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crypt32: Don't assume a maximum of 32 valid usages.

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Juan Lang 2007-10-04 16:12:41 -07:00 committed by Alexandre Julliard
parent 9abd47ca7a
commit 75c13b8e5d
1 changed files with 41 additions and 3 deletions
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44
dlls/crypt32/cert.c
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@ -1922,6 +1922,42 @@ BOOL WINAPI CertRemoveEnhancedKeyUsageIdentifier(PCCERT_CONTEXT pCertContext,
return ret;
}
struct BitField
{
DWORD cIndexes;
DWORD *indexes;
};
#define BITS_PER_DWORD (sizeof(DWORD) * 8)
static void CRYPT_SetBitInField(struct BitField *field, DWORD bit)
{
DWORD indexIndex = bit / BITS_PER_DWORD;
if (indexIndex + 1 > field->cIndexes)
{
if (field->cIndexes)
field->indexes = CryptMemRealloc(field->indexes,
(indexIndex + 1) * sizeof(DWORD));
else
field->indexes = CryptMemAlloc(sizeof(DWORD));
if (field->indexes)
field->cIndexes = indexIndex + 1;
}
if (field->indexes)
field->indexes[indexIndex] |= 1 << (bit % BITS_PER_DWORD);
}
static BOOL CRYPT_IsBitInFieldSet(struct BitField *field, DWORD bit)
{
BOOL set = FALSE;
DWORD indexIndex = bit / BITS_PER_DWORD;
assert(field->cIndexes);
set = field->indexes[indexIndex] & (1 << (bit % BITS_PER_DWORD));
return set;
}
BOOL WINAPI CertGetValidUsages(DWORD cCerts, PCCERT_CONTEXT *rghCerts,
int *cNumOIDs, LPSTR *rghOIDs, DWORD *pcbOIDs)
{
@ -1978,7 +2014,8 @@ BOOL WINAPI CertGetValidUsages(DWORD cCerts, PCCERT_CONTEXT *rghCerts,
}
else
{
DWORD j, k, validIndexes = 0, numRemoved = 0;
struct BitField validIndexes = { 0, NULL };
DWORD j, k, numRemoved = 0;
/* Merge: build a bitmap of all the indexes of
* validUsages.rgpszUsageIdentifier that are in pUsage.
@ -1990,7 +2027,7 @@ BOOL WINAPI CertGetValidUsages(DWORD cCerts, PCCERT_CONTEXT *rghCerts,
if (!strcmp(pUsage->rgpszUsageIdentifier[j],
validUsages.rgpszUsageIdentifier[k]))
{
validIndexes |= (1 << k);
CRYPT_SetBitInField(&validIndexes, k);
break;
}
}
@ -2000,7 +2037,7 @@ BOOL WINAPI CertGetValidUsages(DWORD cCerts, PCCERT_CONTEXT *rghCerts,
*/
for (j = 0; j < validUsages.cUsageIdentifier; j++)
{
if (!(validIndexes & (1 << j)))
if (!CRYPT_IsBitInFieldSet(&validIndexes, j))
{
if (j < validUsages.cUsageIdentifier - 1)
{
@ -2019,6 +2056,7 @@ BOOL WINAPI CertGetValidUsages(DWORD cCerts, PCCERT_CONTEXT *rghCerts,
validUsages.cUsageIdentifier--;
}
}
CryptMemFree(validIndexes.indexes);
}
}
CryptMemFree(pUsage);