/src/ntopng/include/Bitmask.h
Line | Count | Source (jump to first uncovered line) |
1 | | /* |
2 | | * |
3 | | * (C) 2013-24 - ntop.org |
4 | | * |
5 | | * |
6 | | * This program is free software; you can redistribute it and/or modify |
7 | | * it under the terms of the GNU General Public License as published by |
8 | | * the Free Software Foundation; either version 3 of the License, or |
9 | | * (at your option) any later version. |
10 | | * |
11 | | * This program is distributed in the hope that it will be useful, |
12 | | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | | * GNU General Public License for more details. |
15 | | * |
16 | | * You should have received a copy of the GNU General Public License |
17 | | * along with this program; if not, write to the Free Software Foundation, |
18 | | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
19 | | * |
20 | | */ |
21 | | |
22 | | /** |
23 | | * @file Bitmask.h |
24 | | * |
25 | | * @brief Bitmask class implementation. |
26 | | * @details A Bitmask instance represents a simple bitmask, where bits can be |
27 | | * set, cleared and read. |
28 | | */ |
29 | | |
30 | | #ifndef _BITMASK_H_ |
31 | | #define _BITMASK_H_ |
32 | | |
33 | | #include "ntop_includes.h" |
34 | | |
35 | | /* |
36 | | NOTE |
37 | | |
38 | | Bitmask is not thread safe and locking is not a bad idea |
39 | | however we believe that (on most architectures) writing a |
40 | | bimask byte while reading it won't be a problem. |
41 | | */ |
42 | | |
43 | | class Bitmask { |
44 | | private: |
45 | | u_int32_t tot_elems; /**< The bitmask size in bits */ |
46 | | u_int32_t num_elems; /**< The bitmask size in bytes */ |
47 | | u_int32_t *bits; /**< The bitmask */ |
48 | | |
49 | | void bitmask_set(u_int32_t n); |
50 | | void bitmask_clr(u_int32_t n); |
51 | | bool bitmask_isset(u_int32_t n); |
52 | | void bitmask_clr_all(); |
53 | | |
54 | | public: |
55 | | Bitmask(u_int32_t num_tot_elems); |
56 | | ~Bitmask(); |
57 | | |
58 | | /** |
59 | | * Sets a bit in the bitmask. |
60 | | * @param bit The bit position. |
61 | | */ |
62 | 48 | inline void set_bit(u_int32_t bit) { bitmask_set(bit); } |
63 | | |
64 | | /** |
65 | | * Clears a bit in the bitmask. |
66 | | * @param bit The bit position. |
67 | | */ |
68 | 1 | inline void clear_bit(u_int32_t bit) { bitmask_clr(bit); } |
69 | | |
70 | | /** |
71 | | * Checks if a bit is set. |
72 | | * @param bit The bit position. |
73 | | * @return True if the bit is set, false otherwise. |
74 | | */ |
75 | 8.61k | inline bool is_set_bit(u_int32_t bit) { |
76 | 8.61k | return (bitmask_isset(bit) ? true : false); |
77 | 8.61k | } |
78 | | |
79 | | /** |
80 | | * Clears all the bits in the bitmask. |
81 | | */ |
82 | 0 | inline void clear_all_bits() { bitmask_clr_all(); } |
83 | | |
84 | | void print(); |
85 | | }; |
86 | | |
87 | | #endif /* _BITMASK_H_ */ |