The format of Shared MIME Database magic values

[Alexander Kamyshnikov]

Hi Kevin. I'm glad to see KDE developer here because i'm KDE fan for many
years :)
But this KDE MIME-support code hardly depend from other KDE stuff, isn't it?
I need "pure" Qt code - this is our software client requirement :/
So i'm wrote CMimeDatabase class. And just want to make it fully compliant
with freedesktop standart.

(see
http://api.kde.org/4.0-api/kdelibs-apidocs/kdecore/html/kmimetype_8h_source.html
-
KUrl, KServiceType etc.)


2013/12/14 Kevin Krammer <krammer at kde.org>

> On Friday, 2013-12-13, 20:11:34, Jerome Leclanche wrote:
> > There is a Qt 4 port of this.
>
> And there should also be the original Qt4 based code in the kdelibs
> repository.
>
> Cheers,
> Kevin
>
> > As for windows support... I've been down that road, trying to provide
> > it. Windows' feature set doesn't even sort of come close; it only
> > provides real mime types for a limited set of registered extensions,
> > and it doesn't provide any of the very useful features such as
> > subclassing, etc. In the end, I gave up and am only providing
> > xdg-based mime types. I think Qt made an excellent choice in providing
> > the xdg database itself. But if you choose against that, good luck.
> >
> > Anyway you can have a look at my python-based mimetype lib. Magic
> > matches are implemented on line 192 onwards.
> >
> > https://github.com/Adys/python-xdg/blob/master/xdg/mime.py
> >
> > J. Leclanche
> >
> >
> > On Fri, Dec 13, 2013 at 7:56 PM, Alexander Kamyshnikov
> >
> > <axill777 at gmail.com> wrote:
> > > Yes, i had. But i decided to write my own implementation because:
> > > a) my project is forced to use Qt4 only (clients have very old
> versions of
> > > modified Red Hat with XDG_DATA_DIRS undefined);
> > > b) Windows support (through reading registry HKCR/.ext keys) is
> required;
> > > c) I'm very curious :)
> > >
> > > You think i'm should look deeply at the qmimedatabase.cpp however?
> > >
> > >
> > > 2013/12/13 Jerome Leclanche <adys.wh at gmail.com>
> > >
> > >> Have you had a look at the Qt 5 mimetype module?
> > >>
> > >> http://qt-project.org/doc/qt-5.0/qtcore/qmimedatabase.html
> > >> J. Leclanche
> > >>
> > >>
> > >> On Fri, Dec 13, 2013 at 7:35 PM, Alexander Kamyshnikov
> > >>
> > >> <axill777 at gmail.com> wrote:
> > >> > Hi all!
> > >> > I'm developing the implementation of MIME database in C++/Qt for one
> > >> > commercial program (requirement managment tool, if one will be
> > >> > interested).
> > >> > So my question is: the format of magic values to compare file header
> > >> > data
> > >> > with is not specified exactly in the spec. I mean the
> magic/match/value
> > >> > attribute.
> > >> > What exactly mean those magic strings from
> > >> > /usr/share/mime/packages/freedesktop.org.xml from my Kubuntu?
> > >> > 1) "\1\9"
> > >> > 2) "\376\067\0\043"
> > >> > 3) "\x8AMNG\x0D\x0A\x1A\x0A"
> > >> > Second is looks like octal number in C notation, third -
> hexadecimal,
> > >> > but
> > >> > about first i'm not sure. It is just "usual" decimal value?
> > >> > What format exactly should use magic values?
> > >> > Thanks for your help. WBR, Alexander
> > >> >
> > >> > P.S. Spec i'm using living here:
> > >> >
> > >> >
> http://standards.freedesktop.org/shared-mime-info-spec/shared-mime-info
> > >> > -spec-latest.html#id2661973 P.S. <match> items can be nested. But i
> > >> > can't find yet the clear way to implement their storage
> > >> > programmatically. Some kind of tree, or reverse polish notation
> should
> > >> > be used here? nevermind
> > >> >
> > >> > _______________________________________________
> > >> > xdg mailing list
> > >> > xdg at lists.freedesktop.org
> > >> > http://lists.freedesktop.org/mailman/listinfo/xdg
> >
> > _______________________________________________
> > xdg mailing list
> > xdg at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/xdg
> --
> Kevin Krammer, KDE developer, xdg-utils developer
> KDE user support, developer mentoring
>
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>
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