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Java > Open Source Codes > com > quadcap > sql > types > ByteReader


1 package com.quadcap.sql.types;
2
3 /* Copyright 2002 - 2003 Quadcap Software. All rights reserved.
4  *
5  * This software is distributed under the Quadcap Free Software License.
6  * This software may be used or modified for any purpose, personal or
7  * commercial. Open Source redistributions are permitted. Commercial
8  * redistribution of larger works derived from, or works which bundle
9  * this software requires a "Commercial Redistribution License"; see
10  * http://www.quadcap.com/purchase.
11  *
12  * Redistributions qualify as "Open Source" under one of the following terms:
13  *
14  * Redistributions are made at no charge beyond the reasonable cost of
15  * materials and delivery.
16  *
17  * Redistributions are accompanied by a copy of the Source Code or by an
18  * irrevocable offer to provide a copy of the Source Code for up to three
19  * years at the cost of materials and delivery. Such redistributions
20  * must allow further use, modification, and redistribution of the Source
21  * Code under substantially the same terms as this license.
22  *
23  * Redistributions of source code must retain the copyright notices as they
24  * appear in each source code file, these license terms, and the
25  * disclaimer/limitation of liability set forth as paragraph 6 below.
26  *
27  * Redistributions in binary form must reproduce this Copyright Notice,
28  * these license terms, and the disclaimer/limitation of liability set
29  * forth as paragraph 6 below, in the documentation and/or other materials
30  * provided with the distribution.
31  *
32  * The Software is provided on an "AS IS" basis. No warranty is
33  * provided that the Software is free of defects, or fit for a
34  * particular purpose.
35  *
36  * Limitation of Liability. Quadcap Software shall not be liable
37  * for any damages suffered by the Licensee or any third party resulting
38  * from use of the Software.
39  */
40
41 import java.io.IOException JavaDoc;
42 import java.io.InputStream JavaDoc;
43 import java.io.Reader JavaDoc;
44
45 import com.quadcap.util.Debug;
46
47 /**
48  * An adaptor class which takes an inputstream containing two-byte pairs,
49  * each pair representing a character, and wraps a Reader interface around
50  * the stream
51  *
52  * @author Stan Bailes
53  */
54 public class ByteReader extends Reader JavaDoc {
55     InputStream JavaDoc in;
56     
57     public ByteReader(InputStream JavaDoc in) {
58         this.in = in;
59     }
60
61     public int read() throws IOException JavaDoc {
62         int c = in.read();
63         if (c < 0) return -1;
64         int c2 = in.read();
65         if (c2 < 0) return -1;
66         int ret = ((c & 0xff) << 8) | (c2 & 0xff);
67         return ret;
68     }
69
70     public int read(char[] buf, int pos, int len) throws IOException JavaDoc {
71         int cnt = 0;
72         while (cnt < len) {
73             int c = read();
74             if (c < 0) break;
75             buf[pos + (cnt++)] = (char)c;
76         }
77         return cnt;
78     }
79
80     public void close() throws IOException JavaDoc {
81         in.close();
82     }
83 }
84
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