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
170
171
172
173
|
/*
* Copyright 2021 - 2023 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.session.DeviceSession;
import org.traccar.NetworkMessage;
import org.traccar.Protocol;
import org.traccar.helper.BitUtil;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
public class DualcamProtocolDecoder extends BaseProtocolDecoder {
public DualcamProtocolDecoder(Protocol protocol) {
super(protocol);
}
public static final int MSG_INIT = 0;
public static final int MSG_START = 1;
public static final int MSG_RESUME = 2;
public static final int MSG_SYNC = 3;
public static final int MSG_DATA = 4;
public static final int MSG_COMPLETE = 5;
public static final int MSG_FILE_REQUEST = 8;
public static final int MSG_INIT_REQUEST = 9;
public static final int MSG_PATH_REQUEST = 0x000C;
public static final int MSG_PATH_RESPONSE = 0x000D;
private String model;
private String uniqueId;
private int dataSize;
private int dataCurrent;
private boolean video;
private ByteBuf media;
private boolean isPacketData() {
if (model == null) {
return dataSize < 8192;
} else {
return !"DSM".equals(model);
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
int type = buf.readUnsignedShort();
DeviceSession deviceSession;
switch (type) {
case MSG_INIT:
buf.readUnsignedShort(); // protocol id
uniqueId = String.valueOf(buf.readLong());
deviceSession = getDeviceSession(channel, remoteAddress, uniqueId);
long settings = buf.readUnsignedInt();
if (channel != null && deviceSession != null) {
model = getDeviceModel(deviceSession);
ByteBuf response = Unpooled.buffer();
if (BitUtil.check(settings, 25)) {
response.writeShort(MSG_PATH_REQUEST);
response.writeShort(2);
response.writeShort(0);
} else if (BitUtil.between(settings, 26, 30) > 0) {
response.writeShort(MSG_FILE_REQUEST);
String file;
if (BitUtil.check(settings, 26)) {
video = false;
file = "%photof";
} else if (BitUtil.check(settings, 27)) {
video = false;
file = "%photor";
} else if (BitUtil.check(settings, 28)) {
video = true;
file = "%videof";
} else {
video = true;
file = "%videor";
}
response.writeShort(file.length());
response.writeCharSequence(file, StandardCharsets.US_ASCII);
} else {
response.writeShort(MSG_INIT);
}
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
break;
case MSG_START:
buf.readUnsignedShort(); // length
dataSize = buf.readInt();
dataCurrent = isPacketData() ? 1 : 0;
media = Unpooled.buffer();
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeShort(MSG_RESUME);
response.writeShort(4);
response.writeInt(dataCurrent);
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
break;
case MSG_DATA:
int length = buf.readUnsignedShort() - 2;
media.writeBytes(buf, length);
boolean finished;
if (isPacketData()) {
finished = dataCurrent == dataSize;
dataCurrent += 1;
} else {
finished = dataCurrent + length == dataSize;
dataCurrent += length;
}
if (finished) {
deviceSession = getDeviceSession(channel, remoteAddress);
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
getLastLocation(position, null);
try {
if (video) {
position.set(Position.KEY_VIDEO, writeMediaFile(uniqueId, media, "h265"));
} else {
position.set(Position.KEY_IMAGE, writeMediaFile(uniqueId, media, "jpg"));
}
} finally {
media.release();
media = null;
}
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeShort(MSG_INIT_REQUEST);
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
return position;
}
break;
case MSG_PATH_RESPONSE:
String file = buf.readCharSequence(buf.readUnsignedShort(), StandardCharsets.US_ASCII).toString();
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeShort(MSG_FILE_REQUEST);
response.writeShort(file.length());
response.writeCharSequence(file, StandardCharsets.US_ASCII);
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
break;
default:
break;
}
return null;
}
}
|
