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List:       kmail-devel
Subject:    [Bug 52399] mime encoded mail with eight bit characters are displayed wrong
From:       Marc Mutz <mutz () kde ! org>
Date:       2002-12-30 13:00:57
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http://bugs.kde.org/show_bug.cgi?id=52399     




------- Additional Comments From mutz@kde.org  2002-12-30 14:00 -------
Subject: Re:  New: mime encoded mail with eight bit characters are displayed wrong

On Monday 30 December 2002 02:24, Ingo Klöcker wrote:
> Quoted-printable encoded data must not contain 8 bit characters. So
> basically the message you received was not correctly encoded. Maybe
> your mail server automatically converted the quoted-printable to 8
> bit (as indicated in the Content-Transfer-Encoding header of the
> message) but forgot to change the Content-Transfer-Encoding header of
> the message part accordingly.
>
> It's disputable whether the quoted-printable decoder should strip off
> 8 bit characters or whether the decoder should ignore and output
> them. Marc?

The decoder follows rfc 2045:

   NOTE: Several kinds of substrings cannot be generated according to
   the encoding rules for the quoted-printable content-transfer-
   encoding, and hence are formally illegal if they appear in the output
   of a quoted-printable encoder. This note enumerates these cases and
   suggests ways to handle such illegal substrings if any are
   encountered in quoted-printable data that is to be decoded.
<snip>
    (4)   Control characters other than TAB, or CR and LF as
          parts of CRLF pairs, must not appear. The same is true
          for octets with decimal values greater than 126.  If
          found in incoming quoted-printable data by a decoder, a
          robust implementation might exclude them from the
          decoded data and warn the user that illegal characters
          were discovered.

Marc
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