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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
#ifndef QNONCONTIGUOUSBYTEDEVICE_P_H
#define QNONCONTIGUOUSBYTEDEVICE_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of a number of Qt sources files. This header file may change from
// version to version without notice, or even be removed.
//
// We mean it.
//
#include <QtCore/qobject.h>
#include <QtCore/qbytearray.h>
#include <QtCore/qbuffer.h>
#include <QtCore/qiodevice.h>
#include "private/qringbuffer_p.h"
#include <memory>
QT_BEGIN_NAMESPACE
class Q_CORE_EXPORT QNonContiguousByteDevice : public QObject
{
Q_OBJECT
public:
virtual const char *readPointer(qint64 maximumLength, qint64 &len) = 0;
virtual bool advanceReadPointer(qint64 amount) = 0;
virtual bool atEnd() const = 0;
virtual qint64 pos() const { return -1; }
virtual bool reset() = 0;
virtual qint64 size() const = 0;
virtual ~QNonContiguousByteDevice();
protected:
QNonContiguousByteDevice();
Q_SIGNALS:
void readyRead();
void readProgress(qint64 current, qint64 total);
};
class Q_CORE_EXPORT QNonContiguousByteDeviceFactory
{
public:
static QNonContiguousByteDevice *create(QIODevice *device);
static std::shared_ptr<QNonContiguousByteDevice> createShared(QIODevice *device);
static QNonContiguousByteDevice *create(QByteArray *byteArray);
static std::shared_ptr<QNonContiguousByteDevice> createShared(QByteArray *byteArray);
static QNonContiguousByteDevice *create(std::shared_ptr<QRingBuffer> ringBuffer);
static std::shared_ptr<QNonContiguousByteDevice> createShared(std::shared_ptr<QRingBuffer> ringBuffer);
static QIODevice *wrap(QNonContiguousByteDevice *byteDevice);
};
// the actual implementations
//
class QNonContiguousByteDeviceByteArrayImpl : public QNonContiguousByteDevice
{
public:
explicit QNonContiguousByteDeviceByteArrayImpl(QByteArray *ba);
~QNonContiguousByteDeviceByteArrayImpl();
const char *readPointer(qint64 maximumLength, qint64 &len) override;
bool advanceReadPointer(qint64 amount) override;
bool atEnd() const override;
bool reset() override;
qint64 size() const override;
qint64 pos() const override;
protected:
QByteArray *byteArray;
qint64 currentPosition;
};
class QNonContiguousByteDeviceRingBufferImpl : public QNonContiguousByteDevice
{
public:
explicit QNonContiguousByteDeviceRingBufferImpl(std::shared_ptr<QRingBuffer> rb);
~QNonContiguousByteDeviceRingBufferImpl();
const char *readPointer(qint64 maximumLength, qint64 &len) override;
bool advanceReadPointer(qint64 amount) override;
bool atEnd() const override;
bool reset() override;
qint64 size() const override;
qint64 pos() const override;
protected:
std::shared_ptr<QRingBuffer> ringBuffer;
qint64 currentPosition = 0;
};
class QNonContiguousByteDeviceIoDeviceImpl : public QNonContiguousByteDevice
{
Q_OBJECT
public:
explicit QNonContiguousByteDeviceIoDeviceImpl(QIODevice *d);
~QNonContiguousByteDeviceIoDeviceImpl();
const char *readPointer(qint64 maximumLength, qint64 &len) override;
bool advanceReadPointer(qint64 amount) override;
bool atEnd() const override;
bool reset() override;
qint64 size() const override;
qint64 pos() const override;
protected:
QIODevice *device;
QByteArray *currentReadBuffer;
qint64 currentReadBufferSize;
qint64 currentReadBufferAmount;
qint64 currentReadBufferPosition;
qint64 totalAdvancements;
bool eof;
qint64 initialPosition;
};
class QNonContiguousByteDeviceBufferImpl : public QNonContiguousByteDevice
{
Q_OBJECT
public:
explicit QNonContiguousByteDeviceBufferImpl(QBuffer *b);
~QNonContiguousByteDeviceBufferImpl();
const char *readPointer(qint64 maximumLength, qint64 &len) override;
bool advanceReadPointer(qint64 amount) override;
bool atEnd() const override;
bool reset() override;
qint64 size() const override;
protected:
QBuffer *buffer;
QByteArray byteArray;
QNonContiguousByteDeviceByteArrayImpl *arrayImpl;
};
// ... and the reverse thing
class QByteDeviceWrappingIoDevice : public QIODevice
{
public:
explicit QByteDeviceWrappingIoDevice(QNonContiguousByteDevice *bd);
~QByteDeviceWrappingIoDevice();
bool isSequential() const override;
bool atEnd() const override;
bool reset() override;
qint64 size() const override;
protected:
qint64 readData(char *data, qint64 maxSize) override;
qint64 writeData(const char *data, qint64 maxSize) override;
QNonContiguousByteDevice *byteDevice;
};
QT_END_NAMESPACE
#endif
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