Re: Fake PDF

[Bruce Steers <bsteers4@xxxxxxxxx>]

I'd say it's a case of "horses for courses"
Meaning variation is good depending on the results you want.

For example a .gambas executable with file returns something like
application/xoctet-stream
With DesktopMime I get application/gambas-executable
(I'm not at home so can't say precisely, it's something like that)

But I like that choice of different results. I can use either depending on
what I do with the result

Respects
BruceS


On Thu, 26 Feb 2026, 09:21 Fabien Bodard, <gambas.fr@xxxxxxxxx> wrote:

> The gambas function just use the extension part of the mime to simplify
> and accelerate the recognition of the type.
> Using the magic string is more complicated as it need to read each file
> content.
>
> It can be done but need more work and might slow the recognition.
>
>
> Fabien Bodard
>
> Le mer. 25 févr. 2026, 00:55, Gianluigi <gradobag@xxxxxxxxxxx> a écrit :
>
>> Il 24/02/26 22:22, Lee ha scritto:
>> > On 2/24/26 3:21 PM, Benoît Minisini wrote:
>> >> Le 24/02/2026 à 21:03, gbWilly a écrit :
>> >>>
>> >>> On Tuesday, February 24th, 2026 at 18:59, Lee
>> >>> <t.lee.davidson@xxxxxxxxx> wrote:
>> >>>>
>> > [snip]
>> >>>
>> >>>> Simplified, DesktopMime.FromFile() looks up the file extension in "/
>> >>>> usr/share/mime/globs2", finds that it is of type
>> >>>> "application/pdf", and returns that text. BTW, the Stat object
>> >>>> created by the Stat() function will also falsely return
>> >>>> "application/pdf" for that fake PDF file.
>> >>
>> >> What are you talking about? The 'Stat' class never returns a file type.
>> >
>> > I was talking rubbish. You are correct. I had added code to Gianluigi's
>> > project to print the Stat.Type of the file but failed to distinguish
>> his
>> > output from mine.
>> >
>> >
>> > [snip]
>> >>> Maybe the core Gambas should have a function to return the TRUE MIME
>> >>> type of a file instead of relying on the gb.desktop component
>> >>> I wonder what Benoit has to say about this matter on 'TRUE' and
>> >>> 'FAKE' MIME type and a proper MIME type function?
>> >>>
>> >>
>> >> What's the problem with using the 'file' command? I don't see the need
>> >> of reimplementing the wheel if that command exists, unless there is a
>> >> library that implements the same algorithm than 'file'. In that case
>> >> it could be used through a Gambas API. Otherwise, just use the 'file'
>> >> command directly.
>> >
>> > The MicroHttpd project I created some time ago uses "libmagic" (see
>> `man
>> > 3 libmagic`) to get the real mime-type of a file. I extracted the
>> > implementing code from that project and added it to Gianluigi's FakePDF
>> > project. Demo attached.
>> >
>> >
>>
>> Hi everyone,
>>
>> Sorry for the delay in responding (Netflix night) :-)
>> Thank you for all the feedback, and I've followed your suggestion and
>> attached the results.
>>
>> @Lee, thanks, but your library doesn't seem to work here. This is the
>> console output:
>> Fake mime-type: application/pdf
>> Real mime-type: Ïh^^
>>
>> Thanks again, I'm off to sleep now.
>>
>> Good night
>> Gianluigi
>>
>