sslbloom.h - mozsearch

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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/*

 * A bloom filter.

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef __sslbloom_h_

#define __sslbloom_h_

#include "prtypes.h"

#include "seccomon.h"

typedef struct sslBloomFilterStr {

    unsigned int k;    /* The number of hashes. */

    unsigned int bits; /* The number of bits in each hash: bits = log2(m) */

    PRUint8 *filter;   /* The filter itself. */

} sslBloomFilter;

SECStatus sslBloom_Init(sslBloomFilter *filter, unsigned int k, unsigned int bits);

void sslBloom_Zero(sslBloomFilter *filter);

void sslBloom_Fill(sslBloomFilter *filter);

/* Add the given hashes to the filter.  It's the caller's responsibility to

 * ensure that there is at least |ceil(k*bits/8)| bytes of data available in

 * |hashes|. Returns PR_TRUE if the entry was already present or it was likely

 * to be present. */

PRBool sslBloom_Add(sslBloomFilter *filter, const PRUint8 *hashes);

PRBool sslBloom_Check(sslBloomFilter *filter, const PRUint8 *hashes);

void sslBloom_Destroy(sslBloomFilter *filter);

#endif /* __sslbloom_h_ */