#6 DMR Decoder (#947)

* #6 DMR decoder feature - work in progress

* #6 DMR Decoder.

* #6 DMR Decoder.  Code review updates.

Co-authored-by: Zhenyu Mao <maozhenyu@foxmail.com>
Co-authored-by: Denny <denny@denny-desktop>

src/main/java/io/github/dsheirer/bits/BinaryMessage.java

@@ -834,6 +834,24 @@ public class BinaryMessage extends BitSet
         return value;
     }
 
+    /**
+     * Returns the twos-complement value of the bits between start and end, inclusive
+     * @param start bit position
+     * @param end bit position
+     * @return twos complement value
+     */
+    public int getTwosComplement(int start, int end)
+    {
+        BinaryMessage sub = getSubMessage(start, end);
+        boolean negative = sub.get(start);
+        sub.flip(0, sub.size());
+
+        int value = sub.getInt(0, sub.size()) + 1;
+        value *= (negative ? -1 : 1);
+        return value;
+    }
+
+
     /**
      * Returns the long value represented by the bit range.  This method will
      * parse the bits in big endian or little endian format.  The start value

src/main/java/io/github/dsheirer/bits/SoftSyncDetector.java

@@ -33,6 +33,10 @@ public class SoftSyncDetector implements ISyncProcessor
         mThreshold = threshold;
     }
 
+    public SoftSyncDetector(long pattern, int threshold) {
+        mPattern = pattern;
+        mThreshold = threshold;
+    }
     public void dispose()
     {
         mListener = null;