Class: ANSI::HexDump

Inherits:
Object
  • Object
show all
Defined in:
lib/ansi/hexdump.rb

Overview

Create a colorized hex dump of byte string.

Output looks something like the following, but colorized.

000352c0:  ed 33 8c 85 6e cc f6 f7  72 79 1c e3 3a b4 c2 c6  |.3..n...ry..:...|
000352d0:  c8 8d d6 ee 3e 68 a1 a5  ae b2 b7 97 a4 1d 5f a7  |....>h........_.|
000352e0:  d8 7d 28 db f6 8a e7 8a  7b 8d 0b bd 35 7d 25 3c  |.}(.....{...5}%<|
000352f0:  8b 3c c8 9d ec 04 85 54  92 a0 f7 a8 ed cf 05 7d  |.<.....T.......}|
00035300:  b5 e3 9e 35 f0 79 9f 51  74 e3 60 ee 0f 03 8e 3f  |...5.y.Qt.`....?|
00035310:  05 5b 91 87 e6 48 48 ee  a3 77 ae ad 5e 2a 56 a2  |.[...HH..w..^*V.|
00035320:  b6 96 86 f3 3c 92 b3 c8  62 4a 6f 96 10 5c 9c bb  |....<...bJo..\..|

In the future, we will make the colorization more customizable and allow the groupings to be selectable at 2, 4, 8 or 16.

Constant Summary collapse

ASCII_PRINTABLE =

Printable ASCII codes.

(33..126)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ HexDump

Returns a new instance of HexDump.



29
30
31
32
33
34
35
36
37
 
# File 'lib/ansi/hexdump.rb', line 29

def initialize(options={})
  @offset = 0

  options.each do |k,v|
    __send__("#{k}=", v)
  end

  @color = true if color.nil?
end

Instance Attribute Details

#color ⇒ Object

Use color?



40
41
42
 
# File 'lib/ansi/hexdump.rb', line 40

def color
  @color
end

#index ⇒ Object

Show index?



43
44
45
 
# File 'lib/ansi/hexdump.rb', line 43

def index
  @index
end

#offset ⇒ Object

Offset byte count.



46
47
48
 
# File 'lib/ansi/hexdump.rb', line 46

def offset
  @offset
end

Instance Method Details

#dump(data) ⇒ Object

Dump data string as colorized hex table.

Parameters:

  • data (String) —

    String to convert to hex and display.



53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
 
# File 'lib/ansi/hexdump.rb', line 53

def dump(data)
  lines             = data.to_s.scan(/.{1,16}/m)
  max_offset        = (offset + data.size) / 256  #16 * 16
  max_offset_width  = max_offset.to_s.size + 1
  max_hex_width     = 49  #3 * 16 + 1

  out = template()
  off = offset()

  if index?
    puts((' ' * max_offset_width) + "    0  1  2  3  4  5  6  7   8  9  A  B  C  D  E  F\n")
  end

  lines.each_with_index do |line, n|
    offset = off + n * 16
    bytes  = line.unpack("C*")
    hex    = bytes.map{ |c| "%0.2x" % c }.insert(8, '').join(' ')

    plain = bytes.map do |c|
      if ASCII_PRINTABLE.include?(c)
        c = c.chr
      else
        color ? Code::WHITE + Code::STRIKE + '.' + Code::CLEAR : '.' 
      end
    end.join('')

    fill = [offset.to_s.rjust(max_offset_width), hex.ljust(max_hex_width), plain]

    puts(out % fill)
  end      
end

#dump_random(size = 64) ⇒ Object

Hex dump a random string.



87
88
89
90
 
# File 'lib/ansi/hexdump.rb', line 87

def dump_random(size=64)
  data = (0..size).map{ rand(255).chr }.join('')
  dump(data)
end

#index? ⇒ Boolean

Returns:

  • (Boolean) 


93
94
95
 
# File 'lib/ansi/hexdump.rb', line 93

def index?
  @index
end

#template ⇒ String (private)

Hex dump line template.

Returns:

  • (String) —

    hex dump line template



102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
 
# File 'lib/ansi/hexdump.rb', line 102

def template
  if color
    Code::CYAN +
    "%s:  " +
    Code::YELLOW +
    "%s " +
    Code::BLUE +
    "|" +
    Code::CLEAR +
    "%s" +
    Code::BLUE +
    "|" +
    Code::CLEAR
  else
    "%s:  %s |%s|"
  end
end