288 - shared data is in TLS
===Phobos===
* fixed critical bugs in Phobos implemention
completely incorrect segfault prone fromStringz (Linux's port ruthless killer)
terrible, incorrect StringBuffer realization (StyledText killer)
* fixed small bugs as well
Snippet72 - misprint in the snippet
* implemented missed functionality for Phobos
ByteArrayOutputStream implemented (image loading available)
formatting correctly works for all DWT's cases
As a result, folowing snippets now works with Phobos (Snippet### - what is fixed):
Snippet24, 42, 111, 115, 130, 235, 276 - bad string formatting
Snippet48, 282 - crash on image loading
Snippet163, 189, 211, 213, 217, 218, 222 - crash on copy/cut in StyledText
Snippet244 - hang-up
===Tango===
* few changes for the latest Tango trunc-r5661
* few small performance improvments
===General===
* implMissing-s for only one version changed to implMissingInTango/InPhobos
* incorrect calls to Format in toString-s fixed
* fixed loading \uXXXX characters in ResourceBundle
* added good UTF-8 support for StyledText, TextLayout (Win32) and friends
UTF functions revised and tested. It is now in java.nonstandard.*Utf modules
StyledText and TextLayout (Win32) modules revised for UTF-8 support
* removed small diferences in most identical files in *.swt.* folders
*.swt.internal.image, *.swt.events and *.swt.custom are identical in Win32/Linux32
now 179 of 576 (~31%) files in *.swt.* folders are fully identical
* Win32: snippets now have right subsystem, pretty icons and native system style controls
* small fixes in snippets
Snippet44 - it's not Snippet44
Snippet212 - functions work with different images and offsets arrays
Win32: Snippet282 - crash on close if the button has an image
Snippet293 - setGrayed is commented
and others
Win32: As a result, folowing snippets now works
Snippet68 - color doesn't change
Snippet163, 189, 211, 213, 217, 218, 222 - UTF-8 issues (see above)
Snippet193 - no tabel headers
author | Denis Shelomovskij <verylonglogin.reg@gmail.com> |
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date | Sat, 09 Jul 2011 15:50:20 +0300 |
parents | 9f4c18c268b2 |
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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 org.eclipse.swt.internal.image.PngChunk; |
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14 |
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15 |
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16 import org.eclipse.swt.SWT; |
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17 import org.eclipse.swt.internal.image.LEDataInputStream; |
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18 import org.eclipse.swt.internal.image.PngFileReadState; |
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19 import org.eclipse.swt.internal.image.PngIhdrChunk; |
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20 import org.eclipse.swt.internal.image.PngPlteChunk; |
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21 import org.eclipse.swt.internal.image.PngIdatChunk; |
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22 import org.eclipse.swt.internal.image.PngIendChunk; |
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23 import org.eclipse.swt.internal.image.PngTrnsChunk; |
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24 import java.lang.all; |
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25 |
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26 |
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27 class PngChunk { |
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28 byte[] reference; |
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29 |
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30 static const int LENGTH_OFFSET = 0; |
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31 static const int TYPE_OFFSET = 4; |
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32 static const int DATA_OFFSET = 8; |
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33 |
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34 static const int TYPE_FIELD_LENGTH = 4; |
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35 static const int LENGTH_FIELD_LENGTH = 4; |
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36 static const int MIN_LENGTH = 12; |
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37 |
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38 static const int CHUNK_UNKNOWN = -1; |
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39 // Critical chunks. |
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40 static const int CHUNK_IHDR = 0; |
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41 static const int CHUNK_PLTE = 1; |
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42 static const int CHUNK_IDAT = 2; |
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43 static const int CHUNK_IEND = 3; |
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44 // Non-critical chunks. |
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45 static const int CHUNK_tRNS = 5; |
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46 |
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47 static const byte[] TYPE_IHDR = cast(byte[])"IHDR";//{(byte) 'I', (byte) 'H', (byte) 'D', (byte) 'R'}; |
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48 static const byte[] TYPE_PLTE = cast(byte[])"PLTE";//{(byte) 'P', (byte) 'L', (byte) 'T', (byte) 'E'}; |
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49 static const byte[] TYPE_IDAT = cast(byte[])"IDAT";//{(byte) 'I', (byte) 'D', (byte) 'A', (byte) 'T'}; |
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50 static const byte[] TYPE_IEND = cast(byte[])"IEND";//{(byte) 'I', (byte) 'E', (byte) 'N', (byte) 'D'}; |
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51 static const byte[] TYPE_tRNS = cast(byte[])"tRNS";//{(byte) 't', (byte) 'R', (byte) 'N', (byte) 'S'}; |
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52 |
112 | 53 private static int[] _CRC_TABLE = null; |
54 static int[] CRC_TABLE() { | |
55 if (!_CRC_TABLE) static_this(); | |
56 return _CRC_TABLE; | |
57 } | |
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58 //public static void static_this() { |
112 | 59 private static void static_this() { |
60 _CRC_TABLE = new int[256]; | |
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61 for (int i = 0; i < 256; i++) { |
112 | 62 _CRC_TABLE[i] = i; |
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63 for (int j = 0; j < 8; j++) { |
112 | 64 if ((_CRC_TABLE[i] & 0x1) is 0) { |
65 _CRC_TABLE[i] = (_CRC_TABLE[i] >> 1) & 0x7FFFFFFF; | |
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66 } else { |
112 | 67 _CRC_TABLE[i] = 0xEDB88320 ^ ((_CRC_TABLE[i] >> 1) & 0x7FFFFFFF); |
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68 } |
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69 } |
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70 } |
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71 } |
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72 |
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73 int length; |
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74 |
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75 /** |
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76 * Construct a PngChunk using the reference bytes |
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77 * given. |
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78 */ |
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79 this(byte[] reference) { |
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80 setReference(reference); |
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81 if (reference.length < LENGTH_OFFSET + LENGTH_FIELD_LENGTH) SWT.error(SWT.ERROR_INVALID_IMAGE); |
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82 length = getInt32(LENGTH_OFFSET); |
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83 } |
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84 |
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85 /** |
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86 * Construct a PngChunk with the specified number of |
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87 * data bytes. |
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88 */ |
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89 this(int dataLength) { |
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90 this(new byte[MIN_LENGTH + dataLength]); |
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91 setLength(dataLength); |
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92 } |
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93 |
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94 /** |
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95 * Get the PngChunk's reference byteArray; |
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96 */ |
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97 byte[] getReference() { |
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98 return reference; |
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99 } |
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100 |
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101 /** |
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102 * Set the PngChunk's reference byteArray; |
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103 */ |
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104 void setReference(byte[] reference) { |
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105 this.reference = reference; |
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106 } |
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107 |
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108 /** |
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109 * Get the 16-bit integer from the reference byte |
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110 * array at the given offset. |
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111 */ |
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112 int getInt16(int offset) { |
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113 int answer = 0; |
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114 answer |= (reference[offset] & 0xFF) << 8; |
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115 answer |= (reference[offset + 1] & 0xFF); |
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116 return answer; |
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117 } |
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118 |
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119 /** |
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120 * Set the 16-bit integer in the reference byte |
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121 * array at the given offset. |
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122 */ |
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123 void setInt16(int offset, int value) { |
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124 reference[offset] = cast(byte) ((value >> 8) & 0xFF); |
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125 reference[offset + 1] = cast(byte) (value & 0xFF); |
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126 } |
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127 |
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128 /** |
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129 * Get the 32-bit integer from the reference byte |
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130 * array at the given offset. |
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131 */ |
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132 int getInt32(int offset) { |
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133 int answer = 0; |
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134 answer |= (reference[offset] & 0xFF) << 24; |
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135 answer |= (reference[offset + 1] & 0xFF) << 16; |
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136 answer |= (reference[offset + 2] & 0xFF) << 8; |
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137 answer |= (reference[offset + 3] & 0xFF); |
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138 return answer; |
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139 } |
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140 |
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141 /** |
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142 * Set the 32-bit integer in the reference byte |
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143 * array at the given offset. |
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144 */ |
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145 void setInt32(int offset, int value) { |
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146 reference[offset] = cast(byte) ((value >> 24) & 0xFF); |
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147 reference[offset + 1] = cast(byte) ((value >> 16) & 0xFF); |
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148 reference[offset + 2] = cast(byte) ((value >> 8) & 0xFF); |
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149 reference[offset + 3] = cast(byte) (value & 0xFF); |
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150 } |
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151 |
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152 /** |
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153 * Get the length of the data component of this chunk. |
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154 * This is not the length of the entire chunk. |
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155 */ |
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156 int getLength() { |
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157 return length; |
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158 } |
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159 |
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160 /** |
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161 * Set the length of the data component of this chunk. |
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162 * This is not the length of the entire chunk. |
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163 */ |
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164 void setLength(int value) { |
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165 setInt32(LENGTH_OFFSET, value); |
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166 length = value; |
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167 } |
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168 |
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169 /** |
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170 * Get the chunk type. This is a four byte value. |
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171 * Each byte should be an ASCII character. |
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172 * The first byte is upper case if the chunk is critical. |
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173 * The second byte is upper case if the chunk is publicly defined. |
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174 * The third byte must be upper case. |
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175 * The fourth byte is upper case if the chunk is unsafe to copy. |
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176 * Public chunk types are defined by the PNG Development Group. |
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177 */ |
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178 byte[] getTypeBytes() { |
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179 byte[] type = new byte[4]; |
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180 System.arraycopy(reference, TYPE_OFFSET, type, 0, TYPE_FIELD_LENGTH); |
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181 return type; |
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182 } |
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183 |
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184 /** |
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185 * Set the chunk type. This is a four byte value. |
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186 * Each byte should be an ASCII character. |
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187 * The first byte is upper case if the chunk is critical. |
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188 * The second byte is upper case if the chunk is publicly defined. |
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189 * The third byte must be upper case. |
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190 * The fourth byte is upper case if the chunk is unsafe to copy. |
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191 * Public chunk types are defined by the PNG Development Group. |
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192 */ |
120
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193 void setType(in byte[] value) { |
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194 if (value.length !is TYPE_FIELD_LENGTH) { |
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195 SWT.error (SWT.ERROR_INVALID_ARGUMENT); |
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196 } |
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197 System.arraycopy(value, 0, reference, TYPE_OFFSET, TYPE_FIELD_LENGTH); |
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198 } |
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199 |
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200 /** |
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201 * Get the chunk's data. |
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202 */ |
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203 byte[] getData() { |
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204 int dataLength = getLength(); |
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205 if (reference.length < MIN_LENGTH + dataLength) { |
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206 SWT.error (SWT.ERROR_INVALID_RANGE); |
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207 } |
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208 byte[] data = new byte[dataLength]; |
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209 System.arraycopy(reference, DATA_OFFSET, data, 0, dataLength); |
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210 return data; |
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211 } |
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212 |
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213 /** |
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214 * Set the chunk's data. |
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215 * This method has two side-effects. |
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216 * 1. It will set the length field to be the length |
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217 * of the data array given. |
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218 * 2. It will set the CRC field to the computed CRC |
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219 * value of the data array given. |
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220 */ |
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221 void setData(in byte[] data) { |
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222 setLength(data.length); |
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223 System.arraycopy(data, 0, reference, DATA_OFFSET, data.length); |
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224 setCRC(computeCRC()); |
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225 } |
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226 |
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227 /** |
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228 * Get the CRC value for the chunk's data. |
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229 * Ensure that the length field has a good |
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230 * value before making this call. |
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231 */ |
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232 int getCRC() { |
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233 int crcOffset = DATA_OFFSET + getLength(); |
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234 return getInt32(crcOffset); |
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235 } |
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236 |
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237 /** |
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238 * Set the CRC value for the chunk's data. |
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239 * Ensure that the length field has a good |
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240 * value before making this call. |
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241 */ |
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242 void setCRC(int value) { |
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243 int crcOffset = DATA_OFFSET + getLength(); |
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244 setInt32(crcOffset, value); |
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245 } |
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246 |
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247 /** |
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248 * Get the chunk's total size including the length, type, and crc fields. |
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249 */ |
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250 int getSize() { |
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251 return MIN_LENGTH + getLength(); |
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252 } |
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253 |
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254 /** |
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255 * Compute the CRC value for the chunk's data. Answer |
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256 * whether this value matches the value stored in the |
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257 * chunk. |
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258 */ |
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259 bool checkCRC() { |
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260 int crc = computeCRC(); |
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261 int storedCRC = getCRC(); |
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262 return crc is storedCRC; |
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263 } |
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264 |
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265 /** |
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266 * Answer the CRC value of chunk's data. |
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267 */ |
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268 int computeCRC() { |
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269 int crc = 0xFFFFFFFF; |
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270 int start = TYPE_OFFSET; |
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271 int stop = DATA_OFFSET + getLength(); |
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272 for (int i = start; i < stop; i++) { |
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273 int index = (crc ^ reference[i]) & 0xFF; |
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274 crc = CRC_TABLE[index] ^ ((crc >> 8) & 0x00FFFFFF); |
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275 } |
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276 return ~crc; |
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277 } |
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278 |
120
536e43f63c81
Comprehensive update for Win32/Linux32 dmd-2.053/dmd-1.068+Tango-r5661
Denis Shelomovskij <verylonglogin.reg@gmail.com>
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279 bool typeMatchesArray(in byte[] array) { |
0
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280 for (int i = 0; i < TYPE_FIELD_LENGTH; i++) { |
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281 if (reference[TYPE_OFFSET + i] !is array[i]){ |
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282 return false; |
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283 } |
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284 } |
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285 return true; |
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286 } |
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287 |
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288 bool isCritical() { |
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289 char c = cast(char) getTypeBytes()[0]; |
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290 return 'A' <= c && c <= 'Z'; |
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291 } |
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292 |
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293 int getChunkType() { |
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294 if (typeMatchesArray(TYPE_IHDR)) return CHUNK_IHDR; |
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295 if (typeMatchesArray(TYPE_PLTE)) return CHUNK_PLTE; |
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296 if (typeMatchesArray(TYPE_IDAT)) return CHUNK_IDAT; |
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297 if (typeMatchesArray(TYPE_IEND)) return CHUNK_IEND; |
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298 if (typeMatchesArray(TYPE_tRNS)) return CHUNK_tRNS; |
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299 return CHUNK_UNKNOWN; |
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300 } |
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301 |
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302 /** |
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303 * Read the next PNG chunk from the input stream given. |
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304 * If unable to read a chunk, return null. |
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305 */ |
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306 static PngChunk readNextFromStream(LEDataInputStream stream) { |
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307 try { |
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308 int headerLength = LENGTH_FIELD_LENGTH + TYPE_FIELD_LENGTH; |
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309 byte[] headerBytes = new byte[headerLength]; |
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310 int result = stream.read(headerBytes, 0, headerLength); |
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311 stream.unread(headerBytes); |
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312 if (result !is headerLength) return null; |
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313 |
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314 PngChunk tempChunk = new PngChunk(headerBytes); |
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315 |
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316 int chunkLength = tempChunk.getSize(); |
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317 byte[] chunk = new byte[chunkLength]; |
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318 |
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319 result = stream.read(chunk, 0, chunkLength); |
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320 if (result !is chunkLength) return null; |
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321 |
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322 switch (tempChunk.getChunkType()) { |
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323 case CHUNK_IHDR: |
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324 return new PngIhdrChunk(chunk); |
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325 case CHUNK_PLTE: |
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326 return new PngPlteChunk(chunk); |
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327 case CHUNK_IDAT: |
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328 return new PngIdatChunk(chunk); |
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329 case CHUNK_IEND: |
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330 return new PngIendChunk(chunk); |
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331 case CHUNK_tRNS: |
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332 return new PngTrnsChunk(chunk); |
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333 default: |
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334 return new PngChunk(chunk); |
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335 } |
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336 } catch (IOException e) { |
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337 return null; |
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338 } |
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339 } |
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340 |
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341 /** |
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342 * Answer whether the chunk is a valid PNG chunk. |
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343 */ |
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344 void validate(PngFileReadState readState, PngIhdrChunk headerChunk) { |
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345 if (reference.length < MIN_LENGTH) SWT.error(SWT.ERROR_INVALID_IMAGE); |
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346 |
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347 byte[] type = getTypeBytes(); |
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348 |
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349 // The third character MUST be upper case. |
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350 char c = cast(char) type[2]; |
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351 if (!('A' <= c && c <= 'Z')) SWT.error(SWT.ERROR_INVALID_IMAGE); |
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352 |
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353 // All characters must be letters. |
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354 for (int i = 0; i < TYPE_FIELD_LENGTH; i++) { |
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355 c = cast(char) type[i]; |
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356 if (!(('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z'))) { |
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357 SWT.error(SWT.ERROR_INVALID_IMAGE); |
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358 } |
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359 } |
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360 |
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361 // The stored CRC must match the data's computed CRC. |
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362 if (!checkCRC()) SWT.error(SWT.ERROR_INVALID_IMAGE); |
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363 } |
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364 |
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365 /** |
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366 * Provided so that subclasses can override and add |
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367 * data to the toString() call. |
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368 */ |
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369 String contributeToString() { |
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370 return ""; |
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371 } |
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372 |
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373 /** |
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374 * Returns a string containing a concise, human-readable |
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375 * description of the receiver. |
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376 * |
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377 * @return a string representation of the event |
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378 */ |
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379 public override String toString() { |
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380 String buffer = Format( "{\n\tLength: {}\n\tType: {}{}\n\tCRC: {:X}\n}", |
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381 getLength(), |
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382 cast(String) getTypeBytes(), |
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383 contributeToString(), |
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384 getCRC()); |
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385 return buffer; |
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386 } |
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387 |
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388 } |