BaseTools: Library hashing fix and optimization for --hash feature

[mirror_edk2.git] / FatPkg / EnhancedFatDxe / Delete.c

/** @file\r
  Function that deletes a file.\r
\r
Copyright (c) 2005 - 2013, Intel Corporation. All rights reserved.<BR>\r
SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
\r
**/\r
\r
#include "Fat.h"\r
\r
/**\r
\r
  Deletes the file & Closes the file handle.\r
\r
  @param  FHand                    - Handle to the file to delete.\r
\r
  @retval EFI_SUCCESS              - Delete the file successfully.\r
  @retval EFI_WARN_DELETE_FAILURE  - Fail to delete the file.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
FatDelete (\r
  IN EFI_FILE_PROTOCOL  *FHand\r
  )\r
{\r
  FAT_IFILE   *IFile;\r
  FAT_OFILE   *OFile;\r
  FAT_DIRENT  *DirEnt;\r
  EFI_STATUS  Status;\r
  UINTN       Round;\r
\r
  IFile = IFILE_FROM_FHAND (FHand);\r
  OFile = IFile->OFile;\r
\r
  FatWaitNonblockingTask (IFile);\r
\r
  //\r
  // Lock the volume\r
  //\r
  FatAcquireLock ();\r
\r
  //\r
  // If the file is read-only, then don't delete it\r
  //\r
  if (IFile->ReadOnly) {\r
    Status = EFI_WRITE_PROTECTED;\r
    goto Done;\r
  }\r
  //\r
  // If the file is the root dir, then don't delete it\r
  //\r
  if (OFile->Parent == NULL) {\r
    Status = EFI_ACCESS_DENIED;\r
    goto Done;\r
  }\r
  //\r
  // If the file has a permanant error, skip the delete\r
  //\r
  Status = OFile->Error;\r
  if (!EFI_ERROR (Status)) {\r
    //\r
    // If this is a directory, make sure it's empty before\r
    // allowing it to be deleted\r
    //\r
    if (OFile->ODir != NULL) {\r
      //\r
      // We do not allow to delete nonempty directory\r
      //\r
      FatResetODirCursor (OFile);\r
      for (Round = 0; Round < 3; Round++) {\r
        Status = FatGetNextDirEnt (OFile, &DirEnt);\r
        if ((EFI_ERROR (Status)) ||\r
            ((Round < 2) && (DirEnt == NULL || !FatIsDotDirEnt (DirEnt))) ||\r
            ((Round == 2) && (DirEnt != NULL))\r
            ) {\r
          Status = EFI_ACCESS_DENIED;\r
          goto Done;\r
        }\r
      }\r
    }\r
    //\r
    // Return the file's space by setting its size to 0\r
    //\r
    FatTruncateOFile (OFile, 0);\r
    //\r
    // Free the directory entry for this file\r
    //\r
    Status = FatRemoveDirEnt (OFile->Parent, OFile->DirEnt);\r
    if (EFI_ERROR (Status)) {\r
      goto Done;\r
    }\r
    //\r
    // Set a permanent error for this OFile in case there\r
    // are still opened IFiles attached\r
    //\r
    OFile->Error = EFI_NOT_FOUND;\r
  } else if (OFile->Error == EFI_NOT_FOUND) {\r
    Status = EFI_SUCCESS;\r
  }\r
\r
Done:\r
  //\r
  // Always close the handle\r
  //\r
  FatIFileClose (IFile);\r
  //\r
  // Done\r
  //\r
  Status = FatCleanupVolume (OFile->Volume, NULL, Status, NULL);\r
  FatReleaseLock ();\r
\r
  if (EFI_ERROR (Status)) {\r
    Status = EFI_WARN_DELETE_FAILURE;\r
  }\r
\r
  return Status;\r
}\r