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org.apache.commons.net.io.ToNetASCIIInputStream	0%	0%

1		/*
2		* Copyright 2001-2005 The Apache Software Foundation
3		*
4		* Licensed under the Apache License, Version 2.0 (the "License");
5		* you may not use this file except in compliance with the License.
6		* You may obtain a copy of the License at
7		*
8		* http://www.apache.org/licenses/LICENSE-2.0
9		*
10		* Unless required by applicable law or agreed to in writing, software
11		* distributed under the License is distributed on an "AS IS" BASIS,
12		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13		* See the License for the specific language governing permissions and
14		* limitations under the License.
15		*/
16		package org.apache.commons.net.io;
17
18		import java.io.FilterInputStream;
19		import java.io.IOException;
20		import java.io.InputStream;
21
22		/***
23		* This class wraps an input stream, replacing all singly occurring
24		* <LF> (linefeed) characters with <CR><LF> (carriage return
25		* followed by linefeed), which is the NETASCII standard for representing
26		* a newline.
27		* You would use this class to implement ASCII file transfers requiring
28		* conversion to NETASCII.
29		* <p>
30		* <p>
31		* @author Daniel F. Savarese
32		***/
33
34		public final class ToNetASCIIInputStream extends FilterInputStream
35		{
36		private static final int __NOTHING_SPECIAL = 0;
37		private static final int __LAST_WAS_CR = 1;
38		private static final int __LAST_WAS_NL = 2;
39		private int __status;
40
41		/***
42		* Creates a ToNetASCIIInputStream instance that wraps an existing
43		* InputStream.
44		* <p>
45		* @param input The InputStream to .
46		***/
47		public ToNetASCIIInputStream(InputStream input)
48		{
49	0	super(input);
50	0	__status = __NOTHING_SPECIAL;
51	0	}
52
53
54		/***
55		* Reads and returns the next byte in the stream. If the end of the
56		* message has been reached, returns -1.
57		* <p>
58		* @return The next character in the stream. Returns -1 if the end of the
59		* stream has been reached.
60		* @exception IOException If an error occurs while reading the underlying
61		* stream.
62		***/
63		public int read() throws IOException
64		{
65		int ch;
66
67	0	if (__status == __LAST_WAS_NL)
68		{
69	0	__status = __NOTHING_SPECIAL;
70	0	return '\n';
71		}
72
73	0	ch = in.read();
74
75	0	switch (ch)
76		{
77		case '\r':
78	0	__status = __LAST_WAS_CR;
79	0	return '\r';
80		case '\n':
81	0	if (__status != __LAST_WAS_CR)
82		{
83	0	__status = __LAST_WAS_NL;
84	0	return '\r';
85		}
86		// else fall through
87		default:
88	0	__status = __NOTHING_SPECIAL;
89	0	return ch;
90		}
91		// statement not reached
92		//return ch;
93		}
94
95
96		/***
97		* Reads the next number of bytes from the stream into an array and
98		* returns the number of bytes read. Returns -1 if the end of the
99		* stream has been reached.
100		* <p>
101		* @param buffer The byte array in which to store the data.
102		* @return The number of bytes read. Returns -1 if the
103		* end of the message has been reached.
104		* @exception IOException If an error occurs in reading the underlying
105		* stream.
106		***/
107		public int read(byte buffer[]) throws IOException
108		{
109	0	return read(buffer, 0, buffer.length);
110		}
111
112
113		/***
114		* Reads the next number of bytes from the stream into an array and returns
115		* the number of bytes read. Returns -1 if the end of the
116		* message has been reached. The characters are stored in the array
117		* starting from the given offset and up to the length specified.
118		* <p>
119		* @param buffer The byte array in which to store the data.
120		* @param offset The offset into the array at which to start storing data.
121		* @param length The number of bytes to read.
122		* @return The number of bytes read. Returns -1 if the
123		* end of the stream has been reached.
124		* @exception IOException If an error occurs while reading the underlying
125		* stream.
126		***/
127		public int read(byte buffer[], class="keyword">int offset, class="keyword">int length) throws IOException
128		{
129		int ch, off;
130
131	0	if (length < 1)
132	0	return 0;
133
134	0	ch = available();
135
136	0	if (length > ch)
137	0	length = ch;
138
139		// If nothing is available, block to read only one character
140	0	if (length < 1)
141	0	length = 1;
142
143	0	if ((ch = read()) == -1)
144	0	return -1;
145
146	0	off = offset;
147
148		do
149		{
150	0	buffer[offset++] = (byte)ch;
151		}
152	0	while (--length > 0 && (ch = read()) != -1);
153
154	0	return (offset - off);
155		}
156
157		/*** Returns false. Mark is not supported. ***/
158		public boolean markSupported()
159		{
160	0	return false;
161		}
162
163		public int available() throws IOException
164		{
165		int result;
166
167	0	result = in.available();
168
169	0	if (__status == __LAST_WAS_NL)
170	0	return (result + 1);
171
172	0	return result;
173		}
174		}

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