Disk ARchive 2.7.16
Full featured and portable backup and archiving tool
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int_tools.hpp
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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 INT_TOOLS_HPP
28#define INT_TOOLS_HPP
29
30#include "../my_config.h"
31
32#include "integers.hpp"
33
34namespace libdar
35{
36
39
40 using int_tools_bitfield = unsigned char[8];
41
42 extern void int_tools_swap_bytes(unsigned char &a, unsigned char &b);
43 extern void int_tools_swap_bytes(unsigned char *a, U_I size);
44 extern void int_tools_expand_byte(unsigned char a, int_tools_bitfield &bit);
45 extern void int_tools_contract_byte(const int_tools_bitfield &b, unsigned char & a);
46
47 // integer (agregates) manipulations
48 // argument must be a regular interger (a bit field).
49 template <class T> extern T int_tools_rotate_right_one_bit(T v)
50 {
51 bool retenue = (v & 1) != 0;
52
53 v >>= 1;
54 if(retenue)
55 v |= T(1) << (sizeof(v)*8 - 1);
56
57 return v;
58 }
59
60 template <class T> extern T int_tools_maxof_aggregate(T unused) { unused = 0; unused = ~unused; unused = unused > 0 ? unused : ~int_tools_rotate_right_one_bit(T(1)); return unused; }
61
62 template <class B> static B int_tools_higher_power_of_2(B val)
63 {
64 B i = 0;
65
66 while((val >> i) > 1)
67 i++;
68
69 return i;
70 }
71
73
74}
75
76#endif
are defined here basic integer types that tend to be portable
include macro defined by the configure script and some specific additional ones
libdar namespace encapsulate all libdar symbols
Definition archive.hpp:47