1 | <?php |
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2 | ///////////////////////////////////////////////////////////////// |
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3 | /// getID3() by James Heinrich <info@getid3.org> // |
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4 | // available at http://getid3.sourceforge.net // |
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5 | // or http://www.getid3.org // |
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6 | ///////////////////////////////////////////////////////////////// |
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7 | // See readme.txt for more details // |
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8 | ///////////////////////////////////////////////////////////////// |
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9 | // // |
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10 | // module.graphic.png.php // |
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11 | // module for analyzing PNG Image files // |
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12 | // dependencies: NONE // |
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13 | // /// |
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14 | ///////////////////////////////////////////////////////////////// |
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15 | |
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16 | |
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17 | class getid3_png |
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18 | { |
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19 | |
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20 | function getid3_png(&$fd, &$ThisFileInfo) { |
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21 | |
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22 | // shortcut |
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23 | $ThisFileInfo['png'] = array(); |
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24 | $thisfile_png = &$ThisFileInfo['png']; |
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25 | |
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26 | $ThisFileInfo['fileformat'] = 'png'; |
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27 | $ThisFileInfo['video']['dataformat'] = 'png'; |
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28 | $ThisFileInfo['video']['lossless'] = false; |
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29 | |
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30 | fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET); |
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31 | $PNGfiledata = fread($fd, GETID3_FREAD_BUFFER_SIZE); |
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32 | $offset = 0; |
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33 | |
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34 | $PNGidentifier = substr($PNGfiledata, $offset, 8); // $89 $50 $4E $47 $0D $0A $1A $0A |
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35 | $offset += 8; |
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36 | |
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37 | if ($PNGidentifier != "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A") { |
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38 | $ThisFileInfo['error'][] = 'First 8 bytes of file ('.getid3_lib::PrintHexBytes($PNGidentifier).') did not match expected PNG identifier'; |
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39 | unset($ThisFileInfo['fileformat']); |
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40 | return false; |
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41 | } |
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42 | |
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43 | while (((ftell($fd) - (strlen($PNGfiledata) - $offset)) < $ThisFileInfo['filesize'])) { |
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44 | $chunk['data_length'] = getid3_lib::BigEndian2Int(substr($PNGfiledata, $offset, 4)); |
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45 | $offset += 4; |
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46 | while (((strlen($PNGfiledata) - $offset) < ($chunk['data_length'] + 4)) && (ftell($fd) < $ThisFileInfo['filesize'])) { |
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47 | $PNGfiledata .= fread($fd, GETID3_FREAD_BUFFER_SIZE); |
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48 | } |
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49 | $chunk['type_text'] = substr($PNGfiledata, $offset, 4); |
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50 | $offset += 4; |
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51 | $chunk['type_raw'] = getid3_lib::BigEndian2Int($chunk['type_text']); |
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52 | $chunk['data'] = substr($PNGfiledata, $offset, $chunk['data_length']); |
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53 | $offset += $chunk['data_length']; |
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54 | $chunk['crc'] = getid3_lib::BigEndian2Int(substr($PNGfiledata, $offset, 4)); |
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55 | $offset += 4; |
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56 | |
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57 | $chunk['flags']['ancilliary'] = (bool) ($chunk['type_raw'] & 0x20000000); |
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58 | $chunk['flags']['private'] = (bool) ($chunk['type_raw'] & 0x00200000); |
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59 | $chunk['flags']['reserved'] = (bool) ($chunk['type_raw'] & 0x00002000); |
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60 | $chunk['flags']['safe_to_copy'] = (bool) ($chunk['type_raw'] & 0x00000020); |
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61 | |
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62 | // shortcut |
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63 | $thisfile_png[$chunk['type_text']] = array(); |
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64 | $thisfile_png_chunk_type_text = &$thisfile_png[$chunk['type_text']]; |
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65 | |
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66 | switch ($chunk['type_text']) { |
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67 | |
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68 | case 'IHDR': // Image Header |
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69 | $thisfile_png_chunk_type_text['header'] = $chunk; |
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70 | $thisfile_png_chunk_type_text['width'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4)); |
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71 | $thisfile_png_chunk_type_text['height'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4)); |
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72 | $thisfile_png_chunk_type_text['raw']['bit_depth'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 8, 1)); |
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73 | $thisfile_png_chunk_type_text['raw']['color_type'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 9, 1)); |
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74 | $thisfile_png_chunk_type_text['raw']['compression_method'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 10, 1)); |
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75 | $thisfile_png_chunk_type_text['raw']['filter_method'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 11, 1)); |
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76 | $thisfile_png_chunk_type_text['raw']['interlace_method'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 12, 1)); |
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77 | |
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78 | $thisfile_png_chunk_type_text['compression_method_text'] = $this->PNGcompressionMethodLookup($thisfile_png_chunk_type_text['raw']['compression_method']); |
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79 | $thisfile_png_chunk_type_text['color_type']['palette'] = (bool) ($thisfile_png_chunk_type_text['raw']['color_type'] & 0x01); |
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80 | $thisfile_png_chunk_type_text['color_type']['true_color'] = (bool) ($thisfile_png_chunk_type_text['raw']['color_type'] & 0x02); |
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81 | $thisfile_png_chunk_type_text['color_type']['alpha'] = (bool) ($thisfile_png_chunk_type_text['raw']['color_type'] & 0x04); |
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82 | |
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83 | $ThisFileInfo['video']['resolution_x'] = $thisfile_png_chunk_type_text['width']; |
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84 | $ThisFileInfo['video']['resolution_y'] = $thisfile_png_chunk_type_text['height']; |
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85 | |
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86 | $ThisFileInfo['video']['bits_per_sample'] = $this->IHDRcalculateBitsPerSample($thisfile_png_chunk_type_text['raw']['color_type'], $thisfile_png_chunk_type_text['raw']['bit_depth']); |
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87 | break; |
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88 | |
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89 | |
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90 | case 'PLTE': // Palette |
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91 | $thisfile_png_chunk_type_text['header'] = $chunk; |
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92 | $paletteoffset = 0; |
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93 | for ($i = 0; $i <= 255; $i++) { |
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94 | //$thisfile_png_chunk_type_text['red'][$i] = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1)); |
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95 | //$thisfile_png_chunk_type_text['green'][$i] = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1)); |
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96 | //$thisfile_png_chunk_type_text['blue'][$i] = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1)); |
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97 | $red = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1)); |
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98 | $green = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1)); |
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99 | $blue = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1)); |
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100 | $thisfile_png_chunk_type_text[$i] = (($red << 16) | ($green << 8) | ($blue)); |
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101 | } |
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102 | break; |
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103 | |
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104 | |
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105 | case 'tRNS': // Transparency |
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106 | $thisfile_png_chunk_type_text['header'] = $chunk; |
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107 | switch ($thisfile_png['IHDR']['raw']['color_type']) { |
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108 | case 0: |
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109 | $thisfile_png_chunk_type_text['transparent_color_gray'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 2)); |
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110 | break; |
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111 | |
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112 | case 2: |
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113 | $thisfile_png_chunk_type_text['transparent_color_red'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 2)); |
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114 | $thisfile_png_chunk_type_text['transparent_color_green'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2, 2)); |
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115 | $thisfile_png_chunk_type_text['transparent_color_blue'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 2)); |
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116 | break; |
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117 | |
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118 | case 3: |
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119 | for ($i = 0; $i < strlen($chunk['data']); $i++) { |
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120 | $thisfile_png_chunk_type_text['palette_opacity'][$i] = getid3_lib::BigEndian2Int(substr($chunk['data'], $i, 1)); |
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121 | } |
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122 | break; |
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123 | |
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124 | case 4: |
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125 | case 6: |
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126 | $ThisFileInfo['error'][] = 'Invalid color_type in tRNS chunk: '.$thisfile_png['IHDR']['raw']['color_type']; |
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127 | |
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128 | default: |
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129 | $ThisFileInfo['warning'][] = 'Unhandled color_type in tRNS chunk: '.$thisfile_png['IHDR']['raw']['color_type']; |
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130 | break; |
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131 | } |
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132 | break; |
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133 | |
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134 | |
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135 | case 'gAMA': // Image Gamma |
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136 | $thisfile_png_chunk_type_text['header'] = $chunk; |
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137 | $thisfile_png_chunk_type_text['gamma'] = getid3_lib::BigEndian2Int($chunk['data']) / 100000; |
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138 | break; |
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139 | |
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140 | |
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141 | case 'cHRM': // Primary Chromaticities |
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142 | $thisfile_png_chunk_type_text['header'] = $chunk; |
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143 | $thisfile_png_chunk_type_text['white_x'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4)) / 100000; |
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144 | $thisfile_png_chunk_type_text['white_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4)) / 100000; |
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145 | $thisfile_png_chunk_type_text['red_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 8, 4)) / 100000; |
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146 | $thisfile_png_chunk_type_text['red_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 12, 4)) / 100000; |
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147 | $thisfile_png_chunk_type_text['green_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 16, 4)) / 100000; |
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148 | $thisfile_png_chunk_type_text['green_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 20, 4)) / 100000; |
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149 | $thisfile_png_chunk_type_text['blue_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 24, 4)) / 100000; |
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150 | $thisfile_png_chunk_type_text['blue_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 28, 4)) / 100000; |
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151 | break; |
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152 | |
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153 | |
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154 | case 'sRGB': // Standard RGB Color Space |
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155 | $thisfile_png_chunk_type_text['header'] = $chunk; |
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156 | $thisfile_png_chunk_type_text['reindering_intent'] = getid3_lib::BigEndian2Int($chunk['data']); |
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157 | $thisfile_png_chunk_type_text['reindering_intent_text'] = $this->PNGsRGBintentLookup($thisfile_png_chunk_type_text['reindering_intent']); |
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158 | break; |
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159 | |
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160 | |
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161 | case 'iCCP': // Embedded ICC Profile |
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162 | $thisfile_png_chunk_type_text['header'] = $chunk; |
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163 | list($profilename, $compressiondata) = explode("\x00", $chunk['data'], 2); |
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164 | $thisfile_png_chunk_type_text['profile_name'] = $profilename; |
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165 | $thisfile_png_chunk_type_text['compression_method'] = getid3_lib::BigEndian2Int(substr($compressiondata, 0, 1)); |
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166 | $thisfile_png_chunk_type_text['compression_profile'] = substr($compressiondata, 1); |
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167 | |
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168 | $thisfile_png_chunk_type_text['compression_method_text'] = $this->PNGcompressionMethodLookup($thisfile_png_chunk_type_text['compression_method']); |
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169 | break; |
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170 | |
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171 | |
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172 | case 'tEXt': // Textual Data |
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173 | $thisfile_png_chunk_type_text['header'] = $chunk; |
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174 | list($keyword, $text) = explode("\x00", $chunk['data'], 2); |
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175 | $thisfile_png_chunk_type_text['keyword'] = $keyword; |
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176 | $thisfile_png_chunk_type_text['text'] = $text; |
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177 | |
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178 | $thisfile_png['comments'][$thisfile_png_chunk_type_text['keyword']][] = $thisfile_png_chunk_type_text['text']; |
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179 | break; |
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180 | |
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181 | |
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182 | case 'zTXt': // Compressed Textual Data |
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183 | $thisfile_png_chunk_type_text['header'] = $chunk; |
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184 | list($keyword, $otherdata) = explode("\x00", $chunk['data'], 2); |
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185 | $thisfile_png_chunk_type_text['keyword'] = $keyword; |
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186 | $thisfile_png_chunk_type_text['compression_method'] = getid3_lib::BigEndian2Int(substr($otherdata, 0, 1)); |
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187 | $thisfile_png_chunk_type_text['compressed_text'] = substr($otherdata, 1); |
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188 | $thisfile_png_chunk_type_text['compression_method_text'] = $this->PNGcompressionMethodLookup($thisfile_png_chunk_type_text['compression_method']); |
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189 | switch ($thisfile_png_chunk_type_text['compression_method']) { |
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190 | case 0: |
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191 | $thisfile_png_chunk_type_text['text'] = gzuncompress($thisfile_png_chunk_type_text['compressed_text']); |
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192 | break; |
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193 | |
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194 | default: |
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195 | // unknown compression method |
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196 | break; |
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197 | } |
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198 | |
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199 | if (isset($thisfile_png_chunk_type_text['text'])) { |
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200 | $thisfile_png['comments'][$thisfile_png_chunk_type_text['keyword']][] = $thisfile_png_chunk_type_text['text']; |
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201 | } |
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202 | break; |
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203 | |
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204 | |
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205 | case 'iTXt': // International Textual Data |
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206 | $thisfile_png_chunk_type_text['header'] = $chunk; |
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207 | list($keyword, $otherdata) = explode("\x00", $chunk['data'], 2); |
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208 | $thisfile_png_chunk_type_text['keyword'] = $keyword; |
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209 | $thisfile_png_chunk_type_text['compression'] = (bool) getid3_lib::BigEndian2Int(substr($otherdata, 0, 1)); |
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210 | $thisfile_png_chunk_type_text['compression_method'] = getid3_lib::BigEndian2Int(substr($otherdata, 1, 1)); |
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211 | $thisfile_png_chunk_type_text['compression_method_text'] = $this->PNGcompressionMethodLookup($thisfile_png_chunk_type_text['compression_method']); |
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212 | list($languagetag, $translatedkeyword, $text) = explode("\x00", substr($otherdata, 2), 3); |
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213 | $thisfile_png_chunk_type_text['language_tag'] = $languagetag; |
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214 | $thisfile_png_chunk_type_text['translated_keyword'] = $translatedkeyword; |
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215 | |
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216 | if ($thisfile_png_chunk_type_text['compression']) { |
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217 | |
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218 | switch ($thisfile_png_chunk_type_text['compression_method']) { |
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219 | case 0: |
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220 | $thisfile_png_chunk_type_text['text'] = gzuncompress($text); |
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221 | break; |
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222 | |
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223 | default: |
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224 | // unknown compression method |
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225 | break; |
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226 | } |
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227 | |
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228 | } else { |
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229 | |
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230 | $thisfile_png_chunk_type_text['text'] = $text; |
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231 | |
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232 | } |
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233 | |
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234 | if (isset($thisfile_png_chunk_type_text['text'])) { |
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235 | $thisfile_png['comments'][$thisfile_png_chunk_type_text['keyword']][] = $thisfile_png_chunk_type_text['text']; |
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236 | } |
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237 | break; |
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238 | |
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239 | |
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240 | case 'bKGD': // Background Color |
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241 | $thisfile_png_chunk_type_text['header'] = $chunk; |
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242 | switch ($thisfile_png['IHDR']['raw']['color_type']) { |
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243 | case 0: |
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244 | case 4: |
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245 | $thisfile_png_chunk_type_text['background_gray'] = getid3_lib::BigEndian2Int($chunk['data']); |
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246 | break; |
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247 | |
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248 | case 2: |
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249 | case 6: |
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250 | $thisfile_png_chunk_type_text['background_red'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0 * $thisfile_png['IHDR']['raw']['bit_depth'], $thisfile_png['IHDR']['raw']['bit_depth'])); |
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251 | $thisfile_png_chunk_type_text['background_green'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 1 * $thisfile_png['IHDR']['raw']['bit_depth'], $thisfile_png['IHDR']['raw']['bit_depth'])); |
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252 | $thisfile_png_chunk_type_text['background_blue'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2 * $thisfile_png['IHDR']['raw']['bit_depth'], $thisfile_png['IHDR']['raw']['bit_depth'])); |
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253 | break; |
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254 | |
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255 | case 3: |
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256 | $thisfile_png_chunk_type_text['background_index'] = getid3_lib::BigEndian2Int($chunk['data']); |
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257 | break; |
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258 | |
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259 | default: |
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260 | break; |
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261 | } |
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262 | break; |
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263 | |
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264 | |
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265 | case 'pHYs': // Physical Pixel Dimensions |
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266 | $thisfile_png_chunk_type_text['header'] = $chunk; |
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267 | $thisfile_png_chunk_type_text['pixels_per_unit_x'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4)); |
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268 | $thisfile_png_chunk_type_text['pixels_per_unit_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4)); |
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269 | $thisfile_png_chunk_type_text['unit_specifier'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 8, 1)); |
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270 | $thisfile_png_chunk_type_text['unit'] = $this->PNGpHYsUnitLookup($thisfile_png_chunk_type_text['unit_specifier']); |
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271 | break; |
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272 | |
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273 | |
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274 | case 'sBIT': // Significant Bits |
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275 | $thisfile_png_chunk_type_text['header'] = $chunk; |
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276 | switch ($thisfile_png['IHDR']['raw']['color_type']) { |
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277 | case 0: |
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278 | $thisfile_png_chunk_type_text['significant_bits_gray'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1)); |
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279 | break; |
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280 | |
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281 | case 2: |
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282 | case 3: |
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283 | $thisfile_png_chunk_type_text['significant_bits_red'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1)); |
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284 | $thisfile_png_chunk_type_text['significant_bits_green'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 1, 1)); |
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285 | $thisfile_png_chunk_type_text['significant_bits_blue'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2, 1)); |
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286 | break; |
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287 | |
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288 | case 4: |
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289 | $thisfile_png_chunk_type_text['significant_bits_gray'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1)); |
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290 | $thisfile_png_chunk_type_text['significant_bits_alpha'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 1, 1)); |
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291 | break; |
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292 | |
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293 | case 6: |
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294 | $thisfile_png_chunk_type_text['significant_bits_red'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1)); |
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295 | $thisfile_png_chunk_type_text['significant_bits_green'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 1, 1)); |
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296 | $thisfile_png_chunk_type_text['significant_bits_blue'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2, 1)); |
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297 | $thisfile_png_chunk_type_text['significant_bits_alpha'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 3, 1)); |
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298 | break; |
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299 | |
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300 | default: |
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301 | break; |
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302 | } |
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303 | break; |
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304 | |
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305 | |
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306 | case 'sPLT': // Suggested Palette |
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307 | $thisfile_png_chunk_type_text['header'] = $chunk; |
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308 | list($palettename, $otherdata) = explode("\x00", $chunk['data'], 2); |
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309 | $thisfile_png_chunk_type_text['palette_name'] = $palettename; |
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310 | $sPLToffset = 0; |
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311 | $thisfile_png_chunk_type_text['sample_depth_bits'] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, 1)); |
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312 | $sPLToffset += 1; |
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313 | $thisfile_png_chunk_type_text['sample_depth_bytes'] = $thisfile_png_chunk_type_text['sample_depth_bits'] / 8; |
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314 | $paletteCounter = 0; |
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315 | while ($sPLToffset < strlen($otherdata)) { |
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316 | $thisfile_png_chunk_type_text['red'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, $thisfile_png_chunk_type_text['sample_depth_bytes'])); |
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317 | $sPLToffset += $thisfile_png_chunk_type_text['sample_depth_bytes']; |
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318 | $thisfile_png_chunk_type_text['green'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, $thisfile_png_chunk_type_text['sample_depth_bytes'])); |
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319 | $sPLToffset += $thisfile_png_chunk_type_text['sample_depth_bytes']; |
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320 | $thisfile_png_chunk_type_text['blue'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, $thisfile_png_chunk_type_text['sample_depth_bytes'])); |
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321 | $sPLToffset += $thisfile_png_chunk_type_text['sample_depth_bytes']; |
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322 | $thisfile_png_chunk_type_text['alpha'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, $thisfile_png_chunk_type_text['sample_depth_bytes'])); |
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323 | $sPLToffset += $thisfile_png_chunk_type_text['sample_depth_bytes']; |
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324 | $thisfile_png_chunk_type_text['frequency'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, 2)); |
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325 | $sPLToffset += 2; |
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326 | $paletteCounter++; |
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327 | } |
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328 | break; |
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329 | |
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330 | |
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331 | case 'hIST': // Palette Histogram |
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332 | $thisfile_png_chunk_type_text['header'] = $chunk; |
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333 | $hISTcounter = 0; |
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334 | while ($hISTcounter < strlen($chunk['data'])) { |
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335 | $thisfile_png_chunk_type_text[$hISTcounter] = getid3_lib::BigEndian2Int(substr($chunk['data'], $hISTcounter / 2, 2)); |
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336 | $hISTcounter += 2; |
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337 | } |
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338 | break; |
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339 | |
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340 | |
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341 | case 'tIME': // Image Last-Modification Time |
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342 | $thisfile_png_chunk_type_text['header'] = $chunk; |
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343 | $thisfile_png_chunk_type_text['year'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 2)); |
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344 | $thisfile_png_chunk_type_text['month'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2, 1)); |
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345 | $thisfile_png_chunk_type_text['day'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 3, 1)); |
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346 | $thisfile_png_chunk_type_text['hour'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 1)); |
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347 | $thisfile_png_chunk_type_text['minute'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 5, 1)); |
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348 | $thisfile_png_chunk_type_text['second'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 6, 1)); |
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349 | $thisfile_png_chunk_type_text['unix'] = gmmktime($thisfile_png_chunk_type_text['hour'], $thisfile_png_chunk_type_text['minute'], $thisfile_png_chunk_type_text['second'], $thisfile_png_chunk_type_text['month'], $thisfile_png_chunk_type_text['day'], $thisfile_png_chunk_type_text['year']); |
---|
350 | break; |
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351 | |
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352 | |
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353 | case 'oFFs': // Image Offset |
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354 | $thisfile_png_chunk_type_text['header'] = $chunk; |
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355 | $thisfile_png_chunk_type_text['position_x'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4), false, true); |
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356 | $thisfile_png_chunk_type_text['position_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4), false, true); |
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357 | $thisfile_png_chunk_type_text['unit_specifier'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 8, 1)); |
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358 | $thisfile_png_chunk_type_text['unit'] = $this->PNGoFFsUnitLookup($thisfile_png_chunk_type_text['unit_specifier']); |
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359 | break; |
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360 | |
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361 | |
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362 | case 'pCAL': // Calibration Of Pixel Values |
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363 | $thisfile_png_chunk_type_text['header'] = $chunk; |
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364 | list($calibrationname, $otherdata) = explode("\x00", $chunk['data'], 2); |
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365 | $thisfile_png_chunk_type_text['calibration_name'] = $calibrationname; |
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366 | $pCALoffset = 0; |
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367 | $thisfile_png_chunk_type_text['original_zero'] = getid3_lib::BigEndian2Int(substr($chunk['data'], $pCALoffset, 4), false, true); |
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368 | $pCALoffset += 4; |
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369 | $thisfile_png_chunk_type_text['original_max'] = getid3_lib::BigEndian2Int(substr($chunk['data'], $pCALoffset, 4), false, true); |
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370 | $pCALoffset += 4; |
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371 | $thisfile_png_chunk_type_text['equation_type'] = getid3_lib::BigEndian2Int(substr($chunk['data'], $pCALoffset, 1)); |
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372 | $pCALoffset += 1; |
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373 | $thisfile_png_chunk_type_text['equation_type_text'] = $this->PNGpCALequationTypeLookup($thisfile_png_chunk_type_text['equation_type']); |
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374 | $thisfile_png_chunk_type_text['parameter_count'] = getid3_lib::BigEndian2Int(substr($chunk['data'], $pCALoffset, 1)); |
---|
375 | $pCALoffset += 1; |
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376 | $thisfile_png_chunk_type_text['parameters'] = explode("\x00", substr($chunk['data'], $pCALoffset)); |
---|
377 | break; |
---|
378 | |
---|
379 | |
---|
380 | case 'sCAL': // Physical Scale Of Image Subject |
---|
381 | $thisfile_png_chunk_type_text['header'] = $chunk; |
---|
382 | $thisfile_png_chunk_type_text['unit_specifier'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1)); |
---|
383 | $thisfile_png_chunk_type_text['unit'] = $this->PNGsCALUnitLookup($thisfile_png_chunk_type_text['unit_specifier']); |
---|
384 | list($pixelwidth, $pixelheight) = explode("\x00", substr($chunk['data'], 1)); |
---|
385 | $thisfile_png_chunk_type_text['pixel_width'] = $pixelwidth; |
---|
386 | $thisfile_png_chunk_type_text['pixel_height'] = $pixelheight; |
---|
387 | break; |
---|
388 | |
---|
389 | |
---|
390 | case 'gIFg': // GIF Graphic Control Extension |
---|
391 | $gIFgCounter = 0; |
---|
392 | if (isset($thisfile_png_chunk_type_text) && is_array($thisfile_png_chunk_type_text)) { |
---|
393 | $gIFgCounter = count($thisfile_png_chunk_type_text); |
---|
394 | } |
---|
395 | $thisfile_png_chunk_type_text[$gIFgCounter]['header'] = $chunk; |
---|
396 | $thisfile_png_chunk_type_text[$gIFgCounter]['disposal_method'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1)); |
---|
397 | $thisfile_png_chunk_type_text[$gIFgCounter]['user_input_flag'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 1, 1)); |
---|
398 | $thisfile_png_chunk_type_text[$gIFgCounter]['delay_time'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2, 2)); |
---|
399 | break; |
---|
400 | |
---|
401 | |
---|
402 | case 'gIFx': // GIF Application Extension |
---|
403 | $gIFxCounter = 0; |
---|
404 | if (isset($thisfile_png_chunk_type_text) && is_array($thisfile_png_chunk_type_text)) { |
---|
405 | $gIFxCounter = count($thisfile_png_chunk_type_text); |
---|
406 | } |
---|
407 | $thisfile_png_chunk_type_text[$gIFxCounter]['header'] = $chunk; |
---|
408 | $thisfile_png_chunk_type_text[$gIFxCounter]['application_identifier'] = substr($chunk['data'], 0, 8); |
---|
409 | $thisfile_png_chunk_type_text[$gIFxCounter]['authentication_code'] = substr($chunk['data'], 8, 3); |
---|
410 | $thisfile_png_chunk_type_text[$gIFxCounter]['application_data'] = substr($chunk['data'], 11); |
---|
411 | break; |
---|
412 | |
---|
413 | |
---|
414 | case 'IDAT': // Image Data |
---|
415 | $idatinformationfieldindex = 0; |
---|
416 | if (isset($thisfile_png['IDAT']) && is_array($thisfile_png['IDAT'])) { |
---|
417 | $idatinformationfieldindex = count($thisfile_png['IDAT']); |
---|
418 | } |
---|
419 | unset($chunk['data']); |
---|
420 | $thisfile_png_chunk_type_text[$idatinformationfieldindex]['header'] = $chunk; |
---|
421 | break; |
---|
422 | |
---|
423 | |
---|
424 | case 'IEND': // Image Trailer |
---|
425 | $thisfile_png_chunk_type_text['header'] = $chunk; |
---|
426 | break; |
---|
427 | |
---|
428 | |
---|
429 | default: |
---|
430 | //unset($chunk['data']); |
---|
431 | $thisfile_png_chunk_type_text['header'] = $chunk; |
---|
432 | $ThisFileInfo['warning'][] = 'Unhandled chunk type: '.$chunk['type_text']; |
---|
433 | break; |
---|
434 | } |
---|
435 | } |
---|
436 | |
---|
437 | return true; |
---|
438 | } |
---|
439 | |
---|
440 | function PNGsRGBintentLookup($sRGB) { |
---|
441 | static $PNGsRGBintentLookup = array( |
---|
442 | 0 => 'Perceptual', |
---|
443 | 1 => 'Relative colorimetric', |
---|
444 | 2 => 'Saturation', |
---|
445 | 3 => 'Absolute colorimetric' |
---|
446 | ); |
---|
447 | return (isset($PNGsRGBintentLookup[$sRGB]) ? $PNGsRGBintentLookup[$sRGB] : 'invalid'); |
---|
448 | } |
---|
449 | |
---|
450 | function PNGcompressionMethodLookup($compressionmethod) { |
---|
451 | static $PNGcompressionMethodLookup = array( |
---|
452 | 0 => 'deflate/inflate' |
---|
453 | ); |
---|
454 | return (isset($PNGcompressionMethodLookup[$compressionmethod]) ? $PNGcompressionMethodLookup[$compressionmethod] : 'invalid'); |
---|
455 | } |
---|
456 | |
---|
457 | function PNGpHYsUnitLookup($unitid) { |
---|
458 | static $PNGpHYsUnitLookup = array( |
---|
459 | 0 => 'unknown', |
---|
460 | 1 => 'meter' |
---|
461 | ); |
---|
462 | return (isset($PNGpHYsUnitLookup[$unitid]) ? $PNGpHYsUnitLookup[$unitid] : 'invalid'); |
---|
463 | } |
---|
464 | |
---|
465 | function PNGoFFsUnitLookup($unitid) { |
---|
466 | static $PNGoFFsUnitLookup = array( |
---|
467 | 0 => 'pixel', |
---|
468 | 1 => 'micrometer' |
---|
469 | ); |
---|
470 | return (isset($PNGoFFsUnitLookup[$unitid]) ? $PNGoFFsUnitLookup[$unitid] : 'invalid'); |
---|
471 | } |
---|
472 | |
---|
473 | function PNGpCALequationTypeLookup($equationtype) { |
---|
474 | static $PNGpCALequationTypeLookup = array( |
---|
475 | 0 => 'Linear mapping', |
---|
476 | 1 => 'Base-e exponential mapping', |
---|
477 | 2 => 'Arbitrary-base exponential mapping', |
---|
478 | 3 => 'Hyperbolic mapping' |
---|
479 | ); |
---|
480 | return (isset($PNGpCALequationTypeLookup[$equationtype]) ? $PNGpCALequationTypeLookup[$equationtype] : 'invalid'); |
---|
481 | } |
---|
482 | |
---|
483 | function PNGsCALUnitLookup($unitid) { |
---|
484 | static $PNGsCALUnitLookup = array( |
---|
485 | 0 => 'meter', |
---|
486 | 1 => 'radian' |
---|
487 | ); |
---|
488 | return (isset($PNGsCALUnitLookup[$unitid]) ? $PNGsCALUnitLookup[$unitid] : 'invalid'); |
---|
489 | } |
---|
490 | |
---|
491 | function IHDRcalculateBitsPerSample($color_type, $bit_depth) { |
---|
492 | switch ($color_type) { |
---|
493 | case 0: // Each pixel is a grayscale sample. |
---|
494 | return $bit_depth; |
---|
495 | break; |
---|
496 | |
---|
497 | case 2: // Each pixel is an R,G,B triple |
---|
498 | return 3 * $bit_depth; |
---|
499 | break; |
---|
500 | |
---|
501 | case 3: // Each pixel is a palette index; a PLTE chunk must appear. |
---|
502 | return $bit_depth; |
---|
503 | break; |
---|
504 | |
---|
505 | case 4: // Each pixel is a grayscale sample, followed by an alpha sample. |
---|
506 | return 2 * $bit_depth; |
---|
507 | break; |
---|
508 | |
---|
509 | case 6: // Each pixel is an R,G,B triple, followed by an alpha sample. |
---|
510 | return 4 * $bit_depth; |
---|
511 | break; |
---|
512 | } |
---|
513 | return false; |
---|
514 | } |
---|
515 | |
---|
516 | } |
---|
517 | |
---|
518 | |
---|
519 | ?> |
---|