Revision control
++ // Copyright (C) 2016 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
++ // Qt-Security score:critical reason:data-parser
++
++ #include "qglobal.h"
++ #include "qdebug.h"
++ #include "qlocale_p.h"
++ #include "qmutex.h"
++
++ #include "unicode/uloc.h"
++ #include "unicode/ustring.h"
++
++ QT_BEGIN_NAMESPACE
++
++ static_assert(std::is_same_v<UChar, char16_t>,
++ "Hmm... in C++ mode, ICU's UChar ought to be char16_t");
++
++ namespace QtIcuPrivate {
++
++ enum class IcuCaseConversion : bool { Upper, Lower };
++
++ static bool qt_u_strToCase(const QString &str, QString *out, const char *localeID,
++ IcuCaseConversion conv)
++ {
++ Q_ASSERT(out);
++
++ int32_t size = str.size();
++ size += size >> 2; // add 25% for possible expansions
++ QString result(size, Qt::Uninitialized);
++
++ UErrorCode status = U_ZERO_ERROR;
++
++ const auto caseFunc = [conv] (auto&&...args) {
++ // try to be a completely transparent wrapper:
++ using R [[maybe_unused]] = decltype(u_strToUpper(std::forward<decltype(args)>(args)...));
++ switch (conv) {
++ case IcuCaseConversion::Upper:
++ return u_strToUpper(std::forward<decltype(args)>(args)...);
++ case IcuCaseConversion::Lower:
++ return u_strToLower(std::forward<decltype(args)>(args)...);
++ };
++ Q_UNREACHABLE_RETURN(R{0});
++ };
++
++ size = caseFunc(result.data_ptr().data(), result.size(),
++ str.data_ptr().data(), str.size(),
++ localeID, &status);
++
++ if (U_FAILURE(status) && status != U_BUFFER_OVERFLOW_ERROR)
++ return false;
++
++ if (size < result.size()) {
++ result.resize(size);
++ } else if (size > result.size()) {
++ // the resulting string is larger than our source string
++ result.resize(size);
++
++ status = U_ZERO_ERROR;
++ size = caseFunc(result.data_ptr().data(), result.size(),
++ str.data_ptr().data(), str.size(),
++ localeID, &status);
++
++ if (U_FAILURE(status))
++ return false;
++
++ // if the sizes don't match now, we give up.
++ if (size != result.size())
++ return false;
++ }
++
++ *out = std::move(result);
++ return true;
++ }
++
++ } // namespace QtIcuPrivate
++
++ QString QLocalePrivate::toUpper(const QString &str, bool *ok) const
++ {
++ Q_ASSERT(ok);
++ using namespace QtIcuPrivate;
++ QString out;
++ *ok = qt_u_strToCase(str, &out, bcp47Name('_'), IcuCaseConversion::Upper);
++ return out;
++ }
++
++ QString QLocalePrivate::toLower(const QString &str, bool *ok) const
++ {
++ Q_ASSERT(ok);
++ using namespace QtIcuPrivate;
++ QString out;
++ *ok = qt_u_strToCase(str, &out, bcp47Name('_'), IcuCaseConversion::Lower);
++ return out;
++ }
++
++ QT_END_NAMESPACE