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