1 files changed, 70 insertions, 0 deletions
diff --git a/app/src/main/java/de/blinkt/openvpn/core/CIDRIP.java b/app/src/main/java/de/blinkt/openvpn/core/CIDRIP.java
new file mode 100644
index 00000000..960e7d11
--- /dev/null
+++ b/app/src/main/java/de/blinkt/openvpn/core/CIDRIP.java
@@ -0,0 +1,70 @@
+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);
+    }
+
+}
+\ No newline at end of file