mirror of
https://gitlab.gnome.org/GNOME/glib.git
synced 2024-12-26 15:36:14 +01:00
56 lines
2.2 KiB
C
56 lines
2.2 KiB
C
#ifndef __CMPH_COMPRESSED_RANK_H__
|
|
#define __CMPH_COMPRESSED_RANK_H__
|
|
|
|
#include "select.h"
|
|
|
|
struct _compressed_rank_t
|
|
{
|
|
cmph_uint32 max_val;
|
|
cmph_uint32 n; // number of values stored in vals_rems
|
|
// The length in bits of each value is decomposed into two compnents: the lg(n) MSBs are stored in rank_select data structure
|
|
// the remaining LSBs are stored in a table of n cells, each one of rem_r bits.
|
|
cmph_uint32 rem_r;
|
|
select_t sel;
|
|
cmph_uint32 * vals_rems;
|
|
};
|
|
|
|
typedef struct _compressed_rank_t compressed_rank_t;
|
|
|
|
void compressed_rank_init(compressed_rank_t * cr);
|
|
|
|
void compressed_rank_destroy(compressed_rank_t * cr);
|
|
|
|
void compressed_rank_generate(compressed_rank_t * cr, cmph_uint32 * vals_table, cmph_uint32 n);
|
|
|
|
cmph_uint32 compressed_rank_query(compressed_rank_t * cr, cmph_uint32 idx);
|
|
|
|
cmph_uint32 compressed_rank_get_space_usage(compressed_rank_t * cr);
|
|
|
|
void compressed_rank_dump(compressed_rank_t * cr, char **buf, cmph_uint32 *buflen);
|
|
|
|
void compressed_rank_load(compressed_rank_t * cr, const char *buf, cmph_uint32 buflen);
|
|
|
|
|
|
/** \fn void compressed_rank_pack(compressed_rank_t *cr, void *cr_packed);
|
|
* \brief Support the ability to pack a compressed_rank structure into a preallocated contiguous memory space pointed by cr_packed.
|
|
* \param cr points to the compressed_rank structure
|
|
* \param cr_packed pointer to the contiguous memory area used to store the compressed_rank structure. The size of cr_packed must be at least @see compressed_rank_packed_size
|
|
*/
|
|
void compressed_rank_pack(compressed_rank_t *cr, void *cr_packed);
|
|
|
|
/** \fn cmph_uint32 compressed_rank_packed_size(compressed_rank_t *cr);
|
|
* \brief Return the amount of space needed to pack a compressed_rank structure.
|
|
* \return the size of the packed compressed_rank structure or zero for failures
|
|
*/
|
|
cmph_uint32 compressed_rank_packed_size(compressed_rank_t *cr);
|
|
|
|
|
|
/** \fn cmph_uint32 compressed_rank_query_packed(void * cr_packed, cmph_uint32 idx);
|
|
* \param cr_packed is a pointer to a contiguous memory area
|
|
* \param idx is an index to compute the rank
|
|
* \return an integer that represents the compressed_rank value.
|
|
*/
|
|
cmph_uint32 compressed_rank_query_packed(void * cr_packed, cmph_uint32 idx);
|
|
|
|
#endif
|