Beispiel #1
0
/**

  Open a file for a file name relative to an existing OFile.
  The IFile of the newly opened file is passed out.

  @param  OFile                 - The file that serves as a starting reference point.
  @param  NewIFile              - The newly generated IFile instance.
  @param  FileName              - The file name relative to the OFile.
  @param  OpenMode              - Open mode.
  @param  Attributes            - Attributes to set if the file is created.


  @retval EFI_SUCCESS           - Open the file successfully.
  @retval EFI_INVALID_PARAMETER - The open mode is conflict with the attributes
                          or the file name is not valid.
  @retval EFI_NOT_FOUND         - Conficts between dir intention and attribute.
  @retval EFI_WRITE_PROTECTED   - Can't open for write if the volume is read only.
  @retval EFI_ACCESS_DENIED     - If the file's attribute is read only, and the
                          open is for read-write fail it.
  @retval EFI_OUT_OF_RESOURCES  - Can not allocate the memory.

**/
EFI_STATUS
FatOFileOpen (
  IN  FAT_OFILE            *OFile,
  OUT FAT_IFILE            **NewIFile,
  IN  CHAR16               *FileName,
  IN  UINT64               OpenMode,
  IN  UINT8                Attributes
  )
{
  FAT_VOLUME  *Volume;
  EFI_STATUS  Status;
  CHAR16      NewFileName[EFI_PATH_STRING_LENGTH];
  FAT_DIRENT  *DirEnt;
  UINT8       FileAttributes;
  BOOLEAN     WriteMode;

  DirEnt = NULL;
  Volume = OFile->Volume;
  ASSERT_VOLUME_LOCKED (Volume);
  WriteMode = (BOOLEAN) (OpenMode & EFI_FILE_MODE_WRITE);
  if (Volume->ReadOnly && WriteMode) {
    return EFI_WRITE_PROTECTED;
  }
  //
  // Verify the source file handle isn't in an error state
  //
  Status = OFile->Error;
  if (EFI_ERROR (Status)) {
    return Status;
  }
  //
  // Get new OFile for the file
  //
  Status = FatLocateOFile (&OFile, FileName, Attributes, NewFileName);
  if (EFI_ERROR (Status)) {
    return Status;
  }

  if (*NewFileName != 0) {
    //
    // If there's a remaining part of the name, then we had
    // better be creating the file in the directory
    //
    if ((OpenMode & EFI_FILE_MODE_CREATE) == 0) {
      return EFI_NOT_FOUND;
    }

    Status = FatCreateDirEnt (OFile, NewFileName, Attributes, &DirEnt);
    if (EFI_ERROR (Status)) {
      return Status;
    }

    ASSERT (DirEnt != NULL);
    Status = FatOpenDirEnt (OFile, DirEnt);
    if (EFI_ERROR (Status)) {
      return Status;
    }

    OFile = DirEnt->OFile;
    if (OFile->ODir != NULL) {
      //
      // If we just created a directory, we need to create "." and ".."
      //
      Status = FatCreateDotDirEnts (OFile);
      if (EFI_ERROR (Status)) {
        return Status;
      }
    }
  }
  //
  // If the file's attribute is read only, and the open is for
  // read-write, then the access is denied.
  //
  FileAttributes = OFile->DirEnt->Entry.Attributes;
  if ((FileAttributes & EFI_FILE_READ_ONLY) != 0 && (FileAttributes & FAT_ATTRIBUTE_DIRECTORY) == 0 && WriteMode) {
    return EFI_ACCESS_DENIED;
  }
  //
  // Create an open instance of the OFile
  //
  Status = FatAllocateIFile (OFile, NewIFile);
  if (EFI_ERROR (Status)) {
    return Status;
  }

  (*NewIFile)->ReadOnly = (BOOLEAN)!WriteMode;

  DEBUG ((EFI_D_INFO, "FSOpen: Open '%S' %r\n", FileName, Status));
  return FatOFileFlush (OFile);
}
Beispiel #2
0
EFI_STATUS
FatOFileOpen (
  IN  FAT_OFILE            *OFile,
  OUT FAT_IFILE            **NewIFile,
  IN  CHAR16               *FileName,
  IN  UINT64               OpenMode,
  IN  UINT8                Attributes
  )
/*++

Routine Description:

  Open a file for a file name relative to an existing OFile.
  The IFile of the newly opened file is passed out.

Arguments:

  OFile                 - The file that serves as a starting reference point.
  NewIFile              - The newly generated IFile instance.
  FileName              - The file name relative to the OFile.
  OpenMode              - Open mode.
  Attributes            - Attributes to set if the file is created.

Returns:

  EFI_SUCCESS           - Open the file successfully.
  EFI_INVALID_PARAMETER - The open mode is conflict with the attributes
                          or the file name is not valid.
  EFI_NOT_FOUND         - Conficts between dir intention and attribute.
  EFI_WRITE_PROTECTED   - Can't open for write if the volume is read only.
  EFI_ACCESS_DENIED     - If the file's attribute is read only, and the
                          open is for read-write fail it.
  EFI_OUT_OF_RESOURCES  - Can not allocate the memory.

--*/
{
  FAT_VOLUME  *Volume;
  EFI_STATUS  Status;
  CHAR16      NewFileName[EFI_PATH_STRING_LENGTH];
  FAT_DIRENT  *DirEnt;
  UINT8       FileAttributes;
  BOOLEAN     WriteMode;

  DirEnt = NULL;
  Volume = OFile->Volume;
  ASSERT_VOLUME_LOCKED (Volume);
  WriteMode = (BOOLEAN) (OpenMode & EFI_FILE_MODE_WRITE);
  if (Volume->ReadOnly && WriteMode) {
    return EFI_WRITE_PROTECTED;
  }
  //
  // Verify the source file handle isn't in an error state
  //
  Status = OFile->Error;
  if (EFI_ERROR (Status)) {
    return Status;
  }
  //
  // Get new OFile for the file
  //
  Status = FatLocateOFile (&OFile, FileName, Attributes, NewFileName);
  if (EFI_ERROR (Status)) {
    return Status;
  }

  if (*NewFileName != 0) {
    //
    // If there's a remaining part of the name, then we had
    // better be creating the file in the directory
    //
    if ((OpenMode & EFI_FILE_MODE_CREATE) == 0) {
      return EFI_NOT_FOUND;
    }

    Status = FatCreateDirEnt (OFile, NewFileName, Attributes, &DirEnt);
    if (EFI_ERROR (Status)) {
      return Status;
    }

    ASSERT (DirEnt != NULL);
    Status = FatOpenDirEnt (OFile, DirEnt);
    if (EFI_ERROR (Status)) {
      return Status;
    }

    OFile = DirEnt->OFile;
    if (OFile->ODir != NULL) {
      //
      // If we just created a directory, we need to create "." and ".."
      //
      Status = FatCreateDotDirEnts (OFile);
      if (EFI_ERROR (Status)) {
        return Status;
      }
    }
  }
  //
  // If the file's attribute is read only, and the open is for
  // read-write, then the access is denied.
  //
  FileAttributes = OFile->DirEnt->Entry.Attributes;
  if ((FileAttributes & EFI_FILE_READ_ONLY) != 0 && (FileAttributes & FAT_ATTRIBUTE_DIRECTORY) == 0 && WriteMode) {
    return EFI_ACCESS_DENIED;
  }
  //
  // Create an open instance of the OFile
  //
  Status = FatAllocateIFile (OFile, NewIFile);
  if (EFI_ERROR (Status)) {
    return Status;
  }

  (*NewIFile)->ReadOnly = (BOOLEAN)!WriteMode;

  DEBUG ((EFI_D_INFO, "FSOpen: Open '%S' %r\n", FileName, Status));
  return FatOFileFlush (OFile);
}