/**
* Constructs the Id3v1 class with given file. The file is not mandatory
* argument and may be omitted as a new tag can be written to a file also by
* giving the filename to the {@link #write} method of this class.
*
* @param string|resource|Zend_Io_Reader $filename The path to the file,
* file descriptor of an opened file, or a {@link Zend_Io_Reader} instance.
* @throws Zend_Media_Id3_Exception if given file descriptor is not valid
*/
public function __construct($filename = null)
{
if ($filename === null) {
return;
}
if ($filename instanceof Zend_Io_Reader) {
$this->_reader =& $filename;
} else {
$this->_filename = $filename;
require_once 'Zend/Io/FileReader.php';
try {
$this->_reader = new Zend_Io_FileReader($filename);
} catch (Zend_Io_Exception $e) {
$this->_reader = null;
require_once 'Zend/Media/Id3/Exception.php';
throw new Zend_Media_Id3_Exception($e->getMessage());
}
}
if ($this->_reader->getSize() < 128) {
$this->_reader = null;
require_once 'Zend/Media/Id3/Exception.php';
throw new Zend_Media_Id3_Exception('File does not contain ID3v1 tag');
}
$this->_reader->setOffset(-128);
if ($this->_reader->read(3) != 'TAG') {
$this->_reader = null;
require_once 'Zend/Media/Id3/Exception.php';
throw new Zend_Media_Id3_Exception('File does not contain ID3v1 tag');
}
$this->_title = $this->_reader->readString8(30, " ");
$this->_artist = $this->_reader->readString8(30, " ");
$this->_album = $this->_reader->readString8(30, " ");
$this->_year = $this->_reader->readString8(4);
$this->_comment = $this->_reader->readString8(28);
/* ID3v1.1 support for tracks */
$v11_null = $this->_reader->read(1);
$v11_track = $this->_reader->read(1);
if (ord($v11_null) == 0 && ord($v11_track) != 0) {
$this->_track = ord($v11_track);
} else {
$this->_comment = rtrim($this->_comment . $v11_null . $v11_track, " ");
}
$this->_genre = $this->_reader->readInt8();
}