Class RandBin

scapy/volatile.py:546–572

class RandBin(_RandString[bytes]):
    _DEFAULT_CHARS = b"".join(chb(c) for c in range(256))

    def __init__(self, size=None, chars=_DEFAULT_CHARS):
        # type: (Optional[Union[int, RandNum]], bytes) -> None
        if size is None:
            size = RandNumExpo(0.01)
        self.size = size
        self.chars = chars

    def _command_args(self):
        # type: () -> str
        if not isinstance(self.size, VolatileValue):
            return "size=%r" % self.size

        if isinstance(self.size, RandNumExpo) and \
                self.size.lambd == 0.01 and self.size.base == 0:
            # Default size for RandString, skip
            return ""
        return "size=%r" % self.size.command()

    def _fix(self):
        # type: () -> bytes
        s = b""
        for _ in range(int(self.size)):
            s += struct.pack("!B", random.choice(self.chars))
        return s


class RandTermString(RandBin):