From abbe79284a3c78125fc655329a0656428dcb2920 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Mon, 20 Jan 2014 23:29:11 +1300
Subject: Extend meiligao id to IMEI

---
 src/org/traccar/helper/Crc.java                       | 17 +++++++++++++++++
 src/org/traccar/protocol/MeiligaoProtocolDecoder.java | 15 ++++++---------
 2 files changed, 23 insertions(+), 9 deletions(-)

(limited to 'src/org')

diff --git a/src/org/traccar/helper/Crc.java b/src/org/traccar/helper/Crc.java
index 5a668f30a..213d1192a 100644
--- a/src/org/traccar/helper/Crc.java
+++ b/src/org/traccar/helper/Crc.java
@@ -154,4 +154,21 @@ public class Crc {
         return String.format("*%02x", checksum).toUpperCase();
     }
 
+    public static String luhnChecksum(String s) {
+        int sum = 0;
+        boolean evenPosition = true;
+        for (int i = s.length() - 1; i >= 0; i--) {
+            int n = Integer.parseInt(s.substring(i, i + 1));
+            if (evenPosition) {
+                n *= 2;
+                if (n > 9) {
+                    n = (n % 10) + 1;
+                }
+            }
+            sum += n;
+            evenPosition = !evenPosition;
+        }
+        return String.valueOf(10 - sum % 10);
+    }    
+    
 }
diff --git a/src/org/traccar/protocol/MeiligaoProtocolDecoder.java b/src/org/traccar/protocol/MeiligaoProtocolDecoder.java
index b28b38dc8..7ad91a807 100644
--- a/src/org/traccar/protocol/MeiligaoProtocolDecoder.java
+++ b/src/org/traccar/protocol/MeiligaoProtocolDecoder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012 - 2013 Anton Tananaev (anton.tananaev@gmail.com)
+ * Copyright 2012 - 2014 Anton Tananaev (anton.tananaev@gmail.com)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -60,10 +60,7 @@ public class MeiligaoProtocolDecoder extends BaseProtocolDecoder {
             "(?:\\|([0-9a-fA-F]+))?" +          // Milage
             ".*"); // TODO: parse ADC
 
-    /**
-     * Parse device id
-     */
-    private String getId(ChannelBuffer buf) {
+    private String getImei(ChannelBuffer buf) {
         String id = "";
 
         for (int i = 0; i < 7; i++) {
@@ -80,7 +77,7 @@ public class MeiligaoProtocolDecoder extends BaseProtocolDecoder {
             id += d2;
         }
 
-        return id;
+        return id + Crc.luhnChecksum(id);
     }
 
     @Override
@@ -135,11 +132,11 @@ public class MeiligaoProtocolDecoder extends BaseProtocolDecoder {
         }
 
         // Get device by id
-        String id = getId(buf);
+        String imei = getImei(buf);
         try {
-            position.setDeviceId(getDataManager().getDeviceByImei(id).getId());
+            position.setDeviceId(getDataManager().getDeviceByImei(imei).getId());
         } catch(Exception error) {
-            Log.warning("Unknown device - " + id);
+            Log.warning("Unknown device - " + imei);
             return null;
         }
 
-- 
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