49 lines
1.8 KiB
C
49 lines
1.8 KiB
C
#ifndef __CMPH_FCH_H__
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#define __CMPH_FCH_H__
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#include "cmph.h"
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typedef struct __fch_data_t fch_data_t;
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typedef struct __fch_config_data_t fch_config_data_t;
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/* Parameters calculation */
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cmph_uint32 fch_calc_b(double c, cmph_uint32 m);
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double fch_calc_p1(cmph_uint32 m);
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double fch_calc_p2(cmph_uint32 b);
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cmph_uint32 mixh10h11h12(cmph_uint32 b, double p1, double p2, cmph_uint32 initial_index);
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fch_config_data_t *fch_config_new();
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void fch_config_set_hashfuncs(cmph_config_t *mph, CMPH_HASH *hashfuncs);
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void fch_config_destroy(cmph_config_t *mph);
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cmph_t *fch_new(cmph_config_t *mph, double c);
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void fch_load(FILE *f, cmph_t *mphf);
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int fch_dump(cmph_t *mphf, FILE *f);
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void fch_destroy(cmph_t *mphf);
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cmph_uint32 fch_search(cmph_t *mphf, const char *key, cmph_uint32 keylen);
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/** \fn void fch_pack(cmph_t *mphf, void *packed_mphf);
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* \brief Support the ability to pack a perfect hash function into a preallocated contiguous memory space pointed by packed_mphf.
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* \param mphf pointer to the resulting mphf
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* \param packed_mphf pointer to the contiguous memory area used to store the resulting mphf. The size of packed_mphf must be at least cmph_packed_size()
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*/
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void fch_pack(cmph_t *mphf, void *packed_mphf);
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/** \fn cmph_uint32 fch_packed_size(cmph_t *mphf);
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* \brief Return the amount of space needed to pack mphf.
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* \param mphf pointer to a mphf
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* \return the size of the packed function or zero for failures
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*/
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cmph_uint32 fch_packed_size(cmph_t *mphf);
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/** cmph_uint32 fch_search(void *packed_mphf, const char *key, cmph_uint32 keylen);
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* \brief Use the packed mphf to do a search.
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* \param packed_mphf pointer to the packed mphf
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* \param key key to be hashed
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* \param keylen key legth in bytes
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* \return The mphf value
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*/
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cmph_uint32 fch_search_packed(void *packed_mphf, const char *key, cmph_uint32 keylen);
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#endif
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