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Editing: module.graphic.png.php
<?php ///////////////////////////////////////////////////////////////// /// getID3() by James Heinrich <info@getid3.org> // // available at https://github.com/JamesHeinrich/getID3 // // or https://www.getid3.org // // or http://getid3.sourceforge.net // // see readme.txt for more details // ///////////////////////////////////////////////////////////////// // // // module.graphic.png.php // // module for analyzing PNG Image files // // dependencies: NONE // // /// ///////////////////////////////////////////////////////////////// if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers exit; } class getid3_png extends getid3_handler { /** * If data chunk is larger than this do not read it completely (getID3 only needs the first * few dozen bytes for parsing). * * @var int */ public $max_data_bytes = 10000000; /** * @return bool */ public function Analyze() { $info = &$this->getid3->info; // shortcut $info['png'] = array(); $thisfile_png = &$info['png']; $info['fileformat'] = 'png'; $info['video']['dataformat'] = 'png'; $info['video']['lossless'] = false; $this->fseek($info['avdataoffset']); $PNGfiledata = $this->fread($this->getid3->fread_buffer_size()); $offset = 0; $PNGidentifier = substr($PNGfiledata, $offset, 8); // $89 $50 $4E $47 $0D $0A $1A $0A $offset += 8; if ($PNGidentifier != "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A") { $this->error('First 8 bytes of file ('.getid3_lib::PrintHexBytes($PNGidentifier).') did not match expected PNG identifier'); unset($info['fileformat']); return false; } while ((($this->ftell() - (strlen($PNGfiledata) - $offset)) < $info['filesize'])) { $chunk = array(); $chunk['data_length'] = getid3_lib::BigEndian2Int(substr($PNGfiledata, $offset, 4)); if ($chunk['data_length'] === false) { $this->error('Failed to read data_length at offset '.$offset); return false; } $offset += 4; $truncated_data = false; while (((strlen($PNGfiledata) - $offset) < ($chunk['data_length'] + 4)) && ($this->ftell() < $info['filesize'])) { if (strlen($PNGfiledata) < $this->max_data_bytes) { $str = $this->fread($this->getid3->fread_buffer_size()); if (strlen($str) > 0) { $PNGfiledata .= $str; } else { $this->warning('At offset '.$offset.' chunk "'.substr($PNGfiledata, $offset, 4).'" no more data to read, data chunk will be truncated at '.(strlen($PNGfiledata) - 8).' bytes'); break; } } else { $this->warning('At offset '.$offset.' chunk "'.substr($PNGfiledata, $offset, 4).'" exceeded max_data_bytes value of '.$this->max_data_bytes.', data chunk will be truncated at '.(strlen($PNGfiledata) - 8).' bytes'); break; } } $chunk['type_text'] = substr($PNGfiledata, $offset, 4); $offset += 4; $chunk['type_raw'] = getid3_lib::BigEndian2Int($chunk['type_text']); $chunk['data'] = substr($PNGfiledata, $offset, $chunk['data_length']); $offset += $chunk['data_length']; $chunk['crc'] = getid3_lib::BigEndian2Int(substr($PNGfiledata, $offset, 4)); $offset += 4; $chunk['flags']['ancilliary'] = (bool) ($chunk['type_raw'] & 0x20000000); $chunk['flags']['private'] = (bool) ($chunk['type_raw'] & 0x00200000); $chunk['flags']['reserved'] = (bool) ($chunk['type_raw'] & 0x00002000); $chunk['flags']['safe_to_copy'] = (bool) ($chunk['type_raw'] & 0x00000020); // shortcut $thisfile_png[$chunk['type_text']] = array(); $thisfile_png_chunk_type_text = &$thisfile_png[$chunk['type_text']]; switch ($chunk['type_text']) { case 'IHDR': // Image Header $thisfile_png_chunk_type_text['header'] = $chunk; $thisfile_png_chunk_type_text['width'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4)); $thisfile_png_chunk_type_text['height'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4)); $thisfile_png_chunk_type_text['raw']['bit_depth'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 8, 1)); $thisfile_png_chunk_type_text['raw']['color_type'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 9, 1)); $thisfile_png_chunk_type_text['raw']['compression_method'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 10, 1)); $thisfile_png_chunk_type_text['raw']['filter_method'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 11, 1)); $thisfile_png_chunk_type_text['raw']['interlace_method'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 12, 1)); $thisfile_png_chunk_type_text['compression_method_text'] = $this->PNGcompressionMethodLookup($thisfile_png_chunk_type_text['raw']['compression_method']); $thisfile_png_chunk_type_text['color_type']['palette'] = (bool) ($thisfile_png_chunk_type_text['raw']['color_type'] & 0x01); $thisfile_png_chunk_type_text['color_type']['true_color'] = (bool) ($thisfile_png_chunk_type_text['raw']['color_type'] & 0x02); $thisfile_png_chunk_type_text['color_type']['alpha'] = (bool) ($thisfile_png_chunk_type_text['raw']['color_type'] & 0x04); $info['video']['resolution_x'] = $thisfile_png_chunk_type_text['width']; $info['video']['resolution_y'] = $thisfile_png_chunk_type_text['height']; $info['video']['bits_per_sample'] = $this->IHDRcalculateBitsPerSample($thisfile_png_chunk_type_text['raw']['color_type'], $thisfile_png_chunk_type_text['raw']['bit_depth']); break; case 'PLTE': // Palette $thisfile_png_chunk_type_text['header'] = $chunk; $paletteoffset = 0; for ($i = 0; $i <= 255; $i++) { //$thisfile_png_chunk_type_text['red'][$i] = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1)); //$thisfile_png_chunk_type_text['green'][$i] = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1)); //$thisfile_png_chunk_type_text['blue'][$i] = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1)); $red = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1)); $green = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1)); $blue = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1)); $thisfile_png_chunk_type_text[$i] = (($red << 16) | ($green << 8) | ($blue)); } break; case 'tRNS': // Transparency $thisfile_png_chunk_type_text['header'] = $chunk; switch ($thisfile_png['IHDR']['raw']['color_type']) { case 0: $thisfile_png_chunk_type_text['transparent_color_gray'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 2)); break; case 2: $thisfile_png_chunk_type_text['transparent_color_red'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 2)); $thisfile_png_chunk_type_text['transparent_color_green'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2, 2)); $thisfile_png_chunk_type_text['transparent_color_blue'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 2)); break; case 3: for ($i = 0; $i < strlen($chunk['data']); $i++) { $thisfile_png_chunk_type_text['palette_opacity'][$i] = getid3_lib::BigEndian2Int(substr($chunk['data'], $i, 1)); } break; case 4: case 6: $this->error('Invalid color_type in tRNS chunk: '.$thisfile_png['IHDR']['raw']['color_type']); break; default: $this->warning('Unhandled color_type in tRNS chunk: '.$thisfile_png['IHDR']['raw']['color_type']); break; } break; case 'gAMA': // Image Gamma $thisfile_png_chunk_type_text['header'] = $chunk; $thisfile_png_chunk_type_text['gamma'] = getid3_lib::BigEndian2Int($chunk['data']) / 100000; break; case 'cHRM': // Primary Chromaticities $thisfile_png_chunk_type_text['header'] = $chunk; $thisfile_png_chunk_type_text['white_x'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4)) / 100000; $thisfile_png_chunk_type_text['white_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4)) / 100000; $thisfile_png_chunk_type_text['red_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 8, 4)) / 100000; $thisfile_png_chunk_type_text['red_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 12, 4)) / 100000; $thisfile_png_chunk_type_text['green_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 16, 4)) / 100000; $thisfile_png_chunk_type_text['green_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 20, 4)) / 100000; $thisfile_png_chunk_type_text['blue_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 24, 4)) / 100000; $thisfile_png_chunk_type_text['blue_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 28, 4)) / 100000; break; case 'sRGB': // Standard RGB Color Space $thisfile_png_chunk_type_text['header'] = $chunk; $thisfile_png_chunk_type_text['reindering_intent'] = getid3_lib::BigEndian2Int($chunk['data']); $thisfile_png_chunk_type_text['reindering_intent_text'] = $this->PNGsRGBintentLookup($thisfile_png_chunk_type_text['reindering_intent']); break; case 'iCCP': // Embedded ICC Profile $thisfile_png_chunk_type_text['header'] = $chunk; list($profilename, $compressiondata) = explode("\x00", $chunk['data'], 2); $thisfile_png_chunk_type_text['profile_name'] = $profilename; $thisfile_png_chunk_type_text['compression_method'] = getid3_lib::BigEndian2Int(substr($compressiondata, 0, 1)); $thisfile_png_chunk_type_text['compression_profile'] = substr($compressiondata, 1); $thisfile_png_chunk_type_text['compression_method_text'] = $this->PNGcompressionMethodLookup($thisfile_png_chunk_type_text['compression_method']); break; case 'tEXt': // Textual Data $thisfile_png_chunk_type_text['header'] = $chunk; list($keyword, $text) = explode("\x00", $chunk['data'], 2); $thisfile_png_chunk_type_text['keyword'] = $keyword; $thisfile_png_chunk_type_text['text'] = $text; $thisfile_png['comments'][$thisfile_png_chunk_type_text['keyword']][] = $thisfile_png_chunk_type_text['text']; break; case 'zTXt': // Compressed Textual Data $thisfile_png_chunk_type_text['header'] = $chunk; list($keyword, $otherdata) = explode("\x00", $chunk['data'], 2); $thisfile_png_chunk_type_text['keyword'] = $keyword; $thisfile_png_chunk_type_text['compression_method'] = getid3_lib::BigEndian2Int(substr($otherdata, 0, 1)); $thisfile_png_chunk_type_text['compressed_text'] = substr($otherdata, 1); $thisfile_png_chunk_type_text['compression_method_text'] = $this->PNGcompressionMethodLookup($thisfile_png_chunk_type_text['compression_method']); switch ($thisfile_png_chunk_type_text['compression_method']) { case 0: $thisfile_png_chunk_type_text['text'] = gzuncompress($thisfile_png_chunk_type_text['compressed_text']); break; default: // unknown compression method break; } if (isset($thisfile_png_chunk_type_text['text'])) { $thisfile_png['comments'][$thisfile_png_chunk_type_text['keyword']][] = $thisfile_png_chunk_type_text['text']; } break; case 'iTXt': // International Textual Data $thisfile_png_chunk_type_text['header'] = $chunk; list($keyword, $otherdata) = explode("\x00", $chunk['data'], 2); $thisfile_png_chunk_type_text['keyword'] = $keyword; $thisfile_png_chunk_type_text['compression'] = (bool) getid3_lib::BigEndian2Int(substr($otherdata, 0, 1)); $thisfile_png_chunk_type_text['compression_method'] = getid3_lib::BigEndian2Int(substr($otherdata, 1, 1)); $thisfile_png_chunk_type_text['compression_method_text'] = $this->PNGcompressionMethodLookup($thisfile_png_chunk_type_text['compression_method']); list($languagetag, $translatedkeyword, $text) = explode("\x00", substr($otherdata, 2), 3); $thisfile_png_chunk_type_text['language_tag'] = $languagetag; $thisfile_png_chunk_type_text['translated_keyword'] = $translatedkeyword; if ($thisfile_png_chunk_type_text['compression']) { switch ($thisfile_png_chunk_type_text['compression_method']) { case 0: $thisfile_png_chunk_type_text['text'] = gzuncompress($text); break; default: // unknown compression method break; } } else { $thisfile_png_chunk_type_text['text'] = $text; } if (isset($thisfile_png_chunk_type_text['text'])) { $thisfile_png['comments'][$thisfile_png_chunk_type_text['keyword']][] = $thisfile_png_chunk_type_text['text']; } break; case 'bKGD': // Background Color $thisfile_png_chunk_type_text['header'] = $chunk; switch ($thisfile_png['IHDR']['raw']['color_type']) { case 0: case 4: $thisfile_png_chunk_type_text['background_gray'] = getid3_lib::BigEndian2Int($chunk['data']); break; case 2: case 6: $thisfile_png_chunk_type_text['background_red'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0 * $thisfile_png['IHDR']['raw']['bit_depth'], $thisfile_png['IHDR']['raw']['bit_depth'])); $thisfile_png_chunk_type_text['background_green'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 1 * $thisfile_png['IHDR']['raw']['bit_depth'], $thisfile_png['IHDR']['raw']['bit_depth'])); $thisfile_png_chunk_type_text['background_blue'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2 * $thisfile_png['IHDR']['raw']['bit_depth'], $thisfile_png['IHDR']['raw']['bit_depth'])); break; case 3: $thisfile_png_chunk_type_text['background_index'] = getid3_lib::BigEndian2Int($chunk['data']); break; default: break; } break; case 'pHYs': // Physical Pixel Dimensions $thisfile_png_chunk_type_text['header'] = $chunk; $thisfile_png_chunk_type_text['pixels_per_unit_x'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4)); $thisfile_png_chunk_type_text['pixels_per_unit_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4)); $thisfile_png_chunk_type_text['unit_specifier'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 8, 1)); $thisfile_png_chunk_type_text['unit'] = $this->PNGpHYsUnitLookup($thisfile_png_chunk_type_text['unit_specifier']); break; case 'sBIT': // Significant Bits $thisfile_png_chunk_type_text['header'] = $chunk; switch ($thisfile_png['IHDR']['raw']['color_type']) { case 0: $thisfile_png_chunk_type_text['significant_bits_gray'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1)); break; case 2: case 3: $thisfile_png_chunk_type_text['significant_bits_red'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1)); $thisfile_png_chunk_type_text['significant_bits_green'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 1, 1)); $thisfile_png_chunk_type_text['significant_bits_blue'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2, 1)); break; case 4: $thisfile_png_chunk_type_text['significant_bits_gray'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1)); $thisfile_png_chunk_type_text['significant_bits_alpha'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 1, 1)); break; case 6: $thisfile_png_chunk_type_text['significant_bits_red'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1)); $thisfile_png_chunk_type_text['significant_bits_green'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 1, 1)); $thisfile_png_chunk_type_text['significant_bits_blue'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2, 1)); $thisfile_png_chunk_type_text['significant_bits_alpha'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 3, 1)); break; default: break; } break; case 'sPLT': // Suggested Palette $thisfile_png_chunk_type_text['header'] = $chunk; list($palettename, $otherdata) = explode("\x00", $chunk['data'], 2); $thisfile_png_chunk_type_text['palette_name'] = $palettename; $sPLToffset = 0; $thisfile_png_chunk_type_text['sample_depth_bits'] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, 1)); $sPLToffset += 1; $thisfile_png_chunk_type_text['sample_depth_bytes'] = $thisfile_png_chunk_type_text['sample_depth_bits'] / 8; $paletteCounter = 0; while ($sPLToffset < strlen($otherdata)) { $thisfile_png_chunk_type_text['red'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, $thisfile_png_chunk_type_text['sample_depth_bytes'])); $sPLToffset += $thisfile_png_chunk_type_text['sample_depth_bytes']; $thisfile_png_chunk_type_text['green'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, $thisfile_png_chunk_type_text['sample_depth_bytes'])); $sPLToffset += $thisfile_png_chunk_type_text['sample_depth_bytes']; $thisfile_png_chunk_type_text['blue'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, $thisfile_png_chunk_type_text['sample_depth_bytes'])); $sPLToffset += $thisfile_png_chunk_type_text['sample_depth_bytes']; $thisfile_png_chunk_type_text['alpha'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, $thisfile_png_chunk_type_text['sample_depth_bytes'])); $sPLToffset += $thisfile_png_chunk_type_text['sample_depth_bytes']; $thisfile_png_chunk_type_text['frequency'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, 2)); $sPLToffset += 2; $paletteCounter++; } break; case 'hIST': // Palette Histogram $thisfile_png_chunk_type_text['header'] = $chunk; $hISTcounter = 0; while ($hISTcounter < strlen($chunk['data'])) { $thisfile_png_chunk_type_text[$hISTcounter] = getid3_lib::BigEndian2Int(substr($chunk['data'], $hISTcounter / 2, 2)); $hISTcounter += 2; } break; case 'tIME': // Image Last-Modification Time $thisfile_png_chunk_type_text['header'] = $chunk; $thisfile_png_chunk_type_text['year'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 2)); $thisfile_png_chunk_type_text['month'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2, 1)); $thisfile_png_chunk_type_text['day'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 3, 1)); $thisfile_png_chunk_type_text['hour'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 1)); $thisfile_png_chunk_type_text['minute'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 5, 1)); $thisfile_png_chunk_type_text['second'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 6, 1)); $thisfile_png_chunk_type_text['unix'] = gmmktime($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']); break; case 'oFFs': // Image Offset $thisfile_png_chunk_type_text['header'] = $chunk; $thisfile_png_chunk_type_text['position_x'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4), false, true); $thisfile_png_chunk_type_text['position_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4), false, true); $thisfile_png_chunk_type_text['unit_specifier'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 8, 1)); $thisfile_png_chunk_type_text['unit'] = $this->PNGoFFsUnitLookup($thisfile_png_chunk_type_text['unit_specifier']); break; case 'pCAL': // Calibration Of Pixel Values $thisfile_png_chunk_type_text['header'] = $chunk; list($calibrationname, $otherdata) = explode("\x00", $chunk['data'], 2); $thisfile_png_chunk_type_text['calibration_name'] = $calibrationname; $pCALoffset = 0; $thisfile_png_chunk_type_text['original_zero'] = getid3_lib::BigEndian2Int(substr($chunk['data'], $pCALoffset, 4), false, true); $pCALoffset += 4; $thisfile_png_chunk_type_text['original_max'] = getid3_lib::BigEndian2Int(substr($chunk['data'], $pCALoffset, 4), false, true); $pCALoffset += 4; $thisfile_png_chunk_type_text['equation_type'] = getid3_lib::BigEndian2Int(substr($chunk['data'], $pCALoffset, 1)); $pCALoffset += 1; $thisfile_png_chunk_type_text['equation_type_text'] = $this->PNGpCALequationTypeLookup($thisfile_png_chunk_type_text['equation_type']); $thisfile_png_chunk_type_text['parameter_count'] = getid3_lib::BigEndian2Int(substr($chunk['data'], $pCALoffset, 1)); $pCALoffset += 1; $thisfile_png_chunk_type_text['parameters'] = explode("\x00", substr($chunk['data'], $pCALoffset)); break; case 'sCAL': // Physical Scale Of Image Subject $thisfile_png_chunk_type_text['header'] = $chunk; $thisfile_png_chunk_type_text['unit_specifier'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1)); $thisfile_png_chunk_type_text['unit'] = $this->PNGsCALUnitLookup($thisfile_png_chunk_type_text['unit_specifier']); list($pixelwidth, $pixelheight) = explode("\x00", substr($chunk['data'], 1)); $thisfile_png_chunk_type_text['pixel_width'] = $pixelwidth; $thisfile_png_chunk_type_text['pixel_height'] = $pixelheight; break; case 'gIFg': // GIF Graphic Control Extension $gIFgCounter = 0; if (isset($thisfile_png_chunk_type_text) && is_array($thisfile_png_chunk_type_text)) { $gIFgCounter = count($thisfile_png_chunk_type_text); } $thisfile_png_chunk_type_text[$gIFgCounter]['header'] = $chunk; $thisfile_png_chunk_type_text[$gIFgCounter]['disposal_method'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1)); $thisfile_png_chunk_type_text[$gIFgCounter]['user_input_flag'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 1, 1)); $thisfile_png_chunk_type_text[$gIFgCounter]['delay_time'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2, 2)); break; case 'gIFx': // GIF Application Extension $gIFxCounter = 0; if (isset($thisfile_png_chunk_type_text) && is_array($thisfile_png_chunk_type_text)) { $gIFxCounter = count($thisfile_png_chunk_type_text); } $thisfile_png_chunk_type_text[$gIFxCounter]['header'] = $chunk; $thisfile_png_chunk_type_text[$gIFxCounter]['application_identifier'] = substr($chunk['data'], 0, 8); $thisfile_png_chunk_type_text[$gIFxCounter]['authentication_code'] = substr($chunk['data'], 8, 3); $thisfile_png_chunk_type_text[$gIFxCounter]['application_data'] = substr($chunk['data'], 11); break; case 'IDAT': // Image Data $idatinformationfieldindex = 0; if (isset($thisfile_png['IDAT']) && is_array($thisfile_png['IDAT'])) { $idatinformationfieldindex = count($thisfile_png['IDAT']); } unset($chunk['data']); $thisfile_png_chunk_type_text[$idatinformationfieldindex]['header'] = $chunk; break; case 'IEND': // Image Trailer $thisfile_png_chunk_type_text['header'] = $chunk; break; case 'acTL': // Animation Control chunk // https://wiki.mozilla.org/APNG_Specification#.60acTL.60:_The_Animation_Control_Chunk $thisfile_png['animation']['num_frames'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4)); // Number of frames $thisfile_png['animation']['num_plays'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4)); // Number of times to loop this APNG. 0 indicates infinite looping. unset($chunk['data']); $thisfile_png_chunk_type_text['header'] = $chunk; break; case 'fcTL': // Frame Control chunk // https://wiki.mozilla.org/APNG_Specification#.60fcTL.60:_The_Frame_Control_Chunk $fcTL = array(); $fcTL['sequence_number'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4)); // Sequence number of the animation chunk, starting from 0 $fcTL['width'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4)); // Width of the following frame $fcTL['height'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 8, 4)); // Height of the following frame $fcTL['x_offset'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 12, 4)); // X position at which to render the following frame $fcTL['y_offset'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 16, 4)); // Y position at which to render the following frame $fcTL['delay_num'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 20, 2)); // Frame delay fraction numerator $fcTL['delay_den'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 22, 2)); // Frame delay fraction numerator $fcTL['dispose_op'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 23, 1)); // Type of frame area disposal to be done after rendering this frame $fcTL['blend_op'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 23, 1)); // Type of frame area rendering for this frame if ($fcTL['delay_den']) { $fcTL['delay'] = $fcTL['delay_num'] / $fcTL['delay_den']; } $thisfile_png['animation']['fcTL'][$fcTL['sequence_number']] = $fcTL; unset($chunk['data']); $thisfile_png_chunk_type_text['header'] = $chunk; break; case 'fdAT': // Frame Data chunk // https://wiki.mozilla.org/APNG_Specification#.60fcTL.60:_The_Frame_Control_Chunk // "The `fdAT` chunk has the same purpose as an `IDAT` chunk. It has the same structure as an `IDAT` chunk, except preceded by a sequence number." unset($chunk['data']); $thisfile_png_chunk_type_text['header'] = $chunk; break; default: //unset($chunk['data']); $thisfile_png_chunk_type_text['header'] = $chunk; $this->warning('Unhandled chunk type: '.$chunk['type_text']); break; } } if (!empty($thisfile_png['animation']['num_frames']) && !empty($thisfile_png['animation']['fcTL'])) { $info['video']['dataformat'] = 'apng'; $info['playtime_seconds'] = 0; foreach ($thisfile_png['animation']['fcTL'] as $seqno => $fcTL) { $info['playtime_seconds'] += $fcTL['delay']; } } return true; } /** * @param int $sRGB * * @return string */ public function PNGsRGBintentLookup($sRGB) { static $PNGsRGBintentLookup = array( 0 => 'Perceptual', 1 => 'Relative colorimetric', 2 => 'Saturation', 3 => 'Absolute colorimetric' ); return (isset($PNGsRGBintentLookup[$sRGB]) ? $PNGsRGBintentLookup[$sRGB] : 'invalid'); } /** * @param int $compressionmethod * * @return string */ public function PNGcompressionMethodLookup($compressionmethod) { static $PNGcompressionMethodLookup = array( 0 => 'deflate/inflate' ); return (isset($PNGcompressionMethodLookup[$compressionmethod]) ? $PNGcompressionMethodLookup[$compressionmethod] : 'invalid'); } /** * @param int $unitid * * @return string */ public function PNGpHYsUnitLookup($unitid) { static $PNGpHYsUnitLookup = array( 0 => 'unknown', 1 => 'meter' ); return (isset($PNGpHYsUnitLookup[$unitid]) ? $PNGpHYsUnitLookup[$unitid] : 'invalid'); } /** * @param int $unitid * * @return string */ public function PNGoFFsUnitLookup($unitid) { static $PNGoFFsUnitLookup = array( 0 => 'pixel', 1 => 'micrometer' ); return (isset($PNGoFFsUnitLookup[$unitid]) ? $PNGoFFsUnitLookup[$unitid] : 'invalid'); } /** * @param int $equationtype * * @return string */ public function PNGpCALequationTypeLookup($equationtype) { static $PNGpCALequationTypeLookup = array( 0 => 'Linear mapping', 1 => 'Base-e exponential mapping', 2 => 'Arbitrary-base exponential mapping', 3 => 'Hyperbolic mapping' ); return (isset($PNGpCALequationTypeLookup[$equationtype]) ? $PNGpCALequationTypeLookup[$equationtype] : 'invalid'); } /** * @param int $unitid * * @return string */ public function PNGsCALUnitLookup($unitid) { static $PNGsCALUnitLookup = array( 0 => 'meter', 1 => 'radian' ); return (isset($PNGsCALUnitLookup[$unitid]) ? $PNGsCALUnitLookup[$unitid] : 'invalid'); } /** * @param int $color_type * @param int $bit_depth * * @return int|false */ public function IHDRcalculateBitsPerSample($color_type, $bit_depth) { switch ($color_type) { case 0: // Each pixel is a grayscale sample. return $bit_depth; case 2: // Each pixel is an R,G,B triple return 3 * $bit_depth; case 3: // Each pixel is a palette index; a PLTE chunk must appear. return $bit_depth; case 4: // Each pixel is a grayscale sample, followed by an alpha sample. return 2 * $bit_depth; case 6: // Each pixel is an R,G,B triple, followed by an alpha sample. return 4 * $bit_depth; } return false; } }
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