void
rrToWire(DNSOutput out, Compression c, boolean canonical) {
	next.toWire(out, null, canonical);
	int length = bitmap.length();
	for (int i = 0, t = 0; i < length; i++) {
		t |= (bitmap.get(i) ? (1 << (7 - i % 8)) : 0);
		if (i % 8 == 7 || i == length - 1) {
			out.writeU8(t);
			t = 0;
		}
	}
}
Returns the set of types defined for this name
src/main/java/core/org/xbill/DNS/NXTRecord.java