prevent xss attacks

apps/files/templates/part.breadcrumb.php

 	<?php for($i=0; $i<count($_["breadcrumb"]); $i++):
         $crumb = $_["breadcrumb"][$i]; ?>
-		<div class="crumb <?php if($i == count($_["breadcrumb"])-1) echo 'last';?> svg" data-dir='<?php echo $crumb["dir"];?>' style='background-image:url("<?php echo OCP\image_path('core','breadcrumb.png');?>")'>
-		<a href="<?php echo $_['baseURL'].$crumb["dir"]; ?>"><?php echo OCP\Util::sanitizeHTML($crumb["name"]); ?></a>
+		<div class="crumb <?php if($i == count($_["breadcrumb"])-1) echo 'last';?> svg" data-dir='<?php echo urlencode($crumb["dir"]);?>' style='background-image:url("<?php echo OCP\image_path('core','breadcrumb.png');?>")'>
+		<a href="<?php echo $_['baseURL'].urlencode($crumb["dir"]); ?>"><?php echo OCP\Util::sanitizeHTML($crumb["name"]); ?></a>
 		</div>
 	<?php endfor;?>