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77 lines
3.3 KiB
C
77 lines
3.3 KiB
C
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#ifndef __CMPH_HASH_H__
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#define __CMPH_HASH_H__
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#include "cmph_types.h"
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typedef union __hash_state_t hash_state_t;
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hash_state_t *hash_state_new(CMPH_HASH, cmph_uint32 hashsize);
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/** \fn cmph_uint32 hash(hash_state_t *state, const char *key, cmph_uint32 keylen);
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* \param state is a pointer to a hash_state_t structure
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* \param key is a pointer to a key
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* \param keylen is the key length
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* \return an integer that represents a hash value of 32 bits.
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*/
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cmph_uint32 hash(hash_state_t *state, const char *key, cmph_uint32 keylen);
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/** \fn void hash_vector(hash_state_t *state, const char *key, cmph_uint32 keylen, cmph_uint32 * hashes);
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* \param state is a pointer to a hash_state_t structure
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* \param key is a pointer to a key
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* \param keylen is the key length
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* \param hashes is a pointer to a memory large enough to fit three 32-bit integers.
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*/
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void hash_vector(hash_state_t *state, const char *key, cmph_uint32 keylen, cmph_uint32 * hashes);
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void hash_state_dump(hash_state_t *state, char **buf, cmph_uint32 *buflen);
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hash_state_t * hash_state_copy(hash_state_t *src_state);
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hash_state_t *hash_state_load(const char *buf, cmph_uint32 buflen);
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void hash_state_destroy(hash_state_t *state);
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/** \fn void hash_state_pack(hash_state_t *state, void *hash_packed);
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* \brief Support the ability to pack a hash function into a preallocated contiguous memory space pointed by hash_packed.
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* \param state points to the hash function
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* \param hash_packed pointer to the contiguous memory area used to store the hash function. The size of hash_packed must be at least hash_state_packed_size()
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*
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* Support the ability to pack a hash function into a preallocated contiguous memory space pointed by hash_packed.
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* However, the hash function type must be packed outside.
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*/
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void hash_state_pack(hash_state_t *state, void *hash_packed);
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/** \fn cmph_uint32 hash_packed(void *hash_packed, CMPH_HASH hashfunc, const char *k, cmph_uint32 keylen);
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* \param hash_packed is a pointer to a contiguous memory area
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* \param hashfunc is the type of the hash function packed in hash_packed
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* \param key is a pointer to a key
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* \param keylen is the key length
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* \return an integer that represents a hash value of 32 bits.
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*/
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cmph_uint32 hash_packed(void *hash_packed, CMPH_HASH hashfunc, const char *k, cmph_uint32 keylen);
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/** \fn cmph_uint32 hash_state_packed_size(CMPH_HASH hashfunc)
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* \brief Return the amount of space needed to pack a hash function.
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* \param hashfunc function type
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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 hash_state_packed_size(CMPH_HASH hashfunc);
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/** \fn hash_vector_packed(void *hash_packed, CMPH_HASH hashfunc, const char *k, cmph_uint32 keylen, cmph_uint32 * hashes);
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* \param hash_packed is a pointer to a contiguous memory area
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* \param key is a pointer to a key
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* \param keylen is the key length
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* \param hashes is a pointer to a memory large enough to fit three 32-bit integers.
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*/
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void hash_vector_packed(void *hash_packed, CMPH_HASH hashfunc, const char *k, cmph_uint32 keylen, cmph_uint32 * hashes);
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/** \fn CMPH_HASH hash_get_type(hash_state_t *state);
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* \param state is a pointer to a hash_state_t structure
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* \return the hash function type pointed by state
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*/
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CMPH_HASH hash_get_type(hash_state_t *state);
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#endif
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