reactos/drivers/filesystems/npfs/fileobsup.c

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/*
* PROJECT: ReactOS Named Pipe FileSystem
* LICENSE: BSD - See COPYING.ARM in the top level directory
* FILE: drivers/filesystems/npfs/fileobsup.c
* PURPOSE: Pipes File Object Support
* PROGRAMMERS: ReactOS Portable Systems Group
*/
/* INCLUDES *******************************************************************/
#include "npfs.h"
// File ID number for NPFS bugchecking support
#define NPFS_BUGCHECK_FILE_ID (NPFS_BUGCHECK_FILEOBSUP)
/* FUNCTIONS ******************************************************************/
NODE_TYPE_CODE
NTAPI
NpDecodeFileObject(IN PFILE_OBJECT FileObject,
OUT PVOID* PrimaryContext OPTIONAL,
OUT PNP_CCB* Ccb,
OUT PULONG NamedPipeEnd OPTIONAL)
{
ULONG_PTR Context;
PNP_CCB Node;
PAGED_CODE();
Context = (ULONG_PTR)FileObject->FsContext;
if ((Context) && (Context != 1))
{
if (NamedPipeEnd) *NamedPipeEnd = Context & 1;
Node = (PVOID)(Context & ~1);
switch (Node->NodeType)
{
case NPFS_NTC_VCB:
return NPFS_NTC_VCB;
case NPFS_NTC_ROOT_DCB:
*Ccb = FileObject->FsContext2;
if (PrimaryContext) *PrimaryContext = Node;
return NPFS_NTC_ROOT_DCB;
case NPFS_NTC_CCB:
*Ccb = Node;
if (PrimaryContext) *PrimaryContext = Node->Fcb;
return NPFS_NTC_CCB;
default:
NpBugCheck(Node->NodeType, 0, 0);
break;
}
}
return 0;
}
VOID
NTAPI
NpSetFileObject(IN PFILE_OBJECT FileObject,
IN PVOID PrimaryContext,
IN PVOID Ccb,
IN ULONG NamedPipeEnd)
{
BOOLEAN FileIsPipe;
PAGED_CODE();
if (!FileObject) return;
if ((PrimaryContext) && (((PNP_CCB)PrimaryContext)->NodeType == NPFS_NTC_CCB))
{
FileIsPipe = TRUE;
if (NamedPipeEnd == FILE_PIPE_SERVER_END)
{
PrimaryContext = (PVOID) ((ULONG_PTR) PrimaryContext | 1);
}
}
else
{
FileIsPipe = FALSE;
}
FileObject->FsContext = PrimaryContext;
FileObject->FsContext2 = Ccb;
FileObject->PrivateCacheMap = (PVOID)1;
if (FileIsPipe) FileObject->Flags |= FO_NAMED_PIPE;
}
/* EOF */