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/*
* Copyright 2024 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.Unpooled;
import io.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.NetworkMessage;
import org.traccar.Protocol;
import org.traccar.helper.BitUtil;
import org.traccar.helper.Checksum;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import org.traccar.session.DeviceSession;
import java.net.SocketAddress;
import java.util.Date;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
public class FleetGuideProtocolDecoder extends BaseProtocolDecoder {
public FleetGuideProtocolDecoder(Protocol protocol) {
super(protocol);
}
public static final int MSG_EMPTY = 0;
public static final int MSG_SYNC_REQ = 1;
public static final int MSG_SYNC_ACK = 2;
public static final int MSG_DATA_R_ACK = 3;
public static final int MSG_DATA_N_ACK = 4;
public static final int MSG_REP_R_ACK = 5;
public static final int MSG_REP_N_ACK = 6;
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.readUnsignedByte(); // signature
int options = buf.readUnsignedShortLE();
int length = BitUtil.to(options, 11);
DeviceSession deviceSession;
Long deviceId;
if (BitUtil.check(options, 11)) {
deviceId = buf.readUnsignedIntLE();
deviceSession = getDeviceSession(channel, remoteAddress, String.valueOf(deviceId));
} else {
deviceId = null;
deviceSession = getDeviceSession(channel, remoteAddress);
}
if (deviceSession == null) {
return null;
}
int type;
Integer index;
if (BitUtil.check(options, 12)) {
int value = buf.readUnsignedByte();
type = BitUtil.to(value, 4);
index = BitUtil.from(value, 4);
} else {
type = 0;
index = null;
}
if (type != MSG_DATA_N_ACK && type != MSG_REP_N_ACK) {
Integer responseType;
if (type == MSG_SYNC_REQ) {
responseType = MSG_SYNC_ACK;
} else {
responseType = null;
}
sendResponse(channel, remoteAddress, deviceId, responseType, index);
}
if (BitUtil.check(options, 13)) {
buf.readUnsignedShortLE(); // acknowledgement
}
ByteBuf data;
if (BitUtil.check(options, 14)) {
data = decompress(buf.readSlice(length));
} else {
data = buf.readRetainedSlice(length);
}
List<Position> positions = new LinkedList<>();
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
Set<Integer> recordTypes = new HashSet<>();
while (data.isReadable()) {
int recordHeader = data.readUnsignedShortLE();
int recordLength = BitUtil.to(recordHeader, 10);
int recordType = BitUtil.from(recordHeader, 10);
int recordEndIndex = data.readerIndex() + recordLength;
if (recordTypes.contains(recordType)) {
processPosition(positions, position);
position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
recordTypes.clear();
}
recordTypes.add(recordType);
switch (recordType) {
case 0:
position.setTime(new Date((data.readUnsignedIntLE() + 1262304000) * 1000)); // since 2010-01-01
break;
case 1:
position.setLatitude(data.readUnsignedIntLE() * 90.0 / 0xFFFFFFFFL);
position.setLongitude(data.readUnsignedIntLE() * 180.0 / 0xFFFFFFFFL);
int speed = data.readUnsignedShortLE();
position.setSpeed(UnitsConverter.knotsFromKph(BitUtil.to(speed, 14) * 0.1));
if (BitUtil.check(speed, 14)) {
position.setLatitude(-position.getLatitude());
}
if (BitUtil.check(speed, 15)) {
position.setLongitude(-position.getLongitude());
}
int course = data.readUnsignedShortLE();
position.setSpeed(BitUtil.to(course, 9));
int motion = BitUtil.between(course, 9, 11);
if (motion > 0) {
position.set(Position.KEY_MOTION, motion == 1);
}
position.set(Position.KEY_SATELLITES, BitUtil.from(course, 11));
int altitude = data.readUnsignedShortLE();
position.setAltitude(BitUtil.to(altitude, 14));
if (BitUtil.check(altitude, 14)) {
position.setAltitude(-position.getAltitude());
}
break;
default:
break;
}
data.readerIndex(recordEndIndex);
}
processPosition(positions, position);
data.release();
return positions.isEmpty() ? null : positions;
}
private void processPosition(List<Position> positions, Position position) {
if (!position.getAttributes().isEmpty()) {
if (position.getFixTime() == null) {
position.setTime(new Date());
}
if (!position.getAttributes().containsKey(Position.KEY_SATELLITES)) {
getLastLocation(position, null);
}
positions.add(position);
}
}
private void sendResponse(
Channel channel, SocketAddress remoteAddress, Long deviceId, Integer type, Integer index) {
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeByte(0x53); // signature
int options = 0;
if (deviceId != null) {
options |= 1 << 11;
}
if (type != null) {
options |= 1 << 12;
}
if (index != null) {
options |= 1 << 13;
}
response.writeShortLE(options);
if (deviceId != null) {
response.writeIntLE(deviceId.intValue());
}
if (type != null) {
response.writeByte(type);
}
if (index != null) {
int mask = (1 << (index + 1)) - 1;
response.writeShortLE(mask);
}
response.writeShortLE(Checksum.crc16(
Checksum.CRC16_CCITT_FALSE, response.nioBuffer(1, response.writerIndex() - 1)));
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
}
private int readVarSize(ByteBuf buf) {
int b;
int y = 0;
do {
b = buf.readUnsignedByte();
y = (y << 7) | (b & 0x0000007f);
} while ((b & 0x00000080) > 0);
return y;
}
private ByteBuf decompress(ByteBuf in) {
ByteBuf out = Unpooled.buffer();
if (in.readableBytes() < 1) {
return out;
}
int marker = in.readUnsignedByte();
do {
int symbol = in.readUnsignedByte();
if (symbol == marker) {
if (in.getUnsignedByte(in.readerIndex()) == 0) {
out.writeByte(marker);
in.skipBytes(1);
} else {
int length = readVarSize(in);
int offset = readVarSize(in);
for (int i = 0; i < length; i++) {
out.writeByte(out.getUnsignedByte(out.writerIndex() - offset));
}
}
} else {
out.writeByte(symbol);
}
} while (in.isReadable());
return out;
}
}
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