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authorAnton Tananaev <anton.tananaev@gmail.com>2016-07-06 16:31:44 +1200
committerAnton Tananaev <anton.tananaev@gmail.com>2016-07-06 16:31:44 +1200
commit2f27e1e7af87191ae242732119073148561658cd (patch)
tree6acd88e034f0e2e92883929f0a1c710482657e76 /src/org/traccar/protocol/L100FrameDecoder.java
parent4ff6bf486ae2026b8943ec11b848a993b9067db2 (diff)
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Implement ATL L100 protocol for VTS
Diffstat (limited to 'src/org/traccar/protocol/L100FrameDecoder.java')
-rw-r--r--src/org/traccar/protocol/L100FrameDecoder.java50
1 files changed, 50 insertions, 0 deletions
diff --git a/src/org/traccar/protocol/L100FrameDecoder.java b/src/org/traccar/protocol/L100FrameDecoder.java
new file mode 100644
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+++ b/src/org/traccar/protocol/L100FrameDecoder.java
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+/*
+ * Copyright 2016 Anton Tananaev (anton.tananaev@gmail.com)
+ *
+ * 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.channel.Channel;
+import org.jboss.netty.channel.ChannelHandlerContext;
+import org.jboss.netty.handler.codec.frame.FrameDecoder;
+
+public class L100FrameDecoder extends FrameDecoder {
+
+ @Override
+ protected Object decode(
+ ChannelHandlerContext ctx, Channel channel, ChannelBuffer buf) throws Exception {
+
+ if (buf.readableBytes() < 80) {
+ return null;
+ }
+
+ int index = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) 0x02);
+ if (index == -1) {
+ index = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) 0x04);
+ if (index == -1) {
+ return null;
+ }
+ }
+
+ index += 2; // checksum
+
+ if (buf.readableBytes() >= index - buf.readerIndex()) {
+ return buf.readBytes(index - buf.readerIndex());
+ }
+
+ return null;
+ }
+
+}