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
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.qpid.framing;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.qpid.codec.MarkableDataInput;
import java.io.IOException;
public class AMQDataBlockDecoder
{
private static final BodyFactory[] _bodiesSupported = new BodyFactory[Byte.MAX_VALUE];
static
{
_bodiesSupported[ContentHeaderBody.TYPE] = ContentHeaderBodyFactory.getInstance();
_bodiesSupported[ContentBody.TYPE] = ContentBodyFactory.getInstance();
_bodiesSupported[HeartbeatBody.TYPE] = new HeartbeatBodyFactory();
}
private Logger _logger = LoggerFactory.getLogger(AMQDataBlockDecoder.class);
public AMQDataBlockDecoder()
{ }
public boolean decodable(MarkableDataInput in) throws AMQFrameDecodingException, IOException
{
final int remainingAfterAttributes = in.available() - (1 + 2 + 4 + 1);
// type, channel, body length and end byte
if (remainingAfterAttributes < 0)
{
return false;
}
in.mark(8);
in.skip(1 + 2);
// Get an unsigned int, lifted from MINA ByteBuffer getUnsignedInt()
final long bodySize = in.readInt() & 0xffffffffL;
in.reset();
return (remainingAfterAttributes >= bodySize);
}
public AMQFrame createAndPopulateFrame(AMQMethodBodyFactory methodBodyFactory, MarkableDataInput in)
throws AMQFrameDecodingException, AMQProtocolVersionException, IOException
{
final byte type = in.readByte();
BodyFactory bodyFactory;
if (type == AMQMethodBody.TYPE)
{
bodyFactory = methodBodyFactory;
}
else
{
bodyFactory = _bodiesSupported[type];
}
if (bodyFactory == null)
{
throw new AMQFrameDecodingException(null, "Unsupported frame type: " + type, null);
}
final int channel = in.readUnsignedShort();
final long bodySize = EncodingUtils.readUnsignedInteger(in);
// bodySize can be zero
if ((channel < 0) || (bodySize < 0))
{
throw new AMQFrameDecodingException(null, "Undecodable frame: type = " + type + " channel = " + channel
+ " bodySize = " + bodySize, null);
}
AMQFrame frame = new AMQFrame(in, channel, bodySize, bodyFactory);
byte marker = in.readByte();
if ((marker & 0xFF) != 0xCE)
{
throw new AMQFrameDecodingException(null, "End of frame marker not found. Read " + marker + " length=" + bodySize
+ " type=" + type, null);
}
return frame;
}
}
|
