The czech.h, czech_structs.h and czech.c files were removed
This commit is contained in:
fc_botelho
parent
d7ea6d6a3e
commit
ff1b59d7c7
317
src/czech.c
317
src/czech.c
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#include "graph.h"
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#include "czech.h"
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#include "cmph_structs.h"
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#include "czech_structs.h"
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#include "hash.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 <netinet/in.h>
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//#define DEBUG
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#include "debug.h"
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/* static const char bitmask[8] = { 1, 1 << 1, 1 << 2, 1 << 3, 1 << 4, 1 << 5, 1 << 6, 1 << 7 }; */
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/* #define GETBIT(array, i) (array[(i) / 8] & bitmask[(i) % 8]) */
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/* #define SETBIT(array, i) (array[(i) / 8] |= bitmask[(i) % 8]) */
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/* #define UNSETBIT(array, i) (array[(i) / 8] &= (~(bitmask[(i) % 8]))) */
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static int czech_gen_edges(cmph_config_t *mph);
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static void czech_traverse(czech_config_data_t *czech, cmph_uint8 *visited, cmph_uint32 v);
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czech_config_data_t *czech_config_new(cmph_io_adapter_t *key_source)
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{
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czech_config_data_t *czech = NULL;
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czech = (czech_config_data_t *)malloc(sizeof(czech_config_data_t));
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czech->hashfuncs[0] = CMPH_HASH_JENKINS;
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czech->hashfuncs[1] = CMPH_HASH_JENKINS;
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czech->g = NULL;
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czech->graph = NULL;
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czech->hashes = NULL;
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assert(czech);
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return czech;
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}
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void czech_config_destroy(cmph_config_t *mph)
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{
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czech_config_data_t *data = (czech_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 czech_config_set_hashfuncs(cmph_config_t *mph, CMPH_HASH *hashfuncs)
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{
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czech_config_data_t *czech = (czech_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; //czech only uses two hash functions
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czech->hashfuncs[i] = *hashptr;
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++i, ++hashptr;
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}
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}
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cmph_t *czech_new(cmph_config_t *mph, float c)
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{
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cmph_t *mphf = NULL;
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czech_data_t *czechf = NULL;
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cmph_uint32 i;
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cmph_uint32 iterations = 20;
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cmph_uint8 *visited = NULL;
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czech_config_data_t *czech = (czech_config_data_t *)mph->data;
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czech->m = mph->key_source->nkeys;
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czech->n = ceil(c * mph->key_source->nkeys);
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DEBUGP("m (edges): %u n (vertices): %u c: %f\n", czech->m, czech->n, c);
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czech->graph = graph_new(czech->n, czech->m);
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DEBUGP("Created graph\n");
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czech->hashes = (hash_state_t **)malloc(sizeof(hash_state_t *)*3);
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for(i = 0; i < 3; ++i) czech->hashes[i] = NULL;
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//Mapping step
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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", czech->m, czech->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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czech->hashes[0] = hash_state_new(czech->hashfuncs[0], czech->n);
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czech->hashes[1] = hash_state_new(czech->hashfuncs[1], czech->n);
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ok = czech_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(czech->hashes[0]);
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czech->hashes[0] = NULL;
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hash_state_destroy(czech->hashes[1]);
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czech->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, "Acyclic 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(czech->graph);
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return NULL;
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}
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//Assignment step
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if (mph->verbosity)
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{
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fprintf(stderr, "Starting assignment step\n");
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}
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DEBUGP("Assignment step\n");
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visited = (char *)malloc(czech->n/8 + 1);
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memset(visited, 0, czech->n/8 + 1);
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free(czech->g);
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czech->g = malloc(czech->n * sizeof(cmph_uint32));
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assert(czech->g);
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for (i = 0; i < czech->n; ++i)
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{
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if (!GETBIT(visited,i))
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{
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czech->g[i] = 0;
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czech_traverse(czech, visited, i);
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}
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}
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graph_destroy(czech->graph);
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free(visited);
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czech->graph = NULL;
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mphf = (cmph_t *)malloc(sizeof(cmph_t));
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mphf->algo = mph->algo;
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czechf = (czech_data_t *)malloc(sizeof(czech_config_data_t));
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czechf->g = czech->g;
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czech->g = NULL; //transfer memory ownership
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czechf->hashes = czech->hashes;
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czech->hashes = NULL; //transfer memory ownership
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czechf->n = czech->n;
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czechf->m = czech->m;
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mphf->data = czechf;
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mphf->size = czech->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 void czech_traverse(czech_config_data_t *czech, cmph_uint8 *visited, cmph_uint32 v)
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{
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graph_iterator_t it = graph_neighbors_it(czech->graph, v);
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cmph_uint32 neighbor = 0;
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SETBIT(visited,v);
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DEBUGP("Visiting vertex %u\n", v);
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while((neighbor = graph_next_neighbor(czech->graph, &it)) != GRAPH_NO_NEIGHBOR)
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{
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DEBUGP("Visiting neighbor %u\n", neighbor);
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if(GETBIT(visited,neighbor)) continue;
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DEBUGP("Visiting neighbor %u\n", neighbor);
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DEBUGP("Visiting edge %u->%u with id %u\n", v, neighbor, graph_edge_id(czech->graph, v, neighbor));
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czech->g[neighbor] = graph_edge_id(czech->graph, v, neighbor) - czech->g[v];
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DEBUGP("g is %u (%u - %u mod %u)\n", czech->g[neighbor], graph_edge_id(czech->graph, v, neighbor), czech->g[v], czech->m);
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czech_traverse(czech, visited, neighbor);
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}
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}
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static int czech_gen_edges(cmph_config_t *mph)
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{
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cmph_uint32 e;
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czech_config_data_t *czech = (czech_config_data_t *)mph->data;
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int cycles = 0;
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DEBUGP("Generating edges for %u vertices\n", czech->n);
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graph_clear_edges(czech->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;
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mph->key_source->read(mph->key_source->data, &key, &keylen);
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h1 = hash(czech->hashes[0], key, keylen) % czech->n;
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h2 = hash(czech->hashes[1], key, keylen) % czech->n;
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if (h1 == h2) if (++h2 >= czech->n) h2 = 0;
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if (h1 == h2)
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{
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if (mph->verbosity) fprintf(stderr, "Self loop for key %e\n", e);
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mph->key_source->dispose(mph->key_source->data, key, keylen);
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return 0;
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}
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DEBUGP("Adding edge: %u -> %u for key %s\n", h1, h2, key);
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mph->key_source->dispose(mph->key_source->data, key, keylen);
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graph_add_edge(czech->graph, h1, h2);
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}
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cycles = graph_is_cyclic(czech->graph);
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if (mph->verbosity && cycles) fprintf(stderr, "Cyclic graph generated\n");
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DEBUGP("Looking for cycles: %u\n", cycles);
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return ! cycles;
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}
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int czech_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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cmph_uint32 nbuflen;
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cmph_uint32 i;
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cmph_uint32 two = htonl(2); //number of hash functions
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czech_data_t *data = (czech_data_t *)mphf->data;
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cmph_uint32 nn, nm;
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__cmph_dump(mphf, fd);
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fwrite(&two, sizeof(cmph_uint32), 1, fd);
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hash_state_dump(data->hashes[0], &buf, &buflen);
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DEBUGP("Dumping hash state with %u bytes to disk\n", buflen);
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nbuflen = htonl(buflen);
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fwrite(&nbuflen, 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->hashes[1], &buf, &buflen);
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DEBUGP("Dumping hash state with %u bytes to disk\n", buflen);
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nbuflen = htonl(buflen);
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fwrite(&nbuflen, sizeof(cmph_uint32), 1, fd);
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fwrite(buf, buflen, 1, fd);
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free(buf);
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nn = htonl(data->n);
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fwrite(&nn, sizeof(cmph_uint32), 1, fd);
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nm = htonl(data->m);
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fwrite(&nm, sizeof(cmph_uint32), 1, fd);
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for (i = 0; i < data->n; ++i)
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{
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cmph_uint32 ng = htonl(data->g[i]);
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fwrite(&ng, sizeof(cmph_uint32), 1, fd);
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}
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#ifdef DEBUG
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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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#endif
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return 1;
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}
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void czech_load(FILE *f, cmph_t *mphf)
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{
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cmph_uint32 nhashes;
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char fbuf[BUFSIZ];
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char *buf = NULL;
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cmph_uint32 buflen;
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cmph_uint32 i;
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hash_state_t *state;
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czech_data_t *czech = (czech_data_t *)malloc(sizeof(czech_data_t));
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DEBUGP("Loading czech mphf\n");
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mphf->data = czech;
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fread(&nhashes, sizeof(cmph_uint32), 1, f);
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nhashes = ntohl(nhashes);
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czech->hashes = (hash_state_t **)malloc(sizeof(hash_state_t *)*(nhashes + 1));
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czech->hashes[nhashes] = NULL;
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DEBUGP("Reading %u hashes\n", nhashes);
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for (i = 0; i < nhashes; ++i)
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{
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hash_state_t *state = NULL;
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fread(&buflen, sizeof(cmph_uint32), 1, f);
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buflen = ntohl(buflen);
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DEBUGP("Hash state 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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state = hash_state_load(buf, buflen);
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czech->hashes[i] = state;
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free(buf);
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}
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DEBUGP("Reading m and n\n");
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fread(&(czech->n), sizeof(cmph_uint32), 1, f);
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czech->n = ntohl(czech->n);
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fread(&(czech->m), sizeof(cmph_uint32), 1, f);
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czech->m = ntohl(czech->m);
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czech->g = (cmph_uint32 *)malloc(sizeof(cmph_uint32)*czech->n);
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fread(czech->g, czech->n*sizeof(cmph_uint32), 1, f);
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for (i = 0; i < czech->n; ++i) czech->g[i] = ntohl(czech->g[i]);
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#ifdef DEBUG
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fprintf(stderr, "G: ");
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for (i = 0; i < czech->n; ++i) fprintf(stderr, "%u ", czech->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 czech_search(cmph_t *mphf, const char *key, cmph_uint32 keylen)
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{
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czech_data_t *czech = mphf->data;
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cmph_uint32 h1 = hash(czech->hashes[0], key, keylen) % czech->n;
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cmph_uint32 h2 = hash(czech->hashes[1], key, keylen) % czech->n;
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DEBUGP("key: %s h1: %u h2: %u\n", key, h1, h2);
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if (h1 == h2 && ++h2 > czech->n) h2 = 0;
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DEBUGP("key: %s g[h1]: %u g[h2]: %u edges: %u\n", key, czech->g[h1], czech->g[h2], czech->m);
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return (czech->g[h1] + czech->g[h2]) % czech->m;
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}
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void czech_destroy(cmph_t *mphf)
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{
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czech_data_t *data = (czech_data_t *)mphf->data;
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free(data->g);
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hash_state_destroy(data->hashes[0]);
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hash_state_destroy(data->hashes[1]);
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free(data->hashes);
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free(data);
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free(mphf);
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}
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18
src/czech.h
18
src/czech.h
@ -1,18 +0,0 @@
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#ifndef __CMPH_CZECH_H__
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#define __CMPH_CZECH_H__
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#include "cmph.h"
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typedef struct __czech_data_t czech_data_t;
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typedef struct __czech_config_data_t czech_config_data_t;
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czech_config_data_t *czech_config_new(cmph_io_adapter_t *key_source);
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void czech_config_set_hashfuncs(cmph_config_t *mph, CMPH_HASH *hashfuncs);
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void czech_config_destroy(cmph_config_t *mph);
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cmph_t *czech_new(cmph_config_t *mph, float c);
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void czech_load(FILE *f, cmph_t *mphf);
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int czech_dump(cmph_t *mphf, FILE *f);
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void czech_destroy(cmph_t *mphf);
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cmph_uint32 czech_search(cmph_t *mphf, const char *key, cmph_uint32 keylen);
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#endif
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@ -1,24 +0,0 @@
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#ifndef __CMPH_CZECH_STRUCTS_H__
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#define __CMPH_CZECH_STRUCTS_H__
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#include "hash_state.h"
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struct __czech_data_t
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{
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cmph_uint32 m; //edges (words) count
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cmph_uint32 n; //vertex count
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cmph_uint32 *g;
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hash_state_t **hashes;
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};
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struct __czech_config_data_t
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{
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CMPH_HASH hashfuncs[2];
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cmph_uint32 m; //edges (words) count
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cmph_uint32 n; //vertex count
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graph_t *graph;
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cmph_uint32 *g;
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hash_state_t **hashes;
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};
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#endif
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