eols.hpp

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/*********************************************************************/
// dar - disk archive - a backup/restoration program
// Copyright (C) 2002-2026 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 EOLS_HPP
#define EOLS_HPP
 
#include "../my_config.h"
 
#include <string>
#include <deque>
 
#include "integers.hpp"
 
namespace libdar
{


 
    class eols
    {
    public:
    eols(const std::deque<std::string> & end_sequences);
 
    eols(const eols & ref) { copy_from(ref); };
    eols(eols && ref) noexcept = default;
    eols & operator = (const eols & ref) { copy_from(ref); return *this; };
    eols & operator = (eols && ref) = default;
    ~eols() = default;

    void add_sequence(const std::string & seq);

    void reset_detection() const;


    bool eol_reached(char next_read_byte,
             U_I & eol_sequence_length,
             U_I & after_eol_read_bytes) const;
 
    private:
    class in_progress
    {
    public:
        in_progress(const std::string & val): ref(val) { reset(); };
 
        // methods
        void reset() const { next_to_match = ref.begin(); bypass = false; passed = 0; larger = false; };
        bool match(char next_read_byte) const;
        U_I progression() const; 
        bool set_bypass(U_I prog) const; 
        void set_larger() const { larger = true; };
        bool has_matched() const { return next_to_match == ref.end(); };
 
        // fields
        std::string ref;                                   
        mutable std::string::const_iterator next_to_match; 
        mutable bool bypass;                               
        mutable U_I passed;                                
        mutable bool larger;                               
    };
 
    std::deque<in_progress> eols_curs;
    mutable U_I ref_progression;


    bool bypass_or_larger(U_I prog) const;
    bool all_bypassed_or_matched() const;
    bool find_larger_match(U_I & seq_length, U_I & read_after_eol) const;
    void copy_from(const eols & ref);
    };

 
} // end of namespace
 
#endif