private long
parseUInt32(String s) {
	if (!Character.isDigit(s.charAt(0)))
		return -1;
	try {
		long l = Long.parseLong(s);
		if (l < 0 || l > 0xFFFFFFFFL)
			return -1;
		return l;
	}
	catch (NumberFormatException e) {
		return -1;
	}
}
Initializes the master file reader.
@param in The input stream containing a master file.
src/main/java/core/org/xbill/DNS/Master.java