Method from_rdtypes

dns/rdtypes/util.py:170–194

(cls, rdtypes: List[dns.rdatatype.RdataType])

    @classmethod
    def from_rdtypes(cls, rdtypes: List[dns.rdatatype.RdataType]) -> "Bitmap":
        rdtypes = sorted(rdtypes)
        window = 0
        octets = 0
        prior_rdtype = 0
        bitmap = bytearray(b"\0" * 32)
        windows = []
        for rdtype in rdtypes:
            if rdtype == prior_rdtype:
                continue
            prior_rdtype = rdtype
            new_window = rdtype // 256
            if new_window != window:
                if octets != 0:
                    windows.append((window, bytes(bitmap[0:octets])))
                bitmap = bytearray(b"\0" * 32)
                window = new_window
            offset = rdtype % 256
            byte = offset // 8
            bit = offset % 8
            octets = byte + 1
            bitmap[byte] = bitmap[byte] | (0x80 >> bit)
        if octets != 0:
            windows.append((window, bytes(bitmap[0:octets])))
        return cls(windows)

    def to_wire(self, file: Any) -> None:
        for window, bitmap in self.windows: