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// Copyright (C) 2025 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:significant reason:default
#ifndef QIOOPERATION_P_P_H
#define QIOOPERATION_P_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include "qiooperation_p.h"
#include "qrandomaccessasyncfile_p.h"
#include <QtCore/private/qobject_p.h>
#include <QtCore/qspan.h>
#include <QtCore/qvarlengtharray.h>
#ifdef QT_RANDOMACCESSASYNCFILE_QIORING
#include <QtCore/private/qioring_p.h>
#endif
#include <variant>
QT_BEGIN_NAMESPACE
namespace QtPrivate {
class QIOOperationDataStorage
{
public:
// When passing QSpan<QSpan<T>>, we'd better have an underlying storage
// for an outer span, so that users could pass in a temporary object.
// We'd use QVarLengthArray for that. Having 256 elements (the default)
// seems to be unneeded for vectored IO. For now I picked 10 as a reasonable
// default. But maybe even less?
static constexpr qsizetype DefaultNumOfBuffers = 10;
using ReadSpans = QVarLengthArray<QSpan<std::byte>, DefaultNumOfBuffers>;
using WriteSpans = QVarLengthArray<QSpan<const std::byte>, DefaultNumOfBuffers>;
explicit QIOOperationDataStorage()
: data(std::monostate{})
{}
explicit QIOOperationDataStorage(QSpan<const QSpan<std::byte>> s)
: data(ReadSpans(s.begin(), s.end()))
{}
explicit QIOOperationDataStorage(QSpan<const QSpan<const std::byte>> s)
: data(WriteSpans(s.begin(), s.end()))
{}
explicit QIOOperationDataStorage(const QByteArray &a)
: data(a)
{}
explicit QIOOperationDataStorage(QByteArray &&a)
: data(std::move(a))
{}
bool isEmpty() const
{ return std::holds_alternative<std::monostate>(data); }
bool containsReadSpans() const
{ return std::holds_alternative<ReadSpans>(data); }
bool containsWriteSpans() const
{ return std::holds_alternative<WriteSpans>(data); }
bool containsByteArray() const
{ return std::holds_alternative<QByteArray>(data); }
ReadSpans &getReadSpans()
{
Q_ASSERT(containsReadSpans());
return *std::get_if<ReadSpans>(&data);
}
const ReadSpans &getReadSpans() const
{
Q_ASSERT(containsReadSpans());
return *std::get_if<ReadSpans>(&data);
}
WriteSpans &getWriteSpans()
{
Q_ASSERT(containsWriteSpans());
return *std::get_if<WriteSpans>(&data);
}
const WriteSpans &getWriteSpans() const
{
Q_ASSERT(containsWriteSpans());
return *std::get_if<WriteSpans>(&data);
}
QByteArray &getByteArray()
{
Q_ASSERT(containsByteArray());
return *std::get_if<QByteArray>(&data);
}
const QByteArray &getByteArray() const
{
Q_ASSERT(containsByteArray());
return *std::get_if<QByteArray>(&data);
}
// Potentially can be extended to return a QVariant::value<T>().
template <typename T>
T getValue() const = delete;
private:
std::variant<std::monostate, ReadSpans, WriteSpans, QByteArray> data;
};
template <>
inline QSpan<const QSpan<std::byte>> QIOOperationDataStorage::getValue() const
{
Q_ASSERT(std::holds_alternative<ReadSpans>(data));
const auto *val = std::get_if<ReadSpans>(&data);
if (val)
return QSpan(*val);
return {};
}
template <>
inline QSpan<const QSpan<const std::byte>> QIOOperationDataStorage::getValue() const
{
Q_ASSERT(std::holds_alternative<WriteSpans>(data));
const auto *val = std::get_if<WriteSpans>(&data);
if (val)
return QSpan(*val);
return {};
}
template <>
inline QByteArray QIOOperationDataStorage::getValue() const
{
Q_ASSERT(std::holds_alternative<QByteArray>(data));
const auto *val = std::get_if<QByteArray>(&data);
if (val)
return *val;
return {};
}
} // namespace QtPrivate
class QIOOperationPrivate : public QObjectPrivate
{
public:
Q_DECLARE_PUBLIC(QIOOperation)
enum class State : quint8
{
Running,
Finished,
};
explicit QIOOperationPrivate(QtPrivate::QIOOperationDataStorage *storage);
~QIOOperationPrivate();
static QIOOperationPrivate *get(QIOOperation *op)
{ return op->d_func(); }
void appendBytesProcessed(qint64 num);
void operationComplete(QIOOperation::Error err);
void setError(QIOOperation::Error err);
QPointer<QRandomAccessAsyncFile> file;
qint64 offset = 0;
qint64 processed = 0;
QIOOperation::Error error = QIOOperation::Error::None;
QIOOperation::Type type = QIOOperation::Type::Unknown;
State state = State::Running;
// takes ownership
std::unique_ptr<QtPrivate::QIOOperationDataStorage> dataStorage;
};
QT_END_NAMESPACE
#endif // QIOOPERATION_P_P_H
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