add function in filesystem to strip webroot

lib/filesystem.php

@@ -341,6 +341,20 @@ class OC_Filesystem{
 		return self::$defaultInstance->getLocalFile($path);
 	}
 	
+	/**
+	* return path to file which reflects one visible in browser
+	* @param string path
+	* @return string
+	*/
+	static public function getLocalPath($path) {
+		$datadir = \OCP\Config::getSystemValue('datadirectory').'/'.\OC_User::getUser().'/files';
+		$newpath = $path;
+		if (strncmp($newpath, $datadir, strlen($datadir)) == 0) {
+			$newpath = substr($path, strlen($datadir));
+		}
+		return $newpath;
+	}
+	
 	/**
 	 * check if the requested path is valid
 	 * @param string path

lib/image.php

@@ -402,12 +402,7 @@ class OC_Image {
 			default:
 			
 				// this is mostly file created from encrypted file
-				$datadir = \OCP\Config::getSystemValue('datadirectory').'/'.\OC_User::getUser().'/files';
-				$newimgpath = $imagepath;
-				if (strncmp($newimgpath, $datadir, strlen($datadir)) == 0) {
-					$newimgpath = substr($imagepath, strlen($datadir));
-				}
-				$this->resource = imagecreatefromstring(\OC_Filesystem::file_get_contents($newimgpath));
+				$this->resource = imagecreatefromstring(\OC_Filesystem::file_get_contents(\OC_Filesystem::getLocalPath($newimgpath)));
 				$itype = IMAGETYPE_PNG;
 				OC_Log::write('core','OC_Image->loadFromFile, Default', OC_Log::DEBUG);
 				break;