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/*********************************************************************/
// dar - disk archive - a backup/restoration program
// Copyright (C) 2002-2020 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 : http://dar.linux.free.fr/email.html
/*********************************************************************/
/// \file scrambler.hpp
/// \brief contains the definition of the scrambler class, a very weak encryption scheme
/// \ingroup Private
#ifndef SCRAMBLER_HPP
#define SCRAMBLER_HPP
#include "../my_config.h"
#include <string>
#include "infinint.hpp"
#include "generic_file.hpp"
#include "erreurs.hpp"
#include "secu_string.hpp"
namespace libdar
{
/// \addtogroup Private
/// @{
/// \brief scrambler is a very weak encryption scheme
class scrambler : public generic_file
{
public:
scrambler(const secu_string & pass, generic_file & hidden_side);
scrambler(const scrambler & ref) = delete;
scrambler(scrambler && ref) noexcept = delete;
scrambler & operator = (const scrambler & ref) = delete;
scrambler & operator = (scrambler && ref) noexcept = delete;
~scrambler() { if(buffer != nullptr) delete [] buffer; };
virtual bool skippable(skippability direction, const infinint & amount) override { return ref->skippable(direction, amount); };
virtual bool skip(const infinint & pos) override { if(ref == nullptr) throw SRC_BUG; return ref->skip(pos); };
virtual bool skip_to_eof() override { if(ref==nullptr) throw SRC_BUG; return ref->skip_to_eof(); };
virtual bool skip_relative(S_I x) override { if(ref == nullptr) throw SRC_BUG; return ref->skip_relative(x); };
virtual infinint get_position() const override { if(ref == nullptr) throw SRC_BUG; return ref->get_position(); };
protected:
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, U_I size) override;
virtual void inherited_sync_write() override {}; // nothing to do
virtual void inherited_flush_read() override {}; // nothing to do
virtual void inherited_terminate() override {}; // nothing to do
private:
secu_string key;
U_I len;
generic_file *ref;
unsigned char *buffer;
U_I buf_size;
};
/// @}
} // end of namespace
#endif
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