Fix to alternate hash functions code. Removed htonl stuff from chm algorithm. Added faq.
This commit is contained in:
davi
parent
9eadc88397
commit
1825613fd1
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@ -0,0 +1,27 @@
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CMPH FAQ
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- How do I define the ids of the keys?
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- You don't. The ids will be assigned by the algorithm creating the minimal
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perfect hash function. If the algorithm creates an **ordered** minimal
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perfect hash function, the ids will be the indices of the keys in the
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input. Otherwise, you have no guarantee of the distribution of the ids.
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- Why I always get the error "Unable to create minimum perfect hashing function"?
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- The algorithms do not guarantee that a minimal perfect hash function can
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be created. In practice, it will always work if your input
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is big enough (>100 keys).
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The error is probably because you have duplicated
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keys in the input. You must guarantee that the keys are unique in the
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input. If you are using a UN*X based OS, try doing
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``` #sort input.txt | uniq > input_uniq.txt
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and run cmph with input_uniq.txt
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----------------------------------------
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[Home index.html]
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----------------------------------------
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Davi de Castro Reis
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Fabiano Cupertino Botelho
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10
README
10
README
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@ -146,6 +146,10 @@ utility.
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keysfile line separated file with keys
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Additional Documentation
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FAQ (faq.html)
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Downloads
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Use the project page at sourceforge: http://sf.net/projects/cmph
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@ -158,11 +162,11 @@ Code is under the LGPL.
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Enjoy!
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Davi de Castro Reis
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Davi de Castro Reis <davi (a) users sourceforge net>
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Fabiano Cupertino Botelho
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Fabiano Cupertino Botelho <fc_botelho (a) users sourceforge net>
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Last Updated: Wed Jan 26 22:37:36 2005
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Last Updated: Thu Jan 27 10:54:36 2005
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@ -159,6 +159,10 @@ utility.
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keysfile line separated file with keys
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```
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**Additional Documentation**
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[FAQ faq.html]
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**Downloads**
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Use the project page at sourceforge: http://sf.net/projects/cmph
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@ -171,9 +175,9 @@ Code is under the LGPL.
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Enjoy!
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Davi de Castro Reis
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Davi de Castro Reis davi@users.sourceforge.net
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Fabiano Cupertino Botelho
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Fabiano Cupertino Botelho fc_botelho@users.sourceforge.net
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%!include(html): ''LOGO.html''
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Last Updated: %%date(%c)
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11
gendocs
11
gendocs
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@ -1,6 +1,13 @@
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txt2tags -t html -i README.t2t -o index.html
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txt2tags -t html --mask-email -i README.t2t -o index.html
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txt2tags -t html -i BMZ.t2t -o bmz.html
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txt2tags -t html -i CHM.t2t -o chm.html
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txt2tags -t html -i COMPARISON.t2t -o comparison.html
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txt2tags -t html -i GPERF.t2t -o gperf.html
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txt2tags -t txt -i README.t2t -o README
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txt2tags -t html -i FAQ.t2t -o faq.html
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txt2tags -t txt --mask-email -i README.t2t -o README
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txt2tags -t txt -i BMZ.t2t -o BMZ
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txt2tags -t txt -i CHM.t2t -o CHM
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txt2tags -t txt -i COMPARISON.t2t -o COMPARISON
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txt2tags -t txt -i GPERF.t2t -o GPERF
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txt2tags -t txt -i FAQ.t2t -o FAQ
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@ -27,7 +27,7 @@ static cmph_uint8 bmz_traverse_critical_nodes(bmz_config_data_t *bmz, cmph_uint3
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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(cmph_io_adapter_t *key_source)
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bmz_config_data_t *bmz_config_new()
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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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@ -6,7 +6,7 @@
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typedef struct __bmz_data_t bmz_data_t;
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typedef struct __bmz_config_data_t bmz_config_data_t;
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bmz_config_data_t *bmz_config_new(cmph_io_adapter_t *key_source);
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bmz_config_data_t *bmz_config_new();
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void bmz_config_set_hashfuncs(cmph_config_t *mph, CMPH_HASH *hashfuncs);
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void bmz_config_destroy(cmph_config_t *mph);
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cmph_t *bmz_new(cmph_config_t *mph, float c);
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38
src/chm.c
38
src/chm.c
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@ -10,20 +10,14 @@
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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 chm_gen_edges(cmph_config_t *mph);
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static void chm_traverse(chm_config_data_t *chm, cmph_uint8 *visited, cmph_uint32 v);
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chm_config_data_t *chm_config_new(cmph_io_adapter_t *key_source)
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chm_config_data_t *chm_config_new()
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{
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chm_config_data_t *chm = NULL;
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chm = (chm_config_data_t *)malloc(sizeof(chm_config_data_t));
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@ -173,7 +167,7 @@ static int chm_gen_edges(cmph_config_t *mph)
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chm_config_data_t *chm = (chm_config_data_t *)mph->data;
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int cycles = 0;
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DEBUGP("Generating edges for %u vertices\n", chm->n);
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DEBUGP("Generating edges for %u vertices with hash functions %s and %s\n", chm->n, cmph_hash_names[chm->hashfuncs[0]], cmph_hash_names[chm->hashfuncs[1]]);
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graph_clear_edges(chm->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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@ -206,39 +200,28 @@ int chm_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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cmph_uint32 two = 2; //number of hash functions
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chm_data_t *data = (chm_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(&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->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(&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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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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fwrite(&(data->n), sizeof(cmph_uint32), 1, fd);
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fwrite(&(data->m), 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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fwrite(data->g, sizeof(cmph_uint32)*data->n, 1, fd);
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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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@ -260,7 +243,6 @@ void chm_load(FILE *f, cmph_t *mphf)
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DEBUGP("Loading chm mphf\n");
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mphf->data = chm;
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fread(&nhashes, sizeof(cmph_uint32), 1, f);
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nhashes = ntohl(nhashes);
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chm->hashes = (hash_state_t **)malloc(sizeof(hash_state_t *)*(nhashes + 1));
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chm->hashes[nhashes] = NULL;
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DEBUGP("Reading %u hashes\n", nhashes);
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@ -268,7 +250,6 @@ void chm_load(FILE *f, cmph_t *mphf)
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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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@ -279,13 +260,10 @@ void chm_load(FILE *f, cmph_t *mphf)
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DEBUGP("Reading m and n\n");
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fread(&(chm->n), sizeof(cmph_uint32), 1, f);
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chm->n = ntohl(chm->n);
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fread(&(chm->m), sizeof(cmph_uint32), 1, f);
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chm->m = ntohl(chm->m);
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chm->g = (cmph_uint32 *)malloc(sizeof(cmph_uint32)*chm->n);
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fread(chm->g, chm->n*sizeof(cmph_uint32), 1, f);
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for (i = 0; i < chm->n; ++i) chm->g[i] = ntohl(chm->g[i]);
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#ifdef DEBUG
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fprintf(stderr, "G: ");
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for (i = 0; i < chm->n; ++i) fprintf(stderr, "%u ", chm->g[i]);
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@ -6,7 +6,7 @@
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typedef struct __chm_data_t chm_data_t;
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typedef struct __chm_config_data_t chm_config_data_t;
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chm_config_data_t *chm_config_new(cmph_io_adapter_t *key_source);
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chm_config_data_t *chm_config_new();
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void chm_config_set_hashfuncs(cmph_config_t *mph, CMPH_HASH *hashfuncs);
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void chm_config_destroy(cmph_config_t *mph);
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cmph_t *chm_new(cmph_config_t *mph, float c);
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28
src/cmph.c
28
src/cmph.c
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@ -98,11 +98,37 @@ cmph_config_t *cmph_config_new(cmph_io_adapter_t *key_source)
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mph = __config_new(key_source);
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assert(mph);
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mph->algo = CMPH_CHM; // default value
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mph->data = chm_config_new();
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return mph;
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}
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void cmph_config_set_algo(cmph_config_t *mph, CMPH_ALGO algo)
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{
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if (algo != mph->algo)
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{
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switch (mph->algo)
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{
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case CMPH_CHM:
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chm_config_destroy(mph->data);
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break;
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case CMPH_BMZ:
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bmz_config_destroy(mph->data);
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break;
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default:
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assert(0);
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}
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switch(algo)
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{
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case CMPH_CHM:
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mph->data = chm_config_new();
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break;
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case CMPH_BMZ:
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mph->data = bmz_config_new();
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break;
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default:
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assert(0);
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}
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}
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mph->algo = algo;
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}
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@ -159,13 +185,11 @@ cmph_t *cmph_new(cmph_config_t *mph)
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{
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case CMPH_CHM:
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DEBUGP("Creating chm hash\n");
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mph->data = chm_config_new(mph->key_source);
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if (c == 0) c = 2.09;
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mphf = chm_new(mph, c);
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break;
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case CMPH_BMZ: /* included -- Fabiano */
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DEBUGP("Creating bmz hash\n");
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mph->data = bmz_config_new(mph->key_source);
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if (c == 0) c = 1.15;
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mphf = bmz_new(mph, c);
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break;
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@ -12,6 +12,7 @@ cmph_config_t *__config_new(cmph_io_adapter_t *key_source)
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if (mph == NULL) return NULL;
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mph->key_source = key_source;
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mph->verbosity = 0;
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mph->data = NULL;
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float c = 0;
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return mph;
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}
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@ -23,9 +24,8 @@ void __config_destroy(cmph_config_t *mph)
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void __cmph_dump(cmph_t *mphf, FILE *fd)
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{
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cmph_uint32 nsize = htonl(mphf->size);
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fwrite(cmph_names[mphf->algo], (cmph_uint32)(strlen(cmph_names[mphf->algo]) + 1), 1, fd);
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fwrite(&nsize, sizeof(mphf->size), 1, fd);
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fwrite(&(mphf->size), sizeof(mphf->size), 1, fd);
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}
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cmph_t *__cmph_load(FILE *f)
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{
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@ -58,7 +58,6 @@ cmph_t *__cmph_load(FILE *f)
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mphf = (cmph_t *)malloc(sizeof(cmph_t));
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mphf->algo = algo;
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fread(&(mphf->size), sizeof(mphf->size), 1, f);
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mphf->size = ntohl(mphf->size);
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mphf->data = NULL;
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DEBUGP("Algorithm is %s and mphf is sized %u\n", cmph_names[algo], mphf->size);
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@ -14,7 +14,7 @@
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#endif
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#endif
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#ifdef WIN32
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#ifndef __GNUC__
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#ifndef __DEBUG_H__
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#define __DEBUG_H__
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#include <stdarg.h>
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@ -39,13 +39,13 @@ static void dummyprintf(const char *format, ...)
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#endif
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#ifdef DEBUG
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#ifdef WIN32
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#ifndef __GNUC__
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#define DEBUGP debugprintf
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#else
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#define DEBUGP(args...) do { fprintf(stderr, "%s:%d ", __FILE__, __LINE__); fprintf(stderr, ## args); } while(0)
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#endif
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#else
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#ifdef WIN32
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#ifndef __GNUC__
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#define DEBUGP dummyprintf
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#else
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#define DEBUGP(args...)
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#ifdef WIN32
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#include "../wingetopt.h"
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#else
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#include <getopt.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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