crypto/ecc/secitem.c

/* BEGIN CSTYLED */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is the Netscape security libraries.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1994-2000
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * ***** END LICENSE BLOCK ***** */
/*
 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
 *
 * Sun elects to use this software under the MPL license.
 */

/*
 * Support routines for SECItem data structure.
 *
 * $Id: secitem.c,v 1.14 2006/05/22 22:24:34 wtchang%redhat.com Exp $
 */

#include <sys/types.h>
#include <sys/systm.h>
#include <sys/param.h>
#ifdef _KERNEL
#include <sys/kmem.h>
#else
#include <string.h>
#include <strings.h>
#include <assert.h>
#endif
#include "ec.h"
#include "ecl-curve.h"
#include "ecc_impl.h"

void SECITEM_FreeItem(SECItem *, PRBool);

SECItem *
SECITEM_AllocItem(PRArenaPool *arena, SECItem *item, unsigned int len,
    int kmflag)
{
    SECItem *result = NULL;
    void *mark = NULL;

    if (arena != NULL) {
    mark = PORT_ArenaMark(arena);
    }

    if (item == NULL) {
    if (arena != NULL) {
        result = PORT_ArenaZAlloc(arena, sizeof(SECItem), kmflag);
    } else {
        result = PORT_ZAlloc(sizeof(SECItem), kmflag);
    }
    if (result == NULL) {
        goto loser;
    }
    } else {
    PORT_Assert(item->data == NULL);
    result = item;
    }

    result->len = len;
    if (len) {
    if (arena != NULL) {
        result->data = PORT_ArenaAlloc(arena, len, kmflag);
    } else {
        result->data = PORT_Alloc(len, kmflag);
    }
    if (result->data == NULL) {
        goto loser;
    }
    } else {
    result->data = NULL;
    }

    if (mark) {
    PORT_ArenaUnmark(arena, mark);
    }
    return(result);

loser:
    if ( arena != NULL ) {
    if (mark) {
        PORT_ArenaRelease(arena, mark);
    }
    }
    SECITEM_FreeItem(result, (item == NULL) ? PR_TRUE : PR_FALSE);
    /*
     * If item is not NULL, the above also sets item->data and
     * item->len to 0.
     */
    return(NULL);
}

SECStatus
SECITEM_CopyItem(PRArenaPool *arena, SECItem *to, const SECItem *from,
   int kmflag)
{
    to->type = from->type;
    if (from->data && from->len) {
    if ( arena ) {
        to->data = (unsigned char*) PORT_ArenaAlloc(arena, from->len,
        kmflag);
    } else {
        to->data = (unsigned char*) PORT_Alloc(from->len, kmflag);
    }

    if (!to->data) {
        return SECFailure;
    }
    PORT_Memcpy(to->data, from->data, from->len);
    to->len = from->len;
    } else {
    to->data = 0;
    to->len = 0;
    }
    return SECSuccess;
}

void
SECITEM_FreeItem(SECItem *zap, PRBool freeit)
{
    if (zap) {
#ifdef _KERNEL
    kmem_free(zap->data, zap->len);
#else
    free(zap->data);
#endif
    zap->data = 0;
    zap->len = 0;
    if (freeit) {
#ifdef _KERNEL
        kmem_free(zap, sizeof (SECItem));
#else
        free(zap);
#endif
    }
    }
}
/* END CSTYLED */

void
SECITEM_ZfreeItem(SECItem *zap, PRBool freeit)
{
    if (zap) {
        PORT_ZFree(zap->data, zap->len);
        zap->data = 0;
        zap->len = 0;
        if (freeit) {
            PORT_ZFree(zap, sizeof (SECItem));
        }
    }
}