MdeModulePkg FileExplorerLib: Create file explorer library.

This library support select one file from the specified directory or from system root directory.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Samer El-Haj-Mahmoud <elhaj@hpe.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18917 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Include/Library/FileExplorerLib.h

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+/** @file
+
+  This library class defines a set of interfaces for how to do file explorer.
+
+Copyright (c) 2007 - 2015, Intel Corporation. All rights reserved.<BR>
+This program and the accompanying materials are licensed and made available under 
+the terms and conditions of the BSD License that 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.
+
+**/
+
+#ifndef __FILE_EXPLORER_LIB_H__
+#define __FILE_EXPLORER_LIB_H__
+
+/**
+  Prototype for the next process after user chosed one file.
+
+  @param[in] FilePath     The device path of the find file.
+
+  @retval    TRUE         Need exit file explorer after do the extra task.
+  @retval    FALSE        Not need to exit file explorer after do the extra task.
+
+**/
+typedef
+BOOLEAN
+(EFIAPI *CHOOSE_HANDLER)(
+  IN EFI_DEVICE_PATH_PROTOCOL  *FilePath
+  );
+
+/**
+  Choose a file in the specified directory. 
+
+  If user input NULL for the RootDirectory, will choose file in the system.
+
+  If user input *File != NULL, function will return the allocate device path
+  info for the choosed file, caller has to free the memory after use it.
+
+  @param  RootDirectory    Pointer to the root directory.
+  @param  FileType         The file type need to choose.
+  @param  ChooseHandler    Function pointer to the extra task need to do
+                           after choose one file.
+  @param  File             Return the device path for the last time chosed file.
+
+  @retval EFI_SUCESS       Choose the file success.
+  @retval Other errors     Choose the file failed.
+**/
+EFI_STATUS
+EFIAPI
+ChooseFile (
+  IN  EFI_DEVICE_PATH_PROTOCOL  *RootDirectory,
+  IN  CHAR16                    *FileType,  OPTIONAL
+  IN  CHOOSE_HANDLER            ChooseHandler,  OPTIONAL
+  OUT EFI_DEVICE_PATH_PROTOCOL  **File  OPTIONAL
+  );
+
+#endif