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325 lines
7.6 KiB
C
325 lines
7.6 KiB
C
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Netscape security libraries.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1994-2000
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/*
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* Support routines for SECItem data structure.
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*
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* $Id: secitem.c,v 1.15 2008/11/19 16:04:38 nelson%bolyard.com Exp $
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*/
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#include "seccomon.h"
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#include "secitem.h"
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#include "base64.h"
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#include "secerr.h"
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SECItem *
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SECITEM_AllocItem(PRArenaPool *arena, SECItem *item, unsigned int len)
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{
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SECItem *result = NULL;
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void *mark = NULL;
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if (arena != NULL) {
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mark = PORT_ArenaMark(arena);
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}
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if (item == NULL) {
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if (arena != NULL) {
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result = PORT_ArenaZAlloc(arena, sizeof(SECItem));
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} else {
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result = PORT_ZAlloc(sizeof(SECItem));
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}
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if (result == NULL) {
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goto loser;
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}
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} else {
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PORT_Assert(item->data == NULL);
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result = item;
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}
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result->len = len;
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if (len) {
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if (arena != NULL) {
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result->data = PORT_ArenaAlloc(arena, len);
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} else {
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result->data = PORT_Alloc(len);
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}
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if (result->data == NULL) {
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goto loser;
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}
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} else {
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result->data = NULL;
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}
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if (mark) {
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PORT_ArenaUnmark(arena, mark);
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}
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return(result);
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loser:
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if ( arena != NULL ) {
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if (mark) {
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PORT_ArenaRelease(arena, mark);
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}
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if (item != NULL) {
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item->data = NULL;
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item->len = 0;
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}
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} else {
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if (result != NULL) {
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SECITEM_FreeItem(result, (item == NULL) ? PR_TRUE : PR_FALSE);
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}
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/*
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* If item is not NULL, the above has set item->data and
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* item->len to 0.
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*/
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}
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return(NULL);
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}
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SECStatus
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SECITEM_ReallocItem(PRArenaPool *arena, SECItem *item, unsigned int oldlen,
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unsigned int newlen)
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{
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PORT_Assert(item != NULL);
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if (item == NULL) {
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/* XXX Set error. But to what? */
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return SECFailure;
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}
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/*
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* If no old length, degenerate to just plain alloc.
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*/
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if (oldlen == 0) {
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PORT_Assert(item->data == NULL || item->len == 0);
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if (newlen == 0) {
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/* Nothing to do. Weird, but not a failure. */
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return SECSuccess;
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}
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item->len = newlen;
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if (arena != NULL) {
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item->data = PORT_ArenaAlloc(arena, newlen);
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} else {
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item->data = PORT_Alloc(newlen);
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}
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} else {
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if (arena != NULL) {
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item->data = PORT_ArenaGrow(arena, item->data, oldlen, newlen);
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} else {
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item->data = PORT_Realloc(item->data, newlen);
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}
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}
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if (item->data == NULL) {
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return SECFailure;
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}
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return SECSuccess;
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}
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SECComparison
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SECITEM_CompareItem(const SECItem *a, const SECItem *b)
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{
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unsigned m;
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SECComparison rv;
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if (a == b)
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return SECEqual;
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if (!a || !a->len || !a->data)
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return (!b || !b->len || !b->data) ? SECEqual : SECLessThan;
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if (!b || !b->len || !b->data)
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return SECGreaterThan;
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m = ( ( a->len < b->len ) ? a->len : b->len );
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rv = (SECComparison) PORT_Memcmp(a->data, b->data, m);
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if (rv) {
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return rv;
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}
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if (a->len < b->len) {
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return SECLessThan;
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}
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if (a->len == b->len) {
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return SECEqual;
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}
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return SECGreaterThan;
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}
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PRBool
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SECITEM_ItemsAreEqual(const SECItem *a, const SECItem *b)
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{
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if (a->len != b->len)
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return PR_FALSE;
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if (!a->len)
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return PR_TRUE;
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if (!a->data || !b->data) {
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/* avoid null pointer crash. */
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return (PRBool)(a->data == b->data);
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}
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return (PRBool)!PORT_Memcmp(a->data, b->data, a->len);
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}
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SECItem *
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SECITEM_DupItem(const SECItem *from)
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{
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return SECITEM_ArenaDupItem(NULL, from);
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}
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SECItem *
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SECITEM_ArenaDupItem(PRArenaPool *arena, const SECItem *from)
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{
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SECItem *to;
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if ( from == NULL ) {
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return(NULL);
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}
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if ( arena != NULL ) {
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to = (SECItem *)PORT_ArenaAlloc(arena, sizeof(SECItem));
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} else {
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to = (SECItem *)PORT_Alloc(sizeof(SECItem));
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}
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if ( to == NULL ) {
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return(NULL);
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}
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if ( arena != NULL ) {
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to->data = (unsigned char *)PORT_ArenaAlloc(arena, from->len);
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} else {
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to->data = (unsigned char *)PORT_Alloc(from->len);
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}
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if ( to->data == NULL ) {
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PORT_Free(to);
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return(NULL);
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}
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to->len = from->len;
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to->type = from->type;
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if ( to->len ) {
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PORT_Memcpy(to->data, from->data, to->len);
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}
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return(to);
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}
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SECStatus
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SECITEM_CopyItem(PRArenaPool *arena, SECItem *to, const SECItem *from)
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{
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to->type = from->type;
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if (from->data && from->len) {
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if ( arena ) {
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to->data = (unsigned char*) PORT_ArenaAlloc(arena, from->len);
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} else {
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to->data = (unsigned char*) PORT_Alloc(from->len);
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}
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if (!to->data) {
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return SECFailure;
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}
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PORT_Memcpy(to->data, from->data, from->len);
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to->len = from->len;
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} else {
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to->data = 0;
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to->len = 0;
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}
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return SECSuccess;
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}
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void
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SECITEM_FreeItem(SECItem *zap, PRBool freeit)
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{
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if (zap) {
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PORT_Free(zap->data);
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zap->data = 0;
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zap->len = 0;
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if (freeit) {
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PORT_Free(zap);
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}
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}
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}
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void
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SECITEM_ZfreeItem(SECItem *zap, PRBool freeit)
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{
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if (zap) {
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PORT_ZFree(zap->data, zap->len);
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zap->data = 0;
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zap->len = 0;
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if (freeit) {
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PORT_ZFree(zap, sizeof(SECItem));
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}
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}
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}
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/* these reroutines were taken from pkix oid.c, which is supposed to
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* replace this file some day */
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/*
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* This is the hash function. We simply XOR the encoded form with
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* itself in sizeof(PLHashNumber)-byte chunks. Improving this
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* routine is left as an excercise for the more mathematically
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* inclined student.
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*/
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PLHashNumber PR_CALLBACK
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SECITEM_Hash ( const void *key)
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{
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const SECItem *item = (const SECItem *)key;
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PLHashNumber rv = 0;
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PRUint8 *data = (PRUint8 *)item->data;
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PRUint32 i;
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PRUint8 *rvc = (PRUint8 *)&rv;
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for( i = 0; i < item->len; i++ ) {
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rvc[ i % sizeof(rv) ] ^= *data;
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data++;
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}
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return rv;
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}
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/*
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* This is the key-compare function. It simply does a lexical
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* comparison on the item data. This does not result in
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* quite the same ordering as the "sequence of numbers" order,
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* but heck it's only used internally by the hash table anyway.
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*/
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PRIntn PR_CALLBACK
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SECITEM_HashCompare ( const void *k1, const void *k2)
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{
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const SECItem *i1 = (const SECItem *)k1;
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const SECItem *i2 = (const SECItem *)k2;
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return SECITEM_ItemsAreEqual(i1,i2);
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}
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