Function egSaveFile

rEFIt_UEFI/libeg/image.cpp:136–217

if (NULL, ...) then save to EFI partition

}
//if (NULL, ...) then save to EFI partition
EFI_STATUS egSaveFile(IN EFI_FILE_HANDLE BaseDir OPTIONAL, IN CONST CHAR16 *FileName,
                      IN CONST VOID *FileData, IN UINTN FileDataLength)
{
  EFI_STATUS          Status;
  EFI_FILE_HANDLE     FileHandle;
  UINTN               BufferSize;
  BOOLEAN             CreateNew = TRUE;
  CONST CHAR16              *p = FileName + StrLen(FileName);
  CHAR16              DirName[256];
  UINTN               dirNameLen;

  if (BaseDir == NULL) {
    Status = egFindESP(&BaseDir);
    if (EFI_ERROR(Status)) {
      DBG("no ESP %s\n", efiStrError(Status));
      return Status;
    }
  }
    
  // syscl - make directory if not exist
  while (*p != L'\\' && p >= FileName) {
    // find the first '\\' traverse from the end to head of FileName
    p -= 1;
  }
  dirNameLen = p - FileName;
  StrnCpyS(DirName, 256, FileName, dirNameLen);
  DirName[dirNameLen] = L'\0';
  Status = BaseDir->Open(BaseDir, &FileHandle, DirName,
                           EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE, EFI_FILE_DIRECTORY);
    
  if (EFI_ERROR(Status)) {
      // make dir
//    DBG("no dir %s\n", efiStrError(Status));
      Status = BaseDir->Open(BaseDir, &FileHandle, DirName,
                               EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE | EFI_FILE_MODE_CREATE, EFI_FILE_DIRECTORY);
//    DBG("cant make dir %s\n", efiStrError(Status));
  }
  // end of folder checking

  // Delete existing file if it exists
  Status = BaseDir->Open(BaseDir, &FileHandle, FileName,
                         EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE, 0);
  if (!EFI_ERROR(Status)) {
    Status = FileHandle->Delete(FileHandle);
    if (Status == EFI_WARN_DELETE_FAILURE) {
      //This is READ_ONLY file system
      CreateNew = FALSE; // will write into existing file (Slice - ???)
//      DBG("RO FS %s\n", efiStrError(Status));
    }
  }

  if (CreateNew) {
    // Write new file
    Status = BaseDir->Open(BaseDir, &FileHandle, FileName,
                           EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE | EFI_FILE_MODE_CREATE, 0);
    if (EFI_ERROR(Status)) {
//      DBG("no write %s\n", efiStrError(Status));
      return Status;