From a960f770f1c8d52b2c9f6b63cf947f69d7d7e761 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Sun, 23 Feb 2014 19:55:15 +1300
Subject: Implement STL060 protocol

---
 src/org/traccar/protocol/Stl060FrameDecoder.java | 57 ++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 src/org/traccar/protocol/Stl060FrameDecoder.java

(limited to 'src/org/traccar/protocol/Stl060FrameDecoder.java')

diff --git a/src/org/traccar/protocol/Stl060FrameDecoder.java b/src/org/traccar/protocol/Stl060FrameDecoder.java
new file mode 100644
index 000000000..eb0894fb7
--- /dev/null
+++ b/src/org/traccar/protocol/Stl060FrameDecoder.java
@@ -0,0 +1,57 @@
+/*
+ * Copyright 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.
+ * 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.buffer.ChannelBuffers;
+import org.jboss.netty.channel.Channel;
+import org.jboss.netty.channel.ChannelHandlerContext;
+import org.jboss.netty.handler.codec.frame.DelimiterBasedFrameDecoder;
+import org.traccar.helper.ChannelBufferTools;
+
+public class Stl060FrameDecoder extends DelimiterBasedFrameDecoder {
+
+    private static final byte delimiter[] = { (byte) '#' };
+    
+    public Stl060FrameDecoder(int maxFrameLength) {
+        super(maxFrameLength, ChannelBuffers.wrappedBuffer(delimiter));
+    }
+    
+    @Override
+    protected Object decode(
+            ChannelHandlerContext ctx,
+            Channel channel,
+            ChannelBuffer buf) throws Exception {
+        
+        ChannelBuffer result = (ChannelBuffer) super.decode(ctx, channel, buf);
+        
+        if (result != null) {
+            
+            Integer beginIndex = ChannelBufferTools.find(
+                    result, 0, result.readableBytes(), "$");
+            if (beginIndex == null) {
+                return result;
+            } else {
+                result.skipBytes(beginIndex);
+                return result.readBytes(result.readableBytes());
+            }
+
+        }
+
+        return null;
+    }
+
+}
-- 
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