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#encoding: ASCII
require 'barby/barcode'
module Barby
class Code93 < Barcode1D
SHIFT_DOLLAR = "\301" # ($)
SHIFT_PERCENT = "\302" # (%)
SHIFT_SLASH = "\303" # (/)
SHIFT_PLUS = "\304" # (+)
SHIFT_CHARACTERS = [SHIFT_DOLLAR, SHIFT_PERCENT, SHIFT_SLASH, SHIFT_PLUS]
ENCODINGS = {
"0" => "100010100", "1" => "101001000",
"2" => "101000100", "3" => "101000010",
"4" => "100101000", "5" => "100100100",
"6" => "100100010", "7" => "101010000",
"8" => "100010010", "9" => "100001010",
"A" => "110101000", "B" => "110100100",
"C" => "110100010", "D" => "110010100",
"E" => "110010010", "F" => "110001010",
"G" => "101101000", "H" => "101100100",
"I" => "101100010", "J" => "100110100",
"K" => "100011010", "L" => "101011000",
"M" => "101001100", "N" => "101000110",
"O" => "100101100", "P" => "100010110",
"Q" => "110110100", "R" => "110110010",
"S" => "110101100", "T" => "110100110",
"U" => "110010110", "V" => "110011010",
"W" => "101101100", "X" => "101100110",
"Y" => "100110110", "Z" => "100111010",
"-" => "100101110", "." => "111010100",
" " => "111010010", "$" => "111001010",
"/" => "101101110", "+" => "101110110",
"%" => "110101110",
SHIFT_DOLLAR => "100100110",
SHIFT_PERCENT => "111011010",
SHIFT_SLASH => "111010110",
SHIFT_PLUS => "100110010"
}
EXTENDED_MAPPING = {
"\000" => "\302U", " " => " ", "@" => "\302V", "`" => "\302W",
"\001" => "\301A", "!" => "\303A", "A" => "A", "a" => "\304A",
"\002" => "\301B", '"' => "\303B", "B" => "B", "b" => "\304B",
"\003" => "\301C", "#" => "\303C", "C" => "C", "c" => "\304C",
"\004" => "\301D", "$" => "\303D", "D" => "D", "d" => "\304D",
"\005" => "\301E", "%" => "\303E", "E" => "E", "e" => "\304E",
"\006" => "\301F", "&" => "\303F", "F" => "F", "f" => "\304F",
"\007" => "\301G", "'" => "\303G", "G" => "G", "g" => "\304G",
"\010" => "\301H", "(" => "\303H", "H" => "H", "h" => "\304H",
"\011" => "\301I", ")" => "\303I", "I" => "I", "i" => "\304I",
"\012" => "\301J", "*" => "\303J", "J" => "J", "j" => "\304J",
"\013" => "\301K", "/" => "\303K", "K" => "K", "k" => "\304K",
"\014" => "\301L", "," => "\303L", "L" => "L", "l" => "\304L",
"\015" => "\301M", "-" => "-", "M" => "M", "m" => "\304M",
"\016" => "\301N", "." => ".", "N" => "N", "n" => "\304N",
"\017" => "\301O", "+" => "\303O", "O" => "O", "o" => "\304O",
"\020" => "\301P", "0" => "0", "P" => "P", "p" => "\304P",
"\021" => "\301Q", "1" => "1", "Q" => "Q", "q" => "\304Q",
"\022" => "\301R", "2" => "2", "R" => "R", "r" => "\304R",
"\023" => "\301S", "3" => "3", "S" => "S", "s" => "\304S",
"\024" => "\301T", "4" => "4", "T" => "T", "t" => "\304T",
"\025" => "\301U", "5" => "5", "U" => "U", "u" => "\304U",
"\026" => "\301V", "6" => "6", "V" => "V", "v" => "\304V",
"\027" => "\301W", "7" => "7", "W" => "W", "w" => "\304W",
"\030" => "\301X", "8" => "8", "X" => "X", "x" => "\304X",
"\031" => "\301Y", "9" => "9", "Y" => "Y", "y" => "\304Y",
"\032" => "\301Z", ":" => "\303Z", "Z" => "Z", "z" => "\304Z",
"\033" => "\302A", ";" => "\302F", "[" => "\302K", "{" => "\302P",
"\034" => "\302B", "<" => "\302G", "\\" => "\302L", "|" => "\302Q",
"\035" => "\302C", "=" => "\302H", "]" => "\302M", "}" => "\302R",
"\036" => "\302D", ">" => "\302I", "^" => "\302N", "~" => "\302S",
"\037" => "\302E", "?" => "\302J", "_" => "\302O", "\177" => "\302T"
}
EXTENDED_CHARACTERS = EXTENDED_MAPPING.keys - ENCODINGS.keys
CHARACTERS = {
0 => "0", 1 => "1", 2 => "2", 3 => "3",
4 => "4", 5 => "5", 6 => "6", 7 => "7",
8 => "8", 9 => "9", 10 => "A", 11 => "B",
12 => "C", 13 => "D", 14 => "E", 15 => "F",
16 => "G", 17 => "H", 18 => "I", 19 => "J",
20 => "K", 21 => "L", 22 => "M", 23 => "N",
24 => "O", 25 => "P", 26 => "Q", 27 => "R",
28 => "S", 29 => "T", 30 => "U", 31 => "V",
32 => "W", 33 => "X", 34 => "Y", 35 => "Z",
36 => "-", 37 => ".", 38 => " ", 39 => "$",
40 => "/", 41 => "+", 42 => "%",
43 => SHIFT_DOLLAR, 44 => SHIFT_PERCENT,
45 => SHIFT_SLASH, 46 => SHIFT_PLUS
}
VALUES = CHARACTERS.invert
START_ENCODING = '101011110' # *
STOP_ENCODING = '101011110'
TERMINATE_ENCODING = '1'
attr_accessor :data
def initialize(data)
self.data = data
end
def extended?
raw_characters.any?{|c| EXTENDED_CHARACTERS.include?(c) }
end
def raw_characters
data.split(//)
end
def characters
raw_characters.map{|c| EXTENDED_MAPPING[c].split(//) }.flatten
end
def encoded_characters
characters.map{|c| ENCODINGS[c] }
end
alias character_encodings encoded_characters
def start_encoding
START_ENCODING
end
#The stop encoding includes the termination bar
def stop_encoding
STOP_ENCODING+TERMINATE_ENCODING
end
def encoding
start_encoding+data_encoding_with_checksums+stop_encoding
end
def data_encoding
character_encodings.join
end
def data_encoding_with_checksums
(character_encodings + checksum_encodings).join
end
def checksum_encodings
checksum_characters.map{|c| ENCODINGS[c] }
end
def checksum_encoding
checksum_encodings.join
end
def checksums
[c_checksum, k_checksum]
end
def checksum_characters
checksums.map{|s| CHARACTERS[s] }
end
#Returns the values used for computing the C checksum
#in the "right" order (i.e. reversed)
def checksum_values
characters.map{|c| VALUES[c] }.reverse
end
#Returns the normal checksum plus the c_checksum
#This is used for calculating the k_checksum
def checksum_values_with_c_checksum
[c_checksum] + checksum_values
end
#Calculates the C checksum based on checksum_values
def c_checksum
sum = 0
checksum_values.each_with_index do |value, index|
sum += ((index % 20) + 1) * value
end
sum % 47
end
def c_checksum_character
CHARACTERS[c_checksum]
end
def c_checksum_encoding
ENCODINGS[c_checksum_character]
end
#Calculates the K checksum based on checksum_values_with_c_checksum
def k_checksum
sum = 0
checksum_values_with_c_checksum.each_with_index do |value, index|
sum += ((index % 15) + 1) * value
end
sum % 47
end
def k_checksum_character
CHARACTERS[k_checksum]
end
def k_checksum_encoding
ENCODINGS[k_checksum_character]
end
def valid?
characters.all?{|c| ENCODINGS.include?(c) }
end
def to_s
data
end
end
end
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