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authorAnton Tananaev <anton.tananaev@gmail.com>2014-04-14 23:35:55 +1200
committerAnton Tananaev <anton.tananaev@gmail.com>2014-04-14 23:35:55 +1200
commit771866c000cbe17fc90590479186f73e1edbd493 (patch)
tree03bc33c65d647a4f49d5eb4eca31c985d8338140 /src/org/traccar/protocol
parentd998f74d1153630090b173d4d74cd9f776ccd95d (diff)
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Add GT06 frame decoder (fix #655)
Diffstat (limited to 'src/org/traccar/protocol')
-rw-r--r--src/org/traccar/protocol/Gt06FrameDecoder.java52
1 files changed, 52 insertions, 0 deletions
diff --git a/src/org/traccar/protocol/Gt06FrameDecoder.java b/src/org/traccar/protocol/Gt06FrameDecoder.java
new file mode 100644
index 000000000..bf487dc85
--- /dev/null
+++ b/src/org/traccar/protocol/Gt06FrameDecoder.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2014 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 Gt06FrameDecoder extends FrameDecoder {
+
+ @Override
+ protected Object decode(
+ ChannelHandlerContext ctx,
+ Channel channel,
+ ChannelBuffer buf) throws Exception {
+
+ // Check minimum length
+ if (buf.readableBytes() < 5) {
+ return null;
+ }
+
+ int length = 2 + 2; // head and tail
+
+ if (buf.getByte(buf.readerIndex()) == 0x78) {
+ length += 1 + buf.getByte(buf.readerIndex() + 2);
+ } else {
+ length += 2 + buf.getShort(buf.readerIndex() + 2);
+ }
+
+ // Check length and return buffer
+ if (buf.readableBytes() >= length) {
+ return buf.readBytes(length);
+ }
+
+ return null;
+ }
+
+}