
  public static void dumpHex( StringBuffer sb, byte[] b )
  {
    for( int i = 0 ; i < b.length ; ++i )
    {
      if( i % 16 == 0 )
      {
        sb.append( Integer.toHexString( ( i & 0xFFFF ) | 0x10000 ).substring( 1, 5 ) + " - " ) ;
      }
      sb.append( Integer.toHexString( ( b[ i ] & 0xFF ) | 0x100 ).substring( 1, 3 ) + " " ) ;
      if( i % 16 == 15 || i == b.length - 1 )
      {
        int j ;
        for( j = 16 - i % 16 ; j > 1 ; --j )
          sb.append( "   " ) ;
        sb.append( " - " ) ;
        int start = ( i / 16 ) * 16 ;
        int end = ( b.length < i + 1 ) ? b.length : ( i + 1 ) ;
        for( j = start ; j < end ; ++j )
          if( b[ j ] >= 32 && b[ j ] <= 126 )
            sb.append( ( char )b[ j ] ) ;
          else
            sb.append( "." ) ;
        sb.append( "\n" ) ;
      }
    }
  }

  public static void dumpHex( byte[] b )
  {
    StringBuffer sb = new StringBuffer() ;
    dumpHex( sb, b ) ;
    System.out.println( sb.toString() ) ;
  }