blob: a50ece6419bb00afafa2d611adfbbeb985821d58 (
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
|
/*
* Copyright 2017 Ivan Muratov (binakot@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 Arnavi4FrameDecoder extends FrameDecoder {
static final int PACKET_MIN_LENGTH = 4;
static final byte HEADER_START_SIGN = (byte) 0xFF;
static final byte HEADER_VERSION_1 = 0x22;
static final byte HEADER_VERSION_2 = 0x23;
static final int HEADER_LENGTH = 10;
static final byte PACKAGE_START_SIGN = 0x5B;
static final byte PACKAGE_END_SIGN = 0x5D;
static final int PACKAGE_MIN_PARCEL_NUMBER = 0x01;
static final int PACKAGE_MAX_PARCEL_NUMBER = 0xFB;
@Override
protected Object decode(
ChannelHandlerContext ctx,
Channel channel,
ChannelBuffer buf) throws Exception {
if (buf.readableBytes() < PACKET_MIN_LENGTH) {
return null;
}
if (buf.getByte(0) == HEADER_START_SIGN
&& buf.readableBytes() == HEADER_LENGTH
&& (buf.getByte(1) == HEADER_VERSION_1 || buf.getByte(1) == HEADER_VERSION_2)) {
return buf.readBytes(HEADER_LENGTH);
}
int parcelNumber = buf.getByte(1) & 0xFF;
if (buf.getByte(0) == PACKAGE_START_SIGN && buf.getByte(buf.readableBytes() - 1) == PACKAGE_END_SIGN
&& parcelNumber >= PACKAGE_MIN_PARCEL_NUMBER && parcelNumber <= PACKAGE_MAX_PARCEL_NUMBER) {
return buf;
}
return null;
}
}
|
