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/*
*
* (C) 2020 - 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.
*
*/
#ifndef _CARDINALITY_H_
#define _CARDINALITY_H_
#include "ntop_includes.h"
/* ******************************* */
class Cardinality {
private:
struct ndpi_hll hll;
public:
Cardinality() {
memset(&hll, 0, sizeof(hll));
}
~Cardinality() {
ndpi_hll_destroy(&hll);
}
void init(u_int8_t bits) {
if(ndpi_hll_init(&hll, bits))
throw "init error";
}
void addElement(const char *value, size_t value_len) {
ndpi_hll_add(&hll, value, value_len);
}
void addElement(u_int32_t value) {
ndpi_hll_add_number(&hll, value);
}
u_int32_t getEstimate() {
return((u_int32_t)ndpi_hll_count(&hll));
}
void reset() {
memset(hll.registers, 0, hll.size); /* A lock might help here... */
}
};
#endif /* _CARDINALITY_H_ */
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