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author | relyea%netscape.com <devnull@localhost> | 2000-03-31 20:13:40 +0000 |
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committer | relyea%netscape.com <devnull@localhost> | 2000-03-31 20:13:40 +0000 |
commit | 9502869e82d4f3ce26b292263e1c626dca3a34f3 (patch) | |
tree | 4d0f8ab157505b57c13a5e2bdf979560ab751527 /security/nss/lib/ckfw/hash.c | |
parent | 222a52dab759085f56dcb6588b69a6a937d82aa2 (diff) | |
download | nss-hg-9502869e82d4f3ce26b292263e1c626dca3a34f3.tar.gz |
Initial NSS Open Source checkin
Diffstat (limited to 'security/nss/lib/ckfw/hash.c')
-rw-r--r-- | security/nss/lib/ckfw/hash.c | 334 |
1 files changed, 334 insertions, 0 deletions
diff --git a/security/nss/lib/ckfw/hash.c b/security/nss/lib/ckfw/hash.c new file mode 100644 index 000000000..f9790493b --- /dev/null +++ b/security/nss/lib/ckfw/hash.c @@ -0,0 +1,334 @@ +/* + * 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 Netscape are + * Copyright (C) 1994-2000 Netscape Communications Corporation. All + * Rights Reserved. + * + * Contributor(s): + * + * Alternatively, the contents of this file may be used under the + * terms of the GNU General Public License Version 2 or later (the + * "GPL"), in which case the provisions of the GPL are applicable + * instead of those above. If you wish to allow use of your + * version of this file only under the terms of the GPL and not to + * allow others to use your version of this file under the MPL, + * indicate your decision by deleting the provisions above and + * replace them with the notice and other provisions required by + * the GPL. If you do not delete the provisions above, a recipient + * may use your version of this file under either the MPL or the + * GPL. + */ + +#ifdef DEBUG +static const char CVS_ID[] = "@(#) $RCSfile$ $Revision$ $Date$ $Name$"; +#endif /* DEBUG */ + +/* + * hash.c + * + * This is merely a couple wrappers around NSPR's PLHashTable, using + * the identity hash and arena-aware allocators. The reason I did + * this is that hash tables are used in a few places throughout the + * NSS Cryptoki Framework in a fairly stereotyped way, and this allows + * me to pull the commonalities into one place. Should we ever want + * to change the implementation, it's all right here. + */ + +#ifndef CK_T +#include "ck.h" +#endif /* CK_T */ + +/* + * nssCKFWHash + * + * nssCKFWHash_Create + * nssCKFWHash_Destroy + * nssCKFWHash_Add + * nssCKFWHash_Remove + * nssCKFWHash_Count + * nssCKFWHash_Exists + * nssCKFWHash_Lookup + * nssCKFWHash_Iterate + */ + +struct nssCKFWHashStr { + NSSCKFWMutex *mutex; + + /* + * The invariant that mutex protects is: + * The count accurately reflects the hashtable state. + */ + + PLHashTable *plHashTable; + CK_ULONG count; +}; + +static PLHashNumber +nss_ckfw_identity_hash +( + const void *key +) +{ + PRUint32 i = (PRUint32)key; + PR_ASSERT(sizeof(PLHashNumber) == sizeof(PRUint32)); + return (PLHashNumber)i; +} + +/* + * nssCKFWHash_Create + * + */ +NSS_IMPLEMENT nssCKFWHash * +nssCKFWHash_Create +( + NSSCKFWInstance *fwInstance, + NSSArena *arena, + CK_RV *pError +) +{ + nssCKFWHash *rv; + +#ifdef NSSDEBUG + if( (CK_RV *)NULL == pError ) { + return (nssCKFWHash *)NULL; + } + + if( PR_SUCCESS != nssArena_verifyPointer(arena) ) { + *pError = CKR_ARGUMENTS_BAD; + return (nssCKFWHash *)NULL; + } +#endif /* NSSDEBUG */ + + rv = nss_ZNEW(arena, nssCKFWHash); + if( (nssCKFWHash *)NULL == rv ) { + *pError = CKR_HOST_MEMORY; + return (nssCKFWHash *)NULL; + } + + rv->mutex = nssCKFWInstance_CreateMutex(fwInstance, arena, pError); + if( (NSSCKFWMutex *)NULL == rv->mutex ) { + if( CKR_OK == *pError ) { + *pError = CKR_GENERAL_ERROR; + } + return (nssCKFWHash *)NULL; + } + + rv->plHashTable = PL_NewHashTable(0, nss_ckfw_identity_hash, + PL_CompareValues, PL_CompareValues, &nssArenaHashAllocOps, arena); + if( (PLHashTable *)NULL == rv->plHashTable ) { + (void)nssCKFWMutex_Destroy(rv->mutex); + (void)nss_ZFreeIf(rv); + *pError = CKR_HOST_MEMORY; + return (nssCKFWHash *)NULL; + } + + rv->count = 0; + + return rv; +} + +/* + * nssCKFWHash_Destroy + * + */ +NSS_IMPLEMENT void +nssCKFWHash_Destroy +( + nssCKFWHash *hash +) +{ + (void)nssCKFWMutex_Destroy(hash->mutex); + PL_HashTableDestroy(hash->plHashTable); + (void)nss_ZFreeIf(hash); +} + +/* + * nssCKFWHash_Add + * + */ +NSS_IMPLEMENT CK_RV +nssCKFWHash_Add +( + nssCKFWHash *hash, + const void *key, + const void *value +) +{ + CK_RV error = CKR_OK; + PLHashEntry *he; + + error = nssCKFWMutex_Lock(hash->mutex); + if( CKR_OK != error ) { + return error; + } + + he = PL_HashTableAdd(hash->plHashTable, key, (void *)value); + if( (PLHashEntry *)NULL == he ) { + error = CKR_HOST_MEMORY; + } else { + hash->count++; + } + + (void)nssCKFWMutex_Unlock(hash->mutex); + + return error; +} + +/* + * nssCKFWHash_Remove + * + */ +NSS_IMPLEMENT void +nssCKFWHash_Remove +( + nssCKFWHash *hash, + const void *it +) +{ + PRBool found; + + if( CKR_OK != nssCKFWMutex_Lock(hash->mutex) ) { + return; + } + + found = PL_HashTableRemove(hash->plHashTable, it); + if( found ) { + hash->count--; + } + + (void)nssCKFWMutex_Unlock(hash->mutex); + return; +} + +/* + * nssCKFWHash_Count + * + */ +NSS_IMPLEMENT CK_ULONG +nssCKFWHash_Count +( + nssCKFWHash *hash +) +{ + CK_ULONG count; + + if( CKR_OK != nssCKFWMutex_Lock(hash->mutex) ) { + return (CK_ULONG)0; + } + + count = hash->count; + + (void)nssCKFWMutex_Unlock(hash->mutex); + + return count; +} + +/* + * nssCKFWHash_Exists + * + */ +NSS_IMPLEMENT CK_BBOOL +nssCKFWHash_Exists +( + nssCKFWHash *hash, + const void *it +) +{ + void *value; + + if( CKR_OK != nssCKFWMutex_Lock(hash->mutex) ) { + return CK_FALSE; + } + + value = PL_HashTableLookup(hash->plHashTable, it); + + (void)nssCKFWMutex_Unlock(hash->mutex); + + if( (void *)NULL == value ) { + return CK_FALSE; + } else { + return CK_TRUE; + } +} + +/* + * nssCKFWHash_Lookup + * + */ +NSS_IMPLEMENT void * +nssCKFWHash_Lookup +( + nssCKFWHash *hash, + const void *it +) +{ + void *rv; + + if( CKR_OK != nssCKFWMutex_Lock(hash->mutex) ) { + return (void *)NULL; + } + + rv = PL_HashTableLookup(hash->plHashTable, it); + + (void)nssCKFWMutex_Unlock(hash->mutex); + + return rv; +} + +struct arg_str { + nssCKFWHashIterator fcn; + void *closure; +}; + +static PRIntn +nss_ckfwhash_enumerator +( + PLHashEntry *he, + PRIntn index, + void *arg +) +{ + struct arg_str *as = (struct arg_str *)arg; + as->fcn(he->key, he->value, as->closure); + return HT_ENUMERATE_NEXT; +} + +/* + * nssCKFWHash_Iterate + * + * NOTE that the iteration function will be called with the hashtable locked. + */ +NSS_IMPLEMENT void +nssCKFWHash_Iterate +( + nssCKFWHash *hash, + nssCKFWHashIterator fcn, + void *closure +) +{ + struct arg_str as; + as.fcn = fcn; + as.closure = closure; + + if( CKR_OK != nssCKFWMutex_Lock(hash->mutex) ) { + return; + } + + PL_HashTableEnumerateEntries(hash->plHashTable, nss_ckfwhash_enumerator, &as); + + (void)nssCKFWMutex_Unlock(hash->mutex); + + return; +} |