File indexing completed on 2024-05-12 17:26:00
0001 <?php 0002 ///////////////////////////////////////////////////////////////// 0003 /// getID3() by James Heinrich <info@getid3.org> // 0004 // available at http://getid3.sourceforge.net // 0005 // or http://www.getid3.org // 0006 // also https://github.com/JamesHeinrich/getID3 // 0007 ///////////////////////////////////////////////////////////////// 0008 // See readme.txt for more details // 0009 ///////////////////////////////////////////////////////////////// 0010 // // 0011 // module.graphic.png.php // 0012 // module for analyzing PNG Image files // 0013 // dependencies: NONE // 0014 // /// 0015 ///////////////////////////////////////////////////////////////// 0016 0017 0018 class getid3_png extends getid3_handler 0019 { 0020 0021 public function Analyze() { 0022 $info = &$this->getid3->info; 0023 0024 // shortcut 0025 $info['png'] = array(); 0026 $thisfile_png = &$info['png']; 0027 0028 $info['fileformat'] = 'png'; 0029 $info['video']['dataformat'] = 'png'; 0030 $info['video']['lossless'] = false; 0031 0032 $this->fseek($info['avdataoffset']); 0033 $PNGfiledata = $this->fread($this->getid3->fread_buffer_size()); 0034 $offset = 0; 0035 0036 $PNGidentifier = substr($PNGfiledata, $offset, 8); // $89 $50 $4E $47 $0D $0A $1A $0A 0037 $offset += 8; 0038 0039 if ($PNGidentifier != "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A") { 0040 $info['error'][] = 'First 8 bytes of file ('.getid3_lib::PrintHexBytes($PNGidentifier).') did not match expected PNG identifier'; 0041 unset($info['fileformat']); 0042 return false; 0043 } 0044 0045 while ((($this->ftell() - (strlen($PNGfiledata) - $offset)) < $info['filesize'])) { 0046 $chunk['data_length'] = getid3_lib::BigEndian2Int(substr($PNGfiledata, $offset, 4)); 0047 $offset += 4; 0048 while (((strlen($PNGfiledata) - $offset) < ($chunk['data_length'] + 4)) && ($this->ftell() < $info['filesize'])) { 0049 $PNGfiledata .= $this->fread($this->getid3->fread_buffer_size()); 0050 } 0051 $chunk['type_text'] = substr($PNGfiledata, $offset, 4); 0052 $offset += 4; 0053 $chunk['type_raw'] = getid3_lib::BigEndian2Int($chunk['type_text']); 0054 $chunk['data'] = substr($PNGfiledata, $offset, $chunk['data_length']); 0055 $offset += $chunk['data_length']; 0056 $chunk['crc'] = getid3_lib::BigEndian2Int(substr($PNGfiledata, $offset, 4)); 0057 $offset += 4; 0058 0059 $chunk['flags']['ancilliary'] = (bool) ($chunk['type_raw'] & 0x20000000); 0060 $chunk['flags']['private'] = (bool) ($chunk['type_raw'] & 0x00200000); 0061 $chunk['flags']['reserved'] = (bool) ($chunk['type_raw'] & 0x00002000); 0062 $chunk['flags']['safe_to_copy'] = (bool) ($chunk['type_raw'] & 0x00000020); 0063 0064 // shortcut 0065 $thisfile_png[$chunk['type_text']] = array(); 0066 $thisfile_png_chunk_type_text = &$thisfile_png[$chunk['type_text']]; 0067 0068 switch ($chunk['type_text']) { 0069 0070 case 'IHDR': // Image Header 0071 $thisfile_png_chunk_type_text['header'] = $chunk; 0072 $thisfile_png_chunk_type_text['width'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4)); 0073 $thisfile_png_chunk_type_text['height'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4)); 0074 $thisfile_png_chunk_type_text['raw']['bit_depth'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 8, 1)); 0075 $thisfile_png_chunk_type_text['raw']['color_type'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 9, 1)); 0076 $thisfile_png_chunk_type_text['raw']['compression_method'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 10, 1)); 0077 $thisfile_png_chunk_type_text['raw']['filter_method'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 11, 1)); 0078 $thisfile_png_chunk_type_text['raw']['interlace_method'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 12, 1)); 0079 0080 $thisfile_png_chunk_type_text['compression_method_text'] = $this->PNGcompressionMethodLookup($thisfile_png_chunk_type_text['raw']['compression_method']); 0081 $thisfile_png_chunk_type_text['color_type']['palette'] = (bool) ($thisfile_png_chunk_type_text['raw']['color_type'] & 0x01); 0082 $thisfile_png_chunk_type_text['color_type']['true_color'] = (bool) ($thisfile_png_chunk_type_text['raw']['color_type'] & 0x02); 0083 $thisfile_png_chunk_type_text['color_type']['alpha'] = (bool) ($thisfile_png_chunk_type_text['raw']['color_type'] & 0x04); 0084 0085 $info['video']['resolution_x'] = $thisfile_png_chunk_type_text['width']; 0086 $info['video']['resolution_y'] = $thisfile_png_chunk_type_text['height']; 0087 0088 $info['video']['bits_per_sample'] = $this->IHDRcalculateBitsPerSample($thisfile_png_chunk_type_text['raw']['color_type'], $thisfile_png_chunk_type_text['raw']['bit_depth']); 0089 break; 0090 0091 0092 case 'PLTE': // Palette 0093 $thisfile_png_chunk_type_text['header'] = $chunk; 0094 $paletteoffset = 0; 0095 for ($i = 0; $i <= 255; $i++) { 0096 //$thisfile_png_chunk_type_text['red'][$i] = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1)); 0097 //$thisfile_png_chunk_type_text['green'][$i] = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1)); 0098 //$thisfile_png_chunk_type_text['blue'][$i] = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1)); 0099 $red = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1)); 0100 $green = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1)); 0101 $blue = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1)); 0102 $thisfile_png_chunk_type_text[$i] = (($red << 16) | ($green << 8) | ($blue)); 0103 } 0104 break; 0105 0106 0107 case 'tRNS': // Transparency 0108 $thisfile_png_chunk_type_text['header'] = $chunk; 0109 switch ($thisfile_png['IHDR']['raw']['color_type']) { 0110 case 0: 0111 $thisfile_png_chunk_type_text['transparent_color_gray'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 2)); 0112 break; 0113 0114 case 2: 0115 $thisfile_png_chunk_type_text['transparent_color_red'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 2)); 0116 $thisfile_png_chunk_type_text['transparent_color_green'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2, 2)); 0117 $thisfile_png_chunk_type_text['transparent_color_blue'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 2)); 0118 break; 0119 0120 case 3: 0121 for ($i = 0; $i < strlen($chunk['data']); $i++) { 0122 $thisfile_png_chunk_type_text['palette_opacity'][$i] = getid3_lib::BigEndian2Int(substr($chunk['data'], $i, 1)); 0123 } 0124 break; 0125 0126 case 4: 0127 case 6: 0128 $info['error'][] = 'Invalid color_type in tRNS chunk: '.$thisfile_png['IHDR']['raw']['color_type']; 0129 0130 default: 0131 $info['warning'][] = 'Unhandled color_type in tRNS chunk: '.$thisfile_png['IHDR']['raw']['color_type']; 0132 break; 0133 } 0134 break; 0135 0136 0137 case 'gAMA': // Image Gamma 0138 $thisfile_png_chunk_type_text['header'] = $chunk; 0139 $thisfile_png_chunk_type_text['gamma'] = getid3_lib::BigEndian2Int($chunk['data']) / 100000; 0140 break; 0141 0142 0143 case 'cHRM': // Primary Chromaticities 0144 $thisfile_png_chunk_type_text['header'] = $chunk; 0145 $thisfile_png_chunk_type_text['white_x'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4)) / 100000; 0146 $thisfile_png_chunk_type_text['white_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4)) / 100000; 0147 $thisfile_png_chunk_type_text['red_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 8, 4)) / 100000; 0148 $thisfile_png_chunk_type_text['red_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 12, 4)) / 100000; 0149 $thisfile_png_chunk_type_text['green_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 16, 4)) / 100000; 0150 $thisfile_png_chunk_type_text['green_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 20, 4)) / 100000; 0151 $thisfile_png_chunk_type_text['blue_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 24, 4)) / 100000; 0152 $thisfile_png_chunk_type_text['blue_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 28, 4)) / 100000; 0153 break; 0154 0155 0156 case 'sRGB': // Standard RGB Color Space 0157 $thisfile_png_chunk_type_text['header'] = $chunk; 0158 $thisfile_png_chunk_type_text['reindering_intent'] = getid3_lib::BigEndian2Int($chunk['data']); 0159 $thisfile_png_chunk_type_text['reindering_intent_text'] = $this->PNGsRGBintentLookup($thisfile_png_chunk_type_text['reindering_intent']); 0160 break; 0161 0162 0163 case 'iCCP': // Embedded ICC Profile 0164 $thisfile_png_chunk_type_text['header'] = $chunk; 0165 list($profilename, $compressiondata) = explode("\x00", $chunk['data'], 2); 0166 $thisfile_png_chunk_type_text['profile_name'] = $profilename; 0167 $thisfile_png_chunk_type_text['compression_method'] = getid3_lib::BigEndian2Int(substr($compressiondata, 0, 1)); 0168 $thisfile_png_chunk_type_text['compression_profile'] = substr($compressiondata, 1); 0169 0170 $thisfile_png_chunk_type_text['compression_method_text'] = $this->PNGcompressionMethodLookup($thisfile_png_chunk_type_text['compression_method']); 0171 break; 0172 0173 0174 case 'tEXt': // Textual Data 0175 $thisfile_png_chunk_type_text['header'] = $chunk; 0176 list($keyword, $text) = explode("\x00", $chunk['data'], 2); 0177 $thisfile_png_chunk_type_text['keyword'] = $keyword; 0178 $thisfile_png_chunk_type_text['text'] = $text; 0179 0180 $thisfile_png['comments'][$thisfile_png_chunk_type_text['keyword']][] = $thisfile_png_chunk_type_text['text']; 0181 break; 0182 0183 0184 case 'zTXt': // Compressed Textual Data 0185 $thisfile_png_chunk_type_text['header'] = $chunk; 0186 list($keyword, $otherdata) = explode("\x00", $chunk['data'], 2); 0187 $thisfile_png_chunk_type_text['keyword'] = $keyword; 0188 $thisfile_png_chunk_type_text['compression_method'] = getid3_lib::BigEndian2Int(substr($otherdata, 0, 1)); 0189 $thisfile_png_chunk_type_text['compressed_text'] = substr($otherdata, 1); 0190 $thisfile_png_chunk_type_text['compression_method_text'] = $this->PNGcompressionMethodLookup($thisfile_png_chunk_type_text['compression_method']); 0191 switch ($thisfile_png_chunk_type_text['compression_method']) { 0192 case 0: 0193 $thisfile_png_chunk_type_text['text'] = gzuncompress($thisfile_png_chunk_type_text['compressed_text']); 0194 break; 0195 0196 default: 0197 // unknown compression method 0198 break; 0199 } 0200 0201 if (isset($thisfile_png_chunk_type_text['text'])) { 0202 $thisfile_png['comments'][$thisfile_png_chunk_type_text['keyword']][] = $thisfile_png_chunk_type_text['text']; 0203 } 0204 break; 0205 0206 0207 case 'iTXt': // International Textual Data 0208 $thisfile_png_chunk_type_text['header'] = $chunk; 0209 list($keyword, $otherdata) = explode("\x00", $chunk['data'], 2); 0210 $thisfile_png_chunk_type_text['keyword'] = $keyword; 0211 $thisfile_png_chunk_type_text['compression'] = (bool) getid3_lib::BigEndian2Int(substr($otherdata, 0, 1)); 0212 $thisfile_png_chunk_type_text['compression_method'] = getid3_lib::BigEndian2Int(substr($otherdata, 1, 1)); 0213 $thisfile_png_chunk_type_text['compression_method_text'] = $this->PNGcompressionMethodLookup($thisfile_png_chunk_type_text['compression_method']); 0214 list($languagetag, $translatedkeyword, $text) = explode("\x00", substr($otherdata, 2), 3); 0215 $thisfile_png_chunk_type_text['language_tag'] = $languagetag; 0216 $thisfile_png_chunk_type_text['translated_keyword'] = $translatedkeyword; 0217 0218 if ($thisfile_png_chunk_type_text['compression']) { 0219 0220 switch ($thisfile_png_chunk_type_text['compression_method']) { 0221 case 0: 0222 $thisfile_png_chunk_type_text['text'] = gzuncompress($text); 0223 break; 0224 0225 default: 0226 // unknown compression method 0227 break; 0228 } 0229 0230 } else { 0231 0232 $thisfile_png_chunk_type_text['text'] = $text; 0233 0234 } 0235 0236 if (isset($thisfile_png_chunk_type_text['text'])) { 0237 $thisfile_png['comments'][$thisfile_png_chunk_type_text['keyword']][] = $thisfile_png_chunk_type_text['text']; 0238 } 0239 break; 0240 0241 0242 case 'bKGD': // Background Color 0243 $thisfile_png_chunk_type_text['header'] = $chunk; 0244 switch ($thisfile_png['IHDR']['raw']['color_type']) { 0245 case 0: 0246 case 4: 0247 $thisfile_png_chunk_type_text['background_gray'] = getid3_lib::BigEndian2Int($chunk['data']); 0248 break; 0249 0250 case 2: 0251 case 6: 0252 $thisfile_png_chunk_type_text['background_red'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0 * $thisfile_png['IHDR']['raw']['bit_depth'], $thisfile_png['IHDR']['raw']['bit_depth'])); 0253 $thisfile_png_chunk_type_text['background_green'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 1 * $thisfile_png['IHDR']['raw']['bit_depth'], $thisfile_png['IHDR']['raw']['bit_depth'])); 0254 $thisfile_png_chunk_type_text['background_blue'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2 * $thisfile_png['IHDR']['raw']['bit_depth'], $thisfile_png['IHDR']['raw']['bit_depth'])); 0255 break; 0256 0257 case 3: 0258 $thisfile_png_chunk_type_text['background_index'] = getid3_lib::BigEndian2Int($chunk['data']); 0259 break; 0260 0261 default: 0262 break; 0263 } 0264 break; 0265 0266 0267 case 'pHYs': // Physical Pixel Dimensions 0268 $thisfile_png_chunk_type_text['header'] = $chunk; 0269 $thisfile_png_chunk_type_text['pixels_per_unit_x'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4)); 0270 $thisfile_png_chunk_type_text['pixels_per_unit_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4)); 0271 $thisfile_png_chunk_type_text['unit_specifier'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 8, 1)); 0272 $thisfile_png_chunk_type_text['unit'] = $this->PNGpHYsUnitLookup($thisfile_png_chunk_type_text['unit_specifier']); 0273 break; 0274 0275 0276 case 'sBIT': // Significant Bits 0277 $thisfile_png_chunk_type_text['header'] = $chunk; 0278 switch ($thisfile_png['IHDR']['raw']['color_type']) { 0279 case 0: 0280 $thisfile_png_chunk_type_text['significant_bits_gray'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1)); 0281 break; 0282 0283 case 2: 0284 case 3: 0285 $thisfile_png_chunk_type_text['significant_bits_red'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1)); 0286 $thisfile_png_chunk_type_text['significant_bits_green'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 1, 1)); 0287 $thisfile_png_chunk_type_text['significant_bits_blue'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2, 1)); 0288 break; 0289 0290 case 4: 0291 $thisfile_png_chunk_type_text['significant_bits_gray'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1)); 0292 $thisfile_png_chunk_type_text['significant_bits_alpha'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 1, 1)); 0293 break; 0294 0295 case 6: 0296 $thisfile_png_chunk_type_text['significant_bits_red'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1)); 0297 $thisfile_png_chunk_type_text['significant_bits_green'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 1, 1)); 0298 $thisfile_png_chunk_type_text['significant_bits_blue'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2, 1)); 0299 $thisfile_png_chunk_type_text['significant_bits_alpha'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 3, 1)); 0300 break; 0301 0302 default: 0303 break; 0304 } 0305 break; 0306 0307 0308 case 'sPLT': // Suggested Palette 0309 $thisfile_png_chunk_type_text['header'] = $chunk; 0310 list($palettename, $otherdata) = explode("\x00", $chunk['data'], 2); 0311 $thisfile_png_chunk_type_text['palette_name'] = $palettename; 0312 $sPLToffset = 0; 0313 $thisfile_png_chunk_type_text['sample_depth_bits'] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, 1)); 0314 $sPLToffset += 1; 0315 $thisfile_png_chunk_type_text['sample_depth_bytes'] = $thisfile_png_chunk_type_text['sample_depth_bits'] / 8; 0316 $paletteCounter = 0; 0317 while ($sPLToffset < strlen($otherdata)) { 0318 $thisfile_png_chunk_type_text['red'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, $thisfile_png_chunk_type_text['sample_depth_bytes'])); 0319 $sPLToffset += $thisfile_png_chunk_type_text['sample_depth_bytes']; 0320 $thisfile_png_chunk_type_text['green'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, $thisfile_png_chunk_type_text['sample_depth_bytes'])); 0321 $sPLToffset += $thisfile_png_chunk_type_text['sample_depth_bytes']; 0322 $thisfile_png_chunk_type_text['blue'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, $thisfile_png_chunk_type_text['sample_depth_bytes'])); 0323 $sPLToffset += $thisfile_png_chunk_type_text['sample_depth_bytes']; 0324 $thisfile_png_chunk_type_text['alpha'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, $thisfile_png_chunk_type_text['sample_depth_bytes'])); 0325 $sPLToffset += $thisfile_png_chunk_type_text['sample_depth_bytes']; 0326 $thisfile_png_chunk_type_text['frequency'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, 2)); 0327 $sPLToffset += 2; 0328 $paletteCounter++; 0329 } 0330 break; 0331 0332 0333 case 'hIST': // Palette Histogram 0334 $thisfile_png_chunk_type_text['header'] = $chunk; 0335 $hISTcounter = 0; 0336 while ($hISTcounter < strlen($chunk['data'])) { 0337 $thisfile_png_chunk_type_text[$hISTcounter] = getid3_lib::BigEndian2Int(substr($chunk['data'], $hISTcounter / 2, 2)); 0338 $hISTcounter += 2; 0339 } 0340 break; 0341 0342 0343 case 'tIME': // Image Last-Modification Time 0344 $thisfile_png_chunk_type_text['header'] = $chunk; 0345 $thisfile_png_chunk_type_text['year'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 2)); 0346 $thisfile_png_chunk_type_text['month'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2, 1)); 0347 $thisfile_png_chunk_type_text['day'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 3, 1)); 0348 $thisfile_png_chunk_type_text['hour'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 1)); 0349 $thisfile_png_chunk_type_text['minute'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 5, 1)); 0350 $thisfile_png_chunk_type_text['second'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 6, 1)); 0351 $thisfile_png_chunk_type_text['unix'] = gmmktime($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']); 0352 break; 0353 0354 0355 case 'oFFs': // Image Offset 0356 $thisfile_png_chunk_type_text['header'] = $chunk; 0357 $thisfile_png_chunk_type_text['position_x'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4), false, true); 0358 $thisfile_png_chunk_type_text['position_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4), false, true); 0359 $thisfile_png_chunk_type_text['unit_specifier'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 8, 1)); 0360 $thisfile_png_chunk_type_text['unit'] = $this->PNGoFFsUnitLookup($thisfile_png_chunk_type_text['unit_specifier']); 0361 break; 0362 0363 0364 case 'pCAL': // Calibration Of Pixel Values 0365 $thisfile_png_chunk_type_text['header'] = $chunk; 0366 list($calibrationname, $otherdata) = explode("\x00", $chunk['data'], 2); 0367 $thisfile_png_chunk_type_text['calibration_name'] = $calibrationname; 0368 $pCALoffset = 0; 0369 $thisfile_png_chunk_type_text['original_zero'] = getid3_lib::BigEndian2Int(substr($chunk['data'], $pCALoffset, 4), false, true); 0370 $pCALoffset += 4; 0371 $thisfile_png_chunk_type_text['original_max'] = getid3_lib::BigEndian2Int(substr($chunk['data'], $pCALoffset, 4), false, true); 0372 $pCALoffset += 4; 0373 $thisfile_png_chunk_type_text['equation_type'] = getid3_lib::BigEndian2Int(substr($chunk['data'], $pCALoffset, 1)); 0374 $pCALoffset += 1; 0375 $thisfile_png_chunk_type_text['equation_type_text'] = $this->PNGpCALequationTypeLookup($thisfile_png_chunk_type_text['equation_type']); 0376 $thisfile_png_chunk_type_text['parameter_count'] = getid3_lib::BigEndian2Int(substr($chunk['data'], $pCALoffset, 1)); 0377 $pCALoffset += 1; 0378 $thisfile_png_chunk_type_text['parameters'] = explode("\x00", substr($chunk['data'], $pCALoffset)); 0379 break; 0380 0381 0382 case 'sCAL': // Physical Scale Of Image Subject 0383 $thisfile_png_chunk_type_text['header'] = $chunk; 0384 $thisfile_png_chunk_type_text['unit_specifier'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1)); 0385 $thisfile_png_chunk_type_text['unit'] = $this->PNGsCALUnitLookup($thisfile_png_chunk_type_text['unit_specifier']); 0386 list($pixelwidth, $pixelheight) = explode("\x00", substr($chunk['data'], 1)); 0387 $thisfile_png_chunk_type_text['pixel_width'] = $pixelwidth; 0388 $thisfile_png_chunk_type_text['pixel_height'] = $pixelheight; 0389 break; 0390 0391 0392 case 'gIFg': // GIF Graphic Control Extension 0393 $gIFgCounter = 0; 0394 if (isset($thisfile_png_chunk_type_text) && is_array($thisfile_png_chunk_type_text)) { 0395 $gIFgCounter = count($thisfile_png_chunk_type_text); 0396 } 0397 $thisfile_png_chunk_type_text[$gIFgCounter]['header'] = $chunk; 0398 $thisfile_png_chunk_type_text[$gIFgCounter]['disposal_method'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1)); 0399 $thisfile_png_chunk_type_text[$gIFgCounter]['user_input_flag'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 1, 1)); 0400 $thisfile_png_chunk_type_text[$gIFgCounter]['delay_time'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2, 2)); 0401 break; 0402 0403 0404 case 'gIFx': // GIF Application Extension 0405 $gIFxCounter = 0; 0406 if (isset($thisfile_png_chunk_type_text) && is_array($thisfile_png_chunk_type_text)) { 0407 $gIFxCounter = count($thisfile_png_chunk_type_text); 0408 } 0409 $thisfile_png_chunk_type_text[$gIFxCounter]['header'] = $chunk; 0410 $thisfile_png_chunk_type_text[$gIFxCounter]['application_identifier'] = substr($chunk['data'], 0, 8); 0411 $thisfile_png_chunk_type_text[$gIFxCounter]['authentication_code'] = substr($chunk['data'], 8, 3); 0412 $thisfile_png_chunk_type_text[$gIFxCounter]['application_data'] = substr($chunk['data'], 11); 0413 break; 0414 0415 0416 case 'IDAT': // Image Data 0417 $idatinformationfieldindex = 0; 0418 if (isset($thisfile_png['IDAT']) && is_array($thisfile_png['IDAT'])) { 0419 $idatinformationfieldindex = count($thisfile_png['IDAT']); 0420 } 0421 unset($chunk['data']); 0422 $thisfile_png_chunk_type_text[$idatinformationfieldindex]['header'] = $chunk; 0423 break; 0424 0425 0426 case 'IEND': // Image Trailer 0427 $thisfile_png_chunk_type_text['header'] = $chunk; 0428 break; 0429 0430 0431 default: 0432 //unset($chunk['data']); 0433 $thisfile_png_chunk_type_text['header'] = $chunk; 0434 $info['warning'][] = 'Unhandled chunk type: '.$chunk['type_text']; 0435 break; 0436 } 0437 } 0438 0439 return true; 0440 } 0441 0442 public function PNGsRGBintentLookup($sRGB) { 0443 static $PNGsRGBintentLookup = array( 0444 0 => 'Perceptual', 0445 1 => 'Relative colorimetric', 0446 2 => 'Saturation', 0447 3 => 'Absolute colorimetric' 0448 ); 0449 return (isset($PNGsRGBintentLookup[$sRGB]) ? $PNGsRGBintentLookup[$sRGB] : 'invalid'); 0450 } 0451 0452 public function PNGcompressionMethodLookup($compressionmethod) { 0453 static $PNGcompressionMethodLookup = array( 0454 0 => 'deflate/inflate' 0455 ); 0456 return (isset($PNGcompressionMethodLookup[$compressionmethod]) ? $PNGcompressionMethodLookup[$compressionmethod] : 'invalid'); 0457 } 0458 0459 public function PNGpHYsUnitLookup($unitid) { 0460 static $PNGpHYsUnitLookup = array( 0461 0 => 'unknown', 0462 1 => 'meter' 0463 ); 0464 return (isset($PNGpHYsUnitLookup[$unitid]) ? $PNGpHYsUnitLookup[$unitid] : 'invalid'); 0465 } 0466 0467 public function PNGoFFsUnitLookup($unitid) { 0468 static $PNGoFFsUnitLookup = array( 0469 0 => 'pixel', 0470 1 => 'micrometer' 0471 ); 0472 return (isset($PNGoFFsUnitLookup[$unitid]) ? $PNGoFFsUnitLookup[$unitid] : 'invalid'); 0473 } 0474 0475 public function PNGpCALequationTypeLookup($equationtype) { 0476 static $PNGpCALequationTypeLookup = array( 0477 0 => 'Linear mapping', 0478 1 => 'Base-e exponential mapping', 0479 2 => 'Arbitrary-base exponential mapping', 0480 3 => 'Hyperbolic mapping' 0481 ); 0482 return (isset($PNGpCALequationTypeLookup[$equationtype]) ? $PNGpCALequationTypeLookup[$equationtype] : 'invalid'); 0483 } 0484 0485 public function PNGsCALUnitLookup($unitid) { 0486 static $PNGsCALUnitLookup = array( 0487 0 => 'meter', 0488 1 => 'radian' 0489 ); 0490 return (isset($PNGsCALUnitLookup[$unitid]) ? $PNGsCALUnitLookup[$unitid] : 'invalid'); 0491 } 0492 0493 public function IHDRcalculateBitsPerSample($color_type, $bit_depth) { 0494 switch ($color_type) { 0495 case 0: // Each pixel is a grayscale sample. 0496 return $bit_depth; 0497 break; 0498 0499 case 2: // Each pixel is an R,G,B triple 0500 return 3 * $bit_depth; 0501 break; 0502 0503 case 3: // Each pixel is a palette index; a PLTE chunk must appear. 0504 return $bit_depth; 0505 break; 0506 0507 case 4: // Each pixel is a grayscale sample, followed by an alpha sample. 0508 return 2 * $bit_depth; 0509 break; 0510 0511 case 6: // Each pixel is an R,G,B triple, followed by an alpha sample. 0512 return 4 * $bit_depth; 0513 break; 0514 } 0515 return false; 0516 } 0517 0518 }