hash_method.c

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/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1999, 2000
 *      Sleepycat Software.  All rights reserved.
 */

#include "config.h"

#ifndef lint
static const char revid[] = "$Id: hash__method_8c-source.html,v 1.1 2008/06/08 10:19:33 sebdiaz Exp $";
#endif /* not lint */

#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#endif

#include "db_int.h"
#include "db_page.h"
#include "hash.h"

static int __ham_set_h_ffactor __P((DB *, u_int32_t));
static int __ham_set_h_hash __P((DB *, u_int32_t(*)(const void *, u_int32_t)));
static int __ham_set_h_nelem __P((DB *, u_int32_t));

/*
 * CDB___ham_db_create --
 *      Hash specific initialization of the DB structure.
 *
 * PUBLIC: int CDB___ham_db_create __P((DB *));
 */
int
CDB___ham_db_create(dbp)
        DB *dbp;
{
        HASH *hashp;
        int ret;

        if ((ret = CDB___os_malloc(dbp->dbenv,
            sizeof(HASH), NULL, &dbp->h_internal)) != 0)
                return (ret);

        hashp = dbp->h_internal;

        hashp->h_nelem = 0;                     /* Defaults. */
        hashp->h_ffactor = 0;
        hashp->h_hash = NULL;

        dbp->set_h_ffactor = __ham_set_h_ffactor;
        dbp->set_h_hash = __ham_set_h_hash;
        dbp->set_h_nelem = __ham_set_h_nelem;

        return (0);
}

/*
 * PUBLIC: int CDB___ham_db_close __P((DB *));
 */
int
CDB___ham_db_close(dbp)
        DB *dbp;
{
        if (dbp->h_internal == NULL)
                return (0);
        CDB___os_free(dbp->h_internal, sizeof(HASH));
        dbp->h_internal = NULL;
        return (0);
}

/*
 * __ham_set_h_ffactor --
 *      Set the fill factor.
 */
static int
__ham_set_h_ffactor(dbp, h_ffactor)
        DB *dbp;
        u_int32_t h_ffactor;
{
        HASH *hashp;

        DB_ILLEGAL_AFTER_OPEN(dbp, "set_h_ffactor");
        DB_ILLEGAL_METHOD(dbp, DB_OK_HASH);

        hashp = dbp->h_internal;
        hashp->h_ffactor = h_ffactor;
        return (0);
}

/*
 * __ham_set_h_hash --
 *      Set the hash function.
 */
static int
__ham_set_h_hash(dbp, func)
        DB *dbp;
        u_int32_t (*func) __P((const void *, u_int32_t));
{
        HASH *hashp;

        DB_ILLEGAL_AFTER_OPEN(dbp, "set_h_hash");
        DB_ILLEGAL_METHOD(dbp, DB_OK_HASH);

        hashp = dbp->h_internal;
        hashp->h_hash = func;
        return (0);
}

/*
 * __ham_set_h_nelem --
 *      Set the table size.
 */
static int
__ham_set_h_nelem(dbp, h_nelem)
        DB *dbp;
        u_int32_t h_nelem;
{
        HASH *hashp;

        DB_ILLEGAL_AFTER_OPEN(dbp, "set_h_nelem");
        DB_ILLEGAL_METHOD(dbp, DB_OK_HASH);

        hashp = dbp->h_internal;
        hashp->h_nelem = h_nelem;
        return (0);
}

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