How to use the regipy.registry.Cell function in regipy

def iter_cells(self, stream):
        stream.seek(self.hbin_data_offset)
        offset = stream.tell()
        while offset < self.hbin_data_offset + self.header.size - HBIN_HEADER.sizeof():
            hbin_cell_size = Int32sl.parse_stream(stream)

            # If the cell size is positive, it means it is unallocated. We are not interested in those on a regular run
            if hbin_cell_size >= 0:
                continue

            bytes_to_read = (hbin_cell_size * -1) - 4

            cell_type = Bytes(2).parse_stream(stream)

            # Yield the cell
            yield Cell(cell_type=cell_type.decode(), offset=stream.tell(), size=bytes_to_read)

            # Go to the next cell
            offset += stream.tell() + bytes_to_read

if signature in [HASH_LEAF_SIGNATURE, FAST_LEAF_SIGNATURE]:
            subkeys = LF_LH_SK_ELEMENT.parse_stream(stream)
        elif signature == LEAF_INDEX_SIGNATURE:
            subkeys = INDEX_LEAF.parse_stream(stream)
        else:
            raise RegistryParsingException(f'Expected a known signature, got: {signature} at offset {stream.tell()}')

        for subkey in subkeys.elements:
            stream.seek(REGF_HEADER_SIZE + subkey.key_node_offset)

            # This cell should always be allocated, therefor we expect a negative size
            cell_size = Int32sl.parse_stream(stream) * -1

            # We read to this offset and skip 2 bytes, because that is the cell size we just read
            nk_cell = Cell(cell_type='nk', offset=stream.tell() + 2, size=cell_size)
            nk_record = NKRecord(cell=nk_cell, stream=stream)
            yield nk_record