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authorAnton Tananaev <anton.tananaev@gmail.com>2017-06-17 17:49:57 +1200
committerAnton Tananaev <anton.tananaev@gmail.com>2017-06-17 17:49:57 +1200
commita16e97566a2950d6f5fd98fc2d66d93636f483e0 (patch)
treeb1e4ed03cc2091aa0ce40dbf96fe11511380a49e /src/org/traccar/protocol/Vt200FrameDecoder.java
parent6ac6d713d1ad34c1e13fae65bf79546961ee3574 (diff)
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VT200 custom frame decoder
Diffstat (limited to 'src/org/traccar/protocol/Vt200FrameDecoder.java')
-rw-r--r--src/org/traccar/protocol/Vt200FrameDecoder.java51
1 files changed, 51 insertions, 0 deletions
diff --git a/src/org/traccar/protocol/Vt200FrameDecoder.java b/src/org/traccar/protocol/Vt200FrameDecoder.java
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+++ 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;
+ }
+
+}