code: def each(&b)
        raise IOError, 'non-readable archive' unless readable?
        raise IOError, 'closed archive' if closed?
  
        unless @parse_complete then
          parse(@archive)
          @parse_complete = true
        end
        @entries.each(&b)
      end
docs: Iterates through each entry of a readable ZIP archive in turn yielding
   each one to the given block.
  
   Raises Archive::Zip::IOError if called on a non-readable archive or after
   the archive is closed.