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diff --git a/vendor/symfony/http-foundation/File/MimeType/ExtensionGuesser.php b/vendor/symfony/http-foundation/File/MimeType/ExtensionGuesser.php
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index 000000000..921751f6b
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+++ b/vendor/symfony/http-foundation/File/MimeType/ExtensionGuesser.php
@@ -0,0 +1,96 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpFoundation\File\MimeType;
+
+/**
+ * A singleton mime type to file extension guesser.
+ *
+ * A default guesser is provided.
+ * You can register custom guessers by calling the register()
+ * method on the singleton instance:
+ *
+ *     $guesser = ExtensionGuesser::getInstance();
+ *     $guesser->register(new MyCustomExtensionGuesser());
+ *
+ * The last registered guesser is preferred over previously registered ones.
+ */
+class ExtensionGuesser implements ExtensionGuesserInterface
+{
+    /**
+     * The singleton instance.
+     *
+     * @var ExtensionGuesser
+     */
+    private static $instance = null;
+
+    /**
+     * All registered ExtensionGuesserInterface instances.
+     *
+     * @var array
+     */
+    protected $guessers = array();
+
+    /**
+     * Returns the singleton instance.
+     *
+     * @return self
+     */
+    public static function getInstance()
+    {
+        if (null === self::$instance) {
+            self::$instance = new self();
+        }
+
+        return self::$instance;
+    }
+
+    /**
+     * Registers all natively provided extension guessers.
+     */
+    private function __construct()
+    {
+        $this->register(new MimeTypeExtensionGuesser());
+    }
+
+    /**
+     * Registers a new extension guesser.
+     *
+     * When guessing, this guesser is preferred over previously registered ones.
+     *
+     * @param ExtensionGuesserInterface $guesser
+     */
+    public function register(ExtensionGuesserInterface $guesser)
+    {
+        array_unshift($this->guessers, $guesser);
+    }
+
+    /**
+     * Tries to guess the extension.
+     *
+     * The mime type is passed to each registered mime type guesser in reverse order
+     * of their registration (last registered is queried first). Once a guesser
+     * returns a value that is not NULL, this method terminates and returns the
+     * value.
+     *
+     * @param string $mimeType The mime type
+     *
+     * @return string The guessed extension or NULL, if none could be guessed
+     */
+    public function guess($mimeType)
+    {
+        foreach ($this->guessers as $guesser) {
+            if (null !== $extension = $guesser->guess($mimeType)) {
+                return $extension;
+            }
+        }
+    }
+}