1 /*
   2  * Copyright (c) 1996, 2002, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.corba.se.impl.orbutil;
  27 
  28 import java.io.StringWriter;
  29 import java.io.OutputStream;
  30 import java.io.IOException;
  31 
  32 /**
  33  * Writes each input byte as a 2 byte hexidecimal output pair making it
  34  * possible to turn arbitrary binary data into an ASCII format.
  35  * The high 4 bits of the byte is translated into the first byte.
  36  *
  37  * @author      Jeff Nisewanger
  38  */
  39 public class HexOutputStream extends OutputStream
  40 {
  41     static private final char hex[] = {
  42         '0', '1', '2', '3', '4', '5', '6', '7',
  43         '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
  44     };
  45 
  46     private StringWriter writer;
  47 
  48     /**
  49      * Creates a new HexOutputStream.
  50      * @param w The underlying StringWriter.
  51      */
  52     public
  53         HexOutputStream(StringWriter w) {
  54         writer = w;
  55     }
  56 
  57 
  58     /**
  59      * Writes a byte. Will block until the byte is actually
  60      * written.
  61      * param b The byte to write out.
  62      * @exception java.io.IOException I/O error occurred.
  63      */
  64     public synchronized void write(int b) throws IOException {
  65         writer.write(hex[((b >> 4) & 0xF)]);
  66         writer.write(hex[((b >> 0) & 0xF)]);
  67     }
  68 
  69     public synchronized void write(byte[] b) throws IOException {
  70         write(b, 0, b.length);
  71     }
  72 
  73     public synchronized void write(byte[] b, int off, int len)
  74         throws IOException
  75     {
  76         for(int i=0; i < len; i++) {
  77             write(b[off + i]);
  78         }
  79     }
  80 }