2011-07-22 08:30:52 +04:00
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<?php
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/////////////////////////////////////////////////////////////////
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/// getID3() by James Heinrich <info@getid3.org> //
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// available at http://getid3.sourceforge.net //
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// or http://www.getid3.org //
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/////////////////////////////////////////////////////////////////
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// See readme.txt for more details //
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/////////////////////////////////////////////////////////////////
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// //
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// module.graphic.png.php //
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// module for analyzing PNG Image files //
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// dependencies: NONE //
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// ///
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/////////////////////////////////////////////////////////////////
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2012-04-03 01:33:18 +04:00
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class getid3_png extends getid3_handler
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2011-07-22 08:30:52 +04:00
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{
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2012-04-03 01:33:18 +04:00
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function Analyze() {
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$info = &$this->getid3->info;
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2011-07-22 08:30:52 +04:00
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2012-04-03 01:33:18 +04:00
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// shortcut
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$info['png'] = array();
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$thisfile_png = &$info['png'];
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2011-07-22 08:30:52 +04:00
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2012-04-03 01:33:18 +04:00
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$info['fileformat'] = 'png';
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$info['video']['dataformat'] = 'png';
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$info['video']['lossless'] = false;
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2011-07-22 08:30:52 +04:00
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2012-04-03 01:33:18 +04:00
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fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);
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$PNGfiledata = fread($this->getid3->fp, $this->getid3->fread_buffer_size());
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2011-07-22 08:30:52 +04:00
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$offset = 0;
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$PNGidentifier = substr($PNGfiledata, $offset, 8); // $89 $50 $4E $47 $0D $0A $1A $0A
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$offset += 8;
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if ($PNGidentifier != "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A") {
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2012-04-03 01:33:18 +04:00
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$info['error'][] = 'First 8 bytes of file ('.getid3_lib::PrintHexBytes($PNGidentifier).') did not match expected PNG identifier';
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unset($info['fileformat']);
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2011-07-22 08:30:52 +04:00
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return false;
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}
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2012-04-03 01:33:18 +04:00
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while (((ftell($this->getid3->fp) - (strlen($PNGfiledata) - $offset)) < $info['filesize'])) {
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2011-07-22 08:30:52 +04:00
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$chunk['data_length'] = getid3_lib::BigEndian2Int(substr($PNGfiledata, $offset, 4));
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$offset += 4;
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2012-04-03 01:33:18 +04:00
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while (((strlen($PNGfiledata) - $offset) < ($chunk['data_length'] + 4)) && (ftell($this->getid3->fp) < $info['filesize'])) {
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$PNGfiledata .= fread($this->getid3->fp, $this->getid3->fread_buffer_size());
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2011-07-22 08:30:52 +04:00
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}
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$chunk['type_text'] = substr($PNGfiledata, $offset, 4);
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$offset += 4;
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$chunk['type_raw'] = getid3_lib::BigEndian2Int($chunk['type_text']);
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$chunk['data'] = substr($PNGfiledata, $offset, $chunk['data_length']);
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$offset += $chunk['data_length'];
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$chunk['crc'] = getid3_lib::BigEndian2Int(substr($PNGfiledata, $offset, 4));
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$offset += 4;
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$chunk['flags']['ancilliary'] = (bool) ($chunk['type_raw'] & 0x20000000);
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$chunk['flags']['private'] = (bool) ($chunk['type_raw'] & 0x00200000);
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$chunk['flags']['reserved'] = (bool) ($chunk['type_raw'] & 0x00002000);
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$chunk['flags']['safe_to_copy'] = (bool) ($chunk['type_raw'] & 0x00000020);
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// shortcut
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$thisfile_png[$chunk['type_text']] = array();
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$thisfile_png_chunk_type_text = &$thisfile_png[$chunk['type_text']];
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switch ($chunk['type_text']) {
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case 'IHDR': // Image Header
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$thisfile_png_chunk_type_text['header'] = $chunk;
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$thisfile_png_chunk_type_text['width'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4));
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$thisfile_png_chunk_type_text['height'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4));
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$thisfile_png_chunk_type_text['raw']['bit_depth'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 8, 1));
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$thisfile_png_chunk_type_text['raw']['color_type'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 9, 1));
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$thisfile_png_chunk_type_text['raw']['compression_method'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 10, 1));
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$thisfile_png_chunk_type_text['raw']['filter_method'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 11, 1));
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$thisfile_png_chunk_type_text['raw']['interlace_method'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 12, 1));
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$thisfile_png_chunk_type_text['compression_method_text'] = $this->PNGcompressionMethodLookup($thisfile_png_chunk_type_text['raw']['compression_method']);
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$thisfile_png_chunk_type_text['color_type']['palette'] = (bool) ($thisfile_png_chunk_type_text['raw']['color_type'] & 0x01);
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$thisfile_png_chunk_type_text['color_type']['true_color'] = (bool) ($thisfile_png_chunk_type_text['raw']['color_type'] & 0x02);
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$thisfile_png_chunk_type_text['color_type']['alpha'] = (bool) ($thisfile_png_chunk_type_text['raw']['color_type'] & 0x04);
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2012-04-03 01:33:18 +04:00
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$info['video']['resolution_x'] = $thisfile_png_chunk_type_text['width'];
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$info['video']['resolution_y'] = $thisfile_png_chunk_type_text['height'];
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2011-07-22 08:30:52 +04:00
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2012-04-03 01:33:18 +04:00
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$info['video']['bits_per_sample'] = $this->IHDRcalculateBitsPerSample($thisfile_png_chunk_type_text['raw']['color_type'], $thisfile_png_chunk_type_text['raw']['bit_depth']);
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2011-07-22 08:30:52 +04:00
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break;
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case 'PLTE': // Palette
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$thisfile_png_chunk_type_text['header'] = $chunk;
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$paletteoffset = 0;
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for ($i = 0; $i <= 255; $i++) {
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//$thisfile_png_chunk_type_text['red'][$i] = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1));
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//$thisfile_png_chunk_type_text['green'][$i] = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1));
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//$thisfile_png_chunk_type_text['blue'][$i] = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1));
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$red = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1));
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$green = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1));
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$blue = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1));
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$thisfile_png_chunk_type_text[$i] = (($red << 16) | ($green << 8) | ($blue));
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}
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break;
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case 'tRNS': // Transparency
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$thisfile_png_chunk_type_text['header'] = $chunk;
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switch ($thisfile_png['IHDR']['raw']['color_type']) {
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case 0:
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$thisfile_png_chunk_type_text['transparent_color_gray'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 2));
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break;
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case 2:
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$thisfile_png_chunk_type_text['transparent_color_red'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 2));
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$thisfile_png_chunk_type_text['transparent_color_green'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2, 2));
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$thisfile_png_chunk_type_text['transparent_color_blue'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 2));
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break;
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case 3:
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for ($i = 0; $i < strlen($chunk['data']); $i++) {
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$thisfile_png_chunk_type_text['palette_opacity'][$i] = getid3_lib::BigEndian2Int(substr($chunk['data'], $i, 1));
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}
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break;
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case 4:
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case 6:
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2012-04-03 01:33:18 +04:00
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$info['error'][] = 'Invalid color_type in tRNS chunk: '.$thisfile_png['IHDR']['raw']['color_type'];
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2011-07-22 08:30:52 +04:00
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default:
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2012-04-03 01:33:18 +04:00
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$info['warning'][] = 'Unhandled color_type in tRNS chunk: '.$thisfile_png['IHDR']['raw']['color_type'];
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2011-07-22 08:30:52 +04:00
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break;
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}
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break;
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case 'gAMA': // Image Gamma
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$thisfile_png_chunk_type_text['header'] = $chunk;
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$thisfile_png_chunk_type_text['gamma'] = getid3_lib::BigEndian2Int($chunk['data']) / 100000;
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break;
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case 'cHRM': // Primary Chromaticities
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$thisfile_png_chunk_type_text['header'] = $chunk;
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$thisfile_png_chunk_type_text['white_x'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4)) / 100000;
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$thisfile_png_chunk_type_text['white_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4)) / 100000;
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$thisfile_png_chunk_type_text['red_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 8, 4)) / 100000;
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$thisfile_png_chunk_type_text['red_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 12, 4)) / 100000;
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$thisfile_png_chunk_type_text['green_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 16, 4)) / 100000;
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$thisfile_png_chunk_type_text['green_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 20, 4)) / 100000;
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$thisfile_png_chunk_type_text['blue_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 24, 4)) / 100000;
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$thisfile_png_chunk_type_text['blue_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 28, 4)) / 100000;
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break;
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case 'sRGB': // Standard RGB Color Space
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$thisfile_png_chunk_type_text['header'] = $chunk;
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$thisfile_png_chunk_type_text['reindering_intent'] = getid3_lib::BigEndian2Int($chunk['data']);
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$thisfile_png_chunk_type_text['reindering_intent_text'] = $this->PNGsRGBintentLookup($thisfile_png_chunk_type_text['reindering_intent']);
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break;
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case 'iCCP': // Embedded ICC Profile
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$thisfile_png_chunk_type_text['header'] = $chunk;
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list($profilename, $compressiondata) = explode("\x00", $chunk['data'], 2);
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$thisfile_png_chunk_type_text['profile_name'] = $profilename;
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$thisfile_png_chunk_type_text['compression_method'] = getid3_lib::BigEndian2Int(substr($compressiondata, 0, 1));
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$thisfile_png_chunk_type_text['compression_profile'] = substr($compressiondata, 1);
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$thisfile_png_chunk_type_text['compression_method_text'] = $this->PNGcompressionMethodLookup($thisfile_png_chunk_type_text['compression_method']);
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break;
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case 'tEXt': // Textual Data
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$thisfile_png_chunk_type_text['header'] = $chunk;
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list($keyword, $text) = explode("\x00", $chunk['data'], 2);
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$thisfile_png_chunk_type_text['keyword'] = $keyword;
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$thisfile_png_chunk_type_text['text'] = $text;
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$thisfile_png['comments'][$thisfile_png_chunk_type_text['keyword']][] = $thisfile_png_chunk_type_text['text'];
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break;
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case 'zTXt': // Compressed Textual Data
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$thisfile_png_chunk_type_text['header'] = $chunk;
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list($keyword, $otherdata) = explode("\x00", $chunk['data'], 2);
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$thisfile_png_chunk_type_text['keyword'] = $keyword;
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$thisfile_png_chunk_type_text['compression_method'] = getid3_lib::BigEndian2Int(substr($otherdata, 0, 1));
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$thisfile_png_chunk_type_text['compressed_text'] = substr($otherdata, 1);
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$thisfile_png_chunk_type_text['compression_method_text'] = $this->PNGcompressionMethodLookup($thisfile_png_chunk_type_text['compression_method']);
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switch ($thisfile_png_chunk_type_text['compression_method']) {
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case 0:
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$thisfile_png_chunk_type_text['text'] = gzuncompress($thisfile_png_chunk_type_text['compressed_text']);
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break;
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default:
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// unknown compression method
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break;
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}
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if (isset($thisfile_png_chunk_type_text['text'])) {
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$thisfile_png['comments'][$thisfile_png_chunk_type_text['keyword']][] = $thisfile_png_chunk_type_text['text'];
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}
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break;
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case 'iTXt': // International Textual Data
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$thisfile_png_chunk_type_text['header'] = $chunk;
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list($keyword, $otherdata) = explode("\x00", $chunk['data'], 2);
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$thisfile_png_chunk_type_text['keyword'] = $keyword;
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$thisfile_png_chunk_type_text['compression'] = (bool) getid3_lib::BigEndian2Int(substr($otherdata, 0, 1));
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$thisfile_png_chunk_type_text['compression_method'] = getid3_lib::BigEndian2Int(substr($otherdata, 1, 1));
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$thisfile_png_chunk_type_text['compression_method_text'] = $this->PNGcompressionMethodLookup($thisfile_png_chunk_type_text['compression_method']);
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list($languagetag, $translatedkeyword, $text) = explode("\x00", substr($otherdata, 2), 3);
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$thisfile_png_chunk_type_text['language_tag'] = $languagetag;
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$thisfile_png_chunk_type_text['translated_keyword'] = $translatedkeyword;
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if ($thisfile_png_chunk_type_text['compression']) {
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switch ($thisfile_png_chunk_type_text['compression_method']) {
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case 0:
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$thisfile_png_chunk_type_text['text'] = gzuncompress($text);
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break;
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default:
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// unknown compression method
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break;
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}
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} else {
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$thisfile_png_chunk_type_text['text'] = $text;
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}
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if (isset($thisfile_png_chunk_type_text['text'])) {
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$thisfile_png['comments'][$thisfile_png_chunk_type_text['keyword']][] = $thisfile_png_chunk_type_text['text'];
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}
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break;
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case 'bKGD': // Background Color
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$thisfile_png_chunk_type_text['header'] = $chunk;
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switch ($thisfile_png['IHDR']['raw']['color_type']) {
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case 0:
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case 4:
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$thisfile_png_chunk_type_text['background_gray'] = getid3_lib::BigEndian2Int($chunk['data']);
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break;
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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'] = $chunk;
|
|
|
|
|
break;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
default:
|
|
|
|
|
//unset($chunk['data']);
|
|
|
|
|
$thisfile_png_chunk_type_text['header'] = $chunk;
|
2012-04-03 01:33:18 +04:00
|
|
|
$info['warning'][] = 'Unhandled chunk type: '.$chunk['type_text'];
|
2011-07-22 08:30:52 +04:00
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return true;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
function PNGsRGBintentLookup($sRGB) {
|
|
|
|
|
static $PNGsRGBintentLookup = array(
|
|
|
|
|
0 => 'Perceptual',
|
|
|
|
|
1 => 'Relative colorimetric',
|
|
|
|
|
2 => 'Saturation',
|
|
|
|
|
3 => 'Absolute colorimetric'
|
|
|
|
|
);
|
|
|
|
|
return (isset($PNGsRGBintentLookup[$sRGB]) ? $PNGsRGBintentLookup[$sRGB] : 'invalid');
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
function PNGcompressionMethodLookup($compressionmethod) {
|
|
|
|
|
static $PNGcompressionMethodLookup = array(
|
|
|
|
|
0 => 'deflate/inflate'
|
|
|
|
|
);
|
|
|
|
|
return (isset($PNGcompressionMethodLookup[$compressionmethod]) ? $PNGcompressionMethodLookup[$compressionmethod] : 'invalid');
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
function PNGpHYsUnitLookup($unitid) {
|
|
|
|
|
static $PNGpHYsUnitLookup = array(
|
|
|
|
|
0 => 'unknown',
|
|
|
|
|
1 => 'meter'
|
|
|
|
|
);
|
|
|
|
|
return (isset($PNGpHYsUnitLookup[$unitid]) ? $PNGpHYsUnitLookup[$unitid] : 'invalid');
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
function PNGoFFsUnitLookup($unitid) {
|
|
|
|
|
static $PNGoFFsUnitLookup = array(
|
|
|
|
|
0 => 'pixel',
|
|
|
|
|
1 => 'micrometer'
|
|
|
|
|
);
|
|
|
|
|
return (isset($PNGoFFsUnitLookup[$unitid]) ? $PNGoFFsUnitLookup[$unitid] : 'invalid');
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
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');
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
function PNGsCALUnitLookup($unitid) {
|
|
|
|
|
static $PNGsCALUnitLookup = array(
|
|
|
|
|
0 => 'meter',
|
|
|
|
|
1 => 'radian'
|
|
|
|
|
);
|
|
|
|
|
return (isset($PNGsCALUnitLookup[$unitid]) ? $PNGsCALUnitLookup[$unitid] : 'invalid');
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
function IHDRcalculateBitsPerSample($color_type, $bit_depth) {
|
|
|
|
|
switch ($color_type) {
|
|
|
|
|
case 0: // Each pixel is a grayscale sample.
|
|
|
|
|
return $bit_depth;
|
|
|
|
|
break;
|
|
|
|
|
|
|
|
|
|
case 2: // Each pixel is an R,G,B triple
|
|
|
|
|
return 3 * $bit_depth;
|
|
|
|
|
break;
|
|
|
|
|
|
|
|
|
|
case 3: // Each pixel is a palette index; a PLTE chunk must appear.
|
|
|
|
|
return $bit_depth;
|
|
|
|
|
break;
|
|
|
|
|
|
|
|
|
|
case 4: // Each pixel is a grayscale sample, followed by an alpha sample.
|
|
|
|
|
return 2 * $bit_depth;
|
|
|
|
|
break;
|
|
|
|
|
|
|
|
|
|
case 6: // Each pixel is an R,G,B triple, followed by an alpha sample.
|
|
|
|
|
return 4 * $bit_depth;
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
?>
|
