reactos/lib/rossym/zwfile.c

   1 /*
   2  * COPYRIGHT:       See COPYING in the top level directory
   3  * PROJECT:         ReactOS kernel
   4  * FILE:            lib/rossym/zwfile.c
   5  * PURPOSE:         File I/O using native functions
   6  *
   7  * PROGRAMMERS:     Ge van Geldorp (gvg@reactos.com)
   8  */
   9
  10 #define NTOSAPI
  11 #include <wdm.h>
  12 #include <reactos/rossym.h>
  13 #include "rossympriv.h"
  14
  15 BOOLEAN
  16 RosSymZwReadFile(PVOID FileContext, PVOID Buffer, ULONG Size)
  17 {
  18   NTSTATUS Status;
  19   IO_STATUS_BLOCK IoStatusBlock;
  20
  21   Status = ZwReadFile(*((HANDLE *) FileContext),
  22                       0, 0, 0,
  23                       &IoStatusBlock,
  24                       Buffer,
  25                       Size,
  26                       0, 0);
  27
  28   return NT_SUCCESS(Status) && IoStatusBlock.Information == Size;
  29 }
  30
  31 BOOLEAN
  32 RosSymZwSeekFile(PVOID FileContext, ULONG_PTR Position)
  33 {
  34   NTSTATUS Status;
  35   IO_STATUS_BLOCK IoStatusBlock;
  36   FILE_POSITION_INFORMATION NewPosition;
  37
  38   NewPosition.CurrentByteOffset.u.HighPart = 0;
  39   NewPosition.CurrentByteOffset.u.LowPart = Position;
  40   Status = ZwSetInformationFile(*((HANDLE *) FileContext),
  41                                 &IoStatusBlock,
  42                                 (PVOID) &NewPosition,
  43                                 sizeof(FILE_POSITION_INFORMATION),
  44                                 FilePositionInformation);
  45
  46   return NT_SUCCESS(Status);
  47 }