The format of Shared MIME Database magic values

Mon Dec 16 01:29:40 PST 2013

On Monday, 2013-12-16, 12:45:47, Alexander Kamyshnikov wrote:
> I'm confused a bit.
> So, you want to say that QMimeDatabase from Qt5 can be separately used in
> Qt4?
> I.e. i can just include this code in mine.

Not the Qt5 based code obviously. But Jerome said that there is a Qt4 port of 
the Qt5 code.

I guess he is referring to
https://github.com/pasnox/mimetypes-qt4 

Cheers,
Kevin

> Also, i'm trying to google "qmimedatabase qt4", but find nothing
> appropriate.
> A more concrete search direction will be welcome.
> P.S. Sorry, if i don't understand simple things. My english is not perfect
> yet.
> 
> 
> 2013/12/16 Kevin Krammer <krammer at kde.org>
> 
> > On Monday, 2013-12-16, 11:41:34, Alexander Kamyshnikov wrote:
> > > 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.
> > 
> > Just wanted to point out that the Qt5 implementation was contributed by
> > KDE
> > developers, so additional to the Qt4 port of that code there is also "the
> > original" Qt4 code available.
> > 
> > But of course if you need a pure C++ implementation without Qt then
> > writing a
> > new one is your only choice.
> > 
> > Cheers,
> > Kevin
> > 
> > > (see
> > 
> > http://api.kde.org/4.0-api/kdelibs-apidocs/kdecore/html/kmimetype_8h_sourc
> > e
> > .
> > 
> > > 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
> > > > 
> > > > _______________________________________________
> > > > 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
> > 
> > _______________________________________________
> > 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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