Contents

module CryptoconditionsRuby
  module Utils
    class Base58
      CHARS = %w(123456789 ABCDEFGHJKLMNPQRSTUVWXYZ abcdefghijkmnopqrstuvwxyz).freeze

      def self.decoding_table
        @decoding_table ||= generate_decoding_table
      end

      def self.generate_decoding_table
        CHARS.join.split('').each_with_index.each_with_object({}) do |(c, i), store|
          store[c] = i
        end
      end

      def self.encoding_table
        @encoding_table ||= decoding_table.invert
      end

      def self.encode(data)
        cdata = data.unpack('C*')
        vlong = cdata.inject(0) { |store, v| v + store * 256 }
        result = ''
        while vlong > 0
          result += encoding_table[vlong % 58]
          vlong /= 58
        end
        while cdata.first.zero?
          result += '1'
          cdata = cdata[1..-1]
        end
        result.reverse
      end

      def self.decode(data_string)
        vlong = data_string.each_byte.inject(0) do |store, b|
          store = decoding_table[b.chr] + (58 * store)
          store
        end
        result = ''
        while vlong > 0
          result += (vlong % 256).chr
          vlong /= 256
        end
        while data_string[0] == '1'
          result += "\x00"
          data_string = data_string[1..-1]
        end
        result.reverse
      end
    end
  end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
cryptoconditions_ruby-0.5.2	lib/cryptoconditions_ruby/utils/base58.rb
cryptoconditions_ruby-0.5.1	lib/cryptoconditions_ruby/utils/base58.rb