Line data    Source code

       1             : /*
       2             :   interface/dataprovider.h - Interface for data sources
       3             :   Copyright (C) 2003 Klarälvdalens Datakonsult AB
       4             : 
       5             :   This file is part of GPGME++.
       6             : 
       7             :   GPGME++ is free software; you can redistribute it and/or
       8             :   modify it under the terms of the GNU Library General Public
       9             :   License as published by the Free Software Foundation; either
      10             :   version 2 of the License, or (at your option) any later version.
      11             : 
      12             :   GPGME++ is distributed in the hope that it will be useful,
      13             :   but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      15             :   GNU Library General Public License for more details.
      16             : 
      17             :   You should have received a copy of the GNU Library General Public License
      18             :   along with GPGME++; see the file COPYING.LIB.  If not, write to the
      19             :   Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
      20             :   Boston, MA 02110-1301, USA.
      21             : */
      22             : 
      23             : #ifndef __GPGMEPP_INTERFACES_DATAPROVIDER_H__
      24             : #define __GPGMEPP_INTERFACES_DATAPROVIDER_H__
      25             : 
      26             : #include <sys/types.h>
      27             : 
      28             : #include "gpgmepp_export.h"
      29             : 
      30             : #include <gpg-error.h>
      31             : 
      32             : namespace GpgME
      33             : {
      34             : 
      35          64 : class GPGMEPP_EXPORT DataProvider
      36             : {
      37             : public:
      38          64 :     virtual ~DataProvider() {}
      39             : 
      40             :     enum Operation {
      41             :         Read, Write, Seek, Release
      42             :     };
      43             :     virtual bool isSupported(Operation op) const = 0;
      44             : 
      45             :     virtual ssize_t read(void   *buffer, size_t bufSize) = 0;
      46             :     virtual ssize_t write(const void *buffer, size_t bufSize) = 0;
      47             :     virtual off_t seek(off_t offset, int whence) = 0;
      48             :     virtual void release() = 0;
      49             : };
      50             : 
      51             : } // namespace GpgME
      52             : 
      53             : #endif // __GPGMEPP_INTERFACES_DATAPROVIDER_H__