getID3::openfile

		return true;
	}

	/**
	 * @param string   $filename
	 * @param int      $filesize
	 * @param resource $fp
	 *
	 * @return bool
	 *
	 * @throws getid3_exception
	 */
	public function openfile($filename, $filesize=null, $fp=null) {
		try {
			if (!empty($this->startup_error)) {
				throw new getid3_exception($this->startup_error);
			}
			if (!empty($this->startup_warning)) {
				foreach (explode("\n", $this->startup_warning) as $startup_warning) {
					$this->warning($startup_warning);
				}
			}

			// init result array and set parameters
			$this->filename = $filename;
			$this->info = array();
			$this->info['GETID3_VERSION']   = $this->version();
			$this->info['php_memory_limit'] = (($this->memory_limit > 0) ? $this->memory_limit : false);

			// remote files not supported
			if (preg_match('#^(ht|f)tp://#', $filename)) {
				throw new getid3_exception('Remote files are not supported - please copy the file locally first');
			}

			$filename = str_replace('/', DIRECTORY_SEPARATOR, $filename);
			//$filename = preg_replace('#(?<!gs:)('.preg_quote(DIRECTORY_SEPARATOR).'{2,})#', DIRECTORY_SEPARATOR, $filename);

			// open local file
			//if (is_readable($filename) && is_file($filename) && ($this->fp = fopen($filename, 'rb'))) { // see https://www.getid3.org/phpBB3/viewtopic.php?t=1720
			if (($fp != null) && ((get_resource_type($fp) == 'file') || (get_resource_type($fp) == 'stream'))) {
				$this->fp = $fp;
			} elseif ((is_readable($filename) || file_exists($filename)) && is_file($filename) && ($this->fp = fopen($filename, 'rb'))) {
				// great
			} else {
				$errormessagelist = array();
				if (!is_readable($filename)) {
					$errormessagelist[] = '!is_readable';
				}
				if (!is_file($filename)) {
					$errormessagelist[] = '!is_file';
				}
				if (!file_exists($filename)) {
					$errormessagelist[] = '!file_exists';
				}
				if (empty($errormessagelist)) {
					$errormessagelist[] = 'fopen failed';
				}
				throw new getid3_exception('Could not open "'.$filename.'" ('.implode('; ', $errormessagelist).')');
			}

			$this->info['filesize'] = (!is_null($filesize) ? $filesize : filesize($filename));
			// set redundant parameters - might be needed in some include file
			// filenames / filepaths in getID3 are always expressed with forward slashes (unix-style) for both Windows and other to try and minimize confusion
			$filename = str_replace('\\', '/', $filename);
			$this->info['filepath']     = str_replace('\\', '/', realpath(dirname($filename)));
			$this->info['filename']     = getid3_lib::mb_basename($filename);
			$this->info['filenamepath'] = $this->info['filepath'].'/'.$this->info['filename'];

			// set more parameters
			$this->info['avdataoffset']        = 0;
			$this->info['avdataend']           = $this->info['filesize'];
			$this->info['fileformat']          = '';                // filled in later
			$this->info['audio']['dataformat'] = '';                // filled in later, unset if not used
			$this->info['video']['dataformat'] = '';                // filled in later, unset if not used
			$this->info['tags']                = array();           // filled in later, unset if not used
			$this->info['error']               = array();           // filled in later, unset if not used
			$this->info['warning']             = array();           // filled in later, unset if not used
			$this->info['comments']            = array();           // filled in later, unset if not used
			$this->info['encoding']            = $this->encoding;   // required by id3v2 and iso modules - can be unset at the end if desired

			// option_max_2gb_check
			if ($this->option_max_2gb_check) {
				// PHP (32-bit all, and 64-bit Windows) doesn't support integers larger than 2^31 (~2GB)
				// filesize() simply returns (filesize % (pow(2, 32)), no matter the actual filesize
				// ftell() returns 0 if seeking to the end is beyond the range of unsigned integer
				$fseek = fseek($this->fp, 0, SEEK_END);
				if (($fseek < 0) || (($this->info['filesize'] != 0) && (ftell($this->fp) == 0)) ||
					($this->info['filesize'] < 0) ||
					(ftell($this->fp) < 0)) {
						$real_filesize = getid3_lib::getFileSizeSyscall($this->info['filenamepath']);

						if ($real_filesize === false) {
							unset($this->info['filesize']);
							fclose($this->fp);
							throw new getid3_exception('Unable to determine actual filesize. File is most likely larger than '.round(PHP_INT_MAX / 1073741824).'GB and is not supported by PHP.');
						} elseif (getid3_lib::intValueSupported($real_filesize)) {
							unset($this->info['filesize']);
							fclose($this->fp);
							throw new getid3_exception('PHP seems to think the file is larger than '.round(PHP_INT_MAX / 1073741824).'GB, but filesystem reports it as '.number_format($real_filesize / 1073741824, 3).'GB, please report to info@getid3.org');
						}