Revision control
++ // Copyright (C) 2020 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 <QtCore/qstring.h>
++
++ #ifndef QSTRINGBUILDER_H
++ #define QSTRINGBUILDER_H
++
++ #if 0
++ // syncqt can not handle the templates in this file, and it doesn't need to
++ // process them anyway because they are internal.
++ #pragma qt_class(QStringBuilder)
++ #pragma qt_sync_stop_processing
++ #endif
++
++ #include <QtCore/qbytearray.h>
++
++ #include <string.h>
++
++ QT_BEGIN_NAMESPACE
++
++
++ struct Q_CORE_EXPORT QAbstractConcatenable
++ {
++ protected:
++ static void convertFromUtf8(QByteArrayView in, QChar *&out) noexcept;
++ static inline void convertFromAscii(char a, QChar *&out) noexcept
++ {
++ *out++ = QLatin1Char(a);
++ }
++ static void appendLatin1To(QLatin1StringView in, QChar *out) noexcept;
++ };
++
++ template <typename T> struct QConcatenable;
++
++ template <typename T>
++ using QConcatenableEx = QConcatenable<q20::remove_cvref_t<T>>;
++
++ namespace QtStringBuilder {
++ template <typename A, typename B> struct ConvertToTypeHelper
++ { typedef A ConvertTo; };
++ template <typename T> struct ConvertToTypeHelper<T, QString>
++ { typedef QString ConvertTo; };
++
++ template <typename T> using HasIsNull = decltype(std::declval<const T &>().isNull());
++ template <typename T> bool isNull(const T &t)
++ {
++ if constexpr (qxp::is_detected_v<HasIsNull, T>)
++ return t.isNull();
++ else
++ return false;
++ }
++ }
++
++ template<typename Builder, typename T>
++ struct QStringBuilderCommon
++ {
++ T toUpper() const { return resolved().toUpper(); }
++ T toLower() const { return resolved().toLower(); }
++
++ protected:
++ T resolved() const { return *static_cast<const Builder*>(this); }
++ };
++
++ template<typename Builder, typename T>
++ struct QStringBuilderBase : public QStringBuilderCommon<Builder, T>
++ {
++ };
++
++ template<typename Builder>
++ struct QStringBuilderBase<Builder, QString> : public QStringBuilderCommon<Builder, QString>
++ {
++ QByteArray toLatin1() const { return this->resolved().toLatin1(); }
++ QByteArray toUtf8() const { return this->resolved().toUtf8(); }
++ QByteArray toLocal8Bit() const { return this->resolved().toLocal8Bit(); }
++ };
++
++ template <typename A, typename B>
++ class QStringBuilder : public QStringBuilderBase<QStringBuilder<A, B>,
++ typename QtStringBuilder::ConvertToTypeHelper<
++ typename QConcatenableEx<A>::ConvertTo,
++ typename QConcatenableEx<B>::ConvertTo
++ >::ConvertTo
++ >
++ {
++ public:
++ QStringBuilder(A &&a_, B &&b_) : a(std::forward<A>(a_)), b(std::forward<B>(b_)) {}
++
++ QStringBuilder(QStringBuilder &&) = default;
++ QStringBuilder(const QStringBuilder &) = default;
++ ~QStringBuilder() = default;
++
++ private:
++ friend class QByteArray;
++ friend class QString;
++ template <typename T> T convertTo() const
++ {
++ if (isNull()) {
++ // appending two null strings must give back a null string,
++ // so we're special casing this one out, QTBUG-114206
++ return T();
++ }
++ return convertToImpl<T>(Concatenable::size(*this));
++ }
++ template <typename T> T convertToImpl(const qsizetype len) const
++ {
++ T s(len, Qt::Uninitialized);
++
++ // Using data_ptr() here (private API) so we can bypass the
++ // isDetached() and the replacement of a null pointer with _empty in
++ // both QString and QByteArray's data() and constData(). The result is
++ // the same if len != 0.
++ auto d = reinterpret_cast<typename T::iterator>(s.data_ptr().data());
++ const auto start = d;
++ Concatenable::appendTo(*this, d);
++
++ if constexpr (Concatenable::ExactSize) {
++ Q_UNUSED(start)
++ } else {
++ if (len != d - start) {
++ // this resize is necessary since we allocate a bit too much
++ // when dealing with variable sized 8-bit encodings
++ s.resize(d - start);
++ }
++ }
++ return s;
++ }
++
++ typedef QConcatenable<QStringBuilder<A, B> > Concatenable;
++ public:
++ typedef typename Concatenable::ConvertTo ConvertTo;
++ operator ConvertTo() const { return convertTo<ConvertTo>(); }
++
++ qsizetype size() const { return Concatenable::size(*this); }
++
++ bool isNull() const
++ {
++ return QtStringBuilder::isNull(a) && QtStringBuilder::isNull(b);
++ }
++
++ A a;
++ B b;
++
++ private:
++ QStringBuilder &operator=(QStringBuilder &&) = delete;
++ QStringBuilder &operator=(const QStringBuilder &) = delete;
++ };
++
++ template <> struct QConcatenable<char> : private QAbstractConcatenable
++ {
++ typedef char type;
++ typedef QByteArray ConvertTo;
++ enum { ExactSize = true };
++ static qsizetype size(const char) { return 1; }
++ #ifndef QT_NO_CAST_FROM_ASCII
++ QT_ASCII_CAST_WARN static inline void appendTo(const char c, QChar *&out)
++ {
++ QAbstractConcatenable::convertFromAscii(c, out);
++ }
++ #endif
++ static inline void appendTo(const char c, char *&out)
++ { *out++ = c; }
++ };
++
++ template <> struct QConcatenable<QByteArrayView> : private QAbstractConcatenable
++ {
++ typedef QByteArrayView type;
++ typedef QByteArray ConvertTo;
++ enum { ExactSize = true };
++ static qsizetype size(QByteArrayView bav) { return bav.size(); }
++ #ifndef QT_NO_CAST_FROM_ASCII
++ QT_ASCII_CAST_WARN static inline void appendTo(QByteArrayView bav, QChar *&out)
++ {
++ QAbstractConcatenable::convertFromUtf8(bav, out);
++ }
++ #endif
++ static inline void appendTo(QByteArrayView bav, char *&out)
++ {
++ qsizetype n = bav.size();
++ if (n)
++ memcpy(out, bav.data(), n);
++ out += n;
++ }
++ };
++
++ template <> struct QConcatenable<char16_t> : private QAbstractConcatenable
++ {
++ typedef char16_t type;
++ typedef QString ConvertTo;
++ enum { ExactSize = true };
++ static constexpr qsizetype size(char16_t) { return 1; }
++ static inline void appendTo(char16_t c, QChar *&out)
++ { *out++ = c; }
++ };
++
++ template <> struct QConcatenable<QLatin1Char>
++ {
++ typedef QLatin1Char type;
++ typedef QString ConvertTo;
++ enum { ExactSize = true };
++ static qsizetype size(const QLatin1Char) { return 1; }
++ static inline void appendTo(const QLatin1Char c, QChar *&out)
++ { *out++ = c; }
++ static inline void appendTo(const QLatin1Char c, char *&out)
++ { *out++ = c.toLatin1(); }
++ };
++
++ template <> struct QConcatenable<QChar> : private QAbstractConcatenable
++ {
++ typedef QChar type;
++ typedef QString ConvertTo;
++ enum { ExactSize = true };
++ static qsizetype size(const QChar) { return 1; }
++ static inline void appendTo(const QChar c, QChar *&out)
++ { *out++ = c; }
++ };
++
++ template <> struct QConcatenable<QChar::SpecialCharacter> : private QAbstractConcatenable
++ {
++ typedef QChar::SpecialCharacter type;
++ typedef QString ConvertTo;
++ enum { ExactSize = true };
++ static qsizetype size(const QChar::SpecialCharacter) { return 1; }
++ static inline void appendTo(const QChar::SpecialCharacter c, QChar *&out)
++ { *out++ = c; }
++ };
++
++ template <> struct QConcatenable<QLatin1StringView> : private QAbstractConcatenable
++ {
++ typedef QLatin1StringView type;
++ typedef QString ConvertTo;
++ enum { ExactSize = true };
++ static qsizetype size(const QLatin1StringView a) { return a.size(); }
++ static inline void appendTo(const QLatin1StringView a, QChar *&out)
++ {
++ appendLatin1To(a, out);
++ out += a.size();
++ }
++ static inline void appendTo(const QLatin1StringView a, char *&out)
++ {
++ if (const char *data = a.data()) {
++ memcpy(out, data, a.size());
++ out += a.size();
++ }
++ }
++ };
++
++ template <> struct QConcatenable<QString> : private QAbstractConcatenable
++ {
++ typedef QString type;
++ typedef QString ConvertTo;
++ enum { ExactSize = true };
++ static qsizetype size(const QString &a) { return a.size(); }
++ static inline void appendTo(const QString &a, QChar *&out)
++ {
++ const qsizetype n = a.size();
++ if (n)
++ memcpy(out, a.data(), sizeof(QChar) * n);
++ out += n;
++ }
++ };
++
++ template <> struct QConcatenable<QStringView> : private QAbstractConcatenable
++ {
++ typedef QStringView type;
++ typedef QString ConvertTo;
++ enum { ExactSize = true };
++ static qsizetype size(QStringView a) { return a.size(); }
++ static inline void appendTo(QStringView a, QChar *&out)
++ {
++ const auto n = a.size();
++ if (n)
++ memcpy(out, a.data(), sizeof(QChar) * n);
++ out += n;
++ }
++ };
++
++ template <qsizetype N> struct QConcatenable<const char[N]> : private QAbstractConcatenable
++ {
++ typedef const char type[N];
++ typedef QByteArray ConvertTo;
++ enum { ExactSize = false };
++ static qsizetype size(const char[N]) { return N - 1; }
++ #ifndef QT_NO_CAST_FROM_ASCII
++ QT_ASCII_CAST_WARN static inline void appendTo(const char a[N], QChar *&out)
++ {
++ QAbstractConcatenable::convertFromUtf8(QByteArrayView(a, N - 1), out);
++ }
++ #endif
++ static inline void appendTo(const char a[N], char *&out)
++ {
++ while (*a)
++ *out++ = *a++;
++ }
++ };
++
++ template <qsizetype N> struct QConcatenable<char[N]> : QConcatenable<const char[N]>
++ {
++ typedef char type[N];
++ };
++
++ template <> struct QConcatenable<const char *> : private QAbstractConcatenable
++ {
++ typedef const char *type;
++ typedef QByteArray ConvertTo;
++ enum { ExactSize = false };
++ static qsizetype size(const char *a) { return qstrlen(a); }
++ #ifndef QT_NO_CAST_FROM_ASCII
++ QT_ASCII_CAST_WARN static inline void appendTo(const char *a, QChar *&out)
++ { QAbstractConcatenable::convertFromUtf8(QByteArrayView(a), out); }
++ #endif
++ static inline void appendTo(const char *a, char *&out)
++ {
++ if (!a)
++ return;
++ while (*a)
++ *out++ = *a++;
++ }
++ };
++
++ template <> struct QConcatenable<char *> : QConcatenable<const char*>
++ {
++ typedef char *type;
++ };
++
++ template <qsizetype N> struct QConcatenable<const char16_t[N]> : private QAbstractConcatenable
++ {
++ using type = const char16_t[N];
++ using ConvertTo = QString;
++ enum { ExactSize = true };
++ static qsizetype size(const char16_t[N]) { return N - 1; }
++ static void appendTo(const char16_t a[N], QChar *&out)
++ {
++ memcpy(static_cast<void *>(out), a, (N - 1) * sizeof(char16_t));
++ out += N - 1;
++ }
++ };
++
++ template <qsizetype N> struct QConcatenable<char16_t[N]> : QConcatenable<const char16_t[N]>
++ {
++ using type = char16_t[N];
++ };
++
++ template <> struct QConcatenable<const char16_t *> : private QAbstractConcatenable
++ {
++ using type = const char16_t *;
++ using ConvertTo = QString;
++ enum { ExactSize = true };
++ static qsizetype size(const char16_t *a) { return QStringView(a).size(); }
++ static inline void appendTo(const char16_t *a, QChar *&out)
++ {
++ if (!a)
++ return;
++ while (*a)
++ *out++ = *a++;
++ }
++ };
++
++ template <> struct QConcatenable<char16_t *> : QConcatenable<const char16_t*>
++ {
++ typedef char16_t *type;
++ };
++
++ template <> struct QConcatenable<QByteArray> : private QAbstractConcatenable
++ {
++ typedef QByteArray type;
++ typedef QByteArray ConvertTo;
++ enum { ExactSize = false };
++ static qsizetype size(const QByteArray &ba) { return ba.size(); }
++ #ifndef QT_NO_CAST_FROM_ASCII
++ QT_ASCII_CAST_WARN static inline void appendTo(const QByteArray &ba, QChar *&out)
++ {
++ QAbstractConcatenable::convertFromUtf8(ba, out);
++ }
++ #endif
++ static inline void appendTo(const QByteArray &ba, char *&out)
++ {
++ const qsizetype n = ba.size();
++ if (n)
++ memcpy(out, ba.begin(), n);
++ out += n;
++ }
++ };
++
++
++ template <typename A, typename B>
++ struct QConcatenable< QStringBuilder<A, B> >
++ {
++ typedef QStringBuilder<A, B> type;
++ using ConvertTo = typename QtStringBuilder::ConvertToTypeHelper<
++ typename QConcatenableEx<A>::ConvertTo,
++ typename QConcatenableEx<B>::ConvertTo
++ >::ConvertTo;
++ enum { ExactSize = QConcatenableEx<A>::ExactSize && QConcatenableEx<B>::ExactSize };
++ static qsizetype size(const type &p)
++ {
++ return QConcatenableEx<A>::size(p.a) + QConcatenableEx<B>::size(p.b);
++ }
++ template<typename T> static inline void appendTo(const type &p, T *&out)
++ {
++ QConcatenableEx<A>::appendTo(p.a, out);
++ QConcatenableEx<B>::appendTo(p.b, out);
++ }
++ };
++
++ template <typename A, typename B,
++ typename = std::void_t<typename QConcatenableEx<A>::type, typename QConcatenableEx<B>::type>>
++ auto operator%(A &&a, B &&b)
++ {
++ return QStringBuilder<A, B>(std::forward<A>(a), std::forward<B>(b));
++ }
++
++ // QT_USE_FAST_OPERATOR_PLUS was introduced in 4.7, QT_USE_QSTRINGBUILDER is to be used from 4.8 onwards
++ // QT_USE_FAST_OPERATOR_PLUS does not remove the normal operator+ for QByteArray
++ #if defined(QT_USE_FAST_OPERATOR_PLUS) || defined(QT_USE_QSTRINGBUILDER)
++ template <typename A, typename B,
++ typename = std::void_t<typename QConcatenableEx<A>::type, typename QConcatenableEx<B>::type>>
++ auto operator+(A &&a, B &&b)
++ {
++ return std::forward<A>(a) % std::forward<B>(b);
++ }
++ #endif
++
++ namespace QtStringBuilder {
++ template <typename A, typename B>
++ QByteArray &appendToByteArray(QByteArray &a, const QStringBuilder<A, B> &b, char)
++ {
++ // append 8-bit data to a byte array
++ qsizetype len = a.size() + QConcatenable< QStringBuilder<A, B> >::size(b);
++ a.detach(); // a detach() in a.data() could reset a.capacity() to a.size()
++ if (len > a.data_ptr().freeSpaceAtEnd()) // capacity() was broken when prepend()-optimization landed
++ a.reserve(qMax(len, 2 * a.capacity()));
++ char *it = a.data() + a.size();
++ QConcatenable< QStringBuilder<A, B> >::appendTo(b, it);
++ a.resize(len); //we need to resize after the appendTo for the case str+=foo+str
++ return a;
++ }
++
++ #ifndef QT_NO_CAST_TO_ASCII
++ template <typename A, typename B>
++ QByteArray &appendToByteArray(QByteArray &a, const QStringBuilder<A, B> &b, QChar)
++ {
++ return a += QString(b).toUtf8();
++ }
++ #endif
++ }
++
++ template <typename A, typename B>
++ QByteArray &operator+=(QByteArray &a, const QStringBuilder<A, B> &b)
++ {
++ return QtStringBuilder::appendToByteArray(a, b,
++ typename QConcatenable< QStringBuilder<A, B> >::ConvertTo::value_type());
++ }
++
++ template <typename A, typename B>
++ QString &operator+=(QString &a, const QStringBuilder<A, B> &b)
++ {
++ qsizetype len = a.size() + QConcatenable< QStringBuilder<A, B> >::size(b);
++ a.detach(); // a detach() in a.data() could reset a.capacity() to a.size()
++ if (len > a.data_ptr().freeSpaceAtEnd()) // capacity() was broken when prepend()-optimization landed
++ a.reserve(qMax(len, 2 * a.capacity()));
++ QChar *it = a.data() + a.size();
++ QConcatenable< QStringBuilder<A, B> >::appendTo(b, it);
++ // we need to resize after the appendTo for the case str+=foo+str
++ a.resize(it - a.constData()); //may be smaller than len if there was conversion from utf8
++ return a;
++ }
++
++ QT_END_NAMESPACE
++
++ #endif // QSTRINGBUILDER_H