/*++

Copyright (c) 1994  Microsoft Corporation

Module Name:

    NtRxDef.h

Abstract:

    This module defines a whole host of macros that orient the code towards NT
    as opposed to Win9x.

Author:
--*/

#ifndef _RX_NTDEFS_DEFINED_
#define _RX_NTDEFS_DEFINED_

#define INLINE __inline

//
//  from winbase.h:
//

#ifndef INVALID_HANDLE_VALUE
#define INVALID_HANDLE_VALUE ((HANDLE)-1)
#endif //  ifndef INVALID_HANDLE_VALUE

#define RxDeviceType(__xxx) ((DEVICE_TYPE)FILE_DEVICE_##__xxx)

//
//  this macro is used in various places to assist in defining sets of constants
//  that can be used to set/clear/test specific bits in a flags-type field
//

#define RX_DEFINE_FLAG(a,c,d)  a = ((1<<c)&d),

//
//  we need this constant various places
//

#define TICKS_PER_SECOND (10 * 1000 * 1000)
#define TICKS_PER_MILLESECOND (10 * 1000)


#ifndef WRAPPER_CALLS_ONLY
#define RxSprintf sprintf
#endif //  ifndef WRAPPER_CALLS_ONLY

//
//  the next set of macros defines how to get things out of the RxContext; however, RxContext is not
//  a macro parameter; rather, the appropriate pointers are just captured from whatever RxContext happens
//  to be around. Q: "why would you use RxCaptureFcb and then reference thru capFcb instead of just having
//  a macro like RxGetFcb() === RxContext->Fcb?" A: it is done this way to help with optimization. when you make
//  the RxGetFcb() call, the Fcb will have to be reloaded from the RxContext if you have called any procs; however,
//  it will not have to be reloaded with the capture technique.
//

#ifndef MINIRDR__NAME
#define RxCaptureFcb PFCB __C_Fcb = (PFCB)(RxContext->pFcb)
#define RxCaptureFobx PFOBX __C_Fobx = (PFOBX)(RxContext->pFobx)
#else
#define RxCaptureFcb PMRX_FCB __C_Fcb = (RxContext->pFcb)
#define RxCaptureFobx PMRX_FOBX __C_Fobx = (RxContext->pFobx)
#endif

#define RxCaptureRequestPacket PIRP __C_Irp = RxContext->CurrentIrp
#define RxCaptureParamBlock PIO_STACK_LOCATION __C_IrpSp = RxContext->CurrentIrpSp
#define RxCaptureFileObject PFILE_OBJECT __C_FileObject = __C_IrpSp-> FileObject

//
//  the "cap" prefix means "Captured from the RxContext....."; it's ok after you get used to it
//

#define capFcb __C_Fcb
#define capFobx __C_Fobx
#define capPARAMS __C_IrpSp
#define capReqPacket __C_Irp
#define capFileObject __C_FileObject

#define RxAllocatePool ExAllocatePool
#define RxAllocatePoolWithTag ExAllocatePoolWithTag
#define RxFreePool ExFreePool


extern 
NTSTATUS
RxDuplicateString(
    PUNICODE_STRING *Copy,
    PUNICODE_STRING Original,
    POOL_TYPE PoolType
    );

#define RxIsResourceOwnershipStateExclusive(__r) (FlagOn((__r)->Flag, ResourceOwnedExclusive))

#define RxProtectMdlFromFree( Mdl ) {NOTHING;}
#define RxUnprotectMdlFromFree( Mdl ) {NOTHING;}
#define RxMdlIsProtected( Mdl ) (FALSE)
#define RxTakeOwnershipOfMdl( Mdl ) {NOTHING;}
#define RxDisownMdl( Mdl ) {NOTHING;}
#define RxMdlIsOwned( Mdl ) (TRUE)

#define RxAllocateMdl( Buffer, BufferSize ) \
        IoAllocateMdl( Buffer, BufferSize, FALSE, FALSE, NULL )

#define RxMdlIsLocked( Mdl )         ((Mdl)->MdlFlags & MDL_PAGES_LOCKED)
#define RxMdlSourceIsNonPaged( Mdl ) ((Mdl)->MdlFlags & MDL_SOURCE_IS_NONPAGED_POOL)
#define RxMdlIsPartial( Mdl )        ((Mdl)->MdlFlags & MDL_PARTIAL)

#undef RxProbeAndLockPages
#define RxProbeAndLockPages( Mdl, Mode, Access, Status )          \
        Status = STATUS_SUCCESS;                                  \
        try {                                                     \
           MmProbeAndLockPages((Mdl), (Mode), (Access));          \
        } except (EXCEPTION_EXECUTE_HANDLER) {                    \
           Status = GetExceptionCode();                           \
        }

//
//  Macros for dealing with network header MDLs
//

//
//  This is the amount of space we preallocate in front of the smb header to hold
//  transport headers.  This number came from the server.  I suspect it is a worse case
//  value for all the transports that support MDL_NETWORK_HEADER
//

#define TRANSPORT_HEADER_SIZE 128 //  IPX_HEADER_SIZE+MAC_HEADER_SIZE

//
//  Mdls that are marked with the MDL_NETWORK_HEADER flag have extra space allocated before
//  the current start address that can be used for prepending lower-level headers.  The idea
//  is that when we want to prepend another header, we take the current mdl and adjust it to
//  include this extra header at the front of the message.  This is not strictly kosher and relies
//  on the behavior that the page the current header is on, and the page that the prepended header
//  is on, is the same page.  The way the macros work is that if they are not on the same page,
//  we don't set the NETWORK_HEADER flag, and the transport will use a second Mdl for the header.
//
//  Note that the other wierd thing about this is that we don't use the true buffer sizes.  The
//  buffer address is really offset TRANSPORT_HEADER_SIZE into the buffer.  The buffer size passed
//  in the buffer size without the TRANSPORT_HEADER_SIZE included.  Thus if the addition of the
//  TRANSPORT_HEADER_SIZE would cause the Mdl to span an additonal page, this optimization won't
//  work.
//

#define RxInitializeHeaderMdl( Mdl, Va, Len ) {             \
            MmInitializeMdl( Mdl, Va, Len );                \
            if (Mdl->ByteOffset >= TRANSPORT_HEADER_SIZE) { \
                Mdl->MdlFlags |= MDL_NETWORK_HEADER;        \
            }                                               \
        }

#define RxAllocateHeaderMdl( Buffer, BufferSize, Mdl ) {                 \
            Mdl = RxAllocateMdl( Buffer, BufferSize );                   \
            if ((Mdl) && (Mdl->ByteOffset >= TRANSPORT_HEADER_SIZE) ) {  \
                SetFlag( Mdl->MdlFlags, MDL_NETWORK_HEADER );            \
            }                                                            \
        }

#define RxMdlIsHeader( Mdl )    (FlagOn( Mdl )->MdlFlags, MDL_NETWORK_HEADER)

#define RxBuildPartialHeaderMdl( SourceMdl, TargetMdl, Va, Len ) {  \
    IoBuildPartialMdl( SourceMdl, TargetMdl, Va, Len );             \
    if (FlagOn(SourceMdl->MdlFlags, MDL_NETWORK_HEADER ) &&         \
        (TargetMdl->ByteOffset >= TRANSPORT_HEADER_SIZE)) {         \
            SetFlag( TargetMdl->MdlFlags, MDL_NETWORK_HEADER );     \
    }                                                               \
}

#define RxBuildHeaderMdlForNonPagedPool( Mdl) MmBuildMdlForNonPagedPool( Mdl )

#define RxProbeAndLockHeaderPages( Mdl, Mode, Access, Status ) \
         RxProbeAndLockPages( Mdl, Mode, Access, Status )

#define RxUnlockHeaderPages( Mdl ) MmUnlockPages( Mdl )


//
//  the next set of macros defines the prototype and the argument list for the toplevel (Common)
//  routines. these routines are just below the dispatch level and this is where the commonality
//  between win9x and NT begins. In addition, the IN PRX_CONTEXT RxContext and accompanying capture macros
//  could be platform specific as well. We must pass at least the RxContext; but on a RISC machine with
//  lots of registers we could pass a lot more. An adjustment would have to be made in the
//  RxFsdCommonDispatch in this case since the parameters are not yet captured at that point.
//

//
//  the reason why to say "RXSTATUS RxCommonRead (IN PRX_CONTEXT RxContext)" instead
//  of "RxCommon(Read)" is so that the standard tags programs will work. "RxCommon(Read):
//  doesn't look like a procedure definition
//

#define  RXCOMMON_SIGNATURE \
      PRX_CONTEXT RxContext

#define  RXCOMMON_ARGUMENTS \
      RxContext

#define RxGetRequestorProcess( RXCONTEXT ) IoGetRequestorProcess( RXCONTEXT->CurrentIrp )

//
//  RxGetRequestorProcess() returns what IoGetRequestorProcess() returns, which
//  is a pointer to a process structure.  Truncating this to 32 bits does
//  not yield a value that is unique to the process.
//
//  When a 32 bit value that is unique to the process is desired,
//  RxGetRequestorProcessId() must be used instead.
//

#define RxGetRequestorProcessId( RXCONTEXT ) IoGetRequestorProcessId( (RXCONTEXT)->CurrentIrp )

#define RxMarkContextPending( RXCONTEXT ) IoMarkIrpPending( (RXCONTEXT)->CurrentIrp )
                                               
#define RxSetCancelRoutine( Irp, CancelRoutine ) IoSetCancelRoutine( Irp, CancelRoutine );  

//
//  we do this as a macro because we may want to record that we did this adjustment so that
//  people who QFI for standardinfo will be forced to the net to get the right answer and that would
//  probably be better as a routine
//        

#define RxAdjustAllocationSizeforCC( FCB ) {\
        if ((FCB)->Header.FileSize.QuadPart > (FCB)->Header.AllocationSize.QuadPart) {        \
            PMRX_NET_ROOT NetRoot = (FCB)->pNetRoot;                                          \
            ULONGLONG ClusterSize = NetRoot->DiskParameters.ClusterSize;                      \
            ULONGLONG FileSize = (FCB)->Header.FileSize.QuadPart;                             \
            ASSERT(ClusterSize!=0);                                                           \
            (FCB)->Header.AllocationSize.QuadPart = (FileSize+ClusterSize)&~(ClusterSize-1);  \
        }                                                                                     \
        ASSERT ( (FCB)->Header.ValidDataLength.QuadPart <= (FCB)->Header.FileSize.QuadPart ); \
    }


#endif // _RX_NTDEFS_DEFINED_