- Skip conversion when input charset is BINARY

program/include/main.inc

@@ -197,7 +197,7 @@ function rcube_charset_convert($str, $from, $to=NULL)
   static $mbstring_list = null;
   static $convert_warning = false;
   static $conv = null;
-  
+
   $error = false;
 
   $to = empty($to) ? strtoupper(RCMAIL_CHARSET) : rcube_parse_charset($to);
@@ -341,6 +341,9 @@ function rcube_parse_charset($input)
     '/^X-/',            // X- prefix (e.g. X-ROMAN8 => ROMAN8)
     ), '', $charset);
 
+  if ($charset == 'BINARY')
+    return $charsets[$input] = null;
+
   # Aliases: some of them from HTML5 spec.
   $aliases = array(
     'USASCII'       => 'WINDOWS-1252',