/* ***** 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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 * the provisions above, a recipient may use your version of this file under
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 *
 * ***** END LICENSE BLOCK ***** */

#ifndef _SECITEM_H_
#define _SECITEM_H_
/*
 * secitem.h - public data structures and prototypes for handling
 *	       SECItems
 *
 * $Id: secitem.h,v 1.6 2006/05/22 22:24:34 wtchang%redhat.com Exp $
 */

#include "plarena.h"
#include "plhash.h"
#include "seccomon.h"

SEC_BEGIN_PROTOS

/*
** Allocate an item.  If "arena" is not NULL, then allocate from there,
** otherwise allocate from the heap.  If "item" is not NULL, allocate
** only the data buffer for the item, not the item itself.  If "len" is
** 0, do not allocate the data buffer for the item; simply set the data
** field to NULL and the len field to 0.  The item structure is allocated
** zero-filled; the data buffer is not zeroed.  The caller is responsible
** for initializing the type field of the item.
**
** The resulting item is returned; NULL if any error occurs.
**
** XXX This probably should take a SECItemType, but since that is mostly
** unused and our improved APIs (aka Stan) are looming, I left it out.
*/
extern SECItem *SECITEM_AllocItem(PRArenaPool *arena, SECItem *item,
				  unsigned int len);

/*
** Reallocate the data for the specified "item".  If "arena" is not NULL,
** then reallocate from there, otherwise reallocate from the heap.
** In the case where oldlen is 0, the data is allocated (not reallocated).
** In any case, "item" is expected to be a valid SECItem pointer;
** SECFailure is returned if it is not.  If the allocation succeeds,
** SECSuccess is returned.
*/
extern SECStatus SECITEM_ReallocItem(PRArenaPool *arena, SECItem *item,
				     unsigned int oldlen, unsigned int newlen);

/*
** Compare two items returning the difference between them.
*/
extern SECComparison SECITEM_CompareItem(const SECItem *a, const SECItem *b);

/*
** Compare two items -- if they are the same, return true; otherwise false.
*/
extern PRBool SECITEM_ItemsAreEqual(const SECItem *a, const SECItem *b);

/*
** Copy "from" to "to"
*/
extern SECStatus SECITEM_CopyItem(PRArenaPool *arena, SECItem *to, 
                                  const SECItem *from);

/*
** Allocate an item and copy "from" into it.
*/
extern SECItem *SECITEM_DupItem(const SECItem *from);

/*
** Allocate an item and copy "from" into it.  The item itself and the 
** data it points to are both allocated from the arena.  If arena is
** NULL, this function is equivalent to SECITEM_DupItem.
*/
extern SECItem *SECITEM_ArenaDupItem(PRArenaPool *arena, const SECItem *from);

/*
** Free "zap". If freeit is PR_TRUE then "zap" itself is freed.
*/
extern void SECITEM_FreeItem(SECItem *zap, PRBool freeit);

/*
** Zero and then free "zap". If freeit is PR_TRUE then "zap" itself is freed.
*/
extern void SECITEM_ZfreeItem(SECItem *zap, PRBool freeit);

PLHashNumber PR_CALLBACK SECITEM_Hash ( const void *key);

PRIntn PR_CALLBACK SECITEM_HashCompare ( const void *k1, const void *k2);


SEC_END_PROTOS

#endif /* _SECITEM_H_ */
