From e8875a86be332b500c5f42cd66d009eb3641ea27 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Petr=20S=CC=8Ckoda?= <commits@skodak.org>
Date: Sun, 28 Jul 2013 13:10:57 +0200
Subject: [PATCH] MDL-40900 do not use 32bit unsigned integers

32bit PHP and any Windows PHP breaks otherwise.
---
 lib/filestorage/zip_archive.php | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/lib/filestorage/zip_archive.php b/lib/filestorage/zip_archive.php
index 6a5fa6ef353..4304c6ea618 100644
--- a/lib/filestorage/zip_archive.php
+++ b/lib/filestorage/zip_archive.php
@@ -318,10 +318,9 @@ class zip_archive extends file_archive {
         }
         if (substr($fileinfo->pathname, -9) === 'Thumbs.db') {
             $stream = $this->za->getStream($fileinfo->pathname);
-            $info = unpack('Nsiga/Nsigb', fread($stream, 8));
-            $signature = fread($stream, 8);
+            $info = base64_encode(fread($stream, 8));
             fclose($stream);
-            if ($info['siga'] === 0xd0cf11e0 && $info['sigb'] === 0xa1b11ae1) {
+            if ($info === '0M8R4KGxGuE=') {
                 // It's an OLE Compound File - so it's almost certainly a Windows thumbnail cache.
                 return true;
             }