1 files changed, 119 insertions, 0 deletions
diff --git a/roms/edk2/FatPkg/EnhancedFatDxe/Delete.c b/roms/edk2/FatPkg/EnhancedFatDxe/Delete.c
new file mode 100644
index 000000000..8a437e3ee
--- /dev/null
+++ b/roms/edk2/FatPkg/EnhancedFatDxe/Delete.c
@@ -0,0 +1,119 @@
+/** @file
+  Function that deletes a file.
+
+Copyright (c) 2005 - 2013, Intel Corporation. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+
+**/
+
+#include "Fat.h"
+
+/**
+
+  Deletes the file & Closes the file handle.
+
+  @param  FHand                    - Handle to the file to delete.
+
+  @retval EFI_SUCCESS              - Delete the file successfully.
+  @retval EFI_WARN_DELETE_FAILURE  - Fail to delete the file.
+
+**/
+EFI_STATUS
+EFIAPI
+FatDelete (
+  IN EFI_FILE_PROTOCOL  *FHand
+  )
+{
+  FAT_IFILE   *IFile;
+  FAT_OFILE   *OFile;
+  FAT_DIRENT  *DirEnt;
+  EFI_STATUS  Status;
+  UINTN       Round;
+
+  IFile = IFILE_FROM_FHAND (FHand);
+  OFile = IFile->OFile;
+
+  FatWaitNonblockingTask (IFile);
+
+  //
+  // Lock the volume
+  //
+  FatAcquireLock ();
+
+  //
+  // If the file is read-only, then don't delete it
+  //
+  if (IFile->ReadOnly) {
+    Status = EFI_WRITE_PROTECTED;
+    goto Done;
+  }
+  //
+  // If the file is the root dir, then don't delete it
+  //
+  if (OFile->Parent == NULL) {
+    Status = EFI_ACCESS_DENIED;
+    goto Done;
+  }
+  //
+  // If the file has a permanent error, skip the delete
+  //
+  Status = OFile->Error;
+  if (!EFI_ERROR (Status)) {
+    //
+    // If this is a directory, make sure it's empty before
+    // allowing it to be deleted
+    //
+    if (OFile->ODir != NULL) {
+      //
+      // We do not allow to delete nonempty directory
+      //
+      FatResetODirCursor (OFile);
+      for (Round = 0; Round < 3; Round++) {
+        Status = FatGetNextDirEnt (OFile, &DirEnt);
+        if ((EFI_ERROR (Status)) ||
+            ((Round < 2) && (DirEnt == NULL || !FatIsDotDirEnt (DirEnt))) ||
+            ((Round == 2) && (DirEnt != NULL))
+            ) {
+          Status = EFI_ACCESS_DENIED;
+          goto Done;
+        }
+      }
+    }
+    //
+    // Return the file's space by setting its size to 0
+    //
+    FatTruncateOFile (OFile, 0);
+    //
+    // Free the directory entry for this file
+    //
+    Status = FatRemoveDirEnt (OFile->Parent, OFile->DirEnt);
+    if (EFI_ERROR (Status)) {
+      goto Done;
+    }
+    //
+    // Set a permanent error for this OFile in case there
+    // are still opened IFiles attached
+    //
+    OFile->Error = EFI_NOT_FOUND;
+  } else if (OFile->Error == EFI_NOT_FOUND) {
+    Status = EFI_SUCCESS;
+  }
+
+Done:
+  //
+  // Always close the handle
+  //
+  FatIFileClose (IFile);
+  //
+  // Done
+  //
+  Status = FatCleanupVolume (OFile->Volume, NULL, Status, NULL);
+  FatReleaseLock ();
+
+  if (EFI_ERROR (Status)) {
+    Status = EFI_WARN_DELETE_FAILURE;
+  }
+
+  return Status;
+}