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Diffstat (limited to 'src/lib/hashtable.c')
| -rw-r--r-- | src/lib/hashtable.c | 221 |
1 files changed, 0 insertions, 221 deletions
diff --git a/src/lib/hashtable.c b/src/lib/hashtable.c deleted file mode 100644 index ffff1d73..00000000 --- a/src/lib/hashtable.c +++ /dev/null @@ -1,221 +0,0 @@ -/* - * Ouroboros - Copyright (C) 2016 - 2020 - * - * Hash table with separate chaining on collisions - * - * Dimitri Staessens <dimitri.staessens@ugent.be> - * Sander Vrijders <sander.vrijders@ugent.be> - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public License - * version 2.1 as published by the Free Software Foundation. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with this library; if not, write to the Free Software - * Foundation, Inc., http://www.fsf.org/about/contact/. - */ - -#if defined(__linux__) || defined(__CYGWIN__) -#define _DEFAULT_SOURCE -#endif - -#include <ouroboros/hashtable.h> -#include <ouroboros/list.h> -#include <ouroboros/errno.h> -#include <ouroboros/hash.h> - -#include <assert.h> -#include <string.h> - -struct htable_entry { - struct list_head next; - uint64_t key; - void * val; - size_t len; -}; - -struct htable { - struct list_head * buckets; - bool hash_key; - uint64_t buckets_size; -}; - -struct htable * htable_create(uint64_t buckets, - bool hash_key) -{ - struct htable * tmp; - unsigned int i; - - if (buckets == 0) - return NULL; - - buckets--; - buckets |= buckets >> 1; - buckets |= buckets >> 2; - buckets |= buckets >> 4; - buckets |= buckets >> 8; - buckets |= buckets >> 16; - buckets |= buckets >> 32; - buckets++; - - tmp = malloc(sizeof(*tmp)); - if (tmp == NULL) - return NULL; - - tmp->hash_key = hash_key; - tmp->buckets_size = buckets; - - tmp->buckets = malloc(buckets * sizeof(*tmp->buckets)); - if (tmp->buckets == NULL) { - free(tmp); - return NULL; - } - - for (i = 0; i < buckets; i++) - list_head_init(&(tmp->buckets[i])); - - return tmp; -} - -void htable_destroy(struct htable * table) -{ - assert(table); - assert(table->buckets); - - htable_flush(table); - free(table->buckets); - free(table); -} - -void htable_flush(struct htable * table) -{ - unsigned int i; - struct list_head * pos = NULL; - struct list_head * n = NULL; - struct htable_entry * entry; - - assert(table); - - for (i = 0; i < table->buckets_size; i++) { - list_for_each_safe(pos, n, &(table->buckets[i])) { - entry = list_entry(pos, struct htable_entry, next); - list_del(&entry->next); - free(entry->val); - free(entry); - } - } -} - -static uint64_t hash(uint64_t key) -{ - void * res; - uint64_t ret; - uint8_t keys[4]; - - memcpy(keys, &key, 4); - - mem_hash(HASH_MD5, &res, keys, 4); - - ret = (* (uint64_t *) res); - - free(res); - - return ret; -} - -static uint64_t calc_key(struct htable * table, - uint64_t key) -{ - if (table->hash_key) - key = hash(key); - - return (key & (table->buckets_size - 1)); -} - -int htable_insert(struct htable * table, - uint64_t key, - void * val, - size_t len) -{ - struct htable_entry * entry; - uint64_t lookup_key; - struct list_head * pos = NULL; - - assert(table); - - lookup_key = calc_key(table, key); - - list_for_each(pos, &(table->buckets[lookup_key])) { - entry = list_entry(pos, struct htable_entry, next); - if (entry->key == key) - return -1; - } - - entry = malloc(sizeof(*entry)); - if (entry == NULL) - return -ENOMEM; - - entry->key = key; - entry->val = val; - entry->len = len; - list_head_init(&entry->next); - - list_add(&entry->next, &(table->buckets[lookup_key])); - - return 0; -} - -int htable_lookup(struct htable * table, - uint64_t key, - void ** val, - size_t * len) -{ - struct htable_entry * entry; - struct list_head * pos = NULL; - uint64_t lookup_key; - - assert(table); - - lookup_key = calc_key(table, key); - - list_for_each(pos, &(table->buckets[lookup_key])) { - entry = list_entry(pos, struct htable_entry, next); - if (entry->key == key) { - *val = entry->val; - *len = entry->len; - return 0; - } - } - - return -1; -} - -int htable_delete(struct htable * table, - uint64_t key) -{ - struct htable_entry * entry; - uint64_t lookup_key; - struct list_head * pos = NULL; - struct list_head * n = NULL; - - assert(table); - - lookup_key = calc_key(table, key); - - list_for_each_safe(pos, n, &(table->buckets[lookup_key])) { - entry = list_entry(pos, struct htable_entry, next); - if (entry->key == key) { - list_del(&entry->next); - free(entry->val); - free(entry); - return 0; - } - } - - return -1; -} |