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Java > Open Source Codes > com > lowagie > text > pdf > PdfEncryptionStream


1 /*
2  * $Id: PdfEncryptionStream.java,v 1.3 2005/02/17 09:20:54 blowagie Exp $
3  * $Name: $
4  *
5  * Copyright 2004 Paulo Soares
6  *
7  * The contents of this file are subject to the Mozilla Public License Version 1.1
8  * (the "License"); you may not use this file except in compliance with the License.
9  * You may obtain a copy of the License at http://www.mozilla.org/MPL/
10  *
11  * Software distributed under the License is distributed on an "AS IS" basis,
12  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13  * for the specific language governing rights and limitations under the License.
14  *
15  * The Original Code is 'iText, a free JAVA-PDF library'.
16  *
17  * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
18  * the Initial Developer are Copyright (C) 1999-2005 by Bruno Lowagie.
19  * All Rights Reserved.
20  * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
21  * are Copyright (C) 2000-2005 by Paulo Soares. All Rights Reserved.
22  *
23  * Contributor(s): all the names of the contributors are added in the source code
24  * where applicable.
25  *
26  * Alternatively, the contents of this file may be used under the terms of the
27  * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
28  * provisions of LGPL are applicable instead of those above. If you wish to
29  * allow use of your version of this file only under the terms of the LGPL
30  * License and not to allow others to use your version of this file under
31  * the MPL, indicate your decision by deleting the provisions above and
32  * replace them with the notice and other provisions required by the LGPL.
33  * If you do not delete the provisions above, a recipient may use your version
34  * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
35  *
36  * This library is free software; you can redistribute it and/or modify it
37  * under the terms of the MPL as stated above or under the terms of the GNU
38  * Library General Public License as published by the Free Software Foundation;
39  * either version 2 of the License, or any later version.
40  *
41  * This library is distributed in the hope that it will be useful, but WITHOUT
42  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
43  * FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
44  * details.
45  *
46  * If you didn't download this code from the following link, you should check if
47  * you aren't using an obsolete version:
48  * http://www.lowagie.com/iText/
49  */
50
51 package com.lowagie.text.pdf;
52
53 import java.io.FilterOutputStream;
54 import java.io.OutputStream;
55 import java.io.IOException;
56
57 public class PdfEncryptionStream extends FilterOutputStream {
58     
59     protected PdfEncryption enc;
60     private byte buf[] = new byte[1];
61     
62     public PdfEncryptionStream(OutputStream out, PdfEncryption enc) {
63         super(out);
64         this.enc = enc;
65     }
66     
67     public void write(byte[] b, int off, int len) throws IOException {
68         if ((off | len | (b.length - (len + off)) | (off + len)) < 0)
69             throw new IndexOutOfBoundsException();
70         enc.encryptRC4(b, off, len);
71         out.write(b, off, len);
72     }
73     
74     public void close() throws IOException {
75     }
76     
77     public void write(int b) throws IOException {
78         buf[0] = (byte)b;
79         write(buf);
80     }
81     
82     public void flush() throws IOException {
83     }
84     
85 }
86
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