From d4f33f724b82154e3dd6f8fb8546cbc37b164ba5 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Mon, 18 Mar 2013 22:47:15 +1300
Subject: Add Cellocator protocol

---
 .../traccar/protocol/CellocatorFrameDecoder.java   | 70 ++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 src/org/traccar/protocol/CellocatorFrameDecoder.java

(limited to 'src/org/traccar/protocol/CellocatorFrameDecoder.java')

diff --git a/src/org/traccar/protocol/CellocatorFrameDecoder.java b/src/org/traccar/protocol/CellocatorFrameDecoder.java
new file mode 100644
index 000000000..cddb33d52
--- /dev/null
+++ b/src/org/traccar/protocol/CellocatorFrameDecoder.java
@@ -0,0 +1,70 @@
+/*
+ * Copyright 2013 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.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.protocol;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.channel.Channel;
+import org.jboss.netty.channel.ChannelHandlerContext;
+import org.jboss.netty.handler.codec.frame.FrameDecoder;
+
+public class CellocatorFrameDecoder extends FrameDecoder {
+
+    private static final int MESSAGE_MINIMUM_LENGTH = 15;
+    
+    @Override
+    protected Object decode(
+            ChannelHandlerContext ctx,
+            Channel channel,
+            ChannelBuffer buf) throws Exception {
+        
+        // Check minimum length
+        int available = buf.readableBytes();
+        if (available < MESSAGE_MINIMUM_LENGTH) {
+            return null;
+        }
+
+        // Size depending on message type
+        int length = 0;
+        switch (buf.getUnsignedByte(4))
+        {
+            case CellocatorProtocolDecoder.MSG_CLIENT_STATUS:
+                length = 70;
+                break;
+            case CellocatorProtocolDecoder.MSG_CLIENT_PROGRAMMING:
+                length = 31;
+                break;
+            case CellocatorProtocolDecoder.MSG_CLIENT_SERIAL_LOG:
+                length = 70;
+                break;
+            case CellocatorProtocolDecoder.MSG_CLIENT_SERIAL:
+                if (available >= 19) {
+                    length = 19 + buf.getUnsignedShort(16);
+                }
+                break;
+            case CellocatorProtocolDecoder.MSG_CLIENT_MODULAR:
+                length = 15 + buf.getUnsignedByte(13);
+                break;
+        }
+
+        // Read packet
+        if (length > 0 && available >= length) {
+            return buf.readBytes(length + 2);
+        }
+        
+        return null;
+    }
+
+}
-- 
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