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wrapperlib.hpp
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1/*********************************************************************/
2// dar - disk archive - a backup/restoration program
3// Copyright (C) 2002-2025 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
29
30#ifndef WRAPPERLIB_HPP
31#define WRAPPERLIB_HPP
32
33#include "../my_config.h"
34
35extern "C"
36{
37#if HAVE_ZLIB_H && LIBZ_AVAILABLE
38#include <zlib.h>
39#endif
40
41#if HAVE_BZLIB_H && LIBBZ2_AVAILABLE
42#include <bzlib.h>
43#endif
44
45#if HAVE_LZMA_H && LIBLZMA_AVAILABLE
46#include <lzma.h>
47#endif
48} // end extern "C"
49
50#include "integers.hpp"
51
52namespace libdar
53{
54
57
58 const int WR_OK = 0; // operation successful
59 const int WR_MEM_ERROR = 1; // lack of memory
60 const int WR_VERSION_ERROR = 2; // incompatible version of the compression library with the one expected by libdar
61 const int WR_STREAM_ERROR = 3; // not a valid compression level, incoherent data provided to the compression library
62 const int WR_DATA_ERROR = 4; // data has been corrupted
63 const int WR_NO_FLUSH = 5; // parameter to let the compression library decide at which time to output data (from zlib Z_NO_FLUSH, no other way is done in libdar)
64 const int WR_BUF_ERROR = 6; // no possible work to perform for the request action without additional provided data/or storage space to the compression library
65 const int WR_STREAM_END = 7; // end of compressed data met
66 const int WR_FINISH = 8; // parameter requiring the compression library to cleanly stop the running operation
67
68 enum wrapperlib_mode { zlib_mode, bzlib_mode, xz_mode };
69
71
74 class wrapperlib
75 {
76 public:
77 wrapperlib(wrapperlib_mode mode);
78 wrapperlib(const wrapperlib & ref) = delete;
79 wrapperlib(wrapperlib && ref) noexcept = delete;
80 wrapperlib & operator = (const wrapperlib & ref) = delete;
81 wrapperlib & operator = (wrapperlib && ref) noexcept = delete;
82 ~wrapperlib();
83
84 void set_next_in(const char *x) { return (this->*x_set_next_in)(x); };
85 void set_avail_in(U_I x) { return (this->*x_set_avail_in)(x); };
86 U_I get_avail_in() const { return (this->*x_get_avail_in)(); };
87 U_64 get_total_in() const { return (this->*x_get_total_in)(); };
88
89 void set_next_out(char *x) { return (this->*x_set_next_out)(x); };
90 char *get_next_out() const { return (this->*x_get_next_out)(); };
91 void set_avail_out(U_I x) { return (this->*x_set_avail_out)(x); };
92 U_I get_avail_out() const { return (this->*x_get_avail_out)(); };
93 U_64 get_total_out() const { return (this->*x_get_total_out)(); };
94
95 S_I compressInit(U_I compression_level) { level = compression_level; return (this->*x_compressInit)(compression_level); };
96 S_I decompressInit() { return (this->*x_decompressInit)(); };
97 S_I compressEnd() { return (this->*x_compressEnd)(); };
98 S_I decompressEnd() { return (this->*x_decompressEnd)(); };
99 S_I compress(S_I flag) { return (this->*x_compress)(flag); };
100 S_I decompress(S_I flag) { return (this->*x_decompress)(flag);};
101 S_I compressReset();
102 S_I decompressReset();
103
104 private:
105#if LIBZ_AVAILABLE
106 z_stream *z_ptr;
107#endif
108#if LIBBZ2_AVAILABLE
109 bz_stream *bz_ptr;
110#endif
111#if LIBLZMA_AVAILABLE
112 lzma_stream *lzma_ptr;
113#endif
114
115 S_I level;
116
117 void (wrapperlib::*x_set_next_in)(const char *x);
118 void (wrapperlib::*x_set_avail_in)(U_I x);
119 U_I (wrapperlib::*x_get_avail_in)() const;
120 U_64 (wrapperlib::*x_get_total_in)() const;
121
122 void (wrapperlib::*x_set_next_out)(char *x);
123 char *(wrapperlib::*x_get_next_out)() const;
124 void (wrapperlib::*x_set_avail_out)(U_I x);
125 U_I (wrapperlib::*x_get_avail_out)() const;
126 U_64 (wrapperlib::*x_get_total_out)() const;
127
128 S_I (wrapperlib::*x_compressInit)(U_I compression_level);
129 S_I (wrapperlib::*x_decompressInit)();
130 S_I (wrapperlib::*x_compressEnd)();
131 S_I (wrapperlib::*x_decompressEnd)();
132 S_I (wrapperlib::*x_compress)(S_I flag);
133 S_I (wrapperlib::*x_decompress)(S_I flag);
134
135
136 // set of routines for zlib
137#if LIBZ_AVAILABLE
138 S_I z_compressInit(U_I compression_level);
139 S_I z_decompressInit();
140 S_I z_compressEnd();
141 S_I z_decompressEnd();
142 S_I z_compress(S_I flag);
143 S_I z_decompress(S_I flag);
144 void z_set_next_in(const char *x);
145 void z_set_avail_in(U_I x);
146 U_I z_get_avail_in() const;
147 U_64 z_get_total_in() const;
148 void z_set_next_out(char *x);
149 char *z_get_next_out() const;
150 void z_set_avail_out(U_I x);
151 U_I z_get_avail_out() const;
152 U_64 z_get_total_out() const;
153#endif
154
155 // set of routines for bzlib
156#if LIBBZ2_AVAILABLE
157 S_I bz_compressInit(U_I compression_level);
158 S_I bz_decompressInit();
159 S_I bz_compressEnd();
160 S_I bz_decompressEnd();
161 S_I bz_compress(S_I flag);
162 S_I bz_decompress(S_I flag);
163 void bz_set_next_in(const char *x);
164 void bz_set_avail_in(U_I x);
165 U_I bz_get_avail_in() const;
166 U_64 bz_get_total_in() const;
167 void bz_set_next_out(char *x);
168 char *bz_get_next_out() const;
169 void bz_set_avail_out(U_I x);
170 U_I bz_get_avail_out() const;
171 U_64 bz_get_total_out() const;
172#endif
173
174 // set of routines for liblzma
175#if LIBLZMA_AVAILABLE
176 S_I lzma_compressInit(U_I compression_level);
177 S_I lzma_decompressInit();
178 S_I lzma_end();
179 S_I lzma_encode(S_I flag);
180 void lzma_set_next_in(const char *x);
181 void lzma_set_avail_in(U_I x);
182 U_I lzma_get_avail_in() const;
183 U_64 lzma_get_total_in() const;
184 void lzma_set_next_out(char *x);
185 char *lzma_get_next_out() const;
186 void lzma_set_avail_out(U_I x);
187 U_I lzma_get_avail_out() const;
188 U_64 lzma_get_total_out() const;
189#endif
190
191 };
192
194
195} // end of namespace
196
197#endif
libdar::wrapperlib
this class encapsulates calls to libz or libbz2
Definition wrapperlib.hpp:75
integers.hpp
are defined here basic integer types that tend to be portable
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