From d2cc0c9370fd9713e674f0f8622d35296f041d17 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Wed, 21 Jan 2015 13:30:01 +1300
Subject: Begin AutoFon protocol implementation

---
 src/org/traccar/protocol/AutoFonFrameDecoder.java | 61 +++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 src/org/traccar/protocol/AutoFonFrameDecoder.java

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

diff --git a/src/org/traccar/protocol/AutoFonFrameDecoder.java b/src/org/traccar/protocol/AutoFonFrameDecoder.java
new file mode 100644
index 000000000..f4b5c8f0b
--- /dev/null
+++ b/src/org/traccar/protocol/AutoFonFrameDecoder.java
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2015 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 AutoFonFrameDecoder extends FrameDecoder {
+
+    private static final int MSG_LOGIN = 0x10;
+    private static final int MSG_LOCATION = 0x11;
+    private static final int MSG_HISTORY = 0x12;
+
+    @Override
+    protected Object decode(
+            ChannelHandlerContext ctx,
+            Channel channel,
+            ChannelBuffer buf) throws Exception {
+        
+        // Check minimum length
+        if (buf.readableBytes() < 12) {
+            return null;
+        }
+
+        int length = 0;
+        switch (buf.getUnsignedByte(buf.readerIndex())) {
+            case MSG_LOGIN:
+                length = 12;
+                break;
+            case MSG_LOCATION:
+                length = 78;
+                break;
+            case MSG_HISTORY:
+                length = 257;
+                break;
+        }
+        
+        // Check length and return buffer
+        if (length != 0 && buf.readableBytes() >= length) {
+            return buf.readBytes(length);
+        }
+
+        return null;
+    }
+
+}
-- 
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