subsystems/ntvdm/utils.c

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