/****************************************************************************
**
** Copyright (C) 2016 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 QFILEDEVICE_P_H
#define QFILEDEVICE_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 "private/qiodevice_p.h"

QT_BEGIN_NAMESPACE

class QAbstractFileEngine;
class QFSFileEngine;

class QFileDevicePrivate : public QIODevicePrivate
{
    Q_DECLARE_PUBLIC(QFileDevice)
protected:
    QFileDevicePrivate();
    ~QFileDevicePrivate();

    virtual QAbstractFileEngine *engine() const;

    inline bool ensureFlushed() const;

    bool putCharHelper(char c) Q_DECL_OVERRIDE;

    void setError(QFileDevice::FileError err);
    void setError(QFileDevice::FileError err, const QString &errorString);
    void setError(QFileDevice::FileError err, int errNum);

    mutable QAbstractFileEngine *fileEngine;
    mutable qint64 cachedSize;

    QFileDevice::FileHandleFlags handleFlags;
    QFileDevice::FileError error;

    bool lastWasWrite;
};

inline bool QFileDevicePrivate::ensureFlushed() const
{
    // This function ensures that the write buffer has been flushed (const
    // because certain const functions need to call it.
    if (lastWasWrite) {
        const_cast<QFileDevicePrivate *>(this)->lastWasWrite = false;
        if (!const_cast<QFileDevice *>(q_func())->flush())
            return false;
    }
    return true;
}

QT_END_NAMESPACE

#endif // QFILEDEVICE_P_H
