From 4acc359d664db81242f6c3a1a7a6dedcf2ab465a Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Mon, 26 Oct 2015 12:27:41 +1300
Subject: Modify JT600 frame decoder

---
 src/org/traccar/protocol/Jt600FrameDecoder.java | 26 +++++++++----------------
 1 file changed, 9 insertions(+), 17 deletions(-)

(limited to 'src/org/traccar/protocol/Jt600FrameDecoder.java')

diff --git a/src/org/traccar/protocol/Jt600FrameDecoder.java b/src/org/traccar/protocol/Jt600FrameDecoder.java
index 8b8f4f642..22bbd5514 100644
--- a/src/org/traccar/protocol/Jt600FrameDecoder.java
+++ b/src/org/traccar/protocol/Jt600FrameDecoder.java
@@ -26,34 +26,26 @@ public class Jt600FrameDecoder extends FrameDecoder {
 
     @Override
     protected Object decode(
-            ChannelHandlerContext ctx,
-            Channel channel,
-            ChannelBuffer buf) throws Exception {
+            ChannelHandlerContext ctx, Channel channel, ChannelBuffer buf) throws Exception {
 
-        // Check minimum length
-        int available = buf.readableBytes();
-        if (available < 10) {
+        if (buf.readableBytes() < 10) {
             return null;
         }
 
-        // Message identifier
-        char first = (char) buf.getByte(buf.readerIndex());
+        char type = (char) buf.getByte(buf.readerIndex());
 
-        if (first == '$') {
-            // Check length
+        if (type == '$') {
             int length = buf.getUnsignedShort(buf.readerIndex() + 7) + 10;
-            if (length >= available) {
+            if (length >= buf.readableBytes()) {
                 return buf.readBytes(length);
             }
-        } else if (first == '(') {
-            // Find ending
-            Integer endIndex = ChannelBufferTools.find(buf, buf.readerIndex(), available, ")");
-            if (endIndex != null) {
+        } else if (type == '(') {
+            int endIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) ')');
+            if (endIndex != -1) {
                 return buf.readBytes(endIndex + 1);
             }
         } else {
-            // Unknown message
-            throw new ParseException(null, 0);
+            throw new ParseException(null, 0); // unknown message
         }
 
         return null;
-- 
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