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crypt32: Simplify CRYPT_AsnDecodeIntInternal.

This commit is contained in:
Juan Lang 2009-10-15 15:12:40 -07:00 committed by Alexandre Julliard
parent 685fe55f97
commit 4e300b6def
1 changed files with 15 additions and 13 deletions
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28
dlls/crypt32/decode.c
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@ -3915,38 +3915,40 @@ 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);
DWORD dataLen;
blob->pbData = buf + sizeof(CRYPT_INTEGER_BLOB);
ret = CRYPT_AsnDecodeIntegerInternal(pbEncoded, cbEncoded, 0, buf,
&size, pcbDecoded);
if (ret)
if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
{
if (!pvStructInfo)
BYTE lenBytes = GET_LEN_BYTES(pbEncoded[1]);
if (pcbDecoded)
*pcbDecoded = 1 + lenBytes + dataLen;
if (dataLen > sizeof(int))
{
SetLastError(CRYPT_E_ASN1_LARGE);
ret = FALSE;
}
else if (!pvStructInfo)
*pcbStructInfo = sizeof(int);
else if ((ret = CRYPT_DecodeCheckSpace(pcbStructInfo, sizeof(int))))
{
int val, i;
if (blob->pbData[blob->cbData - 1] & 0x80)
if (dataLen && pbEncoded[1 + lenBytes] & 0x80)
{
/* initialize to a negative value to sign-extend */
val = -1;
}
else
val = 0;
for (i = 0; i < blob->cbData; i++)
for (i = 0; i < dataLen; i++)
{
val <<= 8;
val |= blob->pbData[blob->cbData - i - 1];
val |= pbEncoded[1 + lenBytes + i];
}
memcpy(pvStructInfo, &val, sizeof(int));
}
}
else if (GetLastError() == ERROR_MORE_DATA)
SetLastError(CRYPT_E_ASN1_LARGE);
return ret;
}