Class DCPControlBlock

scapy/contrib/pnio_dcp.py:417–433

class DCPControlBlock(Packet):
    fields_desc = [
        ByteEnumField("option", 5, DCP_OPTIONS),
        MultiEnumField("sub_option", 4, DCP_SUBOPTIONS, fmt='B',
                       depends_on=lambda p: p.option),
        LenField("dcp_block_length", 3),
        ByteEnumField("response", 2, DCP_OPTIONS),
        MultiEnumField("response_sub_option", 2, DCP_SUBOPTIONS, fmt='B',
                       depends_on=lambda p: p.option),
        ByteEnumField("block_error", 0, BLOCK_ERRORS),
        PadField(StrLenField("padding", b"\x00",
                             length_from=lambda p: p.dcp_block_length % 2), 1,
                 padwith=b"\x00")
    ]

    def extract_padding(self, s):
        return '', s


class DCPDeviceInitiativeBlock(Packet):