SSLEngineAppData.java revision 7365de1056414750d0a7d1fdd26025fd247f0d04 
1/*
2 *  Licensed to the Apache Software Foundation (ASF) under one or more
3 *  contributor license agreements.  See the NOTICE file distributed with
4 *  this work for additional information regarding copyright ownership.
5 *  The ASF licenses this file to You under the Apache License, Version 2.0
6 *  (the "License"); you may not use this file except in compliance with
7 *  the License.  You may obtain a copy of the License at
8 *
9 *     http://www.apache.org/licenses/LICENSE-2.0
10 *
11 *  Unless required by applicable law or agreed to in writing, software
12 *  distributed under the License is distributed on an "AS IS" BASIS,
13 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 *  See the License for the specific language governing permissions and
15 *  limitations under the License.
16 */
17
18package org.apache.harmony.xnet.provider.jsse;
19
20import java.nio.ByteBuffer;
21import javax.net.ssl.SSLException;
22
23/**
24 * This class is used to retrieve the application data
25 * arrived for the SSLEngine.
26 */
27public class SSLEngineAppData implements org.apache.harmony.xnet.provider.jsse.Appendable {
28
29    /**
30     * Buffer containing received application data.
31     */
32    byte[] buffer;
33
34    /**
35     * Constructor
36     */
37    protected SSLEngineAppData() {}
38
39    /**
40     * Stores received data. The source data is not cloned,
41     * just the array reference is remembered into the buffer field.
42     */
43    public void append(byte[] src) {
44        if (buffer != null) {
45            throw new AlertException(
46                AlertProtocol.INTERNAL_ERROR,
47                new SSLException("Attempt to override the data"));
48        }
49        buffer = src;
50    }
51
52    /**
53     * Places the data from the buffer into the array of destination
54     * ByteBuffer objects.
55     */
56    protected int placeTo(ByteBuffer[] dsts, int offset, int length) {
57        if (buffer == null) {
58            return 0;
59        }
60        int pos = 0;
61        int len = buffer.length;
62        int rem;
63        // write data to the buffers
64        for (int i=offset; i<offset+length; i++) {
65            rem = dsts[i].remaining();
66            // TODO: optimization work - use hasArray, array(), arraycopy
67            if (len - pos < rem) {
68                // can fully write remaining data into buffer
69                dsts[i].put(buffer, pos, len - pos);
70                pos = len;
71                // data was written, exit
72                break;
73            }
74            // write chunk of data
75            dsts[i].put(buffer, pos, rem);
76            pos += rem;
77        }
78        if (pos != len) {
79            // The data did not feet into the buffers,
80            // it should not happen, because the destination buffers
81            // had been checked for the space before record unwrapping.
82            // But if it so, we should allert about internal error.
83            throw new AlertException(
84                AlertProtocol.INTERNAL_ERROR,
85                new SSLException(
86                    "The received application data could not be fully written"
87                    + "into the destination buffers"));
88        }
89        buffer = null;
90        return len;
91    }
92}
93
94