public long
readU32() throws WireParseException {
	require(4);
	return (byteBuffer.getInt() & 0xFFFFFFFFL);
}
Reads an unsigned 32 bit value from the stream, as a long.
@return An unsigned 32 bit value.
@throws WireParseException The end of the stream was reached.
src/main/java/core/org/xbill/DNS/DNSInput.java