symfony · nicolas-grekas · Sep 13, 2024 · Sep 11, 2024
diff --git a/src/Symfony/Component/Mime/FileinfoMimeTypeGuesser.php b/src/Symfony/Component/Mime/FileinfoMimeTypeGuesser.php
@@ -13,6 +13,7 @@

 use Symfony\Component\Mime\Exception\InvalidArgumentException;
 use Symfony\Component\Mime\Exception\LogicException;
+use Symfony\Component\Mime\Exception\RuntimeException;

 /**
 * Guesses the MIME type using the PECL extension FileInfo.
@@ -21,6 +22,11 @@
 */
 class FileinfoMimeTypeGuesser implements MimeTypeGuesserInterface
 {
+    /**
+     * @var array<string, \finfo>
+     */
+    private static $finfoCache = [];
+
    /**
     * @param string|null $magicFile A magic file to use with the finfo instance
     *
@@ -46,10 +52,12 @@ public function guessMimeType(string $path): ?string
            throw new LogicException(\sprintf('The "%s" guesser is not supported.', __CLASS__));
        }

-        if (false === $finfo = new \finfo(\FILEINFO_MIME_TYPE, $this->magicFile)) {
-            return null;
+        try {
+            $finfo = self::$finfoCache[$this->magicFile] ??= new \finfo(\FILEINFO_MIME_TYPE, $this->magicFile);
+        } catch (\Exception $e) {
+            throw new RuntimeException($e->getMessage());
        }
-        $mimeType = $finfo->file($path);
+        $mimeType = $finfo->file($path) ?: null;

        if ($mimeType && 0 === (\strlen($mimeType) % 2)) {
            $mimeStart = substr($mimeType, 0, \strlen($mimeType) >> 1);