From 8d5b4ec5ec8e4aaa2c34793e3100a7782551afbd Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Tue, 12 Jul 2016 17:02:38 +1200
Subject: Fix issue in Hua Sheng frame decoder

---
 src/org/traccar/protocol/HuaShengFrameDecoder.java    | 19 ++++++++++++++++++-
 .../traccar/protocol/HuaShengFrameDecoderTest.java    |  8 ++++++++
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/src/org/traccar/protocol/HuaShengFrameDecoder.java b/src/org/traccar/protocol/HuaShengFrameDecoder.java
index 5d68fef9e..0e1becc30 100644
--- a/src/org/traccar/protocol/HuaShengFrameDecoder.java
+++ b/src/org/traccar/protocol/HuaShengFrameDecoder.java
@@ -16,6 +16,7 @@
 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.FrameDecoder;
@@ -34,7 +35,23 @@ public class HuaShengFrameDecoder extends FrameDecoder {
 
         int index = buf.indexOf(buf.readerIndex() + 1, buf.writerIndex(), (byte) 0xC0);
         if (index != -1) {
-            return buf.readBytes(index + 1 - buf.readerIndex());
+            ChannelBuffer result = ChannelBuffers.buffer(index + 1 - buf.readerIndex());
+
+            while (buf.readerIndex() <= index) {
+                int b = buf.readUnsignedByte();
+                if (b == 0xDB) {
+                    int ext = buf.readUnsignedByte();
+                    if (ext == 0xDC) {
+                        result.writeByte(0xC0);
+                    } else if (ext == 0xDD) {
+                        result.writeByte(0xDB);
+                    }
+                } else {
+                    result.writeByte(b);
+                }
+            }
+
+            return result;
         }
 
         return null;
diff --git a/test/org/traccar/protocol/HuaShengFrameDecoderTest.java b/test/org/traccar/protocol/HuaShengFrameDecoderTest.java
index 56b8f210c..c3f5c585f 100644
--- a/test/org/traccar/protocol/HuaShengFrameDecoderTest.java
+++ b/test/org/traccar/protocol/HuaShengFrameDecoderTest.java
@@ -19,6 +19,14 @@ public class HuaShengFrameDecoderTest extends ProtocolTest {
                 binary("c0010c003e0002000000000010020012a0014f42445f3347315f56312e302e330013a0043335353835353035303434303635380006a08701000006a0a1035fc0"),
                 decoder.decode(null, null, binary("c0010c003e0002000000000010020012a0014f42445f3347315f56312e302e330013a0043335353835353035303434303635380006a08701000006a0a1035fc0")));
 
+        Assert.assertEquals(
+                binary("c00000003faa0000000000003ea5a5005a3f00c000000031363037303530373132353700e6d186ffcc7a25002201160010000000010015000000000000000000c0"),
+                decoder.decode(null, null, binary("c00000003faa0000000000003ea5a5005a3f00dbdc00000031363037303530373132353700e6d186ffcc7a25002201160010000000010015000000000000000000c0")));
+
+        Assert.assertEquals(
+                binary("C000000041AA00000000000030C000000031353035323630373538323800ADDCC100226AEF0000000000120005000100151206EF0504E99975002903EB80556492CEC0"),
+                decoder.decode(null, null, binary("C000000041AA00000000000030DBDC00000031353035323630373538323800ADDCC100226AEF0000000000120005000100151206EF0504E99975002903EB80556492CEC0")));
+
     }
 
 }
-- 
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