Class: QRCode::Encoder::ErrorCorrectionBlock

Inherits:
Object
  • Object
show all
Defined in:
lib/qrcode/encoder/error_correction_block.rb

Constant Summary collapse

TABLE =

www.thonky.com/qr-code-tutorial/error-correction-table/ Table of [block_count, total_codewords, data_codewords] for each version and error level

[
  # The order within each group is:
  # L
  # M
  # Q
  # H
  
  # 1
  [1, 26, 19],
  [1, 26, 16],
  [1, 26, 13],
  [1, 26, 9],
  
  # 2
  [1, 44, 34],
  [1, 44, 28],
  [1, 44, 22],
  [1, 44, 16],
  
  # 3
  [1, 70, 55],
  [1, 70, 44],
  [2, 35, 17],
  [2, 35, 13],
  
  # 4
  [1, 100, 80],
  [2, 50, 32],
  [2, 50, 24],
  [4, 25, 9],
  
  # 5
  [1, 134, 108],
  [2, 67, 43],
  [2, 33, 15, 2, 34, 16],
  [2, 33, 11, 2, 34, 12],
  
  # 6
  [2, 86, 68],
  [4, 43, 27],
  [4, 43, 19],
  [4, 43, 15],
  
  # 7
  [2, 98, 78],
  [4, 49, 31],
  [2, 32, 14, 4, 33, 15],
  [4, 39, 13, 1, 40, 14],
  
  # 8
  [2, 121, 97],
  [2, 60, 38, 2, 61, 39],
  [4, 40, 18, 2, 41, 19],
  [4, 40, 14, 2, 41, 15],
  
  # 9
  [2, 146, 116],
  [3, 58, 36, 2, 59, 37],
  [4, 36, 16, 4, 37, 17],
  [4, 36, 12, 4, 37, 13],
  
  # 10
  [2, 86, 68, 2, 87, 69],
  [4, 69, 43, 1, 70, 44],
  [6, 43, 19, 2, 44, 20],
  [6, 43, 15, 2, 44, 16],
  
  # 11
  [4, 101, 81],
  [1, 80, 50, 4, 81, 51],
  [4, 50, 22, 4, 51, 23],
  [3, 36, 12, 8, 37, 13],
  
  # 12
  [2, 116, 92, 2, 117, 93],
  [6, 58, 36, 2, 59, 37],
  [4, 46, 20, 6, 47, 21],
  [7, 42, 14, 4, 43, 15],
  
  # 13
  [4, 133, 107],
  [8, 59, 37, 1, 60, 38],
  [8, 44, 20, 4, 45, 21],
  [12, 33, 11, 4, 34, 12],
  
  # 14
  [3, 145, 115, 1, 146, 116],
  [4, 64, 40, 5, 65, 41],
  [11, 36, 16, 5, 37, 17],
  [11, 36, 12, 5, 37, 13],
  
  # 15
  [5, 109, 87, 1, 110, 88],
  [5, 65, 41, 5, 66, 42],
  [5, 54, 24, 7, 55, 25],
  [11, 36, 12, 7, 37, 13],
  
  # 16
  [5, 122, 98, 1, 123, 99],
  [7, 73, 45, 3, 74, 46],
  [15, 43, 19, 2, 44, 20],
  [3, 45, 15, 13, 46, 16],
  
  # 17
  [1, 135, 107, 5, 136, 108],
  [10, 74, 46, 1, 75, 47],
  [1, 50, 22, 15, 51, 23],
  [2, 42, 14, 17, 43, 15],
  
  # 18
  [5, 150, 120, 1, 151, 121],
  [9, 69, 43, 4, 70, 44],
  [17, 50, 22, 1, 51, 23],
  [2, 42, 14, 19, 43, 15],
  
  # 19
  [3, 141, 113, 4, 142, 114],
  [3, 70, 44, 11, 71, 45],
  [17, 47, 21, 4, 48, 22],
  [9, 39, 13, 16, 40, 14],
  
  # 20
  [3, 135, 107, 5, 136, 108],
  [3, 67, 41, 13, 68, 42],
  [15, 54, 24, 5, 55, 25],
  [15, 43, 15, 10, 44, 16],
  
  # 21
  [4, 144, 116, 4, 145, 117],
  [17, 68, 42],
  [17, 50, 22, 6, 51, 23],
  [19, 46, 16, 6, 47, 17],
  
  # 22
  [2, 139, 111, 7, 140, 112],
  [17, 74, 46],
  [7, 54, 24, 16, 55, 25],
  [34, 37, 13],
  
  # 23
  [4, 151, 121, 5, 152, 122],
  [4, 75, 47, 14, 76, 48],
  [11, 54, 24, 14, 55, 25],
  [16, 45, 15, 14, 46, 16],
  
  # 24
  [6, 147, 117, 4, 148, 118],
  [6, 73, 45, 14, 74, 46],
  [11, 54, 24, 16, 55, 25],
  [30, 46, 16, 2, 47, 17],
  
  # 25
  [8, 132, 106, 4, 133, 107],
  [8, 75, 47, 13, 76, 48],
  [7, 54, 24, 22, 55, 25],
  [22, 45, 15, 13, 46, 16],
  
  # 26
  [10, 142, 114, 2, 143, 115],
  [19, 74, 46, 4, 75, 47],
  [28, 50, 22, 6, 51, 23],
  [33, 46, 16, 4, 47, 17],
  
  # 27
  [8, 152, 122, 4, 153, 123],
  [22, 73, 45, 3, 74, 46],
  [8, 53, 23, 26, 54, 24],
  [12, 45, 15, 28, 46, 16],
  
  # 28
  [3, 147, 117, 10, 148, 118],
  [3, 73, 45, 23, 74, 46],
  [4, 54, 24, 31, 55, 25],
  [11, 45, 15, 31, 46, 16],
  
  # 29
  [7, 146, 116, 7, 147, 117],
  [21, 73, 45, 7, 74, 46],
  [1, 53, 23, 37, 54, 24],
  [19, 45, 15, 26, 46, 16],
  
  # 30
  [5, 145, 115, 10, 146, 116],
  [19, 75, 47, 10, 76, 48],
  [15, 54, 24, 25, 55, 25],
  [23, 45, 15, 25, 46, 16],
  
  # 31
  [13, 145, 115, 3, 146, 116],
  [2, 74, 46, 29, 75, 47],
  [42, 54, 24, 1, 55, 25],
  [23, 45, 15, 28, 46, 16],
  
  # 32
  [17, 145, 115],
  [10, 74, 46, 23, 75, 47],
  [10, 54, 24, 35, 55, 25],
  [19, 45, 15, 35, 46, 16],
  
  # 33
  [17, 145, 115, 1, 146, 116],
  [14, 74, 46, 21, 75, 47],
  [29, 54, 24, 19, 55, 25],
  [11, 45, 15, 46, 46, 16],
  
  # 34
  [13, 145, 115, 6, 146, 116],
  [14, 74, 46, 23, 75, 47],
  [44, 54, 24, 7, 55, 25],
  [59, 46, 16, 1, 47, 17],
  
  # 35
  [12, 151, 121, 7, 152, 122],
  [12, 75, 47, 26, 76, 48],
  [39, 54, 24, 14, 55, 25],
  [22, 45, 15, 41, 46, 16],
  
  # 36
  [6, 151, 121, 14, 152, 122],
  [6, 75, 47, 34, 76, 48],
  [46, 54, 24, 10, 55, 25],
  [2, 45, 15, 64, 46, 16],
  
  # 37
  [17, 152, 122, 4, 153, 123],
  [29, 74, 46, 14, 75, 47],
  [49, 54, 24, 10, 55, 25],
  [24, 45, 15, 46, 46, 16],
  
  # 38
  [4, 152, 122, 18, 153, 123],
  [13, 74, 46, 32, 75, 47],
  [48, 54, 24, 14, 55, 25],
  [42, 45, 15, 32, 46, 16],
  
  # 39
  [20, 147, 117, 4, 148, 118],
  [40, 75, 47, 7, 76, 48],
  [43, 54, 24, 22, 55, 25],
  [10, 45, 15, 67, 46, 16],
  
  # 40
  [19, 148, 118, 6, 149, 119],
  [18, 75, 47, 31, 76, 48],
  [34, 54, 24, 34, 55, 25],
  [20, 45, 15, 61, 46, 16]
].freeze

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(total_count, data_count) ⇒ ErrorCorrectionBlock

Returns a new instance of ErrorCorrectionBlock.



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# File 'lib/qrcode/encoder/error_correction_block.rb', line 16

def initialize(total_count, data_count)
  @total_count = total_count
  @data_count = data_count
end

Instance Attribute Details

#data_count ⇒ Object (readonly)

Returns the value of attribute data_count.



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# File 'lib/qrcode/encoder/error_correction_block.rb', line 14

def data_count
  @data_count
end

#total_count ⇒ Object (readonly)

Returns the value of attribute total_count.



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# File 'lib/qrcode/encoder/error_correction_block.rb', line 14

def total_count
  @total_count
end

Class Method Details

.for(version, level) ⇒ Array<ErrorCorrectionBlock>

Create error correction blocks for given version and level

Returns:



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# File 'lib/qrcode/encoder/error_correction_block.rb', line 275

def self.for(version, level)
  entry = table_entry_for(version, level)
  
  if entry.nil?
    raise RuntimeError, "Invalid error correction configuration: version=#{version}, level=#{level}"
  end
  
  blocks = []
  groups = entry.size / 3
  
  (0...groups).each do |i|
    count = entry[i * 3 + 0]
    total_count = entry[i * 3 + 1]
    data_count = entry[i * 3 + 2]
    
    count.times do
      blocks << ErrorCorrectionBlock.new(total_count, data_count)
    end
  end
  
  blocks
end

.table_entry_for(version, level) ⇒ Array

Get table entry for specific version and error correction level

Returns:

  • (Array) —

    Table entry [block_count, total_codewords, data_codewords, …]



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# File 'lib/qrcode/encoder/error_correction_block.rb', line 302

def self.table_entry_for(version, level)
  return nil unless version.between?(1, 40)
  
  case level
  when ERROR_CORRECTION_LEVEL[:l]
    TABLE[(version - 1) * 4 + 0]
  when ERROR_CORRECTION_LEVEL[:m]
    TABLE[(version - 1) * 4 + 1]
  when ERROR_CORRECTION_LEVEL[:q]
    TABLE[(version - 1) * 4 + 2]
  when ERROR_CORRECTION_LEVEL[:h]
    TABLE[(version - 1) * 4 + 3]
  end
end