mirror of
https://github.com/ntop/ntopng.git
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87 lines
2.2 KiB
C++
87 lines
2.2 KiB
C++
/*
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*
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* (C) 2013-25 - ntop.org
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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/**
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* @file Bitmask.h
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*
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* @brief Bitmask class implementation.
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* @details A Bitmask instance represents a simple bitmask, where bits can be
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* set, cleared and read.
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*/
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#ifndef _BITMASK_H_
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#define _BITMASK_H_
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#include "ntop_includes.h"
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/*
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NOTE
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Bitmask is not thread safe and locking is not a bad idea
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however we believe that (on most architectures) writing a
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bimask byte while reading it won't be a problem.
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*/
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class Bitmask {
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private:
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u_int32_t tot_elems; /**< The bitmask size in bits */
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u_int32_t num_elems; /**< The bitmask size in bytes */
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u_int32_t *bits; /**< The bitmask */
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void bitmask_set(u_int32_t n);
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void bitmask_clr(u_int32_t n);
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bool bitmask_isset(u_int32_t n);
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void bitmask_clr_all();
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public:
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Bitmask(u_int32_t num_tot_elems);
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~Bitmask();
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/**
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* Sets a bit in the bitmask.
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* @param bit The bit position.
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*/
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inline void set_bit(u_int32_t bit) { bitmask_set(bit); }
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/**
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* Clears a bit in the bitmask.
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* @param bit The bit position.
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*/
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inline void clear_bit(u_int32_t bit) { bitmask_clr(bit); }
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/**
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* Checks if a bit is set.
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* @param bit The bit position.
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* @return True if the bit is set, false otherwise.
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*/
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inline bool is_set_bit(u_int32_t bit) {
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return (bitmask_isset(bit) ? true : false);
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}
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/**
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* Clears all the bits in the bitmask.
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*/
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inline void clear_all_bits() { bitmask_clr_all(); }
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void print();
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};
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#endif /* _BITMASK_H_ */
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