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authorAnton Tananaev <anton.tananaev@gmail.com>2017-05-26 06:34:39 +1200
committerAnton Tananaev <anton.tananaev@gmail.com>2017-05-26 06:34:39 +1200
commitf8ad64b0dc20c3612bf76ad029d852fc390ceb2f (patch)
tree9ed6fb19017ddd2bab9fab710fc0e0430b44425b /src/org/traccar/protocol/Gps056FrameDecoder.java
parent2858f2b852c39c9517a4b353d2ed4bff6bccc627 (diff)
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Implement GPS056 protocol
Diffstat (limited to 'src/org/traccar/protocol/Gps056FrameDecoder.java')
-rw-r--r--src/org/traccar/protocol/Gps056FrameDecoder.java43
1 files changed, 43 insertions, 0 deletions
diff --git a/src/org/traccar/protocol/Gps056FrameDecoder.java b/src/org/traccar/protocol/Gps056FrameDecoder.java
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+++ b/src/org/traccar/protocol/Gps056FrameDecoder.java
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+/*
+ * 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.channel.Channel;
+import org.jboss.netty.channel.ChannelHandlerContext;
+import org.jboss.netty.handler.codec.frame.FrameDecoder;
+
+import java.nio.charset.StandardCharsets;
+
+public class Gps056FrameDecoder extends FrameDecoder {
+
+ private static final int MESSAGE_HEADER = 4;
+
+ @Override
+ protected Object decode(
+ ChannelHandlerContext ctx, Channel channel, ChannelBuffer buf) throws Exception {
+
+ if (buf.readableBytes() >= MESSAGE_HEADER) {
+ int length = Integer.parseInt(buf.toString(2, 2, StandardCharsets.US_ASCII)) + 5;
+ if (buf.readableBytes() >= length) {
+ return buf.readBytes(length);
+ }
+ }
+
+ return null;
+ }
+
+}