whole_func_string: function addFile(filename) {
      var file = zip.addFile(filename);
      var sha = new SHAWriteStream(manifest, filename, file);
      return sha;
    }
func_code_string: function addFile(filename) {
      var file = zip.addFile(filename);
      var sha = new SHAWriteStream(manifest, filename, file);
      return sha;
    }
func_documentation_string: Add file to zip and it's SHA to manifest