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// Copyright (C) 2016 The Qt Company Ltd.
// Copyright (C) 2021 Igor Kushnir <igorkuo@gmail.com>
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include <QTest>
#include <QMimeDatabase>
using namespace Qt::StringLiterals;
namespace {
struct MatchModeInfo
{
QMimeDatabase::MatchMode mode;
const char *name;
};
constexpr MatchModeInfo matchModes[] = { { QMimeDatabase::MatchDefault, "Default" },
{ QMimeDatabase::MatchExtension, "Extension" },
{ QMimeDatabase::MatchContent, "Content" } };
void addFileRows(const char *tag, const QString &fileName, const QStringList &expectedMimeNames)
{
QCOMPARE(static_cast<std::size_t>(expectedMimeNames.size()), std::size(matchModes));
for (int i = 0; i < expectedMimeNames.size(); ++i) {
QTest::addRow(qPrintable(tag + QStringLiteral(" - %s")), matchModes[i].name)
<< fileName << matchModes[i].mode << expectedMimeNames[i];
}
}
void addExistentFileRows(const char *tag, const QString &fileName,
const QStringList &expectedMimeNames)
{
const QString filePath = QFINDTESTDATA("files/" + fileName);
QVERIFY2(!filePath.isEmpty(),
qPrintable(QStringLiteral("Cannot find test file %1 in files/").arg(fileName)));
addFileRows(tag, filePath, expectedMimeNames);
}
}
class tst_QMimeDatabase: public QObject
{
Q_OBJECT
private slots:
void inheritsPerformance();
void benchMimeTypeForName();
void benchMimeTypeForFile_data();
void benchMimeTypeForFile();
};
void tst_QMimeDatabase::inheritsPerformance()
{
// Check performance of inherits().
// This benchmark (which started in 2009 in kmimetypetest.cpp) uses 40 mimetypes.
// (eight groups of five unique ones)
const QString uniqueMimeTypes[] = {
u"image/jpeg"_s,
u"image/png"_s,
u"image/tiff"_s,
u"text/plain"_s,
u"text/html"_s,
};
constexpr size_t NumOuterLoops = 40 / std::size(uniqueMimeTypes);
QMimeDatabase db;
const QMimeType mime = db.mimeTypeForName(u"text/x-chdr"_s);
QVERIFY(mime.isValid());
QString match;
QBENCHMARK {
for (size_t i = 0; i < NumOuterLoops; ++i) {
for (const QString &mt : uniqueMimeTypes) {
if (mime.inherits(mt)) {
match = mt;
// of course there would normally be a "break" here, but
// we're testing worse-case performance here
}
}
}
}
QCOMPARE(match, u"text/plain"_s);
// Numbers from 2011, in release mode:
// KDE 4.7 numbers: 0.21 msec / 494,000 ticks / 568,345 instr. loads per iteration
// QMimeBinaryProvider (with Qt 5): 0.16 msec / NA / 416,049 instr. reads per iteration
// QMimeXmlProvider (with Qt 5): 0.062 msec / NA / 172,889 instr. reads per iteration
// (but the startup time is way higher)
// And memory usage is flat at 200K with QMimeBinaryProvider, while it peaks at 6 MB when
// parsing XML, and then keeps being around 4.5 MB for all the in-memory hashes.
}
void tst_QMimeDatabase::benchMimeTypeForName()
{
QMimeDatabase db;
QBENCHMARK {
const auto s = db.mimeTypeForName(QStringLiteral("text/plain"));
QVERIFY(s.isValid());
}
}
void tst_QMimeDatabase::benchMimeTypeForFile_data()
{
QTest::addColumn<QString>("fileName");
QTest::addColumn<QMimeDatabase::MatchMode>("mode");
QTest::addColumn<QString>("expectedMimeName");
addFileRows("archive", "a.tar.gz",
{ "application/x-compressed-tar",
"application/x-compressed-tar",
"application/octet-stream" });
addFileRows("OpenDocument Text", "b.odt",
{ "application/vnd.oasis.opendocument.text",
"application/vnd.oasis.opendocument.text",
"application/octet-stream" });
addExistentFileRows(
"existent archive with extension", "N.tar.gz",
{ "application/x-compressed-tar", "application/x-compressed-tar", "application/gzip" });
addExistentFileRows("existent C with extension", "t.c",
{ "text/x-csrc", "text/x-csrc", "text/plain" });
addExistentFileRows("existent text file with extension", "u.txt",
{ "text/plain", "text/plain", "text/plain" });
addExistentFileRows("existent C w/o extension", "X",
{ "text/x-csrc", "application/octet-stream", "text/x-csrc" });
addExistentFileRows("existent patch w/o extension", "y",
{ "text/x-patch", "application/octet-stream", "text/x-patch" });
addExistentFileRows("existent archive w/o extension", "z",
{ "application/gzip", "application/octet-stream", "application/gzip" });
}
void tst_QMimeDatabase::benchMimeTypeForFile()
{
QFETCH(const QString, fileName);
QFETCH(const QMimeDatabase::MatchMode, mode);
QFETCH(const QString, expectedMimeName);
QMimeDatabase db;
QBENCHMARK {
const auto mimeType = db.mimeTypeForFile(fileName, mode);
QCOMPARE(mimeType.name(), expectedMimeName);
}
}
QTEST_MAIN(tst_QMimeDatabase)
#include "tst_bench_qmimedatabase.moc"
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