hash/value.c File Reference

#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include "class.h"
#include "utils/hash.h"
#include "utils/memory.h"
#include "commons.h"
#include "hash/value.h"
#include "hash/interface/hashable.h"

Include dependency graph for hash/value.c:

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Functions
static int	hashValueCtor (void *_this, va_list *params)
static void	hashValueDtor (void *_this)
static unsigned long	hashValueGetHash (void *_this)
static void	hashValueHandleDouble (void *_this, void *_double)
	INIT_IFACE (Class, hashValueCtor, hashValueDtor, NULL)
	INIT_IFACE (Hashable, hashValueGetHash, hashValueHandleDouble)
	CREATE_CLASS (HashValue, NULL, IFACE(Class), IFACE(Hashable))

Detailed Description

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/.

Definition in file hash/value.c.

Function Documentation

CREATE_CLASS	(	HashValue	,
		NULL	,
		IFACE(Class)	,
		IFACE(Hashable)
	)

static int hashValueCtor ( void *  _this, va_list *  params  )

static

Definition at line 38 of file hash/value.c.

References memMalloc(), and sdbm().

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

    return 0;
}

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static void hashValueDtor ( void *  _this )

static

Definition at line 65 of file hash/value.c.

References MEM_FREE.

{
    HashValue this = _this;

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

static unsigned long hashValueGetHash ( void *  _this )

static

Definition at line 75 of file hash/value.c.

{
    HashValue this = _this;

    return this->hash;
}

static void hashValueHandleDouble ( void *  _this, void *  _double  )

static

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 also

hash/add.c).

Definition at line 84 of file hash/value.c.

{
    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
	)