Commit 0a96b5a8 authored by gauthier's avatar gauthier

bug in obj_hashtable

git-svn-id: http://svn.eurecom.fr/openair4G/trunk@7694 818b1a75-f10b-46b9-bf7c-635c3b92a50f
parent 1a24edeb
......@@ -172,14 +172,19 @@ hashtable_rc_t hashtable_apply_funct_on_elements (hash_table_t *const hashtblP,
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 )
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;
int rc;
if (hashtblP == NULL) {
*remaining_bytes_in_buffer_pP = snprintf(
rc = snprintf(
buffer_pP,
*remaining_bytes_in_buffer_pP,
"HASH_TABLE_BAD_PARAMETER_HASHTABLE");
......@@ -189,13 +194,18 @@ hashtable_rc_t hashtable_dump_content (const hash_table_t * const hashtblP, char
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);
rc = snprintf(
buffer_pP,
*remaining_bytes_in_buffer_pP,
"Key 0x%"PRIx64" Element %p\n",
node->key,
node->data);
node=node->next;
if ((0 > rc) || (*remaining_bytes_in_buffer_pP < rc)) {
fprintf(stderr, "Error while dumping hashtable content");
} else {
*remaining_bytes_in_buffer_pP -= rc;
}
}
}
i += 1;
......@@ -242,10 +252,10 @@ hashtable_rc_t hashtable_insert(hash_table_t * const hashtblP, const hash_key_t
}
//-------------------------------------------------------------------------------------------------------------------------------
/*
* 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.
* To free an element from the hash table, we just search for it in the linked list for that hash value,
* and free 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)
hashtable_rc_t hashtable_free(hash_table_t * const hashtblP, const hash_key_t keyP)
{
hash_node_t *node, *prevnode=NULL;
hash_size_t hash = 0;
......@@ -271,6 +281,36 @@ hashtable_rc_t hashtable_remove(hash_table_t * const hashtblP, const hash_key_t
}
return HASH_TABLE_KEY_NOT_EXISTS;
}
//-------------------------------------------------------------------------------------------------------------------------------
/*
* 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, void** dataP)
{
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;
*dataP = 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.
......@@ -308,7 +348,7 @@ hashtable_rc_t hashtable_get(const hash_table_t * const hashtblP, const hash_key
* 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.
* This allows us to reuse hashtable_insert() and hashtable_free(), 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.
*/
......@@ -332,7 +372,7 @@ hashtable_rc_t hashtable_resize(hash_table_t * const hashtblP, const hash_size_t
next = node->next;
hashtable_insert(&newtbl, node->key, node->data);
// Lionel GAUTHIER: BAD CODE TO BE REWRITTEN
hashtable_remove(hashtblP, node->key);
hashtable_free(hashtblP, node->key);
}
}
......
......@@ -49,6 +49,9 @@ typedef enum hashtable_return_code_e {
HASH_TABLE_CODE_MAX
} hashtable_rc_t;
#define HASH_TABLE_DEFAULT_HASH_FUNC NULL
#define HASH_TABLE_DEFAULT_FREE_FUNC NULL
typedef struct hash_node_s {
hash_key_t key;
......@@ -72,7 +75,8 @@ hashtable_rc_t hashtable_is_key_exists (const hash_table_t * const hashtbl, con
hashtable_rc_t hashtable_apply_funct_on_elements (hash_table_t * const hashtblP, void funct(hash_key_t keyP, void* dataP, void* parameterP), void* parameterP);
hashtable_rc_t hashtable_dump_content (const hash_table_t * const hashtblP, char * const buffer_pP, int * const remaining_bytes_in_buffer_pP );
hashtable_rc_t hashtable_insert (hash_table_t * const hashtbl, const hash_key_t key, void *data);
hashtable_rc_t hashtable_remove (hash_table_t * const hashtbl, const hash_key_t key);
hashtable_rc_t hashtable_free (hash_table_t * const hashtbl, const hash_key_t key);
hashtable_rc_t hashtable_remove(hash_table_t * const hashtblP, const hash_key_t keyP, void** dataP);
hashtable_rc_t hashtable_get (const hash_table_t * const hashtbl, const hash_key_t key, void **dataP);
hashtable_rc_t hashtable_resize (hash_table_t * const hashtbl, const hash_size_t size);
......
......@@ -30,6 +30,7 @@
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include "obj_hashtable.h"
//-------------------------------------------------------------------------------------------------------------------------------
/*
......@@ -38,11 +39,11 @@
* 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 void *keyP, int key_sizeP)
static hash_size_t def_hashfunc(const void * const keyP, int key_sizeP)
{
hash_size_t hash=0;
while(key_sizeP) hash^=((unsigned char*)keyP)[key_sizeP --];
while(key_sizeP) hash^=((unsigned char*)keyP)[--key_sizeP];
return hash;
}
......@@ -54,7 +55,7 @@ static hash_size_t def_hashfunc(const void *keyP, int key_sizeP)
* 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 obj_hash_table_t pointer should be released with hashtable_destroy().
*/
obj_hash_table_t *obj_hashtable_create(hash_size_t sizeP, hash_size_t (*hashfuncP)(const void*, int ), void (*freekeyfuncP)(void*), void (*freedatafuncP)(void*))
obj_hash_table_t *obj_hashtable_create(const hash_size_t sizeP, hash_size_t (*hashfuncP)(const void*, int ), void (*freekeyfuncP)(void*), void (*freedatafuncP)(void*))
{
obj_hash_table_t *hashtbl;
......@@ -83,7 +84,7 @@ obj_hash_table_t *obj_hashtable_create(hash_size_t sizeP, hash_size_t (*hashfunc
* 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 obj_hash_table_t.
*/
hashtable_rc_t obj_hashtable_destroy(obj_hash_table_t *hashtblP)
hashtable_rc_t obj_hashtable_destroy(obj_hash_table_t * const hashtblP)
{
hash_size_t n;
obj_hash_node_t *node, *oldnode;
......@@ -103,7 +104,7 @@ hashtable_rc_t obj_hashtable_destroy(obj_hash_table_t *hashtblP)
return HASH_TABLE_OK;
}
//-------------------------------------------------------------------------------------------------------------------------------
hashtable_rc_t obj_hashtable_is_key_exists (obj_hash_table_t *hashtblP, void* keyP, int key_sizeP)
hashtable_rc_t obj_hashtable_is_key_exists (const obj_hash_table_t * const hashtblP, const void* const keyP, const int key_sizeP)
//-------------------------------------------------------------------------------------------------------------------------------
{
obj_hash_node_t *node;
......@@ -126,12 +127,55 @@ hashtable_rc_t obj_hashtable_is_key_exists (obj_hash_table_t *hashtblP, void* ke
}
return HASH_TABLE_KEY_NOT_EXISTS;
}
//-------------------------------------------------------------------------------------------------------------------------------
hashtable_rc_t obj_hashtable_dump_content (
const obj_hash_table_t * const hashtblP,
char * const buffer_pP,
int * const remaining_bytes_in_buffer_pP)
//-------------------------------------------------------------------------------------------------------------------------------
{
obj_hash_node_t *node = NULL;
unsigned int i = 0;
unsigned int num_elements = 0;
int rc;
if (hashtblP == NULL) {
rc = 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) {
rc = snprintf(
buffer_pP,
*remaining_bytes_in_buffer_pP,
"Hash 0x%x Key 0x%"PRIx64" Element %p\n",
i,
node->key,
node->data);
node=node->next;
if ((0 > rc) || (*remaining_bytes_in_buffer_pP < rc)) {
fprintf(stderr, "Error while dumping hashtable content");
} else {
*remaining_bytes_in_buffer_pP -= rc;
}
}
}
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 obj_hashtable_insert(obj_hash_table_t *hashtblP, void* keyP, int key_sizeP, void *dataP)
hashtable_rc_t obj_hashtable_insert(obj_hash_table_t * const hashtblP, const void* const keyP, const int key_sizeP, void *dataP)
{
obj_hash_node_t *node;
hash_size_t hash;
......@@ -146,15 +190,21 @@ hashtable_rc_t obj_hashtable_insert(obj_hash_table_t *hashtblP, void* keyP, int
if (node->data) {
hashtblP->freedatafunc(node->data);
}
node->data=dataP;
node->data = dataP;
node->key_size = key_sizeP;
// waste of memory here (keyP is lost) we should free it now
return HASH_TABLE_INSERT_OVERWRITTEN_DATA;
}
node=node->next;
}
if(!(node=malloc(sizeof(obj_hash_node_t)))) return -1;
node->key=keyP;
node->data=dataP;
if(!(node->key=malloc(key_sizeP))) {
free(node);
return -1;
}
memcpy(node->key, keyP, key_sizeP);
node->data = dataP;
node->key_size = key_sizeP;
if (hashtblP->nodes[hash]) {
node->next=hashtblP->nodes[hash];
} else {
......@@ -162,13 +212,45 @@ hashtable_rc_t obj_hashtable_insert(obj_hash_table_t *hashtblP, void* keyP, int
}
hashtblP->nodes[hash]=node;
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 obj_hashtable_free(obj_hash_table_t * const hashtblP, const void* const keyP, const int key_sizeP)
{
obj_hash_node_t *node, *prevnode=NULL;
hash_size_t hash;
if (hashtblP == NULL) {
return HASH_TABLE_BAD_PARAMETER_HASHTABLE;
}
hash=hashtblP->hashfunc(keyP, key_sizeP)%hashtblP->size;
node=hashtblP->nodes[hash];
while(node) {
if ((node->key == keyP) || ((node->key_size == key_sizeP) && (memcmp(node->key, keyP, key_sizeP) == 0))){
if(prevnode) {
prevnode->next=node->next;
} else {
hashtblP->nodes[hash]=node->next;
}
hashtblP->freekeyfunc(node->key);
hashtblP->freedatafunc(node->data);
free(node);
return HASH_TABLE_OK;
}
prevnode=node;
node=node->next;
}
return HASH_TABLE_KEY_NOT_EXISTS;
}
//-------------------------------------------------------------------------------------------------------------------------------
/*
* 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 obj_hashtable_remove(obj_hash_table_t *hashtblP, const void* keyP, int key_sizeP)
hashtable_rc_t obj_hashtable_remove(obj_hash_table_t * const hashtblP, const void* const keyP, const int key_sizeP, void** dataP)
{
obj_hash_node_t *node, *prevnode=NULL;
hash_size_t hash;
......@@ -187,7 +269,7 @@ hashtable_rc_t obj_hashtable_remove(obj_hash_table_t *hashtblP, const void* keyP
hashtblP->nodes[hash]=node->next;
}
hashtblP->freekeyfunc(node->key);
hashtblP->freedatafunc(node->data);
*dataP = node->data;
free(node);
return HASH_TABLE_OK;
}
......@@ -201,7 +283,7 @@ hashtable_rc_t obj_hashtable_remove(obj_hash_table_t *hashtblP, const void* keyP
* 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 obj_hashtable_get(obj_hash_table_t *hashtblP, const void* keyP, int key_sizeP, void** dataP)
hashtable_rc_t obj_hashtable_get(const obj_hash_table_t *const hashtblP, const void* const keyP, const int key_sizeP, void** dataP)
{
obj_hash_node_t *node;
hash_size_t hash;
......@@ -231,7 +313,7 @@ hashtable_rc_t obj_hashtable_get(obj_hash_table_t *hashtblP, const void* keyP, i
/*
* Function to return all keys of an object hash table
*/
hashtable_rc_t obj_hashtable_get_keys(obj_hash_table_t *hashtblP, void ** keysP, unsigned int *sizeP)
hashtable_rc_t obj_hashtable_get_keys(const obj_hash_table_t * const hashtblP, void ** keysP, unsigned int * sizeP)
{
size_t n = 0;
obj_hash_node_t *node = NULL;
......@@ -258,10 +340,10 @@ hashtable_rc_t obj_hashtable_get_keys(obj_hash_table_t *hashtblP, void ** keysP,
* 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 obj_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.
* This allows us to reuse hashtable_insert() and hashtable_free(), 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 obj_hashtable_resize(obj_hash_table_t *hashtblP, hash_size_t sizeP)
hashtable_rc_t obj_hashtable_resize(obj_hash_table_t * const hashtblP, const hash_size_t sizeP)
{
obj_hash_table_t newtbl;
hash_size_t n;
......@@ -280,7 +362,7 @@ hashtable_rc_t obj_hashtable_resize(obj_hash_table_t *hashtblP, hash_size_t size
for(node=hashtblP->nodes[n]; node; node=next) {
next = node->next;
obj_hashtable_insert(&newtbl, node->key, node->key_size, node->data);
obj_hashtable_remove(hashtblP, node->key, node->key_size);
obj_hashtable_free(hashtblP, node->key, node->key_size);
}
}
......
......@@ -52,14 +52,16 @@ typedef struct obj_hash_table_s {
void (*freedatafunc)(void*);
} obj_hash_table_t;
obj_hash_table_t *obj_hashtable_create (hash_size_t size, hash_size_t (*hashfunc)(const void*, int ), void (*freekeyfunc)(void*), void (*freedatafunc)(void*));
hashtable_rc_t obj_hashtable_destroy (obj_hash_table_t *hashtblP);
hashtable_rc_t obj_hashtable_is_key_exists (obj_hash_table_t *hashtblP, void* keyP, int key_sizeP);
hashtable_rc_t obj_hashtable_insert (obj_hash_table_t *hashtblP, void* keyP, int key_sizeP, void *dataP);
hashtable_rc_t obj_hashtable_remove (obj_hash_table_t *hashtblP, const void* keyP, int key_sizeP);
hashtable_rc_t obj_hashtable_get (obj_hash_table_t *hashtblP, const void* keyP, int key_sizeP, void ** dataP);
hashtable_rc_t obj_hashtable_get_keys(obj_hash_table_t *hashtblP, void ** keysP, unsigned int *sizeP);
hashtable_rc_t obj_hashtable_resize (obj_hash_table_t *hashtblP, hash_size_t sizeP);
obj_hash_table_t *obj_hashtable_create (const hash_size_t size, hash_size_t (*hashfunc)(const void*, int ), void (*freekeyfunc)(void*), void (*freedatafunc)(void*));
hashtable_rc_t obj_hashtable_destroy (obj_hash_table_t * const hashtblP);
hashtable_rc_t obj_hashtable_is_key_exists (const obj_hash_table_t * const hashtblP, const void* const keyP, const int key_sizeP);
hashtable_rc_t obj_hashtable_insert (obj_hash_table_t * const hashtblP, const void* const keyP, const int key_sizeP, void *dataP);
hashtable_rc_t obj_hashtable_dump_content (const obj_hash_table_t * const hashtblP,char * const buffer_pP,int * const remaining_bytes_in_buffer_pP);
hashtable_rc_t obj_hashtable_free (obj_hash_table_t *hashtblP, const void* keyP, const int key_sizeP);
hashtable_rc_t obj_hashtable_remove(obj_hash_table_t *hashtblP, const void* keyP, const int key_sizeP, void** dataP);
hashtable_rc_t obj_hashtable_get (const obj_hash_table_t * const hashtblP, const void* const keyP, const int key_sizeP, void ** dataP);
hashtable_rc_t obj_hashtable_get_keys(const obj_hash_table_t * const hashtblP, void ** keysP, unsigned int * sizeP);
hashtable_rc_t obj_hashtable_resize (obj_hash_table_t * const hashtblP, const hash_size_t sizeP);
#endif
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