1 files changed, 138 insertions, 0 deletions
diff --git a/FatPkg/EnhancedFatDxe/Delete.c b/FatPkg/EnhancedFatDxe/Delete.c
new file mode 100644
index 0000000000..b76fe45eca
--- /dev/null
+++ b/FatPkg/EnhancedFatDxe/Delete.c
@@ -0,0 +1,138 @@
+/*++
+
+Copyright (c) 2005, Intel Corporation
+All rights reserved. This program and the accompanying materials are licensed and made available
+under the terms and conditions of the BSD License which accompanies this
+distribution. The full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+
+Module Name:
+
+  delete.c
+
+Abstract:
+
+  Function that deletes a file
+
+Revision History
+
+--*/
+
+#include "Fat.h"
+
+EFI_STATUS
+EFIAPI
+FatDelete (
+  IN EFI_FILE  *FHand
+  )
+/*++
+
+Routine Description:
+
+  Deletes the file & Closes the file handle.
+
+Arguments:
+
+  FHand                    - Handle to the file to delete.
+
+Returns:
+
+  EFI_SUCCESS              - Delete the file successfully.
+  EFI_WARN_DELETE_FAILURE  - Fail to delete the file.
+
+--*/
+{
+  FAT_IFILE   *IFile;
+  FAT_OFILE   *OFile;
+  FAT_DIRENT  *DirEnt;
+  EFI_STATUS  Status;
+  UINTN       Round;
+
+  IFile = IFILE_FROM_FHAND (FHand);
+  OFile = IFile->OFile;
+
+  //
+  // 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 permanant 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);
+  FatReleaseLock ();
+
+  if (EFI_ERROR (Status)) {
+    Status = EFI_WARN_DELETE_FAILURE;
+  }
+
+  return Status;
+}