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https://github.com/reactos/reactos.git
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652 lines
20 KiB
C
652 lines
20 KiB
C
/*
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* PROJECT: ReactOS Kernel
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* LICENSE: GPL - See COPYING in the top level directory
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* FILE: ntoskrnl/fsrtl/name.c
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* PURPOSE: Provides DBCS parsing and other support routines for FSDs
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* PROGRAMMERS: Alex Ionescu (alex.ionescu@reactos.org)
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* Pierre Schweitzer (pierre.schweitzer@reactos.org)
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*/
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/* INCLUDES ******************************************************************/
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#include <ntoskrnl.h>
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#define NDEBUG
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#include <debug.h>
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/* PUBLIC FUNCTIONS **********************************************************/
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/*++
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* @name FsRtlDissectDbcs
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* @implemented
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*
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* Dissects a given path name into first and remaining part.
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*
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* @param Name
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* ANSI string to dissect.
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*
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* @param FirstPart
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* Pointer to user supplied ANSI_STRING, that will later point
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* to the first part of the original name.
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*
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* @param RemainingPart
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* Pointer to user supplied ANSI_STRING, that will later point
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* to the remaining part of the original name.
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*
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* @return None
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*
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* @remarks Example:
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* Name: \test1\test2\test3
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* FirstPart: test1
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* RemainingPart: test2\test3
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*
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*--*/
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VOID
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NTAPI
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FsRtlDissectDbcs(IN ANSI_STRING Name,
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OUT PANSI_STRING FirstPart,
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OUT PANSI_STRING RemainingPart)
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{
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USHORT FirstPosition, i;
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USHORT SkipFirstSlash = 0;
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PAGED_CODE();
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/* Zero the strings before continuing */
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RtlZeroMemory(FirstPart, sizeof(ANSI_STRING));
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RtlZeroMemory(RemainingPart, sizeof(ANSI_STRING));
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/* Just quit if the string is empty */
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if (!Name.Length) return;
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/* Find first backslash */
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FirstPosition = Name.Length;
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for (i = 0; i < Name.Length; i++)
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{
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/* First make sure the character it's not the Lead DBCS */
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if (FsRtlIsLeadDbcsCharacter(Name.Buffer[i]))
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{
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i++;
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}
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/* If we found one... */
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else if (Name.Buffer[i] == '\\')
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{
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/* If it begins string, just notice it and continue */
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if (i == 0)
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{
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SkipFirstSlash = 1;
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}
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else
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{
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/* Else, save its position and break out of the loop */
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FirstPosition = i;
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break;
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}
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}
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}
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/* Set up the first result string */
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FirstPart->Buffer = Name.Buffer + SkipFirstSlash;
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FirstPart->Length = (FirstPosition - SkipFirstSlash);
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FirstPart->MaximumLength = FirstPart->Length;
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/* And second one, if necessary */
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if (FirstPosition < (Name.Length))
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{
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RemainingPart->Buffer = Name.Buffer + FirstPosition + 1;
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RemainingPart->Length = Name.Length - (FirstPosition + 1);
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RemainingPart->MaximumLength = RemainingPart->Length;
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}
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}
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/*++
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* @name FsRtlDoesDbcsContainWildCards
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* @implemented
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*
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* Returns TRUE if the given DbcsName contains wildcards such as *, ?,
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* ANSI_DOS_STAR, ANSI_DOS_DOT, and ANSI_DOS_QM
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*
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* @param Name
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* The Name to check
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*
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* @return TRUE if there are wildcards, FALSE otherwise
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*
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* @remarks None
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*
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*--*/
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BOOLEAN
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NTAPI
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FsRtlDoesDbcsContainWildCards(IN PANSI_STRING Name)
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{
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USHORT i;
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PAGED_CODE();
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/* Check every character */
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for (i = 0; i < Name->Length; i++)
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{
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/* First make sure it's not the Lead DBCS */
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if (FsRtlIsLeadDbcsCharacter(Name->Buffer[i]))
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{
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i++;
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}
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else if (FsRtlIsAnsiCharacterWild(Name->Buffer[i]))
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{
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/* Now return if it has a wildcard */
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return TRUE;
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}
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}
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/* We didn't return above...so none found */
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return FALSE;
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}
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/*++
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* @name FsRtlIsDbcsInExpression
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* @implemented
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*
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* Check if the Name string is in the Expression string.
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*
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* @param Expression
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* The string in which we've to find Name. It can contains wildcards
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*
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* @param Name
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* The string to find. It cannot contain wildcards.
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*
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* @return TRUE if Name is found in Expression, FALSE otherwise
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*
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* @remarks
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*
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*--*/
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BOOLEAN
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NTAPI
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FsRtlIsDbcsInExpression(IN PANSI_STRING Expression,
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IN PANSI_STRING Name)
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{
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SHORT StarFound = -1, DosStarFound = -1;
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PUSHORT BackTracking = NULL, DosBackTracking = NULL;
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USHORT ExpressionPosition = 0, NamePosition = 0, MatchingChars, LastDot;
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PAGED_CODE();
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ASSERT(Name->Length);
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ASSERT(Expression->Length);
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ASSERT(!FsRtlDoesDbcsContainWildCards(Name));
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/* Check if we were given strings at all */
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if (!Name->Length || !Expression->Length)
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{
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/* Return TRUE if both strings are empty, otherwise FALSE */
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if (Name->Length == 0 && Expression->Length == 0)
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return TRUE;
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else
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return FALSE;
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}
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/* Check for a shortcut: just one wildcard */
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if (Expression->Length == sizeof(CHAR))
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{
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if (Expression->Buffer[0] == '*')
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return TRUE;
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}
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//ASSERT(FsRtlDoesDbcsContainWildCards(Expression));
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/* Another shortcut, wildcard followed by some string */
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if (Expression->Buffer[0] == '*')
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{
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/* Copy Expression to our local variable */
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ANSI_STRING IntExpression = *Expression;
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/* Skip the first char */
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IntExpression.Buffer++;
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IntExpression.Length -= sizeof(CHAR);
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/* Continue only if the rest of the expression does NOT contain
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any more wildcards */
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if (!FsRtlDoesDbcsContainWildCards(&IntExpression))
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{
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/* Check for a degenerate case */
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if (Name->Length < (Expression->Length - sizeof(CHAR)))
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return FALSE;
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/* Calculate position */
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NamePosition = (Name->Length - IntExpression.Length) / sizeof(CHAR);
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/* Check whether we are breaking a two chars char (DBCS) */
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if (NlsMbOemCodePageTag)
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{
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MatchingChars = 0;
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while (MatchingChars < NamePosition)
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{
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/* Check if current char is DBCS lead char, if so, jump by two chars */
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MatchingChars += FsRtlIsLeadDbcsCharacter(Name->Buffer[MatchingChars]) ? 2 : 1;
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}
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/* If so, deny */
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if (MatchingChars > NamePosition)
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return FALSE;
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}
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/* Compare */
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return RtlEqualMemory(IntExpression.Buffer,
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(Name->Buffer + NamePosition),
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IntExpression.Length);
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}
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}
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while (NamePosition < Name->Length && ExpressionPosition < Expression->Length)
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{
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/* Basic check to test if chars are equal */
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if ((Expression->Buffer[ExpressionPosition] == Name->Buffer[NamePosition]))
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{
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NamePosition++;
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ExpressionPosition++;
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}
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/* Check cases that eat one char */
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else if (Expression->Buffer[ExpressionPosition] == '?')
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{
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NamePosition++;
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ExpressionPosition++;
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}
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/* Test star */
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else if (Expression->Buffer[ExpressionPosition] == '*')
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{
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/* Skip contigous stars */
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while (ExpressionPosition + 1 < Expression->Length && Expression->Buffer[ExpressionPosition + 1] == '*')
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{
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ExpressionPosition++;
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}
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/* Save star position */
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if (!BackTracking)
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{
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BackTracking = ExAllocatePoolWithTag(PagedPool | POOL_RAISE_IF_ALLOCATION_FAILURE,
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Expression->Length * sizeof(USHORT), 'nrSF');
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}
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BackTracking[++StarFound] = ExpressionPosition++;
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/* If star is at the end, then eat all rest and leave */
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if (ExpressionPosition == Expression->Length)
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{
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NamePosition = Name->Length;
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break;
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}
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/* Allow null matching */
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else if (Expression->Buffer[ExpressionPosition] != '?' &&
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Expression->Buffer[ExpressionPosition] != Name->Buffer[NamePosition])
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{
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NamePosition++;
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}
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}
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/* Check DOS_STAR */
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else if (Expression->Buffer[ExpressionPosition] == ANSI_DOS_STAR)
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{
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/* Skip contigous stars */
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while (ExpressionPosition + 1 < Expression->Length && Expression->Buffer[ExpressionPosition + 1] == ANSI_DOS_STAR)
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{
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ExpressionPosition++;
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}
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/* Look for last dot */
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MatchingChars = 0;
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LastDot = (USHORT)-1;
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while (MatchingChars < Name->Length)
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{
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if (Name->Buffer[MatchingChars] == '.')
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{
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LastDot = MatchingChars;
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if (LastDot > NamePosition)
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break;
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}
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MatchingChars++;
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}
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/* If we don't have dots or we didn't find last yet
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* start eating everything
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*/
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if (MatchingChars != Name->Length || LastDot == (USHORT)-1)
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{
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if (!DosBackTracking) DosBackTracking = ExAllocatePoolWithTag(PagedPool | POOL_RAISE_IF_ALLOCATION_FAILURE,
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Expression->Length * sizeof(USHORT), 'nrSF');
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DosBackTracking[++DosStarFound] = ExpressionPosition++;
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/* Not the same char, start exploring */
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if (Expression->Buffer[ExpressionPosition] != Name->Buffer[NamePosition])
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NamePosition++;
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}
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else
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{
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/* Else, if we are at last dot, eat it - otherwise, null match */
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if (Name->Buffer[NamePosition] == '.')
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NamePosition++;
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ExpressionPosition++;
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}
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}
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/* Check DOS_DOT */
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else if (Expression->Buffer[ExpressionPosition] == ANSI_DOS_DOT)
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{
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/* We only match dots */
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if (Name->Buffer[NamePosition] == '.')
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{
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NamePosition++;
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}
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/* Try to explore later on for null matching */
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else if (ExpressionPosition + 1 < Expression->Length &&
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Name->Buffer[NamePosition] == Expression->Buffer[ExpressionPosition + 1])
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{
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NamePosition++;
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}
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ExpressionPosition++;
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}
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/* Check DOS_QM */
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else if (Expression->Buffer[ExpressionPosition] == ANSI_DOS_QM)
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{
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/* We match everything except dots */
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if (Name->Buffer[NamePosition] != '.')
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{
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NamePosition++;
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}
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ExpressionPosition++;
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}
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/* If nothing match, try to backtrack */
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else if (StarFound >= 0)
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{
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ExpressionPosition = BackTracking[StarFound--];
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}
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else if (DosStarFound >= 0)
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{
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ExpressionPosition = DosBackTracking[DosStarFound--];
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}
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/* Otherwise, fail */
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else
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{
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break;
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}
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/* Under certain circumstances, expression is over, but name isn't
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* and we can backtrack, then, backtrack */
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if (ExpressionPosition == Expression->Length &&
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NamePosition != Name->Length && StarFound >= 0)
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{
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ExpressionPosition = BackTracking[StarFound--];
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}
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}
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/* If we have nullable matching wc at the end of the string, eat them */
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if (ExpressionPosition != Expression->Length && NamePosition == Name->Length)
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{
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while (ExpressionPosition < Expression->Length)
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{
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if (Expression->Buffer[ExpressionPosition] != ANSI_DOS_DOT &&
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Expression->Buffer[ExpressionPosition] != '*' &&
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Expression->Buffer[ExpressionPosition] != ANSI_DOS_STAR)
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{
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break;
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}
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ExpressionPosition++;
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}
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}
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if (BackTracking)
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{
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ExFreePoolWithTag(BackTracking, 'nrSF');
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}
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if (DosBackTracking)
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{
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ExFreePoolWithTag(DosBackTracking, 'nrSF');
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}
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return (ExpressionPosition == Expression->Length && NamePosition == Name->Length);
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}
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/*++
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* @name FsRtlIsFatDbcsLegal
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* @implemented
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*
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* Returns TRUE if the given DbcsName is a valid FAT filename (in 8.3)
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*
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* @param DbcsName
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* The filename to check. It can also contains pathname.
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*
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* @param WildCardsPermissible
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* If this is set to FALSE and if filename contains wildcard, the function
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* will fail
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*
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* @param PathNamePermissible
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* If this is set to FALSE and if the filename comes with a pathname, the
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* function will fail
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*
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* @param LeadingBackslashPermissible
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* If this is set to FALSE and if the filename starts with a backslash, the
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* function will fail
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*
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* @return TRUE if the DbcsName is legal, FALSE otherwise
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*
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* @remarks None
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*
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*--*/
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BOOLEAN
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NTAPI
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FsRtlIsFatDbcsLegal(IN ANSI_STRING DbcsName,
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IN BOOLEAN WildCardsPermissible,
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IN BOOLEAN PathNamePermissible,
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IN BOOLEAN LeadingBackslashPermissible)
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{
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ANSI_STRING FirstPart, RemainingPart, Name;
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BOOLEAN LastDot;
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USHORT i;
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PAGED_CODE();
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/* Just quit if the string is empty */
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if (!DbcsName.Length)
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return FALSE;
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/* DbcsName wasn't supposed to be started with \ */
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if (!LeadingBackslashPermissible && DbcsName.Buffer[0] == '\\')
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return FALSE;
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/* DbcsName was allowed to be started with \, but now, remove it */
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else if (LeadingBackslashPermissible && DbcsName.Buffer[0] == '\\')
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{
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DbcsName.Buffer = DbcsName.Buffer + 1;
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DbcsName.Length = DbcsName.Length - 1;
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DbcsName.MaximumLength = DbcsName.MaximumLength - 1;
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}
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/* Extract first part of the DbcsName to work on */
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FsRtlDissectDbcs(DbcsName, &FirstPart, &RemainingPart);
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while (FirstPart.Length > 0)
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{
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/* Reset dots count */
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LastDot = FALSE;
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/* Accept special filename if wildcards are allowed */
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if (WildCardsPermissible && (FirstPart.Length == 1 || FirstPart.Length == 2) && FirstPart.Buffer[0] == '.')
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{
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if (FirstPart.Length == 2)
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{
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if (FirstPart.Buffer[1] == '.')
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{
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goto EndLoop;
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}
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}
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else
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{
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goto EndLoop;
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}
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}
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/* Filename must be 8.3 filename */
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if (FirstPart.Length < 3 || FirstPart.Length > 12)
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return FALSE;
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/* Now, we will parse the filename to find everything bad in */
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for (i = 0; i < FirstPart.Length; i++)
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{
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/* First make sure the character it's not the Lead DBCS */
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if (FsRtlIsLeadDbcsCharacter(FirstPart.Buffer[i]))
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{
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if (i == (FirstPart.Length) - 1)
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return FALSE;
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i++;
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}
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/* Then check for bad characters */
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else if (!FsRtlIsAnsiCharacterLegalFat(FirstPart.Buffer[i], WildCardsPermissible))
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{
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return FALSE;
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}
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else if (FirstPart.Buffer[i] == '.')
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{
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/* Filename can only contain one dot */
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if (LastDot)
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return FALSE;
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LastDot = TRUE;
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/* We mustn't have spaces before dot or at the end of the filename
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* and no dot at the beginning of the filename */
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if ((i == (FirstPart.Length) - 1) || i == 0)
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return FALSE;
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if (i > 0)
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if (FirstPart.Buffer[i - 1] == ' ')
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return FALSE;
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/* Filename must be 8.3 filename and not 3.8 filename */
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if ((FirstPart.Length - 1) - i > 3)
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return FALSE;
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}
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}
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/* Filename mustn't finish with a space */
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if (FirstPart.Buffer[FirstPart.Length - 1] == ' ')
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return FALSE;
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EndLoop:
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/* Preparing next loop */
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Name.Buffer = RemainingPart.Buffer;
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Name.Length = RemainingPart.Length;
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Name.MaximumLength = RemainingPart.MaximumLength;
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/* Call once again our dissect function */
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FsRtlDissectDbcs(Name, &FirstPart, &RemainingPart);
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/* We found a pathname, it wasn't allowed */
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if (FirstPart.Length > 0 && !PathNamePermissible)
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return FALSE;
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}
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return TRUE;
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}
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/*++
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* @name FsRtlIsHpfsDbcsLegal
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* @implemented
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*
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* Returns TRUE if the given DbcsName is a valid HPFS filename
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*
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* @param DbcsName
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* The filename to check. It can also contains pathname.
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*
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* @param WildCardsPermissible
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* If this is set to FALSE and if filename contains wildcard, the function
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* will fail
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*
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* @param PathNamePermissible
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* If this is set to FALSE and if the filename comes with a pathname, the
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* function will fail
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*
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* @param LeadingBackslashPermissible
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* If this is set to FALSE and if the filename starts with a backslash, the
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* function will fail
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*
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* @return TRUE if the DbcsName is legal, FALSE otherwise
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*
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* @remarks None
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*
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*--*/
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BOOLEAN
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NTAPI
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FsRtlIsHpfsDbcsLegal(IN ANSI_STRING DbcsName,
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IN BOOLEAN WildCardsPermissible,
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IN BOOLEAN PathNamePermissible,
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IN BOOLEAN LeadingBackslashPermissible)
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{
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ANSI_STRING FirstPart, RemainingPart, Name;
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USHORT i;
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PAGED_CODE();
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/* Just quit if the string is empty */
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if (!DbcsName.Length)
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return FALSE;
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/* DbcsName wasn't supposed to be started with \ */
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if (!LeadingBackslashPermissible && DbcsName.Buffer[0] == '\\')
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return FALSE;
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/* DbcsName was allowed to be started with \, but now, remove it */
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else if (LeadingBackslashPermissible && DbcsName.Buffer[0] == '\\')
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{
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DbcsName.Buffer = DbcsName.Buffer + 1;
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DbcsName.Length = DbcsName.Length - 1;
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DbcsName.MaximumLength = DbcsName.MaximumLength - 1;
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}
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/* Extract first part of the DbcsName to work on */
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FsRtlDissectDbcs(DbcsName, &FirstPart, &RemainingPart);
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while (FirstPart.Length > 0)
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{
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/* Accept special filename if wildcards are allowed */
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if (WildCardsPermissible && (FirstPart.Length == 1 || FirstPart.Length == 2) && FirstPart.Buffer[0] == '.')
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{
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if (FirstPart.Length == 2)
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{
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if (FirstPart.Buffer[1] == '.')
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{
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goto EndLoop;
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}
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}
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else
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{
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goto EndLoop;
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}
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}
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/* Filename must be 255 bytes maximum */
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if (FirstPart.Length > 255)
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return FALSE;
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/* Now, we will parse the filename to find everything bad in */
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for (i = 0; i < FirstPart.Length; i++)
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{
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/* First make sure the character it's not the Lead DBCS */
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if (FsRtlIsLeadDbcsCharacter(FirstPart.Buffer[i]))
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{
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if (i == (FirstPart.Length) - 1)
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return FALSE;
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i++;
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}
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/* Then check for bad characters */
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else if (!FsRtlIsAnsiCharacterLegalHpfs(FirstPart.Buffer[i], WildCardsPermissible))
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{
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return FALSE;
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}
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}
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/* Filename mustn't finish with a space or a dot */
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if ((FirstPart.Buffer[FirstPart.Length - 1] == ' ') ||
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(FirstPart.Buffer[FirstPart.Length - 1] == '.'))
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return FALSE;
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EndLoop:
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/* Preparing next loop */
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Name.Buffer = RemainingPart.Buffer;
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Name.Length = RemainingPart.Length;
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Name.MaximumLength = RemainingPart.MaximumLength;
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/* Call once again our dissect function */
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FsRtlDissectDbcs(Name, &FirstPart, &RemainingPart);
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/* We found a pathname, it wasn't allowed */
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if (FirstPart.Length > 0 && !PathNamePermissible)
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return FALSE;
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}
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return TRUE;
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}
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