/****************************************************************************
**
** 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_H
#define QFILEDEVICE_H

#include <QtCore/qiodevice.h>
#include <QtCore/qstring.h>

QT_BEGIN_NAMESPACE

class QFileDevicePrivate;

class Q_CORE_EXPORT QFileDevice : public QIODevice
{
#ifndef QT_NO_QOBJECT
    Q_OBJECT
#endif
    Q_DECLARE_PRIVATE(QFileDevice)

public:
    enum FileError {
        NoError = 0,
        ReadError = 1,
        WriteError = 2,
        FatalError = 3,
        ResourceError = 4,
        OpenError = 5,
        AbortError = 6,
        TimeOutError = 7,
        UnspecifiedError = 8,
        RemoveError = 9,
        RenameError = 10,
        PositionError = 11,
        ResizeError = 12,
        PermissionsError = 13,
        CopyError = 14
    };

    enum Permission {
        ReadOwner = 0x4000, WriteOwner = 0x2000, ExeOwner = 0x1000,
        ReadUser  = 0x0400, WriteUser  = 0x0200, ExeUser  = 0x0100,
        ReadGroup = 0x0040, WriteGroup = 0x0020, ExeGroup = 0x0010,
        ReadOther = 0x0004, WriteOther = 0x0002, ExeOther = 0x0001
    };
    Q_DECLARE_FLAGS(Permissions, Permission)

    enum FileHandleFlag {
        AutoCloseHandle = 0x0001,
        DontCloseHandle = 0
    };
    Q_DECLARE_FLAGS(FileHandleFlags, FileHandleFlag)

    ~QFileDevice();

    FileError error() const;
    void unsetError();

    virtual void close() Q_DECL_OVERRIDE;

    bool isSequential() const Q_DECL_OVERRIDE;

    int handle() const;
    virtual QString fileName() const;

    qint64 pos() const Q_DECL_OVERRIDE;
    bool seek(qint64 offset) Q_DECL_OVERRIDE;
    bool atEnd() const Q_DECL_OVERRIDE;
    bool flush();

    qint64 size() const Q_DECL_OVERRIDE;

    virtual bool resize(qint64 sz);
    virtual Permissions permissions() const;
    virtual bool setPermissions(Permissions permissionSpec);

    // ### Qt 6: rename to MemoryMapFlag & make it a QFlags
    enum MemoryMapFlags {
        NoOptions = 0,
        MapPrivateOption = 0x0001
    };

    uchar *map(qint64 offset, qint64 size, MemoryMapFlags flags = NoOptions);
    bool unmap(uchar *address);

protected:
    QFileDevice();
#ifdef QT_NO_QOBJECT
    QFileDevice(QFileDevicePrivate &dd);
#else
    explicit QFileDevice(QObject *parent);
    QFileDevice(QFileDevicePrivate &dd, QObject *parent = Q_NULLPTR);
#endif

    qint64 readData(char *data, qint64 maxlen) Q_DECL_OVERRIDE;
    qint64 writeData(const char *data, qint64 len) Q_DECL_OVERRIDE;
    qint64 readLineData(char *data, qint64 maxlen) Q_DECL_OVERRIDE;

private:
    Q_DISABLE_COPY(QFileDevice)
};

Q_DECLARE_OPERATORS_FOR_FLAGS(QFileDevice::Permissions)

QT_END_NAMESPACE

#endif // QFILEDEVICE_H
