class RubyXL::GenericStorage

def load_dir(root_dir)
  dirpath = File.join(root_dir, @local_dir_path)
  if File.directory?(dirpath) then
    (Dir.new(dirpath).entries - ['.', '..', '.DS_Store', '_rels']).each { |filename|
      self[filename] = File.open(File.join(dirpath, filename), @mode).read
    }
  end
  self
end