389-ds-base/ldap/servers/slapd/back-ldbm/vlv_key.c

/** BEGIN COPYRIGHT BLOCK
 * 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; version 2 of the License.
 * 
 * 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, write to the Free Software Foundation, Inc., 59 Temple
 * Place, Suite 330, Boston, MA 02111-1307 USA.
 * 
 * In addition, as a special exception, Red Hat, Inc. gives You the additional
 * right to link the code of this Program with code not covered under the GNU
 * General Public License ("Non-GPL Code") and to distribute linked combinations
 * including the two, subject to the limitations in this paragraph. Non-GPL Code
 * permitted under this exception must only link to the code of this Program
 * through those well defined interfaces identified in the file named EXCEPTION
 * found in the source code files (the "Approved Interfaces"). The files of
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 * the GNU General Public License. Only Red Hat, Inc. may make changes or
 * additions to the list of Approved Interfaces. You must obey the GNU General
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 * in conjunction with the Program except the Non-GPL Code covered by this
 * exception. If you modify this file, you may extend this exception to your
 * version of the file, but you are not obligated to do so. If you do not wish to
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 * statement from your version and license this file solely under the GPL without
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 * Copyright (C) 2001 Sun Microsystems, Inc. Used by permission.
 * Copyright (C) 2005 Red Hat, Inc.
 * All rights reserved.
 * END COPYRIGHT BLOCK **/

#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

/* vlv_key.c */


#include "back-ldbm.h"
#include "vlv_key.h"

/*
 * These functions manipulate keys for the virtual list view indexes.
 * A key consists of a string of attribute values concatinated together,
 * plus an entry DN to ensure uniqueness.
 */

struct vlv_key *
vlv_key_new()
{
    struct vlv_key *p= (struct vlv_key*)slapi_ch_malloc(sizeof(struct vlv_key));
    p->keymem= 64;
    memset(&p->key,0,sizeof(DBT));
    p->key.data= slapi_ch_malloc(p->keymem);
    p->key.size= 0;
    return p;
}

void
vlv_key_delete(struct vlv_key **p)
{
    slapi_ch_free(&((*p)->key.data));
    slapi_ch_free((void **)p);
}

#if 0
static void
vlv_key_copy(const struct vlv_key *p1,struct vlv_key *p2)
{
    p2->keymem= p1->keymem;
    p2->key.data= slapi_ch_realloc(p2->key.data,p2->keymem);
    strcpy(p2->key.data, p1->key.data);
    p2->key.size= p1->key.size;
}
#endif

/*
 * Add an attribute value to the end of a composite key.
 */
void
vlv_key_addattr(struct vlv_key *p,struct berval *val)
{
    /* If there isn't room then allocate some more memory */
    unsigned int need = p->key.size + val->bv_len;
    if(need > p->keymem)
    {
        p->keymem*= 2;
        if(need > p->keymem)
        {
            p->keymem= need;
        }
        p->key.data= slapi_ch_realloc(p->key.data,p->keymem);
    }
    memcpy(((char*)p->key.data)+p->key.size, val->bv_val, val->bv_len);
    p->key.size+= val->bv_len;
}