strip leading zeros

[zsobolsky]

Hi Sean

I've got following ipadress : 010.019.020.30 (from legacy app ...) Is there a way to strip the leading zeros in the segments with this libary, like 10.19.20.30?

Best Regards, Zach

[seancfoley]

Yes. First you must decide if you wish to interpret the leading zero segments as octal. In general, that is how most software handles such addresses. For example, if you point a browser to http://010.010.010.010/ you will see it interpreted as http://8.8.8.8/.

In the example you have provided, it is not possible to interpret that address as octal because the second segment 019 has a nine in it.

So, you have to disallow octal when parsing, using IPAddressStringParameters.

static final IPAddressStringParameters params = 
    new IPAddressStringParameters.Builder().
        getIPv4AddressParametersBuilder().
        allow_inet_aton_octal(false).
        getParentBuilder().toParams();

static String parse(String str) throws AddressStringException {
    IPAddressString addrStr = new IPAddressString(str, params);
    IPAddress addr = addrStr.toAddress();
    return addr.toString();
}

System.out.println(parse("010.019.020.30"));

Output:

10.19.20.30