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package de.blinkt.openvpn;
import java.util.Locale;
class CIDRIP{
String mIp;
int len;
public CIDRIP(String ip, String mask){
mIp=ip;
long netmask=getInt(mask);
// Add 33. bit to ensure the loop terminates
netmask += 1l << 32;
int lenZeros = 0;
while((netmask & 0x1) == 0) {
lenZeros++;
netmask = netmask >> 1;
}
// Check if rest of netmask is only 1s
if(netmask != (0x1ffffffffl >> lenZeros)) {
// Asume no CIDR, set /32
len=32;
} else {
len =32 -lenZeros;
}
}
@Override
public String toString() {
return String.format(Locale.ENGLISH,"%s/%d",mIp,len);
}
public boolean normalise(){
long ip=getInt(mIp);
long newip = ip & (0xffffffffl << (32 -len));
if (newip != ip){
mIp = String.format("%d.%d.%d.%d", (newip & 0xff000000) >> 24,(newip & 0xff0000) >> 16, (newip & 0xff00) >> 8 ,newip & 0xff);
return true;
} else {
return false;
}
}
static long getInt(String ipaddr) {
String[] ipt = ipaddr.split("\\.");
long ip=0;
ip += Long.parseLong(ipt[0])<< 24;
ip += Integer.parseInt(ipt[1])<< 16;
ip += Integer.parseInt(ipt[2])<< 8;
ip += Integer.parseInt(ipt[3]);
return ip;
}
public long getInt() {
return getInt(mIp);
}
}
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