getID3::openfile( string $filename, int $filesize = null, resource $fp = null ): bool

557	public function openfile($filename, $filesize=null, $fp=null) {558		try {559			if (!empty($this->startup_error)) {560				throw new getid3_exception($this->startup_error);561			}562			if (!empty($this->startup_warning)) {563				foreach (explode("\n", $this->startup_warning) as $startup_warning) {564					$this->warning($startup_warning);565				}566			}567 568			// init result array and set parameters569			$this->filename = $filename;570			$this->info = array();571			$this->info['GETID3_VERSION']   = $this->version();572			$this->info['php_memory_limit'] = (($this->memory_limit > 0) ? $this->memory_limit : false);573 574			// remote files not supported575			if (preg_match('#^(ht|f)tps?://#', $filename)) {576				throw new getid3_exception('Remote files are not supported - please copy the file locally first');577			}578 579			$filename = str_replace('/', DIRECTORY_SEPARATOR, $filename);580			//$filename = preg_replace('#(?<!gs:)('.preg_quote(DIRECTORY_SEPARATOR).'{2,})#', DIRECTORY_SEPARATOR, $filename);581 582			// open local file583			//if (is_readable($filename) && is_file($filename) && ($this->fp = fopen($filename, 'rb'))) { // see https://www.getid3.org/phpBB3/viewtopic.php?t=1720584			if (($fp != null) && ((get_resource_type($fp) == 'file') || (get_resource_type($fp) == 'stream'))) {585				$this->fp = $fp;586			} elseif ((is_readable($filename) || file_exists($filename)) && is_file($filename) && ($this->fp = fopen($filename, 'rb'))) {587				// great588			} else {589				$errormessagelist = array();590				if (!is_readable($filename)) {591					$errormessagelist[] = '!is_readable';592				}593				if (!is_file($filename)) {594					$errormessagelist[] = '!is_file';595				}596				if (!file_exists($filename)) {597					$errormessagelist[] = '!file_exists';598				}599				if (empty($errormessagelist)) {600					$errormessagelist[] = 'fopen failed';601				}602				throw new getid3_exception('Could not open "'.$filename.'" ('.implode('; ', $errormessagelist).')');603			}604 605			$this->info['filesize'] = (!is_null($filesize) ? $filesize : filesize($filename));606			// set redundant parameters - might be needed in some include file607			// filenames / filepaths in getID3 are always expressed with forward slashes (unix-style) for both Windows and other to try and minimize confusion608			$filename = str_replace('\\', '/', $filename);609			$this->info['filepath']     = str_replace('\\', '/', realpath(dirname($filename)));610			$this->info['filename']     = getid3_lib::mb_basename($filename);611			$this->info['filenamepath'] = $this->info['filepath'].'/'.$this->info['filename'];612 613			// set more parameters614			$this->info['avdataoffset']        = 0;615			$this->info['avdataend']           = $this->info['filesize'];616			$this->info['fileformat']          = '';                // filled in later617			$this->info['audio']['dataformat'] = '';                // filled in later, unset if not used618			$this->info['video']['dataformat'] = '';                // filled in later, unset if not used619			$this->info['tags']                = array();           // filled in later, unset if not used620			$this->info['error']               = array();           // filled in later, unset if not used621			$this->info['warning']             = array();           // filled in later, unset if not used622			$this->info['comments']            = array();           // filled in later, unset if not used623			$this->info['encoding']            = $this->encoding;   // required by id3v2 and iso modules - can be unset at the end if desired624 625			// option_max_2gb_check626			if ($this->option_max_2gb_check) {627				// PHP (32-bit all, and 64-bit Windows) doesn't support integers larger than 2^31 (~2GB)628				// filesize() simply returns (filesize % (pow(2, 32)), no matter the actual filesize629				// ftell() returns 0 if seeking to the end is beyond the range of unsigned integer630				$fseek = fseek($this->fp, 0, SEEK_END);631				if (($fseek < 0) || (($this->info['filesize'] != 0) && (ftell($this->fp) == 0)) ||632					($this->info['filesize'] < 0) ||633					(ftell($this->fp) < 0)) {634						$real_filesize = getid3_lib::getFileSizeSyscall($this->info['filenamepath']);635 636						if ($real_filesize === false) {