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/*
* Copyright 2013 - 2015 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.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.helper.Log;
import org.traccar.model.Event;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.ByteOrder;
import java.nio.charset.StandardCharsets;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
public class GalileoProtocolDecoder extends BaseProtocolDecoder {
public GalileoProtocolDecoder(GalileoProtocol protocol) {
super(protocol);
}
private static final int TAG_IMEI = 0x03;
private static final int TAG_DATE = 0x20;
private static final int TAG_COORDINATES = 0x30;
private static final int TAG_SPEED_COURSE = 0x33;
private static final int TAG_ALTITUDE = 0x34;
private static final int TAG_STATUS = 0x40;
private static final int TAG_POWER = 0x41;
private static final int TAG_BATTERY = 0x42;
private static final int TAG_ODOMETER = 0xd4;
private static final int TAG_REFRIGERATOR = 0x5b;
private static final int TAG_PRESSURE = 0x5c;
private static final Map<Integer, Integer> TAG_LENGTH_MAP = new HashMap<>();
static {
int[] l1 = {
0x01, 0x02, 0x35, 0x43, 0xc4, 0xc5, 0xc6, 0xc7,
0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
0xd0, 0xd1, 0xd2, 0xd5, 0x88, 0x8a, 0x8b, 0x8c,
0xa0, 0xaf, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6,
0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae
};
int[] l2 = {
0x04, 0x10, 0x34, 0x40, 0x41, 0x42, 0x45, 0x46,
0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
0x58, 0x59, 0x60, 0x61, 0x62, 0x70, 0x71, 0x72,
0x73, 0x74, 0x75, 0x76, 0x77, 0xb0, 0xb1, 0xb2,
0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xd6,
0xd7, 0xd8, 0xd9, 0xda
};
int[] l3 = {
0x63, 0x64, 0x6f, 0x5d, 0x65, 0x66, 0x67, 0x68,
0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e
};
int[] l4 = {
0x20, 0x33, 0x44, 0x90, 0xc0, 0xc1, 0xc2, 0xc3,
0xd3, 0xd4, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 0xf0,
0xf9, 0x5a, 0x47, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5,
0xf6, 0xf7, 0xf8
};
for (int i : l1) {
TAG_LENGTH_MAP.put(i, 1);
}
for (int i : l2) {
TAG_LENGTH_MAP.put(i, 2);
}
for (int i : l3) {
TAG_LENGTH_MAP.put(i, 3);
}
for (int i : l4) {
TAG_LENGTH_MAP.put(i, 4);
}
TAG_LENGTH_MAP.put(TAG_COORDINATES, 9);
TAG_LENGTH_MAP.put(TAG_IMEI, 15);
TAG_LENGTH_MAP.put(TAG_REFRIGERATOR, 7); // variable length
TAG_LENGTH_MAP.put(TAG_PRESSURE, 68);
}
private static int getTagLength(int tag) {
return TAG_LENGTH_MAP.get(tag);
}
private void sendReply(Channel channel, int checksum) {
ChannelBuffer reply = ChannelBuffers.directBuffer(ByteOrder.LITTLE_ENDIAN, 3);
reply.writeByte(0x02);
reply.writeShort((short) checksum);
if (channel != null) {
channel.write(reply);
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
buf.readUnsignedByte(); // header
int length = (buf.readUnsignedShort() & 0x7fff) + 3;
List<Position> positions = new LinkedList<>();
Set<Integer> tags = new HashSet<>();
boolean hasLocation = false;
Position position = new Position();
while (buf.readerIndex() < length) {
// Check if new message started
int tag = buf.readUnsignedByte();
if (tags.contains(tag)) {
if (hasLocation && position.getFixTime() != null) {
positions.add(position);
}
tags.clear();
hasLocation = false;
position = new Position();
}
tags.add(tag);
switch (tag) {
case TAG_IMEI:
String imei = buf.toString(buf.readerIndex(), 15, StandardCharsets.US_ASCII);
buf.skipBytes(imei.length());
identify(imei, channel, remoteAddress);
break;
case TAG_DATE:
position.setTime(new Date(buf.readUnsignedInt() * 1000));
break;
case TAG_COORDINATES:
hasLocation = true;
position.setValid((buf.readUnsignedByte() & 0xf0) == 0x00);
position.setLatitude(buf.readInt() / 1000000.0);
position.setLongitude(buf.readInt() / 1000000.0);
break;
case TAG_SPEED_COURSE:
position.setSpeed(buf.readUnsignedShort() * 0.0539957);
position.setCourse(buf.readUnsignedShort() * 0.1);
break;
case TAG_ALTITUDE:
position.setAltitude(buf.readShort());
break;
case TAG_STATUS:
position.set(Event.KEY_STATUS, buf.readUnsignedShort());
break;
case TAG_POWER:
position.set(Event.KEY_POWER, buf.readUnsignedShort());
break;
case TAG_BATTERY:
position.set(Event.KEY_BATTERY, buf.readUnsignedShort());
break;
case TAG_ODOMETER:
position.set(Event.KEY_ODOMETER, buf.readUnsignedInt());
break;
default:
buf.skipBytes(getTagLength(tag));
break;
}
}
if (hasLocation && position.getFixTime() != null) {
positions.add(position);
}
if (!hasDeviceId()) {
Log.warning("Unknown device");
return null;
}
sendReply(channel, buf.readUnsignedShort());
for (Position p : positions) {
p.setProtocol(getProtocolName());
p.setDeviceId(getDeviceId());
}
if (positions.isEmpty()) {
return null;
}
return positions;
}
}
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