/*

  interface/dataprovider.h - Interface for data sources

  Copyright (C) 2003 Klarälvdalens Datakonsult AB

  2016 Bundesamt für Sicherheit in der Informationstechnik

  Software engineering by Intevation GmbH

  This file is part of GPGME++.

  GPGME++ is free software; you can redistribute it and/or

  modify it under the terms of the GNU Library General Public

  License as published by the Free Software Foundation; either

  version 2 of the License, or (at your option) any later version.

  GPGME++ 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 Library General Public License for more details.

  You should have received a copy of the GNU Library General Public License

  along with GPGME++; see the file COPYING.LIB.  If not, write to the

  Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

  Boston, MA 02110-1301, USA.

*/

#ifndef __GPGMEPP_INTERFACES_DATAPROVIDER_H__

#define __GPGMEPP_INTERFACES_DATAPROVIDER_H__

#include <sys/types.h>

#include "gpgmepp_export.h"

#include <gpg-error.h>

namespace GpgME

{

class GPGMEPP_EXPORT DataProvider

{

public:

    virtual ~DataProvider() {}

    enum Operation {

        Read, Write, Seek, Release

    };

    virtual bool isSupported(Operation op) const = 0;

    virtual ssize_t read(void   *buffer, size_t bufSize) = 0;

    virtual ssize_t write(const void *buffer, size_t bufSize) = 0;

    virtual off_t seek(off_t offset, int whence) = 0;

    virtual void release() = 0;

};

} // namespace GpgME

#endif // __GPGMEPP_INTERFACES_DATAPROVIDER_H__