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/*
* Copyright 2019 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 io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufUtil;
import io.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.Protocol;
import org.traccar.helper.BitUtil;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
public class PacificTrackProtocolDecoder extends BaseProtocolDecoder {
public PacificTrackProtocolDecoder(Protocol protocol) {
super(protocol);
}
public static int readBitExt(ByteBuf buf) {
int result = 0;
while (buf.isReadable()) {
int b = buf.readUnsignedByte();
result <<= 7;
result += BitUtil.to(b, 7);
if (BitUtil.check(b, 7)) {
break;
}
}
return result;
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.readByte(); // frame start
readBitExt(buf); // frame control
readBitExt(buf); // frame length
DeviceSession deviceSession = null;
Position position = new Position(getProtocolName());
while (buf.isReadable()) {
int segmentId = readBitExt(buf);
int segmentLength = readBitExt(buf);
switch (segmentId) {
case 0x01:
position.set(Position.KEY_EVENT, readBitExt(buf));
break;
case 0x10:
position.setValid(BitUtil.check(buf.readUnsignedByte(), 4));
int date = buf.readUnsignedByte();
DateBuilder dateBuilder = new DateBuilder()
.setDate(2010 + BitUtil.from(date, 4), BitUtil.to(date, 4), buf.readUnsignedByte())
.setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
position.setTime(dateBuilder.getDate());
position.setLatitude(buf.readUnsignedInt() / 1000000.0 - 90.0);
position.setLongitude(buf.readUnsignedInt() / 1000000.0 - 180.0);
int speedAndCourse = buf.readUnsignedMedium();
position.setCourse(BitUtil.from(speedAndCourse, 12));
position.setSpeed(UnitsConverter.knotsFromKph(BitUtil.to(speedAndCourse, 12) * 0.1));
position.set(Position.KEY_INDEX, buf.readUnsignedShort());
break;
case 0x100:
String imei = ByteBufUtil.hexDump(buf.readSlice(8)).substring(0, 15);
deviceSession = getDeviceSession(channel, remoteAddress, imei);
break;
default:
buf.skipBytes(segmentLength);
break;
}
}
if (deviceSession != null) {
position.setDeviceId(deviceSession.getDeviceId());
return position;
} else {
return null;
}
}
}
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