зеркало из https://github.com/mozilla/gecko-dev.git
338 строки
6.7 KiB
C
338 строки
6.7 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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#ifdef DEBUG
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static const char CVS_ID[] = "@(#) $RCSfile: hash.c,v $ $Revision: 1.3 $ $Date: 2005/01/20 02:25:45 $";
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#endif /* DEBUG */
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/*
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* hash.c
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*
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* This is merely a couple wrappers around NSPR's PLHashTable, using
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* the identity hash and arena-aware allocators. The reason I did
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* this is that hash tables are used in a few places throughout the
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* NSS Cryptoki Framework in a fairly stereotyped way, and this allows
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* me to pull the commonalities into one place. Should we ever want
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* to change the implementation, it's all right here.
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*/
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#ifndef CK_T
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#include "ck.h"
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#endif /* CK_T */
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/*
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* nssCKFWHash
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*
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* nssCKFWHash_Create
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* nssCKFWHash_Destroy
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* nssCKFWHash_Add
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* nssCKFWHash_Remove
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* nssCKFWHash_Count
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* nssCKFWHash_Exists
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* nssCKFWHash_Lookup
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* nssCKFWHash_Iterate
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*/
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struct nssCKFWHashStr {
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NSSCKFWMutex *mutex;
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/*
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* The invariant that mutex protects is:
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* The count accurately reflects the hashtable state.
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*/
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PLHashTable *plHashTable;
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CK_ULONG count;
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};
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static PLHashNumber
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nss_ckfw_identity_hash
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(
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const void *key
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)
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{
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PRUint32 i = (PRUint32)key;
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PR_ASSERT(sizeof(PLHashNumber) == sizeof(PRUint32));
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return (PLHashNumber)i;
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}
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/*
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* nssCKFWHash_Create
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*
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*/
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NSS_IMPLEMENT nssCKFWHash *
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nssCKFWHash_Create
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(
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NSSCKFWInstance *fwInstance,
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NSSArena *arena,
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CK_RV *pError
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)
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{
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nssCKFWHash *rv;
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#ifdef NSSDEBUG
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if( (CK_RV *)NULL == pError ) {
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return (nssCKFWHash *)NULL;
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}
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if( PR_SUCCESS != nssArena_verifyPointer(arena) ) {
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*pError = CKR_ARGUMENTS_BAD;
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return (nssCKFWHash *)NULL;
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}
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#endif /* NSSDEBUG */
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rv = nss_ZNEW(arena, nssCKFWHash);
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if( (nssCKFWHash *)NULL == rv ) {
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*pError = CKR_HOST_MEMORY;
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return (nssCKFWHash *)NULL;
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}
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rv->mutex = nssCKFWInstance_CreateMutex(fwInstance, arena, pError);
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if( (NSSCKFWMutex *)NULL == rv->mutex ) {
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if( CKR_OK == *pError ) {
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*pError = CKR_GENERAL_ERROR;
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}
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return (nssCKFWHash *)NULL;
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}
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rv->plHashTable = PL_NewHashTable(0, nss_ckfw_identity_hash,
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PL_CompareValues, PL_CompareValues, &nssArenaHashAllocOps, arena);
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if( (PLHashTable *)NULL == rv->plHashTable ) {
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(void)nssCKFWMutex_Destroy(rv->mutex);
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(void)nss_ZFreeIf(rv);
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*pError = CKR_HOST_MEMORY;
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return (nssCKFWHash *)NULL;
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}
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rv->count = 0;
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return rv;
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}
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/*
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* nssCKFWHash_Destroy
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*
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*/
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NSS_IMPLEMENT void
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nssCKFWHash_Destroy
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(
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nssCKFWHash *hash
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)
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{
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(void)nssCKFWMutex_Destroy(hash->mutex);
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PL_HashTableDestroy(hash->plHashTable);
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(void)nss_ZFreeIf(hash);
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}
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/*
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* nssCKFWHash_Add
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*
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*/
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NSS_IMPLEMENT CK_RV
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nssCKFWHash_Add
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(
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nssCKFWHash *hash,
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const void *key,
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const void *value
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)
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{
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CK_RV error = CKR_OK;
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PLHashEntry *he;
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error = nssCKFWMutex_Lock(hash->mutex);
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if( CKR_OK != error ) {
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return error;
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}
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he = PL_HashTableAdd(hash->plHashTable, key, (void *)value);
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if( (PLHashEntry *)NULL == he ) {
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error = CKR_HOST_MEMORY;
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} else {
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hash->count++;
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}
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(void)nssCKFWMutex_Unlock(hash->mutex);
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return error;
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}
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/*
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* nssCKFWHash_Remove
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*
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*/
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NSS_IMPLEMENT void
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nssCKFWHash_Remove
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(
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nssCKFWHash *hash,
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const void *it
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)
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{
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PRBool found;
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if( CKR_OK != nssCKFWMutex_Lock(hash->mutex) ) {
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return;
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}
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found = PL_HashTableRemove(hash->plHashTable, it);
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if( found ) {
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hash->count--;
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}
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(void)nssCKFWMutex_Unlock(hash->mutex);
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return;
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}
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/*
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* nssCKFWHash_Count
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*
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*/
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NSS_IMPLEMENT CK_ULONG
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nssCKFWHash_Count
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(
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nssCKFWHash *hash
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)
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{
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CK_ULONG count;
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if( CKR_OK != nssCKFWMutex_Lock(hash->mutex) ) {
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return (CK_ULONG)0;
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}
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count = hash->count;
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(void)nssCKFWMutex_Unlock(hash->mutex);
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return count;
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}
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/*
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* nssCKFWHash_Exists
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*
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*/
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NSS_IMPLEMENT CK_BBOOL
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nssCKFWHash_Exists
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(
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nssCKFWHash *hash,
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const void *it
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)
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{
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void *value;
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if( CKR_OK != nssCKFWMutex_Lock(hash->mutex) ) {
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return CK_FALSE;
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}
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value = PL_HashTableLookup(hash->plHashTable, it);
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(void)nssCKFWMutex_Unlock(hash->mutex);
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if( (void *)NULL == value ) {
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return CK_FALSE;
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} else {
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return CK_TRUE;
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}
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}
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/*
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* nssCKFWHash_Lookup
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*
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*/
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NSS_IMPLEMENT void *
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nssCKFWHash_Lookup
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(
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nssCKFWHash *hash,
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const void *it
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)
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{
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void *rv;
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if( CKR_OK != nssCKFWMutex_Lock(hash->mutex) ) {
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return (void *)NULL;
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}
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rv = PL_HashTableLookup(hash->plHashTable, it);
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(void)nssCKFWMutex_Unlock(hash->mutex);
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return rv;
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}
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struct arg_str {
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nssCKFWHashIterator fcn;
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void *closure;
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};
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static PRIntn
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nss_ckfwhash_enumerator
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(
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PLHashEntry *he,
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PRIntn index,
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void *arg
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)
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{
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struct arg_str *as = (struct arg_str *)arg;
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as->fcn(he->key, he->value, as->closure);
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return HT_ENUMERATE_NEXT;
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}
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/*
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* nssCKFWHash_Iterate
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*
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* NOTE that the iteration function will be called with the hashtable locked.
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*/
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NSS_IMPLEMENT void
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nssCKFWHash_Iterate
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(
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nssCKFWHash *hash,
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nssCKFWHashIterator fcn,
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void *closure
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)
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{
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struct arg_str as;
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as.fcn = fcn;
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as.closure = closure;
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if( CKR_OK != nssCKFWMutex_Lock(hash->mutex) ) {
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return;
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}
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PL_HashTableEnumerateEntries(hash->plHashTable, nss_ckfwhash_enumerator, &as);
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(void)nssCKFWMutex_Unlock(hash->mutex);
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return;
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}
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