P25 work in progress.

Adds parsing of TDULC and LDU1 Link Control messages and LDU1 Low Speed Data ( 16-bit word).

src/decode/p25/message/ldu/lc/MessageUpdate.java

@@ -0,0 +1,58 @@
+package decode.p25.message.ldu.lc;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import decode.p25.message.ldu.LDU1Message;
+import decode.p25.reference.LinkControlOpcode;
+
+public class MessageUpdate extends LDU1Message
+{
+	private final static Logger mLog = 
+			LoggerFactory.getLogger( MessageUpdate.class );
+	public static final int[] SHORT_DATA_MESSAGE = { 364,365,366,367,372,373,
+		374,375,376,377,382,383,384,385,386,387 };
+	public static final int[] TARGET_ADDRESS = { 536,537,538,539,540,541,546,
+		547,548,549,550,551,556,557,558,559,560,561,566,567,568,569,570,571 };
+	public static final int[] SOURCE_ADDRESS = { 720,721,722,723,724,725,730,
+		731,732,733,734,735,740,741,742,743,744,745,750,751,752,753,754,755 };
+
+	public MessageUpdate( LDU1Message message )
+	{
+		super( message );
+	}
+	
+    @Override
+    public String getEventType()
+    {
+        return LinkControlOpcode.MESSAGE_UPDATE.getDescription();
+    }
+
+    public String getMessage()
+    {
+        StringBuilder sb = new StringBuilder();
+        
+        sb.append( getMessageStub() );
+
+        sb.append( " MSG:" + getShortDataMessage() );
+        sb.append( " SRC ADDR: " + getSourceAddress() );
+        sb.append( " TGT ADDR: " + getTargetAddress() );
+        
+        return sb.toString();
+    }
+    
+    public String getShortDataMessage()
+    {
+        return mMessage.getHex( SHORT_DATA_MESSAGE, 4 );
+    }
+    
+    public String getTargetAddress()
+    {
+    	return mMessage.getHex( TARGET_ADDRESS, 6 );
+    }
+    
+    public String getSourceAddress()
+    {
+    	return mMessage.getHex( SOURCE_ADDRESS, 6 );
+    }
+}