# File lib/action_view/helpers/number_helper.rb, line 258
      def number_to_human_size(number, *args)
        return nil if number.nil?

        options = args.extract_options!
        options.symbolize_keys!

        defaults = I18n.translate('number.format''number.format', :locale => options[:locale], :raise => true) rescue {}
        human    = I18n.translate('number.human.format''number.human.format', :locale => options[:locale], :raise => true) rescue {}
        defaults = defaults.merge(human)

        unless args.empty?
          ActiveSupport::Deprecation.warn('number_to_human_size takes an option hash ' +
            'instead of a separate precision argument.', caller)
          precision = args[0] || defaults[:precision]
        end

        precision ||= (options[:precision] || defaults[:precision])
        separator ||= (options[:separator] || defaults[:separator])
        delimiter ||= (options[:delimiter] || defaults[:delimiter])

        storage_units_format = I18n.translate('number.human.storage_units.format''number.human.storage_units.format', :locale => options[:locale], :raise => true)

        if number.to_i < 1024
          unit = I18n.translate('number.human.storage_units.units.byte''number.human.storage_units.units.byte', :locale => options[:locale], :count => number.to_i, :raise => true)
          storage_units_format.gsub(/%n/, number.to_i.to_s).gsub(/%u/, unit)
        else
          max_exp  = STORAGE_UNITS.size - 1
          number   = Float(number)
          exponent = (Math.log(number) / Math.log(1024)).to_i # Convert to base 1024
          exponent = max_exp if exponent > max_exp # we need this to avoid overflow for the highest unit
          number  /= 1024 ** exponent

          unit_key = STORAGE_UNITS[exponent]
          unit = I18n.translate("number.human.storage_units.units.#{unit_key}""number.human.storage_units.units.#{unit_key}", :locale => options[:locale], :count => number, :raise => true)

          begin
            escaped_separator = Regexp.escape(separator)
            formatted_number = number_with_precision(number,
              :precision => precision,
              :separator => separator,
              :delimiter => delimiter
            ).sub(/(#{escaped_separator})(\d*[1-9])?0+\z/, '\1\2').sub(/#{escaped_separator}\z/, '')
            storage_units_format.gsub(/%n/, formatted_number).gsub(/%u/, unit)
          rescue
            number
          end
        end
      end