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

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

/** @file\r
  OpenVolume() function of Simple File System Protocol.\r
\r
Copyright (c) 2005 - 2013, Intel Corporation. All rights reserved.<BR>\r
SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include "Fat.h"\r
\r
/**\r
\r
  Implements Simple File System Protocol interface function OpenVolume().\r
\r
  @param  This                  - Calling context.\r
  @param  File                  - the Root Directory of the volume.\r
\r
  @retval EFI_OUT_OF_RESOURCES  - Can not allocate the memory.\r
  @retval EFI_VOLUME_CORRUPTED  - The FAT type is error.\r
  @retval EFI_SUCCESS           - Open the volume successfully.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
FatOpenVolume (\r
  IN  EFI_SIMPLE_FILE_SYSTEM_PROTOCOL  *This,\r
  OUT EFI_FILE_PROTOCOL                **File\r
  )\r
{\r
  EFI_STATUS  Status;\r
  FAT_VOLUME  *Volume;\r
  FAT_IFILE   *IFile;\r
\r
  Volume = VOLUME_FROM_VOL_INTERFACE (This);\r
  FatAcquireLock ();\r
\r
  //\r
  // Open Root file\r
  //\r
  Status = FatOpenDirEnt (NULL, &Volume->RootDirEnt);\r
  if (EFI_ERROR (Status)) {\r
    goto Done;\r
  }\r
  //\r
  // Open a new instance to the root\r
  //\r
  Status = FatAllocateIFile (Volume->Root, &IFile);\r
  if (!EFI_ERROR (Status)) {\r
    *File = &IFile->Handle;\r
  }\r
\r
Done:\r
\r
  Status = FatCleanupVolume (Volume, Volume->Root, Status, NULL);\r
  FatReleaseLock ();\r
\r
  return Status;\r
}\r