From f8ad64b0dc20c3612bf76ad029d852fc390ceb2f Mon Sep 17 00:00:00 2001 From: Anton Tananaev Date: Fri, 26 May 2017 06:34:39 +1200 Subject: Implement GPS056 protocol --- src/org/traccar/protocol/Gps056FrameDecoder.java | 43 ++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 src/org/traccar/protocol/Gps056FrameDecoder.java (limited to 'src/org/traccar/protocol/Gps056FrameDecoder.java') diff --git a/src/org/traccar/protocol/Gps056FrameDecoder.java b/src/org/traccar/protocol/Gps056FrameDecoder.java new file mode 100644 index 000000000..7adfddd07 --- /dev/null +++ b/src/org/traccar/protocol/Gps056FrameDecoder.java @@ -0,0 +1,43 @@ +/* + * 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; + } + +} -- cgit v1.2.3