improve snapshot description file parse

lib/DirScanner.php

@@ -84,8 +84,8 @@ Class DirScanner {
         if (in_array($field, ['title', 'snapshot'])) {
             $content = preg_replace('/\s/', '', $content);
             if ($field == 'snapshot') {
-                $img_realpath = str_replace("{$pathinfo['filename']}.{$pathinfo['extension']}", $content, $realpath);
-                echo "img_realpath: ".$img_realpath."\n";
+                $img_realpath = "{$pathinfo['dirname']}/{$content}";
+                if (file_exists($img_realpath)) {
                     $id = $this->getId($img_realpath);
                     $fp = fopen($img_realpath, 'r');
                     $fstat = fstat($fp);
@@ -95,6 +95,7 @@ Class DirScanner {
                     $content = $this->getFilePath( $id, $this->getDirectoryName($img_pathinfo['dirname'], $dirLevel), $img_pathinfo['filename'], $extension, $fstat['mtime'] );
                 }
             }
+        }
         $data[$field] = $content;
 
         return $data;