IN BOOLEAN IgnoreCase,
IN PWCHAR UpcaseTable OPTIONAL)
{
- SHORT StarFound = -1;
- PUSHORT BackTracking = NULL;
+ SHORT StarFound = -1, DosStarFound = -1;
+ PUSHORT BackTracking = NULL, DosBackTracking = NULL;
UNICODE_STRING IntExpression;
- USHORT ExpressionPosition = 0, NamePosition = 0, MatchingChars;
+ USHORT ExpressionPosition = 0, NamePosition = 0, MatchingChars, LastDot;
WCHAR CompareChar;
- BOOLEAN BeyondName;
PAGED_CODE();
/* Check if we were given strings at all */
/* Check DOS_STAR */
else if (Expression->Buffer[ExpressionPosition] == DOS_STAR)
{
- /* We can only consume dot if that's not the last one
- * Otherwise, we null match
- */
- if (Name->Buffer[NamePosition] == L'.')
+ /* Skip contigous stars */
+ while ((ExpressionPosition + 1 < (USHORT)(Expression->Length / sizeof(WCHAR))) &&
+ (Expression->Buffer[ExpressionPosition + 1] == DOS_STAR))
+ {
+ ExpressionPosition++;
+ }
+
+ /* Look for last dot */
+ MatchingChars = 0;
+ LastDot = (USHORT)-1;
+ while (MatchingChars < Name->Length / sizeof(WCHAR))
{
- MatchingChars = NamePosition + 1;
- while (MatchingChars < Name->Length / sizeof(WCHAR))
+ if (Name->Buffer[MatchingChars] == L'.')
{
- if (Name->Buffer[MatchingChars] == L'.')
- {
- NamePosition++;
+ LastDot = MatchingChars;
+ if (LastDot > NamePosition)
break;
- }
- MatchingChars++;
}
- /* In case we were already at last dot, simply accept it */
- if (MatchingChars == Name->Length / sizeof(WCHAR))
- {
+ MatchingChars++;
+ }
+
+ /* If we don't have dots or we didn't find last yet
+ * start eating everything
+ */
+ if (MatchingChars != Name->Length || LastDot == (USHORT)-1)
+ {
+ if (!DosBackTracking) DosBackTracking = ExAllocatePoolWithTag(PagedPool | POOL_RAISE_IF_ALLOCATION_FAILURE,
+ (Expression->Length / sizeof(WCHAR)) * sizeof(USHORT),
+ 'nrSF');
+ DosBackTracking[++DosStarFound] = ExpressionPosition++;
+
+ /* Not the same char, start exploring */
+ if (Expression->Buffer[ExpressionPosition] != Name->Buffer[NamePosition])
NamePosition++;
- }
}
else
{
- /* XXX: Eat everything till the end */
- if (ExpressionPosition + 1 == Expression->Length / sizeof(WCHAR))
- {
- NamePosition = Name->Length;
- }
+ /* Else, if we are at last dot, eat it - otherwise, null match */
+ if (Name->Buffer[NamePosition] == '.')
+ NamePosition++;
- /* Try to eat till the next matching char or . */
- MatchingChars = NamePosition;
- while (MatchingChars < Name->Length / sizeof(WCHAR))
- {
- if (ExpressionPosition + 1 < Expression->Length / sizeof(WCHAR) &&
- Name->Buffer[MatchingChars] == Expression->Buffer[ExpressionPosition + 1])
- {
- NamePosition = MatchingChars;
- break;
- }
- else if (Name->Buffer[MatchingChars] == L'.')
- {
- NamePosition = MatchingChars + 1;
- break;
- }
- MatchingChars++;
- }
+ ExpressionPosition++;
}
- ExpressionPosition++;
}
/* Check DOS_DOT */
else if (Expression->Buffer[ExpressionPosition] == DOS_DOT)
{
- /* First try to find whether we are beyond last dot (beyond name) */
- BeyondName = TRUE;
- MatchingChars = NamePosition + 1;
- while (MatchingChars < Name->Length / sizeof(WCHAR))
- {
- if (Name->Buffer[MatchingChars] == L'.')
- {
- BeyondName = FALSE;
- break;
- }
- MatchingChars++;
- }
-
- /* If we are beyond name, we null match */
- if (BeyondName)
- {
- if (Name->Buffer[NamePosition] == L'.')
- {
- NamePosition++;
- }
- ExpressionPosition++;
- continue;
- }
- /* If not, we only match a dot */
- else if (Name->Buffer[NamePosition] == L'.')
+ /* We only match dots */
+ if (Name->Buffer[NamePosition] == L'.')
{
NamePosition++;
- ExpressionPosition++;
- continue;
}
- /* Otherwise, fail */
- else
+ /* Try to explore later on for null matching */
+ else if ((ExpressionPosition + 1 < (USHORT)(Expression->Length / sizeof(WCHAR))) &&
+ (Name->Buffer[NamePosition] == Expression->Buffer[ExpressionPosition + 1]))
{
- break;
+ NamePosition++;
}
+ ExpressionPosition++;
}
/* Check DOS_QM */
else if (Expression->Buffer[ExpressionPosition] == DOS_QM)
{
- /* Check whether we are upon a dot */
- MatchingChars = 0;
- while (MatchingChars < NamePosition)
- {
- if (Name->Buffer[MatchingChars] == L'.')
- {
- break;
- }
- MatchingChars++;
- }
-
- /* If not, we match a single char */
- if (MatchingChars == NamePosition && Name->Buffer[NamePosition] != L'.')
+ /* We match everything except dots */
+ if (Name->Buffer[NamePosition] != L'.')
{
NamePosition++;
- ExpressionPosition++;
- }
- else
- {
- /* If we are, we just go through QMs */
- while (ExpressionPosition < Expression->Length / sizeof(WCHAR) &&
- Expression->Buffer[ExpressionPosition] == DOS_QM)
- {
- ExpressionPosition++;
- }
}
+ ExpressionPosition++;
}
/* If nothing match, try to backtrack */
else if (StarFound >= 0)
{
ExpressionPosition = BackTracking[StarFound--];
}
+ else if (DosStarFound >= 0)
+ {
+ ExpressionPosition = DosBackTracking[DosStarFound--];
+ }
/* Otherwise, fail */
else
{
{
ExFreePoolWithTag(BackTracking, 'nrSF');
}
+ if (DosBackTracking)
+ {
+ ExFreePoolWithTag(DosBackTracking, 'nrSF');
+ }
return (ExpressionPosition == Expression->Length / sizeof(WCHAR) && NamePosition == Name->Length / sizeof(WCHAR));
}