blob: f4b5c8f0b3113fb494d9abf7d49ba7f857aa6bab (
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
|
/*
* Copyright 2015 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 org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.handler.codec.frame.FrameDecoder;
public class AutoFonFrameDecoder extends FrameDecoder {
private static final int MSG_LOGIN = 0x10;
private static final int MSG_LOCATION = 0x11;
private static final int MSG_HISTORY = 0x12;
@Override
protected Object decode(
ChannelHandlerContext ctx,
Channel channel,
ChannelBuffer buf) throws Exception {
// Check minimum length
if (buf.readableBytes() < 12) {
return null;
}
int length = 0;
switch (buf.getUnsignedByte(buf.readerIndex())) {
case MSG_LOGIN:
length = 12;
break;
case MSG_LOCATION:
length = 78;
break;
case MSG_HISTORY:
length = 257;
break;
}
// Check length and return buffer
if (length != 0 && buf.readableBytes() >= length) {
return buf.readBytes(length);
}
return null;
}
}
|
