public void
writeU16At(int val, int where) {
	check(val, 16);
	if (where > pos - 2)
		throw new IllegalArgumentException("cannot write past " +
						   "end of data");
	array[where++] = (byte)((val >>> 8) & 0xFF);
	array[where++] = (byte)(val & 0xFF);
}
Writes an unsigned 16 bit value to the specified position in the stream.
@param val The value to be written
@param where The position to write the value.
src/main/java/core/org/xbill/DNS/DNSOutput.java