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/*
* ngtcp2
*
* Copyright (c) 2017 ngtcp2 contributors
* Copyright (c) 2012 nghttp2 contributors
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "ngtcp2_map.h"
#include <string.h>
#include "ngtcp2_conv.h"
#define INITIAL_TABLE_LENGTH 256
int ngtcp2_map_init(ngtcp2_map *map, const ngtcp2_mem *mem) {
map->mem = mem;
map->tablelen = INITIAL_TABLE_LENGTH;
map->table =
ngtcp2_mem_calloc(mem, map->tablelen, sizeof(ngtcp2_map_entry *));
if (map->table == NULL) {
return NGTCP2_ERR_NOMEM;
}
map->size = 0;
return 0;
}
void ngtcp2_map_free(ngtcp2_map *map) { ngtcp2_mem_free(map->mem, map->table); }
void ngtcp2_map_each_free(ngtcp2_map *map,
int (*func)(ngtcp2_map_entry *entry, void *ptr),
void *ptr) {
uint32_t i;
for (i = 0; i < map->tablelen; ++i) {
ngtcp2_map_entry *entry;
for (entry = map->table[i]; entry;) {
ngtcp2_map_entry *next = entry->next;
func(entry, ptr);
entry = next;
}
map->table[i] = NULL;
}
}
int ngtcp2_map_each(ngtcp2_map *map,
int (*func)(ngtcp2_map_entry *entry, void *ptr),
void *ptr) {
int rv;
uint32_t i;
for (i = 0; i < map->tablelen; ++i) {
ngtcp2_map_entry *entry, *next;
for (entry = map->table[i]; entry;) {
next = entry->next;
rv = func(entry, ptr);
if (rv != 0) {
return rv;
}
entry = next;
}
}
return 0;
}
void ngtcp2_map_entry_init(ngtcp2_map_entry *entry, key_type key) {
entry->key = key;
entry->next = NULL;
}
/* FNV1a hash */
static uint32_t hash(key_type key, uint32_t mod) {
uint8_t *p, *end;
uint32_t h = 0x811C9DC5u;
key = ngtcp2_htonl64(key);
p = (uint8_t *)&key;
end = p + sizeof(key_type);
for (; p != end; ++p) {
h ^= *p;
h *= 0x01000193u;
}
return h & (mod - 1);
}
static int insert(ngtcp2_map_entry **table, uint32_t tablelen,
ngtcp2_map_entry *entry) {
uint32_t h = hash(entry->key, tablelen);
if (table[h] == NULL) {
table[h] = entry;
} else {
ngtcp2_map_entry *p;
/* We won't allow duplicated key, so check it out. */
for (p = table[h]; p; p = p->next) {
if (p->key == entry->key) {
return NGTCP2_ERR_INVALID_ARGUMENT;
}
}
entry->next = table[h];
table[h] = entry;
}
return 0;
}
/* new_tablelen must be power of 2 */
static int resize(ngtcp2_map *map, uint32_t new_tablelen) {
uint32_t i;
ngtcp2_map_entry **new_table;
new_table =
ngtcp2_mem_calloc(map->mem, new_tablelen, sizeof(ngtcp2_map_entry *));
if (new_table == NULL) {
return NGTCP2_ERR_NOMEM;
}
for (i = 0; i < map->tablelen; ++i) {
ngtcp2_map_entry *entry;
for (entry = map->table[i]; entry;) {
ngtcp2_map_entry *next = entry->next;
entry->next = NULL;
/* This function must succeed */
insert(new_table, new_tablelen, entry);
entry = next;
}
}
ngtcp2_mem_free(map->mem, map->table);
map->tablelen = new_tablelen;
map->table = new_table;
return 0;
}
int ngtcp2_map_insert(ngtcp2_map *map, ngtcp2_map_entry *new_entry) {
int rv;
/* Load factor is 0.75 */
if ((map->size + 1) * 4 > map->tablelen * 3) {
rv = resize(map, map->tablelen * 2);
if (rv != 0) {
return rv;
}
}
rv = insert(map->table, map->tablelen, new_entry);
if (rv != 0) {
return rv;
}
++map->size;
return 0;
}
ngtcp2_map_entry *ngtcp2_map_find(ngtcp2_map *map, key_type key) {
uint32_t h;
ngtcp2_map_entry *entry;
h = hash(key, map->tablelen);
for (entry = map->table[h]; entry; entry = entry->next) {
if (entry->key == key) {
return entry;
}
}
return NULL;
}
int ngtcp2_map_remove(ngtcp2_map *map, key_type key) {
uint32_t h;
ngtcp2_map_entry **dst;
h = hash(key, map->tablelen);
for (dst = &map->table[h]; *dst; dst = &(*dst)->next) {
if ((*dst)->key != key) {
continue;
}
*dst = (*dst)->next;
--map->size;
return 0;
}
return NGTCP2_ERR_INVALID_ARGUMENT;
}
void ngtcp2_map_clear(ngtcp2_map *map) {
uint32_t i;
for (i = 0; i < map->tablelen; ++i) {
map->table[i] = NULL;
}
map->size = 0;
}
size_t ngtcp2_map_size(ngtcp2_map *map) { return map->size; }
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