drivers/filesystems/npfs/fileobsup.c

   1 /*
   2  * PROJECT:     ReactOS Named Pipe FileSystem
   3  * LICENSE:     BSD - See COPYING.ARM in the top level directory
   4  * FILE:        drivers/filesystems/npfs/fileobsup.c
   5  * PURPOSE:     Pipes File Object Support
   6  * PROGRAMMERS: ReactOS Portable Systems Group
   7  */
   8
   9 /* INCLUDES *******************************************************************/
  10
  11 #include "npfs.h"
  12
  13 // File ID number for NPFS bugchecking support
  14 #define NPFS_BUGCHECK_FILE_ID   (NPFS_BUGCHECK_FILEOBSUP)
  15
  16 /* FUNCTIONS ******************************************************************/
  17
  18 NODE_TYPE_CODE
  19 NTAPI
  20 NpDecodeFileObject(IN PFILE_OBJECT FileObject,
  21                    OUT PVOID* PrimaryContext OPTIONAL,
  22                    OUT PNP_CCB* Ccb,
  23                    OUT PULONG NamedPipeEnd OPTIONAL)
  24 {
  25     ULONG_PTR Context;
  26     PNP_CCB Node;
  27     PAGED_CODE();
  28
  29     Context = (ULONG_PTR)FileObject->FsContext;
  30     if ((Context) && (Context != 1))
  31     {
  32         if (NamedPipeEnd) *NamedPipeEnd = Context & 1;
  33
  34         Node = (PVOID)(Context & ~1);
  35
  36         switch (Node->NodeType)
  37         {
  38             case NPFS_NTC_VCB:
  39                 return NPFS_NTC_VCB;
  40
  41             case NPFS_NTC_ROOT_DCB:
  42                 *Ccb = FileObject->FsContext2;
  43                 if (PrimaryContext) *PrimaryContext = Node;
  44                 return NPFS_NTC_ROOT_DCB;
  45
  46             case NPFS_NTC_CCB:
  47                 *Ccb = Node;
  48                 if (PrimaryContext) *PrimaryContext = Node->Fcb;
  49                 return NPFS_NTC_CCB;
  50
  51             default:
  52                 NpBugCheck(Node->NodeType, 0, 0);
  53                 break;
  54             }
  55     }
  56
  57     return 0;
  58 }
  59
  60 VOID
  61 NTAPI
  62 NpSetFileObject(IN PFILE_OBJECT FileObject,
  63                 IN PVOID PrimaryContext,
  64                 IN PVOID Ccb,
  65                 IN ULONG NamedPipeEnd)
  66 {
  67     BOOLEAN FileIsPipe;
  68     PAGED_CODE();
  69
  70     if (!FileObject) return;
  71
  72     if ((PrimaryContext) && (((PNP_CCB)PrimaryContext)->NodeType == NPFS_NTC_CCB))
  73     {
  74         FileIsPipe = TRUE;
  75         if (NamedPipeEnd == FILE_PIPE_SERVER_END)
  76         {
  77             PrimaryContext = (PVOID) ((ULONG_PTR) PrimaryContext | 1);
  78         }
  79     }
  80     else
  81     {
  82         FileIsPipe = FALSE;
  83     }
  84
  85     FileObject->FsContext = PrimaryContext;
  86     FileObject->FsContext2 = Ccb;
  87     FileObject->PrivateCacheMap = (PVOID)1;
  88     if (FileIsPipe) FileObject->Flags |= FO_NAMED_PIPE;
  89 }
  90
  91 /* EOF */