Disk ARchive: lz4_module.hpp Source File

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lz4_module.hpp
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1/*********************************************************************/
2// dar - disk archive - a backup/restoration program
3// Copyright (C) 2002-2026 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
34
35#ifndef LZ4_MODULE_HPP
36#define LZ4_MODULE_HPP
37
38extern "C"
39{
40#if HAVE_LZ4_H
41#include <lz4.h>
42#endif
43}
44
45#include "../my_config.h"
46
47#include "compress_module.hpp"
48
49namespace libdar
50{
51
54
55 class lz4_module: public compress_module
56 {
57 public:
58 lz4_module(U_I compression_level = 9);
59 lz4_module(const lz4_module & ref);
60 lz4_module(lz4_module && ref) noexcept;
61 lz4_module & operator = (const lz4_module & ref);
62 lz4_module & operator = (lz4_module && ref) noexcept;
63 virtual ~lz4_module() noexcept;
64
65 // inherited from compress_module interface
66
67 virtual compression get_algo() const override { return compression::lz4; };
68
69 virtual U_I get_max_compressing_size() const override;
70
71 virtual U_I get_min_size_to_compress(U_I clear_size) const override;
72
73 virtual U_I compress_data(const char *normal,
74 const U_I normal_size,
75 char *zip_buf,
76 U_I zip_buf_size) const override;
77
78 virtual U_I uncompress_data(const char *zip_buf,
79 const U_I zip_buf_size,
80 char *normal,
81 U_I normal_size) const override;
82
83
84 virtual std::unique_ptr<compress_module> clone() const override;
85
86 private:
87 U_I acceleration;
88 char *state;
89
90 };
92
93} // end of namespace
94
95#endif
compress_module.hpp
provides abstracted interface of per-block compression/decompression
libdar::compression
compression
the different compression algorithm available
Definition compression.hpp:46
libdar::compression::lz4
@ lz4
lz4 (streamed)
Definition compression.hpp:55
my_config.h
include macro defined by the configure script and some specific additional ones
libdar
libdar namespace encapsulate all libdar symbols
Definition archive.hpp:47