blob: c30fee6e38b9162011ec814ed12a68add67d96a2 (
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
|
/*
* Copyright 2013 - 2019 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.traccar.BaseFrameDecoder;
import io.netty.buffer.ByteBuf;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
public class TeltonikaFrameDecoder extends BaseFrameDecoder {
private static final int MESSAGE_MINIMUM_LENGTH = 12;
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
while (buf.isReadable() && buf.getByte(buf.readerIndex()) == (byte) 0xff) {
buf.skipBytes(1);
}
if (buf.readableBytes() < MESSAGE_MINIMUM_LENGTH) {
return null;
}
int length = buf.getUnsignedShort(buf.readerIndex());
if (length > 0) {
if (buf.readableBytes() >= (length + 2)) {
return buf.readRetainedSlice(length + 2);
}
} else {
int dataLength = buf.getInt(buf.readerIndex() + 4);
if (buf.readableBytes() >= (dataLength + 12)) {
return buf.readRetainedSlice(dataLength + 12);
}
}
return null;
}
}
|
