1024 lines
26 KiB
C
1024 lines
26 KiB
C
/*++
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Copyright (c) 1991 Microsoft Corporation
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Module Name:
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NameSup.c
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Abstract:
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This module implements the Ntfs Name support routines
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Author:
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Gary Kimura [GaryKi] & Tom Miller [TomM] 20-Feb-1990
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Revision History:
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--*/
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#include "NtfsProc.h"
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#define Dbg (DEBUG_TRACE_NAMESUP)
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, NtfsCollateNames)
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#pragma alloc_text(PAGE, NtfsIsFatNameValid)
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#pragma alloc_text(PAGE, NtfsIsFileNameValid)
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#pragma alloc_text(PAGE, NtfsParseName)
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#pragma alloc_text(PAGE, NtfsParsePath)
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#pragma alloc_text(PAGE, NtfsUpcaseName)
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#endif
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#define MAX_CHARS_IN_8_DOT_3 (12)
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PARSE_TERMINATION_REASON
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NtfsParsePath (
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IN UNICODE_STRING Path,
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IN BOOLEAN WildCardsPermissible,
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OUT PUNICODE_STRING FirstPart,
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OUT PNTFS_NAME_DESCRIPTOR Name,
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OUT PUNICODE_STRING RemainingPart
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)
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/*++
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Routine Description:
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This routine takes as input a path. Each component of the path is
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checked until either:
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- The end of the path has been reached, or
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- A well formed complex name is excountered, or
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- An illegal character is encountered, or
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- A complex name component is malformed
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At this point the return value is set to one of the three reasons
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above, and the arguments are set as follows:
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FirstPart: All the components up to one containing an illegal
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character or colon character. May be the whole path.
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Name: The "pieces" of a component containing an illegal
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character or colon character. This name is actually
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a struncture containing the four pieces of a name,
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"file name, attribute type, attribute name, version
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number." In the example below, they are shown
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separated by plus signs.
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RemainingPart: All the remaining components.
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A preceding or trailing backslash is ignored during processing and
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stripped in either FirstPart or RemainingPart. Following are some
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examples of this routine's actions.
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Path FirstPart Name Remaining
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================ ========= ============ =========
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\nt\pri\os \nt\pri\os <empty>
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\nt\pri\os\ \nt\pri\os <empty>
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nt\pri\os \nt\pri\os <empty>
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\nt\pr"\os \nt pr" os
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\nt\pri\os:contr::3\ntfs \nt\pri os + contr + + 3 ntfs
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\nt\pri\os\circle:pict:circ \nt\pri\os circle + pict + circ <empty>
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Arguments:
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Path - This unicode string descibes the path to parse. Note that path
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here may only describe a single component.
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WildCardsPermissible - This parameter tells us if wild card characters
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should be considered legal.
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FirstPart - This unicode string will receive portion of the path, up to
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a component boundry, successfully parsed before the parse terminated.
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Note that store for this string comes from the Path parameter.
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Name - This is the name we were parsing when we reached our termination
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condition. It is a srtucture of strings that receive the file name,
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attribute type, attribute name, and version number respectively.
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It wil be filled in only to the extent that the parse succeeded. For
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example, in the case we encounter an illegal character in the
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attribute type field, only the file name field will be filled in.
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This may signal a special control file, and this possibility must be
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investigated by the file system.
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RemainingPart - This string will receive any portion of the path, starting
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at the first component boundry after the termination name, not parsed.
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It will often be an empty string.
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ReturnValue:
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An enumerated type with one of the following values:
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EndOfPathReached - The path was fully parsed. Only first part
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is filled in.
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NonSimpleName - A component of the path containing a legal,
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well formed non-simple name was encountered.
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IllegalCharacterInName - An illegal character was encountered. Parsing
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stops immediately.
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MalFormedName - A non-simple name did not conform to the
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correct format. This may be a result of too
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many fields, or a malformed version number.
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AttributeOnly - A component of the path containing a legal
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well formed non-simple name was encountered
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which does not have a file name.
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VersionNumberPresent - A component of the path containing a legal
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well formed non-simple name was encountered
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which contains a version number.
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--*/
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{
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UNICODE_STRING FirstName;
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BOOLEAN WellFormed;
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BOOLEAN MoreNamesInPath;
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BOOLEAN FirstIteration;
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BOOLEAN FoundIllegalCharacter;
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PARSE_TERMINATION_REASON TerminationReason;
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PAGED_CODE();
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//
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// Initialize some loacal variables and OUT parameters.
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//
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FirstIteration = TRUE;
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MoreNamesInPath = TRUE;
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//
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// Clear the fieldspresent flag in the name descriptor.
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//
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Name->FieldsPresent = 0;
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//
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// By default, set the returned first part to start at the beginning of
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// the input buffer and include a leading backslash.
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//
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FirstPart->Buffer = Path.Buffer;
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if (Path.Buffer[0] == L'\\') {
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FirstPart->Length = 2;
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FirstPart->MaximumLength = 2;
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} else {
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FirstPart->Length = 0;
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FirstPart->MaximumLength = 0;
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}
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//
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// Do the first check outside the loop in case we are given a backslash
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// by itself.
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//
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if (FirstPart->Length == Path.Length) {
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RemainingPart->Length = 0;
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RemainingPart->Buffer = &Path.Buffer[Path.Length >> 1];
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return EndOfPathReached;
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}
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//
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// Crack the path, checking each componant
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//
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while (MoreNamesInPath) {
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FsRtlDissectName( Path, &FirstName, RemainingPart );
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MoreNamesInPath = (BOOLEAN)(RemainingPart->Length != 0);
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//
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// If this is not the last name in the path, then attributes
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// and version numbers are not allowed. If this is the last
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// name then propagate the callers arguments.
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//
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WellFormed = NtfsParseName( FirstName,
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WildCardsPermissible,
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&FoundIllegalCharacter,
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Name );
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//
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// Check the cases when we will break out of this loop, ie. if the
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// the name was not well formed or it was non-simple.
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//
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if ( !WellFormed ||
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(Name->FieldsPresent != FILE_NAME_PRESENT_FLAG)
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//
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// TEMPCODE TRAILING_DOT
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//
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|| (Name->FileName.Length != Name->FileName.MaximumLength)
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) {
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break;
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}
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//
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// We will continue parsing this string, so consider the current
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// FirstName to be parsed and add it to FirstPart. Also reset
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// the Name->FieldsPresent variable.
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//
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if ( FirstIteration ) {
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FirstPart->Length += FirstName.Length;
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FirstIteration = FALSE;
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} else {
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FirstPart->Length += (sizeof(WCHAR) + FirstName.Length);
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}
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FirstPart->MaximumLength = FirstPart->Length;
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Path = *RemainingPart;
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}
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//
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// At this point FirstPart, Name, and RemainingPart should all be set
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// correctly. It remains, only to generate the correct return value.
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//
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if ( !WellFormed ) {
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if ( FoundIllegalCharacter ) {
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TerminationReason = IllegalCharacterInName;
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} else {
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TerminationReason = MalFormedName;
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}
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} else {
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if ( Name->FieldsPresent == FILE_NAME_PRESENT_FLAG ) {
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//
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// TEMPCODE TRAILING_DOT
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//
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if (Name->FileName.Length != Name->FileName.MaximumLength) {
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TerminationReason = NonSimpleName;
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} else {
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TerminationReason = EndOfPathReached;
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}
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} else if (FlagOn( Name->FieldsPresent, VERSION_NUMBER_PRESENT_FLAG )) {
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TerminationReason = VersionNumberPresent;
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} else if (!FlagOn( Name->FieldsPresent, FILE_NAME_PRESENT_FLAG )) {
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TerminationReason = AttributeOnly;
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} else {
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TerminationReason = NonSimpleName;
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}
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}
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return TerminationReason;
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}
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BOOLEAN
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NtfsParseName (
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IN const UNICODE_STRING Name,
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IN BOOLEAN WildCardsPermissible,
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OUT PBOOLEAN FoundIllegalCharacter,
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OUT PNTFS_NAME_DESCRIPTOR ParsedName
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)
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/*++
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Routine Description:
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This routine takes as input a single name component. It is processed into
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file name, attribute type, attribute name, and version number fields.
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If the name is well formed according to the following rules:
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A. An NTFS name may not contain any of the following characters:
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0x0000-0x001F " / < > ? | *
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B. An Ntfs name can take any of the following forms:
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::T
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:A
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:A:T
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N
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N:::V
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N::T
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N::T:V
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N:A
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N:A::V
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N:A:T
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N:A:T:V
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If a version number is present, there must be a file name.
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We specifically note the legal names without a filename
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component (AttributeOnly) and any name with a version number
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(VersionNumberPresent).
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Incidently, N corresponds to file name, T to attribute type, A to
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attribute name, and V to version number.
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TRUE is returned. If FALSE is returned, then the OUT parameter
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FoundIllegalCharacter will be set appropriatly. Note that the buffer
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space for ParsedName comes from Name.
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Arguments:
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Name - This is the single path element input name.
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WildCardsPermissible - This determines if wild cards characters should be
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considered legal
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FoundIllegalCharacter - This parameter will receive a TRUE if the the
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function returns FALSE because of encountering an illegal character.
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ParsedName - Recieves the pieces of the processed name. Note that the
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storage for all the string from the input Name.
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ReturnValue:
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TRUE if the Name is well formed, and FALSE otherwise.
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--*/
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{
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ULONG Index;
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ULONG NameLength;
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ULONG FieldCount;
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ULONG FieldIndexes[5];
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UCHAR ValidCharFlags = FSRTL_NTFS_LEGAL;
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PULONG Fields;
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BOOLEAN IsNameValid = TRUE;
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PAGED_CODE();
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//
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// Initialize some OUT parameters and local variables.
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//
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*FoundIllegalCharacter = FALSE;
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Fields = &ParsedName->FieldsPresent;
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*Fields = 0;
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FieldCount = 1;
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FieldIndexes[0] = 0xFFFFFFFF; // We add on to this later...
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//
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// For starters, zero length names are invalid.
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//
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NameLength = Name.Length / sizeof(WCHAR);
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if ( NameLength == 0 ) {
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return FALSE;
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}
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//
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// Now name must correspond to a legal single Ntfs Name.
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//
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for (Index = 0; Index < NameLength; Index += 1) {
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WCHAR Char;
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Char = Name.Buffer[Index];
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//
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// First check that file names are well formed in terms of colons.
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//
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if ( Char == L':' ) {
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//
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// A colon can't be the last character, and we can't have
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// more than three colons.
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//
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if ( (Index == NameLength - 1) ||
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(FieldCount >= 4) ) {
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IsNameValid = FALSE;
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break;
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}
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FieldIndexes[FieldCount] = Index;
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FieldCount += 1;
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ValidCharFlags = FSRTL_NTFS_STREAM_LEGAL;
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continue;
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}
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//
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// Now check for wild card characters if they weren't allowed,
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// and other illegal characters.
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//
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if ((Char <= 0xff) &&
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!FsRtlTestAnsiCharacter( Char, TRUE, WildCardsPermissible, ValidCharFlags )) {
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IsNameValid = FALSE;
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*FoundIllegalCharacter = TRUE;
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break;
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}
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}
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//
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// If we ran into a problem with one of the fields, don't try to load
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// up that field into the out parameter.
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//
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if ( !IsNameValid ) {
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FieldCount -= 1;
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//
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// Set the end of the last field to the current Index.
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//
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} else {
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FieldIndexes[FieldCount] = Index;
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}
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//
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// Now we load up the OUT parmeters
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//
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while ( FieldCount != 0 ) {
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ULONG StartIndex;
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ULONG EndIndex;
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USHORT Length;
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//
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// Add one here since this is actually the position of the colon.
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//
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StartIndex = FieldIndexes[FieldCount - 1] + 1;
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EndIndex = FieldIndexes[FieldCount];
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Length = (USHORT)((EndIndex - StartIndex) * sizeof(WCHAR));
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//
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// If this field is empty, skip it
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//
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if ( Length == 0 ) {
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FieldCount -= 1;
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continue;
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}
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//
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// Now depending of the field, extract the appropriate information.
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//
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if ( FieldCount == 1 ) {
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UNICODE_STRING TempName;
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TempName.Buffer = &Name.Buffer[StartIndex];
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TempName.Length = Length;
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TempName.MaximumLength = Length;
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//
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// If the resulting length is 0, forget this entry.
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//
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if (TempName.Length == 0) {
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FieldCount -= 1;
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continue;
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}
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SetFlag(*Fields, FILE_NAME_PRESENT_FLAG);
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ParsedName->FileName = TempName;
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} else if ( FieldCount == 2) {
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SetFlag(*Fields, ATTRIBUTE_NAME_PRESENT_FLAG);
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ParsedName->AttributeName.Buffer = &Name.Buffer[StartIndex];
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ParsedName->AttributeName.Length = Length;
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ParsedName->AttributeName.MaximumLength = Length;
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} else if ( FieldCount == 3) {
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SetFlag(*Fields, ATTRIBUTE_TYPE_PRESENT_FLAG);
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ParsedName->AttributeType.Buffer = &Name.Buffer[StartIndex];
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ParsedName->AttributeType.Length = Length;
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ParsedName->AttributeType.MaximumLength = Length;
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} else if ( FieldCount == 4) {
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ULONG VersionNumber;
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STRING VersionNumberA;
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UNICODE_STRING VersionNumberU;
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NTSTATUS Status;
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UCHAR *endp = NULL;
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VersionNumberU.Buffer = &Name.Buffer[StartIndex];
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VersionNumberU.Length = Length;
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VersionNumberU.MaximumLength = Length;
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//
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// Note that the resulting Ansi string is null terminated.
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//
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Status = RtlUnicodeStringToCountedOemString( &VersionNumberA,
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&VersionNumberU,
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TRUE );
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//
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// If something went wrong (most likely ran out of pool), raise.
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//
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if ( !NT_SUCCESS(Status) ) {
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ExRaiseStatus( Status );
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}
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VersionNumber = 0; //**** strtoul( VersionNumberA.Buffer, &endp, 0 );
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RtlFreeOemString( &VersionNumberA );
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if ( (VersionNumber == MAXULONG) || (endp != NULL) ) {
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IsNameValid = FALSE;
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} else {
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SetFlag( *Fields, VERSION_NUMBER_PRESENT_FLAG );
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ParsedName->VersionNumber = VersionNumber;
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}
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}
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FieldCount -= 1;
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}
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//
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// Check for special malformed cases.
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//
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if (FlagOn( *Fields, VERSION_NUMBER_PRESENT_FLAG )
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&& !FlagOn( *Fields, FILE_NAME_PRESENT_FLAG )) {
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IsNameValid = FALSE;
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}
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return IsNameValid;
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}
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VOID
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NtfsUpcaseName (
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IN PWCH UpcaseTable,
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IN ULONG UpcaseTableSize,
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IN OUT PUNICODE_STRING Name
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)
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/*++
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Routine Description:
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This routine upcases a string.
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Arguments:
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UpcaseTable - Pointer to an array of Unicode upcased characters indexed by
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the Unicode character to be upcased.
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UpcaseTableSize - Size of the Upcase table in unicode characters
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Name - Supplies the string to upcase
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Return Value:
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None.
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--*/
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{
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ULONG i;
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ULONG Length;
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PAGED_CODE();
|
||
|
||
DebugTrace( +1, Dbg, ("NtfsUpcaseName\n") );
|
||
DebugTrace( 0, Dbg, ("Name = %Z\n", Name) );
|
||
|
||
Length = Name->Length / sizeof(WCHAR);
|
||
|
||
for (i=0; i < Length; i += 1) {
|
||
|
||
if ((ULONG)Name->Buffer[i] < UpcaseTableSize) {
|
||
Name->Buffer[i] = UpcaseTable[ (ULONG)Name->Buffer[i] ];
|
||
}
|
||
}
|
||
|
||
DebugTrace( 0, Dbg, ("Upcased Name = %Z\n", Name) );
|
||
DebugTrace( -1, Dbg, ("NtfsUpcaseName -> VOID\n") );
|
||
|
||
return;
|
||
}
|
||
|
||
|
||
FSRTL_COMPARISON_RESULT
|
||
NtfsCollateNames (
|
||
IN PCWCH UpcaseTable,
|
||
IN ULONG UpcaseTableSize,
|
||
IN PCUNICODE_STRING Expression,
|
||
IN PCUNICODE_STRING Name,
|
||
IN FSRTL_COMPARISON_RESULT WildIs,
|
||
IN BOOLEAN IgnoreCase
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This routine compares an expression with a name lexigraphically for
|
||
LessThan, EqualTo, or GreaterThan. If the expression does not contain
|
||
any wildcards, this procedure does a complete comparison. If the
|
||
expression does contain wild cards, then the comparison is only done up
|
||
to the first wildcard character. Name may not contain wild cards.
|
||
The wildcard character compares as less then all other characters. So
|
||
the wildcard name "*.*" will always compare less than all all strings.
|
||
|
||
Arguments:
|
||
|
||
UpcaseTable - Pointer to an array of Unicode upcased characters indexed by
|
||
the Unicode character to be upcased.
|
||
|
||
UpcaseTableSize - Size of the Upcase table in unicode characters
|
||
|
||
Expression - Supplies the first name expression to compare, optionally with
|
||
wild cards. Note that caller must have already upcased
|
||
the name (this will make lookup faster).
|
||
|
||
Name - Supplies the second name to compare - no wild cards allowed.
|
||
The caller must have already upcased the name.
|
||
|
||
WildIs - Determines what Result is returned if a wild card is encountered
|
||
in the Expression String. For example, to find the start of
|
||
an expression in the Btree, LessThan should be supplied; then
|
||
GreaterThan should be supplied to find the end of the expression
|
||
in the tree.
|
||
|
||
IgnoreCase - TRUE if case should be ignored for the comparison
|
||
|
||
Return Value:
|
||
|
||
FSRTL_COMPARISON_RESULT - LessThan if Expression < Name
|
||
EqualTo if Expression == Name
|
||
GreaterThan if Expression > Name
|
||
|
||
--*/
|
||
|
||
{
|
||
WCHAR ConstantChar;
|
||
WCHAR ExpressionChar;
|
||
|
||
ULONG i;
|
||
ULONG Length;
|
||
|
||
PAGED_CODE();
|
||
|
||
DebugTrace( +1, Dbg, ("NtfsCollateNames\n") );
|
||
DebugTrace( 0, Dbg, ("Expression = %Z\n", Expression) );
|
||
DebugTrace( 0, Dbg, ("Name = %Z\n", Name) );
|
||
DebugTrace( 0, Dbg, ("WildIs = %08lx\n", WildIs) );
|
||
DebugTrace( 0, Dbg, ("IgnoreCase = %02lx\n", IgnoreCase) );
|
||
|
||
//
|
||
// Calculate the length in wchars that we need to compare. This will
|
||
// be the smallest length of the two strings.
|
||
//
|
||
|
||
if (Expression->Length < Name->Length) {
|
||
|
||
Length = Expression->Length / sizeof(WCHAR);
|
||
|
||
} else {
|
||
|
||
Length = Name->Length / sizeof(WCHAR);
|
||
}
|
||
|
||
//
|
||
// Now we'll just compare the elements in the names until we can decide
|
||
// their lexicagrahical ordering, checking for wild cards in
|
||
// LocalExpression (from Expression).
|
||
//
|
||
// If an upcase table was specified, the compare is done case insensitive.
|
||
//
|
||
|
||
for (i = 0; i < Length; i += 1) {
|
||
|
||
ConstantChar = Name->Buffer[i];
|
||
ExpressionChar = Expression->Buffer[i];
|
||
|
||
if ( IgnoreCase ) {
|
||
|
||
if (ConstantChar < UpcaseTableSize) {
|
||
ConstantChar = UpcaseTable[(ULONG)ConstantChar];
|
||
}
|
||
if (ExpressionChar < UpcaseTableSize) {
|
||
ExpressionChar = UpcaseTable[(ULONG)ExpressionChar];
|
||
}
|
||
}
|
||
|
||
if ( FsRtlIsUnicodeCharacterWild(ExpressionChar) ) {
|
||
|
||
DebugTrace( -1, Dbg, ("NtfsCollateNames -> %08lx (Wild)\n", WildIs) );
|
||
return WildIs;
|
||
}
|
||
|
||
if ( ExpressionChar < ConstantChar ) {
|
||
|
||
DebugTrace( -1, Dbg, ("NtfsCollateNames -> LessThan\n") );
|
||
return LessThan;
|
||
}
|
||
|
||
if ( ExpressionChar > ConstantChar ) {
|
||
|
||
DebugTrace( -1, Dbg, ("NtfsCollateNames -> GreaterThan\n") );
|
||
return GreaterThan;
|
||
}
|
||
}
|
||
|
||
//
|
||
// We've gone through the entire short match and they're equal
|
||
// so we need to now check which one is shorter, or, if
|
||
// LocalExpression is longer, we need to see if the next character is
|
||
// wild! (For example, an enumeration of "ABC*", must return
|
||
// "ABC".
|
||
//
|
||
|
||
if (Expression->Length < Name->Length) {
|
||
|
||
DebugTrace( -1, Dbg, ("NtfsCollateNames -> LessThan (length)\n") );
|
||
return LessThan;
|
||
}
|
||
|
||
if (Expression->Length > Name->Length) {
|
||
|
||
if (FsRtlIsUnicodeCharacterWild(Expression->Buffer[i])) {
|
||
|
||
DebugTrace( -1, Dbg, ("NtfsCollateNames -> %08lx (trailing wild)\n", WildIs) );
|
||
return WildIs;
|
||
}
|
||
|
||
DebugTrace( -1, Dbg, ("NtfsCollateNames -> GreaterThan (length)\n") );
|
||
return GreaterThan;
|
||
}
|
||
|
||
DebugTrace( -1, Dbg, ("NtfsCollateNames -> EqualTo\n") );
|
||
return EqualTo;
|
||
}
|
||
|
||
BOOLEAN
|
||
NtfsIsFileNameValid (
|
||
IN PUNICODE_STRING FileName,
|
||
IN BOOLEAN WildCardsPermissible
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This routine checks if the specified file name is valid. Note that
|
||
only the file name part of the name is allowed, ie. no colons are
|
||
permitted.
|
||
|
||
Arguments:
|
||
|
||
FileName - Supplies the name to check.
|
||
|
||
WildCardsPermissible - Tells us if wild card characters are ok.
|
||
|
||
Return Value:
|
||
|
||
BOOLEAN - TRUE if the name is valid, FALSE otherwise.
|
||
|
||
--*/
|
||
|
||
{
|
||
ULONG Index;
|
||
ULONG NameLength;
|
||
BOOLEAN AllDots = TRUE;
|
||
BOOLEAN IsNameValid = TRUE;
|
||
|
||
PAGED_CODE();
|
||
|
||
DebugTrace( +1, Dbg, ("NtfsIsFileNameValid\n") );
|
||
DebugTrace( 0, Dbg, ("FileName = %Z\n", FileName) );
|
||
DebugTrace( 0, Dbg, ("WildCardsPermissible = %s\n",
|
||
WildCardsPermissible ? "TRUE" : "FALSE") );
|
||
|
||
//
|
||
// It better be a valid unicode string.
|
||
//
|
||
|
||
if ((FileName->Length == 0) || FlagOn( FileName->Length, 1 )) {
|
||
|
||
IsNameValid = FALSE;
|
||
|
||
} else {
|
||
|
||
//
|
||
// Check if corresponds to a legal single Ntfs Name.
|
||
//
|
||
|
||
NameLength = FileName->Length / sizeof(WCHAR);
|
||
|
||
for (Index = 0; Index < NameLength; Index += 1) {
|
||
|
||
WCHAR Char;
|
||
|
||
Char = FileName->Buffer[Index];
|
||
|
||
//
|
||
// Check for wild card characters if they weren't allowed, and
|
||
// check for the other illegal characters including the colon and
|
||
// backslash characters since this can only be a single component.
|
||
//
|
||
|
||
if ( ((Char <= 0xff) &&
|
||
!FsRtlIsAnsiCharacterLegalNtfs(Char, WildCardsPermissible)) ||
|
||
(Char == L':') ||
|
||
(Char == L'\\') ) {
|
||
|
||
IsNameValid = FALSE;
|
||
break;
|
||
}
|
||
|
||
//
|
||
// Remember if this is not a '.' character.
|
||
//
|
||
|
||
if (Char != L'.') {
|
||
|
||
AllDots = FALSE;
|
||
}
|
||
}
|
||
|
||
//
|
||
// The names '.' and '..' are also invalid.
|
||
//
|
||
|
||
if (AllDots
|
||
&& (NameLength == 1
|
||
|| NameLength == 2)) {
|
||
|
||
IsNameValid = FALSE;
|
||
}
|
||
}
|
||
|
||
DebugTrace( -1, Dbg, ("NtfsIsFileNameValid -> %s\n", IsNameValid ? "TRUE" : "FALSE") );
|
||
|
||
return IsNameValid;
|
||
}
|
||
|
||
|
||
BOOLEAN
|
||
NtfsIsFatNameValid (
|
||
IN PUNICODE_STRING FileName,
|
||
IN BOOLEAN WildCardsPermissible
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This routine checks if the specified file name is conformant to the
|
||
Fat 8.3 file naming rules.
|
||
|
||
Arguments:
|
||
|
||
FileName - Supplies the name to check.
|
||
|
||
WildCardsPermissible - Tells us if wild card characters are ok.
|
||
|
||
Return Value:
|
||
|
||
BOOLEAN - TRUE if the name is valid, FALSE otherwise.
|
||
|
||
--*/
|
||
|
||
{
|
||
BOOLEAN Results;
|
||
STRING DbcsName;
|
||
USHORT i;
|
||
CHAR Buffer[24];
|
||
WCHAR wc;
|
||
|
||
PAGED_CODE();
|
||
|
||
//
|
||
// If the name is more than 24 bytes then it can't be a valid Fat name.
|
||
//
|
||
|
||
if (FileName->Length > 24) {
|
||
|
||
return FALSE;
|
||
}
|
||
|
||
//
|
||
// We will do some extra checking ourselves because we really want to be
|
||
// fairly restrictive of what an 8.3 name contains. That way
|
||
// we will then generate an 8.3 name for some nomially valid 8.3
|
||
// names (e.g., names that contain DBCS characters). The extra characters
|
||
// we'll filter off are those characters less than and equal to the space
|
||
// character and those beyond lowercase z.
|
||
//
|
||
|
||
if (FlagOn( NtfsData.Flags,NTFS_FLAGS_ALLOW_EXTENDED_CHAR )) {
|
||
|
||
for (i = 0; i < FileName->Length / sizeof( WCHAR ); i += 1) {
|
||
|
||
wc = FileName->Buffer[i];
|
||
|
||
if ((wc <= 0x0020) || (wc == 0x007c)) { return FALSE; }
|
||
}
|
||
|
||
} else {
|
||
|
||
for (i = 0; i < FileName->Length / sizeof( WCHAR ); i += 1) {
|
||
|
||
wc = FileName->Buffer[i];
|
||
|
||
if ((wc <= 0x0020) || (wc >= 0x007f) || (wc == 0x007c)) { return FALSE; }
|
||
}
|
||
}
|
||
|
||
//
|
||
// The characters match up okay so now build up the dbcs string to call
|
||
// the fsrtl routine to check for legal 8.3 formation
|
||
//
|
||
|
||
Results = FALSE;
|
||
|
||
DbcsName.MaximumLength = 24;
|
||
DbcsName.Buffer = Buffer;
|
||
|
||
if (NT_SUCCESS(RtlUnicodeStringToCountedOemString( &DbcsName, FileName, FALSE))) {
|
||
|
||
if (FsRtlIsFatDbcsLegal( DbcsName, WildCardsPermissible, FALSE, FALSE )) {
|
||
|
||
Results = TRUE;
|
||
}
|
||
}
|
||
|
||
//
|
||
// And return to our caller
|
||
//
|
||
|
||
return Results;
|
||
}
|
||
|