Revert "MDL-35380 SCORM: improve check for imsmanifest file and consolidate into a single function."

This reverts commit 492407e9f7.

mod/scorm/lib.php

@@ -1271,10 +1271,32 @@ function scorm_dndupload_handle($uploadinfo) {
     $file = reset($files);
 
     // Validate the file, make sure it's a valid SCORM package!
-    $errors = scorm_validate_package($file);
-    if (!empty($errors)) {
+    $packer = get_file_packer('application/zip');
+    $filelist = $file->list_files($packer);
+
+    if (!is_array($filelist)) {
         return false;
+    } else {
+        $manifestpresent = false;
+        $aiccfound = false;
+
+        foreach ($filelist as $info) {
+            if ($info->pathname == 'imsmanifest.xml') {
+                $manifestpresent = true;
+                break;
+            }
+
+            if (preg_match('/\.cst$/', $info->pathname)) {
+                $aiccfound = true;
+                break;
+            }
+        }
+
+        if (!$manifestpresent && !$aiccfound) {
+            return false;
+        }
     }
+
     // Create a default scorm object to pass to scorm_add_instance()!
     $scorm = get_config('scorm');
     $scorm->course = $uploadinfo->course->id;