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+/* interface/dataprovider.h - Interface for data sources
+ Copyright (C) 2003 Klarälvdalens Datakonsult AB
+
+ This file is part of GPGME++.
+
+ GPGME++ is free software; you can redistribute it and/or modify it
+ under the terms of the GNU 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
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with GPGME; 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 <kdepimmacros.h>
+
+namespace GpgME {
+
+ class KDE_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__