/usr/include/dar/memory_file.hpp is in libdar-dev 2.5.3-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// dar - disk archive - a backup/restoration program
// Copyright (C) 2002-2052 Denis Corbin
//
// This program 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.
//
// This program 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 this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
// to contact the author : http://dar.linux.free.fr/email.html
/*********************************************************************/
/// \file memory_file.hpp
/// \brief Memory_file is a generic_file class that only uses virtual memory
/// \ingroup Private
#ifndef MEMORY_FILE_HPP
#define MEMORY_FILE_HPP
#include "/usr/include/dar/generic_file.hpp"
#include "/usr/include/dar/storage.hpp"
namespace libdar
{
/// \addtogroup Private
/// @{
class memory_file : public generic_file
{
public:
/// Constructors & Destructor
memory_file() : generic_file(gf_read_write), data(0) { position = 0; };
// memory_storage specific methods
void reset() { if(is_terminated()) throw SRC_BUG; position = 0; data = storage(0); };
infinint size() const { return data.size(); };
// virtual method inherited from generic_file
bool skippable(skippability direction, const infinint & amount) { return true; };
bool skip(const infinint & pos);
bool skip_to_eof();
bool skip_relative(S_I x);
infinint get_position() const { if(is_terminated()) throw SRC_BUG; return position; };
protected:
// virtual method inherited from generic_file
void inherited_read_ahead(const infinint & amount) {}; // no optimization can be done here, we rely on the OS here
U_I inherited_read(char *a, U_I size);
void inherited_write(const char *a, U_I size);
void inherited_sync_write() {};
void inherited_flush_read() {};
void inherited_terminate() {};
private:
storage data;
infinint position;
};
/// @}
} // end of namespace
#endif
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