From 81e6d5825615fbe0be253e500b2c997f304349e6 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Sun, 1 Oct 2017 08:56:53 +1300
Subject: Workaround for GT06 frame decoder

---
 src/org/traccar/protocol/Gt06FrameDecoder.java | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

(limited to 'src/org/traccar/protocol/Gt06FrameDecoder.java')

diff --git a/src/org/traccar/protocol/Gt06FrameDecoder.java b/src/org/traccar/protocol/Gt06FrameDecoder.java
index 9b93979e4..c8b5e56ae 100644
--- a/src/org/traccar/protocol/Gt06FrameDecoder.java
+++ b/src/org/traccar/protocol/Gt06FrameDecoder.java
@@ -38,17 +38,18 @@ public class Gt06FrameDecoder extends FrameDecoder {
             length += 2 + buf.getUnsignedShort(buf.readerIndex() + 2);
         }
 
-        if (buf.readableBytes() >= length) {
-            if (buf.getUnsignedShort(buf.readerIndex() + length - 2) == 0x0d0a) {
-                return buf.readBytes(length);
-            } else {
-                int endIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) 0x0d);
-                if (endIndex > 0 && buf.writerIndex() > endIndex + 1 && buf.getByte(endIndex + 1) == 0x0a) {
-                    return buf.readBytes(endIndex + 2 - buf.readerIndex());
-                }
-            }
+        if (buf.readableBytes() >= length && buf.getUnsignedShort(buf.readerIndex() + length - 2) == 0x0d0a) {
+            return buf.readBytes(length);
         }
 
+        int endIndex = buf.readerIndex() - 1;
+        do {
+            endIndex = buf.indexOf(endIndex + 1, buf.writerIndex(), (byte) 0x0d);
+            if (endIndex > 0 && buf.writerIndex() > endIndex + 1 && buf.getByte(endIndex + 1) == 0x0a) {
+                return buf.readBytes(endIndex + 2 - buf.readerIndex());
+            }
+        } while (endIndex > 0);
+
         return null;
     }
 
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