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#include "hmap.h"
#include "slice.h"
#include <inttypes.h>
#include <string.h>
#include <stdlib.h>
#include <err.h>
#if SIZE_MAX == 0xFFFFFFFF
/* If size_t is 32bit */
static const size_t fnv_prime = 16777619u;
static const size_t fnv_offsetb = 2166136261u;
#elif SIZE_MAX == 0xFFFFFFFFFFFFFFFF
/* If size_t is 64bit */
static const size_t fnv_prime = 1099511628211u;
static const size_t fnv_offsetb = 14695981039346656037u;
#else
/* If size_t is 128bit. Maybe this is overdoing it? */
static const size_t fnv_prime = 309485009821345068724781371u;
static const size_t fnv_offsetb = 144066263297769815596495629667062367629u;
#endif
struct hnode {
struct slice key;
void *value;
struct hnode *next;
};
/* FNV1a */
static size_t
hash(const char *str)
{
size_t hash = fnv_offsetb;
size_t i = 0;
while (str[i] != '\0') {
hash ^= str[i];
hash *= fnv_prime;
i++;
}
return hash;
}
static size_t
hash_slice(const struct slice *slice)
{
size_t hash = fnv_offsetb;
size_t i = slice->start;
while (i < slice->end) {
hash ^= slice->str[i];
hash *= fnv_prime;
i++;
}
return hash;
}
struct hmap *
hmap_new_with_cap(size_t cap)
{
struct hmap *hm = malloc(sizeof *hm);
hm->cap = cap;
hm->size = 0;
if (hm == NULL) return NULL;
hm->buckets = calloc(cap, sizeof hm->buckets);
if (hm->buckets == NULL) {
free(hm);
return NULL;
}
return hm;
}
void *
hmap_sets(struct hmap *hm, struct slice key, void *value)
{
int pos = hash_slice(&key) % hm->cap;
struct hnode *head = hm->buckets[pos];
struct hnode *node = head;
void *old_value = NULL;
while (node) {
if (slice_cmp(&node->key, &key) == 0) {
old_value = node->value;
node->value = value;
return old_value;
}
node = node->next;
}
node = malloc(sizeof *node);
node->key = key;
node->value = value;
node->next = head;
hm->buckets[pos] = node;
hm->size++;
return old_value;
}
void *
hmap_set(struct hmap *hm, const char *k, void *value)
{
struct slice key = slice_fullstr(k);
return hmap_sets(hm, key, value);
}
void *
hmap_gets(struct hmap *hm, const struct slice *key)
{
size_t pos = hash_slice(key) % hm->cap;
struct hnode *node = hm->buckets[pos];
while (node != NULL) {
if (slice_cmp(&node->key, key) == 0) {
return node->value;
}
node = node->next;
}
return NULL;
}
void *
hmap_get(struct hmap *hm, const char *k)
{
struct slice key = slice_fullstr(k);
return hmap_gets(hm, &key);
}
void *
hmap_resolve(struct hmap *hm, const char *key)
{
char tmp_key[64];
int i = 0;
int j = 0;
while (1) {
for (j=0; key[i] != '.' && key[i] != '\0'; i++, j++) {
tmp_key[j] = key[i];
}
tmp_key[j] = '\0';
hm = hmap_get(hm, tmp_key);
// stop if we read key to end of string
if (key[i] == '\0') {
break;
}
// otherwise, continue reading keys
i++;
}
return hm;
}
void *
hmap_removes(struct hmap *hm, const struct slice *key)
{
int pos = hash_slice(key) % hm->cap;
struct hnode *node = hm->buckets[pos];
struct hnode *prev = NULL;
void *old_value;
while (node) {
if (slice_cmp(&node->key, key) == 0) {
if (prev) {
prev->next = node->next;
} else {
hm->buckets[pos] = node->next;
}
old_value = node->value;
free(node);
hm->size--;
return old_value;
}
prev = node;
node = node->next;
}
return NULL;
}
void *
hmap_remove(struct hmap *hm, const char *k)
{
struct slice key = slice_fullstr(k);
return hmap_removes(hm, &key);
}
#define HMAP_WALK(hm, ...) \
struct hnode *node; \
struct hnode *next; \
for (size_t i = 0; i < hm->cap; i++) { \
node = hm->buckets[i]; \
while (node) { \
next = node->next; \
__VA_ARGS__; \
node = next; \
} \
}
void
hmap_walk(struct hmap *hm, hmap_cb cb)
{
HMAP_WALK(hm, cb(&node->key, node->value));
}
void
hmap_destroy(struct hmap *hm, hmap_cb cb)
{
HMAP_WALK(hm, cb(&node->key, node->value), free(node));
free(hm->buckets);
free(hm);
}
void
hmap_free(struct hmap *hm)
{
HMAP_WALK(hm, free(node));
free(hm->buckets);
free(hm);
}
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