Code hulk text decoder http://codehulk.lunarlogicpolska.com

code_hulk.rb

class CodeHulk
  def self.decode(encoded_text)
		decoded_text = ''
		text = encoded_text
		text = text.gsub(@@start_encoded_text, '')
		text = text.gsub(@@end_encoded_text, '')
 
		text.split('').each do |c|
			if(@@dictionary.include?(c))
				decoded_text << @@dictionary[c]
			else
				decoded_text << c
			end
		end

		return decoded_text
	end
 
	private
	@@start_encoded_text = "==BEGIN-ENCODED-MESSAGE=="
	@@end_encoded_text = "==END-ENCODED-MESSAGE=="
 
	@@dictionary = { 
		's'	=>	'a',
		'W'	=>	'b',
		'3'	=>	'B',
		'U'	=>	'c',
		't'	=>	'C',
		'v'	=>	'd',
		'0'	=>	'D',
		'E'	=>	'e',
		'b'	=>	'E',
		'm'	=>	'f',
		'1'	=>	'g',
		'n'	=>	'G',
		'?'	=>	'h',
		'B'	=>	'H',
		'J'	=>	'i',
		'w' =>	'I',
		'I'	=>	'k',
		'8'	=>	'l',
		'd'	=>	'm',
		'y'	=>	'M',
		'r'	=>	'n',
		'R'	=>	'o',
		'o'	=>	'p',
		'H'	=>	'q',
		'x'	=>	'r',
		'K'	=>	'R',
		'a'	=>	's',
		'O'	=>	'S',
		'2'	=>	't',
		'!'	=>	'T',
		'4'	=>	'u',
		'l'	=>	'v',
		'6'	=>	'y',
		'S'	=>	'Y',
		'F'	=>	'z',
 
		'A'	=>	'-',
		'D'	=>	'.',
		':'	=>	':',
		'9'	=>	'?',
		'7'	=>	' ',
		'h'	=>	'!',
		','	=>	',',
 
		'-'	=>	'0',
		'j'	=>	'1',
		'N'	=>	'2',
		'M'	=>	'3',
		'i'	=>	'4',
		'.'	=>	'5',
		'C'	=>	'6',
		'f'	=>	'7',
		'G'	=>	'8',
		'X'	=>	'9',
	}
end
 
file_to_read = ARGV[0]
 
if(File.exists?(file_to_read))
	text = File.open(file_to_read).read

	puts "Encoded Text:\n"
	puts text
 
	puts "Decoded text:\n"
	puts CodeHulk.decode(text)
else
	puts 'Error need a valid file'
end