From e6cea680c6d4ae362e120e6537e84428507b4781 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Fri, 16 Jun 2017 00:55:14 +1200
Subject: Update Atrack frame decoder

---
 src/org/traccar/protocol/AtrackFrameDecoder.java   | 45 ++++++++++++++++------
 .../traccar/protocol/AtrackFrameDecoderTest.java   | 28 ++++++++++++++
 2 files changed, 61 insertions(+), 12 deletions(-)
 create mode 100644 test/org/traccar/protocol/AtrackFrameDecoderTest.java

diff --git a/src/org/traccar/protocol/AtrackFrameDecoder.java b/src/org/traccar/protocol/AtrackFrameDecoder.java
index a075254ea..3c7d287fe 100644
--- a/src/org/traccar/protocol/AtrackFrameDecoder.java
+++ b/src/org/traccar/protocol/AtrackFrameDecoder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2013 - 2014 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,27 +18,48 @@ 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.LengthFieldBasedFrameDecoder;
+import org.jboss.netty.handler.codec.frame.FrameDecoder;
+import org.traccar.helper.StringFinder;
 
-public class AtrackFrameDecoder extends LengthFieldBasedFrameDecoder {
+public class AtrackFrameDecoder extends FrameDecoder {
 
     private static final int KEEPALIVE_LENGTH = 12;
 
-    public AtrackFrameDecoder() {
-        super(1024, 4, 2);
-    }
-
     @Override
     protected Object decode(
             ChannelHandlerContext ctx, Channel channel, ChannelBuffer buf) throws Exception {
 
-        // Keep alive message
-        if (buf.readableBytes() >= KEEPALIVE_LENGTH
-                && buf.getUnsignedShort(buf.readerIndex()) == 0xfe02) {
-            return buf.readBytes(KEEPALIVE_LENGTH);
+        if (buf.readableBytes() >= 2) {
+
+            if (buf.getUnsignedShort(buf.readerIndex()) == 0xfe02) {
+
+                if (buf.readableBytes() >= KEEPALIVE_LENGTH) {
+                    return buf.readBytes(KEEPALIVE_LENGTH);
+                }
+
+            } else if (buf.getUnsignedShort(buf.readerIndex()) == 0x4050) {
+
+                if (buf.readableBytes() > 6) {
+                    int length = buf.getUnsignedShort(buf.readerIndex() + 4) + 4 + 2;
+                    if (buf.readableBytes() >= length) {
+                        return buf.readBytes(length);
+                    }
+                }
+
+            } else {
+
+                int endIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), new StringFinder("\r\n"));
+                if (endIndex > 0) {
+                    ChannelBuffer frame = buf.readBytes(endIndex - buf.readerIndex());
+                    buf.skipBytes(2);
+                    return frame;
+                }
+
+            }
+
         }
 
-        return super.decode(ctx, channel, buf);
+        return null;
     }
 
 }
diff --git a/test/org/traccar/protocol/AtrackFrameDecoderTest.java b/test/org/traccar/protocol/AtrackFrameDecoderTest.java
new file mode 100644
index 000000000..60b338cca
--- /dev/null
+++ b/test/org/traccar/protocol/AtrackFrameDecoderTest.java
@@ -0,0 +1,28 @@
+package org.traccar.protocol;
+
+import org.junit.Assert;
+import org.junit.Test;
+import org.traccar.ProtocolTest;
+
+public class AtrackFrameDecoderTest extends ProtocolTest {
+
+    @Test
+    public void testDecode() throws Exception {
+
+        AtrackFrameDecoder decoder = new AtrackFrameDecoder();
+
+        Assert.assertEquals(
+                binary("244F4B"),
+                decoder.decode(null, null, binary("244F4B0D0A")));
+
+        Assert.assertEquals(
+                binary("fe0200014104d8f196820001"),
+                decoder.decode(null, null, binary("fe0200014104d8f196820001")));
+
+        Assert.assertEquals(
+                binary("40501e58003301e000014104d8f19682525ecd5d525ee344525ee35effc88815026ab4d70000020000104403de01000b0000000007d007d000"),
+                decoder.decode(null, null, binary("40501e58003301e000014104d8f19682525ecd5d525ee344525ee35effc88815026ab4d70000020000104403de01000b0000000007d007d000")));
+
+    }
+
+}
-- 
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