parse an integer from the buffer given the interval of bytes
        :param buff:
        :param start:
        :param end:

def parse_uint(self, buff, start, end):
        '''
            parse an integer from the buffer given the interval of bytes
        :param buff:
        :param start:
        :param end:
        
        '''
        return struct.unpack_from(self.ustructmap[end - start], buff, start)[0]