public function readLine()
    {
        if (!is_resource($this->fp)) {
            return $this->raiseError('not connected');
        }

        $line = '';

        $timeout = time() + $this->timeout;

        while (!feof($this->fp) && (!$this->timeout || time() < $timeout)) {
            $line .= @fgets($this->fp, $this->lineLength);
            if (substr($line, -1) == "\n") {
                return rtrim($line, $this->newline);
            }
        }

        return $line;
    }