referencedevice.hpp

/* Copyright (c) 2014-2015, The Nuria Project
 * The NuriaProject Framework is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the License,
 * or (at your option) any later version.
 * 
 * The NuriaProject Framework is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with The NuriaProject Framework.
 * If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef NURIA_REFERENCEDEVICE_HPP
#define NURIA_REFERENCEDEVICE_HPP

#include <QIODevice>
#include "essentials.hpp"

namespace Nuria {

class ReferenceDevicePrivate;

class NURIA_CORE_EXPORT ReferenceDevice : public QIODevice {
        Q_OBJECT
public:
        
        explicit ReferenceDevice (QIODevice *referencedDevice, QObject *parent = 0);
        
        ~ReferenceDevice () override;
        
        QIODevice *referencedDevice () const;
        
        qint64 rangeBegin () const;
        
        qint64 rangeEnd () const;
        
        void setRange (qint64 begin, qint64 end = -1);
        
        void extendRange (qint64 bytes);
        
        // 
        bool isSequential () const override;
        bool open (OpenMode mode) override;
        void close () override;
        qint64 pos () const override;
        qint64 size () const override;
        bool seek (qint64 pos) override;
        bool atEnd () const override;
        bool reset () override;
        qint64 bytesAvailable () const override;
        
protected:
        qint64 readData(char *data, qint64 maxlen);
        qint64 writeData(const char *data, qint64 len);
        
private:
        void referencedDeviceDestroyed ();
        void autoExtendRange ();
        
        ReferenceDevicePrivate *d_ptr;
        
};

}

#endif // NURIA_REFERENCEDEVICE_HPP