1 files changed, 56 insertions, 0 deletions
diff --git a/src/de/blinkt/openvpn/CIDRIP.java b/src/de/blinkt/openvpn/CIDRIP.java
new file mode 100644
index 00000000..c2f0d821
--- /dev/null
+++ b/src/de/blinkt/openvpn/CIDRIP.java
@@ -0,0 +1,56 @@
+package de.blinkt.openvpn;
+
+class CIDRIP{
+	String mIp;
+	int len;
+	public CIDRIP(String ip, String mask){
+		mIp=ip;
+		String[] ipt = mask.split("\\.");
+		long netmask=0;
+
+		netmask += Long.parseLong(ipt[0])<< 24;
+		netmask += Integer.parseInt(ipt[1])<< 16;
+		netmask += Integer.parseInt(ipt[2])<< 8;
+		netmask += Integer.parseInt(ipt[3]);
+
+		// 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("%s/%d",mIp,len);
+	}
+
+	public boolean normalise(){
+		long ip=0;
+
+		String[] ipt = mIp.split("\\.");
+
+		ip += Long.parseLong(ipt[0])<< 24;
+		ip += Integer.parseInt(ipt[1])<< 16;
+		ip += Integer.parseInt(ipt[2])<< 8;
+		ip += Integer.parseInt(ipt[3]);
+
+		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;
+		}
+	}
+}
+\ No newline at end of file