mirror of
https://github.com/ntop/ntopng.git
synced 2026-05-20 17:29:13 +00:00
128 lines
3.4 KiB
C++
128 lines
3.4 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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#include "ntop_includes.h"
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/* ********************************************************** */
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/**
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* Constructor: initialized the bitmask
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* @param num_tot_elems The bitmask size in number of bit.
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*/
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Bitmask::Bitmask(u_int32_t num_tot_elems) {
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if(trace_new_delete) ntop->getTrace()->traceEvent(TRACE_NORMAL, "[new] %s", __FILE__);
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tot_elems = num_tot_elems;
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num_elems = tot_elems / 8;
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if (num_elems == 0 || tot_elems != num_elems * 8) {
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ntop->getTrace()->traceEvent(TRACE_ERROR,
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"Unexpected bitmask length. Leaving...");
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exit(-1);
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}
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bits = (u_int32_t *)malloc(num_elems);
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if (!bits) {
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ntop->getTrace()->traceEvent(TRACE_ERROR, "Not enough memory. Leaving...");
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exit(-1);
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}
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memset(bits, 0, num_elems);
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}
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/* ********************************************************** */
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/**
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* Destructor.
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*/
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Bitmask::~Bitmask() {
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if(trace_new_delete) ntop->getTrace()->traceEvent(TRACE_NORMAL, "[delete] %s", __FILE__);
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if (bits) free(bits);
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}
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/* ********************************************************** */
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/**
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* Prints the content of the bitmask.
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*/
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void Bitmask::print() {
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u_int32_t len = 8 * sizeof(bits);
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ntop->getTrace()->traceEvent(TRACE_INFO, "Matches: ");
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for (u_int32_t i = 0; i < len; i++)
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if (is_set_bit(i)) ntop->getTrace()->traceEvent(TRACE_INFO, "[%d]", i);
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printf("\n");
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}
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/* ********************************************************** */
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void Bitmask::bitmask_set(u_int32_t n) {
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u_int32_t idx = (n >> 5);
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if (idx >= num_elems) {
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ntop->getTrace()->traceEvent(
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TRACE_WARNING,
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"INTERNAL ERROR: Bitmask::bitmask_set(%u) out of range (%u >= %u)", n,
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idx, num_elems);
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return;
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}
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bits[idx] |= (1 << (n & 0x1F));
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}
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/* ********************************************************** */
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void Bitmask::bitmask_clr(u_int32_t n) {
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u_int32_t idx = (n >> 5);
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if (idx >= num_elems) {
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ntop->getTrace()->traceEvent(
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TRACE_WARNING,
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"INTERNAL ERROR: Bitmask::bitmask_clr(%u) out of range (%u >= %u)", n,
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idx, num_elems);
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return;
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}
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bits[idx] &= ~(1 << (n & 0x1F));
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}
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/* ********************************************************** */
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bool Bitmask::bitmask_isset(u_int32_t n) {
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u_int32_t idx = (n >> 5);
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if (idx >= num_elems) {
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ntop->getTrace()->traceEvent(
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TRACE_WARNING,
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"INTERNAL ERROR: Bitmask::bitmask_isset(%u) out of range (%u >= %u)", n,
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idx, num_elems);
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return (false);
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}
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return (((bits[idx] & (1 << (n & 0x1F)))) ? true : false);
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}
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/* ********************************************************** */
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void Bitmask::bitmask_clr_all() { memset(bits, 0, num_elems); }
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