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fsctl.h: FSP_FSCTL_ALIGN_UP()

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This commit is contained in:
Bill Zissimopoulos 2015-11-27 10:00:14 -08:00
parent d710e7a437
commit 772ca20077
1 changed files with 14 additions and 8 deletions
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22
inc/winfsp/fsctl.h
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@ -19,6 +19,10 @@ extern const __declspec(selectany) GUID FspFsvrtDeviceClassGuid =
#define FSP_FSCTL_DISK_DEVICE_NAME "WinFsp.Disk" #define FSP_FSCTL_DISK_DEVICE_NAME "WinFsp.Disk"
#define FSP_FSCTL_NET_DEVICE_NAME "WinFsp.Net" #define FSP_FSCTL_NET_DEVICE_NAME "WinFsp.Net"
/* alignment macros */
#define FSP_FSCTL_ALIGN_UP(x, s) (((x) + ((s) - 1L)) & ~((s) - 1L))
#define FSP_FSCTL_DEFAULT_ALIGNMENT (sizeof(UINT64) * 2)
/* fsctl device codes */ /* fsctl device codes */
#define FSP_FSCTL_CREATE \ #define FSP_FSCTL_CREATE \
CTL_CODE(FILE_DEVICE_FILE_SYSTEM, 0x800 + 'C', METHOD_BUFFERED, FILE_ANY_ACCESS) CTL_CODE(FILE_DEVICE_FILE_SYSTEM, 0x800 + 'C', METHOD_BUFFERED, FILE_ANY_ACCESS)
@ -31,16 +35,18 @@ extern const __declspec(selectany) GUID FspFsvrtDeviceClassGuid =
#define FSP_FSCTL_CREATE_BUFFER_SIZE 128 #define FSP_FSCTL_CREATE_BUFFER_SIZE 128
#define FSP_FSCTL_TRANSACT_BUFFER_SIZE (16 * 1024) #define FSP_FSCTL_TRANSACT_BUFFER_SIZE (16 * 1024)
#define FSP_FSCTL_TRANSACT_REQ_SIZEMAX (sizeof(FSP_TRANSACT_REQ) + 1024 * sizeof(WCHAR)) #define FSP_FSCTL_TRANSACT_REQ_SIZEMAX \
#define FSP_FSCTL_TRANSACT_RSP_SIZEMAX (sizeof(FSP_TRANSACT_RSP) + 1024 * sizeof(WCHAR)) FSP_FSCTL_ALIGN_UP(sizeof(FSP_TRANSACT_REQ) + 1024 * sizeof(WCHAR), FSP_FSCTL_DEFAULT_ALIGNMENT)
#define FSP_FSCTL_TRANSACT_RSP_SIZEMAX \
FSP_FSCTL_ALIGN_UP(sizeof(FSP_TRANSACT_RSP) + 1024 * sizeof(WCHAR), FSP_FSCTL_DEFAULT_ALIGNMENT)
/* marshalling */ /* marshalling */
#pragma warning(push) #pragma warning(push)
#pragma warning(disable:4200) /* zero-sized array in struct/union */ #pragma warning(disable:4200) /* zero-sized array in struct/union */
typedef struct typedef struct
{ {
UINT32 Size;
UINT64 Hint; UINT64 Hint;
UINT32 Size;
UINT8 Kind; UINT8 Kind;
union union
{ {
@ -49,8 +55,8 @@ typedef struct
} FSP_TRANSACT_REQ; } FSP_TRANSACT_REQ;
typedef struct typedef struct
{ {
UINT32 Size;
UINT64 Hint; UINT64 Hint;
UINT32 Size;
struct struct
{ {
UINT32 Status; UINT32 Status;
@ -66,7 +72,7 @@ typedef struct
static inline FSP_TRANSACT_REQ *FspFsctlTransactProduceRequest( static inline FSP_TRANSACT_REQ *FspFsctlTransactProduceRequest(
FSP_TRANSACT_REQ *Request, SIZE_T RequestSize, PVOID RequestBufEnd) FSP_TRANSACT_REQ *Request, SIZE_T RequestSize, PVOID RequestBufEnd)
{ {
PVOID NextRequest = (PUINT8)Request + RequestSize; PVOID NextRequest = (PUINT8)Request + FSP_FSCTL_ALIGN_UP(RequestSize, FSP_FSCTL_DEFAULT_ALIGNMENT);
return NextRequest <= RequestBufEnd ? NextRequest : 0; return NextRequest <= RequestBufEnd ? NextRequest : 0;
} }
static inline const FSP_TRANSACT_REQ *FspFsctlTransactConsumeRequest( static inline const FSP_TRANSACT_REQ *FspFsctlTransactConsumeRequest(
@ -75,13 +81,13 @@ static inline const FSP_TRANSACT_REQ *FspFsctlTransactConsumeRequest(
if ((PUINT8)Request + sizeof(Request->Size) > (PUINT8)RequestBufEnd || if ((PUINT8)Request + sizeof(Request->Size) > (PUINT8)RequestBufEnd ||
sizeof(FSP_TRANSACT_REQ) > Request->Size) sizeof(FSP_TRANSACT_REQ) > Request->Size)
return 0; return 0;
PVOID NextRequest = (PUINT8)Request + Request->Size; PVOID NextRequest = (PUINT8)Request + FSP_FSCTL_ALIGN_UP(Request->Size, FSP_FSCTL_DEFAULT_ALIGNMENT);
return NextRequest <= RequestBufEnd ? NextRequest : 0; return NextRequest <= RequestBufEnd ? NextRequest : 0;
} }
static inline FSP_TRANSACT_RSP *FspFsctlTransactProduceResponse( static inline FSP_TRANSACT_RSP *FspFsctlTransactProduceResponse(
FSP_TRANSACT_RSP *Response, SIZE_T ResponseSize, PVOID ResponseBufEnd) FSP_TRANSACT_RSP *Response, SIZE_T ResponseSize, PVOID ResponseBufEnd)
{ {
PVOID NextResponse = (PUINT8)Response + ResponseSize; PVOID NextResponse = (PUINT8)Response + FSP_FSCTL_ALIGN_UP(ResponseSize, FSP_FSCTL_DEFAULT_ALIGNMENT);
return NextResponse <= ResponseBufEnd ? NextResponse : 0; return NextResponse <= ResponseBufEnd ? NextResponse : 0;
} }
static inline const FSP_TRANSACT_RSP *FspFsctlTransactConsumeResponse( static inline const FSP_TRANSACT_RSP *FspFsctlTransactConsumeResponse(
@ -90,7 +96,7 @@ static inline const FSP_TRANSACT_RSP *FspFsctlTransactConsumeResponse(
if ((PUINT8)Response + sizeof(Response->Size) > (PUINT8)ResponseBufEnd || if ((PUINT8)Response + sizeof(Response->Size) > (PUINT8)ResponseBufEnd ||
sizeof(FSP_TRANSACT_RSP) > Response->Size) sizeof(FSP_TRANSACT_RSP) > Response->Size)
return 0; return 0;
PVOID NextResponse = (PUINT8)Response + Response->Size; PVOID NextResponse = (PUINT8)Response + FSP_FSCTL_ALIGN_UP(Response->Size, FSP_FSCTL_DEFAULT_ALIGNMENT);
return NextResponse <= ResponseBufEnd ? NextResponse : 0; return NextResponse <= ResponseBufEnd ? NextResponse : 0;
} }