From 2df074a79649c4a61746513df5ec85e97a063e81 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jacob=20Mu=CC=88ller?= <j.mueller@mister-bk.de>
Date: Tue, 7 Jun 2016 14:05:11 +0200
Subject: [PATCH] Make sure stream is seeable before using `rewind`

---
 src/Server.php | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/Server.php b/src/Server.php
index 05f1c9fd..a979c1d4 100644
--- a/src/Server.php
+++ b/src/Server.php
@@ -439,7 +439,9 @@ public function outputImage($path, array $params)
 
         $stream = $this->cache->readStream($path);
 
-        rewind($stream);
+        if (ftell($stream) !== 0) {
+            rewind($stream);
+        }
         fpassthru($stream);
         fclose($stream);
     }