01: /*
02: * This file is part of DrFTPD, Distributed FTP Daemon.
03: *
04: * DrFTPD is free software; you can redistribute it and/or modify
05: * it under the terms of the GNU General Public License as published by
06: * the Free Software Foundation; either version 2 of the License, or
07: * (at your option) any later version.
08: *
09: * 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 org.drftpd.io;
19:
20: import java.io.IOException;
21: import java.io.OutputStream;
22:
23: /**
24: * AddAsciiOutputStream that ensures that there's an \r before every \n.
25: *
26: * @author <a href="mailto:rana_b@yahoo.com">Rana Bhattacharyya</a>
27: * @version $Id: AddAsciiOutputStream.java 1513 2006-10-13 22:41:08Z tdsoul $
28: */
29: public class AddAsciiOutputStream extends OutputStream {
30: private OutputStream _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 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 {
48: if ((i == '\n') && !_lastWasCarriageReturn) {
49: _out.write('\r');
50: }
51:
52: _lastWasCarriageReturn = false;
53:
54: if (i == '\r') {
55: _lastWasCarriageReturn = true;
56: }
57:
58: _out.write(i);
59: }
60:
61: public void close() throws IOException {
62: _out.close();
63: }
64:
65: public void flush() throws IOException {
66: _out.flush();
67: }
68: }
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