blob: 992cb02ab01182c3c5fb4f89c5e11f0f63a386cd (
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
|
/*
* Copyright 2017 - 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 io.netty.channel.ChannelHandlerContext;
import org.traccar.BaseFrameDecoder;
public class WatchFrameDecoder extends BaseFrameDecoder {
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
int brackets = 0;
int endIndex = -1;
for (int i = buf.readerIndex(); i < buf.writerIndex(); i++) {
byte b = buf.getByte(i);
switch (b) {
case '[' -> brackets += 1;
case ']' -> brackets -= 1;
}
if (brackets == 0 && i > buf.readerIndex()) {
endIndex = i + 1;
break;
}
}
if (endIndex > 0) {
ByteBuf frame = Unpooled.buffer();
while (buf.readerIndex() < endIndex) {
byte b1 = buf.readByte();
if (b1 == '}') {
byte b2 = buf.readByte();
switch (b2) {
case 0x01 -> frame.writeByte('}');
case 0x02 -> frame.writeByte('[');
case 0x03 -> frame.writeByte(']');
case 0x04 -> frame.writeByte(',');
case 0x05 -> frame.writeByte('*');
default -> throw new IllegalArgumentException(
String.format("unexpected byte at %d: 0x%02x", buf.readerIndex() - 1, b2));
}
} else {
frame.writeByte(b1);
}
}
return frame;
}
return null;
}
}
|
