def get_string(self, offset, length):
        """Returns string (length bytes)

        Args:
            offset (int): sring offset in byte array
            length (int): string length
        """
        return struct.unpack(str(length) + "s", self.data[
                                                offset:offset + length
                                                ])[0]
Returns string (length bytes)

        Args:
            offset (int): sring offset in byte array
            length (int): string length