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/*
* Copyright 2012 - 2018 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.traccar.BaseFrameDecoder;
import org.traccar.helper.BufferUtil;
import io.netty.buffer.ByteBuf;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
public class XexunFrameDecoder extends BaseFrameDecoder {
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
if (buf.readableBytes() < 80) {
return null;
}
int beginIndex = BufferUtil.indexOf("GPRMC", buf);
if (beginIndex == -1) {
beginIndex = BufferUtil.indexOf("GNRMC", buf);
if (beginIndex == -1) {
return null;
}
}
int identifierIndex = BufferUtil.indexOf("imei:", buf, beginIndex, buf.writerIndex());
if (identifierIndex == -1) {
return null;
}
int endIndex = buf.indexOf(identifierIndex, buf.writerIndex(), (byte) ',');
if (endIndex == -1) {
return null;
}
buf.skipBytes(beginIndex - buf.readerIndex());
return buf.readRetainedSlice(endIndex - beginIndex + 1);
}
}
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