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/*
* Copyright 2013 - 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.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
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 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,
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, 0xc2, 0xc3, 0xd3,
0xd4, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 0xf0, 0xf9,
0x5a, 0x47, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6,
0xf7, 0xf8, 0xe2, 0xe9
};
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(0x5b, 7); // variable length
TAG_LENGTH_MAP.put(0x5c, 68);
}
private static int getTagLength(int tag) {
Integer length = TAG_LENGTH_MAP.get(tag);
if (length == null) {
throw new IllegalArgumentException("Unknown tag: " + tag);
}
return length;
}
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);
}
}
private void decodeTag(Position position, ChannelBuffer buf, int tag) {
switch (tag) {
case 0x01:
position.set(Position.KEY_VERSION_HW, buf.readUnsignedByte());
break;
case 0x02:
position.set(Position.KEY_VERSION_FW, buf.readUnsignedByte());
break;
case 0x04:
position.set("deviceId", buf.readUnsignedShort());
break;
case 0x10:
position.set(Position.KEY_INDEX, buf.readUnsignedShort());
break;
case 0x20:
position.setTime(new Date(buf.readUnsignedInt() * 1000));
break;
case 0x33:
position.setSpeed(buf.readUnsignedShort() * 0.0539957);
position.setCourse(buf.readUnsignedShort() * 0.1);
break;
case 0x34:
position.setAltitude(buf.readShort());
break;
case 0x40:
position.set(Position.KEY_STATUS, buf.readUnsignedShort());
break;
case 0x41:
position.set(Position.KEY_POWER, buf.readUnsignedShort());
break;
case 0x42:
position.set(Position.KEY_BATTERY, buf.readUnsignedShort());
break;
case 0x43:
position.set(Position.KEY_DEVICE_TEMP, buf.readByte());
break;
case 0x44:
position.set(Position.KEY_ACCELERATION, buf.readUnsignedInt());
break;
case 0x45:
position.set(Position.KEY_OUTPUT, buf.readUnsignedShort());
break;
case 0x46:
position.set(Position.KEY_INPUT, buf.readUnsignedShort());
break;
case 0x50:
case 0x51:
case 0x52:
case 0x53:
case 0x54:
case 0x55:
case 0x56:
case 0x57:
position.set(Position.PREFIX_ADC + (tag - 0x50), buf.readUnsignedShort());
break;
case 0x58:
position.set("rs2320", buf.readUnsignedShort());
break;
case 0x59:
position.set("rs2321", buf.readUnsignedShort());
break;
case 0xc0:
position.set("fuelTotal", buf.readUnsignedInt() * 0.5);
break;
case 0xc1:
position.set(Position.KEY_FUEL_LEVEL, buf.readUnsignedByte() * 0.4);
position.set(Position.PREFIX_TEMP + 1, buf.readUnsignedByte() - 40);
position.set(Position.KEY_RPM, buf.readUnsignedShort() * 0.125);
break;
case 0xc2:
position.set("canB0", buf.readUnsignedInt());
break;
case 0xc3:
position.set("canB1", buf.readUnsignedInt());
break;
case 0xc4:
case 0xc5:
case 0xc6:
case 0xc7:
case 0xc8:
case 0xc9:
case 0xca:
case 0xcb:
case 0xcc:
case 0xcd:
case 0xce:
case 0xcf:
case 0xd0:
case 0xd1:
case 0xd2:
position.set("can8Bit" + (tag - 0xc4), buf.readUnsignedByte());
break;
case 0xd6:
case 0xd7:
case 0xd8:
case 0xd9:
case 0xda:
position.set("can16Bit" + (tag - 0xd6), buf.readUnsignedShort());
break;
case 0xdb:
case 0xdc:
case 0xdd:
case 0xde:
case 0xdf:
position.set("can32Bit" + (tag - 0xdb), buf.readUnsignedInt());
break;
case 0xd4:
position.set(Position.KEY_ODOMETER, buf.readUnsignedInt());
break;
case 0xe2:
case 0xe3:
case 0xe4:
case 0xe5:
case 0xe6:
case 0xe7:
case 0xe8:
case 0xe9:
position.set("userData" + (tag - 0xe2), buf.readUnsignedInt());
break;
case 0xea:
position.set("userDataArray", ChannelBuffers.hexDump(buf.readBytes(buf.readUnsignedByte())));
break;
default:
buf.skipBytes(getTagLength(tag));
break;
}
}
@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;
DeviceSession deviceSession = null;
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);
if (tag == 0x03) {
deviceSession = getDeviceSession(
channel, remoteAddress, buf.readBytes(15).toString(StandardCharsets.US_ASCII));
} else if (tag == 0x30) {
hasLocation = true;
position.setValid((buf.readUnsignedByte() & 0xf0) == 0x00);
position.setLatitude(buf.readInt() / 1000000.0);
position.setLongitude(buf.readInt() / 1000000.0);
} else {
decodeTag(position, buf, tag);
}
}
if (hasLocation && position.getFixTime() != null) {
positions.add(position);
}
if (deviceSession == null) {
deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
}
sendReply(channel, buf.readUnsignedShort());
for (Position p : positions) {
p.setProtocol(getProtocolName());
p.setDeviceId(deviceSession.getDeviceId());
}
return positions.isEmpty() ? null : positions;
}
}
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