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bloom.c
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bloom.c
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#include <limits.h>
#include <stdarg.h>
#include "bloom.h"
#define SETBIT(a,n) (a[n/CHAR_BIT] |= (1<<(n%CHAR_BIT)))
#define GETBIT(a,n) (a[n/CHAR_BIT] & (1<<(n%CHAR_BIT)))
BLOOM* bloom_create(size_t size,size_t nfuncs,...)
{
BLOOM* bloom;
va_list l;
int n;
if (!(bloom = malloc(sizeof(BLOOM)))) return NULL;
if (!(bloom->a = calloc((size+CHAR_BIT-1)/CHAR_BIT,sizeof(char))))
{
free(bloom);
return NULL;
}
if (!(bloom->funcs = (hashfunc_t*)malloc(nfuncs*sizeof(hashfunc_t))))
{
free(bloom->a);
free(bloom);
return NULL;
}
va_start(l,nfuncs);
for (n = 0; n < nfuncs; ++n)
{
bloom->funcs[n] = va_arg(l,hashfunc_t);
}
va_end(l);
bloom->nfuncs = nfuncs;
bloom->asize = size;
return bloom;
}
int bloom_destroy(BLOOM* bloom)
{
free(bloom->a);
free(bloom->funcs);
free(bloom);
return 0;
}
int bloom_add(BLOOM* bloom,const char* s)
{
size_t n;
for (n = 0; n < bloom->nfuncs; ++n)
{
SETBIT(bloom->a,bloom->funcs[n](s)%bloom->asize);
}
return 0;
}
int bloom_check(BLOOM* bloom,const char* s)
{
size_t n;
for (n = 0; n < bloom->nfuncs; ++n)
{
if (!(GETBIT(bloom->a,bloom->funcs[n](s)%bloom->asize))) return 0;
}
return 1;
}