Disk ARchive 2.7.16
Full featured and portable backup and archiving tool
Loading...
Searching...
No Matches
xz_module.hpp
Go to the documentation of this file.
1/*********************************************************************/
2// dar - disk archive - a backup/restoration program
3// Copyright (C) 2002-2024 Denis Corbin
4//
5// This program is free software; you can redistribute it and/or
6// modify it under the terms of the GNU General Public License
7// as published by the Free Software Foundation; either version 2
8// of the License, or (at your option) any later version.
9//
10// This program is distributed in the hope that it will be useful,
11// but WITHOUT ANY WARRANTY; without even the implied warranty of
12// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13// GNU General Public License for more details.
14//
15// You should have received a copy of the GNU General Public License
16// along with this program; if not, write to the Free Software
17// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18//
19// to contact the author, see the AUTHOR file
20/*********************************************************************/
21
26
27#ifndef XZ_MODULE_HPP
28#define XZ_MODULE_HPP
29
30extern "C"
31{
32#if HAVE_LZMA_H
33#include <lzma.h>
34#endif
35}
36
37#include "../my_config.h"
38
39#include "compress_module.hpp"
40#include "infinint.hpp"
41
42namespace libdar
43{
44
47
48 class xz_module: public compress_module
49 {
50 public:
51 xz_module(U_I compression_level = 9);
52 xz_module(const xz_module & ref) { setup(ref.level); };
53 xz_module(xz_module && ref) noexcept = default;
54 xz_module & operator = (const xz_module & ref) { end_process(); setup(ref.level); return *this; };
55 xz_module & operator = (xz_module && ref) noexcept = default;
56 virtual ~xz_module() { end_process(); };
57
58 // inherited from compress_module interface
59
60 virtual compression get_algo() const override { return compression::xz; };
61
62 virtual U_I get_max_compressing_size() const override;
63
64 virtual U_I get_min_size_to_compress(U_I clear_size) const override;
65
66 virtual U_I compress_data(const char *normal,
67 const U_I normal_size,
68 char *zip_buf,
69 U_I zip_buf_size) const override;
70
71 virtual U_I uncompress_data(const char *zip_buf,
72 const U_I zip_buf_size,
73 char *normal,
74 U_I normal_size) const override;
75
76
77 virtual std::unique_ptr<compress_module> clone() const override;
78
79 private:
80 U_I level;
81#if LIBLZMA_AVAILABLE
82 mutable lzma_stream lzma_str;
83#endif
84
85 void setup(U_I compression_level);
86 void init_decompr() const;
87 void init_compr() const;
88 void end_process() const;
89 };
90
92
93} // end of namespace
94
95#endif
provides abstracted interface of per-block compression/decompression
@ xz
lzma compression (streamed)
switch module to limitint (32 ou 64 bits integers) or infinint
include macro defined by the configure script and some specific additional ones
libdar namespace encapsulate all libdar symbols
Definition archive.hpp:47