getid3_quicktime::Analyze(): bool

52	public function Analyze() {53		$info = &$this->getid3->info;54 55		$this->metaDATAkey = 1;56		$info['fileformat'] = 'quicktime';57		$info['quicktime']['hinting']    = false;58		$info['quicktime']['controller'] = 'standard'; // may be overridden if 'ctyp' atom is present59 60		$this->fseek($info['avdataoffset']);61 62		$offset      = 0;63		$atomcounter = 0;64		$atom_data_read_buffer_size = $info['php_memory_limit'] ? round($info['php_memory_limit'] / 4) : $this->getid3->option_fread_buffer_size * 1024; // set read buffer to 25% of PHP memory limit (if one is specified), otherwise use option_fread_buffer_size [default: 32MB]65		while ($offset < $info['avdataend']) {66			if (!getid3_lib::intValueSupported($offset)) {67				$this->error('Unable to parse atom at offset '.$offset.' because beyond '.round(PHP_INT_MAX / 1073741824).'GB limit of PHP filesystem functions');68				break;69			}70			$this->fseek($offset);71			$AtomHeader = $this->fread(8);72 73			// https://github.com/JamesHeinrich/getID3/issues/38274			// Atom sizes are stored as 32-bit number in most cases, but sometimes (notably for "mdat")75			// a 64-bit value is required, in which case the normal 32-bit size field is set to 0x0000000176			// and the 64-bit "real" size value is the next 8 bytes.77			$atom_size_extended_bytes = 0;78			$atomsize = getid3_lib::BigEndian2Int(substr($AtomHeader, 0, 4));79			$atomname = substr($AtomHeader, 4, 4);80			if ($atomsize == 1) {81				$atom_size_extended_bytes = 8;82				$atomsize = getid3_lib::BigEndian2Int($this->fread($atom_size_extended_bytes));83			}84 85			if (($offset + $atomsize) > $info['avdataend']) {86				$info['quicktime'][$atomname]['name']   = $atomname;87				$info['quicktime'][$atomname]['size']   = $atomsize;88				$info['quicktime'][$atomname]['offset'] = $offset;89				$this->error('Atom at offset '.$offset.' claims to go beyond end-of-file (length: '.$atomsize.' bytes)');90				return false;91			}92			if ($atomsize == 0) {93				// Furthermore, for historical reasons the list of atoms is optionally94				// terminated by a 32-bit integer set to 0. If you are writing a program95				// to read user data atoms, you should allow for the terminating 0.96				$info['quicktime'][$atomname]['name']   = $atomname;97				$info['quicktime'][$atomname]['size']   = $atomsize;98				$info['quicktime'][$atomname]['offset'] = $offset;99				break;100			}101			$atomHierarchy = array();102			$parsedAtomData = $this->QuicktimeParseAtom($atomname, $atomsize, $this->fread(min($atomsize - $atom_size_extended_bytes, $atom_data_read_buffer_size)), $offset, $atomHierarchy, $this->ParseAllPossibleAtoms);103			$parsedAtomData['name']   = $atomname;104			$parsedAtomData['size']   = $atomsize;105			$parsedAtomData['offset'] = $offset;106			if ($atom_size_extended_bytes) {107				$parsedAtomData['xsize_bytes'] = $atom_size_extended_bytes;108			}109			if (in_array($atomname, array('uuid'))) {110				@$info['quicktime'][$atomname][] = $parsedAtomData;111			} else {112				$info['quicktime'][$atomname] = $parsedAtomData;113			}114 115			$offset += $atomsize;116			$atomcounter++;117		}118 119		if (!empty($info['avdataend_tmp'])) {120			// this value is assigned to a temp value and then erased because121			// otherwise any atoms beyond the 'mdat' atom would not get parsed122			$info['avdataend'] = $info['avdataend_tmp'];123			unset($info['avdataend_tmp']);124		}125 126		if (isset($info['quicktime']['comments']['chapters']) && is_array($info['quicktime']['comments']['chapters']) && (count($info['quicktime']['comments']['chapters']) > 0)) {127			$durations = $this->quicktime_time_to_sample_table($info);128			for ($i = 0; $i < count($info['quicktime']['comments']['chapters']); $i++) {129				$bookmark = array();130				$bookmark['title'] = $info['quicktime']['comments']['chapters'][$i];131				if (isset($durations[$i])) {