mirror of
https://github.com/rn10950/RetroZilla.git
synced 2024-11-11 02:10:17 +01:00
486 lines
10 KiB
C
486 lines
10 KiB
C
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* Support routines for SECItem data structure.
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*/
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#include "seccomon.h"
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#include "secitem.h"
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#include "secerr.h"
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#include "secport.h"
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SECItem *
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SECITEM_AllocItem(PLArenaPool *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(PLArenaPool *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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SECStatus
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SECITEM_ReallocItemV2(PLArenaPool *arena, SECItem *item, unsigned int newlen)
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{
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unsigned char *newdata = NULL;
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PORT_Assert(item);
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if (!item) {
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PORT_SetError(SEC_ERROR_INVALID_ARGS);
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return SECFailure;
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}
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if (item->len == newlen) {
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return SECSuccess;
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}
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if (!newlen) {
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if (!arena) {
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PORT_Free(item->data);
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}
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item->data = NULL;
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item->len = 0;
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return SECSuccess;
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}
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if (!item->data) {
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/* allocate fresh block of memory */
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PORT_Assert(!item->len);
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if (arena) {
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newdata = PORT_ArenaAlloc(arena, newlen);
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} else {
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newdata = PORT_Alloc(newlen);
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}
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} else {
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/* reallocate or adjust existing block of memory */
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if (arena) {
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if (item->len > newlen) {
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/* There's no need to realloc a shorter block from the arena,
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* because it would result in using even more memory!
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* Therefore we'll continue to use the old block and
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* set the item to the shorter size.
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*/
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item->len = newlen;
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return SECSuccess;
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}
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newdata = PORT_ArenaGrow(arena, item->data, item->len, newlen);
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} else {
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newdata = PORT_Realloc(item->data, newlen);
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}
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}
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if (!newdata) {
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PORT_SetError(SEC_ERROR_NO_MEMORY);
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return SECFailure;
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}
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item->len = newlen;
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item->data = newdata;
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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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int 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 = PORT_Memcmp(a->data, b->data, m);
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if (rv) {
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return rv < 0 ? SECLessThan : SECGreaterThan;
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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(PLArenaPool *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(PLArenaPool *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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/*
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* If from->data is NULL but from->len is nonzero, this function
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* will succeed. Is this right?
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*/
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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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SECItemArray *
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SECITEM_AllocArray(PLArenaPool *arena, SECItemArray *array, unsigned int len)
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{
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SECItemArray *result = NULL;
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void *mark = NULL;
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if (array != NULL && array->items != NULL) {
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PORT_Assert(0);
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PORT_SetError(SEC_ERROR_INVALID_ARGS);
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return NULL;
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}
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if (arena != NULL) {
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mark = PORT_ArenaMark(arena);
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}
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if (array == NULL) {
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if (arena != NULL) {
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result = PORT_ArenaZAlloc(arena, sizeof(SECItemArray));
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} else {
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result = PORT_ZAlloc(sizeof(SECItemArray));
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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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result = array;
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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->items = PORT_ArenaZNewArray(arena, SECItem, len);
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} else {
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result->items = PORT_ZNewArray(SECItem, len);
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}
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if (result->items == NULL) {
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goto loser;
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}
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} else {
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result->items = 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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} else {
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if (result != NULL && array == NULL) {
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PORT_Free(result);
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}
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}
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if (array != NULL) {
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array->items = NULL;
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array->len = 0;
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}
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return NULL;
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}
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static void
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secitem_FreeArray(SECItemArray *array, PRBool zero_items, PRBool freeit)
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{
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unsigned int i;
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if (!array || !array->len || !array->items)
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return;
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for (i = 0; i < array->len; ++i) {
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SECItem *item = &array->items[i];
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if (item->data) {
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if (zero_items) {
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SECITEM_ZfreeItem(item, PR_FALSE);
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} else {
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SECITEM_FreeItem(item, PR_FALSE);
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}
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}
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}
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PORT_Free(array->items);
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array->items = NULL;
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array->len = 0;
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if (freeit)
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PORT_Free(array);
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}
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void SECITEM_FreeArray(SECItemArray *array, PRBool freeit)
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{
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secitem_FreeArray(array, PR_FALSE, freeit);
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}
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void SECITEM_ZfreeArray(SECItemArray *array, PRBool freeit)
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{
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secitem_FreeArray(array, PR_TRUE, freeit);
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}
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SECItemArray *
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SECITEM_DupArray(PLArenaPool *arena, const SECItemArray *from)
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{
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SECItemArray *result;
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unsigned int i;
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/* Require a "from" array.
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* Reject an inconsistent "from" array with NULL data and nonzero length.
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* However, allow a "from" array of zero length.
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*/
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if (!from || (!from->items && from->len))
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return NULL;
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result = SECITEM_AllocArray(arena, NULL, from->len);
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if (!result)
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return NULL;
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for (i = 0; i < from->len; ++i) {
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SECStatus rv = SECITEM_CopyItem(arena,
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&result->items[i], &from->items[i]);
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if (rv != SECSuccess) {
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SECITEM_ZfreeArray(result, PR_TRUE);
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return NULL;
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}
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}
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return result;
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}
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