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Java > Open Source Codes > net > sf > drftpd > util > AddAsciiOutputStream


1 /*
2  * This file is part of DrFTPD, Distributed FTP Daemon.
3  *
4  * DrFTPD is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation; either version 2 of the License, or
7  * (at your option) any later version.
8  *
9  * DrFTPD is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with DrFTPD; if not, write to the Free Software
16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17  */
18 package net.sf.drftpd.util;
19
20 import java.io.IOException JavaDoc;
21 import java.io.OutputStream JavaDoc;
22
23 /**
24  * AddAsciiOutputStream that ignores \r and adds an \r before every \n.
25  *
26  * @author <a HREF="mailto:rana_b@yahoo.com">Rana Bhattacharyya</a>
27  * @version $Id: AddAsciiOutputStream.java,v 1.3 2004/02/10 00:03:31 mog Exp $
28  */
29 public class AddAsciiOutputStream extends OutputStream JavaDoc {
30     private OutputStream JavaDoc _out;
31     private boolean _lastWasCarriageReturn = false;
32
33     /**
34      * Constructor.
35      * @param os <code>java.io.OutputStream</code> to be filtered.
36      */
37     public AddAsciiOutputStream(OutputStream JavaDoc os) {
38         _out = os;
39     }
40
41     /**
42      * Write a single byte.
43      * ASCII characters are defined to be
44      * the lower half of an eight-bit code set (i.e., the most
45      * significant bit is zero). Change "\n" to "\r\n".
46      */
47     public void write(int i) throws IOException JavaDoc {
48         if (i == '\r') {
49             _lastWasCarriageReturn = true;
50         }
51         if (i == '\n') {
52             if (!_lastWasCarriageReturn) {
53                 _out.write('\r');
54             }
55         }
56         _lastWasCarriageReturn = false;
57         _out.write(i);
58     }
59
60     public void close() throws IOException JavaDoc {
61         _out.close();
62     }
63
64     public void flush() throws IOException JavaDoc {
65         _out.flush();
66     }
67 }
68
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