/** @file
Library functions that perform file IO. Memory buffer, file system, and
fimrware volume operations are supproted.
Copyright (c) 2007, Intel Corporation. All rights reserved.<BR>
Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
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.
Basic support for opening files on different device types. The device string
is in the form of DevType:Path. Current DevType is required as there is no
current mounted device concept of current working directory concept implement
by this library.
Device names are case insensative and only check the leading characters for
unique matches. Thus the following are all the same:
LoadFile0:
l0:
L0:
Lo0:
Supported Device Names:
A0x1234:0x12 - A memory buffer starting at address 0x1234 for 0x12 bytes
l1: - EFI LoadFile device one.
B0: - EFI BlockIo zero.
fs3: - EFI Simple File System device 3
Fv2: - EFI Firmware VOlume device 2
1.2.3.4:name - TFTP IP and file name
**/
#ifndef __EFI_FILE_LIB_H__
#define __EFI_FILE_LIB_H__
#include <PiDxe.h>
#include <Protocol/FirmwareVolume2.h>
#include <Protocol/FirmwareVolumeBlock.h>
#include <Protocol/BlockIo.h>
#include <Protocol/LoadFile.h>
#include <Protocol/LoadFile.h>
#include <Protocol/SimpleFileSystem.h>
#include <Guid/FileInfo.h>
#include <Guid/FileSystemInfo.h>
#define MAX_PATHNAME 0x200
/// Type of the file that has been opened
typedef enum {
EfiOpenLoadFile,
EfiOpenMemoryBuffer,
EfiOpenFirmwareVolume,
EfiOpenFileSystem,
EfiOpenBlockIo,
EfiOpenTftp,
EfiOpenMaxValue
} EFI_OPEN_FILE_TYPE;
/// Public information about the open file
typedef struct {
UINTN Version; // Common information
EFI_OPEN_FILE_TYPE Type;
EFI_DEVICE_PATH_PROTOCOL *DevicePath;
EFI_STATUS LastError;
EFI_HANDLE EfiHandle;
CHAR8 *DeviceName;
CHAR8 *FileName;
UINT64 CurrentPosition; // Information for Seek
UINT64 MaxPosition;
UINTN BaseOffset; // Base offset for hexdump command
UINTN Size; // Valid for all types other than l#:
UINT8 *Buffer; // Information valid for A#:
EFI_FIRMWARE_VOLUME2_PROTOCOL *Fv; // Information valid for Fv#:
EFI_GUID FvNameGuid;
EFI_SECTION_TYPE FvSectionType;
EFI_FV_FILETYPE FvType;
EFI_FV_FILE_ATTRIBUTES FvAttributes;
EFI_PHYSICAL_ADDRESS FvStart;
UINTN FvSize;
UINTN FvHeaderSize;
EFI_FILE *FsFileHandle; // Information valid for Fs#:
EFI_FILE_SYSTEM_INFO *FsInfo;
EFI_FILE_INFO *FsFileInfo;
EFI_BLOCK_IO_MEDIA *FsBlockIoMedia; // Information valid for Fs#: or B#:
EFI_BLOCK_IO_PROTOCOL *FsBlockIo; // Information valid for Fs#: or B#:
UINTN DiskOffset; // Information valid for B#:
EFI_LOAD_FILE_PROTOCOL *LoadFile; // Information valid for l#:
EFI_IP_ADDRESS ServerIp; // Information valid for t:
BOOLEAN IsDirty;
BOOLEAN IsBufferValid;
} EFI_OPEN_FILE;
/// Type of Seek to perform
typedef enum {
EfiSeekStart,
EfiSeekCurrent,
EfiSeekEnd,
EfiSeekMax
} EFI_SEEK_TYPE;
/**
Open a device named by PathName. The PathName includes a device name and
path separated by a :. See file header for more details on the PathName
syntax. There is no checking to prevent a file from being opened more than
one type.
SectionType is only used to open an FV. Each file in an FV contains multiple
sections and only the SectionType section is opened.
For any file that is opened with EfiOpen() must be closed with EfiClose().
@param PathName Path to parse to open
@param OpenMode Same as EFI_FILE.Open()
@param SectionType Section in FV to open.
@return NULL Open failed
@return Valid EFI_OPEN_FILE handle
**/
EFI_OPEN_FILE *
EfiOpen (
IN CHAR8 *PathName,
IN CONST UINT64 OpenMode,
IN CONST EFI_SECTION_TYPE SectionType
);
EFI_STATUS
EfiCopyFile (
IN CHAR8 *DestinationFile,
IN CHAR8 *SourceFile
);
/**
Use DeviceType and Index to form a valid PathName and try and open it.
@param DeviceType Device type to open
@param Index Device Index to use. Zero relative.
@return NULL Open failed
@return Valid EFI_OPEN_FILE handle
**/
EFI_OPEN_FILE *
EfiDeviceOpenByType (
IN EFI_OPEN_FILE_TYPE DeviceType,
IN UINTN Index
);
/**
Close a file handle opened by EfiOpen() and free all resources allocated by
EfiOpen().
@param Stream Open File Handle
@return EFI_INVALID_PARAMETER Stream is not an Open File
@return EFI_SUCCESS Steam closed
**/
EFI_STATUS
EfiClose (
IN EFI_OPEN_FILE *Stream
);
/**
Return the size of the file represented by Stream. Also return the current
Seek position. Opening a file will enable a valid file size to be returned.
LoadFile is an exception as a load file size is set to zero.
@param Stream Open File Handle
@return 0 Stream is not an Open File or a valid LoadFile handle
**/
UINTN
EfiTell (
IN EFI_OPEN_FILE *Stream,
OUT UINT64 *CurrentPosition OPTIONAL
);
/**
Seek to the Offset location in the file. LoadFile and FV device types do
not support EfiSeek(). It is not possible to grow the file size using
EfiSeek().
SeekType defines how use Offset to calculate the new file position:
EfiSeekStart : Position = Offset
EfiSeekCurrent: Position is Offset bytes from the current position
EfiSeekEnd : Only supported if Offset is zero to seek to end of file.
@param Stream Open File Handle
@param Offset Offset to seek too.
@param SeekType Type of seek to perform
@return EFI_INVALID_PARAMETER Stream is not an Open File
@return EFI_UNSUPPORTED LoadFile and FV does not support Seek
@return EFI_NOT_FOUND Seek past the end of the file.
@return EFI_SUCCESS Steam closed
**/
EFI_STATUS
EfiSeek (
IN EFI_OPEN_FILE *Stream,
IN EFI_LBA Offset,
IN EFI_SEEK_TYPE SeekType
);
/**
Read BufferSize bytes from the current location in the file. For load file
and FV case you must read the entire file.
@param Stream Open File Handle
@param Buffer Caller allocated buffer.
@param BufferSize Size of buffer in bytes.
@return EFI_SUCCESS Stream is not an Open File
@return EFI_END_OF_FILE Tried to read past the end of the file
@return EFI_INVALID_PARAMETER Stream is not an open file handle
@return EFI_BUFFER_TOO_SMALL Buffer is not big enough to do the read
@return "other" Error returned from device read
**/
EFI_STATUS
EfiRead (
IN EFI_OPEN_FILE *Stream,
OUT VOID *Buffer,
OUT UINTN *BufferSize
);
/**
Read the entire file into a buffer. This routine allocates the buffer and
returns it to the user full of the read data.
This is very useful for load file where it's hard to know how big the buffer
must be.
@param Stream Open File Handle
@param Buffer Pointer to buffer to return.
@param BufferSize Pointer to Size of buffer return..
@return EFI_SUCCESS Stream is not an Open File
@return EFI_END_OF_FILE Tried to read past the end of the file
@return EFI_INVALID_PARAMETER Stream is not an open file handle
@return EFI_BUFFER_TOO_SMALL Buffer is not big enough to do the read
@return "other" Error returned from device read
**/
EFI_STATUS
EfiReadAllocatePool (
IN EFI_OPEN_FILE *Stream,
OUT VOID **Buffer,
OUT UINTN *BufferSize
);
/**
Write data back to the file.
@param Stream Open File Handle
@param Buffer Pointer to buffer to return.
@param BufferSize Pointer to Size of buffer return..
@return EFI_SUCCESS Stream is not an Open File
@return EFI_END_OF_FILE Tried to read past the end of the file
@return EFI_INVALID_PARAMETER Stream is not an open file handle
@return EFI_BUFFER_TOO_SMALL Buffer is not big enough to do the read
@return "other" Error returned from device write
**/
EFI_STATUS
EfiWrite (
IN EFI_OPEN_FILE *Stream,
OUT VOID *Buffer,
OUT UINTN *BufferSize
);
/**
Return the number of devices of the current type active in the system
@param Type Device type to check
@return 0 Invalid type
**/
UINTN
EfiGetDeviceCounts (
IN EFI_OPEN_FILE_TYPE Type
);
/**
Set the Current Working Directory (CWD). If a call is made to EfiOpen () and
the path does not contain a device name, The CWD is prepended to the path.
@param Cwd Current Working Directory to set
@return EFI_SUCCESS CWD is set
@return EFI_INVALID_PARAMETER Cwd is not a valid device:path
**/
EFI_STATUS
EfiSetCwd (
IN CHAR8 *Cwd
);
/**
Set the Current Working Directory (CWD). If a call is made to EfiOpen () and
the path does not contain a device name, The CWD is prepended to the path.
@param Cwd Current Working Directory
@return NULL No CWD set
@return 'other' malloc'ed buffer contains CWD.
**/
CHAR8 *
EfiGetCwd (
VOID
);
#endif