reactos/drivers/filesystems/fastfat_new/fullfat.c

   1 /*
   2  * PROJECT:         ReactOS FAT file system driver
   3  * LICENSE:         GPL - See COPYING in the top level directory
   4  * FILE:            drivers/filesystems/fastfat/fullfat.c
   5  * PURPOSE:         FullFAT integration routines
   6  * PROGRAMMERS:     Aleksey Bragin (aleksey@reactos.org)
   7  */
   8
   9 /* INCLUDES *****************************************************************/
  10
  11 #define NDEBUG
  12 #include "fastfat.h"
  13
  14 /* GLOBALS ******************************************************************/
  15
  16 #define TAG_FULLFAT 'FLUF'
  17
  18 /* FUNCTIONS ****************************************************************/
  19
  20 VOID *
  21 FF_Malloc(FF_T_UINT32 allocSize)
  22 {
  23     return ExAllocatePoolWithTag(PagedPool, allocSize, TAG_FULLFAT);
  24 }
  25
  26 VOID
  27 FF_Free(VOID *pBuffer)
  28 {
  29     return ExFreePoolWithTag(pBuffer, TAG_FULLFAT);
  30 }
  31
  32 FF_T_SINT32
  33 FatWriteBlocks(FF_T_UINT8 *pBuffer, FF_T_UINT32 SectorAddress, FF_T_UINT32 Count, void *pParam)
  34 {
  35     DPRINT1("FatWriteBlocks %p %d %d %p\n", pBuffer, SectorAddress, Count, pParam);
  36
  37     return 0;
  38 }
  39
  40 FF_T_SINT32
  41 FatReadBlocks(FF_T_UINT8 *DestBuffer, FF_T_UINT32 SectorAddress, FF_T_UINT32 Count, void *pParam)
  42 {
  43     LARGE_INTEGER Offset;
  44     PVOID Buffer;
  45     PVCB Vcb = (PVCB)pParam;
  46     PBCB Bcb;
  47     ULONG SectorSize = 512; // FIXME: hardcoding 512 is bad
  48
  49     DPRINT("FatReadBlocks %p %d %d %p\n", DestBuffer, SectorAddress, Count, pParam);
  50
  51     /* Calculate the offset */
  52     Offset.QuadPart = Int32x32To64(SectorAddress, SectorSize);
  53
  54     if (!CcMapData(Vcb->StreamFileObject,
  55                   &Offset,
  56                   Count * SectorSize,
  57                   TRUE,
  58                   &Bcb,
  59                   &Buffer))
  60     {
  61         ASSERT(FALSE);
  62         /* Mapping failed */
  63         return 0;
  64     }
  65
  66     /* Copy data to the buffer */
  67     RtlCopyMemory(DestBuffer, Buffer, Count * SectorSize);
  68
  69     /* Unpin unneeded data */
  70     CcUnpinData(Bcb);
  71
  72     /* Return amount of read data in sectors */
  73     return Count;
  74 }
  75
  76 /* EOF */