code: def compress(entries)
              puts "\nadding the following entries into zip package"
              puts "#{ entries.map{ |x| x.name }.join("\n")}"
              buffer = Zip::File.add_buffer do |zio|
                  entries.each do |file|
                      if file.is_a? FileEntry
                          zio.add(file.path == nil ? file.name : file.path, file.name)
                      else
                          zio.get_output_stream(file.name) { |os| os.write file.buffer.string }
                      end
                  end
              end
          end
docs: Creates zip file in memory from passed +FileEntry+ array, returns StringIO as result
   Params:
   +entries+:: array of +FileEntry+ and +ZipEntry+ objects