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74 lines
2.5 KiB
C++
74 lines
2.5 KiB
C++
/*******************************************************************************
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* util/bdbloom.h *
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* *
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* BitDHT: An Flexible DHT library. *
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* *
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* Copyright 2011 by Robert Fernie <bitdht@lunamutt.com> *
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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 Affero General Public License as *
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* published by the Free Software Foundation, either version 3 of the *
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* License, or (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 Affero General Public License for more details. *
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* *
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* You should have received a copy of the GNU Affero General Public License *
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* along with this program. If not, see <https://www.gnu.org/licenses/>. *
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* *
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*******************************************************************************/
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#ifndef BITDHT_BLOOM_H
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#define BITDHT_BLOOM_H
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#include <vector>
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#include <string>
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#include <iostream>
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#include <inttypes.h>
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class bloomFilter
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{
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public:
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bloomFilter(int m, int k);
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int setFilterBits(const std::string &hex);
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std::string getFilter();
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void printFilter(std::ostream &out);
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bool test(const std::string &hex); // takes first m bits.
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void add(const std::string &hex);
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uint32_t countBits();
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uint32_t filterBits();
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protected:
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void setHashFunction(int idx, uint32_t (*hashfn)(const std::string &));
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private:
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void setBit(int bit);
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bool isBitSet(int bit);
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std::vector<uint8_t> mBits;
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std::vector<uint32_t (*)(const std::string &)> mHashFns;
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uint32_t mFilterBits;
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uint32_t mNoHashs;
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uint32_t mNoElements;
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};
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/* our specific implementation */
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class bdBloom: public bloomFilter
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{
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public:
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bdBloom();
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};
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#endif
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