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 <ntddk.h>
  12 #include <reactos/rossym.h>
  13 #include "rossympriv.h"
  14
  15 #define NDEBUG
  16 #include <debug.h>
  17
  18 BOOLEAN
  19 RosSymZwReadFile(PVOID FileContext, PVOID Buffer, ULONG Size)
  20 {
  21   NTSTATUS Status;
  22   IO_STATUS_BLOCK IoStatusBlock;
  23
  24   Status = ZwReadFile(*((HANDLE *) FileContext),
  25                       0, 0, 0,
  26                       &IoStatusBlock,
  27                       Buffer,
  28                       Size,
  29                       0, 0);
  30
  31   return NT_SUCCESS(Status) && IoStatusBlock.Information == Size;
  32 }
  33
  34 BOOLEAN
  35 RosSymZwSeekFile(PVOID FileContext, ULONG_PTR Position)
  36 {
  37   NTSTATUS Status;
  38   IO_STATUS_BLOCK IoStatusBlock;
  39   FILE_POSITION_INFORMATION NewPosition;
  40
  41   NewPosition.CurrentByteOffset.u.HighPart = 0;
  42   NewPosition.CurrentByteOffset.u.LowPart = Position;
  43   Status = ZwSetInformationFile(*((HANDLE *) FileContext),
  44                                 &IoStatusBlock,
  45                                 (PVOID) &NewPosition,
  46                                 sizeof(FILE_POSITION_INFORMATION),
  47                                 FilePositionInformation);
  48
  49   return NT_SUCCESS(Status);
  50 }
  51
  52 /* EOF */