Method MatchesFilter

PeaceMaker Kernel/StringFilters.cpp:254–315

Check if a string contains any filtered phrases. @param StrToCmp - The string to search. @param OperationFlag - Specify FILTER_FLAG_X's to match certain filters for a variety of operations. @return Whether or not there was a filter that matched. */

	@return Whether or not there was a filter that matched.
*/
BOOLEAN
StringFilters::MatchesFilter (
	_In_ WCHAR* StrToCmp,
	_In_ ULONG OperationFlag
	)
{
	BOOLEAN filterMatched;
	PFILTER_INFO_LINKED currentFilter;
	WCHAR tempStrToCmp[MAX_PATH];
	INT i;

	if (this == NULL || this->destroying)
	{
		return FALSE;
	}

	filterMatched = FALSE;

	//
	// Copy the string to compare so we don't modify the original string.
	//
	wcsncpy_s(tempStrToCmp, StrToCmp, MAX_PATH);

	//
	// Make the input string lowercase.
	//
	i = 0;
	while (tempStrToCmp[i])
	{
		tempStrToCmp[i] = towlower(tempStrToCmp[i]);
		i++;
	}

	//
	// Acquire a shared lock to iterate filters.
	//
	FltAcquirePushLockShared(&this->filtersLock);

	//
	// Iterate filters for a match.
	//
	if (this->filtersHead)
	{
		currentFilter = RCAST<PFILTER_INFO_LINKED>(this->filtersHead->ListEntry.Flink);
		while (currentFilter && currentFilter != this->filtersHead)
		{
			//
			// Check if the string to compare contains the filter.
			//
			if ((currentFilter->Filter.Flags & OperationFlag) &&
				(wcsstr(RCAST<CONST WCHAR*>(&tempStrToCmp), RCAST<CONST WCHAR*>(&currentFilter->Filter.MatchString)) != NULL))
			{
				filterMatched = TRUE;
				goto Exit;
			}
			currentFilter = RCAST<PFILTER_INFO_LINKED>(currentFilter->ListEntry.Flink);
		}
	}