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1 <?php
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2 // +----------------------------------------------------------------------+
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3 // | PHP version 5 |
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4 // +----------------------------------------------------------------------+
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5 // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |
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6 // +----------------------------------------------------------------------+
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7 // | This source file is subject to version 2 of the GPL license, |
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8 // | that is bundled with this package in the file license.txt and is |
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9 // | available through the world-wide-web at the following url: |
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10 // | http://www.gnu.org/copyleft/gpl.html |
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11 // +----------------------------------------------------------------------+
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12 // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |
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13 // +----------------------------------------------------------------------+
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14 // | Authors: James Heinrich <infoØgetid3*org> |
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15 // | Allan Hansen <ahØartemis*dk> |
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16 // +----------------------------------------------------------------------+
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17 // | module.graphic.png.php |
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18 // | Module for analyzing PNG graphic files. |
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19 // | dependencies: zlib support in PHP (optional) |
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20 // +----------------------------------------------------------------------+
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21 //
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22 // $Id: module.graphic.png.php,v 1.4 2006/11/02 10:48:02 ah Exp $
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23
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24
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25
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26 class getid3_png extends getid3_handler
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27 {
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28
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29 public function Analyze() {
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30
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31 $getid3 = $this->getid3;
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32
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33 $getid3->info['png'] = array ();
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34 $info_png = &$getid3->info['png'];
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35
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36 $getid3->info['fileformat'] = 'png';
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37 $getid3->info['video']['dataformat'] = 'png';
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38 $getid3->info['video']['lossless'] = false;
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39
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40 fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
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41 $png_filedata = fread($getid3->fp, getid3::FREAD_BUFFER_SIZE);
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42
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43 // Magic bytes "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A"
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44
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45 $offset = 8;
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46
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47 while (((ftell($getid3->fp) - (strlen($png_filedata) - $offset)) < $getid3->info['filesize'])) {
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48
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49 $chunk['data_length'] = getid3_lib::BigEndian2Int(substr($png_filedata, $offset, 4));
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50 $offset += 4;
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51 while (((strlen($png_filedata) - $offset) < ($chunk['data_length'] + 4)) && (ftell($getid3->fp) < $getid3->info['filesize'])) {
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52 $png_filedata .= fread($getid3->fp, getid3::FREAD_BUFFER_SIZE);
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53 }
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54
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55 $chunk['type_text'] = substr($png_filedata, $offset, 4);
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56 $chunk['type_raw'] = getid3_lib::BigEndian2Int($chunk['type_text']);
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57 $offset += 4;
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58
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59 $chunk['data'] = substr($png_filedata, $offset, $chunk['data_length']);
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60 $offset += $chunk['data_length'];
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61
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62 $chunk['crc'] = getid3_lib::BigEndian2Int(substr($png_filedata, $offset, 4));
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63 $offset += 4;
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64
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65 $chunk['flags']['ancilliary'] = (bool)($chunk['type_raw'] & 0x20000000);
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66 $chunk['flags']['private'] = (bool)($chunk['type_raw'] & 0x00200000);
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67 $chunk['flags']['reserved'] = (bool)($chunk['type_raw'] & 0x00002000);
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68 $chunk['flags']['safe_to_copy'] = (bool)($chunk['type_raw'] & 0x00000020);
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69
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70 // shortcut
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71 $info_png[$chunk['type_text']] = array ();
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72 $info_png_chunk_type_text = &$info_png[$chunk['type_text']];
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73
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74 switch ($chunk['type_text']) {
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75
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76 case 'IHDR': // Image Header
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77 $info_png_chunk_type_text['header'] = $chunk;
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78 $info_png_chunk_type_text['width'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4));
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79 $info_png_chunk_type_text['height'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4));
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80
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81 getid3_lib::ReadSequence('BigEndian2Int', $info_png_chunk_type_text['raw'], $chunk['data'], 8,
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82 array (
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83 'bit_depth' => 1,
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84 'color_type' => 1,
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85 'compression_method' => 1,
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86 'filter_method' => 1,
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87 'interlace_method' => 1
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88 )
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89 );
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90
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91 $info_png_chunk_type_text['compression_method_text'] = getid3_png::PNGcompressionMethodLookup($info_png_chunk_type_text['raw']['compression_method']);
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92 $info_png_chunk_type_text['color_type']['palette'] = (bool)($info_png_chunk_type_text['raw']['color_type'] & 0x01);
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93 $info_png_chunk_type_text['color_type']['true_color'] = (bool)($info_png_chunk_type_text['raw']['color_type'] & 0x02);
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94 $info_png_chunk_type_text['color_type']['alpha'] = (bool)($info_png_chunk_type_text['raw']['color_type'] & 0x04);
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95
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96 $getid3->info['video']['resolution_x'] = $info_png_chunk_type_text['width'];
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97 $getid3->info['video']['resolution_y'] = $info_png_chunk_type_text['height'];
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98
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99 $getid3->info['video']['bits_per_sample'] = getid3_png::IHDRcalculateBitsPerSample($info_png_chunk_type_text['raw']['color_type'], $info_png_chunk_type_text['raw']['bit_depth']);
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100 break;
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101
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102
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103 case 'PLTE': // Palette
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104 $info_png_chunk_type_text['header'] = $chunk;
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105 $palette_offset = 0;
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106 for ($i = 0; $i <= 255; $i++) {
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107 $red = @getid3_lib::BigEndian2Int($chunk['data']{$palette_offset++});
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108 $green = @getid3_lib::BigEndian2Int($chunk['data']{$palette_offset++});
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109 $blue = @getid3_lib::BigEndian2Int($chunk['data']{$palette_offset++});
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110 $info_png_chunk_type_text[$i] = (($red << 16) | ($green << 8) | ($blue));
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111 }
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112 break;
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113
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114
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115 case 'tRNS': // Transparency
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116 $info_png_chunk_type_text['header'] = $chunk;
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117 switch ($info_png['IHDR']['raw']['color_type']) {
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118 case 0:
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119 $info_png_chunk_type_text['transparent_color_gray'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 2));
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120 break;
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121
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122 case 2:
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123 $info_png_chunk_type_text['transparent_color_red'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 2));
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124 $info_png_chunk_type_text['transparent_color_green'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2, 2));
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125 $info_png_chunk_type_text['transparent_color_blue'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 2));
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126 break;
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127
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128 case 3:
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129 for ($i = 0; $i < strlen($chunk['data']); $i++) {
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130 $info_png_chunk_type_text['palette_opacity'][$i] = getid3_lib::BigEndian2Int($chunk['data'][$i]);
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131 }
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132 break;
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133
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134 case 4:
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135 case 6:
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136 throw new getid3_exception('Invalid color_type in tRNS chunk: '.$info_png['IHDR']['raw']['color_type']);
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137
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138 default:
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139 $getid3->warning('Unhandled color_type in tRNS chunk: '.$info_png['IHDR']['raw']['color_type']);
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140 break;
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141 }
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142 break;
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143
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144
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145 case 'gAMA': // Image Gamma
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146 $info_png_chunk_type_text['header'] = $chunk;
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147 $info_png_chunk_type_text['gamma'] = getid3_lib::BigEndian2Int($chunk['data']) / 100000;
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148 break;
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149
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150
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151 case 'cHRM': // Primary Chromaticities
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152 $info_png_chunk_type_text['header'] = $chunk;
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153 $info_png_chunk_type_text['white_x'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4)) / 100000;
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154 $info_png_chunk_type_text['white_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4)) / 100000;
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155 $info_png_chunk_type_text['red_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 8, 4)) / 100000;
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156 $info_png_chunk_type_text['red_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 12, 4)) / 100000;
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157 $info_png_chunk_type_text['green_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 16, 4)) / 100000;
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158 $info_png_chunk_type_text['green_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 20, 4)) / 100000;
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159 $info_png_chunk_type_text['blue_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 24, 4)) / 100000;
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160 $info_png_chunk_type_text['blue_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 28, 4)) / 100000;
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161 break;
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162
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163
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164 case 'sRGB': // Standard RGB Color Space
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165 $info_png_chunk_type_text['header'] = $chunk;
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166 $info_png_chunk_type_text['reindering_intent'] = getid3_lib::BigEndian2Int($chunk['data']);
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167 $info_png_chunk_type_text['reindering_intent_text'] = getid3_png::PNGsRGBintentLookup($info_png_chunk_type_text['reindering_intent']);
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168 break;
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169
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170
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171 case 'iCCP': // Embedded ICC Profile
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172 $info_png_chunk_type_text['header'] = $chunk;
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173 list($profilename, $compressiondata) = explode("\x00", $chunk['data'], 2);
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174 $info_png_chunk_type_text['profile_name'] = $profilename;
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175 $info_png_chunk_type_text['compression_method'] = getid3_lib::BigEndian2Int($compressiondata[0]);
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176 $info_png_chunk_type_text['compression_profile'] = substr($compressiondata, 1);
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177 $info_png_chunk_type_text['compression_method_text'] = getid3_png::PNGcompressionMethodLookup($info_png_chunk_type_text['compression_method']);
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178 break;
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179
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180
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181 case 'tEXt': // Textual Data
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182 $info_png_chunk_type_text['header'] = $chunk;
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183 list($keyword, $text) = explode("\x00", $chunk['data'], 2);
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184 $info_png_chunk_type_text['keyword'] = $keyword;
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185 $info_png_chunk_type_text['text'] = $text;
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186
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187 $info_png['comments'][$info_png_chunk_type_text['keyword']][] = $info_png_chunk_type_text['text'];
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188 break;
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189
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190
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191 case 'zTXt': // Compressed Textual Data
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192 $info_png_chunk_type_text['header'] = $chunk;
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193 list($keyword, $otherdata) = explode("\x00", $chunk['data'], 2);
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194 $info_png_chunk_type_text['keyword'] = $keyword;
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195 $info_png_chunk_type_text['compression_method'] = getid3_lib::BigEndian2Int(substr($otherdata, 0, 1));
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196 $info_png_chunk_type_text['compressed_text'] = substr($otherdata, 1);
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197 $info_png_chunk_type_text['compression_method_text'] = getid3_png::PNGcompressionMethodLookup($info_png_chunk_type_text['compression_method']);
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198
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199 if ($info_png_chunk_type_text['compression_method'] != 0) {
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200 // unknown compression method
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201 break;
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202 }
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203
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204 if (function_exists('gzuncompress')) {
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205 $info_png_chunk_type_text['text'] = gzuncompress($info_png_chunk_type_text['compressed_text']);
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206 }
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207 else {
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208 if (!@$this->zlib_warning) {
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209 $getid3->warning('PHP does not have --with-zlib support - cannot gzuncompress()');
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210 }
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211 $this->zlib_warning = true;
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212 }
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213
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214
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215 if (isset($info_png_chunk_type_text['text'])) {
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216 $info_png['comments'][$info_png_chunk_type_text['keyword']][] = $info_png_chunk_type_text['text'];
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217 }
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218 break;
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219
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220
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221 case 'iTXt': // International Textual Data
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222 $info_png_chunk_type_text['header'] = $chunk;
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223 list($keyword, $otherdata) = explode("\x00", $chunk['data'], 2);
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224 $info_png_chunk_type_text['keyword'] = $keyword;
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225 $info_png_chunk_type_text['compression'] = (bool)getid3_lib::BigEndian2Int(substr($otherdata, 0, 1));
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226 $info_png_chunk_type_text['compression_method'] = getid3_lib::BigEndian2Int($otherdata[1]);
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227 $info_png_chunk_type_text['compression_method_text'] = getid3_png::PNGcompressionMethodLookup($info_png_chunk_type_text['compression_method']);
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228 list($languagetag, $translatedkeyword, $text) = explode("\x00", substr($otherdata, 2), 3);
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229 $info_png_chunk_type_text['language_tag'] = $languagetag;
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230 $info_png_chunk_type_text['translated_keyword'] = $translatedkeyword;
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231
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232 if ($info_png_chunk_type_text['compression']) {
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233
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234 switch ($info_png_chunk_type_text['compression_method']) {
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235 case 0:
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236 if (function_exists('gzuncompress')) {
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237 $info_png_chunk_type_text['text'] = gzuncompress($text);
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238 }
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239 else {
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240 if (!@$this->zlib_warning) {
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241 $getid3->warning('PHP does not have --with-zlib support - cannot gzuncompress()');
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242 }
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243 $this->zlib_warning = true;
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244 }
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245 break;
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246
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247 default:
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248 // unknown compression method
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249 break;
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250 }
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251
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252 } else {
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253
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254 $info_png_chunk_type_text['text'] = $text;
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255
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256 }
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257
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258 if (isset($info_png_chunk_type_text['text'])) {
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259 $info_png['comments'][$info_png_chunk_type_text['keyword']][] = $info_png_chunk_type_text['text'];
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260 }
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|
rlm@3
|
261 break;
|
|
rlm@3
|
262
|
|
rlm@3
|
263
|
|
rlm@3
|
264 case 'bKGD': // Background Color
|
|
rlm@3
|
265 $info_png_chunk_type_text['header'] = $chunk;
|
|
rlm@3
|
266 switch ($info_png['IHDR']['raw']['color_type']) {
|
|
rlm@3
|
267 case 0:
|
|
rlm@3
|
268 case 4:
|
|
rlm@3
|
269 $info_png_chunk_type_text['background_gray'] = getid3_lib::BigEndian2Int($chunk['data']);
|
|
rlm@3
|
270 break;
|
|
rlm@3
|
271
|
|
rlm@3
|
272 case 2:
|
|
rlm@3
|
273 case 6:
|
|
rlm@3
|
274 $info_png_chunk_type_text['background_red'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0 * $info_png['IHDR']['raw']['bit_depth'], $info_png['IHDR']['raw']['bit_depth']));
|
|
rlm@3
|
275 $info_png_chunk_type_text['background_green'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 1 * $info_png['IHDR']['raw']['bit_depth'], $info_png['IHDR']['raw']['bit_depth']));
|
|
rlm@3
|
276 $info_png_chunk_type_text['background_blue'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2 * $info_png['IHDR']['raw']['bit_depth'], $info_png['IHDR']['raw']['bit_depth']));
|
|
rlm@3
|
277 break;
|
|
rlm@3
|
278
|
|
rlm@3
|
279 case 3:
|
|
rlm@3
|
280 $info_png_chunk_type_text['background_index'] = getid3_lib::BigEndian2Int($chunk['data']);
|
|
rlm@3
|
281 break;
|
|
rlm@3
|
282
|
|
rlm@3
|
283 default:
|
|
rlm@3
|
284 break;
|
|
rlm@3
|
285 }
|
|
rlm@3
|
286 break;
|
|
rlm@3
|
287
|
|
rlm@3
|
288
|
|
rlm@3
|
289 case 'pHYs': // Physical Pixel Dimensions
|
|
rlm@3
|
290 $info_png_chunk_type_text['header'] = $chunk;
|
|
rlm@3
|
291 $info_png_chunk_type_text['pixels_per_unit_x'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4));
|
|
rlm@3
|
292 $info_png_chunk_type_text['pixels_per_unit_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4));
|
|
rlm@3
|
293 $info_png_chunk_type_text['unit_specifier'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 8, 1));
|
|
rlm@3
|
294 $info_png_chunk_type_text['unit'] = getid3_png::PNGpHYsUnitLookup($info_png_chunk_type_text['unit_specifier']);
|
|
rlm@3
|
295 break;
|
|
rlm@3
|
296
|
|
rlm@3
|
297
|
|
rlm@3
|
298 case 'sBIT': // Significant Bits
|
|
rlm@3
|
299 $info_png_chunk_type_text['header'] = $chunk;
|
|
rlm@3
|
300 switch ($info_png['IHDR']['raw']['color_type']) {
|
|
rlm@3
|
301 case 0:
|
|
rlm@3
|
302 $info_png_chunk_type_text['significant_bits_gray'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1));
|
|
rlm@3
|
303 break;
|
|
rlm@3
|
304
|
|
rlm@3
|
305 case 2:
|
|
rlm@3
|
306 case 3:
|
|
rlm@3
|
307 $info_png_chunk_type_text['significant_bits_red'] = getid3_lib::BigEndian2Int($chunk['data'][0]);
|
|
rlm@3
|
308 $info_png_chunk_type_text['significant_bits_green'] = getid3_lib::BigEndian2Int($chunk['data'][1]);
|
|
rlm@3
|
309 $info_png_chunk_type_text['significant_bits_blue'] = getid3_lib::BigEndian2Int($chunk['data'][2]);
|
|
rlm@3
|
310 break;
|
|
rlm@3
|
311
|
|
rlm@3
|
312 case 4:
|
|
rlm@3
|
313 $info_png_chunk_type_text['significant_bits_gray'] = getid3_lib::BigEndian2Int($chunk['data'][0]);
|
|
rlm@3
|
314 $info_png_chunk_type_text['significant_bits_alpha'] = getid3_lib::BigEndian2Int($chunk['data'][1]);
|
|
rlm@3
|
315 break;
|
|
rlm@3
|
316
|
|
rlm@3
|
317 case 6:
|
|
rlm@3
|
318 $info_png_chunk_type_text['significant_bits_red'] = getid3_lib::BigEndian2Int($chunk['data'][0]);
|
|
rlm@3
|
319 $info_png_chunk_type_text['significant_bits_green'] = getid3_lib::BigEndian2Int($chunk['data'][1]);
|
|
rlm@3
|
320 $info_png_chunk_type_text['significant_bits_blue'] = getid3_lib::BigEndian2Int($chunk['data'][2]);
|
|
rlm@3
|
321 $info_png_chunk_type_text['significant_bits_alpha'] = getid3_lib::BigEndian2Int($chunk['data'][3]);
|
|
rlm@3
|
322 break;
|
|
rlm@3
|
323
|
|
rlm@3
|
324 default:
|
|
rlm@3
|
325 break;
|
|
rlm@3
|
326 }
|
|
rlm@3
|
327 break;
|
|
rlm@3
|
328
|
|
rlm@3
|
329
|
|
rlm@3
|
330 case 'sPLT': // Suggested Palette
|
|
rlm@3
|
331 $info_png_chunk_type_text['header'] = $chunk;
|
|
rlm@3
|
332
|
|
rlm@3
|
333 list($palettename, $otherdata) = explode("\x00", $chunk['data'], 2);
|
|
rlm@3
|
334 $info_png_chunk_type_text['palette_name'] = $palettename;
|
|
rlm@3
|
335
|
|
rlm@3
|
336 $info_png_chunk_type_text['sample_depth_bits'] = getid3_lib::BigEndian2Int($otherdata[0]);
|
|
rlm@3
|
337 $info_png_chunk_type_text['sample_depth_bytes'] = $info_png_chunk_type_text['sample_depth_bits'] / 8;
|
|
rlm@3
|
338
|
|
rlm@3
|
339 $s_plt_offset = 1;
|
|
rlm@3
|
340 $paletteCounter = 0;
|
|
rlm@3
|
341 while ($s_plt_offset < strlen($otherdata)) {
|
|
rlm@3
|
342
|
|
rlm@3
|
343 $info_png_chunk_type_text['red'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $s_plt_offset, $info_png_chunk_type_text['sample_depth_bytes']));
|
|
rlm@3
|
344 $s_plt_offset += $info_png_chunk_type_text['sample_depth_bytes'];
|
|
rlm@3
|
345
|
|
rlm@3
|
346 $info_png_chunk_type_text['green'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $s_plt_offset, $info_png_chunk_type_text['sample_depth_bytes']));
|
|
rlm@3
|
347 $s_plt_offset += $info_png_chunk_type_text['sample_depth_bytes'];
|
|
rlm@3
|
348
|
|
rlm@3
|
349 $info_png_chunk_type_text['blue'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $s_plt_offset, $info_png_chunk_type_text['sample_depth_bytes']));
|
|
rlm@3
|
350 $s_plt_offset += $info_png_chunk_type_text['sample_depth_bytes'];
|
|
rlm@3
|
351
|
|
rlm@3
|
352 $info_png_chunk_type_text['alpha'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $s_plt_offset, $info_png_chunk_type_text['sample_depth_bytes']));
|
|
rlm@3
|
353 $s_plt_offset += $info_png_chunk_type_text['sample_depth_bytes'];
|
|
rlm@3
|
354
|
|
rlm@3
|
355 $info_png_chunk_type_text['frequency'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $s_plt_offset, 2));
|
|
rlm@3
|
356 $s_plt_offset += 2;
|
|
rlm@3
|
357
|
|
rlm@3
|
358 $paletteCounter++;
|
|
rlm@3
|
359 }
|
|
rlm@3
|
360 break;
|
|
rlm@3
|
361
|
|
rlm@3
|
362
|
|
rlm@3
|
363 case 'hIST': // Palette Histogram
|
|
rlm@3
|
364 $info_png_chunk_type_text['header'] = $chunk;
|
|
rlm@3
|
365 $h_ist_counter = 0;
|
|
rlm@3
|
366 while ($h_ist_counter < strlen($chunk['data'])) {
|
|
rlm@3
|
367 $info_png_chunk_type_text[$h_ist_counter] = getid3_lib::BigEndian2Int(substr($chunk['data'], $h_ist_counter / 2, 2));
|
|
rlm@3
|
368 $h_ist_counter += 2;
|
|
rlm@3
|
369 }
|
|
rlm@3
|
370 break;
|
|
rlm@3
|
371
|
|
rlm@3
|
372
|
|
rlm@3
|
373 case 'tIME': // Image Last-Modification Time
|
|
rlm@3
|
374 $info_png_chunk_type_text['header'] = $chunk;
|
|
rlm@3
|
375 $info_png_chunk_type_text['year'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 2));
|
|
rlm@3
|
376 $info_png_chunk_type_text['month'] = getid3_lib::BigEndian2Int($chunk['data']{2});
|
|
rlm@3
|
377 $info_png_chunk_type_text['day'] = getid3_lib::BigEndian2Int($chunk['data']{3});
|
|
rlm@3
|
378 $info_png_chunk_type_text['hour'] = getid3_lib::BigEndian2Int($chunk['data']{4});
|
|
rlm@3
|
379 $info_png_chunk_type_text['minute'] = getid3_lib::BigEndian2Int($chunk['data']{5});
|
|
rlm@3
|
380 $info_png_chunk_type_text['second'] = getid3_lib::BigEndian2Int($chunk['data']{6});
|
|
rlm@3
|
381 $info_png_chunk_type_text['unix'] = gmmktime($info_png_chunk_type_text['hour'], $info_png_chunk_type_text['minute'], $info_png_chunk_type_text['second'], $info_png_chunk_type_text['month'], $info_png_chunk_type_text['day'], $info_png_chunk_type_text['year']);
|
|
rlm@3
|
382 break;
|
|
rlm@3
|
383
|
|
rlm@3
|
384
|
|
rlm@3
|
385 case 'oFFs': // Image Offset
|
|
rlm@3
|
386 $info_png_chunk_type_text['header'] = $chunk;
|
|
rlm@3
|
387 $info_png_chunk_type_text['position_x'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4), false, true);
|
|
rlm@3
|
388 $info_png_chunk_type_text['position_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4), false, true);
|
|
rlm@3
|
389 $info_png_chunk_type_text['unit_specifier'] = getid3_lib::BigEndian2Int($chunk['data'][8]);
|
|
rlm@3
|
390 $info_png_chunk_type_text['unit'] = getid3_png::PNGoFFsUnitLookup($info_png_chunk_type_text['unit_specifier']);
|
|
rlm@3
|
391 break;
|
|
rlm@3
|
392
|
|
rlm@3
|
393
|
|
rlm@3
|
394 case 'pCAL': // Calibration Of Pixel Values
|
|
rlm@3
|
395 $info_png_chunk_type_text['header'] = $chunk;
|
|
rlm@3
|
396 list($calibrationname, $otherdata) = explode("\x00", $chunk['data'], 2);
|
|
rlm@3
|
397 $info_png_chunk_type_text['calibration_name'] = $calibrationname;
|
|
rlm@3
|
398 $info_png_chunk_type_text['original_zero'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4), false, true);
|
|
rlm@3
|
399 $info_png_chunk_type_text['original_max'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4), false, true);
|
|
rlm@3
|
400 $info_png_chunk_type_text['equation_type'] = getid3_lib::BigEndian2Int($chunk['data'][8]);
|
|
rlm@3
|
401 $info_png_chunk_type_text['equation_type_text'] = getid3_png::PNGpCALequationTypeLookup($info_png_chunk_type_text['equation_type']);
|
|
rlm@3
|
402 $info_png_chunk_type_text['parameter_count'] = getid3_lib::BigEndian2Int($chunk['data'][9]);
|
|
rlm@3
|
403 $info_png_chunk_type_text['parameters'] = explode("\x00", substr($chunk['data'], 10));
|
|
rlm@3
|
404 break;
|
|
rlm@3
|
405
|
|
rlm@3
|
406
|
|
rlm@3
|
407 case 'sCAL': // Physical Scale Of Image Subject
|
|
rlm@3
|
408 $info_png_chunk_type_text['header'] = $chunk;
|
|
rlm@3
|
409 $info_png_chunk_type_text['unit_specifier'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1));
|
|
rlm@3
|
410 $info_png_chunk_type_text['unit'] = getid3_png::PNGsCALUnitLookup($info_png_chunk_type_text['unit_specifier']);
|
|
rlm@3
|
411 list($info_png_chunk_type_text['pixel_width'], $info_png_chunk_type_text['pixel_height']) = explode("\x00", substr($chunk['data'], 1));
|
|
rlm@3
|
412 break;
|
|
rlm@3
|
413
|
|
rlm@3
|
414
|
|
rlm@3
|
415 case 'gIFg': // GIF Graphic Control Extension
|
|
rlm@3
|
416 $gIFg_counter = 0;
|
|
rlm@3
|
417 if (isset($info_png_chunk_type_text) && is_array($info_png_chunk_type_text)) {
|
|
rlm@3
|
418 $gIFg_counter = count($info_png_chunk_type_text);
|
|
rlm@3
|
419 }
|
|
rlm@3
|
420 $info_png_chunk_type_text[$gIFg_counter]['header'] = $chunk;
|
|
rlm@3
|
421 $info_png_chunk_type_text[$gIFg_counter]['disposal_method'] = getid3_lib::BigEndian2Int($chunk['data'][0]);
|
|
rlm@3
|
422 $info_png_chunk_type_text[$gIFg_counter]['user_input_flag'] = getid3_lib::BigEndian2Int($chunk['data'][1]);
|
|
rlm@3
|
423 $info_png_chunk_type_text[$gIFg_counter]['delay_time'] = getid3_lib::BigEndian2Int($chunk['data'][2]);
|
|
rlm@3
|
424 break;
|
|
rlm@3
|
425
|
|
rlm@3
|
426
|
|
rlm@3
|
427 case 'gIFx': // GIF Application Extension
|
|
rlm@3
|
428 $gIFx_counter = 0;
|
|
rlm@3
|
429 if (isset($info_png_chunk_type_text) && is_array($info_png_chunk_type_text)) {
|
|
rlm@3
|
430 $gIFx_counter = count($info_png_chunk_type_text);
|
|
rlm@3
|
431 }
|
|
rlm@3
|
432 $info_png_chunk_type_text[$gIFx_counter]['header'] = $chunk;
|
|
rlm@3
|
433 $info_png_chunk_type_text[$gIFx_counter]['application_identifier'] = substr($chunk['data'], 0, 8);
|
|
rlm@3
|
434 $info_png_chunk_type_text[$gIFx_counter]['authentication_code'] = substr($chunk['data'], 8, 3);
|
|
rlm@3
|
435 $info_png_chunk_type_text[$gIFx_counter]['application_data'] = substr($chunk['data'], 11);
|
|
rlm@3
|
436 break;
|
|
rlm@3
|
437
|
|
rlm@3
|
438
|
|
rlm@3
|
439 case 'IDAT': // Image Data
|
|
rlm@3
|
440 $idat_information_field_index = 0;
|
|
rlm@3
|
441 if (isset($info_png['IDAT']) && is_array($info_png['IDAT'])) {
|
|
rlm@3
|
442 $idat_information_field_index = count($info_png['IDAT']);
|
|
rlm@3
|
443 }
|
|
rlm@3
|
444 unset($chunk['data']);
|
|
rlm@3
|
445 $info_png_chunk_type_text[$idat_information_field_index]['header'] = $chunk;
|
|
rlm@3
|
446 break;
|
|
rlm@3
|
447
|
|
rlm@3
|
448
|
|
rlm@3
|
449 case 'IEND': // Image Trailer
|
|
rlm@3
|
450 $info_png_chunk_type_text['header'] = $chunk;
|
|
rlm@3
|
451 break;
|
|
rlm@3
|
452
|
|
rlm@3
|
453
|
|
rlm@3
|
454 default:
|
|
rlm@3
|
455 $info_png_chunk_type_text['header'] = $chunk;
|
|
rlm@3
|
456 $getid3->warning('Unhandled chunk type: '.$chunk['type_text']);
|
|
rlm@3
|
457 break;
|
|
rlm@3
|
458 }
|
|
rlm@3
|
459 }
|
|
rlm@3
|
460
|
|
rlm@3
|
461 return true;
|
|
rlm@3
|
462 }
|
|
rlm@3
|
463
|
|
rlm@3
|
464
|
|
rlm@3
|
465
|
|
rlm@3
|
466 public static function PNGsRGBintentLookup($sRGB) {
|
|
rlm@3
|
467
|
|
rlm@3
|
468 static $lookup = array (
|
|
rlm@3
|
469 0 => 'Perceptual',
|
|
rlm@3
|
470 1 => 'Relative colorimetric',
|
|
rlm@3
|
471 2 => 'Saturation',
|
|
rlm@3
|
472 3 => 'Absolute colorimetric'
|
|
rlm@3
|
473 );
|
|
rlm@3
|
474 return (isset($lookup[$sRGB]) ? $lookup[$sRGB] : 'invalid');
|
|
rlm@3
|
475 }
|
|
rlm@3
|
476
|
|
rlm@3
|
477
|
|
rlm@3
|
478
|
|
rlm@3
|
479 public static function PNGcompressionMethodLookup($compression_method) {
|
|
rlm@3
|
480
|
|
rlm@3
|
481 return ($compression_method == 0 ? 'deflate/inflate' : 'invalid');
|
|
rlm@3
|
482 }
|
|
rlm@3
|
483
|
|
rlm@3
|
484
|
|
rlm@3
|
485
|
|
rlm@3
|
486 public static function PNGpHYsUnitLookup($unit_id) {
|
|
rlm@3
|
487
|
|
rlm@3
|
488 static $lookup = array (
|
|
rlm@3
|
489 0 => 'unknown',
|
|
rlm@3
|
490 1 => 'meter'
|
|
rlm@3
|
491 );
|
|
rlm@3
|
492 return (isset($lookup[$unit_id]) ? $lookup[$unit_id] : 'invalid');
|
|
rlm@3
|
493 }
|
|
rlm@3
|
494
|
|
rlm@3
|
495
|
|
rlm@3
|
496
|
|
rlm@3
|
497 public static function PNGoFFsUnitLookup($unit_id) {
|
|
rlm@3
|
498
|
|
rlm@3
|
499 static $lookup = array (
|
|
rlm@3
|
500 0 => 'pixel',
|
|
rlm@3
|
501 1 => 'micrometer'
|
|
rlm@3
|
502 );
|
|
rlm@3
|
503 return (isset($lookup[$unit_id]) ? $lookup[$unit_id] : 'invalid');
|
|
rlm@3
|
504 }
|
|
rlm@3
|
505
|
|
rlm@3
|
506
|
|
rlm@3
|
507
|
|
rlm@3
|
508 public static function PNGpCALequationTypeLookup($equation_type) {
|
|
rlm@3
|
509
|
|
rlm@3
|
510 static $lookup = array (
|
|
rlm@3
|
511 0 => 'Linear mapping',
|
|
rlm@3
|
512 1 => 'Base-e exponential mapping',
|
|
rlm@3
|
513 2 => 'Arbitrary-base exponential mapping',
|
|
rlm@3
|
514 3 => 'Hyperbolic mapping'
|
|
rlm@3
|
515 );
|
|
rlm@3
|
516 return (isset($lookup[$equation_type]) ? $lookup[$equation_type] : 'invalid');
|
|
rlm@3
|
517 }
|
|
rlm@3
|
518
|
|
rlm@3
|
519
|
|
rlm@3
|
520
|
|
rlm@3
|
521 public static function PNGsCALUnitLookup($unit_id) {
|
|
rlm@3
|
522
|
|
rlm@3
|
523 static $lookup = array (
|
|
rlm@3
|
524 0 => 'meter',
|
|
rlm@3
|
525 1 => 'radian'
|
|
rlm@3
|
526 );
|
|
rlm@3
|
527 return (isset($lookup[$unit_id]) ? $lookup[$unit_id] : 'invalid');
|
|
rlm@3
|
528 }
|
|
rlm@3
|
529
|
|
rlm@3
|
530
|
|
rlm@3
|
531
|
|
rlm@3
|
532 public static function IHDRcalculateBitsPerSample($color_type, $bit_depth) {
|
|
rlm@3
|
533
|
|
rlm@3
|
534 switch ($color_type) {
|
|
rlm@3
|
535 case 0: // Each pixel is a grayscale sample.
|
|
rlm@3
|
536 return $bit_depth;
|
|
rlm@3
|
537
|
|
rlm@3
|
538 case 2: // Each pixel is an R,G,B triple
|
|
rlm@3
|
539 return 3 * $bit_depth;
|
|
rlm@3
|
540
|
|
rlm@3
|
541 case 3: // Each pixel is a palette index; a PLTE chunk must appear.
|
|
rlm@3
|
542 return $bit_depth;
|
|
rlm@3
|
543
|
|
rlm@3
|
544 case 4: // Each pixel is a grayscale sample, followed by an alpha sample.
|
|
rlm@3
|
545 return 2 * $bit_depth;
|
|
rlm@3
|
546
|
|
rlm@3
|
547 case 6: // Each pixel is an R,G,B triple, followed by an alpha sample.
|
|
rlm@3
|
548 return 4 * $bit_depth;
|
|
rlm@3
|
549 }
|
|
rlm@3
|
550 return false;
|
|
rlm@3
|
551 }
|
|
rlm@3
|
552
|
|
rlm@3
|
553 }
|
|
rlm@3
|
554
|
|
rlm@3
|
555
|
|
rlm@3
|
556 ?> |
