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hide_file.hpp
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/*********************************************************************/
// dar - disk archive - a backup/restoration program
// Copyright (C) 2002-2025 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// to contact the author, see the AUTHOR file
/*********************************************************************/
#ifndef HIDE_FILE_HPP
#define HIDE_FILE_HPP
#include "../my_config.h"
#include <vector>
#include "libdar.hpp"
#include "generic_file.hpp"
using namespace libdar;
using namespace std;
class hide_file : public generic_file
{
public:
hide_file(generic_file &f);
hide_file(const hide_file & ref) = default;
hide_file & operator = (const hide_file & ref) = default;
~hide_file() = default;
virtual bool skippable(skippability direction, const infinint & amount) override { return true; };
virtual bool skip(const infinint & pos) override;
virtual bool skip_to_eof() override;
virtual bool skip_relative(S_I x) override;
virtual bool truncatable(const infinint & pos) const override { return false; };
virtual infinint get_position() const override;
protected:
struct partie
{
infinint debut, longueur; // debut is the offset in ref file
infinint offset; // offset in the resulting file
};
vector <partie> morceau;
generic_file *ref;
virtual void inherited_read_ahead(const infinint & amount) override { ref->read_ahead(amount); };
virtual U_I inherited_read(char *a, U_I size) override;
virtual void inherited_write(const char *a, size_t size) override;
virtual void inherited_truncate(const infinint & pos) override { throw Efeature("truncate a hide file"); };
virtual void inherited_sync_write() override {};
virtual void inherited_flush_read() override {};
virtual void inherited_terminate() override {};
virtual void fill_morceau() = 0;
// the inherited classes have with this method
// to fill the "morceau" variable that defines
// the portions
private:
U_I pos_index;
infinint pos_relicat;
bool is_init;
void init() const;
};
#endif
libdar::generic_file
this is the interface class from which all other data transfer classes inherit
Definition generic_file.hpp:77
libdar::generic_file::inherited_sync_write
virtual void inherited_sync_write()=0
write down any pending data
libdar::generic_file::generic_file
generic_file(gf_mode m)
main constructor
Definition generic_file.hpp:80
libdar::generic_file::get_position
virtual infinint get_position() const =0
get the current read/write position
libdar::generic_file::skip_to_eof
virtual bool skip_to_eof()=0
skip to the end of file
libdar::generic_file::inherited_terminate
virtual void inherited_terminate()=0
destructor-like call, except that it is allowed to throw exceptions
libdar::generic_file::inherited_flush_read
virtual void inherited_flush_read()=0
reset internal engine, flush caches in order to read the data at current position
generic_file.hpp
class generic_file is defined here as well as class fichier
libdar.hpp
the main file of the libdar API definitions
my_config.h
include macro defined by the configure script and some specific additional ones
libdar
libdar namespace encapsulate all libdar symbols
Definition archive.hpp:47