SP ParseCIDR

stock void ParseCIDR(const char[] sCIDR, int &iStart, int &iEnd)
{
    char Pieces[2][32];

    ExplodeString(sCIDR, "/", Pieces, sizeof Pieces, sizeof Pieces[]);
    int baseip = NetAddr2Long(Pieces[0]);
    int prefix = StringToInt(Pieces[1]);

    if(prefix == 0) {
        LogError("CIDR prefix 0, clamping to 32. %s", sCIDR);
        prefix = 32;
    }

    int shift = 32 - prefix;
    int mask = (1 << shift) - 1;
    int start = baseip >> shift << shift;
    int end = start | mask;

    iStart = start;
    iEnd = end;
}