1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
/*
*
* (C) 2013-22 - ntop.org
*
*
* 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 3 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
/**
* @file Bitmask.h
*
* @brief Bitmask class implementation.
* @details A Bitmask instance represents a simple bitmask, where bits can be set, cleared and read.
*/
#ifndef _BITMASK_H_
#define _BITMASK_H_
#include "ntop_includes.h"
/*
NOTE
Bitmask is not thread safe and locking is not a bad idea
however we believe that (on most architectures) writing a
bimask byte while reading it won't be a problem.
*/
class Bitmask {
private:
u_int32_t tot_elems; /**< The bitmask size in bits */
u_int32_t num_elems; /**< The bitmask size in bytes */
u_int32_t *bits; /**< The bitmask */
void bitmask_set(u_int32_t n);
void bitmask_clr(u_int32_t n);
bool bitmask_isset(u_int32_t n);
public:
Bitmask(u_int32_t num_tot_elems);
~Bitmask();
/**
* Sets a bit in the bitmask.
* @param bit The bit position.
*/
inline void set_bit(u_int32_t bit) { bitmask_set(bit); }
/**
* Clears a bit in the bitmask.
* @param bit The bit position.
*/
inline void clear_bit(u_int32_t bit) { bitmask_clr(bit); }
/**
* Checks if a bit is set.
* @param bit The bit position.
* @return True if the bit is set, false otherwise.
*/
inline bool is_set_bit(u_int32_t bit) { return(bitmask_isset(bit) ? true : false); }
void print();
};
#endif /* _BITMASK_H_ */
|
