public function __construct(Torrent $torrent, $dir)
{
$this->torrent = $torrent;
$this->dir = $dir;
$this->pieceSize = $torrent->getPieceSize();
$this->pieceCount = $torrent->getPieceCount();
$this->maxPieces = self::calculateMaxPieces($this->pieceSize);
$this->openFiles = array();
$this->pieces = array();
$this->dirty = array();
$this->pieceSequences = array_fill(0, $this->pieceCount, 0);
}