1 /* Copyright (c) 2001-2014, The HSQL Development Group
2  * All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions are met:
6  *
7  * Redistributions of source code must retain the above copyright notice, this
8  * list of conditions and the following disclaimer.
9  *
10  * Redistributions in binary form must reproduce the above copyright notice,
11  * this list of conditions and the following disclaimer in the documentation
12  * and/or other materials provided with the distribution.
13  *
14  * Neither the name of the HSQL Development Group nor the names of its
15  * contributors may be used to endorse or promote products derived from this
16  * software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
22  * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
26  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29  */
30 
31 
32 package org.hsqldb.lib;
33 
34 import java.io.IOException;
35 import java.io.InputStream;
36 import java.io.Reader;
37 
38 /**
39  * This class is an part implementation of DataInput. It wraps a Reader object.
40  *
41  * @author Fred Toussi (fredt@users dot sourceforge.net)
42  * @version 1.9.0
43  * @since 1.9.0
44  */
45 public class ReaderInputStream extends InputStream {
46 
47     protected Reader reader;
48     protected long    pos;
49     int              lastChar = -1;
50 
ReaderInputStream(Reader reader)51     public ReaderInputStream(Reader reader) {
52         this.reader = reader;
53         this.pos    = 0;
54     }
55 
read()56     public int read() throws IOException {
57 
58         if (lastChar >= 0) {
59             int val = lastChar & 0xff;
60 
61             lastChar = -1;
62 
63             pos++;
64             return val;
65         }
66 
67         lastChar = reader.read();
68 
69         if (lastChar < 0) {
70             return lastChar;
71         }
72 
73         pos++;
74         return lastChar >> 8;
75     }
76 }
77