mirror of
https://github.com/acidanthera/OpenCorePkg.git
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116 lines
3.3 KiB
C
Executable File
116 lines
3.3 KiB
C
Executable File
/** @file
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Copyright (C) 2016, The HermitCrabs Lab. All rights reserved.
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All rights reserved.
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <Uefi.h>
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#include <Guid/FileInfo.h>
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#include <Protocol/SimpleFileSystem.h>
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#include <Library/BaseLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/DebugLib.h>
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#include <Library/DevicePathLib.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Library/OcDevicePathLib.h>
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#include <Library/OcFileLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Library/UefiLib.h>
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#include "OcFileLibInternal.h"
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// OpenDirectory
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/** Read file from device path
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Open
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EFI_FILE_MODE_READ
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Create
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(EFI_FILE_MODE_CREATE | EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE)
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@param[in] DevicePath The whole device path to the file.
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@param[out] FileSize The size of the file read or 0
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@retval A pointer to a buffer containing the file read or NULL
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**/
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EFI_STATUS
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OpenDirectory (
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IN EFI_DEVICE_PATH_PROTOCOL *DevicePath,
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IN CHAR16 *DirectoryPath,
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IN UINT64 Mode,
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IN UINT64 Attributes,
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OUT EFI_FILE **DirectoryHandle OPTIONAL
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)
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{
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EFI_STATUS Status;
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EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *FileSystem;
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EFI_FILE *FileSystemRoot;
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EFI_FILE *Directory;
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Status = EFI_INVALID_PARAMETER;
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if ((DevicePath != NULL) && (DirectoryPath != NULL)) {
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// Open the Filesystem on our DeviceHandle.
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FileSystem = NULL;
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Status = OpenFileSystem (
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&DevicePath,
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&FileSystem
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);
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if (!EFI_ERROR (Status)) {
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// We neeed to open the target volume to be able to load files from it.
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// What we get is the filesystem root. This function also has to be called
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// if any further calls to FileSystem return EFI_MEDIA_CHANGED to indicate
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// that our volume has changed.
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do {
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FileSystemRoot = NULL;
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Status = FileSystem->OpenVolume (FileSystem, &FileSystemRoot);
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if (EFI_ERROR (Status)) {
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DEBUG ((DEBUG_ERROR, "Could not open the file system - %r\n", Status));
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break;
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}
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// Now we can try to open the target file on our filesystem.
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Directory = NULL;
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Status = FileSystemRoot->Open (
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FileSystemRoot,
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&Directory,
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DirectoryPath,
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Mode,
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(Attributes | EFI_FILE_DIRECTORY)
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);
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if (!EFI_ERROR (Status)) {
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break;
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}
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} while (Status == EFI_MEDIA_CHANGED);
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}
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if (DirectoryHandle != NULL) {
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*DirectoryHandle = Directory;
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} else {
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Directory->Close (Directory);
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}
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}
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return Status;
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}
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