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hash.c
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hash.c
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// Copyright 2015-2021 The NATS Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "natsp.h"
#include <string.h>
#include "status.h"
#include "mem.h"
#include "hash.h"
#define _freeEntry(e) { NATS_FREE(e); (e) = NULL; }
#define _OFF32 (2166136261)
#define _YP32 (709607)
#define _BSZ (8)
#define _WSZ (4)
static int _DWSZ = _WSZ << 1; // 8
static int _DDWSZ = _WSZ << 2; // 16
static int _MAX_BKT_SIZE = (1 << 30) - 1;
natsStatus
natsHash_Create(natsHash **newHash, int initialSize)
{
natsHash *hash = NULL;
if (initialSize <= 0)
return nats_setDefaultError(NATS_INVALID_ARG);
if ((initialSize & (initialSize - 1)) != 0)
{
// Size of buckets must be power of 2
initialSize--;
initialSize |= initialSize >> 1;
initialSize |= initialSize >> 2;
initialSize |= initialSize >> 4;
initialSize |= initialSize >> 8;
initialSize |= initialSize >> 16;
initialSize++;
}
hash = (natsHash*) NATS_CALLOC(1, sizeof(natsHash));
if (hash == NULL)
return nats_setDefaultError(NATS_NO_MEMORY);
hash->mask = (initialSize - 1);
hash->numBkts = initialSize;
hash->canResize = true;
hash->bkts = (natsHashEntry**) NATS_CALLOC(initialSize, sizeof(natsHashEntry*));
if (hash->bkts == NULL)
{
NATS_FREE(hash);
return nats_setDefaultError(NATS_NO_MEMORY);
}
*newHash = hash;
return NATS_OK;
}
static natsStatus
_resize(natsHash *hash, int newSize)
{
natsHashEntry **bkts = NULL;
int newMask = newSize - 1;
natsHashEntry *ne;
natsHashEntry *e;
int k;
int newIndex;
bkts = (natsHashEntry**) NATS_CALLOC(newSize, sizeof(natsHashEntry*));
if (bkts == NULL)
return nats_setDefaultError(NATS_NO_MEMORY);
for (k = 0; k < hash->numBkts; k++)
{
e = hash->bkts[k];
while (e != NULL)
{
ne = e;
e = e->next;
newIndex = ne->key & newMask;
ne->next = bkts[newIndex];
bkts[newIndex] = ne;
}
}
NATS_FREE(hash->bkts);
hash->bkts = bkts;
hash->mask = newMask;
hash->numBkts = newSize;
return NATS_OK;
}
static natsStatus
_grow(natsHash *hash)
{
// Can't grow beyond max signed int for now
if (hash->numBkts >= _MAX_BKT_SIZE)
return nats_setDefaultError(NATS_NO_MEMORY);
return _resize(hash, 2 * (hash->numBkts));
}
static void
_shrink(natsHash *hash)
{
if (hash->numBkts <= _BSZ)
return;
// Ignore memory issue when resizing, since if we fail to allocate
// the original hash is still intact.
(void) _resize(hash, hash->numBkts / 2);
}
static natsHashEntry*
_createEntry(int64_t key, void *data)
{
natsHashEntry *e = (natsHashEntry*) NATS_MALLOC(sizeof(natsHashEntry));
if (e == NULL)
return NULL;
e->key = key;
e->data = data;
e->next = NULL;
return e;
}
natsStatus
natsHash_Set(natsHash *hash, int64_t key, void *data, void **oldData)
{
natsStatus s = NATS_OK;
int index = (int) (key & hash->mask);
natsHashEntry *newEntry = NULL;
natsHashEntry *e;
if (oldData != NULL)
*oldData = NULL;
e = (natsHashEntry*) hash->bkts[index];
while (e != NULL)
{
if (e->key == key)
{
// Success, replace data field
if (oldData != NULL)
*oldData = e->data;
e->data = data;
return NATS_OK;
}
e = e->next;
}
// We have a new entry here
newEntry = _createEntry(key, data);
if (newEntry == NULL)
return nats_setDefaultError(NATS_NO_MEMORY);
newEntry->next = hash->bkts[index];
hash->bkts[index] = newEntry;
hash->used++;
// Check for resizing
if (hash->canResize && (hash->used > hash->numBkts))
s = _grow(hash);
return NATS_UPDATE_ERR_STACK(s);
}
void*
natsHash_Get(natsHash *hash, int64_t key)
{
natsHashEntry *e;
e = hash->bkts[key & hash->mask];
while (e != NULL)
{
if (e->key == key)
return e->data;
e = e->next;
}
return NULL;
}
static void
_maybeShrink(natsHash *hash)
{
if (hash->canResize
&& (hash->numBkts > _BSZ)
&& (hash->used < hash->numBkts / 4))
{
_shrink(hash);
}
}
void*
natsHash_Remove(natsHash *hash, int64_t key)
{
natsHashEntry *entryRemoved = NULL;
void *dataRemoved = NULL;
natsHashEntry **e;
e = (natsHashEntry**) &(hash->bkts[key & hash->mask]);
while (*e != NULL)
{
if ((*e)->key == key)
{
// Success
entryRemoved = *e;
dataRemoved = entryRemoved->data;
*e = entryRemoved->next;
_freeEntry(entryRemoved);
hash->used--;
// Check for resizing
_maybeShrink(hash);
break;
}
e = (natsHashEntry**) &((*e)->next);
}
return dataRemoved;
}
natsStatus
natsHash_RemoveSingle(natsHash *hash, int64_t *key, void **data)
{
natsHashEntry *e = NULL;
int i;
if (hash->used != 1)
return nats_setDefaultError(NATS_ERR);
for (i=0; i<hash->numBkts; i++)
{
e = hash->bkts[i];
if (e != NULL)
{
if (key != NULL)
*key = e->key;
if (data != NULL)
*data = e->data;
_freeEntry(e);
hash->used--;
hash->bkts[i] = NULL;
// Check for resizing
_maybeShrink(hash);
break;
}
}
return NATS_OK;
}
void
natsHash_Destroy(natsHash *hash)
{
natsHashEntry *e, *ne;
int i;
if (hash == NULL)
return;
for (i = 0; i < hash->numBkts; i++)
{
e = hash->bkts[i];
while (e != NULL)
{
ne = e->next;
_freeEntry(e);
e = ne;
}
}
NATS_FREE(hash->bkts);
NATS_FREE(hash);
}
void
natsHashIter_Init(natsHashIter *iter, natsHash *hash)
{
memset(iter, 0, sizeof(natsHashIter));
hash->canResize = false;
iter->hash = hash;
iter->current = hash->bkts[0];
iter->next = iter->current;
}
bool
natsHashIter_Next(natsHashIter *iter, int64_t *key, void **value)
{
if ((iter->started) && (iter->next == NULL))
return false;
if (!(iter->started) && (iter->current == NULL))
{
while ((iter->next == NULL)
&& (iter->currBkt < (iter->hash->numBkts - 1)))
{
iter->next = iter->hash->bkts[++(iter->currBkt)];
}
if (iter->next == NULL)
{
iter->started = true;
return false;
}
}
iter->started = true;
iter->current = iter->next;
if (iter->current != NULL)
{
if (key != NULL)
*key = iter->current->key;
if (value != NULL)
*value = iter->current->data;
iter->next = iter->current->next;
}
while ((iter->next == NULL)
&& (iter->currBkt < (iter->hash->numBkts - 1)))
{
iter->next = iter->hash->bkts[++(iter->currBkt)];
}
return true;
}
natsStatus
natsHashIter_RemoveCurrent(natsHashIter *iter)
{
int64_t key;
if (iter->current == NULL)
return nats_setDefaultError(NATS_NOT_FOUND);
key = iter->current->key;
iter->current = iter->next;
(void) natsHash_Remove(iter->hash, key);
return NATS_OK;
}
void
natsHashIter_Done(natsHashIter *iter)
{
iter->hash->canResize = true;
}
// Jesteress derivative of FNV1A from [http://www.sanmayce.com/Fastest_Hash/]
uint32_t
natsStrHash_Hash(const char *data, int dataLen)
{
int i = 0;
int dlen = dataLen;
uint32_t h32 = (uint32_t)_OFF32;
uint64_t k1, k2;
uint32_t k3;
for (; dlen >= _DDWSZ; dlen -= _DDWSZ)
{
memcpy(&k1, &(data[i]), sizeof(k1));
memcpy(&k2, &(data[i + 4]), sizeof(k2));
h32 = (uint32_t) ((((uint64_t) h32) ^ ((k1<<5 | k1>>27) ^ k2)) * _YP32);
i += _DDWSZ;
}
// Cases: 0,1,2,3,4,5,6,7
if ((dlen & _DWSZ) != 0)
{
memcpy(&k1, &(data[i]), sizeof(k1));
h32 = (uint32_t) ((((uint64_t) h32) ^ k1) * _YP32);
i += _DWSZ;
}
if ((dlen & _WSZ) != 0)
{
memcpy(&k3, &(data[i]), sizeof(k3));
h32 = (uint32_t) ((((uint64_t) h32) ^ (uint64_t) k3) * _YP32);
i += _WSZ;
}
if ((dlen & 1) != 0)
{
h32 = (h32 ^ (uint32_t)(data[i])) * _YP32;
}
return h32 ^ (h32 >> 16);
}
natsStatus
natsStrHash_Create(natsStrHash **newHash, int initialSize)
{
natsStrHash *hash = NULL;
if (initialSize <= 0)
return nats_setDefaultError(NATS_INVALID_ARG);
if ((initialSize & (initialSize - 1)) != 0)
{
// Size of buckets must be power of 2
initialSize--;
initialSize |= initialSize >> 1;
initialSize |= initialSize >> 2;
initialSize |= initialSize >> 4;
initialSize |= initialSize >> 8;
initialSize |= initialSize >> 16;
initialSize++;
}
hash = (natsStrHash*) NATS_CALLOC(1, sizeof(natsStrHash));
if (hash == NULL)
return nats_setDefaultError(NATS_NO_MEMORY);
hash->mask = (initialSize - 1);
hash->numBkts = initialSize;
hash->canResize = true;
hash->bkts = (natsStrHashEntry**) NATS_CALLOC(initialSize, sizeof(natsStrHashEntry*));
if (hash->bkts == NULL)
{
NATS_FREE(hash);
return nats_setDefaultError(NATS_NO_MEMORY);
}
*newHash = hash;
return NATS_OK;
}
static natsStatus
_resizeStr(natsStrHash *hash, int newSize)
{
natsStrHashEntry **bkts = NULL;
int newMask = newSize - 1;
natsStrHashEntry *ne;
natsStrHashEntry *e;
int k;
int newIndex;
bkts = (natsStrHashEntry**) NATS_CALLOC(newSize, sizeof(natsStrHashEntry*));
if (bkts == NULL)
return nats_setDefaultError(NATS_NO_MEMORY);
for (k = 0; k < hash->numBkts; k++)
{
e = hash->bkts[k];
while (e != NULL)
{
ne = e;
e = e->next;
newIndex = ne->hk & newMask;
ne->next = bkts[newIndex];
bkts[newIndex] = ne;
}
}
NATS_FREE(hash->bkts);
hash->bkts = bkts;
hash->mask = newMask;
hash->numBkts = newSize;
return NATS_OK;
}
static natsStatus
_growStr(natsStrHash *hash)
{
// Can't grow beyond max signed int for now
if (hash->numBkts >= _MAX_BKT_SIZE)
return nats_setDefaultError(NATS_NO_MEMORY);
return _resizeStr(hash, 2 * (hash->numBkts));
}
static void
_shrinkStr(natsStrHash *hash)
{
if (hash->numBkts <= _BSZ)
return;
// Ignore memory issue when resizing, since if we fail to allocate
// the original hash is still intact.
(void) _resizeStr(hash, hash->numBkts / 2);
}
static natsStrHashEntry*
_createStrEntry(uint32_t hk, char *key, bool copyKey, bool freeKey, void *data)
{
natsStrHashEntry *e = (natsStrHashEntry*) NATS_MALLOC(sizeof(natsStrHashEntry));
if (e == NULL)
return NULL;
e->hk = hk;
e->key = (copyKey ? NATS_STRDUP(key) : key);
e->freeKey = freeKey;
e->data = data;
e->next = NULL;
if (e->key == NULL)
{
NATS_FREE(e);
return NULL;
}
return e;
}
// Note that it would be invalid to call with copyKey:true and freeKey:false,
// since this would lead to a memory leak.
natsStatus
natsStrHash_SetEx(natsStrHash *hash, char *key, bool copyKey, bool freeKey,
void *data, void **oldData)
{
natsStatus s = NATS_OK;
uint32_t hk = 0;
int index = 0;
natsStrHashEntry *newEntry = NULL;
natsStrHashEntry *e;
char *oldKey;
if (oldData != NULL)
*oldData = NULL;
hk = natsStrHash_Hash(key, (int) strlen(key));
index = hk & hash->mask;
e = (natsStrHashEntry*) hash->bkts[index];
while (e != NULL)
{
if ((e->hk == hk)
&& (strcmp(e->key, key) == 0))
{
// Success, replace data field
if (oldData != NULL)
*oldData = e->data;
e->data = data;
// Need to care for situations where previous call
// for same key hash was with different pointers and or
// "config" values (copyKey/freeKey).
// But if nothing has changed (same pointers and config) we
// can bail early.
if ((key == e->key) && (freeKey == e->freeKey))
return NATS_OK;
oldKey = e->key;
// First try to dup the key if required.
if (copyKey)
{
char *newKey = NATS_STRDUP(key);
if (newKey == NULL)
return nats_setDefaultError(NATS_NO_MEMORY);
e->key = newKey;
}
// If old config say that we had ownership, then free the
// old key now.
if (e->freeKey)
NATS_FREE(oldKey);
// Keep track of ownership of this key (copied or not).
e->freeKey = freeKey;
return NATS_OK;
}
e = e->next;
}
// We have a new entry here
newEntry = _createStrEntry(hk, key, copyKey, freeKey, data);
if (newEntry == NULL)
return nats_setDefaultError(NATS_NO_MEMORY);
newEntry->next = hash->bkts[index];
hash->bkts[index] = newEntry;
hash->used++;
// Check for resizing
if (hash->canResize && (hash->used > hash->numBkts))
s = _growStr(hash);
return NATS_UPDATE_ERR_STACK(s);
}
void*
natsStrHash_GetEx(natsStrHash *hash, char *key, int keyLen)
{
natsStrHashEntry *e;
uint32_t hk = natsStrHash_Hash(key, keyLen);
e = hash->bkts[hk & hash->mask];
while (e != NULL)
{
if ((e->hk == hk)
&& (strncmp(e->key, key, keyLen) == 0))
{
return e->data;
}
e = e->next;
}
return NULL;
}
static void
_freeStrEntry(natsStrHashEntry *e)
{
if (e->freeKey)
NATS_FREE(e->key);
NATS_FREE(e);
}
static void
_maybeShrinkStr(natsStrHash *hash)
{
if (hash->canResize
&& (hash->numBkts > _BSZ)
&& (hash->used < hash->numBkts / 4))
{
_shrinkStr(hash);
}
}
void*
natsStrHash_Remove(natsStrHash *hash, char *key)
{
natsStrHashEntry *entryRemoved = NULL;
void *dataRemoved = NULL;
natsStrHashEntry **e;
uint32_t hk;
hk = natsStrHash_Hash(key, (int) strlen(key));
e = (natsStrHashEntry**) &(hash->bkts[hk & hash->mask]);
while (*e != NULL)
{
if (((*e)->hk == hk)
&& (strcmp((*e)->key, key) == 0))
{
// Success
entryRemoved = *e;
dataRemoved = entryRemoved->data;
*e = entryRemoved->next;
_freeStrEntry(entryRemoved);
hash->used--;
// Check for resizing
_maybeShrinkStr(hash);
break;
}
e = (natsStrHashEntry**) &((*e)->next);
}
return dataRemoved;
}
natsStatus
natsStrHash_RemoveSingle(natsStrHash *hash, char **key, void **data)
{
natsStrHashEntry *e = NULL;
int i;
if (hash->used != 1)
return nats_setDefaultError(NATS_ERR);
for (i=0; i<hash->numBkts; i++)
{
e = hash->bkts[i];
if (e != NULL)
{
if (key != NULL)
{
char *retKey = e->key;
if (e->freeKey)
{
retKey = NATS_STRDUP(e->key);
if (retKey == NULL)
return nats_setDefaultError(NATS_NO_MEMORY);
}
*key = retKey;
}
if (data != NULL)
*data = e->data;
_freeStrEntry(e);
hash->used--;
hash->bkts[i] = NULL;
// Check for resizing
_maybeShrinkStr(hash);
break;
}
}
return NATS_OK;
}
void
natsStrHash_Destroy(natsStrHash *hash)
{
natsStrHashEntry *e, *ne;
int i;
if (hash == NULL)
return;
for (i = 0; i < hash->numBkts; i++)
{
e = hash->bkts[i];
while (e != NULL)
{
ne = e->next;
_freeStrEntry(e);
e = ne;
}
}
NATS_FREE(hash->bkts);
NATS_FREE(hash);
}
void
natsStrHashIter_Init(natsStrHashIter *iter, natsStrHash *hash)
{
memset(iter, 0, sizeof(natsStrHashIter));
hash->canResize = false;
iter->hash = hash;
iter->current = hash->bkts[0];
iter->next = iter->current;
}
bool
natsStrHashIter_Next(natsStrHashIter *iter, char **key, void **value)
{
if ((iter->started) && (iter->next == NULL))
return false;
if (!(iter->started) && (iter->current == NULL))
{
while ((iter->next == NULL)
&& (iter->currBkt < (iter->hash->numBkts - 1)))
{
iter->next = iter->hash->bkts[++(iter->currBkt)];
}
if (iter->next == NULL)
{
iter->started = true;
return false;
}
}
iter->started = true;
iter->current = iter->next;
if (iter->current != NULL)
{
if (key != NULL)
*key = iter->current->key;
if (value != NULL)
*value = iter->current->data;
iter->next = iter->current->next;
}
while ((iter->next == NULL)
&& (iter->currBkt < (iter->hash->numBkts - 1)))
{
iter->next = iter->hash->bkts[++(iter->currBkt)];
}
return true;
}
natsStatus
natsStrHashIter_RemoveCurrent(natsStrHashIter *iter)
{
char *key;
if (iter->current == NULL)
return nats_setDefaultError(NATS_NOT_FOUND);
key = iter->current->key;
iter->current = iter->next;
(void) natsStrHash_Remove(iter->hash, key);
return NATS_OK;
}
void
natsStrHashIter_Done(natsStrHashIter *iter)
{
natsHashIter_Done((natsHashIter*) iter);
}