From e5a8be1987aecf3735801165ee19c1bcdd4fcc05 Mon Sep 17 00:00:00 2001
From: Valerii Vyshniak <valeravi@vi-soft.com.ua>
Date: Wed, 22 Nov 2017 02:05:59 +0100
Subject: T580W: review comments fixes 3, re-implemented tk103 frame decoder

---
 src/org/traccar/protocol/Tk103FrameDecoder.java | 66 +++++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 src/org/traccar/protocol/Tk103FrameDecoder.java

(limited to 'src/org/traccar/protocol/Tk103FrameDecoder.java')

diff --git a/src/org/traccar/protocol/Tk103FrameDecoder.java b/src/org/traccar/protocol/Tk103FrameDecoder.java
new file mode 100644
index 000000000..17e791553
--- /dev/null
+++ b/src/org/traccar/protocol/Tk103FrameDecoder.java
@@ -0,0 +1,66 @@
+/*
+ * Copyright 2017 Valerii Vyshniak (val@val.one)
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+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;
+
+import java.nio.ByteOrder;
+
+public class Tk103FrameDecoder extends FrameDecoder {
+
+    @Override
+    protected Object decode(
+            ChannelHandlerContext ctx,
+            Channel channel,
+            ChannelBuffer buf) throws Exception {
+
+        if (buf.readableBytes() < 2) {
+            return null;
+        }
+
+        int index;
+        for (index = buf.readerIndex(); true; index++) {
+            index = buf.indexOf(index, buf.writerIndex(), (byte) ')');
+            if (index == -1) {
+                break;
+            }
+            int cnt = 0;
+            for (int i = buf.readerIndex(); i < index; i++) {
+                if (buf.getByte(i) == (byte) '$') {
+                    cnt++;
+                }
+            }
+            if (cnt % 2 == 0) {
+                break;
+            }
+        }
+
+        if (index != -1) {
+            ChannelBuffer result = ChannelBuffers.buffer(ByteOrder.LITTLE_ENDIAN, index + 1 - buf.readerIndex());
+            buf.readBytes(result, index + 1 - buf.readerIndex());
+            result.writerIndex(result.writerIndex() - 1);
+            return result;
+        }
+
+        return null;
+    }
+
+}
-- 
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