44 lines
1.4 KiB
C
44 lines
1.4 KiB
C
#pragma once
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/***
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This file is part of systemd.
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Copyright 2013 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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/*
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* Our default bloom filter has the following parameters:
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*
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* m=512 (bits in the filter)
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* k=8 (hash functions)
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*
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* We use SipHash24 as hash function with a number of (originally
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* randomized) but fixed hash keys.
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*
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*/
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#define DEFAULT_BLOOM_SIZE (512/8) /* m: filter size */
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#define DEFAULT_BLOOM_N_HASH 8 /* k: number of hash functions */
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void bloom_add_pair(uint64_t filter[], size_t size, unsigned n_hash, const char *a, const char *b);
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void bloom_add_prefixes(uint64_t filter[], size_t size, unsigned n_hash, const char *a, const char *b, char sep);
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bool bloom_validate_parameters(size_t size, unsigned n_hash);
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