add piwik installation

www/analytics/core/Unzip/UncompressInterface.php

@@ -0,0 +1,39 @@
+<?php
+/**
+ * Piwik - Open source web analytics
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ *
+ */
+
+namespace Piwik\Unzip;
+
+/**
+ * Unzip interface
+ *
+ */
+interface UncompressInterface
+{
+    /**
+     * Constructor
+     *
+     * @param string $filename Name of the .zip archive
+     */
+    public function __construct($filename);
+
+    /**
+     * Extract files from archive to target directory
+     *
+     * @param string $pathExtracted Absolute path of target directory
+     * @return mixed  Array of filenames if successful; or 0 if an error occurred
+     */
+    public function extract($pathExtracted);
+
+    /**
+     * Get error status string for the latest error
+     *
+     * @return string
+     */
+    public function errorInfo();
+}