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[NTOSKRNL]

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Patch by Aleksey Bragin (he's not aware yet!):
Also implement FsRtlIs*InExpression prologue in FsRtlIsDbcsInExpression (adapted from Aleksey's work on FsRtlIsNameInExpression)
Also added support for Dbcs chars in it

svn path=/trunk/; revision=58897
This commit is contained in:
Pierre Schweitzer 2013-05-01 09:10:34 +00:00
parent 93ce06d95e
commit 85c6b0f6b9
1 changed files with 60 additions and 2 deletions
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62
reactos/ntoskrnl/fsrtl/dbcsname.c
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@ -169,9 +169,67 @@ FsRtlIsDbcsInExpression(IN PANSI_STRING Expression,
ASSERT(Expression->Length);
ASSERT(!FsRtlDoesDbcsContainWildCards(Name));
if (Name->Length == 0)
/* Check if we were given strings at all */
if (!Name->Length || !Expression->Length)
{
return (Expression->Length == 0);
/* Return TRUE if both strings are empty, otherwise FALSE */
if (Name->Length == 0 && Expression->Length == 0)
return TRUE;
else
return FALSE;
}
/* Check for a shortcut: just one wildcard */
if (Expression->Length == sizeof(CHAR))
{
if (Expression->Buffer[0] == '*')
return TRUE;
}
//ASSERT(FsRtlDoesDbcsContainWildCards(Expression));
/* Another shortcut, wildcard followed by some string */
if (Expression->Buffer[0] == '*')
{
/* Copy Expression to our local variable */
ANSI_STRING IntExpression = *Expression;
/* Skip the first char */
IntExpression.Buffer++;
IntExpression.Length -= sizeof(CHAR);
/* Continue only if the rest of the expression does NOT contain
any more wildcards */
if (!FsRtlDoesDbcsContainWildCards(&IntExpression))
{
/* Check for a degenerate case */
if (Name->Length < (Expression->Length - sizeof(CHAR)))
return FALSE;
/* Calculate position */
NamePosition = (Name->Length - IntExpression.Length) / sizeof(CHAR);
/* Check whether we are breaking a two chars char (DBCS) */
if (NlsMbOemCodePageTag)
{
MatchingChars = 0;
while (MatchingChars < NamePosition)
{
/* Check if current char is DBCS lead char, if so, jump by two chars */
MatchingChars += FsRtlIsLeadDbcsCharacter(Name->Buffer[MatchingChars]) ? 2 : 1;
}
/* If so, deny */
if (MatchingChars > NamePosition)
return FALSE;
}
/* Compare */
return RtlEqualMemory(IntExpression.Buffer,
(Name->Buffer + NamePosition),
IntExpression.Length);
}
}
while (NamePosition < Name->Length && ExpressionPosition < Expression->Length)