/****************************************************************************
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** Copyright (C) 2016 The Qt Company Ltd.
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** This file is part of the QtCore module of the Qt Toolkit.
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** $QT_BEGIN_LICENSE:LGPL$
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** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
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** Alternatively, this file may be used under the terms of the GNU
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****************************************************************************/

#ifndef QIODEVICE_P_H
#define QIODEVICE_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists for the convenience
// of QIODevice. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include "QtCore/qiodevice.h"
#include "QtCore/qbytearray.h"
#include "QtCore/qobjectdefs.h"
#include "QtCore/qstring.h"
#include "private/qringbuffer_p.h"
#ifndef QT_NO_QOBJECT
#include "private/qobject_p.h"
#endif

QT_BEGIN_NAMESPACE

#ifndef QIODEVICE_BUFFERSIZE
#define QIODEVICE_BUFFERSIZE Q_INT64_C(16384)
#endif

Q_CORE_EXPORT int qt_subtract_from_timeout(int timeout, int elapsed);

class Q_CORE_EXPORT QIODevicePrivate
#ifndef QT_NO_QOBJECT
    : public QObjectPrivate
#endif
{
    Q_DECLARE_PUBLIC(QIODevice)

public:
    QIODevicePrivate();
    virtual ~QIODevicePrivate();

    QIODevice::OpenMode openMode;
    QString errorString;

    QRingBuffer buffer;
    qint64 pos;
    qint64 devicePos;
    qint64 transactionPos;
    bool transactionStarted;
    bool baseReadLineDataCalled;

    virtual bool putCharHelper(char c);

    enum AccessMode {
        Unset,
        Sequential,
        RandomAccess
    };
    mutable AccessMode accessMode;
    inline bool isSequential() const
    {
        if (accessMode == Unset)
            accessMode = q_func()->isSequential() ? Sequential : RandomAccess;
        return accessMode == Sequential;
    }

    inline bool isBufferEmpty() const
    {
        return buffer.isEmpty() || (transactionStarted && isSequential()
                                    && transactionPos == buffer.size());
    }
    void seekBuffer(qint64 newPos);

    virtual qint64 peek(char *data, qint64 maxSize);
    virtual QByteArray peek(qint64 maxSize);

#ifdef QT_NO_QOBJECT
    QIODevice *q_ptr;
#endif
};

QT_END_NAMESPACE

#endif // QIODEVICE_P_H