From e336615dbed3f261dd2b42de475b5d1f2a63c6f9 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Wed, 17 Apr 2019 00:39:46 -0700
Subject: Improve frame decoder

---
 .../java/org/traccar/protocol/ItsFrameDecoder.java | 36 ++++++++++++++--------
 .../org/traccar/protocol/ItsFrameDecoderTest.java  |  8 +++++
 2 files changed, 31 insertions(+), 13 deletions(-)

diff --git a/src/main/java/org/traccar/protocol/ItsFrameDecoder.java b/src/main/java/org/traccar/protocol/ItsFrameDecoder.java
index 79b341760..eb2c59e91 100644
--- a/src/main/java/org/traccar/protocol/ItsFrameDecoder.java
+++ b/src/main/java/org/traccar/protocol/ItsFrameDecoder.java
@@ -19,30 +19,40 @@ import io.netty.buffer.ByteBuf;
 import io.netty.channel.Channel;
 import io.netty.channel.ChannelHandlerContext;
 import org.traccar.BaseFrameDecoder;
+import org.traccar.helper.BufferUtil;
 
 public class ItsFrameDecoder extends BaseFrameDecoder {
 
+    private static final int MINIMUM_LENGTH = 20;
+
     @Override
     protected Object decode(
             ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
 
-        int delimiterIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) '*');
-
-        if (buf.writerIndex() > delimiterIndex + 1 && buf.getByte(delimiterIndex + 1) == '*') {
-            delimiterIndex += 1;
-        }
-
         ByteBuf frame;
-        if (buf.getByte(delimiterIndex - 2) == ',') {
-            frame = buf.readRetainedSlice(delimiterIndex - 1 - buf.readerIndex());
-            buf.skipBytes(1); // binary checksum
-        } else {
+        int delimiterIndex = BufferUtil.indexOf("\r\n", buf);;
+        if (delimiterIndex > MINIMUM_LENGTH) {
             frame = buf.readRetainedSlice(delimiterIndex - buf.readerIndex());
+            buf.skipBytes(2);
+            return frame;
+        } else {
+            delimiterIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) '*');
+            if (delimiterIndex > MINIMUM_LENGTH) {
+                if (buf.writerIndex() > delimiterIndex + 1 && buf.getByte(delimiterIndex + 1) == '*') {
+                    delimiterIndex += 1;
+                }
+                if (buf.getByte(delimiterIndex - 2) == ',') {
+                    frame = buf.readRetainedSlice(delimiterIndex - 1 - buf.readerIndex());
+                    buf.skipBytes(1); // binary checksum
+                } else {
+                    frame = buf.readRetainedSlice(delimiterIndex - buf.readerIndex());
+                }
+                buf.skipBytes(1); // delimiter
+                return frame;
+            }
         }
 
-        buf.skipBytes(1); // delimiter
-
-        return frame;
+        return null;
     }
 
 }
diff --git a/src/test/java/org/traccar/protocol/ItsFrameDecoderTest.java b/src/test/java/org/traccar/protocol/ItsFrameDecoderTest.java
index d7bd7d483..6112f773b 100644
--- a/src/test/java/org/traccar/protocol/ItsFrameDecoderTest.java
+++ b/src/test/java/org/traccar/protocol/ItsFrameDecoderTest.java
@@ -10,6 +10,14 @@ public class ItsFrameDecoderTest extends ProtocolTest {
 
         ItsFrameDecoder decoder = new ItsFrameDecoder();
 
+        verifyFrame(
+                binary("244865616465722c69547269616e676c65312c4b41303147313233342c3836343439353033343433343631302c315f333654303242303136344d4149535f362c4149533134302c302e3030303030302c4e2c302e3030303030302c452a3545"),
+                decoder.decode(null, null, binary("244865616465722c69547269616e676c65312c4b41303147313233342c3836343439353033343433343631302c315f333654303242303136344d4149535f362c4149533134302c302e3030303030302c4e2c302e3030303030302c452a35450d0a")));
+
+        verifyFrame(
+                binary("242c43502c41544c2c312e3444335f4149533134305f312e302c50432c31322c4c2c3836383732383033373731373434312c2c312c31363034323031392c3037333432372c32382e3633333533352c4e2c37372e3232323733332c452c302e302c3333392e30302c302c302e302c312e302c302e372c216465612c302c312c31332e372c332e392c302c4f2c32312c3430342c20342c38382c616433352c616437622c38382c32322c636661612c38382c31362c363666392c38382c31342c336632632c64372c31332c303131312c30302c3236303731312c"),
+                decoder.decode(null, null, binary("242c43502c41544c2c312e3444335f4149533134305f312e302c50432c31322c4c2c3836383732383033373731373434312c2c312c31363034323031392c3037333432372c32382e3633333533352c4e2c37372e3232323733332c452c302e302c3333392e30302c302c302e302c312e302c302e372c216465612c302c312c31332e372c332e392c302c4f2c32312c3430342c20342c38382c616433352c616437622c38382c32322c636661612c38382c31362c363666392c38382c31342c336632632c64372c31332c303131312c30302c3236303731312c3a2a2c4f2c532c2b393138373433393530333938")));
+
         verifyFrame(
                 binary("242c43502c41544c2c312e3444335f4149533134305f312e302c45412c31302c482c3836383732383033373731373434312c2c312c32393033323031392c3232353931332c32382e3533343031362c4e2c37372e3236383933362c452c302e302c34382e30302c302c302e302c312e322c302e372c216465612c302c312c31322e362c332e392c312c4f2c32322c3430342c20342c3161612c346230622c643433642c3161612c31352c643433622c3161612c31352c346230632c3161612c31342c346136322c3161612c31322c303131312c30302c3232313333322c"),
                 decoder.decode(null, null, binary("242c43502c41544c2c312e3444335f4149533134305f312e302c45412c31302c482c3836383732383033373731373434312c2c312c32393033323031392c3232353931332c32382e3533343031362c4e2c37372e3236383933362c452c302e302c34382e30302c302c302e302c312e322c302e372c216465612c302c312c31322e362c332e392c312c4f2c32322c3430342c20342c3161612c346230622c643433642c3161612c31352c643433622c3161612c31352c346230632c3161612c31342c346136322c3161612c31322c303131312c30302c3232313333322cbc2a")));
-- 
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