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sys: FspUnicodePathIsValid()

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This commit is contained in:
Bill Zissimopoulos
2016-02-10 11:37:28 -08:00
parent cc19ddcd92
commit 5d26211c38
3 changed files with 39 additions and 1 deletions
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29
src/sys/util.c
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@ -6,6 +6,7 @@
#include <sys/driver.h>
BOOLEAN FspUnicodePathIsValid(PUNICODE_STRING Path, BOOLEAN AllowStreams);
VOID FspUnicodePathSuffix(PUNICODE_STRING Path, PUNICODE_STRING Remain, PUNICODE_STRING Suffix);
NTSTATUS FspCreateGuid(GUID *Guid);
VOID FspInitializeSynchronousWorkItem(FSP_SYNCHRONOUS_WORK_ITEM *SynchronousWorkItem,
@ -18,6 +19,7 @@ VOID FspQueueDelayedWorkItem(FSP_DELAYED_WORK_ITEM *DelayedWorkItem, LARGE_INTEG
static KDEFERRED_ROUTINE FspQueueDelayedWorkItemDPC;
#ifdef ALLOC_PRAGMA
#pragma alloc_text(PAGE, FspUnicodePathIsValid)
#pragma alloc_text(PAGE, FspUnicodePathSuffix)
#pragma alloc_text(PAGE, FspCreateGuid)
#pragma alloc_text(PAGE, FspInitializeSynchronousWorkItem)
@ -69,6 +71,31 @@ PVOID FspAllocateIrpMustSucceed(CCHAR StackSize)
}
}
BOOLEAN FspUnicodePathIsValid(PUNICODE_STRING Path, BOOLEAN AllowStreams)
{
PAGED_CODE();
PWSTR PathBgn, PathEnd, PathPtr;
PathBgn = Path->Buffer;
PathEnd = (PWSTR)((PUINT8)PathBgn + Path->Length);
PathPtr = PathBgn;
while (PathEnd > PathPtr)
if (L'\\' == *PathPtr)
{
PathPtr++;
if (PathEnd > PathPtr && L'\\' == *PathPtr)
return FALSE;
}
else if (!AllowStreams && L':' == *PathPtr)
return FALSE;
else
PathPtr++;
return TRUE;
}
VOID FspUnicodePathSuffix(PUNICODE_STRING Path, PUNICODE_STRING Remain, PUNICODE_STRING Suffix)
{
PAGED_CODE();
@ -86,7 +113,7 @@ VOID FspUnicodePathSuffix(PUNICODE_STRING Path, PUNICODE_STRING Remain, PUNICODE
if (L'\\' == *PathPtr)
{
RemainEnd = PathPtr++;
for (; L'\\' == *PathPtr; PathPtr++)
for (; PathEnd > PathPtr && L'\\' == *PathPtr; PathPtr++)
;
SuffixBgn = PathPtr;
}