blob: 52d43c36c00644043d2cc961307ea8bc76bc7ef3 (
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
|
/*
* Copyright 2022 Stefan Clark (stefan@stefanclark.co.uk)
*
* 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.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToByteEncoder;
public class Xexun2FrameEncoder extends MessageToByteEncoder<ByteBuf> {
@Override
protected void encode(ChannelHandlerContext ctx, ByteBuf msg, ByteBuf out) {
out.writeBytes(msg.readBytes(2));
while (msg.readableBytes() > 2) {
int b = msg.readUnsignedByte();
if (b == 0xfa && msg.isReadable() && msg.getUnsignedByte(msg.readerIndex()) == 0xaf) {
msg.readUnsignedByte();
out.writeByte(0xfb);
out.writeByte(0xbf);
out.writeByte(0x01);
} else if (b == 0xfb && msg.isReadable() && msg.getUnsignedByte(msg.readerIndex()) == 0xbf) {
msg.readUnsignedByte();
out.writeByte(0xfb);
out.writeByte(0xbf);
out.writeByte(0x02);
} else {
out.writeByte(b);
}
}
out.writeBytes(msg.readBytes(2));
}
}
|
