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This compression algorithm is permitted in the XML sources, which
instructs RCC to apply the best compression algorithm it has available.
If we have Zstandard available, that's its level 19 (levels 20 and up
are experimental). If not, we apply zlib compression level 9.
And apply this technique for the XDG MIME database that is built-in to
QtCore.
Payload size Compr. time
Previously 313916 17.9ms
Zlib -9 310899 53.6ms
Zstd -14 253364 63.3ms (plus 4.0 ms on L1 heuristic check)
Zstd -19 230647 642.5ms
Change-Id: I343f2beed55440a7ac0bfffd1562de44dbaf09cd
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
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Previously, we would use mime.cache in all mime directories if at
least one of them had such a file (other than the most-local one),
otherwise the "source" XML would be used in all directories.
Now it's possible to use mime.cache in those directories which
have one, and XML in those directories that don't.
Not only is this more correct, it will allow in a subsequent
commit to bundle the binary cache in QtCore's qrc rather than
the very big XML file.
The design change to allow this is that now every provider
only deals with a single directory, and QMimeDatabasePrivate
takes care of creating multiple providers, one for each dir.
This required to move most of the loops from the binary provider
up to QMimeDatabasePrivate itself.
Change-Id: Iac82d5f5836b80d45076e586b903d16fa2525b34
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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History of the development before the import:
ssh://codereview.qt-project.org/playground/mimetypes.git
Mimetype definitions come from shared-mime-info where available (UNIX systems),
loaded using a mmap'ed binary cache generated by update-mime-database.
As a fallback if no cache is found, we parse the raw XML files otherwise.
This makes the MIME type support fast and with very low memory usage on UNIX,
and it makes it easy to use on Windows (no dependency on shared-mime-info,
Qt even includes a freedesktop.xml file to use if none are found on the system).
Change-Id: I27b05008216ff936dc463bd80d3893422bfb940e
Reviewed-by: Richard J. Moore <rich@kde.org>
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