hash_value.c 1.76 KB
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>

#include "hash_value.h"
#include "utils/hash.h"
#include "utils/memory.h"
#include "commons.h"
#include "interface/class.h"
#include "interface/hashable.h"

static
int
hashValueCtor(void * _this, va_list * params)
{
	HashValue this = _this;
	char * key     = va_arg(* params, char*);
	void * value;
	
	this->nkey   = va_arg(* params, size_t);
	value        = va_arg(* params, void*);
	this->nvalue = va_arg(* params, size_t);

	this->key = malloc(this->nkey + 1);
	this->key[this->nkey] = 0;
	memcpy(this->key, key, this->nkey);

	this->hash = sdbm((unsigned char *)this->key, this->nkey);

	if (NULL != value) {
		this->value = malloc(this->nvalue + 1);
		((char*)this->value)[this->nvalue] = 0;
		memcpy(this->value, value, this->nvalue);
	}

	return 0;
}

static
void
hashValueDtor(void * _this)
{
	HashValue this = _this;

	FREE(this->key);
	FREE(this->value);
}

static
unsigned long
hashValueGetHash(void * _this)
{
	HashValue this = _this;

	return this->hash;
}

static
void
hashValueHandleDouble(void * _this, void * _double)
{
	HashValue this = _this;
	HashValue doub = _double;
	void * tmp_value;
	size_t tmp_nvalue;

	/**
	 * here we swap the internal data of both objects,
	 * effectively overwriting the old entry. We need not
	 * to free anything here as _double will be deleted
	 * afterwards anyway (\see hash/add.c).
	 */
	tmp_value   = this->value;
	this->value = doub->value;
	doub->value = tmp_value;

	tmp_nvalue   = this->nvalue;
	this->nvalue = doub->nvalue;
	doub->nvalue = tmp_nvalue;
}

INIT_IFACE(Class, hashValueCtor, hashValueDtor, NULL);
INIT_IFACE(Hashable, hashValueGetHash, hashValueHandleDouble);
CREATE_CLASS(HashValue, NULL, IFACE(Class), IFACE(Hashable));

// vim: set ts=4 sw=4: