FCH algorithm added but not tested...
This commit is contained in:
fc_botelho
parent
6b9ee06643
commit
ee06e15f43
@ -19,7 +19,9 @@ libcmph_la_SOURCES = debug.h\
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bmz8.h bmz8_structs.h bmz8.c\
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buffer_manager.h buffer_manager.c\
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buffer_entry.h buffer_entry.c\
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brz.h brz_structs.h brz.c
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brz.h brz_structs.h brz.c\
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fch.h fch_structs.h fch.c\
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fch_buckets.h fch_buckets.c
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libcmph_la_LDFLAGS = -version-info 0:0:0
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@ -468,6 +468,7 @@ int bmz_dump(cmph_t *mphf, FILE *fd)
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fwrite(data->g, sizeof(cmph_uint32)*(data->n), 1, fd);
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#ifdef DEBUG
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cmph_uint32 i;
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fprintf(stderr, "G: ");
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for (i = 0; i < data->n; ++i) fprintf(stderr, "%u ", data->g[i]);
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fprintf(stderr, "\n");
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395
src/fch.c
Normal file
395
src/fch.c
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@ -0,0 +1,395 @@
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#include "fch.h"
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#include "cmph_structs.h"
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#include "fch_structs.h"
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#include "hash.h"
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#include "bitbool.h"
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#include "fch_buckets.h"
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//#include <sys/time.h>
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#include <time.h>
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#include <math.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <assert.h>
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#include <string.h>
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#define INDEX 0 /* alignment index within a bucket */
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//#define DEBUG
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#include "debug.h"
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static cmph_uint32 mixh10h11h12(cmph_uint32 b, cmph_float32 p1, cmph_float32 p2, cmph_uint32 initial_index);
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static void calc_parameters(fch_config_data_t *fch);
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static fch_buckets_t * mapping(cmph_config_t *mph);
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static cmph_uint32 * ordering(fch_buckets_t * buckets);
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static cmph_uint8 check_for_collisions_h2(fch_config_data_t *fch, fch_buckets_t * buckets);
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static void permut(cmph_uint32 * vector, cmph_uint32 n);
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static cmph_uint8 searching(fch_config_data_t *fch, fch_buckets_t *buckets, cmph_uint32 *sorted_indexes);
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fch_config_data_t *fch_config_new()
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{
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fch_config_data_t *fch;
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fch = (fch_config_data_t *)malloc(sizeof(fch_config_data_t));
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assert(fch);
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memset(fch, 0, sizeof(fch_config_data_t));
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fch->hashfuncs[0] = CMPH_HASH_JENKINS;
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fch->hashfuncs[1] = CMPH_HASH_JENKINS;
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fch->m = fch->b = 0;
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fch->c = fch->p1 = fch->p2 = 0;
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fch->g = NULL;
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fch->h1 = NULL;
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fch->h2 = NULL;
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return fch;
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}
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void fch_config_destroy(cmph_config_t *mph)
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{
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fch_config_data_t *data = (fch_config_data_t *)mph->data;
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//DEBUGP("Destroying algorithm dependent data\n");
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free(data);
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}
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void fch_config_set_hashfuncs(cmph_config_t *mph, CMPH_HASH *hashfuncs)
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{
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fch_config_data_t *fch = (fch_config_data_t *)mph->data;
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CMPH_HASH *hashptr = hashfuncs;
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cmph_uint32 i = 0;
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while(*hashptr != CMPH_HASH_COUNT)
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{
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if (i >= 2) break; //fch only uses two hash functions
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fch->hashfuncs[i] = *hashptr;
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++i, ++hashptr;
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}
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}
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static cmph_uint32 mixh10h11h12(cmph_uint32 b, cmph_float32 p1, cmph_float32 p2, cmph_uint32 initial_index)
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{
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if (initial_index < p1) initial_index %= (cmph_uint32)p2; /* h11 o h10 */
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else { /* h12 o h10 */
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initial_index %= b;
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if(initial_index < p2) initial_index += (cmph_uint32)p2;
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}
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return initial_index;
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}
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static void calc_parameters(fch_config_data_t *fch)
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{
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fch->b = (cmph_uint32)ceil((fch->c*fch->m)/(log(fch->m)/log(2) + 1));
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fch->p1 = ceil(0.6*fch->m);
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fch->p2 = ceil(0.3*fch->b);
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}
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static fch_buckets_t * mapping(cmph_config_t *mph)
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{
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// struct timeval seed;
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cmph_uint32 i = 0;
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fch_buckets_t *buckets = NULL;
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fch_config_data_t *fch = (fch_config_data_t *)mph->data;
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// gettimeofday(&seed,NULL);
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// srand((cmph_uint32)((seed.tv_sec + 1001*seed.tv_usec)));
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srand((cmph_uint32)time(NULL));
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if (fch->h1) hash_state_destroy(fch->h1);
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fch->h1 = hash_state_new(fch->hashfuncs[0], fch->m);
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calc_parameters (fch);
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buckets = fch_buckets_new(fch->b);
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mph->key_source->rewind(mph->key_source->data);
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for(i = 0; i < fch->m; i++)
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{
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cmph_uint32 h1, keylen;
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char *key = NULL;
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mph->key_source->read(mph->key_source->data, &key, &keylen);
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h1 = hash(fch->h1, key, keylen) % fch->m;
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h1 = mixh10h11h12 (fch->b, fch->p1, fch->p2, h1);
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fch_buckets_insert(buckets, h1, key, keylen);
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key = NULL; // transger memory ownership
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}
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return buckets;
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}
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// returns the buckets indexes sorted by their sizes.
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static cmph_uint32 * ordering(fch_buckets_t * buckets)
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{
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return fch_buckets_get_indexes_sorted_by_size(buckets);
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}
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/* Check whether function h2 causes collisions among the keys of each bucket */
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static cmph_uint8 check_for_collisions_h2(fch_config_data_t *fch, fch_buckets_t * buckets)
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{
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//cmph_uint32 max_size = fch_buckets_get_max_size(buckets);
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cmph_uint8 * hashtable = (cmph_uint8 *)calloc(fch->m, sizeof(cmph_uint8));
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cmph_uint32 nbuckets = fch_buckets_get_nbuckets(buckets);
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cmph_uint32 i = 0, index = 0, j =0;
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for (i = 0; i < nbuckets; i++)
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{
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cmph_uint32 nkeys = fch_buckets_get_size(buckets, i);
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memset(hashtable, 0, fch->m);
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for (j = 0; j < nkeys; j++)
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{
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char * key = fch_buckets_get_key(buckets, i, j);
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cmph_uint32 keylen = fch_buckets_get_keylength(buckets, i, j);
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index = hash(fch->h2, key, keylen) % fch->m;
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if(hashtable[index]) { // collision detected
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free(hashtable);
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return 1;
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}
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hashtable[index] = 1;
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}
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}
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free(hashtable);
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return 0;
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}
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static void permut(cmph_uint32 * vector, cmph_uint32 n)
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{
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cmph_uint32 i, j, b;
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srand((cmph_uint32)time(NULL));
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for (i = 0; i < n; i++) {
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j = rand() % n;
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b = vector[i];
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vector[i] = vector[j];
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vector[j] = b;
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}
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}
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static cmph_uint8 searching(fch_config_data_t *fch, fch_buckets_t *buckets, cmph_uint32 *sorted_indexes)
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{
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cmph_uint32 * random_table = (cmph_uint32 *) calloc(fch->m, sizeof(cmph_uint32));
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cmph_uint32 * map_table = (cmph_uint32 *) calloc(fch->m, sizeof(cmph_uint32));
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cmph_uint32 iteration_to_generate_h2 = 0;
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cmph_uint32 searching_iterations = 0;
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cmph_uint8 restart = 0;
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cmph_uint32 nbuckets = fch_buckets_get_nbuckets(buckets);
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cmph_uint32 i, j, z, counter = 0, filled_count = 0;
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if (fch->g) free (fch->g);
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fch->g = (cmph_uint32 *) calloc(fch->b, sizeof(cmph_uint32));
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for(i = 0; i < fch->m; i++)
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{
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random_table[i] = i;
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}
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permut(random_table, fch->m);
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for(i = 0; i < fch->m; i++)
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{
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map_table[random_table[i]] = i;
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}
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//DEBUGP("max bucket size: %u\n", fch_buckets_get_max_size(buckets));
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do {
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srand((cmph_uint32)time(NULL));
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if (fch->h2) hash_state_destroy(fch->h2);
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fch->h2 = hash_state_new(fch->hashfuncs[1], fch->m);
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restart = check_for_collisions_h2(fch, buckets);
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filled_count = 0;
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if (!restart) searching_iterations++;
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else iteration_to_generate_h2++;
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for(i = 0; (i < nbuckets) && !restart; i++) {
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restart = 1; // true
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for(z = 0; (z < (fch->m - filled_count)) && restart; z++) {
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char * key = fch_buckets_get_key(buckets, sorted_indexes[i], INDEX);
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cmph_uint32 keylen = fch_buckets_get_keylength(buckets, sorted_indexes[i], INDEX);
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cmph_uint32 h2 = hash(fch->h2, key, keylen) % fch->m;
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cmph_uint32 bucketsize = fch_buckets_get_size(buckets, sorted_indexes[i]);
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counter = 0;
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restart = 0; // false
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fch->g[sorted_indexes[i]] = (fch->m + random_table[filled_count + z] - h2) % fch->m;
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j = INDEX;
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do {
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cmph_uint32 index = 0;
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key = fch_buckets_get_key(buckets, sorted_indexes[i], j);
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keylen = fch_buckets_get_keylength(buckets, sorted_indexes[i], j);
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h2 = hash(fch->h2, key, keylen) % fch->m;
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index = (h2 + fch->g[sorted_indexes[i]]) % fch->m;
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if (map_table[index] >= filled_count) {
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cmph_uint32 y = map_table[index];
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cmph_uint32 ry = random_table[y];
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random_table[y] = random_table[filled_count];
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random_table[filled_count] = ry;
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map_table[random_table[y]] = y;
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map_table[random_table[filled_count]] = filled_count;
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filled_count++;
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counter ++;
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}
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else {
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restart = 1; // true
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filled_count = filled_count - counter;
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counter = 0;
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break;
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}
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j = (j + 1) % bucketsize;
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} while(j % bucketsize != INDEX);
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}
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}
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} while(restart && (searching_iterations < 100000));
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free(map_table);
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free(random_table);
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return restart;
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}
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cmph_t *fch_new(cmph_config_t *mph, float c)
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{
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cmph_t *mphf = NULL;
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fch_data_t *fchf = NULL;
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cmph_uint32 iterations = 100;
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cmph_uint8 restart_mapping = 0;
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fch_buckets_t * buckets = NULL;
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cmph_uint32 * sorted_indexes = NULL;
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fch_config_data_t *fch = (fch_config_data_t *)mph->data;
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fch->m = mph->key_source->nkeys;
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//DEBUGP("m: %f\n", fch->m);
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fch->c = c;
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//DEBUGP("c: %f\n", fch->c);
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fch->h1 = NULL;
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fch->h2 = NULL;
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fch->g = NULL;
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do
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{
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if (mph->verbosity)
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{
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fprintf(stderr, "Entering mapping step for mph creation of %u keys\n", fch->m);
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}
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if (buckets) fch_buckets_destroy(buckets);
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buckets = mapping(mph);
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if (mph->verbosity)
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{
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fprintf(stderr, "Starting ordering step\n");
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}
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if (sorted_indexes) free (sorted_indexes);
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sorted_indexes = ordering(buckets);
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if (mph->verbosity)
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{
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fprintf(stderr, "Starting searching step.\n");
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}
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restart_mapping = searching(fch, buckets, sorted_indexes);
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} while(restart_mapping && iterations > 0);
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if (buckets) fch_buckets_destroy(buckets);
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if (sorted_indexes) free (sorted_indexes);
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if (iterations == 0) return NULL;
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mphf = (cmph_t *)malloc(sizeof(cmph_t));
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mphf->algo = mph->algo;
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fchf = (fch_data_t *)malloc(sizeof(fch_data_t));
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fchf->g = fch->g;
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fch->g = NULL; //transfer memory ownership
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fchf->h1 = fch->h1;
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fch->h1 = NULL; //transfer memory ownership
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fchf->h2 = fch->h2;
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fch->h2 = NULL; //transfer memory ownership
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fchf->p2 = fch->p2;
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fchf->p1 = fch->p1;
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fchf->b = fch->b;
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fchf->c = fch->c;
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fchf->m = fch->m;
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mphf->data = fchf;
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mphf->size = fch->m;
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//DEBUGP("Successfully generated minimal perfect hash\n");
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if (mph->verbosity)
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{
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fprintf(stderr, "Successfully generated minimal perfect hash function\n");
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}
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return mphf;
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}
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int fch_dump(cmph_t *mphf, FILE *fd)
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{
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char *buf = NULL;
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cmph_uint32 buflen;
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fch_data_t *data = (fch_data_t *)mphf->data;
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__cmph_dump(mphf, fd);
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hash_state_dump(data->h1, &buf, &buflen);
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//DEBUGP("Dumping hash state with %u bytes to disk\n", buflen);
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fwrite(&buflen, sizeof(cmph_uint32), 1, fd);
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fwrite(buf, buflen, 1, fd);
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free(buf);
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hash_state_dump(data->h2, &buf, &buflen);
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//DEBUGP("Dumping hash state with %u bytes to disk\n", buflen);
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fwrite(&buflen, sizeof(cmph_uint32), 1, fd);
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fwrite(buf, buflen, 1, fd);
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free(buf);
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fwrite(&(data->m), sizeof(cmph_uint32), 1, fd);
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fwrite(&(data->c), sizeof(cmph_float32), 1, fd);
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fwrite(&(data->b), sizeof(cmph_uint32), 1, fd);
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fwrite(&(data->p1), sizeof(cmph_float32), 1, fd);
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fwrite(&(data->p2), sizeof(cmph_float32), 1, fd);
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fwrite(data->g, sizeof(cmph_uint32)*(data->b), 1, fd);
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#ifdef DEBUG
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cmph_uint32 i;
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fprintf(stderr, "G: ");
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for (i = 0; i < data->b; ++i) fprintf(stderr, "%u ", data->g[i]);
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fprintf(stderr, "\n");
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#endif
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return 1;
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}
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void fch_load(FILE *f, cmph_t *mphf)
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{
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char *buf = NULL;
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cmph_uint32 buflen;
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fch_data_t *fch = (fch_data_t *)malloc(sizeof(fch_data_t));
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//DEBUGP("Loading fch mphf\n");
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mphf->data = fch;
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//DEBUGP("Reading h1\n");
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fch->h1 = NULL;
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fread(&buflen, sizeof(cmph_uint32), 1, f);
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//DEBUGP("Hash state of h1 has %u bytes\n", buflen);
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buf = (char *)malloc(buflen);
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fread(buf, buflen, 1, f);
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fch->h1 = hash_state_load(buf, buflen);
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free(buf);
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//DEBUGP("Loading fch mphf\n");
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mphf->data = fch;
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//DEBUGP("Reading h2\n");
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fch->h2 = NULL;
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fread(&buflen, sizeof(cmph_uint32), 1, f);
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//DEBUGP("Hash state of h2 has %u bytes\n", buflen);
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buf = (char *)malloc(buflen);
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fread(buf, buflen, 1, f);
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fch->h2 = hash_state_load(buf, buflen);
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free(buf);
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//DEBUGP("Reading m and n\n");
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fread(&(fch->m), sizeof(cmph_uint32), 1, f);
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fread(&(fch->c), sizeof(cmph_float32), 1, f);
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fread(&(fch->b), sizeof(cmph_uint32), 1, f);
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fread(&(fch->p1), sizeof(cmph_float32), 1, f);
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fread(&(fch->p2), sizeof(cmph_float32), 1, f);
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fch->g = (cmph_uint32 *)malloc(sizeof(cmph_uint32)*fch->b);
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fread(fch->g, fch->b*sizeof(cmph_uint32), 1, f);
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#ifdef DEBUG
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cmph_uint32 i;
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fprintf(stderr, "G: ");
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for (i = 0; i < fch->b; ++i) fprintf(stderr, "%u ", fch->g[i]);
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fprintf(stderr, "\n");
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#endif
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return;
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}
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|
||||
cmph_uint32 fch_search(cmph_t *mphf, const char *key, cmph_uint32 keylen)
|
||||
{
|
||||
fch_data_t *fch = mphf->data;
|
||||
cmph_uint32 h1 = hash(fch->h1, key, keylen) % fch->m;
|
||||
cmph_uint32 h2 = hash(fch->h2, key, keylen) % fch->m;
|
||||
h1 = hash(fch->h1, key, keylen) % fch->m;
|
||||
h1 = mixh10h11h12 (fch->b, fch->p1, fch->p2, h1);
|
||||
//DEBUGP("key: %s h1: %u h2: %u g[h1]: %u\n", key, h1, h2, fch->g[h1]);
|
||||
return (h2 + fch->g[h1]) % fch->m;
|
||||
}
|
||||
void fch_destroy(cmph_t *mphf)
|
||||
{
|
||||
fch_data_t *data = (fch_data_t *)mphf->data;
|
||||
free(data->g);
|
||||
hash_state_destroy(data->h1);
|
||||
hash_state_destroy(data->h2);
|
||||
free(data);
|
||||
free(mphf);
|
||||
}
|
||||
18
src/fch.h
Normal file
18
src/fch.h
Normal file
@ -0,0 +1,18 @@
|
||||
#ifndef __CMPH_FCH_H__
|
||||
#define __CMPH_FCH_H__
|
||||
|
||||
#include "cmph.h"
|
||||
|
||||
typedef struct __fch_data_t fch_data_t;
|
||||
typedef struct __fch_config_data_t fch_config_data_t;
|
||||
|
||||
fch_config_data_t *fch_config_new();
|
||||
void fch_config_set_hashfuncs(cmph_config_t *mph, CMPH_HASH *hashfuncs);
|
||||
void fch_config_destroy(cmph_config_t *mph);
|
||||
cmph_t *fch_new(cmph_config_t *mph, float c);
|
||||
|
||||
void fch_load(FILE *f, cmph_t *mphf);
|
||||
int fch_dump(cmph_t *mphf, FILE *f);
|
||||
void fch_destroy(cmph_t *mphf);
|
||||
cmph_uint32 fch_search(cmph_t *mphf, const char *key, cmph_uint32 keylen);
|
||||
#endif
|
||||
214
src/fch_buckets.c
Normal file
214
src/fch_buckets.c
Normal file
@ -0,0 +1,214 @@
|
||||
#include "vqueue.h"
|
||||
#include "fch_buckets.h"
|
||||
#include <stdio.h>
|
||||
#include <assert.h>
|
||||
#include <stdlib.h>
|
||||
//#define DEBUG
|
||||
#include "debug.h"
|
||||
|
||||
typedef struct __fch_bucket_entry_t
|
||||
{
|
||||
char * value;
|
||||
cmph_uint32 length;
|
||||
} fch_bucket_entry_t;
|
||||
|
||||
typedef struct __fch_bucket_t
|
||||
{
|
||||
fch_bucket_entry_t * entries;
|
||||
cmph_uint32 capacity, size;
|
||||
} fch_bucket_t;
|
||||
|
||||
|
||||
|
||||
static void fch_bucket_new(fch_bucket_t *bucket)
|
||||
{
|
||||
assert(bucket);
|
||||
bucket->size = 0;
|
||||
bucket->entries = NULL;
|
||||
bucket->capacity = 0;
|
||||
}
|
||||
|
||||
static void fch_bucket_destroy(fch_bucket_t *bucket)
|
||||
{
|
||||
cmph_uint32 i;
|
||||
assert(bucket);
|
||||
for (i = 0; i < bucket->size; i++)
|
||||
{
|
||||
free((bucket->entries + i)->value);
|
||||
}
|
||||
free(bucket->entries);
|
||||
}
|
||||
|
||||
|
||||
static void fch_bucket_reserve(fch_bucket_t *bucket, cmph_uint32 size)
|
||||
{
|
||||
assert(bucket);
|
||||
if (bucket->capacity < size)
|
||||
{
|
||||
cmph_uint32 new_capacity = bucket->capacity + 1;
|
||||
DEBUGP("Increasing current capacity %u to %u\n", bucket->capacity, size);
|
||||
while (new_capacity < size)
|
||||
{
|
||||
new_capacity *= 2;
|
||||
}
|
||||
bucket->entries = (fch_bucket_entry_t *)realloc(bucket->entries, sizeof(fch_bucket_entry_t)*new_capacity);
|
||||
assert(bucket->entries);
|
||||
bucket->capacity = new_capacity;
|
||||
DEBUGP("Increased\n");
|
||||
}
|
||||
}
|
||||
|
||||
static void fch_bucket_insert(fch_bucket_t *bucket, char *val, cmph_uint32 val_length)
|
||||
{
|
||||
assert(bucket);
|
||||
fch_bucket_reserve(bucket, bucket->size + 1);
|
||||
(bucket->entries + bucket->size)->value = val;
|
||||
(bucket->entries + bucket->size)->length = val_length;
|
||||
++(bucket->size);
|
||||
}
|
||||
|
||||
|
||||
static cmph_uint8 fch_bucket_is_empty(fch_bucket_t *bucket)
|
||||
{
|
||||
assert(bucket);
|
||||
return bucket->size == 0;
|
||||
}
|
||||
|
||||
static cmph_uint32 fch_bucket_size(fch_bucket_t *bucket)
|
||||
{
|
||||
assert(bucket);
|
||||
return bucket->size;
|
||||
}
|
||||
|
||||
static char * fch_bucket_get_key(fch_bucket_t *bucket, cmph_uint32 index_key)
|
||||
{
|
||||
assert(bucket); assert(index_key < bucket->size);
|
||||
return (bucket->entries + index_key)->value;
|
||||
}
|
||||
|
||||
static cmph_uint32 fch_bucket_get_length(fch_bucket_t *bucket, cmph_uint32 index_key)
|
||||
{
|
||||
assert(bucket); assert(index_key < bucket->size);
|
||||
return (bucket->entries + index_key)->length;
|
||||
}
|
||||
|
||||
static void fch_bucket_print(fch_bucket_t * bucket, cmph_uint32 index)
|
||||
{
|
||||
cmph_uint32 i;
|
||||
assert(bucket);
|
||||
fprintf(stderr, "Printing bucket %u ...\n", index);
|
||||
for (i = 0; i < bucket->size; i++)
|
||||
{
|
||||
fprintf(stderr, " key: %s\n", (bucket->entries + i)->value);
|
||||
}
|
||||
}
|
||||
|
||||
//////////////////////////////////////////////////////////////////////////////////////
|
||||
|
||||
struct __fch_buckets_t
|
||||
{
|
||||
fch_bucket_t * values;
|
||||
cmph_uint32 nbuckets, max_size;
|
||||
|
||||
};
|
||||
|
||||
fch_buckets_t * fch_buckets_new(cmph_uint32 nbuckets)
|
||||
{
|
||||
cmph_uint32 i;
|
||||
fch_buckets_t *buckets = (fch_buckets_t *)malloc(sizeof(fch_buckets_t));
|
||||
assert(buckets);
|
||||
buckets->values = (fch_bucket_t *)calloc(nbuckets, sizeof(fch_bucket_t));
|
||||
for (i = 0; i < nbuckets; i++) fch_bucket_new(buckets->values + i);
|
||||
assert(buckets->values);
|
||||
buckets->nbuckets = nbuckets;
|
||||
buckets->max_size = 0;
|
||||
return buckets;
|
||||
}
|
||||
|
||||
cmph_uint8 fch_buckets_is_empty(fch_buckets_t * buckets, cmph_uint32 index)
|
||||
{
|
||||
assert(index < buckets->nbuckets);
|
||||
return fch_bucket_is_empty(buckets->values + index);
|
||||
}
|
||||
|
||||
void fch_buckets_insert(fch_buckets_t * buckets, cmph_uint32 index, char * key, cmph_uint32 length)
|
||||
{
|
||||
assert(index < buckets->nbuckets);
|
||||
fch_bucket_insert(buckets->values + index, key, length);
|
||||
if (fch_bucket_size(buckets->values + index) > buckets->max_size)
|
||||
{
|
||||
buckets->max_size = fch_bucket_size(buckets->values + index);
|
||||
}
|
||||
}
|
||||
|
||||
cmph_uint32 fch_buckets_get_size(fch_buckets_t * buckets, cmph_uint32 index)
|
||||
{
|
||||
assert(index < buckets->nbuckets);
|
||||
return fch_bucket_size(buckets->values + index);
|
||||
}
|
||||
|
||||
|
||||
char * fch_buckets_get_key(fch_buckets_t * buckets, cmph_uint32 index, cmph_uint32 index_key)
|
||||
{
|
||||
assert(index < buckets->nbuckets);
|
||||
return fch_bucket_get_key(buckets->values + index, index_key);
|
||||
}
|
||||
|
||||
cmph_uint32 fch_buckets_get_keylength(fch_buckets_t * buckets, cmph_uint32 index, cmph_uint32 index_key)
|
||||
{
|
||||
assert(index < buckets->nbuckets);
|
||||
return fch_bucket_get_length(buckets->values + index, index_key);
|
||||
}
|
||||
|
||||
cmph_uint32 fch_buckets_get_max_size(fch_buckets_t * buckets)
|
||||
{
|
||||
return buckets->nbuckets;
|
||||
}
|
||||
|
||||
cmph_uint32 fch_buckets_get_nbuckets(fch_buckets_t * buckets)
|
||||
{
|
||||
return buckets->max_size;
|
||||
}
|
||||
|
||||
cmph_uint32 * fch_buckets_get_indexes_sorted_by_size(fch_buckets_t * buckets)
|
||||
{
|
||||
int i = 0;
|
||||
cmph_uint32 sum = 0, value;
|
||||
cmph_uint32 *nbuckets_size = (cmph_uint32 *) calloc(buckets->max_size + 1, sizeof(cmph_uint32));
|
||||
cmph_uint32 * sorted_indexes = (cmph_uint32 *) calloc(buckets->nbuckets, sizeof(cmph_uint32));
|
||||
|
||||
// collect how many buckets for each size.
|
||||
for(i = 0; i < buckets->nbuckets; i++) nbuckets_size[fch_bucket_size(buckets->values + i)] ++;
|
||||
|
||||
// calculating offset considering a decreasing order of buckets size.
|
||||
value = nbuckets_size[buckets->max_size];
|
||||
nbuckets_size[buckets->max_size] = sum;
|
||||
for(i = buckets->max_size - 1; i >= 0; i--)
|
||||
{
|
||||
sum += value;
|
||||
value = nbuckets_size[i];
|
||||
nbuckets_size[i] = sum;
|
||||
|
||||
}
|
||||
for(i = 0; i < buckets->nbuckets; i++)
|
||||
{
|
||||
sorted_indexes[nbuckets_size[fch_bucket_size(buckets->values + i)]] = i;
|
||||
nbuckets_size[fch_bucket_size(buckets->values + i)] ++;
|
||||
}
|
||||
free(nbuckets_size);
|
||||
return sorted_indexes;
|
||||
}
|
||||
|
||||
void fch_buckets_print(fch_buckets_t * buckets)
|
||||
{
|
||||
cmph_uint32 i;
|
||||
for (i = 0; i < buckets->nbuckets; i++) fch_bucket_print(buckets->values + i, i);
|
||||
}
|
||||
|
||||
void fch_buckets_destroy(fch_buckets_t * buckets)
|
||||
{
|
||||
cmph_uint32 i;
|
||||
for (i = 0; i < buckets->nbuckets; i++) fch_bucket_destroy(buckets->values + i);
|
||||
free(buckets->values);
|
||||
free(buckets);
|
||||
}
|
||||
30
src/fch_buckets.h
Normal file
30
src/fch_buckets.h
Normal file
@ -0,0 +1,30 @@
|
||||
#ifndef __CMPH_FCH_BUCKETS_H__
|
||||
#define __CMPH_FCH_BUCKETS_H__
|
||||
|
||||
#include "cmph_types.h"
|
||||
typedef struct __fch_buckets_t fch_buckets_t;
|
||||
|
||||
fch_buckets_t * fch_buckets_new(cmph_uint32 nbuckets);
|
||||
|
||||
cmph_uint8 fch_buckets_is_empty(fch_buckets_t * buckets, cmph_uint32 index);
|
||||
|
||||
void fch_buckets_insert(fch_buckets_t * buckets, cmph_uint32 index, char * key, cmph_uint32 length);
|
||||
|
||||
cmph_uint32 fch_buckets_get_size(fch_buckets_t * buckets, cmph_uint32 index);
|
||||
|
||||
char * fch_buckets_get_key(fch_buckets_t * buckets, cmph_uint32 index, cmph_uint32 index_key);
|
||||
|
||||
cmph_uint32 fch_buckets_get_keylength(fch_buckets_t * buckets, cmph_uint32 index, cmph_uint32 index_key);
|
||||
|
||||
// returns the size of biggest bucket.
|
||||
cmph_uint32 fch_buckets_get_max_size(fch_buckets_t * buckets);
|
||||
|
||||
// returns the number of buckets.
|
||||
cmph_uint32 fch_buckets_get_nbuckets(fch_buckets_t * buckets);
|
||||
|
||||
cmph_uint32 * fch_buckets_get_indexes_sorted_by_size(fch_buckets_t * buckets);
|
||||
|
||||
void fch_buckets_print(fch_buckets_t * buckets);
|
||||
|
||||
void fch_buckets_destroy(fch_buckets_t * buckets);
|
||||
#endif
|
||||
30
src/fch_structs.h
Executable file
30
src/fch_structs.h
Executable file
@ -0,0 +1,30 @@
|
||||
#ifndef __CMPH_FCH_STRUCTS_H__
|
||||
#define __CMPH_FCH_STRUCTS_H__
|
||||
|
||||
#include "hash_state.h"
|
||||
|
||||
struct __fch_data_t
|
||||
{
|
||||
cmph_uint32 m; // words count
|
||||
cmph_float32 c; // constant c
|
||||
cmph_uint32 b; // parameter b = ceil(c*m/(log(m)/log(2) + 1)). Don't need to be stored
|
||||
cmph_float32 p1; // constant p1 = ceil(0.6*m). Don't need to be stored
|
||||
cmph_float32 p2; // constant p2 = ceil(0.3*b). Don't need to be stored
|
||||
cmph_uint32 *g; // g function.
|
||||
hash_state_t *h1; // h10 function.
|
||||
hash_state_t *h2; // h20 function.
|
||||
};
|
||||
|
||||
struct __fch_config_data_t
|
||||
{
|
||||
CMPH_HASH hashfuncs[2];
|
||||
cmph_uint32 m; // words count
|
||||
cmph_float32 c; // constant c
|
||||
cmph_uint32 b; // parameter b = ceil(c*m/(log(m)/log(2) + 1)). Don't need to be stored
|
||||
cmph_float32 p1; // constant p1 = ceil(0.6*m). Don't need to be stored
|
||||
cmph_float32 p2; // constant p2 = ceil(0.3*b). Don't need to be stored
|
||||
cmph_uint32 *g; // g function.
|
||||
hash_state_t *h1; // h10 function.
|
||||
hash_state_t *h2; // h20 function.
|
||||
};
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user