Class ThreeBytesField

scapy/fields.py:1068–1079

class ThreeBytesField(Field[int, int]):
    def __init__(self, name, default):
        # type: (str, int) -> None
        Field.__init__(self, name, default, "!I")

    def addfield(self, pkt, s, val):
        # type: (Packet, bytes, Optional[int]) -> bytes
        return s + struct.pack(self.fmt, self.i2m(pkt, val))[1:4]

    def getfield(self, pkt, s):
        # type: (Packet, bytes) -> Tuple[bytes, int]
        return s[3:], self.m2i(pkt, struct.unpack(self.fmt, b"\x00" + s[:3])[0])  # noqa: E501


class X3BytesField(ThreeBytesField, XByteField):