01: /* Copyright (c) 2001-2005, The HSQL Development Group
02: * All rights reserved.
03: *
04: * Redistribution and use in source and binary forms, with or without
05: * modification, are permitted provided that the following conditions are met:
06: *
07: * Redistributions of source code must retain the above copyright notice, this
08: * list of conditions and the following disclaimer.
09: *
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: package org.hsqldb.lib;
32:
33: import java.io.IOException;
34: import java.io.InputStream;
35:
36: /**
37: * minimal InputStream subclass to fetch bytes form a String
38: *
39: * @author fredt@users
40: * @version 1.7.0
41: */
42: public class StringInputStream extends InputStream {
43:
44: protected int strOffset = 0;
45: protected int charOffset = 0;
46: protected int available;
47: protected String str;
48:
49: public StringInputStream(String s) {
50: str = s;
51: available = s.length() * 2;
52: }
53:
54: public int read() throws java.io.IOException {
55:
56: if (available == 0) {
57: return -1;
58: }
59:
60: available--;
61:
62: char c = str.charAt(strOffset);
63:
64: if (charOffset == 0) {
65: charOffset = 1;
66:
67: return (c & 0x0000ff00) >> 8;
68: } else {
69: charOffset = 0;
70:
71: strOffset++;
72:
73: return c & 0x000000ff;
74: }
75: }
76:
77: public int available() throws IOException {
78: return available;
79: }
80: }
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