From 841965ba439654f76dcd7fc63efd70647f23f29f Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Fri, 5 May 2017 13:31:48 +1200
Subject: Implement PT510 frame decoder workaround

---
 src/org/traccar/protocol/Pt502FrameDecoder.java    | 28 +++++++---------------
 .../traccar/protocol/Pt502FrameDecoderTest.java    | 10 +++++++-
 2 files changed, 18 insertions(+), 20 deletions(-)

diff --git a/src/org/traccar/protocol/Pt502FrameDecoder.java b/src/org/traccar/protocol/Pt502FrameDecoder.java
index 200012965..ce20dff1f 100644
--- a/src/org/traccar/protocol/Pt502FrameDecoder.java
+++ b/src/org/traccar/protocol/Pt502FrameDecoder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2014 Anton Tananaev (anton@traccar.org)
+ * Copyright 2014 - 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.
@@ -32,25 +32,15 @@ public class Pt502FrameDecoder extends FrameDecoder {
             return null;
         }
 
-        if (buf.getUnsignedByte(buf.readerIndex()) == 0xbf && buf.getUnsignedByte(buf.readerIndex() + 1) == 0xfb) {
-
-            int length = buf.getShort(buf.readerIndex() + 3);
-            if (buf.readableBytes() >= length) {
-                buf.skipBytes(BINARY_HEADER);
-                ChannelBuffer result = buf.readBytes(length - BINARY_HEADER - 2);
-                buf.skipBytes(2);
-                return result;
-            }
-
-        } else {
-
-            int index = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) '\n');
-            if (index != -1) {
-                ChannelBuffer result = buf.readBytes(index - 1);
-                buf.skipBytes(2);
-                return result;
-            }
+        if (buf.getUnsignedByte(buf.readerIndex()) == 0xbf) {
+            buf.skipBytes(BINARY_HEADER);
+        }
 
+        int index = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) '\r');
+        if (index != -1 && index + 1 < buf.writerIndex()) {
+            ChannelBuffer result = buf.readBytes(index - buf.readerIndex());
+            buf.skipBytes(2);
+            return result;
         }
 
         return null;
diff --git a/test/org/traccar/protocol/Pt502FrameDecoderTest.java b/test/org/traccar/protocol/Pt502FrameDecoderTest.java
index 34fdf9bb9..44de2459d 100644
--- a/test/org/traccar/protocol/Pt502FrameDecoderTest.java
+++ b/test/org/traccar/protocol/Pt502FrameDecoderTest.java
@@ -13,9 +13,17 @@ public class Pt502FrameDecoderTest extends ProtocolTest {
 
         Pt502FrameDecoder decoder = new Pt502FrameDecoder();
 
+        Assert.assertEquals(
+                binary("244655533836353332383032363234333836342c3531302d56312e31322c4131312d56332e30"),
+                decoder.decode(null, null, binary(ByteOrder.LITTLE_ENDIAN, "bffb192d00244655533836353332383032363234333836342c3531302d56312e31322c4131312d56332e300d0d")));
+
+        Assert.assertEquals(
+                binary("24504f532c3836353332383032363234333836342c3134343733352e3030302c412c313333322e373038332c4e2c3230342e363833312c452c302e302c3233302e30302c3032303531372c2c2c412f30303030302c31302f312c302f3233342f2f4646392f"),
+                decoder.decode(null, null, binary(ByteOrder.LITTLE_ENDIAN, "24504f532c3836353332383032363234333836342c3134343733352e3030302c412c313333322e373038332c4e2c3230342e363833312c452c302e302c3233302e30302c3032303531372c2c2c412f30303030302c31302f312c302f3233342f2f4646392f0d0a")));
+
         Assert.assertEquals(
                 binary("24504f532c3335333435313030303136342c3038323430352e3030302c412c313235342e383530312c4e2c31303035312e363735322c452c302e30302c3233372e39392c3136303531332c2c2c412f303030302c302f302f35353030302f2f6137312f"),
-                decoder.decode(null, null, binary("24504f532c3335333435313030303136342c3038323430352e3030302c412c313235342e383530312c4e2c31303035312e363735322c452c302e30302c3233372e39392c3136303531332c2c2c412f303030302c302f302f35353030302f2f6137312f0d0a")));
+                decoder.decode(null, null, binary(ByteOrder.LITTLE_ENDIAN, "24504f532c3335333435313030303136342c3038323430352e3030302c412c313235342e383530312c4e2c31303035312e363735322c452c302e30302c3233372e39392c3136303531332c2c2c412f303030302c302f302f35353030302f2f6137312f0d0a")));
 
         Assert.assertEquals(
                 binary("24504f532c3335333435313030303136342c3038323430352e3030302c412c313235342e383530312c4e2c31303035312e363735322c452c302e30302c3233372e39392c3136303531332c2c2c412f303030302c302f302f35353030302f2f6137312f"),
-- 
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