xz_module.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 XZ_MODULE_HPP
#define XZ_MODULE_HPP
 
extern "C"
{
#if HAVE_LZMA_H
#include <lzma.h>
#endif
}
 
#include "../my_config.h"
 
#include "compress_module.hpp"
#include "infinint.hpp"
 
namespace libdar
{

 
    class xz_module: public compress_module
    {
    public:
    xz_module(U_I compression_level = 9);
    xz_module(const xz_module & ref) { setup(ref.level); };
    xz_module(xz_module && ref) noexcept = default;
    xz_module & operator = (const xz_module & ref) { end_process(); setup(ref.level); return *this; };
    xz_module & operator = (xz_module && ref) noexcept = default;
    virtual ~xz_module() { end_process(); };
 
        // inherited from compress_module interface
 
    virtual compression get_algo() const override { return compression::xz; };
 
    virtual U_I get_max_compressing_size() const override;
 
    virtual U_I get_min_size_to_compress(U_I clear_size) const override;
 
    virtual U_I compress_data(const char *normal,
                   const U_I normal_size,
                   char *zip_buf,
                   U_I zip_buf_size) const override;
 
    virtual U_I uncompress_data(const char *zip_buf,
                     const U_I zip_buf_size,
                     char *normal,
                     U_I normal_size) const override;
 
 
    virtual std::unique_ptr<compress_module> clone() const override;
 
    private:
    U_I level;
#if LIBLZMA_AVAILABLE
    mutable lzma_stream lzma_str;
#endif
 
    void setup(U_I compression_level);
    void init_decompr() const;
    void init_compr() const;
    void end_process() const;
    };

 
} // end of namespace
 
#endif