blob: d4650d966f15c66030cc654bfb8c2f791ad6de70 (
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
70
71
72
73
|
/*
* Copyright 2013 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;
import org.traccar.helper.Log;
public class CellocatorFrameDecoder extends FrameDecoder {
private static final int MESSAGE_MINIMUM_LENGTH = 15;
@Override
protected Object decode(
ChannelHandlerContext ctx,
Channel channel,
ChannelBuffer buf) throws Exception {
// Check minimum length
int available = buf.readableBytes();
if (available < MESSAGE_MINIMUM_LENGTH) {
return null;
}
// Size depending on message type
int length = 0;
switch (buf.getUnsignedByte(4)) {
case CellocatorProtocolDecoder.MSG_CLIENT_STATUS:
length = 70;
break;
case CellocatorProtocolDecoder.MSG_CLIENT_PROGRAMMING:
length = 31;
break;
case CellocatorProtocolDecoder.MSG_CLIENT_SERIAL_LOG:
length = 70;
break;
case CellocatorProtocolDecoder.MSG_CLIENT_SERIAL:
if (available >= 19) {
length = 19 + buf.getUnsignedShort(16);
}
break;
case CellocatorProtocolDecoder.MSG_CLIENT_MODULAR:
length = 15 + buf.getUnsignedByte(13);
break;
default:
Log.warning(new UnsupportedOperationException());
break;
}
// Read packet
if (length > 0 && available >= length) {
return buf.readBytes(length);
}
return null;
}
}
|
