gistfile1.rb

  def self.native_id_to_int(native_id)
    alpha = "-ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
    res = ""
    i = 0
    native_id.split(//).each do |c| 
      if ((i+=1) <= 4) && alpha.include?(c.to_s)
        index = alpha.index(c) + 10 
        res += index.to_s
      else
        res += c
      end
    end
    res
  end
  
  def self.id_to_native_id(id)
    id = id.to_s
    alpha = "-ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
    res = ""
    i = id[0,2].to_i - 10
    res += alpha[i,1]
    i = id[2,2].to_i - 10
    res += alpha[i,1]
    i = id[4,2].to_i - 10
    res += alpha[i,1]
    i = id[6,2].to_i - 10
    res += alpha[i,1]
  
    res += id[8,(id.length-8)]
  end