Use `rawurlencode` since this seems to be expected by cURL

Fixes https://github.com/owncloud/core/pull/11501#issuecomment-58794405

lib/private/largefilehelper.php

@@ -101,7 +101,7 @@ class LargeFileHelper {
 	*/
 	public function getFileSizeViaCurl($filename) {
 		if (function_exists('curl_init')) {
-			$fencoded = urlencode($filename);
+			$fencoded = rawurlencode($filename);
 			$ch = curl_init("file://$fencoded");
 			curl_setopt($ch, CURLOPT_NOBODY, true);
 			curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

tests/data/strängé filename (duplicate #2).txt

@@ -0,0 +1,4 @@
+Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
+Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
+Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

tests/lib/largefilehelpergetfilesize.php

@@ -20,8 +20,8 @@ class LargeFileHelperGetFileSize extends \PHPUnit_Framework_TestCase {
 	public function setUp() {
 		parent::setUp();
 		$ds = DIRECTORY_SEPARATOR;
-		$this->filename = dirname(__DIR__) . "{$ds}data{$ds}data.tar.gz";
-		$this->fileSize = 4195;
+		$this->filename = dirname(__DIR__) . "{$ds}data{$ds}strängé filename (duplicate #2).txt";
+		$this->fileSize = 446;
 		$this->helper = new \OC\LargeFileHelper;
 	}