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1   /********************************************************************************
2    * $Id: HexEncodingOutputStream.java 395 2007-09-09 17:40:33Z pgmjsd $
3    * $Author: pgmjsd $
4    * $Date: 2007-09-09 13:40:33 -0400 (Sun, 09 Sep 2007) $
5    *
6    * Copyright 2002-2003  YAJUL Developers, Joshua Davis, Kent Vogel.
7    *
8    * Permission is hereby granted, free of charge, to any person obtaining a copy
9    * of this software and associated documentation files (the "Software"), to deal
10   * in the Software without restriction, including without limitation the rights
11   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12   * copies of the Software, and to permit persons to whom the Software is
13   * furnished to do so, subject to the following conditions:
14   *
15   * The above copyright notice and this permission notice shall be included in
16   * all copies or substantial portions of the Software.
17   *
18   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
21   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24   * THE SOFTWARE.
25   *
26   ******************************************************************************/
27  package org.yajul.io;
28  
29  import org.yajul.util.StringUtil;
30  import org.yajul.util.Bytes;
31  
32  import java.io.FilterOutputStream;
33  import java.io.IOException;
34  import java.io.OutputStream;
35  
36  /***
37   * Encodes the input in hexadecimal form.
38   * User: josh
39   * Date: Jan 23, 2004
40   * Time: 9:20:13 AM
41   */
42  public class HexEncodingOutputStream extends FilterOutputStream {
43      /***
44       * Hex chars buffer. *
45       */
46      private char[] hex;
47      /***
48       * Hex byte buffer. *
49       */
50      private byte[] hexBytes;
51      /***
52       * The hexadecimal encoding character set. *
53       */
54      private char[] hexEncodingChars;
55  
56      public HexEncodingOutputStream(OutputStream out) {
57          super(out);
58          hexBytes = new byte[2];
59          hex = new char[2];
60          hexEncodingChars = Bytes.HEX_CHARS_LOWER;
61      }
62  
63      public void write(int b) throws IOException {
64          writeHex(b);
65      }
66  
67      protected void writeHex(int b) throws IOException {
68          StringUtil.hexChars(hexEncodingChars, b, hex);
69          hexBytes[0] = (byte) hex[0];
70          hexBytes[1] = (byte) hex[1];
71          out.write(hexBytes);
72      }
73  }