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diff --git a/lang/cpp/src/interfaces/dataprovider.h b/lang/cpp/src/interfaces/dataprovider.h
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+++ b/lang/cpp/src/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 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__