? sites/default/files
? sites/default/settings.php
Index: includes/unicode.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/unicode.inc,v
retrieving revision 1.30
diff -u -p -r1.30 unicode.inc
--- includes/unicode.inc	14 Apr 2008 17:48:33 -0000	1.30
+++ includes/unicode.inc	10 Jun 2008 00:27:38 -0000
@@ -270,13 +270,20 @@ function truncate_utf8($string, $len, $w
  * See http://www.rfc-editor.org/rfc/rfc2047.txt for more information.
  *
  * Notes:
- * - Only encode strings that contain non-ASCII characters.
+ * - Only encode strings that contain non-ASCII characters, unless the optional
+ *   second parameter is defined, in which case perform quoted-string encoding
+ *   on strings containing non-alphanumeric ASCII characters.
  * - We progressively cut-off a chunk with truncate_utf8(). This is to ensure
  *   each chunk starts and ends on a character boundary.
  * - Using \n as the chunk separator may cause problems on some systems and may
  *   have to be changed to \r\n or \r.
+ *
+ * @param $string
+ *   The string to encode.
+ * @param $quoted
+ *   If set, perform quoted-string encoding of non-alphanumeric ASCII.
  */
-function mime_header_encode($string) {
+function mime_header_encode($string, $quoted = FALSE) {
   if (preg_match('/[^\x20-\x7E]/', $string)) {
     $chunk_size = 47; // floor((75 - strlen("=?UTF-8?B??=")) * 0.75);
     $len = strlen($string);
@@ -290,6 +297,12 @@ function mime_header_encode($string) {
     }
     return trim($output);
   }
+  // Strings containing spaces and certain other characters must in some cases
+  // be quoted-string encoded.
+  if ($quoted && preg_match('/[^A-Za-z0-9_]/', $string)) {
+    // Escape double-quotes and backslashes.
+    return '"' . addcslashes($string, '\"') . '"';
+  }
   return $string;
 }