delta_sig_block_size.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 DELTA_SIG_BLOCK_SIZE_HPP
#define DELTA_SIG_BLOCK_SIZE_HPP
 
#include "../my_config.h"
 
extern "C"
{
} // end extern "C"
 
#include "infinint.hpp"
 
#ifndef RS_DEFAULT_BLOCK_LEN
#define RS_DEFAULT_BLOCK_LEN 2048
#endif
 
namespace libdar
{
 
 
 
    struct delta_sig_block_size
    {
    enum fs_function_t
    {
        fixed,      
        linear,     
        log2,       
        root2,      
        root3       
        // square2 (inexact naming) -> use root2 since release 2.8.0, same behavior just renaming
        // square3 (inexact naming) -> use root3 since release 2.8.0, same behavior just renaming
    };
 
    fs_function_t fs_function; 
    infinint multiplier; 
    infinint divisor;    
    U_I min_block_len;   
    U_I max_block_len;   
 
        // definitions to help using the struct
 
    delta_sig_block_size() { reset(); }; 
    delta_sig_block_size(const delta_sig_block_size & ref) = default;
    delta_sig_block_size(delta_sig_block_size && ref) noexcept = default;
    delta_sig_block_size & operator = (const delta_sig_block_size & ref) = default;
    delta_sig_block_size & operator = (delta_sig_block_size && ref) noexcept = default;
    ~delta_sig_block_size() = default;
 
    bool operator == (const delta_sig_block_size & ref) const;
 
    void reset();
 
    bool equals_default() { return (*this) == delta_sig_block_size(); };
 
    void check() const;
 
 
    U_I calculate(const infinint & filesize) const;
 
    };
 
 
} // end of namespace
 
#endif