Calculate the size of Base64.encode64 (strict or not) in Ruby

calculate_base64_size.rb

    def calculate_base64_size(size, strict: false)
      # see http://stackoverflow.com/questions/13378815/base64-length-calculation for more details about this calculation
      code_size = (size * 4) / 3

      # Adds padding (0, 1 or 2 '=') depending on the size
      padding = size % 3 ? (3 - (size % 3)) : 0

      # sum plus terminating null character
      padded_size = code_size + padding + 1
      # The RFC 2045 states that 'the encoded output stream must be represented in lines of no more than 76 characters
      # each', so every implementation is free to choose a number lower than 76 chars. Ruby stdlib for example does it
      # every 60 chars, feel free to change it to another number depending on the implementation of base64.
      newline_size = strict ? 0 : (padded_size / 60.0).ceil

      padded_size + newline_size
    end