1 package org.apache.commons.net.telnet;
2
3 /* ====================================================================
4 * The Apache Software License, Version 1.1
5 *
6 * Copyright (c) 2001 The Apache Software Foundation. All rights
7 * reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. The end-user documentation included with the redistribution,
22 * if any, must include the following acknowledgment:
23 * "This product includes software developed by the
24 * Apache Software Foundation (http://www.apache.org/)."
25 * Alternately, this acknowledgment may appear in the software itself,
26 * if and wherever such third-party acknowledgments normally appear.
27 *
28 * 4. The names "Apache" and "Apache Software Foundation" and
29 * "Apache Commons" must not be used to endorse or promote products
30 * derived from this software without prior written permission. For
31 * written permission, please contact apache@apache.org.
32 *
33 * 5. Products derived from this software may not be called "Apache",
34 * nor may "Apache" appear in their name, without
35 * prior written permission of the Apache Software Foundation.
36 *
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48 * SUCH DAMAGE.
49 * ====================================================================
50 *
51 * This software consists of voluntary contributions made by many
52 * individuals on behalf of the Apache Software Foundation. For more
53 * information on the Apache Software Foundation, please see
54 * <http://www.apache.org/>.
55 */
56
57 import java.io.IOException;
58 import java.io.OutputStream;
59
60 /****
61 *
62 * <p>
63 *
64 * <p>
65 * <p>
66 * @author Daniel F. Savarese
67 ***/
68
69
70 final class TelnetOutputStream extends OutputStream
71 {
72 private TelnetClient __client;
73 private boolean __convertCRtoCRLF = true;
74 private boolean __lastWasCR = false;
75
76 TelnetOutputStream(TelnetClient client)
77 {
78 __client = client;
79 }
80
81
82 /****
83 * Writes a byte to the stream.
84 * <p>
85 * @param ch The byte to write.
86 * @exception IOException If an error occurs while writing to the underlying
87 * stream.
88 ***/
89 public void write(int ch) throws IOException
90 {
91
92 synchronized (__client)
93 {
94 ch &= 0xff;
95
96 if (__client._requestedWont(TelnetOption.BINARY))
97 {
98 if (__lastWasCR)
99 {
100 if (__convertCRtoCRLF)
101 {
102 __client._sendByte('\n');
103 if (ch == '\n')
104 {
105 __lastWasCR = false;
106 return ;
107 }
108 }
109 else if (ch != '\n')
110 __client._sendByte('\0');
111 }
112
113 __lastWasCR = false;
114
115 switch (ch)
116 {
117 case '\r':
118 __client._sendByte('\r');
119 __lastWasCR = true;
120 break;
121 case TelnetCommand.IAC:
122 __client._sendByte(TelnetCommand.IAC);
123 __client._sendByte(TelnetCommand.IAC);
124 break;
125 default:
126 __client._sendByte(ch);
127 break;
128 }
129 }
130 else if (ch == TelnetCommand.IAC)
131 {
132 __client._sendByte(ch);
133 __client._sendByte(TelnetCommand.IAC);
134 }
135 else
136 __client._sendByte(ch);
137 }
138 }
139
140
141 /****
142 * Writes a byte array to the stream.
143 * <p>
144 * @param buffer The byte array to write.
145 * @exception IOException If an error occurs while writing to the underlying
146 * stream.
147 ***/
148 public void write(byte buffer[]) throws IOException
149 {
150 write(buffer, 0, buffer.length);
151 }
152
153
154 /****
155 * Writes a number of bytes from a byte array to the stream starting from
156 * a given offset.
157 * <p>
158 * @param buffer The byte array to write.
159 * @param offset The offset into the array at which to start copying data.
160 * @param length The number of bytes to write.
161 * @exception IOException If an error occurs while writing to the underlying
162 * stream.
163 ***/
164 public void write(byte buffer[], int offset, int length) throws IOException
165 {
166 synchronized (__client)
167 {
168 while (length-- > 0)
169 write(buffer[offset++]);
170 }
171 }
172
173 /**** Flushes the stream. ***/
174 public void flush() throws IOException
175 {
176 __client._flushOutputStream();
177 }
178
179 /**** Closes the stream. ***/
180 public void close() throws IOException
181 {
182 __client._closeOutputStream();
183 }
184 }
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