Pack data. readoffset has to be increased by one, seems like HANA starts from 1, not zero.

def pack_data(self, remaining_size):
        """Pack data. readoffset has to be increased by one, seems like HANA starts from 1, not zero."""
        payload = self.part_struct.pack(self.locator_id, self.readoffset + 1, self.readlength, b'    ')
        return 4, payload