Source for gnu.java.security.util.ByteArray

   1: /* ByteArray.java -- wrapper around a byte array, with nice toString output.
   2:    Copyright (C) 2005  Free Software Foundation, Inc.
   3: 
   4: This file is part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2, or (at your option)
   9: any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version. */
  37: 
  38: 
  39: package gnu.java.security.util;
  40: 
  41: import java.io.PrintWriter;
  42: import java.io.StringWriter;
  43: 
  44: public final class ByteArray
  45: {
  46:   private final byte[] value;
  47: 
  48:   public ByteArray (final byte[] value)
  49:   {
  50:     this.value = value;
  51:   }
  52: 
  53:   public byte[] getValue ()
  54:   {
  55:     return value;
  56:   }
  57: 
  58:   public String toString ()
  59:   {
  60:     StringWriter str = new StringWriter ();
  61:     PrintWriter out = new PrintWriter (str);
  62:     int i = 0;
  63:     int len = value.length;
  64:     while (i < len)
  65:       {
  66:     out.print (formatInt (i, 16, 8));
  67:     out.print ("  ");
  68:     int l = Math.min (16, len - i);
  69:     String s = toHexString (value, i, l, ' ');
  70:     out.print (s);
  71:     for (int j = 56 - (56 - s.length ()); j < 56; j++)
  72:       out.print (" ");
  73:     for (int j = 0; j < l; j++)
  74:       {
  75:         byte b = value[i+j];
  76:         if ((b & 0xFF) < 0x20 || (b & 0xFF) > 0x7E)
  77:           out.print (".");
  78:         else
  79:           out.print ((char) (b & 0xFF));
  80:       }
  81:     out.println ();
  82:     i += 16;
  83:       }
  84:     return str.toString ();
  85:   }
  86: 
  87:   public static String toHexString (byte[] buf, int off, int len, char sep)
  88:   {
  89:     StringBuffer str = new StringBuffer();
  90:     for (int i = 0; i < len; i++)
  91:       {
  92:     str.append (Character.forDigit (buf[i+off] >>> 4 & 0x0F, 16));
  93:     str.append (Character.forDigit (buf[i+off] & 0x0F, 16));
  94:         if (i < len - 1)
  95:           str.append(sep);
  96:       }
  97:     return str.toString();
  98:   }
  99: 
 100:   public static String formatInt (int value, int radix, int len)
 101:   {
 102:     String s = Integer.toString (value, radix);
 103:     StringBuffer buf = new StringBuffer ();
 104:     for (int j = 0; j < len - s.length(); j++)
 105:       buf.append ("0");
 106:     buf.append (s);
 107:     return buf.toString();
 108:   }
 109: }