reactos/subsystems/mvdm/ntvdm/utils.c

   1 /*
   2  * COPYRIGHT:       GPL - See COPYING in the top level directory
   3  * PROJECT:         ReactOS Virtual DOS Machine
   4  * FILE:            subsystems/mvdm/ntvdm/utils.c
   5  * PURPOSE:         Utility Functions
   6  * PROGRAMMERS:     Hermes Belusca-Maito (hermes.belusca@sfr.fr)
   7  */
   8
   9 /* INCLUDES *******************************************************************/
  10
  11 #include "ntvdm.h"
  12
  13 #define NDEBUG
  14 #include <debug.h>
  15
  16 /* PRIVATE FUNCTIONS **********************************************************/
  17
  18 /* PUBLIC FUNCTIONS ***********************************************************/
  19
  20 VOID
  21 FileClose(IN HANDLE FileHandle)
  22 {
  23     CloseHandle(FileHandle);
  24 }
  25
  26 HANDLE
  27 FileOpen(IN  PCSTR  FileName,
  28          OUT PULONG FileSize OPTIONAL)
  29 {
  30     HANDLE hFile;
  31     ULONG  ulFileSize;
  32
  33     /* Open the file */
  34     SetLastError(0); // For debugging purposes
  35     hFile = CreateFileA(FileName,
  36                         GENERIC_READ,
  37                         FILE_SHARE_READ,
  38                         NULL,
  39                         OPEN_EXISTING,
  40                         FILE_ATTRIBUTE_NORMAL,
  41                         NULL);
  42     DPRINT1("File '%s' opening %s ; GetLastError() = %u\n",
  43             FileName, hFile != INVALID_HANDLE_VALUE ? "succeeded" : "failed", GetLastError());
  44
  45     /* If we failed, bail out */
  46     if (hFile == INVALID_HANDLE_VALUE) return NULL;
  47
  48     /* OK, we have a handle to the file */
  49
  50     /*
  51      * Retrieve the size of the file. In NTVDM we will handle files
  52      * of maximum 1Mb so we can largely use GetFileSize only.
  53      */
  54     ulFileSize = GetFileSize(hFile, NULL);
  55     if (ulFileSize == INVALID_FILE_SIZE && GetLastError() != ERROR_SUCCESS)
  56     {
  57         /* We failed, bail out */
  58         DPRINT1("Error when retrieving file size, or size too large (%d)\n", ulFileSize);
  59         FileClose(hFile);
  60         return NULL;
  61     }
  62
  63     /* Success, return file handle and size if needed */
  64     if (FileSize) *FileSize = ulFileSize;
  65     return hFile;
  66 }
  67
  68 BOOLEAN
  69 FileLoadByHandle(IN  HANDLE FileHandle,
  70                  IN  PVOID  Location,
  71                  IN  ULONG  FileSize,
  72                  OUT PULONG BytesRead)
  73 {
  74     BOOLEAN Success;
  75
  76     /* Attempt to load the file into memory */
  77     SetLastError(0); // For debugging purposes
  78     Success = !!ReadFile(FileHandle,
  79                          Location, // REAL_TO_PHYS(LocationRealPtr),
  80                          FileSize,
  81                          BytesRead,
  82                          NULL);
  83     DPRINT1("File loading %s ; GetLastError() = %u\n", Success ? "succeeded" : "failed", GetLastError());
  84
  85     return Success;
  86 }
  87
  88 /* EOF */