mirror of
https://github.com/JamesonHuang/OpenWrt_Luci_Lua.git
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182 lines
6.3 KiB
C
182 lines
6.3 KiB
C
/* Hash Tables Implementation.
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*
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* This file implements in-memory hash tables with insert/del/replace/find/
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* get-random-element operations. Hash tables will auto-resize if needed
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* tables of power of two in size are used, collisions are handled by
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* chaining. See the source code for more information... :)
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*
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* Copyright (c) 2006-2012, Salvatore Sanfilippo <antirez at gmail dot com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Redis nor the names of its contributors may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdint.h>
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#ifndef __DICT_H
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#define __DICT_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define DICT_OK 0
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#define DICT_ERR 1
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/* Unused arguments generate annoying warnings... */
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#define DICT_NOTUSED(V) ((void) V)
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typedef struct dictEntry {
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void *key;
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union {
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void *val;
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uint64_t u64;
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int64_t s64;
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} v;
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struct dictEntry *next;
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} dictEntry;
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typedef struct dictType {
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unsigned int (*hashFunction)(const void *key);
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void *(*keyDup)(void *privdata, const void *key);
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void *(*valDup)(void *privdata, const void *obj);
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int (*keyCompare)(void *privdata, const void *key1, const void *key2);
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void (*keyDestructor)(void *privdata, void *key);
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void (*valDestructor)(void *privdata, void *obj);
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} dictType;
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/* This is our hash table structure. Every dictionary has two of this as we
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* implement incremental rehashing, for the old to the new table. */
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typedef struct dictht {
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dictEntry **table;
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unsigned long size;
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unsigned long sizemask;
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unsigned long used;
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} dictht;
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typedef struct dict {
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dictType *type;
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void *privdata;
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dictht ht[2];
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int rehashidx; /* rehashing not in progress if rehashidx == -1 */
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int iterators; /* number of iterators currently running */
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} dict;
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/* If safe is set to 1 this is a safe iterator, that means, you can call
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* dictAdd, dictFind, and other functions against the dictionary even while
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* iterating. Otherwise it is a non safe iterator, and only dictNext()
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* should be called while iterating. */
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typedef struct dictIterator {
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dict *d;
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int table, index, safe;
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dictEntry *entry, *nextEntry;
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} dictIterator;
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/* This is the initial size of every hash table */
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#define DICT_HT_INITIAL_SIZE 4
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/* ------------------------------- Macros ------------------------------------*/
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#define dictFreeVal(d, entry) \
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if ((d)->type->valDestructor) \
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(d)->type->valDestructor((d)->privdata, (entry)->v.val)
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#define dictSetVal(d, entry, _val_) do { \
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if ((d)->type->valDup) \
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entry->v.val = (d)->type->valDup((d)->privdata, _val_); \
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else \
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entry->v.val = (_val_); \
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} while(0)
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#define dictSetSignedIntegerVal(entry, _val_) \
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do { entry->v.s64 = _val_; } while(0)
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#define dictSetUnsignedIntegerVal(entry, _val_) \
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do { entry->v.u64 = _val_; } while(0)
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#define dictFreeKey(d, entry) \
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if ((d)->type->keyDestructor) \
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(d)->type->keyDestructor((d)->privdata, (entry)->key)
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#define dictSetKey(d, entry, _key_) do { \
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if ((d)->type->keyDup) \
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entry->key = (d)->type->keyDup((d)->privdata, _key_); \
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else \
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entry->key = (_key_); \
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} while(0)
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#define dictCompareKeys(d, key1, key2) \
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(((d)->type->keyCompare) ? \
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(d)->type->keyCompare((d)->privdata, key1, key2) : \
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(key1) == (key2))
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#define dictHashKey(d, key) (d)->type->hashFunction(key)
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#define dictGetKey(he) ((he)->key)
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#define dictGetVal(he) ((he)->v.val)
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#define dictGetSignedIntegerVal(he) ((he)->v.s64)
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#define dictGetUnsignedIntegerVal(he) ((he)->v.u64)
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#define dictSlots(d) ((d)->ht[0].size+(d)->ht[1].size)
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#define dictSize(d) ((d)->ht[0].used+(d)->ht[1].used)
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#define dictIsRehashing(ht) ((ht)->rehashidx != -1)
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/* API */
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dict *dictCreate(dictType *type, void *privDataPtr);
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int dictExpand(dict *d, unsigned long size);
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int dictAdd(dict *d, void *key, void *val);
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dictEntry *dictAddRaw(dict *d, void *key);
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int dictReplace(dict *d, void *key, void *val);
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dictEntry *dictReplaceRaw(dict *d, void *key);
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int dictDelete(dict *d, const void *key);
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int dictDeleteNoFree(dict *d, const void *key);
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void dictRelease(dict *d);
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dictEntry * dictFind(dict *d, const void *key);
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void *dictFetchValue(dict *d, const void *key);
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int dictResize(dict *d);
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dictIterator *dictGetIterator(dict *d);
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dictIterator *dictGetSafeIterator(dict *d);
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dictEntry *dictNext(dictIterator *iter);
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void dictReleaseIterator(dictIterator *iter);
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dictEntry *dictGetRandomKey(dict *d);
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void dictPrintStats(dict *d);
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unsigned int dictGenHashFunction(const void *key, int len);
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unsigned int dictGenCaseHashFunction(const unsigned char *buf, int len);
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void dictEmpty(dict *d);
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void dictEnableResize(void);
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void dictDisableResize(void);
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int dictRehash(dict *d, int n);
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int dictRehashMilliseconds(dict *d, int ms);
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void dictSetHashFunctionSeed(unsigned int initval);
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unsigned int dictGetHashFunctionSeed(void);
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/* Hash table types */
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extern dictType dictTypeHeapStringCopyKey;
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extern dictType dictTypeHeapStrings;
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extern dictType dictTypeHeapStringCopyKeyValue;
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#ifdef __cplusplus
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}
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#endif
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#endif /* __DICT_H */
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