X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/66d8818cb751ab23e70e82fc5ab1017399f49109..9542d9d8d7e5035e5f884eec3e4f922d51145bd5:/src/dict.c

diff --git a/src/dict.c b/src/dict.c
index f98fdd0e..53e16be0 100644
--- a/src/dict.c
+++ b/src/dict.c
@@ -85,10 +85,20 @@ unsigned int dictIdentityHashFunction(unsigned int key)
     return key;
 }
 
+static int dict_hash_function_seed = 5381;
+
+void dictSetHashFunctionSeed(unsigned int seed) {
+    dict_hash_function_seed = seed;
+}
+
+unsigned int dictGetHashFunctionSeed(void) {
+    return dict_hash_function_seed;
+}
+
 /* Generic hash function (a popular one from Bernstein).
  * I tested a few and this was the best. */
 unsigned int dictGenHashFunction(const unsigned char *buf, int len) {
-    unsigned int hash = 5381;
+    unsigned int hash = dict_hash_function_seed;
 
     while (len--)
         hash = ((hash << 5) + hash) + (*buf++); /* hash * 33 + c */
@@ -97,7 +107,7 @@ unsigned int dictGenHashFunction(const unsigned char *buf, int len) {
 
 /* And a case insensitive version */
 unsigned int dictGenCaseHashFunction(const unsigned char *buf, int len) {
-    unsigned int hash = 5381;
+    unsigned int hash = dict_hash_function_seed;
 
     while (len--)
         hash = ((hash << 5) + hash) + (tolower(*buf++)); /* hash * 33 + c */
@@ -258,6 +268,30 @@ static void _dictRehashStep(dict *d) {
 
 /* Add an element to the target hash table */
 int dictAdd(dict *d, void *key, void *val)
+{
+    dictEntry *entry = dictAddRaw(d,key);
+
+    if (!entry) return DICT_ERR;
+    dictSetVal(d, entry, val);
+    return DICT_OK;
+}
+
+/* Low level add. This function adds the entry but instead of setting
+ * a value returns the dictEntry structure to the user, that will make
+ * sure to fill the value field as he wishes.
+ *
+ * This function is also directly expoed to user API to be called
+ * mainly in order to store non-pointers inside the hash value, example:
+ *
+ * entry = dictAddRaw(dict,mykey);
+ * if (entry != NULL) dictSetSignedIntegerVal(entry,1000);
+ *
+ * Return values:
+ *
+ * If key already exists NULL is returned.
+ * If key was added, the hash entry is returned to be manipulated by the caller.
+ */
+dictEntry *dictAddRaw(dict *d, void *key)
 {
     int index;
     dictEntry *entry;
@@ -268,7 +302,7 @@ int dictAdd(dict *d, void *key, void *val)
     /* Get the index of the new element, or -1 if
      * the element already exists. */
     if ((index = _dictKeyIndex(d, key)) == -1)
-        return DICT_ERR;
+        return NULL;
 
     /* Allocate the memory and store the new entry */
     ht = dictIsRehashing(d) ? &d->ht[1] : &d->ht[0];
@@ -278,9 +312,8 @@ int dictAdd(dict *d, void *key, void *val)
     ht->used++;
 
     /* Set the hash entry fields. */
-    dictSetHashKey(d, entry, key);
-    dictSetHashVal(d, entry, val);
-    return DICT_OK;
+    dictSetKey(d, entry, key);
+    return entry;
 }
 
 /* Add an element, discarding the old if the key already exists.
@@ -303,11 +336,23 @@ int dictReplace(dict *d, void *key, void *val)
      * you want to increment (set), and then decrement (free), and not the
      * reverse. */
     auxentry = *entry;
-    dictSetHashVal(d, entry, val);
-    dictFreeEntryVal(d, &auxentry);
+    dictSetVal(d, entry, val);
+    dictFreeVal(d, &auxentry);
     return 0;
 }
 
+/* dictReplaceRaw() is simply a version of dictAddRaw() that always
+ * returns the hash entry of the specified key, even if the key already
+ * exists and can't be added (in that case the entry of the already
+ * existing key is returned.)
+ *
+ * See dictAddRaw() for more information. */
+dictEntry *dictReplaceRaw(dict *d, void *key) {
+    dictEntry *entry = dictFind(d,key);
+
+    return entry ? entry : dictAddRaw(d,key);
+}
+
 /* Search and remove an element */
 static int dictGenericDelete(dict *d, const void *key, int nofree)
 {
@@ -324,15 +369,15 @@ static int dictGenericDelete(dict *d, const void *key, int nofree)
         he = d->ht[table].table[idx];
         prevHe = NULL;
         while(he) {
-            if (dictCompareHashKeys(d, key, he->key)) {
+            if (dictCompareKeys(d, key, he->key)) {
                 /* Unlink the element from the list */
                 if (prevHe)
                     prevHe->next = he->next;
                 else
                     d->ht[table].table[idx] = he->next;
                 if (!nofree) {
-                    dictFreeEntryKey(d, he);
-                    dictFreeEntryVal(d, he);
+                    dictFreeKey(d, he);
+                    dictFreeVal(d, he);
                 }
                 zfree(he);
                 d->ht[table].used--;
@@ -366,8 +411,8 @@ int _dictClear(dict *d, dictht *ht)
         if ((he = ht->table[i]) == NULL) continue;
         while(he) {
             nextHe = he->next;
-            dictFreeEntryKey(d, he);
-            dictFreeEntryVal(d, he);
+            dictFreeKey(d, he);
+            dictFreeVal(d, he);
             zfree(he);
             ht->used--;
             he = nextHe;
@@ -400,7 +445,7 @@ dictEntry *dictFind(dict *d, const void *key)
         idx = h & d->ht[table].sizemask;
         he = d->ht[table].table[idx];
         while(he) {
-            if (dictCompareHashKeys(d, key, he->key))
+            if (dictCompareKeys(d, key, he->key))
                 return he;
             he = he->next;
         }
@@ -413,7 +458,7 @@ void *dictFetchValue(dict *d, const void *key) {
     dictEntry *he;
 
     he = dictFind(d,key);
-    return he ? dictGetEntryVal(he) : NULL;
+    return he ? dictGetVal(he) : NULL;
 }
 
 dictIterator *dictGetIterator(dict *d)
@@ -572,7 +617,7 @@ static int _dictKeyIndex(dict *d, const void *key)
         /* Search if this slot does not already contain the given key */
         he = d->ht[table].table[idx];
         while(he) {
-            if (dictCompareHashKeys(d, key, he->key))
+            if (dictCompareKeys(d, key, he->key))
                 return -1;
             he = he->next;
         }