cmph_uint32 chd_ph_search(cmph_t *mphf, const char *key, cmph_uint32 keylen)
{
register chd_ph_data_t * chd_ph = mphf->data;
cmph_uint32 hl[3];
register cmph_uint32 disp,position;
register cmph_uint32 probe0_num,probe1_num;
register cmph_uint32 f,g,h;
hash_vector(chd_ph->hl, key, keylen, hl);
g = hl[0] % chd_ph->nbuckets;
f = hl[1] % chd_ph->n;
h = hl[2] % (chd_ph->n-1) + 1;
disp = compressed_seq_query(chd_ph->cs, g);
probe0_num = disp % chd_ph->n;
probe1_num = disp/chd_ph->n;
position = (cmph_uint32)((f + ((cmph_uint64 )h)*probe0_num + probe1_num) % chd_ph->n);
return position;
}
static cmph_uint32 brz_fch_search(brz_data_t *brz, const char *key, cmph_uint32 keylen, cmph_uint32 * fingerprint)
{
register cmph_uint32 h0;
hash_vector(brz->h0, key, keylen, fingerprint);
h0 = fingerprint[2] % brz->k;
register cmph_uint32 m = brz->size[h0];
register cmph_uint32 b = fch_calc_b(brz->c, m);
register double p1 = fch_calc_p1(m);
register double p2 = fch_calc_p2(b);
register cmph_uint32 h1 = hash(brz->h1[h0], key, keylen) % m;
register cmph_uint32 h2 = hash(brz->h2[h0], key, keylen) % m;
register cmph_uint8 mphf_bucket = 0;
h1 = mixh10h11h12(b, p1, p2, h1);
mphf_bucket = (cmph_uint8)((h2 + brz->g[h0][h1]) % m);
return (mphf_bucket + brz->offset[h0]);
}
static cmph_uint32 brz_bmz8_search(brz_data_t *brz, const char *key, cmph_uint32 keylen, cmph_uint32 * fingerprint)
{
register cmph_uint32 h0;
hash_vector(brz->h0, key, keylen, fingerprint);
h0 = fingerprint[2] % brz->k;
register cmph_uint32 m = brz->size[h0];
register cmph_uint32 n = (cmph_uint32)ceil(brz->c * m);
register cmph_uint32 h1 = hash(brz->h1[h0], key, keylen) % n;
register cmph_uint32 h2 = hash(brz->h2[h0], key, keylen) % n;
register cmph_uint8 mphf_bucket;
if (h1 == h2 && ++h2 >= n) h2 = 0;
mphf_bucket = (cmph_uint8)(brz->g[h0][h1] + brz->g[h0][h2]);
DEBUGP("key: %s h1: %u h2: %u h0: %u\n", key, h1, h2, h0);
DEBUGP("key: %s g[h1]: %u g[h2]: %u offset[h0]: %u edges: %u\n", key, brz->g[h0][h1], brz->g[h0][h2], brz->offset[h0], brz->m);
DEBUGP("Address: %u\n", mphf_bucket + brz->offset[h0]);
return (mphf_bucket + brz->offset[h0]);
}
static int bdz_mapping(cmph_config_t *mph, bdz_graph3_t* graph3, bdz_queue_t queue)
{
cmph_uint32 e;
int cycles = 0;
cmph_uint32 hl[3];
bdz_config_data_t *bdz = (bdz_config_data_t *)mph->data;
bdz_init_graph3(graph3, bdz->m, bdz->n);
mph->key_source->rewind(mph->key_source->data);
for (e = 0; e < mph->key_source->nkeys; ++e)
{
cmph_uint32 h0, h1, h2;
cmph_uint32 keylen;
char *key = NULL;
mph->key_source->read(mph->key_source->data, &key, &keylen);
hash_vector(bdz->hl, key, keylen,hl);
h0 = hl[0] % bdz->r;
h1 = hl[1] % bdz->r + bdz->r;
h2 = hl[2] % bdz->r + (bdz->r << 1);
mph->key_source->dispose(mph->key_source->data, key, keylen);
bdz_add_edge(graph3,h0,h1,h2);
}
cycles = bdz_generate_queue(bdz->m, bdz->n, queue, graph3);
return (cycles == 0);
}
cmph_uint8 chd_ph_mapping(cmph_config_t *mph, chd_ph_bucket_t * buckets, chd_ph_item_t * items, cmph_uint32 *max_bucket_size)
{
register cmph_uint32 i = 0, g = 0;
cmph_uint32 hl[3];
chd_ph_config_data_t *chd_ph = (chd_ph_config_data_t *)mph->data;
char * key = NULL;
cmph_uint32 keylen = 0;
chd_ph_map_item_t * map_item;
chd_ph_map_item_t * map_items = malloc(chd_ph->m*sizeof(chd_ph_map_item_t));
register cmph_uint32 mapping_iterations = 1000;
*max_bucket_size = 0;
while(1)
{
mapping_iterations--;
if (chd_ph->hl) hash_state_destroy(chd_ph->hl);
chd_ph->hl = hash_state_new(chd_ph->hashfunc, chd_ph->m);
chd_ph_bucket_clean(buckets, chd_ph->nbuckets);
mph->key_source->rewind(mph->key_source->data);
for(i = 0; i < chd_ph->m; i++)
{
mph->key_source->read(mph->key_source->data, &key, &keylen);
hash_vector(chd_ph->hl, key, keylen, hl);
map_item = (map_items + i);
g = hl[0] % chd_ph->nbuckets;
map_item->f = hl[1] % chd_ph->n;
map_item->h = hl[2] % (chd_ph->n - 1) + 1;
map_item->bucket_num=g;
mph->key_source->dispose(mph->key_source->data, key, keylen);
// if(buckets[g].size == (chd_ph->keys_per_bucket << 2))
// {
// DEBUGP("BUCKET = %u -- SIZE = %u -- MAXIMUM SIZE = %u\n", g, buckets[g].size, (chd_ph->keys_per_bucket << 2));
// goto error;
// }
buckets[g].size++;
if(buckets[g].size > *max_bucket_size)
{
*max_bucket_size = buckets[g].size;
}
}
buckets[0].items_list = 0;
for(i = 1; i < chd_ph->nbuckets; i++)
{
buckets[i].items_list = buckets[i-1].items_list + buckets[i - 1].size;
buckets[i - 1].size = 0;
};
buckets[i - 1].size = 0;
for(i = 0; i < chd_ph->m; i++)
{
map_item = (map_items + i);
if(!chd_ph_bucket_insert(buckets, map_items, items, chd_ph->nbuckets, i))
break;
}
if(i == chd_ph->m)
{
free(map_items);
return 1; // SUCCESS
}
if(mapping_iterations == 0)
{
goto error;
}
}
error:
free(map_items);
hash_state_destroy(chd_ph->hl);
chd_ph->hl = NULL;
return 0; // FAILURE
}
