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// Copyright (C) 2022 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
#ifndef QSTRINGCONVERTER_BASE_H
#define QSTRINGCONVERTER_BASE_H
#if 0
// IWYU pragma: private, include "qstringconverter.h"
// QStringConverter(Base) class are handled in qstringconverter
#pragma qt_sync_stop_processing
#endif
#include <optional>
#include <QtCore/qglobal.h> // QT_{BEGIN,END}_NAMESPACE
#include <QtCore/qflags.h> // Q_DECLARE_FLAGS
#include <QtCore/qcontainerfwd.h>
#include <QtCore/qstringfwd.h>
#include <cstring>
QT_BEGIN_NAMESPACE
class QByteArrayView;
class QChar;
class QByteArrayView;
class QStringView;
#if QT_VERSION < QT_VERSION_CHECK(7, 0, 0) && !defined(Q_QDOC) && !defined(QT_BOOTSTRAPPED)
class QStringConverterBase
#else
class QStringConverter
#endif
{
public:
enum class Flag {
Default = 0,
Stateless = 0x1,
ConvertInvalidToNull = 0x2,
WriteBom = 0x4,
ConvertInitialBom = 0x8,
UsesIcu = 0x10,
};
Q_DECLARE_FLAGS(Flags, Flag)
struct State {
constexpr State(Flags f = Flag::Default) noexcept
: flags(f), state_data{0, 0, 0, 0} {}
~State() { clear(); }
State(State &&other) noexcept
: flags(other.flags),
remainingChars(other.remainingChars),
invalidChars(other.invalidChars),
state_data{other.state_data[0], other.state_data[1],
other.state_data[2], other.state_data[3]},
clearFn(other.clearFn)
{ other.clearFn = nullptr; }
State &operator=(State &&other) noexcept
{
clear();
flags = other.flags;
remainingChars = other.remainingChars;
invalidChars = other.invalidChars;
std::memmove(state_data, other.state_data, sizeof state_data); // self-assignment-safe
clearFn = other.clearFn;
other.clearFn = nullptr;
return *this;
}
Q_CORE_EXPORT void clear() noexcept;
Q_CORE_EXPORT void reset() noexcept;
Flags flags;
int internalState = 0;
qsizetype remainingChars = 0;
qsizetype invalidChars = 0;
union {
uint state_data[4];
void *d[2];
};
using ClearDataFn = void (*)(State *) noexcept;
ClearDataFn clearFn = nullptr;
private:
Q_DISABLE_COPY(State)
};
#if QT_VERSION < QT_VERSION_CHECK(7, 0, 0) && !defined(Q_QDOC) && !defined(QT_BOOTSTRAPPED)
protected:
QStringConverterBase() = default;
~QStringConverterBase() = default;
QStringConverterBase(QStringConverterBase &&) = default;
QStringConverterBase &operator=(QStringConverterBase &&) = default;
};
class QStringConverter : public QStringConverterBase
{
public:
#endif // Qt 6 compat for QStringConverterBase
enum Encoding {
Utf8,
#ifndef QT_BOOTSTRAPPED
Utf16,
Utf16LE,
Utf16BE,
Utf32,
Utf32LE,
Utf32BE,
#endif
Latin1,
System,
LastEncoding = System
};
protected:
struct Interface
{
using DecoderFn = QChar * (*)(QChar *out, QByteArrayView in, State *state);
using LengthFn = qsizetype (*)(qsizetype inLength);
using EncoderFn = char * (*)(char *out, QStringView in, State *state);
const char *name = nullptr;
DecoderFn toUtf16 = nullptr;
LengthFn toUtf16Len = nullptr;
EncoderFn fromUtf16 = nullptr;
LengthFn fromUtf16Len = nullptr;
};
constexpr QStringConverter() noexcept
: iface(nullptr)
{}
constexpr explicit QStringConverter(Encoding encoding, Flags f)
: iface(&encodingInterfaces[qsizetype(encoding)]), state(f)
{}
constexpr explicit QStringConverter(const Interface *i) noexcept
: iface(i)
{}
#if QT_CORE_REMOVED_SINCE(6, 8)
Q_CORE_EXPORT explicit QStringConverter(const char *name, Flags f);
#endif
Q_CORE_EXPORT explicit QStringConverter(QAnyStringView name, Flags f);
~QStringConverter() = default;
public:
QStringConverter(QStringConverter &&) = default;
QStringConverter &operator=(QStringConverter &&) = default;
bool isValid() const noexcept { return iface != nullptr; }
void resetState() noexcept
{
state.reset();
}
bool hasError() const noexcept { return state.invalidChars != 0; }
Q_CORE_EXPORT const char *name() const noexcept;
#if QT_CORE_REMOVED_SINCE(6, 8)
Q_CORE_EXPORT static std::optional<Encoding> encodingForName(const char *name) noexcept;
#endif
Q_CORE_EXPORT static std::optional<Encoding> encodingForName(QAnyStringView name) noexcept;
Q_DECL_PURE_FUNCTION Q_CORE_EXPORT static const char *nameForEncoding(Encoding e) noexcept;
Q_CORE_EXPORT static std::optional<Encoding>
encodingForData(QByteArrayView data, char16_t expectedFirstCharacter = 0) noexcept;
Q_CORE_EXPORT static std::optional<Encoding> encodingForHtml(QByteArrayView data);
Q_CORE_EXPORT static QStringList availableCodecs();
struct FinalizeResultBase
{
enum Error : quint8 {
NoError,
InvalidCharacters,
NotEnoughSpace,
};
};
template <typename Char>
struct FinalizeResultChar : FinalizeResultBase
{
using Error = FinalizeResultBase::Error;
Char *next;
qint16 invalidChars;
Error error;
};
protected:
const Interface *iface;
State state;
private:
Q_CORE_EXPORT static const Interface encodingInterfaces[Encoding::LastEncoding + 1];
};
Q_DECLARE_OPERATORS_FOR_FLAGS(QStringConverter::Flags)
QT_END_NAMESPACE
#endif
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