// Create minimal perfect hash function from in-disk keys using BDZ algorithm
int main(int argc, char **argv)
{
//Open file with newline separated list of keys
FILE * keys_fd = fopen("keys.txt", "r");
cmph_t *hash = NULL;
if (keys_fd == NULL)
{
fprintf(stderr, "File \"keys.txt\" not found\n");
exit(1);
}
// Source of keys
cmph_io_adapter_t *source = cmph_io_nlfile_adapter(keys_fd);
cmph_config_t *config = cmph_config_new(source);
cmph_config_set_algo(config, CMPH_BDZ);
hash = cmph_new(config);
cmph_config_destroy(config);
//Find key
const char *key = "jjjjjjjjjj";
unsigned int id = cmph_search(hash, key, (cmph_uint32)strlen(key));
fprintf(stderr, "Id:%u\n", id);
//Destroy hash
cmph_destroy(hash);
cmph_io_nlfile_adapter_destroy(source);
fclose(keys_fd);
return 0;
}
int create_disk_hash(struct cmph_hash_obj *o) {
char mphfile[1024];
FILE *mph;
int count = 0;
o->keys_fd = fopen(o->keyfile, "r");
if (o->keys_fd == NULL)
{
fprintf(stderr, "File %s not found\n", o->keyfile);
return(-1);
}
if((count = convert_textfile_to_ip4_bin(o->keyfile)) > 0) {
fprintf(stderr,"binary file dumped\n");
}
o->source = cmph_io_nlfile_adapter(o->keys_fd);
o->config = cmph_config_new(o->source);
// cmph_config_set_algo(o->config, CMPH_CHM);
cmph_config_set_algo(o->config, CMPH_BDZ); // seems like a win
o->hash = cmph_new(o->config);
sprintf(mphfile,"%s.mph",o->keyfile);
mph = fopen(mphfile, "w+");
if (mph == NULL)
{
fprintf(stderr, "File %s not found\n",mphfile);
return(1);
} else {
cmph_dump(o->hash, mph);
pack_n_save(o,"backup.mph");
fclose(mph);
}
cmph_config_destroy(o->config);
return (0);
}
int main(int argc, char **argv)
{
char verbosity = 0;
char *mphf_file = NULL;
const char *keys_file = NULL;
FILE *mphf_fd = stdout;
FILE *keys_fd;
cmph_uint32 nkeys = UINT_MAX;
cmph_uint32 i = 0;
cmph_t *mphf = NULL;
cmph_io_adapter_t *source;
while (1)
{
char ch = (char)getopt(argc, argv, "hVvk:m:");
if (ch == -1) break;
switch (ch)
{
case 'k':
{
char *endptr;
nkeys = (cmph_uint32) strtoul(optarg, &endptr, 10);
if(*endptr != 0) {
fprintf(stderr, "Invalid number of keys %s\n", optarg);
exit(1);
}
}
break;
case 'm':
mphf_file = strdup(optarg);
break;
case 'v':
++verbosity;
break;
case 'V':
printf("%s\n", VERSION);
return 0;
case 'h':
usage_long(argv[0]);
return 0;
default:
usage(argv[0]);
return 1;
}
}
if (optind != argc - 1)
{
usage(argv[0]);
return 1;
}
keys_file = argv[optind];
int ret = 0;
if (mphf_file == NULL)
{
mphf_file = (char *)malloc(strlen(keys_file) + 5);
memcpy(mphf_file, keys_file, strlen(keys_file));
memcpy(mphf_file + strlen(keys_file), ".mph\0", (size_t)5);
}
keys_fd = fopen(keys_file, "r");
if (keys_fd == NULL)
{
fprintf(stderr, "Unable to open file %s: %s\n", keys_file, strerror(errno));
return -1;
}
if(nkeys == UINT_MAX) source = cmph_io_nlfile_adapter(keys_fd);
else source = cmph_io_nlnkfile_adapter(keys_fd, nkeys);
cmph_uint8 * hashtable = NULL;
mphf_fd = fopen(mphf_file, "r");
if (mphf_fd == NULL)
{
fprintf(stderr, "Unable to open input file %s: %s\n", mphf_file, strerror(errno));
free(mphf_file);
return -1;
}
mphf = cmph_load(mphf_fd);
fclose(mphf_fd);
if (!mphf)
{
fprintf(stderr, "Unable to parser input file %s\n", mphf_file);
free(mphf_file);
return -1;
}
cmph_uint32 siz = cmph_size(mphf);
hashtable = (cmph_uint8*)malloc(siz*sizeof(cmph_uint8));
memset(hashtable, 0, (size_t)siz);
//check all keys
for (i = 0; i < source->nkeys; ++i)
{
cmph_uint32 h;
char *buf;
cmph_uint32 buflen = 0;
source->read(source->data, &buf, &buflen);
h = cmph_search(mphf, buf, buflen);
if (!(h < siz))
{
fprintf(stderr, "Unknown key %*s in the input.\n", buflen, buf);
ret = 1;
} else if(hashtable[h])
{
fprintf(stderr, "Duplicated or unknown key %*s in the input\n", buflen, buf);
ret = 1;
} else hashtable[h] = 1;
if (verbosity)
{
printf("%s -> %u\n", buf, h);
}
source->dispose(source->data, buf, buflen);
}
cmph_destroy(mphf);
free(hashtable);
fclose(keys_fd);
free(mphf_file);
cmph_io_nlfile_adapter_destroy(source);
return ret;
}
int main(int argc, char **argv)
{
cmph_uint32 verbosity = 0;
char generate = 0;
char *mphf_file = NULL;
FILE *mphf_fd = stdout;
const char *keys_file = NULL;
FILE *keys_fd;
cmph_uint32 nkeys = UINT_MAX;
cmph_uint32 seed = UINT_MAX;
CMPH_HASH *hashes = NULL;
cmph_uint32 nhashes = 0;
cmph_uint32 i;
CMPH_ALGO mph_algo = CMPH_CHM;
double c = 0;
cmph_config_t *config = NULL;
cmph_t *mphf = NULL;
char * tmp_dir = NULL;
cmph_io_adapter_t *source;
cmph_uint32 memory_availability = 0;
cmph_uint32 b = 0;
cmph_uint32 keys_per_bin = 1;
while (1)
{
char ch = (char)getopt(argc, argv, "hVvgc:k:a:M:b:t:f:m:d:s:");
if (ch == -1) break;
switch (ch)
{
case 's':
{
char *cptr;
seed = (cmph_uint32)strtoul(optarg, &cptr, 10);
if(*cptr != 0) {
fprintf(stderr, "Invalid seed %s\n", optarg);
exit(1);
}
}
break;
case 'c':
{
char *endptr;
c = strtod(optarg, &endptr);
if(*endptr != 0) {
fprintf(stderr, "Invalid c value %s\n", optarg);
exit(1);
}
}
break;
case 'g':
generate = 1;
break;
case 'k':
{
char *endptr;
nkeys = (cmph_uint32)strtoul(optarg, &endptr, 10);
if(*endptr != 0) {
fprintf(stderr, "Invalid number of keys %s\n", optarg);
exit(1);
}
}
break;
case 'm':
mphf_file = strdup(optarg);
break;
case 'd':
tmp_dir = strdup(optarg);
break;
case 'M':
{
char *cptr;
memory_availability = (cmph_uint32)strtoul(optarg, &cptr, 10);
if(*cptr != 0) {
fprintf(stderr, "Invalid memory availability %s\n", optarg);
exit(1);
}
}
break;
case 'b':
{
char *cptr;
b = (cmph_uint32)strtoul(optarg, &cptr, 10);
if(*cptr != 0) {
fprintf(stderr, "Parameter b was not found: %s\n", optarg);
exit(1);
}
}
break;
case 't':
{
char *cptr;
keys_per_bin = (cmph_uint32)strtoul(optarg, &cptr, 10);
if(*cptr != 0) {
fprintf(stderr, "Parameter t was not found: %s\n", optarg);
exit(1);
}
}
break;
case 'v':
++verbosity;
break;
case 'V':
printf("%s\n", VERSION);
return 0;
case 'h':
usage_long(argv[0]);
return 0;
case 'a':
{
char valid = 0;
for (i = 0; i < CMPH_COUNT; ++i)
{
if (strcmp(cmph_names[i], optarg) == 0)
{
mph_algo = (CMPH_ALGO)i;
valid = 1;
break;
}
}
if (!valid)
{
fprintf(stderr, "Invalid mph algorithm: %s. It is not available in version %s\n", optarg, VERSION);
return -1;
}
}
break;
case 'f':
{
char valid = 0;
for (i = 0; i < CMPH_HASH_COUNT; ++i)
{
if (strcmp(cmph_hash_names[i], optarg) == 0)
{
hashes = (CMPH_HASH *)realloc(hashes, sizeof(CMPH_HASH) * ( nhashes + 2 ));
hashes[nhashes] = (CMPH_HASH)i;
hashes[nhashes + 1] = CMPH_HASH_COUNT;
++nhashes;
valid = 1;
break;
}
}
if (!valid)
{
fprintf(stderr, "Invalid hash function: %s\n", optarg);
return -1;
}
}
break;
default:
usage(argv[0]);
return 1;
}
}
if (optind != argc - 1)
{
usage(argv[0]);
return 1;
}
keys_file = argv[optind];
if (seed == UINT_MAX) seed = (cmph_uint32)time(NULL);
srand(seed);
int ret = 0;
if (mphf_file == NULL)
{
mphf_file = (char *)malloc(strlen(keys_file) + 5);
memcpy(mphf_file, keys_file, strlen(keys_file));
memcpy(mphf_file + strlen(keys_file), ".mph\0", (size_t)5);
}
keys_fd = fopen(keys_file, "r");
if (keys_fd == NULL)
{
fprintf(stderr, "Unable to open file %s: %s\n", keys_file, strerror(errno));
return -1;
}
if (seed == UINT_MAX) seed = (cmph_uint32)time(NULL);
if(nkeys == UINT_MAX) source = cmph_io_nlfile_adapter(keys_fd);
else source = cmph_io_nlnkfile_adapter(keys_fd, nkeys);
if (generate)
{
//Create mphf
mphf_fd = fopen(mphf_file, "w");
config = cmph_config_new(source);
cmph_config_set_algo(config, mph_algo);
if (nhashes) cmph_config_set_hashfuncs(config, hashes);
cmph_config_set_verbosity(config, verbosity);
cmph_config_set_tmp_dir(config, (cmph_uint8 *) tmp_dir);
cmph_config_set_mphf_fd(config, mphf_fd);
cmph_config_set_memory_availability(config, memory_availability);
cmph_config_set_b(config, b);
cmph_config_set_keys_per_bin(config, keys_per_bin);
//if((mph_algo == CMPH_BMZ || mph_algo == CMPH_BRZ) && c >= 2.0) c=1.15;
if(mph_algo == CMPH_BMZ && c >= 2.0) c=1.15;
if (c != 0) cmph_config_set_graphsize(config, c);
mphf = cmph_new(config);
cmph_config_destroy(config);
if (mphf == NULL)
{
fprintf(stderr, "Unable to create minimum perfect hashing function\n");
//cmph_config_destroy(config);
free(mphf_file);
return -1;
}
if (mphf_fd == NULL)
{
fprintf(stderr, "Unable to open output file %s: %s\n", mphf_file, strerror(errno));
free(mphf_file);
return -1;
}
cmph_dump(mphf, mphf_fd);
cmph_destroy(mphf);
fclose(mphf_fd);
}
else
{
cmph_uint8 * hashtable = NULL;
mphf_fd = fopen(mphf_file, "r");
if (mphf_fd == NULL)
{
fprintf(stderr, "Unable to open input file %s: %s\n", mphf_file, strerror(errno));
free(mphf_file);
return -1;
}
mphf = cmph_load(mphf_fd);
fclose(mphf_fd);
if (!mphf)
{
fprintf(stderr, "Unable to parser input file %s\n", mphf_file);
free(mphf_file);
return -1;
}
cmph_uint32 siz = cmph_size(mphf);
hashtable = (cmph_uint8*)calloc(siz, sizeof(cmph_uint8));
memset(hashtable, 0,(size_t) siz);
//check all keys
for (i = 0; i < source->nkeys; ++i)
{
cmph_uint32 h;
char *buf;
cmph_uint32 buflen = 0;
source->read(source->data, &buf, &buflen);
h = cmph_search(mphf, buf, buflen);
if (!(h < siz))
{
fprintf(stderr, "Unknown key %*s in the input.\n", buflen, buf);
ret = 1;
} else if(hashtable[h] >= keys_per_bin)
{
fprintf(stderr, "More than %u keys were mapped to bin %u\n", keys_per_bin, h);
fprintf(stderr, "Duplicated or unknown key %*s in the input\n", buflen, buf);
ret = 1;
} else hashtable[h]++;
if (verbosity)
{
printf("%s -> %u\n", buf, h);
}
source->dispose(source->data, buf, buflen);
}
cmph_destroy(mphf);
free(hashtable);
}
fclose(keys_fd);
free(mphf_file);
free(tmp_dir);
cmph_io_nlfile_adapter_destroy(source);
return ret;
}