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[NTOSKRNL_VISTA] Implement FsRtlGetEcpListFromIrp and FsRtlGetNextExtraCreateParameter

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CORE-15452
This commit is contained in:
Pierre Schweitzer 2018-12-25 13:45:41 +01:00
parent a76b8843a8
commit f75ea083e3
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GPG Key ID: 7545556C3D585B0B
1 changed files with 119 additions and 0 deletions
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119
sdk/lib/drivers/ntoskrnl_vista/fsrtl.c
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@ -9,6 +9,33 @@
#include <ntdef.h>
#include <ntifs.h>
typedef struct _ECP_LIST
{
ULONG Signature;
ULONG Flags;
LIST_ENTRY EcpList;
} ECP_LIST, *PECP_LIST;
typedef ULONG ECP_HEADER_FLAGS;
typedef struct _ECP_HEADER
{
ULONG Signature;
ULONG Spare;
LIST_ENTRY ListEntry;
GUID EcpType;
PFSRTL_EXTRA_CREATE_PARAMETER_CLEANUP_CALLBACK CleanupCallback;
ECP_HEADER_FLAGS Flags;
ULONG Size;
PVOID ListAllocatedFrom;
PVOID Filter;
} ECP_HEADER, *PECP_HEADER;
#define ECP_HEADER_SIZE (sizeof(ECP_HEADER))
#define ECP_HEADER_TO_CONTEXT(H) ((PVOID)((ULONG_PTR)H + ECP_HEADER_SIZE))
#define ECP_CONTEXT_TO_HEADER(C) ((PECP_HEADER)((ULONG_PTR)C - ECP_HEADER_SIZE))
NTKERNELAPI
NTSTATUS
NTAPI
@ -240,3 +267,95 @@ FsRtlValidateReparsePointBuffer(IN ULONG BufferLength,
return STATUS_IO_REPARSE_TAG_INVALID;
}
NTKERNELAPI
NTSTATUS
NTAPI
FsRtlGetEcpListFromIrp(IN PIRP Irp,
OUT PECP_LIST *EcpList)
{
/* Call Io */
return IoGetIrpExtraCreateParameter(Irp, EcpList);
}
NTKERNELAPI
NTSTATUS
NTAPI
FsRtlGetNextExtraCreateParameter(IN PECP_LIST EcpList,
IN PVOID CurrentEcpContext,
OUT LPGUID NextEcpType OPTIONAL,
OUT PVOID *NextEcpContext,
OUT PULONG NextEcpContextSize OPTIONAL)
{
PECP_HEADER CurrentEntry;
/* If we have no context ... */
if (CurrentEcpContext == NULL)
{
if (IsListEmpty(&EcpList->EcpList))
{
goto FailEmpty;
}
/* Simply consider first entry */
CurrentEntry = CONTAINING_RECORD(EcpList->EcpList.Flink, ECP_HEADER, ListEntry);
}
else
{
/* Otherwise, consider the entry matching the given context */
CurrentEntry = ECP_CONTEXT_TO_HEADER(CurrentEcpContext);
/* Make sure we didn't reach the end */
if (&CurrentEntry->ListEntry == &EcpList->EcpList)
{
goto FailEmpty;
}
}
/* We must have an entry */
if (CurrentEntry == NULL)
{
goto FailEmpty;
}
/* If caller wants a context, give it */
if (NextEcpContext != NULL)
{
*NextEcpContext = ECP_HEADER_TO_CONTEXT(CurrentEntry);
}
/* Same for its size (which the size minus the header overhead) */
if (NextEcpContextSize != NULL)
{
*NextEcpContextSize = CurrentEntry->Size - sizeof(ECP_HEADER);
}
/* And copy the type if asked to */
if (NextEcpType != NULL)
{
RtlCopyMemory(NextEcpType, &CurrentEntry->EcpType, sizeof(GUID));
}
/* Job done */
return STATUS_SUCCESS;
/* Failure case: just zero everything */
FailEmpty:
if (NextEcpContext != NULL)
{
*NextEcpContext = NULL;
}
if (NextEcpContextSize != NULL)
{
*NextEcpContextSize = 0;
}
if (NextEcpType != NULL)
{
RtlZeroMemory(NextEcpType, sizeof(GUID));
}
/* And return failure */
return STATUS_NOT_FOUND;
}