62 lines
2.1 KiB
C
62 lines
2.1 KiB
C
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#ifndef SELECT_h
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#define SELECT_h
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#include "cmph_types.h"
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struct _select_t
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{
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cmph_uint32 n,m;
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cmph_uint32 * bits_vec;
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cmph_uint32 * select_table;
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};
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typedef struct _select_t select_t;
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void select_init(select_t * sel, cmph_uint32 n, cmph_uint32 m);
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void select_destroy(select_t * sel);
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void select_generate(select_t * sel, cmph_uint32 * keys_vec);
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cmph_int32 select_query(select_t * sel, cmph_uint32 one_idx);
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cmph_int32 select_next_query(select_t * sel, cmph_uint32 vec_bit_idx);
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double select_get_space_usage(select_t * sel);
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void select_dump(select_t *sel, char **buf, cmph_uint32 *buflen);
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void select_load(select_t * sel, const char *buf, cmph_uint32 buflen);
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/** \fn void select_pack(select_t *sel, void *sel_packed);
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* \brief Support the ability to pack a select structure function into a preallocated contiguous memory space pointed by sel_packed.
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* \param sel points to the select structure
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* \param sel_packed pointer to the contiguous memory area used to store the select structure. The size of sel_packed must be at least @see select_packed_size
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*/
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void select_pack(select_t *sel, void *sel_packed);
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/** \fn cmph_uint32 select_packed_size(select_t *sel);
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* \brief Return the amount of space needed to pack a select structure.
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* \return the size of the packed select structure or zero for failures
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*/
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cmph_uint32 select_packed_size(select_t *sel);
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/** \fn cmph_int32 select_query_packed(void * sel_packed, cmph_uint32 idx);
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* \param sel_packed is a pointer to a contiguous memory area
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* \param one_idx is the rank for which we want to calculate the inverse function select
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* \return an integer that represents the select value of rank idx.
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*/
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cmph_int32 select_query_packed(void * sel_packed, cmph_uint32 one_idx);
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/** \fn cmph_int32 select_next_query_packed(void * sel_packed, cmph_uint32 vec_bit_idx);
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* \param sel_packed is a pointer to a contiguous memory area
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* \param vec_bit_idx is a value prior computed by @see select_query_packed
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* \return an integer that represents the next select value greater than @see vec_bit_idx.
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*/
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cmph_int32 select_next_query_packed(void * sel_packed, cmph_uint32 vec_bit_idx);
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#endif
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