From 165a6c76e8127bae7bdf16a9e9a4a24247f1dec4 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton@traccar.org>
Date: Fri, 8 Mar 2024 21:26:09 -0800
Subject: Fix Huabao frame encoder

---
 .../org/traccar/protocol/HuabaoFrameEncoder.java   | 22 ++++++++++------------
 1 file changed, 10 insertions(+), 12 deletions(-)

(limited to 'src/main/java/org/traccar')

diff --git a/src/main/java/org/traccar/protocol/HuabaoFrameEncoder.java b/src/main/java/org/traccar/protocol/HuabaoFrameEncoder.java
index 808529a98..5e48a466a 100644
--- a/src/main/java/org/traccar/protocol/HuabaoFrameEncoder.java
+++ b/src/main/java/org/traccar/protocol/HuabaoFrameEncoder.java
@@ -24,20 +24,18 @@ public class HuabaoFrameEncoder extends MessageToByteEncoder<ByteBuf> {
     @Override
     protected void encode(ChannelHandlerContext ctx, ByteBuf msg, ByteBuf out) {
 
+        int startIndex = msg.readerIndex();
         while (msg.isReadable()) {
+            int index = msg.readerIndex();
             int b = msg.readUnsignedByte();
-            switch (b) {
-                case 0x7d:
-                    out.writeByte(0x7d);
-                    out.writeByte(0x01);
-                    break;
-                case 0x7e:
-                    out.writeByte(0x7d);
-                    out.writeByte(0x02);
-                    break;
-                default:
-                    out.writeByte(b);
-                    break;
+            if (b == 0x7d) {
+                out.writeByte(0x7d);
+                out.writeByte(0x01);
+            } else if (b == 0x7e && index != startIndex && msg.isReadable()) {
+                out.writeByte(0x7d);
+                out.writeByte(0x02);
+            } else {
+                out.writeByte(b);
             }
         }
     }
-- 
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