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diff --git a/libkdenetwork/gpgmepp/interfaces/dataprovider.h b/libkdenetwork/gpgmepp/interfaces/dataprovider.h
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+++ b/libkdenetwork/gpgmepp/interfaces/dataprovider.h
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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__