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crypt32: Separate DecodeInt into an internal and external version.

This commit is contained in:
Juan Lang 2007-09-17 17:03:28 -07:00 committed by Alexandre Julliard
parent a538e95c1d
commit 5fbca384e4
1 changed files with 56 additions and 37 deletions
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93
dlls/crypt32/decode.c
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@ -3034,59 +3034,78 @@ static BOOL WINAPI CRYPT_AsnDecodeBits(DWORD dwCertEncodingType,
return ret;
}
static BOOL CRYPT_AsnDecodeIntInternal(const BYTE *pbEncoded, DWORD cbEncoded,
DWORD dwFlags, void *pvStructInfo, DWORD *pcbStructInfo, DWORD *pcbDecoded)
{
BOOL ret;
BYTE buf[sizeof(CRYPT_INTEGER_BLOB) + sizeof(int)];
CRYPT_INTEGER_BLOB *blob = (CRYPT_INTEGER_BLOB *)buf;
DWORD size = sizeof(buf);
blob->pbData = buf + sizeof(CRYPT_INTEGER_BLOB);
if (pbEncoded[0] != ASN_INTEGER)
{
SetLastError(CRYPT_E_ASN1_BADTAG);
ret = FALSE;
}
else
ret = CRYPT_AsnDecodeIntegerInternal(X509_ASN_ENCODING, NULL,
pbEncoded, cbEncoded, 0, NULL, &buf, &size);
if (ret)
{
if (!pvStructInfo)
*pcbStructInfo = sizeof(int);
else if ((ret = CRYPT_DecodeEnsureSpace(dwFlags, NULL,
pvStructInfo, pcbStructInfo, sizeof(int))))
{
int val, i;
if (blob->pbData[blob->cbData - 1] & 0x80)
{
/* initialize to a negative value to sign-extend */
val = -1;
}
else
val = 0;
for (i = 0; i < blob->cbData; i++)
{
val <<= 8;
val |= blob->pbData[blob->cbData - i - 1];
}
memcpy(pvStructInfo, &val, sizeof(int));
}
}
else if (GetLastError() == ERROR_MORE_DATA)
SetLastError(CRYPT_E_ASN1_LARGE);
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeInt(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
if (!pvStructInfo)
{
*pcbStructInfo = sizeof(int);
return TRUE;
}
__TRY
{
BYTE buf[sizeof(CRYPT_INTEGER_BLOB) + sizeof(int)];
CRYPT_INTEGER_BLOB *blob = (CRYPT_INTEGER_BLOB *)buf;
DWORD size = sizeof(buf);
DWORD bytesNeeded;
blob->pbData = buf + sizeof(CRYPT_INTEGER_BLOB);
if (pbEncoded[0] != ASN_INTEGER)
{
SetLastError(CRYPT_E_ASN1_BADTAG);
ret = FALSE;
}
else
ret = CRYPT_AsnDecodeIntegerInternal(dwCertEncodingType,
X509_MULTI_BYTE_INTEGER, pbEncoded, cbEncoded, 0, NULL, &buf,
&size);
ret = CRYPT_AsnDecodeIntInternal(pbEncoded, cbEncoded,
dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL, &bytesNeeded, NULL);
if (ret)
{
if ((ret = CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara,
pvStructInfo, pcbStructInfo, sizeof(int))))
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if ((ret = CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara,
pvStructInfo, pcbStructInfo, bytesNeeded)))
{
int val, i;
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
pvStructInfo = *(BYTE **)pvStructInfo;
if (blob->pbData[blob->cbData - 1] & 0x80)
{
/* initialize to a negative value to sign-extend */
val = -1;
}
else
val = 0;
for (i = 0; i < blob->cbData; i++)
{
val <<= 8;
val |= blob->pbData[blob->cbData - i - 1];
}
memcpy(pvStructInfo, &val, sizeof(int));
ret = CRYPT_AsnDecodeIntInternal(pbEncoded, cbEncoded,
dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, pvStructInfo,
&bytesNeeded, NULL);
}
}
else if (GetLastError() == ERROR_MORE_DATA)
SetLastError(CRYPT_E_ASN1_LARGE);
}
__EXCEPT_PAGE_FAULT
{