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639 lines
20 KiB
C
639 lines
20 KiB
C
#include "graph.h"
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#include "bmz.h"
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#include "cmph_structs.h"
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#include "bmz_structs.h"
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#include "hash.h"
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#include "vqueue.h"
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#include "bitbool.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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#include <errno.h>
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//#define DEBUG
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#include "debug.h"
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static int bmz_gen_edges(cmph_config_t *mph);
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static cmph_uint8 bmz_traverse_critical_nodes(bmz_config_data_t *bmz, cmph_uint32 v, cmph_uint32 * biggest_g_value, cmph_uint32 * biggest_edge_value, cmph_uint8 * used_edges, cmph_uint8 * visited);
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static cmph_uint8 bmz_traverse_critical_nodes_heuristic(bmz_config_data_t *bmz, cmph_uint32 v, cmph_uint32 * biggest_g_value, cmph_uint32 * biggest_edge_value, cmph_uint8 * used_edges, cmph_uint8 * visited);
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static void bmz_traverse_non_critical_nodes(bmz_config_data_t *bmz, cmph_uint8 * used_edges, cmph_uint8 * visited);
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bmz_config_data_t *bmz_config_new(void)
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{
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bmz_config_data_t *bmz = NULL;
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bmz = (bmz_config_data_t *)malloc(sizeof(bmz_config_data_t));
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assert(bmz);
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memset(bmz, 0, sizeof(bmz_config_data_t));
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bmz->hashfuncs[0] = CMPH_HASH_JENKINS;
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bmz->hashfuncs[1] = CMPH_HASH_JENKINS;
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bmz->g = NULL;
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bmz->graph = NULL;
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bmz->hashes = NULL;
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return bmz;
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}
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void bmz_config_destroy(cmph_config_t *mph)
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{
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bmz_config_data_t *data = (bmz_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 bmz_config_set_hashfuncs(cmph_config_t *mph, CMPH_HASH *hashfuncs)
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{
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bmz_config_data_t *bmz = (bmz_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; //bmz only uses two hash functions
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bmz->hashfuncs[i] = *hashptr;
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++i, ++hashptr;
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}
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}
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cmph_t *bmz_new(cmph_config_t *mph, double c)
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{
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cmph_t *mphf = NULL;
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bmz_data_t *bmzf = NULL;
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cmph_uint32 i;
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cmph_uint32 iterations;
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cmph_uint32 iterations_map = 20;
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cmph_uint8 *used_edges = NULL;
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cmph_uint8 restart_mapping = 0;
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cmph_uint8 * visited = NULL;
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bmz_config_data_t *bmz = (bmz_config_data_t *)mph->data;
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if (c == 0) c = 1.15; // validating restrictions over parameter c.
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DEBUGP("c: %f\n", c);
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bmz->m = mph->key_source->nkeys;
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bmz->n = (cmph_uint32)ceil(c * mph->key_source->nkeys);
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DEBUGP("m (edges): %u n (vertices): %u c: %f\n", bmz->m, bmz->n, c);
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bmz->graph = graph_new(bmz->n, bmz->m);
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DEBUGP("Created graph\n");
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bmz->hashes = (hash_state_t **)malloc(sizeof(hash_state_t *)*3);
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for(i = 0; i < 3; ++i) bmz->hashes[i] = NULL;
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do
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{
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// Mapping step
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cmph_uint32 biggest_g_value = 0;
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cmph_uint32 biggest_edge_value = 1;
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iterations = 100;
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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 with graph sized %u\n", bmz->m, bmz->n);
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}
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while(1)
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{
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int ok;
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DEBUGP("hash function 1\n");
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bmz->hashes[0] = hash_state_new(bmz->hashfuncs[0], bmz->n);
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DEBUGP("hash function 2\n");
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bmz->hashes[1] = hash_state_new(bmz->hashfuncs[1], bmz->n);
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DEBUGP("Generating edges\n");
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ok = bmz_gen_edges(mph);
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if (!ok)
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{
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--iterations;
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hash_state_destroy(bmz->hashes[0]);
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bmz->hashes[0] = NULL;
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hash_state_destroy(bmz->hashes[1]);
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bmz->hashes[1] = NULL;
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DEBUGP("%u iterations remaining\n", iterations);
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if (mph->verbosity)
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{
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fprintf(stderr, "simple graph creation failure - %u iterations remaining\n", iterations);
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}
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if (iterations == 0) break;
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}
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else break;
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}
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if (iterations == 0)
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{
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graph_destroy(bmz->graph);
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return NULL;
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}
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// Ordering step
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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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graph_obtain_critical_nodes(bmz->graph);
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// Searching step
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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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fprintf(stderr, "\tTraversing critical vertices.\n");
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}
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DEBUGP("Searching step\n");
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visited = (cmph_uint8 *)malloc((size_t)bmz->n/8 + 1);
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memset(visited, 0, (size_t)bmz->n/8 + 1);
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used_edges = (cmph_uint8 *)malloc((size_t)bmz->m/8 + 1);
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memset(used_edges, 0, (size_t)bmz->m/8 + 1);
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free(bmz->g);
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bmz->g = (cmph_uint32 *)calloc((size_t)bmz->n, sizeof(cmph_uint32));
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assert(bmz->g);
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for (i = 0; i < bmz->n; ++i) // critical nodes
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{
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if (graph_node_is_critical(bmz->graph, i) && (!GETBIT(visited,i)))
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{
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if(c > 1.14) restart_mapping = bmz_traverse_critical_nodes(bmz, i, &biggest_g_value, &biggest_edge_value, used_edges, visited);
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else restart_mapping = bmz_traverse_critical_nodes_heuristic(bmz, i, &biggest_g_value, &biggest_edge_value, used_edges, visited);
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if(restart_mapping) break;
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}
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}
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if(!restart_mapping)
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{
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if (mph->verbosity)
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{
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fprintf(stderr, "\tTraversing non critical vertices.\n");
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}
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bmz_traverse_non_critical_nodes(bmz, used_edges, visited); // non_critical_nodes
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}
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else
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{
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iterations_map--;
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if (mph->verbosity) fprintf(stderr, "Restarting mapping step. %u iterations remaining.\n", iterations_map);
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}
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free(used_edges);
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free(visited);
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}while(restart_mapping && iterations_map > 0);
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graph_destroy(bmz->graph);
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bmz->graph = NULL;
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if (iterations_map == 0)
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{
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return NULL;
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}
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mphf = (cmph_t *)malloc(sizeof(cmph_t));
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mphf->algo = mph->algo;
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bmzf = (bmz_data_t *)malloc(sizeof(bmz_data_t));
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bmzf->g = bmz->g;
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bmz->g = NULL; //transfer memory ownership
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bmzf->hashes = bmz->hashes;
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bmz->hashes = NULL; //transfer memory ownership
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bmzf->n = bmz->n;
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bmzf->m = bmz->m;
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mphf->data = bmzf;
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mphf->size = bmz->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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static cmph_uint8 bmz_traverse_critical_nodes(bmz_config_data_t *bmz, cmph_uint32 v, cmph_uint32 * biggest_g_value, cmph_uint32 * biggest_edge_value, cmph_uint8 * used_edges, cmph_uint8 * visited)
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{
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cmph_uint32 next_g;
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cmph_uint32 u; /* Auxiliary vertex */
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cmph_uint32 lav; /* lookahead vertex */
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cmph_uint8 collision;
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vqueue_t * q = vqueue_new((cmph_uint32)(graph_ncritical_nodes(bmz->graph)) + 1);
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graph_iterator_t it, it1;
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DEBUGP("Labelling critical vertices\n");
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bmz->g[v] = (cmph_uint32)ceil ((double)(*biggest_edge_value)/2) - 1;
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SETBIT(visited, v);
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next_g = (cmph_uint32)floor((double)(*biggest_edge_value/2)); /* next_g is incremented in the do..while statement*/
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vqueue_insert(q, v);
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while(!vqueue_is_empty(q))
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{
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v = vqueue_remove(q);
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it = graph_neighbors_it(bmz->graph, v);
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while ((u = graph_next_neighbor(bmz->graph, &it)) != GRAPH_NO_NEIGHBOR)
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{
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if (graph_node_is_critical(bmz->graph, u) && (!GETBIT(visited,u)))
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{
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collision = 1;
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while(collision) // lookahead to resolve collisions
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{
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next_g = *biggest_g_value + 1;
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it1 = graph_neighbors_it(bmz->graph, u);
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collision = 0;
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while((lav = graph_next_neighbor(bmz->graph, &it1)) != GRAPH_NO_NEIGHBOR)
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{
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if (graph_node_is_critical(bmz->graph, lav) && GETBIT(visited,lav))
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{
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if(next_g + bmz->g[lav] >= bmz->m)
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{
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vqueue_destroy(q);
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return 1; // restart mapping step.
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}
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if (GETBIT(used_edges, (next_g + bmz->g[lav])))
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{
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collision = 1;
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break;
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}
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}
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}
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if (next_g > *biggest_g_value) *biggest_g_value = next_g;
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}
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// Marking used edges...
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it1 = graph_neighbors_it(bmz->graph, u);
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while((lav = graph_next_neighbor(bmz->graph, &it1)) != GRAPH_NO_NEIGHBOR)
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{
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if (graph_node_is_critical(bmz->graph, lav) && GETBIT(visited, lav))
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{
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SETBIT(used_edges,(next_g + bmz->g[lav]));
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if(next_g + bmz->g[lav] > *biggest_edge_value) *biggest_edge_value = next_g + bmz->g[lav];
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}
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}
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bmz->g[u] = next_g; // Labelling vertex u.
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SETBIT(visited,u);
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vqueue_insert(q, u);
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}
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}
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}
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vqueue_destroy(q);
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return 0;
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}
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static cmph_uint8 bmz_traverse_critical_nodes_heuristic(bmz_config_data_t *bmz, cmph_uint32 v, cmph_uint32 * biggest_g_value, cmph_uint32 * biggest_edge_value, cmph_uint8 * used_edges, cmph_uint8 * visited)
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{
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cmph_uint32 next_g;
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cmph_uint32 u; /* Auxiliary vertex */
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cmph_uint32 lav; /* lookahead vertex */
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cmph_uint8 collision;
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cmph_uint32 * unused_g_values = NULL;
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cmph_uint32 unused_g_values_capacity = 0;
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cmph_uint32 nunused_g_values = 0;
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vqueue_t * q = vqueue_new((cmph_uint32)(0.5*graph_ncritical_nodes(bmz->graph))+1);
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graph_iterator_t it, it1;
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DEBUGP("Labelling critical vertices\n");
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bmz->g[v] = (cmph_uint32)ceil ((double)(*biggest_edge_value)/2) - 1;
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SETBIT(visited, v);
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next_g = (cmph_uint32)floor((double)(*biggest_edge_value/2)); /* next_g is incremented in the do..while statement*/
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vqueue_insert(q, v);
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while(!vqueue_is_empty(q))
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{
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v = vqueue_remove(q);
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it = graph_neighbors_it(bmz->graph, v);
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while ((u = graph_next_neighbor(bmz->graph, &it)) != GRAPH_NO_NEIGHBOR)
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{
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if (graph_node_is_critical(bmz->graph, u) && (!GETBIT(visited,u)))
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{
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cmph_uint32 next_g_index = 0;
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collision = 1;
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while(collision) // lookahead to resolve collisions
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{
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if (next_g_index < nunused_g_values)
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{
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next_g = unused_g_values[next_g_index++];
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}
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else
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{
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next_g = *biggest_g_value + 1;
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next_g_index = UINT_MAX;
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}
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it1 = graph_neighbors_it(bmz->graph, u);
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collision = 0;
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while((lav = graph_next_neighbor(bmz->graph, &it1)) != GRAPH_NO_NEIGHBOR)
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{
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if (graph_node_is_critical(bmz->graph, lav) && GETBIT(visited,lav))
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{
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if(next_g + bmz->g[lav] >= bmz->m)
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{
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vqueue_destroy(q);
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free(unused_g_values);
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return 1; // restart mapping step.
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}
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if (GETBIT(used_edges, (next_g + bmz->g[lav])))
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{
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collision = 1;
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break;
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}
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}
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}
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if(collision && (next_g > *biggest_g_value)) // saving the current g value stored in next_g.
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{
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if(nunused_g_values == unused_g_values_capacity)
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{
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unused_g_values = (cmph_uint32 *)realloc(unused_g_values, (unused_g_values_capacity + BUFSIZ)*sizeof(cmph_uint32));
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unused_g_values_capacity += BUFSIZ;
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}
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unused_g_values[nunused_g_values++] = next_g;
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}
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if (next_g > *biggest_g_value) *biggest_g_value = next_g;
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}
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next_g_index--;
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if (next_g_index < nunused_g_values) unused_g_values[next_g_index] = unused_g_values[--nunused_g_values];
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// Marking used edges...
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it1 = graph_neighbors_it(bmz->graph, u);
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while((lav = graph_next_neighbor(bmz->graph, &it1)) != GRAPH_NO_NEIGHBOR)
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{
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if (graph_node_is_critical(bmz->graph, lav) && GETBIT(visited, lav))
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{
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SETBIT(used_edges,(next_g + bmz->g[lav]));
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if(next_g + bmz->g[lav] > *biggest_edge_value) *biggest_edge_value = next_g + bmz->g[lav];
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}
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}
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bmz->g[u] = next_g; // Labelling vertex u.
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SETBIT(visited, u);
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vqueue_insert(q, u);
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}
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}
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}
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vqueue_destroy(q);
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free(unused_g_values);
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return 0;
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}
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static cmph_uint32 next_unused_edge(bmz_config_data_t *bmz, cmph_uint8 * used_edges, cmph_uint32 unused_edge_index)
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{
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while(1)
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{
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assert(unused_edge_index < bmz->m);
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if(GETBIT(used_edges, unused_edge_index)) unused_edge_index ++;
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else break;
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}
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return unused_edge_index;
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}
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static void bmz_traverse(bmz_config_data_t *bmz, cmph_uint8 * used_edges, cmph_uint32 v, cmph_uint32 * unused_edge_index, cmph_uint8 * visited)
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{
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graph_iterator_t it = graph_neighbors_it(bmz->graph, v);
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cmph_uint32 neighbor = 0;
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while((neighbor = graph_next_neighbor(bmz->graph, &it)) != GRAPH_NO_NEIGHBOR)
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{
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if(GETBIT(visited,neighbor)) continue;
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//DEBUGP("Visiting neighbor %u\n", neighbor);
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*unused_edge_index = next_unused_edge(bmz, used_edges, *unused_edge_index);
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bmz->g[neighbor] = *unused_edge_index - bmz->g[v];
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//if (bmz->g[neighbor] >= bmz->m) bmz->g[neighbor] += bmz->m;
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SETBIT(visited, neighbor);
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(*unused_edge_index)++;
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bmz_traverse(bmz, used_edges, neighbor, unused_edge_index, visited);
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}
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}
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static void bmz_traverse_non_critical_nodes(bmz_config_data_t *bmz, cmph_uint8 * used_edges, cmph_uint8 * visited)
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{
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cmph_uint32 i, v1, v2, unused_edge_index = 0;
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DEBUGP("Labelling non critical vertices\n");
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for(i = 0; i < bmz->m; i++)
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{
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v1 = graph_vertex_id(bmz->graph, i, 0);
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v2 = graph_vertex_id(bmz->graph, i, 1);
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if((GETBIT(visited,v1) && GETBIT(visited,v2)) || (!GETBIT(visited,v1) && !GETBIT(visited,v2))) continue;
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if(GETBIT(visited,v1)) bmz_traverse(bmz, used_edges, v1, &unused_edge_index, visited);
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else bmz_traverse(bmz, used_edges, v2, &unused_edge_index, visited);
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}
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for(i = 0; i < bmz->n; i++)
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{
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if(!GETBIT(visited,i))
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{
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bmz->g[i] = 0;
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SETBIT(visited, i);
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bmz_traverse(bmz, used_edges, i, &unused_edge_index, visited);
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}
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}
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}
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static int bmz_gen_edges(cmph_config_t *mph)
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{
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cmph_uint32 e;
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bmz_config_data_t *bmz = (bmz_config_data_t *)mph->data;
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cmph_uint8 multiple_edges = 0;
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DEBUGP("Generating edges for %u vertices\n", bmz->n);
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graph_clear_edges(bmz->graph);
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mph->key_source->rewind(mph->key_source->data);
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for (e = 0; e < mph->key_source->nkeys; ++e)
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{
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cmph_uint32 h1, h2;
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cmph_uint32 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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|
|
// if (key == NULL)fprintf(stderr, "key = %s -- read BMZ\n", key);
|
|
h1 = hash(bmz->hashes[0], key, keylen) % bmz->n;
|
|
h2 = hash(bmz->hashes[1], key, keylen) % bmz->n;
|
|
if (h1 == h2) if (++h2 >= bmz->n) h2 = 0;
|
|
if (h1 == h2)
|
|
{
|
|
if (mph->verbosity) fprintf(stderr, "Self loop for key %u\n", e);
|
|
mph->key_source->dispose(mph->key_source->data, key, keylen);
|
|
return 0;
|
|
}
|
|
//DEBUGP("Adding edge: %u -> %u for key %s\n", h1, h2, key);
|
|
mph->key_source->dispose(mph->key_source->data, key, keylen);
|
|
// fprintf(stderr, "key = %s -- dispose BMZ\n", key);
|
|
multiple_edges = graph_contains_edge(bmz->graph, h1, h2);
|
|
if (mph->verbosity && multiple_edges) fprintf(stderr, "A non simple graph was generated\n");
|
|
if (multiple_edges) return 0; // checking multiple edge restriction.
|
|
graph_add_edge(bmz->graph, h1, h2);
|
|
}
|
|
return !multiple_edges;
|
|
}
|
|
|
|
int bmz_dump(cmph_t *mphf, FILE *fd)
|
|
{
|
|
char *buf = NULL;
|
|
cmph_uint32 buflen;
|
|
cmph_uint32 two = 2; //number of hash functions
|
|
bmz_data_t *data = (bmz_data_t *)mphf->data;
|
|
register size_t nbytes;
|
|
#ifdef DEBUG
|
|
cmph_uint32 i;
|
|
#endif
|
|
|
|
__cmph_dump(mphf, fd);
|
|
|
|
nbytes = fwrite(&two, sizeof(cmph_uint32), (size_t)1, fd);
|
|
|
|
hash_state_dump(data->hashes[0], &buf, &buflen);
|
|
DEBUGP("Dumping hash state with %u bytes to disk\n", buflen);
|
|
nbytes = fwrite(&buflen, sizeof(cmph_uint32), (size_t)1, fd);
|
|
nbytes = fwrite(buf, (size_t)buflen, (size_t)1, fd);
|
|
free(buf);
|
|
|
|
hash_state_dump(data->hashes[1], &buf, &buflen);
|
|
DEBUGP("Dumping hash state with %u bytes to disk\n", buflen);
|
|
nbytes = fwrite(&buflen, sizeof(cmph_uint32), (size_t)1, fd);
|
|
nbytes = fwrite(buf, (size_t)buflen, (size_t)1, fd);
|
|
free(buf);
|
|
|
|
nbytes = fwrite(&(data->n), sizeof(cmph_uint32), (size_t)1, fd);
|
|
nbytes = fwrite(&(data->m), sizeof(cmph_uint32), (size_t)1, fd);
|
|
|
|
nbytes = fwrite(data->g, sizeof(cmph_uint32)*(data->n), (size_t)1, fd);
|
|
if (nbytes == 0 && ferror(fd)) {
|
|
fprintf(stderr, "ERROR: %s\n", strerror(errno));
|
|
return 0;
|
|
}
|
|
#ifdef DEBUG
|
|
fprintf(stderr, "G: ");
|
|
for (i = 0; i < data->n; ++i) fprintf(stderr, "%u ", data->g[i]);
|
|
fprintf(stderr, "\n");
|
|
#endif
|
|
return 1;
|
|
}
|
|
|
|
void bmz_load(FILE *f, cmph_t *mphf)
|
|
{
|
|
cmph_uint32 nhashes;
|
|
char *buf = NULL;
|
|
cmph_uint32 buflen;
|
|
cmph_uint32 i;
|
|
bmz_data_t *bmz = (bmz_data_t *)malloc(sizeof(bmz_data_t));
|
|
register size_t nbytes;
|
|
DEBUGP("Loading bmz mphf\n");
|
|
mphf->data = bmz;
|
|
nbytes = fread(&nhashes, sizeof(cmph_uint32), (size_t)1, f);
|
|
bmz->hashes = (hash_state_t **)malloc(sizeof(hash_state_t *)*(nhashes + 1));
|
|
bmz->hashes[nhashes] = NULL;
|
|
DEBUGP("Reading %u hashes\n", nhashes);
|
|
for (i = 0; i < nhashes; ++i)
|
|
{
|
|
hash_state_t *state = NULL;
|
|
nbytes = fread(&buflen, sizeof(cmph_uint32), (size_t)1, f);
|
|
DEBUGP("Hash state has %u bytes\n", buflen);
|
|
buf = (char *)malloc((size_t)buflen);
|
|
nbytes = fread(buf, (size_t)buflen, (size_t)1, f);
|
|
state = hash_state_load(buf, buflen);
|
|
bmz->hashes[i] = state;
|
|
free(buf);
|
|
}
|
|
|
|
DEBUGP("Reading m and n\n");
|
|
nbytes = fread(&(bmz->n), sizeof(cmph_uint32), (size_t)1, f);
|
|
nbytes = fread(&(bmz->m), sizeof(cmph_uint32), (size_t)1, f);
|
|
|
|
bmz->g = (cmph_uint32 *)malloc(sizeof(cmph_uint32)*bmz->n);
|
|
nbytes = fread(bmz->g, bmz->n*sizeof(cmph_uint32), (size_t)1, f);
|
|
if (nbytes == 0 && ferror(f)) {
|
|
fprintf(stderr, "ERROR: %s\n", strerror(errno));
|
|
return;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
fprintf(stderr, "G: ");
|
|
for (i = 0; i < bmz->n; ++i) fprintf(stderr, "%u ", bmz->g[i]);
|
|
fprintf(stderr, "\n");
|
|
#endif
|
|
return;
|
|
}
|
|
|
|
|
|
cmph_uint32 bmz_search(cmph_t *mphf, const char *key, cmph_uint32 keylen)
|
|
{
|
|
bmz_data_t *bmz = mphf->data;
|
|
cmph_uint32 h1 = hash(bmz->hashes[0], key, keylen) % bmz->n;
|
|
cmph_uint32 h2 = hash(bmz->hashes[1], key, keylen) % bmz->n;
|
|
DEBUGP("key: %s h1: %u h2: %u\n", key, h1, h2);
|
|
if (h1 == h2 && ++h2 > bmz->n) h2 = 0;
|
|
DEBUGP("key: %s g[h1]: %u g[h2]: %u edges: %u\n", key, bmz->g[h1], bmz->g[h2], bmz->m);
|
|
return bmz->g[h1] + bmz->g[h2];
|
|
}
|
|
void bmz_destroy(cmph_t *mphf)
|
|
{
|
|
bmz_data_t *data = (bmz_data_t *)mphf->data;
|
|
free(data->g);
|
|
hash_state_destroy(data->hashes[0]);
|
|
hash_state_destroy(data->hashes[1]);
|
|
free(data->hashes);
|
|
free(data);
|
|
free(mphf);
|
|
}
|
|
|
|
/** \fn void bmz_pack(cmph_t *mphf, void *packed_mphf);
|
|
* \brief Support the ability to pack a perfect hash function into a preallocated contiguous memory space pointed by packed_mphf.
|
|
* \param mphf pointer to the resulting mphf
|
|
* \param packed_mphf pointer to the contiguous memory area used to store the resulting mphf. The size of packed_mphf must be at least cmph_packed_size()
|
|
*/
|
|
void bmz_pack(cmph_t *mphf, void *packed_mphf)
|
|
{
|
|
|
|
bmz_data_t *data = (bmz_data_t *)mphf->data;
|
|
cmph_uint8 * ptr = packed_mphf;
|
|
CMPH_HASH h2_type;
|
|
|
|
// packing h1 type
|
|
CMPH_HASH h1_type = hash_get_type(data->hashes[0]);
|
|
*((cmph_uint32 *) ptr) = h1_type;
|
|
ptr += sizeof(cmph_uint32);
|
|
|
|
// packing h1
|
|
hash_state_pack(data->hashes[0], ptr);
|
|
ptr += hash_state_packed_size(h1_type);
|
|
|
|
// packing h2 type
|
|
h2_type = hash_get_type(data->hashes[1]);
|
|
*((cmph_uint32 *) ptr) = h2_type;
|
|
ptr += sizeof(cmph_uint32);
|
|
|
|
// packing h2
|
|
hash_state_pack(data->hashes[1], ptr);
|
|
ptr += hash_state_packed_size(h2_type);
|
|
|
|
// packing n
|
|
*((cmph_uint32 *) ptr) = data->n;
|
|
ptr += sizeof(data->n);
|
|
|
|
// packing g
|
|
memcpy(ptr, data->g, sizeof(cmph_uint32)*data->n);
|
|
}
|
|
|
|
/** \fn cmph_uint32 bmz_packed_size(cmph_t *mphf);
|
|
* \brief Return the amount of space needed to pack mphf.
|
|
* \param mphf pointer to a mphf
|
|
* \return the size of the packed function or zero for failures
|
|
*/
|
|
cmph_uint32 bmz_packed_size(cmph_t *mphf)
|
|
{
|
|
bmz_data_t *data = (bmz_data_t *)mphf->data;
|
|
CMPH_HASH h1_type = hash_get_type(data->hashes[0]);
|
|
CMPH_HASH h2_type = hash_get_type(data->hashes[1]);
|
|
|
|
return (cmph_uint32)(sizeof(CMPH_ALGO) + hash_state_packed_size(h1_type) + hash_state_packed_size(h2_type) +
|
|
3*sizeof(cmph_uint32) + sizeof(cmph_uint32)*data->n);
|
|
}
|
|
|
|
/** cmph_uint32 bmz_search(void *packed_mphf, const char *key, cmph_uint32 keylen);
|
|
* \brief Use the packed mphf to do a search.
|
|
* \param packed_mphf pointer to the packed mphf
|
|
* \param key key to be hashed
|
|
* \param keylen key length in bytes
|
|
* \return The mphf value
|
|
*/
|
|
cmph_uint32 bmz_search_packed(void *packed_mphf, const char *key, cmph_uint32 keylen)
|
|
{
|
|
register cmph_uint8 *h1_ptr = packed_mphf;
|
|
register CMPH_HASH h1_type = *((cmph_uint32 *)h1_ptr);
|
|
register cmph_uint8 *h2_ptr;
|
|
register CMPH_HASH h2_type;
|
|
register cmph_uint32 *g_ptr, n, h1, h2;
|
|
|
|
h1_ptr += 4;
|
|
|
|
h2_ptr = h1_ptr + hash_state_packed_size(h1_type);
|
|
h2_type = *((cmph_uint32 *)h2_ptr);
|
|
h2_ptr += 4;
|
|
|
|
g_ptr = (cmph_uint32 *)(h2_ptr + hash_state_packed_size(h2_type));
|
|
|
|
n = *g_ptr++;
|
|
|
|
h1 = hash_packed(h1_ptr, h1_type, key, keylen) % n;
|
|
h2 = hash_packed(h2_ptr, h2_type, key, keylen) % n;
|
|
if (h1 == h2 && ++h2 > n) h2 = 0;
|
|
return (g_ptr[h1] + g_ptr[h2]);
|
|
}
|