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/****************************************************************************
**
** Copyright (C) 2022 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QSTRINGCONVERTER_BASE_H
#define QSTRINGCONVERTER_BASE_H
#if 0
// 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 <cstring>
QT_BEGIN_NAMESPACE
class QByteArrayView;
class QChar;
class QByteArrayView;
class QStringView;
class QStringConverterBase
{
public:
enum class Flag {
Default = 0,
Stateless = 0x1,
ConvertInvalidToNull = 0x2,
WriteBom = 0x4,
ConvertInitialBom = 0x8
};
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;
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)
};
protected:
~QStringConverterBase() = default;
};
Q_DECLARE_OPERATORS_FOR_FLAGS(QStringConverterBase::Flags)
class QStringConverter : public QStringConverterBase
{
public:
enum Encoding {
Utf8,
Utf16,
Utf16LE,
Utf16BE,
Utf32,
Utf32LE,
Utf32BE,
Latin1,
System,
LastEncoding = System
};
#ifdef Q_QDOC
// document the flags here
enum class Flag {
Default = 0,
Stateless = 0x1,
ConvertInvalidToNull = 0x2,
WriteBom = 0x4,
ConvertInitialBom = 0x8
};
Q_DECLARE_FLAGS(Flags, Flag)
#endif
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[int(encoding)]), state(f)
{}
constexpr explicit QStringConverter(const Interface *i) noexcept
: iface(i)
{}
Q_CORE_EXPORT explicit QStringConverter(const char *name, Flags f) noexcept;
~QStringConverter() = default;
public:
QStringConverter(QStringConverter &&) = default;
QStringConverter &operator=(QStringConverter &&) = default;
bool isValid() const noexcept { return iface != nullptr; }
void resetState() noexcept
{
state.clear();
}
bool hasError() const noexcept { return state.invalidChars != 0; }
const char *name() const noexcept
{ return isValid() ? iface->name : nullptr; }
Q_CORE_EXPORT static std::optional<Encoding> encodingForName(const char *name) noexcept;
Q_CORE_EXPORT static const char *nameForEncoding(Encoding e);
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);
protected:
const Interface *iface;
State state;
private:
Q_CORE_EXPORT static const Interface encodingInterfaces[Encoding::LastEncoding + 1];
};
QT_END_NAMESPACE
#endif
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