aboutsummaryrefslogtreecommitdiff
path: root/src/org/traccar/protocol/GalileoProtocolDecoder.java
blob: e4b80777e2e8ec5f4da37925c593603a0d1afe8c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
/*
 * Copyright 2013 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 java.nio.ByteOrder;
import java.nio.charset.Charset;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.TimeZone;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.traccar.BaseProtocolDecoder;
import org.traccar.ServerManager;
import org.traccar.helper.Log;
import org.traccar.model.Position;

public class GalileoProtocolDecoder extends BaseProtocolDecoder {

    public GalileoProtocolDecoder(ServerManager serverManager) {
        super(serverManager);
    }
    
    private static final Map<Integer, Integer> tagLengthMap = new HashMap<Integer, Integer>();
    
    static {
        int[] l1 = {0x01,0x02,0x35,0x43,0xc4,0xc5,0xc6,0xc7,0xc8,0xc9,0xca,0xcb,0xcc,0xcd,0xce,0xcf,0xd0,0xd1,0xd2,0xd5};
        int[] l2 = {0x04,0x10,0x34,0x40,0x41,0x42,0x45,0x46,0x50,0x51,0x52,0x53,0x58,0x59,0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0xd6,0xd7,0xd8,0xd9,0xda};
        int[] l4 = {0x20,0x33,0x44,0x90,0xc0,0xc1,0xc2,0xc3,0xd3,0xd4,0xdb,0xdc,0xdd,0xde,0xdf};
        for (int i : l1) { tagLengthMap.put(i, 1); }
        for (int i : l2) { tagLengthMap.put(i, 2); }
        for (int i : l4) { tagLengthMap.put(i, 4); }
    }

    private static int getTagLength(int tag) {
        return tagLengthMap.get(tag);
    }

    private String readImei(ChannelBuffer buf) {
        int b = buf.readUnsignedByte();
        StringBuilder imei = new StringBuilder();
        imei.append(b & 0x0F);
        for (int i = 0; i < 7; i++) {
            b = buf.readUnsignedByte();
            imei.append((b & 0xF0) >> 4);
            imei.append(b & 0x0F);
        }
        return imei.toString();
    }

    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_MILAGE = 0xd4;

    
    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(
            ChannelHandlerContext ctx, Channel channel, Object msg)
            throws Exception {

        ChannelBuffer buf = (ChannelBuffer) msg;
        
        buf.readUnsignedByte(); // header
        int length = buf.readUnsignedShort() & 0x7fff + 3;
        
        // Create new position
        Position position = new Position();
        StringBuilder extendedInfo = new StringBuilder("<protocol>galileo</protocol>");
        
        while (buf.readerIndex() < length) {
            int tag = buf.readUnsignedByte();
            switch (tag) {

                case TAG_IMEI:
                    String imei = buf.toString(buf.readerIndex(), 15, Charset.defaultCharset());
                    buf.skipBytes(imei.length());
                    try {
                        position.setDeviceId(getDataManager().getDeviceByImei(imei).getId());
                    } catch(Exception error) {
                        Log.warning("Unknown device - " + imei);
                    }
                    break;

                case TAG_DATE:
                    position.setTime(new Date(buf.readUnsignedInt() * 1000));
                    break;
                    
                case TAG_COORDINATES:
                    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((double) buf.readShort());
                    break;
                    
                case TAG_STATUS:
                    extendedInfo.append("<status>");
                    extendedInfo.append(buf.readUnsignedShort());
                    extendedInfo.append("</status>");
                    break;
                    
                case TAG_POWER:
                    position.setPower((double) buf.readUnsignedShort());
                    break;
                    
                case TAG_BATTERY:
                    extendedInfo.append("<battery>");
                    extendedInfo.append(buf.readUnsignedShort());
                    extendedInfo.append("</battery>");
                    break;
                    
                case TAG_MILAGE:
                    extendedInfo.append("<milage>");
                    extendedInfo.append(buf.readUnsignedInt());
                    extendedInfo.append("</milage>");
                    break;
                    
                default:
                    buf.skipBytes(getTagLength(tag));
                    break;
                    
            }
        }
        
        sendReply(channel, buf.readUnsignedShort());
        
        position.setExtendedInfo(extendedInfo.toString());
        return position;
    }

}