32 lines
1.2 KiB
C
32 lines
1.2 KiB
C
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* A bloom filter.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef __sslbloom_h_
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#define __sslbloom_h_
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#include "prtypes.h"
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#include "seccomon.h"
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typedef struct sslBloomFilterStr {
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unsigned int k; /* The number of hashes. */
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unsigned int bits; /* The number of bits in each hash: bits = log2(m) */
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PRUint8 *filter; /* The filter itself. */
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} sslBloomFilter;
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SECStatus sslBloom_Init(sslBloomFilter *filter, unsigned int k, unsigned int bits);
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void sslBloom_Zero(sslBloomFilter *filter);
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void sslBloom_Fill(sslBloomFilter *filter);
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/* Add the given hashes to the filter. It's the caller's responsibility to
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* ensure that there is at least |ceil(k*bits/8)| bytes of data available in
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* |hashes|. Returns PR_TRUE if the entry was already present or it was likely
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* to be present. */
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PRBool sslBloom_Add(sslBloomFilter *filter, const PRUint8 *hashes);
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PRBool sslBloom_Check(sslBloomFilter *filter, const PRUint8 *hashes);
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void sslBloom_Destroy(sslBloomFilter *filter);
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#endif /* __sslbloom_h_ */
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