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Diffstat (limited to 'girepository/cmph/select.h')
-rw-r--r-- | girepository/cmph/select.h | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/girepository/cmph/select.h b/girepository/cmph/select.h new file mode 100644 index 00000000..a31eb0f2 --- /dev/null +++ b/girepository/cmph/select.h @@ -0,0 +1,61 @@ +#ifndef __CMPH_SELECT_H__ +#define __CMPH_SELECT_H__ + +#include "cmph_types.h" + +struct _select_t +{ + cmph_uint32 n,m; + cmph_uint32 * bits_vec; + cmph_uint32 * select_table; +}; + +typedef struct _select_t select_t; + +void select_init(select_t * sel); + +void select_destroy(select_t * sel); + +void select_generate(select_t * sel, cmph_uint32 * keys_vec, cmph_uint32 n, cmph_uint32 m); + +cmph_uint32 select_query(select_t * sel, cmph_uint32 one_idx); + +cmph_uint32 select_next_query(select_t * sel, cmph_uint32 vec_bit_idx); + +cmph_uint32 select_get_space_usage(select_t * sel); + +void select_dump(select_t *sel, char **buf, cmph_uint32 *buflen); + +void select_load(select_t * sel, const char *buf, cmph_uint32 buflen); + + +/** \fn void select_pack(select_t *sel, void *sel_packed); + * \brief Support the ability to pack a select structure into a preallocated contiguous memory space pointed by sel_packed. + * \param sel points to the select structure + * \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 + */ +void select_pack(select_t *sel, void *sel_packed); + +/** \fn cmph_uint32 select_packed_size(select_t *sel); + * \brief Return the amount of space needed to pack a select structure. + * \return the size of the packed select structure or zero for failures + */ +cmph_uint32 select_packed_size(select_t *sel); + + +/** \fn cmph_uint32 select_query_packed(void * sel_packed, cmph_uint32 one_idx); + * \param sel_packed is a pointer to a contiguous memory area + * \param one_idx is the rank for which we want to calculate the inverse function select + * \return an integer that represents the select value of rank idx. + */ +cmph_uint32 select_query_packed(void * sel_packed, cmph_uint32 one_idx); + + +/** \fn cmph_uint32 select_next_query_packed(void * sel_packed, cmph_uint32 vec_bit_idx); + * \param sel_packed is a pointer to a contiguous memory area + * \param vec_bit_idx is a value prior computed by @see select_query_packed + * \return an integer that represents the next select value greater than @see vec_bit_idx. + */ +cmph_uint32 select_next_query_packed(void * sel_packed, cmph_uint32 vec_bit_idx); + +#endif |