hirura/hrr_rb_ssh

module HrrRbSsh
  class DataTypes
    # Uint32 provides methods to convert integer value and 32-bit unsigned binary string each other.
    class Uint32 < DataTypes
      # Convert integer value into 32-bit unsigned binary string.
      #
      # @param [::Integer] arg integer value to be converted
      # @raise [::ArgumentError] when arg is not between 0x0000_0000 and 0xffff_ffff
      # @return [::String] converted 32-bit unsigned binary string
      def self.encode arg
        case arg
        when 0x0000_0000..0xffff_ffff
          [arg].pack("N")
        else
          raise ArgumentError, "must be in #{0x0000_0000}..#{0xffff_ffff}, but got #{arg.inspect}"
        end
      end

      # Convert 32-bit unsigned binary into Integer value.
      #
      # @param [::IO] io IO instance that has buffer to be read
      # @return [::Integer] converted integer value
      def self.decode io
        io.read(4).unpack("N")[0]
      end
    end
  end
end