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diff --git a/conversion/png.hh b/conversion/png.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>.
+/
+/**
+ * INCLUDE: png.hh
+ *
+ * MODULE:  conversion
+ *
+ * CLASSES: r_Conv_PNG
+ *
+ * COMMENTS:
+ *
+ * Provides interface to convert data to other formats.
+ *
+*/
+
+#ifndef _R_CONV_PNG_HH_
+#define _R_CONV_PNG_HH_
+
+#include "conversion/convertor.hh"
+
+
+
+//@ManMemo: Module {\bf conversion}
+
+/*@Doc:
+  PNG convertor class.
+
+  This class doesn't have parameters.
+*/
+
+class r_Conv_PNG : public r_Convert_Memory
+{
+  public:
+  /// constructor using an r_Type object
+  r_Conv_PNG( const char *src, const r_Minterval &interv, const r_Type *tp ) throw(r_Error);
+  /// constructor using convert_type_e shortcut
+  r_Conv_PNG( const char *src, const r_Minterval &interv, int tp ) throw(r_Error);
+  /// destructor
+  ~r_Conv_PNG( void );
+
+  /// convert to PNG
+  virtual r_convDesc &convertTo( const char *options=NULL ) throw(r_Error);
+  /// convert from PNG
+  virtual r_convDesc &convertFrom( const char *options=NULL ) throw(r_Error);
+  /// cloning
+  virtual r_Convertor *clone( void ) const;
+  /// identification
+  virtual const char *get_name( void ) const;
+  virtual r_Data_Format get_data_format( void ) const;
+
+  private:
+  /// names
+  static const char *name_InfoKey;
+  static const char *name_InfoText;
+  static const char *method_convertTo;
+  static const char *method_convertFrom;
+};
+
+#endif