From a16e97566a2950d6f5fd98fc2d66d93636f483e0 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Sat, 17 Jun 2017 17:49:57 +1200
Subject: VT200 custom frame decoder

---
 src/org/traccar/protocol/Vt200FrameDecoder.java | 51 +++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 src/org/traccar/protocol/Vt200FrameDecoder.java

(limited to 'src/org/traccar/protocol/Vt200FrameDecoder.java')

diff --git a/src/org/traccar/protocol/Vt200FrameDecoder.java b/src/org/traccar/protocol/Vt200FrameDecoder.java
new file mode 100644
index 000000000..adde12118
--- /dev/null
+++ b/src/org/traccar/protocol/Vt200FrameDecoder.java
@@ -0,0 +1,51 @@
+/*
+ * 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;
+
+public class Vt200FrameDecoder extends FrameDecoder {
+
+    @Override
+    protected Object decode(
+            ChannelHandlerContext ctx, Channel channel, ChannelBuffer buf) throws Exception {
+
+        int endIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) ')') + 1;
+        if (endIndex > 0) {
+
+            ChannelBuffer frame = ChannelBuffers.dynamicBuffer();
+
+            while (buf.readerIndex() < endIndex) {
+                int b = buf.readByte();
+                if (b == '=') {
+                    frame.writeByte(buf.readByte() ^ '=');
+                } else {
+                    frame.writeByte(b);
+                }
+            }
+
+            return frame;
+
+        }
+
+        return null;
+    }
+
+}
-- 
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