Add functions that returns remaining time in ZRTP discovery phase.

Patch from Damian Minkov.

src/gnu/java/zrtp/ZRtp.java

@@ -971,6 +971,22 @@ public byte[] getPeerZid() {
         return ret;
     }
 
+    /**
+     * Get remaining time before a "ZRTP not supported by other party" is reported.
+     * 
+     * This function calls the protocol state engine to determine how many time is left
+     * in ZRTP's discovery phase (Hello phase).
+     * 
+     * @return Time left in milliseconds.
+     */
+    public long getTimeoutValue() {
+        if(stateEngine != null) {
+            return stateEngine.getTimeoutValue();
+        }
+
+        return -1;
+    }
+
     /*
      * The following methods are helper functions for ZrtpStateClass.
      * ZrtpStateClass calls them to prepare packets, send data, report problems,

src/gnu/java/zrtp/ZrtpStateClass.java

@@ -208,6 +208,22 @@ protected ZrtpStateClass(ZRtp p) {
 
     }
 
+    public long getTimeoutValue() {
+        long res = 0;
+        int counter = 0;
+        int time = t1.start;
+
+        do {
+            res += time;
+            time += time;
+            time = (time > t1.capping)? t1.capping : time;
+            counter++;
+        }
+        while(counter < t1.maxResend);
+
+        return res;
+    }
+
     protected synchronized void processEvent(Event ev) {
 
         char first, middle, last;