From c72c0b15ea8cfd0d2642e05af94a876fe525e447 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Sun, 11 Aug 2013 01:38:22 +1200
Subject: Implement Aplicom protocol (fix #202)

---
 src/org/traccar/protocol/AplicomFrameDecoder.java | 59 +++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 src/org/traccar/protocol/AplicomFrameDecoder.java

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

diff --git a/src/org/traccar/protocol/AplicomFrameDecoder.java b/src/org/traccar/protocol/AplicomFrameDecoder.java
new file mode 100644
index 000000000..7dec3b511
--- /dev/null
+++ b/src/org/traccar/protocol/AplicomFrameDecoder.java
@@ -0,0 +1,59 @@
+/*
+ * 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 AplicomFrameDecoder extends FrameDecoder{
+    
+    @Override
+    protected Object decode(
+            ChannelHandlerContext ctx,
+            Channel channel,
+            ChannelBuffer buf) throws Exception {
+        
+        // Check minimum length
+        if (buf.readableBytes() < 11) {
+            return null;
+        }
+
+        // Read flags
+        int version = buf.getUnsignedByte(buf.readerIndex() + 1);
+        int offset = 1 + 1 + 3;
+        if ((version & 0x80) != 0) {
+            offset += 4;
+        }
+
+        // Get data length
+        int length = buf.getUnsignedShort(buf.readerIndex() + offset);
+        offset += 2;
+        if ((version & 0x40) != 0) {
+            offset += 3;
+        }
+        length += offset; // add header
+
+        // Return buffer
+        if (buf.readableBytes() >= length) {
+            return buf.readBytes(length);
+        }
+
+        return null;
+    }
+
+}
-- 
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