Attach the native entry struct to the ArchiveEntry object.

utils/archive/reader.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #library("reader");
 
 #import("input_stream.dart");
 #import("options.dart");
 #import("read_request.dart");
 #import("utils.dart");
@@ skipping 59 matching lines @@
       id = _id;
       return call(OPEN_MEMORY, id, [bytesForC(data)]);
     }).transform((_) => new ArchiveInputStream(id));
   }
 
   /**
    * Creates an archive struct, applies all the configuration options to it, and
    * returns its id.
    */
   Future<int> _createArchive() {
-    return call(NEW, null).chain((id) {
+    return call(NEW).chain((id) {
       if (id == 0 || id == null) {
         throw new ArchiveException("Archive is invalid or closed.");
       }
       return _pushConfiguration(id).transform((_) => id);
     });
   }
 
   /**
    * Applies all configuration in this archive to the archive identified by
    * [id]. Returns a future that completes once all the configuration is
@@ skipping 188 matching lines @@
   /**
    * Options for individual formats. See [the libarchive documentation][wiki]
    * for a list of available options.
    *
    * [wiki]: https://github.com/libarchive/libarchive/wiki/ManPageArchiveReadSetOptions3
    */
   final ArchiveOptions options;
 
   Format._() : options = new ArchiveOptions();
 }