add_file_simple

# File lib/rubygems/package/tar_writer.rb, line 135
  def add_file_simple(name, mode, size) # :yields: io
    check_closed

    name, prefix = split_name name

    header = Gem::Package::TarHeader.new(:name => name, :mode => mode,
                                         :size => size, :prefix => prefix).to_s

    @io.write header
    os = BoundedStream.new @io, size

    yield os if block_given?

    min_padding = size - os.written
    @io.write("\00"" * min_padding)

    remainder = (512 - (size % 512)) % 512
    @io.write("\00"" * remainder)

    self
  end