--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/program/lib/Roundcube/rcube_browser.php	Thu Jan 04 15:52:31 2018 -0500
@@ -0,0 +1,69 @@
+<?php
+
+/**
+ +-----------------------------------------------------------------------+
+ | This file is part of the Roundcube Webmail client                     |
+ | Copyright (C) 2007-2015, The Roundcube Dev Team                       |
+ |                                                                       |
+ | Licensed under the GNU General Public License version 3 or            |
+ | any later version with exceptions for skins & plugins.                |
+ | See the README file for a full license statement.                     |
+ |                                                                       |
+ | PURPOSE:                                                              |
+ |   Class representing the client browser's properties                  |
+ +-----------------------------------------------------------------------+
+ | Author: Thomas Bruederli <roundcube@gmail.com>                        |
+ +-----------------------------------------------------------------------+
+*/
+
+/**
+ * Provide details about the client's browser based on the User-Agent header
+ *
+ * @package    Framework
+ * @subpackage Utils
+ */
+class rcube_browser
+{
+    function __construct()
+    {
+        $HTTP_USER_AGENT = strtolower($_SERVER['HTTP_USER_AGENT']);
+
+        $this->ver   = 0;
+        $this->win   = strpos($HTTP_USER_AGENT, 'win') != false;
+        $this->mac   = strpos($HTTP_USER_AGENT, 'mac') != false;
+        $this->linux = strpos($HTTP_USER_AGENT, 'linux') != false;
+        $this->unix  = strpos($HTTP_USER_AGENT, 'unix') != false;
+
+        $this->webkit = strpos($HTTP_USER_AGENT, 'applewebkit') !== false;
+        $this->opera  = strpos($HTTP_USER_AGENT, 'opera') !== false || ($this->webkit && strpos($HTTP_USER_AGENT, 'opr/') !== false);
+        $this->ns     = strpos($HTTP_USER_AGENT, 'netscape') !== false;
+        $this->chrome = !$this->opera && strpos($HTTP_USER_AGENT, 'chrome') !== false;
+        $this->ie     = !$this->opera && (strpos($HTTP_USER_AGENT, 'compatible; msie') !== false || strpos($HTTP_USER_AGENT, 'trident/') !== false);
+        $this->safari = !$this->opera && !$this->chrome && ($this->webkit || strpos($HTTP_USER_AGENT, 'safari') !== false);
+        $this->mz     = !$this->ie && !$this->safari && !$this->chrome && !$this->ns && !$this->opera && strpos($HTTP_USER_AGENT, 'mozilla') !== false;
+
+        if ($this->opera) {
+            if (preg_match('/(opera|opr)\/([0-9.]+)/', $HTTP_USER_AGENT, $regs)) {
+                $this->ver = (float) $regs[2];
+            }
+        }
+        else if (preg_match('/(chrome|msie|version|khtml)(\s*|\/)([0-9.]+)/', $HTTP_USER_AGENT, $regs)) {
+            $this->ver = (float) $regs[3];
+        }
+        else if (preg_match('/rv:([0-9.]+)/', $HTTP_USER_AGENT, $regs)) {
+            $this->ver = (float) $regs[1];
+        }
+
+        if (preg_match('/ ([a-z]{2})-([a-z]{2})/', $HTTP_USER_AGENT, $regs)) {
+            $this->lang =  $regs[1];
+        }
+        else {
+            $this->lang =  'en';
+        }
+
+        $this->dom      = $this->mz || $this->safari || ($this->ie && $this->ver>=5) || ($this->opera && $this->ver>=7);
+        $this->pngalpha = $this->mz || $this->safari || ($this->ie && $this->ver>=5.5) ||
+            ($this->ie && $this->ver>=5 && $this->mac) || ($this->opera && $this->ver>=7);
+        $this->imgdata  = !$this->ie;
+    }
+}