Read bytes with length `size` without incrementing the current offset

        :param int size: length to read in bytes
        :rtype: bytearray

def read_b(self, size):
        """
        Read bytes with length `size` without incrementing the current offset

        :param int size: length to read in bytes
        :rtype: bytearray
        """
        return self.__buff[self.__idx:self.__idx + size]