getid3_quicktime

24class getid3_quicktime extends getid3_handler25{26 27	/** audio-video.quicktime28	 * return all parsed data from all atoms if true, otherwise just returned parsed metadata29	 *30	 * @var bool31	 */32	public $ReturnAtomData        = false;33 34	/** audio-video.quicktime35	 * return all parsed data from all atoms if true, otherwise just returned parsed metadata36	 *37	 * @var bool38	 */39	public $ParseAllPossibleAtoms = false;40 41	/**42	 * real ugly, but so is the QuickTime structure that stores keys and values in different multi-nested locations that are hard to relate to each other43	 * https://github.com/JamesHeinrich/getID3/issues/21444	 *45	 * @var int46	 */47	private $metaDATAkey = 1;48 49	/**50	 * @return bool51	 */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;