Class: Barcodes::Symbology::Code39Mod43

Inherits:
Code39
  • Object
show all
Defined in:
lib/barcodes/symbology/code39mod43.rb

Overview

Modulo 43 checksum version of Code 39

More info: en.wikipedia.org/wiki/Code_39

Instance Attribute Summary

Attributes inherited from Base

#alpha, #bar_height, #bar_width, #caption_height, #caption_size, #captioned, #color, #data

Instance Method Summary collapse

Methods inherited from Code39

charset, #initialize, valueset

Methods inherited from Base

charset, #encoded_data, #height, #initialize, #quiet_zone_width, #valid?, valueset, #width

Constructor Details

This class inherits a constructor from Barcodes::Symbology::Code39

Instance Method Details

#caption_data ⇒ Object

Returns caption data without checksum



18
19
20
 
# File 'lib/barcodes/symbology/code39mod43.rb', line 18

def caption_data
  @start_character + @data + @stop_character
end

#checksum ⇒ Object

Calculates the checksum using the provided data



31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
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
84
 
# File 'lib/barcodes/symbology/code39mod43.rb', line 31

def checksum
  if self.valid?
    sum = 0
    self.data.each_char do |char|
      if ('0'..'9').include? char
        sum += char.to_i
      elsif ('A'..'Z').include? char
        sum += ('A'..'Z').to_a.index(char) + 10
      else
        case char
        when '-'
          sum += 36
        when '.'
          sum += 37
        when ' '
          sum += 38
        when '$'
          sum += 39
        when '/'
          sum += 40
        when '+'
          sum += 41
        when '%'
          sum += 42
        end
      end
    end

    value = sum % 43

    if (0..9).include? value
      return value.to_s
    elsif value >= 10 && value < 36
      return ('A'..'Z').to_a.fetch(value - 10)
    else
      case value
      when 36
        return '-'
      when 37
        return '.'
      when 38
        return ' '
      when 39
        return '$'
      when 40
        return '/'
      when 41
        return '+'
      when 42
        return '%'
      end
    end
  end
end

#formatted_data ⇒ Object

Start character + data + checksum + stop character



23
24
25
26
27
28
 
# File 'lib/barcodes/symbology/code39mod43.rb', line 23

def formatted_data
  checksum = self.checksum
  unless checksum.nil?
    @start_character + @data + checksum + @stop_character
  end
end