--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cms/drupal/includes/archiver.inc	Fri Sep 08 12:04:06 2017 +0200
@@ -0,0 +1,68 @@
+<?php
+
+/**
+ * @file
+ * Shared classes and interfaces for the archiver system.
+ */
+
+/**
+ * Defines the common interface for all Archiver classes.
+ */
+interface ArchiverInterface {
+
+  /**
+   * Constructs a new archiver instance.
+   *
+   * @param $file_path
+   *   The full system path of the archive to manipulate. Only local files
+   *   are supported. If the file does not yet exist, it will be created if
+   *   appropriate.
+   */
+  public function __construct($file_path);
+
+  /**
+   * Adds the specified file or directory to the archive.
+   *
+   * @param $file_path
+   *   The full system path of the file or directory to add. Only local files
+   *   and directories are supported.
+   *
+   * @return ArchiverInterface
+   *   The called object.
+   */
+  public function add($file_path);
+
+  /**
+   * Removes the specified file from the archive.
+   *
+   * @param $path
+   *   The file name relative to the root of the archive to remove.
+   *
+   * @return ArchiverInterface
+   *   The called object.
+   */
+  public function remove($path);
+
+  /**
+   * Extracts multiple files in the archive to the specified path.
+   *
+   * @param $path
+   *   A full system path of the directory to which to extract files.
+   * @param $files
+   *   Optionally specify a list of files to be extracted. Files are
+   *   relative to the root of the archive. If not specified, all files
+   *   in the archive will be extracted.
+   *
+   * @return ArchiverInterface
+   *   The called object.
+   */
+  public function extract($path, array $files = array());
+
+  /**
+   * Lists all files in the archive.
+   *
+   * @return
+   *   An array of file names relative to the root of the archive.
+   */
+  public function listContents();
+}