const char* hattrie_iter_key(hattrie_iter_t* i, size_t* len)
{
if (hattrie_iter_finished(i)) return NULL;
uint16_t sublen;
const char* subkey;
if (i->has_nil_key) {
subkey = NULL;
sublen = 0;
}
else subkey = hhash_iter_key(i->i, &sublen);
if (i->keysize < i->level + sublen + 1) {
while (i->keysize < i->level + sublen + 1) i->keysize *= 2;
i->key = realloc(i->key, i->keysize * sizeof(char));
}
if (sublen > 0) {
memcpy(i->key + i->level, subkey, sublen);
}
i->key[i->level + sublen] = '\0';
*len = i->level + sublen;
return i->key;
}
static void hashnode_split_reinsert(hattrie_t *T, node_ptr parent, node_ptr src)
{
value_t* u = NULL;
const char* key = NULL;
uint16_t len = 0;
hhash_iter_t i;
hhash_iter_begin(src.b, &i, false);
while (!hhash_iter_finished(&i)) {
key = hhash_iter_key(&i, &len);
u = hhash_iter_val(&i);
*find_below(T, parent, key, len) = *u;
hhash_iter_next(&i);
}
hhash_free(src.b);
}
int hattrie_split_mid(node_ptr node, unsigned *left_m, unsigned *right_m)
{
/* count the number of occourances of every leading character */
unsigned int cs[NODE_CHILDS]; // occurance count for leading chars
memset(cs, 0, NODE_CHILDS * sizeof(unsigned int));
uint16_t len;
const char* key;
/*! \todo expensive, maybe some heuristics or precalc would be better */
hhash_iter_t i;
hhash_iter_begin(node.b, &i, false);
while (!hhash_iter_finished(&i)) {
key = hhash_iter_key(&i, &len);
assert(len > 0);
cs[(unsigned char) key[0]] += 1;
hhash_iter_next(&i);
}
/* choose a split point */
unsigned int all_m;
unsigned char j = node.b->c0;
all_m = node.b->weight;
*left_m = cs[j];
*right_m = all_m - *left_m;
int d;
while (j + 1 < node.b->c1) {
d = abs((int) (*left_m + cs[j + 1]) - (int) (*right_m - cs[j + 1]));
if (d <= abs((int) (*left_m) - (int) (*right_m)) && *left_m + cs[j + 1] < all_m) {
j += 1;
*left_m += cs[j];
*right_m -= cs[j];
}
else break;
}
return j;
}
int main(int argc, char *argv[])
{
plan(11);
/* Create memory pool context. */
struct mempool *pool = mp_new(64 * 1024);
knot_mm_t mm;
mm.ctx = pool;
mm.alloc = (knot_mm_alloc_t)mp_alloc;
mm.free = NULL;
/* Create hashtable */
int ret = KNOT_EOK;
uint16_t len = 0;
const char *key = "mykey", *cur = NULL, *prev = NULL;
value_t val = (void*)0xdeadbeef, *rval = NULL;
hhash_iter_t it;
hhash_t *tbl = hhash_create_mm(ELEM_COUNT, &mm);
ok(tbl != NULL, "hhash: create");
if (tbl == NULL) {
return KNOT_ERROR; /* No point in testing further on. */
}
/* Generate random keys. */
char *keys[ELEM_COUNT];
unsigned nfilled = 0;
for (unsigned i = 0; i < ELEM_COUNT; ++i) {
keys[i] = test_randstr_mm(&mm);
}
/* Insert single element. */
ret = hhash_insert(tbl, key, KEY_LEN(key), val);
ok(ret == KNOT_EOK, "hhash: insert single element");
/* Retrieve nonexistent element. */
cur = "nokey";
rval = hhash_find(tbl, cur, KEY_LEN(cur));
ok(rval == NULL, "hhash: find non-existent element");
/* Retrieve single element. */
rval = hhash_find(tbl, key, KEY_LEN(key));
ok(rval != NULL, "hhash: find existing element");
/* Fill the table. */
for (unsigned i = 0; i < ELEM_COUNT; ++i) {
ret = hhash_insert(tbl, keys[i], KEY_LEN(keys[i]), keys[i]);
if (ret != KNOT_EOK) {
nfilled = i;
break;
}
}
/* Check all keys integrity. */
unsigned nfound = 0;
for (unsigned i = 0; i < nfilled; ++i) {
rval = hhash_find(tbl, keys[i], KEY_LEN(keys[i]));
if (!rval || memcmp(*rval, keys[i], KEY_LEN(keys[i])) != 0) {
break; /* Mismatch */
}
++nfound;
}
is_int(nfilled, nfound, "hhash: found all inserted keys");
/* Test keys order index. */
hhash_build_index(tbl);
hhash_iter_begin(tbl, &it, true);
while (!hhash_iter_finished(&it)) {
cur = hhash_iter_key(&it, &len);
if (!str_check_sort(prev, cur)) {
break;
}
prev = cur;
int strl = strlen(cur);
assert(strl + 1 == len);
hhash_iter_next(&it);
}
ok(hhash_iter_finished(&it), "hhash: passed order index checks");
/* Retrieve all keys. */
nfound = 0;
hhash_iter_begin(tbl, &it, false);
while (!hhash_iter_finished(&it)) {
cur = hhash_iter_key(&it, &len);
if (hhash_find(tbl, cur, len) == NULL) {
break;
} else {
++nfound;
}
hhash_iter_next(&it);
}
ok(hhash_iter_finished(&it), "hhash: found all iterated keys");
is_int(tbl->weight, nfound, "hhash: all iterated keys found");
/* Test find less or equal. */
prev = "mykey0"; /* mykey should precede it */
hhash_find_leq(tbl, prev, KEY_LEN(prev), &rval);
ok(rval && *rval == val, "hhash: find less or equal");
/* Delete key and retrieve it. */
ret = hhash_del(tbl, key, KEY_LEN(key));
ok(ret == KNOT_EOK, "hhash: remove key");
rval = hhash_find(tbl, key, KEY_LEN(key));
ok(rval == NULL, "hhash: find removed element");
/* Free all memory. */
mp_delete(mm.ctx);
return KNOT_EOK;
}