1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
|
/*
* MessageOutputStream.java
* Copyright (C) 2002 The Free Software Foundation
*
* This file is part of GNU inetlib, a library.
*
* GNU inetlib is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GNU inetlib is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Linking this library statically or dynamically with other modules is
* making a combined work based on this library. Thus, the terms and
* conditions of the GNU General Public License cover the whole
* combination.
*
* As a special exception, the copyright holders of this library give you
* permission to link this library with independent modules to produce an
* executable, regardless of the license terms of these independent
* modules, and to copy and distribute the resulting executable under
* terms of your choice, provided that you also meet, for each linked
* independent module, the terms and conditions of the license of that
* module. An independent module is a module which is not derived from
* or based on this library. If you modify this library, you may extend
* this exception to your version of the library, but you are not
* obliged to do so. If you do not wish to do so, delete this
* exception statement from your version.
*/
package gnu.inet.util;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
/**
* An output stream that escapes any dots on a line by themself with
* another dot, for the purposes of sending messages to SMTP and NNTP
* servers.
*
* @author <a href="mailto:dog@gnu.org">Chris Burdess</a>
*/
public class MessageOutputStream
extends FilterOutputStream
{
/**
* The stream termination octet.
*/
public static final int END = 46;
/**
* The line termination octet.
*/
public static final int LF = 10;
int[] last = { LF, LF }; // the last character written to the stream
/**
* Constructs a message output stream connected to the specified output
* stream.
* @param out the target output stream
*/
public MessageOutputStream(OutputStream out)
{
super(out);
}
/**
* Character write.
*/
public void write(int c)
throws IOException
{
if (last[0] == LF && last[1] == END && c == LF)
{
out.write (END);
}
out.write(c);
last[0] = last[1];
last[1] = c;
}
public void write(byte[] bytes)
throws IOException
{
write(bytes, 0, bytes.length);
}
/**
* Block write.
*/
public void write(byte[] bytes, int off, int len)
throws IOException
{
for (int i = 0; i < len; i++)
{
int c = (int) bytes[off + i];
if (last[0] == LF && last[1] == END && c == LF)
{
byte[] b2 = new byte[bytes.length + 1];
System.arraycopy(bytes, off, b2, off, i);
b2[off + i] = END;
System.arraycopy(bytes, off + i, b2, off + i + 1, len - i);
bytes = b2;
i++;
len++;
}
last[0] = last[1];
last[1] = c;
}
out.write(bytes, off, len);
}
}
|
