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Java > Open Source Codes > com > caucho > vfs > Utf16RevReader


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  * Free SoftwareFoundation, Inc.
23  * 59 Temple Place, Suite 330
24  * Boston, MA 02111-1307 USA
25  *
26  * @author Scott Ferguson
27  */
28
29 package com.caucho.vfs;
30
31 import java.io.IOException JavaDoc;
32 import java.io.InputStream JavaDoc;
33 import java.io.Reader JavaDoc;
34
35 class Utf16RevReader extends Reader JavaDoc {
36   private InputStream JavaDoc is;
37
38   /**
39    * Create a UTF-16 reader based on the readStream.
40    */
41   Utf16RevReader(InputStream JavaDoc is)
42   {
43     this.is = is;
44   }
45
46   /**
47    * Reads into a character buffer using the correct encoding.
48    */
49   public int read()
50     throws IOException JavaDoc
51   {
52     int ch1 = is.read();
53     int ch2 = is.read();
54
55     if (ch2 < 0)
56       return -1;
57
58     return (ch2 << 8) + ch1;
59   }
60
61   /**
62    * Reads into a character buffer using the correct encoding.
63    */
64   public int read(char []cbuf, int off, int len)
65     throws IOException JavaDoc
66   {
67     int i = 0;
68
69     for (i = 0; i < len; i++) {
70       int ch1 = is.read();
71       int ch2 = is.read();
72
73       if (ch1 < 0)
74     return i == 0 ? -1 : i;
75
76       cbuf[off + i] = (char) ((ch2 << 8) + ch1);
77     }
78
79     return i;
80   }
81
82   /**
83    * Stub close does nothing.
84    */
85   public void close()
86   {
87   }
88 }
89
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