def from_text()

in functions/source/populate_NLB_TG_with_ALB/dns/rdtypes/ANY/NSEC3.py [0:0]

• 48 lines of code
• 11 McCabe index (conditional complexity)

    def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True):
        algorithm = tok.get_uint8()
        flags = tok.get_uint8()
        iterations = tok.get_uint16()
        salt = tok.get_string()
        if salt == u'-':
            salt = b''
        else:
            salt = binascii.unhexlify(salt.encode('ascii'))
        next = tok.get_string().encode(
            'ascii').upper().translate(b32_hex_to_normal)
        next = base64.b32decode(next)
        rdtypes = []
        while 1:
            token = tok.get().unescape()
            if token.is_eol_or_eof():
                break
            nrdtype = dns.rdatatype.from_text(token.value)
            if nrdtype == 0:
                raise dns.exception.SyntaxError("NSEC3 with bit 0")
            if nrdtype > 65535:
                raise dns.exception.SyntaxError("NSEC3 with bit > 65535")
            rdtypes.append(nrdtype)
        rdtypes.sort()
        window = 0
        octets = 0
        prior_rdtype = 0
        bitmap = bytearray(b'\0' * 32)
        windows = []
        for nrdtype in rdtypes:
            if nrdtype == prior_rdtype:
                continue
            prior_rdtype = nrdtype
            new_window = nrdtype // 256
            if new_window != window:
                if octets != 0:
                    windows.append((window, ''.join(bitmap[0:octets])))
                bitmap = bytearray(b'\0' * 32)
                window = new_window
            offset = nrdtype % 256
            byte = offset // 8
            bit = offset % 8
            octets = byte + 1
            bitmap[byte] = bitmap[byte] | (0x80 >> bit)
        if octets != 0:
            windows.append((window, bitmap[0:octets]))
        return cls(rdclass, rdtype, algorithm, flags, iterations, salt, next,
                   windows)