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// 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