`mime-entity-read-field'.
   (let ((filename
         (or (mime-entity-filename entity)
             (let ((subj
-                   (or (mime-entity-read-field entity 'Content-Description)
-                       (mime-entity-read-field entity 'Subject))))
+                   (or (mime-read-field 'Content-Description entity)
+                       (mime-read-field 'Subject entity))))
               (if (and subj
                        (or (string-match mime-view-file-name-regexp-1 subj)
                            (string-match mime-view-file-name-regexp-2 subj)))
 
             ))))
 
 (defun mime-view-entity-title (entity)
-  (or (mime-entity-read-field entity 'Content-Description)
-      (mime-entity-read-field entity 'Subject)
+  (or (mime-read-field 'Content-Description entity)
+      (mime-read-field 'Subject entity)
       (mime-entity-filename entity)
       ""))