sm64coopdx/tools/hashtable.c
2019-08-25 00:46:40 -04:00

89 lines
1.7 KiB
C

#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "hashtable.h"
struct HashNode
{
struct HashNode *next;
uint8_t value[];
};
struct HashTable
{
HashFunc func;
HashValueCmpFunc cmp;
int size;
int elemSize;
struct HashNode *table[];
};
struct HashTable *hashtable_new(HashFunc func, HashValueCmpFunc cmp, int size,
int elemSize)
{
struct HashTable *ht = malloc(sizeof(*ht) + size * sizeof(ht->table[0]));
ht->func = func;
ht->cmp = cmp;
ht->size = size;
ht->elemSize = elemSize;
memset(ht->table, 0, ht->size * sizeof(ht->table[0]));
return ht;
}
void hashtable_free(struct HashTable *ht)
{
int i;
for (i = 0; i < ht->size; i++)
{
struct HashNode *node = ht->table[i];
while (node != NULL)
{
struct HashNode *next = node->next;
free(node);
node = next;
}
}
free(ht);
}
void hashtable_insert(struct HashTable *ht, const void *value)
{
unsigned int key = ht->func(value) % ht->size;
struct HashNode *node = malloc(sizeof(*node) + ht->elemSize);
node->next = NULL;
memcpy(node->value, value, ht->elemSize);
if (ht->table[key] == NULL)
{
ht->table[key] = node;
}
else
{
struct HashNode *parent = ht->table[key];
while (parent->next != NULL)
parent = parent->next;
parent->next = node;
}
}
void *hashtable_query(struct HashTable *ht, const void *value)
{
unsigned int key = ht->func(value) % ht->size;
struct HashNode *node = ht->table[key];
while (node != NULL)
{
if (ht->cmp(node->value, value))
return node->value;
node = node->next;
}
return NULL;
}