mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-22 14:22:23 +00:00
127 lines
4.6 KiB
C
127 lines
4.6 KiB
C
/* Hash table implementation.
|
|
*
|
|
* This file implements in memory hash tables with insert/del/replace/find/
|
|
* get-random-element operations. Hash tables will auto resize if needed
|
|
* tables of power of two in size are used, collisions are handled by
|
|
* chaining. See the source code for more information... :)
|
|
*
|
|
* Copyright (c) 2006-2010, Salvatore Sanfilippo <antirez at gmail dot com>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* * Redistributions of source code must retain the above copyright notice,
|
|
* this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* * Neither the name of Redis nor the names of its contributors may be used
|
|
* to endorse or promote products derived from this software without
|
|
* specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef __DICT_H
|
|
#define __DICT_H
|
|
|
|
#define DICT_OK 0
|
|
#define DICT_ERR 1
|
|
|
|
/* Unused arguments generate annoying warnings... */
|
|
#define DICT_NOTUSED(V) ((void) V)
|
|
|
|
typedef struct dictEntry {
|
|
void *key;
|
|
void *val;
|
|
struct dictEntry *next;
|
|
} dictEntry;
|
|
|
|
typedef struct dictType {
|
|
unsigned int (*hashFunction)(const void *key);
|
|
void *(*keyDup)(void *privdata, const void *key);
|
|
void *(*valDup)(void *privdata, const void *obj);
|
|
int (*keyCompare)(void *privdata, const void *key1, const void *key2);
|
|
void (*keyDestructor)(void *privdata, void *key);
|
|
void (*valDestructor)(void *privdata, void *obj);
|
|
} dictType;
|
|
|
|
typedef struct dict {
|
|
dictEntry **table;
|
|
dictType *type;
|
|
unsigned long size;
|
|
unsigned long sizemask;
|
|
unsigned long used;
|
|
void *privdata;
|
|
} dict;
|
|
|
|
typedef struct dictIterator {
|
|
dict *ht;
|
|
int index;
|
|
dictEntry *entry, *nextEntry;
|
|
} dictIterator;
|
|
|
|
/* This is the initial size of every hash table */
|
|
#define DICT_HT_INITIAL_SIZE 4
|
|
|
|
/* ------------------------------- Macros ------------------------------------*/
|
|
#define dictFreeEntryVal(ht, entry) \
|
|
if ((ht)->type->valDestructor) \
|
|
(ht)->type->valDestructor((ht)->privdata, (entry)->val)
|
|
|
|
#define dictSetHashVal(ht, entry, _val_) do { \
|
|
if ((ht)->type->valDup) \
|
|
entry->val = (ht)->type->valDup((ht)->privdata, _val_); \
|
|
else \
|
|
entry->val = (_val_); \
|
|
} while(0)
|
|
|
|
#define dictFreeEntryKey(ht, entry) \
|
|
if ((ht)->type->keyDestructor) \
|
|
(ht)->type->keyDestructor((ht)->privdata, (entry)->key)
|
|
|
|
#define dictSetHashKey(ht, entry, _key_) do { \
|
|
if ((ht)->type->keyDup) \
|
|
entry->key = (ht)->type->keyDup((ht)->privdata, _key_); \
|
|
else \
|
|
entry->key = (_key_); \
|
|
} while(0)
|
|
|
|
#define dictCompareHashKeys(ht, key1, key2) \
|
|
(((ht)->type->keyCompare) ? \
|
|
(ht)->type->keyCompare((ht)->privdata, key1, key2) : \
|
|
(key1) == (key2))
|
|
|
|
#define dictHashKey(ht, key) (ht)->type->hashFunction(key)
|
|
|
|
#define dictGetEntryKey(he) ((he)->key)
|
|
#define dictGetEntryVal(he) ((he)->val)
|
|
#define dictSlots(ht) ((ht)->size)
|
|
#define dictSize(ht) ((ht)->used)
|
|
|
|
/* API */
|
|
static unsigned int dictGenHashFunction(const unsigned char *buf, int len);
|
|
static dict *dictCreate(dictType *type, void *privDataPtr);
|
|
static int dictExpand(dict *ht, unsigned long size);
|
|
static int dictAdd(dict *ht, void *key, void *val);
|
|
static int dictReplace(dict *ht, void *key, void *val);
|
|
static int dictDelete(dict *ht, const void *key);
|
|
static void dictRelease(dict *ht);
|
|
static dictEntry * dictFind(dict *ht, const void *key);
|
|
static dictIterator *dictGetIterator(dict *ht);
|
|
static dictEntry *dictNext(dictIterator *iter);
|
|
static void dictReleaseIterator(dictIterator *iter);
|
|
|
|
#endif /* __DICT_H */
|