UTF-8 content with content type ISO-8859 not handled

[gabtoth]

In a multipart mail message (text + HTML) when the content type is ISO-8859-*, but the content of the part is actually UTF-8, then replying or forwarding the message display garbage characters (UTF-8 will be encoded in UTF-8)

[gabtoth]

Solution:

File main.inc, function rcube_charset_convert: check for bad content type

$from = strtoupper($from);

+ if ( from != "UTF-8" && bin2hex(substr($str,0,3)) == "efbbbf") {
+ already UTF-8, $from coding is bad
+ return $str;
+ }

$to = $to==NULL ? strtoupper(RCMAIL_CHARSET) : strtoupper($to);

[thomasb]

If the message specifies a wrong charset it's not a RoundCube bug when that message is not handled correctly. The fix you suggest checks for a BOM which is not necessarily existent in an UTF-8 coded string.