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/*
* Copyright (c) 2012-2014 Arne Schwabe
* Distributed under the GNU GPL v2 with additional terms. For full terms see the file doc/LICENSE.txt
*/
package de.blinkt.openvpn.core;
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;
}
}
public CIDRIP(String address, int prefix_length) {
len = prefix_length;
mIp = address;
}
@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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