KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > com > quadcap > io > PaddedOutputStream


1 package com.quadcap.io;
2
3 /* Copyright 1997 - 2003 Quadcap Software. All rights reserved.
4  *
5  * This software is distributed under the Quadcap Free Software License.
6  * This software may be used or modified for any purpose, personal or
7  * commercial. Open Source redistributions are permitted. Commercial
8  * redistribution of larger works derived from, or works which bundle
9  * this software requires a "Commercial Redistribution License"; see
10  * http://www.quadcap.com/purchase.
11  *
12  * Redistributions qualify as "Open Source" under one of the following terms:
13  *
14  * Redistributions are made at no charge beyond the reasonable cost of
15  * materials and delivery.
16  *
17  * Redistributions are accompanied by a copy of the Source Code or by an
18  * irrevocable offer to provide a copy of the Source Code for up to three
19  * years at the cost of materials and delivery. Such redistributions
20  * must allow further use, modification, and redistribution of the Source
21  * Code under substantially the same terms as this license.
22  *
23  * Redistributions of source code must retain the copyright notices as they
24  * appear in each source code file, these license terms, and the
25  * disclaimer/limitation of liability set forth as paragraph 6 below.
26  *
27  * Redistributions in binary form must reproduce this Copyright Notice,
28  * these license terms, and the disclaimer/limitation of liability set
29  * forth as paragraph 6 below, in the documentation and/or other materials
30  * provided with the distribution.
31  *
32  * The Software is provided on an "AS IS" basis. No warranty is
33  * provided that the Software is free of defects, or fit for a
34  * particular purpose.
35  *
36  * Limitation of Liability. Quadcap Software shall not be liable
37  * for any damages suffered by the Licensee or any third party resulting
38  * from use of the Software.
39  */
40
41 import java.io.*;
42 import java.security.SecureRandom JavaDoc;
43
44 import com.quadcap.util.Debug;
45 import com.quadcap.util.Util;
46
47 /**
48  * A filter output stream that zero-pads (on close) to fill the last block
49  * of a specified
50  * size
51  *
52  * @author Stan Bailes
53  */
54
55 public class PaddedOutputStream extends CountedOutputStream {
56     int blockSize;
57     
58     public PaddedOutputStream(OutputStream os, int blockSize) {
59         super(os);
60         this.blockSize = blockSize;
61     }
62
63     public void close() throws IOException {
64         int c = count;
65         byte bytes[] = new byte[blockSize - count % blockSize];
66         new SecureRandom JavaDoc().nextBytes(bytes);
67         out.write(bytes);
68         out.close();
69     }
70 }
71
Popular Tags