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/* Hash Tables 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) 2006-2012, 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.
*/
#include <stdint.h>
#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)
/* An entry (a key basically) as stored inside the hash table. Note that
* there is a 'next' pointer, since we use chaining to resolve conflicts. */
typedef struct dictEntry {
void *key;
union {
void *val;
uint64_t u64;
int64_t s64;
double d;
} v;
struct dictEntry *next;
} dictEntry;
/* The hash table type.
*
* There are two hash functions both for key hashing and comparison, one set is
* used for looking up the key and the other set to store it.
*
* Most of the times each set will be the same function pointer, but sometimes
* we want the ability to store a key in a given way inside the hash function,
* and lookup it in some other way without resorting to any kind of conversion.
* For instance the key may be stored as a structure also representing other
* things, but the lookup happens via just a pointer to a null terminated
* string. The dual hash design allows for such usage. In that case we'll have
* a lookupHashFunction that will expect a null terminated C string, and a
* storeHashFunction that will instead expect the structure.
* Similarly the two comparison functions will work differently. The
* lookupKeyCompare will treat the first argument as a pointer to a C string
* and the other as a structure (this way we can directly lookup the structure
* key using the C string). While the storedKeyCompare() will check if two
* pointers to the key in structure form are the same.
*
* Every actual hash table have a pointer to its type. */
typedef struct dictType {
uint64_t (*lookupHashFunction)(const void *key);
uint64_t (*storedHashFunction)(const void *key);
void *(*keyDup)(void *privdata, const void *key);
void *(*valDup)(void *privdata, const void *obj);
int (*lookupKeyCompare)(void *privdata, const void *key1, const void *key2);
int (*storedKeyCompare)(void *privdata, const void *key1, const void *key2);
void (*keyDestructor)(void *privdata, void *key);
void (*valDestructor)(void *privdata, void *obj);
} dictType;
/* This is our hash table structure. Every dictionary has two of this as we
* implement incremental rehashing, for the old to the new table. */
typedef struct dictht {
dictEntry **table;
unsigned long size;
unsigned long sizemask;
unsigned long used;
} dictht;
typedef struct dict {
dictType *type;
void *privdata;
dictht ht[2];
long rehashidx; /* rehashing not in progress if rehashidx == -1 */
unsigned long iterators; /* number of iterators currently running */
} dict;
/* If safe is set to 1 this is a safe iterator, that means, you can call
* dictAdd, dictFind, and other functions against the dictionary even while
* iterating. Otherwise it is a non safe iterator, and only dictNext()
* should be called while iterating. */
typedef struct dictIterator {
dict *d;
long index;
int table, safe;
dictEntry *entry, *nextEntry;
/* unsafe iterator fingerprint for misuse detection. */
long long fingerprint;
} dictIterator;
typedef void (dictScanFunction)(void *privdata, const dictEntry *de);
typedef void (dictScanBucketFunction)(void *privdata, dictEntry **bucketref);
/* This is the initial size of every hash table */
#define DICT_HT_INITIAL_SIZE 4
/* ------------------------------- Macros ------------------------------------*/
#define dictFreeVal(d, entry) \
if ((d)->type->valDestructor) \
(d)->type->valDestructor((d)->privdata, (entry)->v.val)
#define dictSetVal(d, entry, _val_) do { \
if ((d)->type->valDup) \
(entry)->v.val = (d)->type->valDup((d)->privdata, _val_); \
else \
(entry)->v.val = (_val_); \
} while(0)
#define dictSetSignedIntegerVal(entry, _val_) \
do { (entry)->v.s64 = _val_; } while(0)
#define dictSetUnsignedIntegerVal(entry, _val_) \
do { (entry)->v.u64 = _val_; } while(0)
#define dictSetDoubleVal(entry, _val_) \
do { (entry)->v.d = _val_; } while(0)
#define dictFreeKey(d, entry) \
if ((d)->type->keyDestructor) \
(d)->type->keyDestructor((d)->privdata, (entry)->key)
#define dictSetKey(d, entry, _key_) do { \
if ((d)->type->keyDup) \
(entry)->key = (d)->type->keyDup((d)->privdata, _key_); \
else \
(entry)->key = (_key_); \
} while(0)
#define dictCompareLookupKeys(d, key1, key2) \
(((d)->type->lookupKeyCompare) ? \
(d)->type->lookupKeyCompare((d)->privdata, key1, key2) : \
(key1) == (key2))
#define dictCompareStoredKeys(d, key1, key2) \
(((d)->type->storedKeyCompare) ? \
(d)->type->storedKeyCompare((d)->privdata, key1, key2) : \
(key1) == (key2))
#define dictHashLookupKey(d, key) (d)->type->lookupHashFunction(key)
#define dictHashStoredKey(d, key) (d)->type->storedHashFunction(key)
#define dictGetKey(he) ((he)->key)
#define dictGetVal(he) ((he)->v.val)
#define dictGetSignedIntegerVal(he) ((he)->v.s64)
#define dictGetUnsignedIntegerVal(he) ((he)->v.u64)
#define dictGetDoubleVal(he) ((he)->v.d)
#define dictSlots(d) ((d)->ht[0].size+(d)->ht[1].size)
#define dictSize(d) ((d)->ht[0].used+(d)->ht[1].used)
#define dictIsRehashing(d) ((d)->rehashidx != -1)
/* API */
dict *dictCreate(dictType *type, void *privDataPtr);
int dictExpand(dict *d, unsigned long size);
int dictAdd(dict *d, void *key, void *val);
dictEntry *dictAddRaw(dict *d, void *key, dictEntry **existing);
dictEntry *dictAddOrFind(dict *d, void *key);
int dictReplace(dict *d, void *key, void *val);
int dictDelete(dict *d, const void *key);
dictEntry *dictUnlink(dict *ht, const void *key);
void dictFreeUnlinkedEntry(dict *d, dictEntry *he);
void dictRelease(dict *d);
dictEntry * dictFind(dict *d, const void *key);
void *dictFetchValue(dict *d, const void *key);
int dictResize(dict *d);
dictIterator *dictGetIterator(dict *d);
dictIterator *dictGetSafeIterator(dict *d);
dictEntry *dictNext(dictIterator *iter);
void dictReleaseIterator(dictIterator *iter);
dictEntry *dictGetRandomKey(dict *d);
dictEntry *dictGetFairRandomKey(dict *d);
unsigned int dictGetSomeKeys(dict *d, dictEntry **des, unsigned int count);
void dictGetStats(char *buf, size_t bufsize, dict *d);
uint64_t dictGenHashFunction(const void *key, int len);
uint64_t dictGenCaseHashFunction(const unsigned char *buf, int len);
void dictEmpty(dict *d, void(callback)(void*));
void dictEnableResize(void);
void dictDisableResize(void);
int dictRehash(dict *d, int n);
int dictRehashMilliseconds(dict *d, int ms);
void dictSetHashFunctionSeed(uint8_t *seed);
uint8_t *dictGetHashFunctionSeed(void);
unsigned long dictScan(dict *d, unsigned long v, dictScanFunction *fn, dictScanBucketFunction *bucketfn, void *privdata);
uint64_t dictGetHash(dict *d, const void *key);
uint64_t dictGetEntryHash(dict *d, const dictEntry *de);
dictEntry **dictFindEntryRefByPtrAndHash(dict *d, const void *oldptr, uint64_t hash);
/* Hash table types */
extern dictType dictTypeHeapStringCopyKey;
extern dictType dictTypeHeapStrings;
extern dictType dictTypeHeapStringCopyKeyValue;
#endif /* __DICT_H */
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