[kmail2] [Bug 378007] New: Cannot display attached files for some weir content-type

[Éric Brunet]

https://bugs.kde.org/show_bug.cgi?id=378007

            Bug ID: 378007
           Summary: Cannot display attached files for some weir
                    content-type
           Product: kmail2
           Version: 4.14.10
          Platform: Fedora RPMs
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: commands and actions
          Assignee: kdepim-bugs at kde.org
          Reporter: eric.brunet at lps.ens.fr
  Target Milestone: ---

I am reading some email with a pdf file attached.

If I save the pdf in my home dir, I can open it without problem
If I click on the attachment to open it from kmail, I have some display bugs.

In fact, the temporary pdf file in /tmp/kde-*/kmail2*/ is corrupted; it is
shorter than it should be. In fact, after a more careful look, every sequence
of CRLF (0x0d 0x0a) has been replaced by LF (0x0a) in the binary pdf file, as
though dos2unix -f had been run on it.

In the email, I have the following contents-line for the attachment:

--------------050809070702050207010502
Content-Type: =?windows-1252?q?application/pdf;
 name="XXX.pdf"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
 filename="XXX.pdf"

Notice the windows-1252. For another mail where the Content-Type is

Content-Type: application/x-pdf;

then everything works perfectly.

I am not familiar with mime rules, and possibly the email I was sent is faulty.
But kmail should know enough to not run filters designed for text files on
binary files.

When googling the problem, I see that thunderbird had the same problem six
years ago; see https://bugzilla.mozilla.org/show_bug.cgi?id=659355

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