StringInputStream


1   /* Copyright (c) 2001-2005, 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:
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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
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15   * contributors may be used to endorse or promote products derived from this
16   * software without specific prior written permission.
17   *
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20   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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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  
37  /**
38   * minimal InputStream subclass to fetch bytes form a String
39   *
40   * @author fredt@users
41   * @version 1.7.0
42   */
43  public class StringInputStream extends InputStream   {
44  
45      protected int    strOffset  = 0;
46      protected int    charOffset = 0;
47      protected int    available;
48      protected String   str;
49  
50      public StringInputStream(String   s) {
51          str       = s;
52          available = s.length() * 2;
53      }
54  
55      public int read() throws java.io.IOException   {
56  
57          if (available == 0) {
58              return -1;
59          }
60  
61          available--;
62  
63          char c = str.charAt(strOffset);
64  
65          if (charOffset == 0) {
66              charOffset = 1;
67  
68              return (c & 0x0000ff00) >> 8;
69          } else {
70              charOffset = 0;
71  
72              strOffset++;
73  
74              return c & 0x000000ff;
75          }
76      }
77  
78      public int available() throws IOException   {
79          return available;
80      }
81  }
82
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