Class CountedString

scapy/layers/ms_nrtp.py:53–82

class CountedString(Packet):
    fields_desc = [
        ByteEnumField(
            "StringEncoding",
            0,
            {
                0: "Unicode",
                1: "UTF8",
            },
        ),
        FieldLenField("Length", None, fmt="<I", count_of="StringData"),
        MultipleTypeField(
            [
                (
                    StrLenFieldUtf16(
                        "StringData", "", length_from=lambda pkt: pkt.Length
                    ),
                    lambda pkt: pkt.StringEncoding == 0,
                ),
                (
                    StrLenField("StringData", "", length_from=lambda pkt: pkt.Length),
                    lambda pkt: pkt.StringEncoding == 1,
                ),
            ],
            StrLenField("StringData", "", length_from=lambda pkt: pkt.Length),
        ),
    ]

    def default_payload_class(self, payload):
        return conf.padding_layer


CountedStringField = lambda name: PacketField(name, CountedString(), CountedString)