value.c
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/**
* \file
*
* \author Georg Hopp
*
* \copyright
* Copyright © 2012 Georg Hopp
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include "trbase.h"
#include "trhash.h"
#include "tr/hash_value.h"
#include "tr/interface/hashable.h"
static
int
hashValueCtor(void * _this, va_list * params)
{
TR_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 = TR_malloc(this->nkey + 1);
this->key[this->nkey] = 0;
memcpy(this->key, key, this->nkey);
this->hash = TR_sdbm((unsigned char *)this->key, this->nkey);
if (NULL != value) {
this->value = TR_malloc(this->nvalue + 1);
((char*)this->value)[this->nvalue] = 0;
memcpy(this->value, value, this->nvalue);
}
return 0;
}
static
void
hashValueDtor(void * _this)
{
TR_HashValue this = _this;
TR_MEM_FREE(this->key);
TR_MEM_FREE(this->value);
}
static
unsigned long
hashValueGetHash(void * _this)
{
TR_HashValue this = _this;
return this->hash;
}
static
void
hashValueHandleDouble(void * _this, void * _double)
{
TR_HashValue this = _this;
TR_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;
}
TR_INIT_IFACE(TR_Class, hashValueCtor, hashValueDtor, NULL);
TR_INIT_IFACE(TR_Hashable, hashValueGetHash, hashValueHandleDouble);
TR_CREATE_CLASS(TR_HashValue, NULL, TR_IF(TR_Class), TR_IF(TR_Hashable));
// vim: set ts=4 sw=4: