ExactUTF8InputStreamReader


1   /*
2    * Copyright 2004-2006 H2 Group. Licensed under the H2 License, Version 1.0 (http://h2database.com/html/license.html).
3    * Initial Developer: H2 Group
4    */
5   package org.h2.util;
6   
7   import java.io.IOException  ;
8   import java.io.InputStream  ;
9   import java.io.Reader  ;
10  
11  /**
12   * The regular InputStreamReader may read some more bytes than required.
13   * If this is a problem, use this class.
14   */
15  public class ExactUTF8InputStreamReader extends Reader   {
16      
17      private InputStream   in;
18      
19      public ExactUTF8InputStreamReader(InputStream   in) {
20          this.in = in;
21      }
22  
23      public void close() throws IOException   {
24      }
25  
26      public int read(char[] cbuf, int off, int len) throws IOException   {
27          for(int i=0; i<len; i++, off++) {
28              int x = in.read();
29              if(x < 0) {
30                  return i == 0 ? -1 : i;
31              }
32              x = x & 0xff;
33              if(x < 0x80) {
34                  cbuf[off] = (char)x;
35              } else if(x >= 0xe0) {
36                  cbuf[off] = (char)(((x & 0xf) << 12) + ((in.read() & 0x3f) << 6) + (in.read() & 0x3f));
37              } else {
38                  cbuf[off] = (char)(((x & 0x1f) << 6) + (in.read() & 0x3f));
39              }
40          }
41          return len;
42      }
43  
44  }
45

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