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openairinterface5g/common/utils/collection/hashtable/hashtable.c
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gauthier e7e95ce345 reverting last 2 commits, do it later 
git-svn-id: http://svn.eurecom.fr/openair4G/trunk@7696 818b1a75-f10b-46b9-bf7c-635c3b92a50f
2015-07-07 13:31:05 +00:00

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/*******************************************************************************
OpenAirInterface
Copyright(c) 1999 - 2014 Eurecom
OpenAirInterface is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
OpenAirInterface is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with OpenAirInterface.The full GNU General Public License is
included in this distribution in the file called "COPYING". If not,
see <http://www.gnu.org/licenses/>.
Contact Information
OpenAirInterface Admin: openair_admin@eurecom.fr
OpenAirInterface Tech : openair_tech@eurecom.fr
OpenAirInterface Dev : openair4g-devel@eurecom.fr
Address : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE
*******************************************************************************/
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include "hashtable.h"
#include "assertions.h"
//-------------------------------------------------------------------------------------------------------------------------------
char* hashtable_rc_code2string(hashtable_rc_t rcP)
//-------------------------------------------------------------------------------------------------------------------------------
{
switch (rcP) {
case HASH_TABLE_OK: return "HASH_TABLE_OK";break;
case HASH_TABLE_INSERT_OVERWRITTEN_DATA: return "HASH_TABLE_INSERT_OVERWRITTEN_DATA";break;
case HASH_TABLE_KEY_NOT_EXISTS: return "HASH_TABLE_KEY_NOT_EXISTS";break;
case HASH_TABLE_KEY_ALREADY_EXISTS: return "HASH_TABLE_KEY_ALREADY_EXISTS";break;
case HASH_TABLE_BAD_PARAMETER_HASHTABLE: return "HASH_TABLE_BAD_PARAMETER_HASHTABLE";break;
default: return "UNKNOWN hashtable_rc_t";
}
}
//-------------------------------------------------------------------------------------------------------------------------------
/*
* free int function
* hash_free_int_func() is used when this hashtable is used to store int values as data (pointer = value).
*/
void hash_free_int_func(void* memoryP){}
//-------------------------------------------------------------------------------------------------------------------------------
/*
* Default hash function
* def_hashfunc() is the default used by hashtable_create() when the user didn't specify one.
* This is a simple/naive hash function which adds the key's ASCII char values. It will probably generate lots of collisions on large hash tables.
*/
static hash_size_t def_hashfunc(const uint64_t keyP)
{
return (hash_size_t)keyP;
}
//-------------------------------------------------------------------------------------------------------------------------------
/*
* Initialisation
* hashtable_create() sets up the initial structure of the hash table. The user specified size will be allocated and initialized to NULL.
* The user can also specify a hash function. If the hashfunc argument is NULL, a default hash function is used.
* If an error occurred, NULL is returned. All other values in the returned hash_table_t pointer should be released with hashtable_destroy().
*/
hash_table_t *hashtable_create(const hash_size_t sizeP, hash_size_t (*hashfuncP)(const hash_key_t ), void (*freefuncP)(void*))
{
hash_table_t *hashtbl = NULL;
if(!(hashtbl=malloc(sizeof(hash_table_t)))) {
return NULL;
}
if(!(hashtbl->nodes=calloc(sizeP, sizeof(hash_node_t*)))) {
free(hashtbl);
return NULL;
}
hashtbl->size=sizeP;
if(hashfuncP) hashtbl->hashfunc=hashfuncP;
else hashtbl->hashfunc=def_hashfunc;
if(freefuncP) hashtbl->freefunc=freefuncP;
else hashtbl->freefunc=free;
return hashtbl;
}
//-------------------------------------------------------------------------------------------------------------------------------
/*
* Cleanup
* The hashtable_destroy() walks through the linked lists for each possible hash value, and releases the elements. It also releases the nodes array and the hash_table_t.
*/
hashtable_rc_t hashtable_destroy(hash_table_t * const hashtblP)
{
hash_size_t n;
hash_node_t *node, *oldnode;
if (hashtblP == NULL) {
return HASH_TABLE_BAD_PARAMETER_HASHTABLE;
}
for(n=0; n<hashtblP->size; ++n) {
node=hashtblP->nodes[n];
while(node) {
oldnode=node;
node=node->next;
if (oldnode->data) {
hashtblP->freefunc(oldnode->data);
}
free(oldnode);
}
}
free(hashtblP->nodes);
free(hashtblP);
return HASH_TABLE_OK;
}
//-------------------------------------------------------------------------------------------------------------------------------
hashtable_rc_t hashtable_is_key_exists (const hash_table_t * const hashtblP, const hash_key_t keyP)
//-------------------------------------------------------------------------------------------------------------------------------
{
hash_node_t *node = NULL;
hash_size_t hash = 0;
if (hashtblP == NULL) {
return HASH_TABLE_BAD_PARAMETER_HASHTABLE;
}
hash=hashtblP->hashfunc(keyP)%hashtblP->size;
node=hashtblP->nodes[hash];
while(node) {
if(node->key == keyP) {
return HASH_TABLE_OK;
}
node=node->next;
}
return HASH_TABLE_KEY_NOT_EXISTS;
}
//-------------------------------------------------------------------------------------------------------------------------------
hashtable_rc_t hashtable_apply_funct_on_elements (hash_table_t *const hashtblP, void functP(hash_key_t keyP, void* dataP, void* parameterP), void* parameterP)
//-------------------------------------------------------------------------------------------------------------------------------
{
hash_node_t *node = NULL;
unsigned int i = 0;
unsigned int num_elements = 0;
if (hashtblP == NULL) {
return HASH_TABLE_BAD_PARAMETER_HASHTABLE;
}
while ((num_elements < hashtblP->num_elements) && (i < hashtblP->size)) {
if (hashtblP->nodes[i] != NULL) {
node=hashtblP->nodes[i];
while(node) {
num_elements += 1;
functP(node->key, node->data, parameterP);
node=node->next;
}
}
i += 1;
}
return HASH_TABLE_OK;
}
//-------------------------------------------------------------------------------------------------------------------------------
hashtable_rc_t hashtable_dump_content (const hash_table_t * const hashtblP, char * const buffer_pP, int * const remaining_bytes_in_buffer_pP )
//-------------------------------------------------------------------------------------------------------------------------------
{
hash_node_t *node = NULL;
unsigned int i = 0;
unsigned int num_elements = 0;
if (hashtblP == NULL) {
*remaining_bytes_in_buffer_pP = snprintf(
buffer_pP,
*remaining_bytes_in_buffer_pP,
"HASH_TABLE_BAD_PARAMETER_HASHTABLE");
return HASH_TABLE_BAD_PARAMETER_HASHTABLE;
}
while ((i < hashtblP->size) && (*remaining_bytes_in_buffer_pP > 0)) {
if (hashtblP->nodes[i] != NULL) {
node=hashtblP->nodes[i];
while(node) {
*remaining_bytes_in_buffer_pP = snprintf(
buffer_pP,
*remaining_bytes_in_buffer_pP,
"Key 0x%"PRIx64" Element %p\n",
node->key,
node->data);
node=node->next;
}
}
i += 1;
}
return HASH_TABLE_OK;
}
//-------------------------------------------------------------------------------------------------------------------------------
/*
* Adding a new element
* To make sure the hash value is not bigger than size, the result of the user provided hash function is used modulo size.
*/
hashtable_rc_t hashtable_insert(hash_table_t * const hashtblP, const hash_key_t keyP, void *dataP)
{
hash_node_t *node = NULL;
hash_size_t hash = 0;
if (hashtblP == NULL) {
return HASH_TABLE_BAD_PARAMETER_HASHTABLE;
}
hash=hashtblP->hashfunc(keyP)%hashtblP->size;
node=hashtblP->nodes[hash];
while(node) {
if(node->key == keyP) {
if (node->data) {
hashtblP->freefunc(node->data);
}
node->data=dataP;
return HASH_TABLE_INSERT_OVERWRITTEN_DATA;
}
node=node->next;
}
if(!(node=malloc(sizeof(hash_node_t)))) return -1;
node->key=keyP;
node->data=dataP;
if (hashtblP->nodes[hash]) {
node->next=hashtblP->nodes[hash];
} else {
node->next = NULL;
}
hashtblP->nodes[hash]=node;
hashtblP->num_elements += 1;
return HASH_TABLE_OK;
}
//-------------------------------------------------------------------------------------------------------------------------------
/*
* To remove an element from the hash table, we just search for it in the linked list for that hash value,
* and remove it if it is found. If it was not found, it is an error and -1 is returned.
*/
hashtable_rc_t hashtable_remove(hash_table_t * const hashtblP, const hash_key_t keyP)
{
hash_node_t *node, *prevnode=NULL;
hash_size_t hash = 0;
if (hashtblP == NULL) {
return HASH_TABLE_BAD_PARAMETER_HASHTABLE;
}
hash=hashtblP->hashfunc(keyP)%hashtblP->size;
node=hashtblP->nodes[hash];
while(node) {
if(node->key == keyP) {
if(prevnode) prevnode->next=node->next;
else hashtblP->nodes[hash]=node->next;
if (node->data) {
hashtblP->freefunc(node->data);
}
free(node);
hashtblP->num_elements -= 1;
return HASH_TABLE_OK;
}
prevnode=node;
node=node->next;
}
return HASH_TABLE_KEY_NOT_EXISTS;
}
//-------------------------------------------------------------------------------------------------------------------------------
/*
* Searching for an element is easy. We just search through the linked list for the corresponding hash value.
* NULL is returned if we didn't find it.
*/
hashtable_rc_t hashtable_get(const hash_table_t * const hashtblP, const hash_key_t keyP, void** dataP)
{
hash_node_t *node = NULL;
hash_size_t hash = 0;
if (hashtblP == NULL) {
*dataP = NULL;
return HASH_TABLE_BAD_PARAMETER_HASHTABLE;
}
hash=hashtblP->hashfunc(keyP)%hashtblP->size;
/* fprintf(stderr, "hashtable_get() key=%s, hash=%d\n", key, hash);*/
node=hashtblP->nodes[hash];
while(node) {
if(node->key == keyP) {
*dataP = node->data;
return HASH_TABLE_OK;
}
node=node->next;
}
*dataP = NULL;
return HASH_TABLE_KEY_NOT_EXISTS;
}
//-------------------------------------------------------------------------------------------------------------------------------
/*
* Resizing
* The number of elements in a hash table is not always known when creating the table.
* If the number of elements grows too large, it will seriously reduce the performance of most hash table operations.
* If the number of elements are reduced, the hash table will waste memory. That is why we provide a function for resizing the table.
* Resizing a hash table is not as easy as a realloc(). All hash values must be recalculated and each element must be inserted into its new position.
* We create a temporary hash_table_t object (newtbl) to be used while building the new hashes.
* This allows us to reuse hashtable_insert() and hashtable_remove(), when moving the elements to the new table.
* After that, we can just free the old table and copy the elements from newtbl to hashtbl.
*/
hashtable_rc_t hashtable_resize(hash_table_t * const hashtblP, const hash_size_t sizeP)
{
hash_table_t newtbl;
hash_size_t n;
hash_node_t *node,*next;
if (hashtblP == NULL) {
return HASH_TABLE_BAD_PARAMETER_HASHTABLE;
}
newtbl.size = sizeP;
newtbl.hashfunc = hashtblP->hashfunc;
if(!(newtbl.nodes=calloc(sizeP, sizeof(hash_node_t*)))) return -1;
for(n=0; n<hashtblP->size; ++n) {
for(node=hashtblP->nodes[n]; node; node=next) {
next = node->next;
hashtable_insert(&newtbl, node->key, node->data);
// Lionel GAUTHIER: BAD CODE TO BE REWRITTEN
hashtable_remove(hashtblP, node->key);
}
}
free(hashtblP->nodes);
hashtblP->size=newtbl.size;
hashtblP->nodes=newtbl.nodes;
return HASH_TABLE_OK;
}
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