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diff --git a/relblobif/ifilestorage.hh b/relblobif/ifilestorage.hh
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+/*
+* This file is part of rasdaman community.
+*
+* Rasdaman community 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 3 of the License, or
+* (at your option) any later version.
+*
+* Rasdaman community 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 rasdaman community.  If not, see <http://www.gnu.org/licenses/>.
+*
+* Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009 Peter Baumann /
+rasdaman GmbH.
+*
+* For more information please see <http://www.rasdaman.org>
+* or contact Peter Baumann via <baumann@rasdaman.com>.
+*/
+/*************************************************************
+ *
+ *
+ * PURPOSE:
+ * The interface used by the file storage modules. 
+ *
+ *
+ * COMMENTS:
+ *
+ ************************************************************/
+
+#ifndef _IFILESTORAGE_H__
+#define _IFILESTORAGE_H__
+
+#include "raslib/error.hh"
+class OId;
+
+// The class is the interface for the file storage modules.
+class IFileStorage 
+{
+	public:
+		// Update the content of a blob. The blob should exist already.
+		virtual void update(const char* data, r_Bytes size, int BlobId) throw (r_Error) = 0;
+		// Store the content of a new blob.
+		virtual void insert(const char* data, r_Bytes size, int BlobId) throw (r_Error) = 0;
+		// Retrive the content of a previously stored blob
+		virtual void retrieve(int BlobId, char** data, r_Bytes *size) throw (r_Error) = 0;
+		// Delete a previously stored blob.
+		virtual void remove(int BlobId) throw (r_Error) = 0;
+
+		//virtual ~IFileStorage() = 0;
+};  // class IFileStorage
+
+#endif  // _IFILESTORAGE_H__