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355 lines
10 KiB
C
355 lines
10 KiB
C
/** @file
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Library functions that perform file IO. Memory buffer, file system, and
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fimrware volume operations are supproted.
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Copyright (c) 2007, Intel Corporation. All rights reserved.<BR>
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Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
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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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Basic support for opening files on different device types. The device string
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is in the form of DevType:Path. Current DevType is required as there is no
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current mounted device concept of current working directory concept implement
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by this library.
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Device names are case insensative and only check the leading characters for
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unique matches. Thus the following are all the same:
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LoadFile0:
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l0:
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L0:
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Lo0:
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Supported Device Names:
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A0x1234:0x12 - A memory buffer starting at address 0x1234 for 0x12 bytes
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l1: - EFI LoadFile device one.
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B0: - EFI BlockIo zero.
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fs3: - EFI Simple File System device 3
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Fv2: - EFI Firmware VOlume device 2
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1.2.3.4:name - TFTP IP and file name
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**/
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#ifndef __EFI_FILE_LIB_H__
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#define __EFI_FILE_LIB_H__
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#include <PiDxe.h>
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#include <Protocol/FirmwareVolume2.h>
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#include <Protocol/FirmwareVolumeBlock.h>
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#include <Protocol/BlockIo.h>
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#include <Protocol/BlockIo2.h>
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#include <Protocol/LoadFile.h>
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#include <Protocol/LoadFile.h>
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#include <Protocol/SimpleFileSystem.h>
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#include <Guid/FileInfo.h>
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#include <Guid/FileSystemInfo.h>
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#define MAX_PATHNAME 0x200
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/// Type of the file that has been opened
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typedef enum {
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EfiOpenLoadFile,
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EfiOpenMemoryBuffer,
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EfiOpenFirmwareVolume,
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EfiOpenFileSystem,
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EfiOpenBlockIo,
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EfiOpenTftp,
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EfiOpenMaxValue,
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EfiOpenBlockIo2
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} EFI_OPEN_FILE_TYPE;
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/// Public information about the open file
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typedef struct {
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UINTN Version; // Common information
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EFI_OPEN_FILE_TYPE Type;
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EFI_DEVICE_PATH_PROTOCOL *DevicePath;
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EFI_STATUS LastError;
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EFI_HANDLE EfiHandle;
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CHAR8 *DeviceName;
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CHAR8 *FileName;
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UINT64 CurrentPosition; // Information for Seek
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UINT64 MaxPosition;
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UINTN BaseOffset; // Base offset for hexdump command
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UINTN Size; // Valid for all types other than l#:
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UINT8 *Buffer; // Information valid for A#:
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EFI_FIRMWARE_VOLUME2_PROTOCOL *Fv; // Information valid for Fv#:
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EFI_GUID FvNameGuid;
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EFI_SECTION_TYPE FvSectionType;
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EFI_FV_FILETYPE FvType;
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EFI_FV_FILE_ATTRIBUTES FvAttributes;
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EFI_PHYSICAL_ADDRESS FvStart;
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UINTN FvSize;
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UINTN FvHeaderSize;
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EFI_FILE *FsFileHandle; // Information valid for Fs#:
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EFI_FILE_SYSTEM_INFO *FsInfo;
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EFI_FILE_INFO *FsFileInfo;
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EFI_BLOCK_IO_MEDIA *FsBlockIoMedia; // Information valid for Fs#: or B#:
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EFI_BLOCK_IO_PROTOCOL *FsBlockIo; // Information valid for Fs#: or B#:
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EFI_BLOCK_IO2_PROTOCOL *FsBlockIo2; // Information valid for Fs#: or B#:
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EFI_BLOCK_IO2_TOKEN FsBlockIo2Token;
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UINTN DiskOffset; // Information valid for B#:
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EFI_LOAD_FILE_PROTOCOL *LoadFile; // Information valid for l#:
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EFI_IP_ADDRESS ServerIp; // Information valid for t:
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BOOLEAN IsDirty;
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BOOLEAN IsBufferValid;
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} EFI_OPEN_FILE;
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/// Type of Seek to perform
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typedef enum {
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EfiSeekStart,
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EfiSeekCurrent,
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EfiSeekEnd,
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EfiSeekMax
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} EFI_SEEK_TYPE;
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/**
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Open a device named by PathName. The PathName includes a device name and
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path separated by a :. See file header for more details on the PathName
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syntax. There is no checking to prevent a file from being opened more than
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one type.
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SectionType is only used to open an FV. Each file in an FV contains multiple
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sections and only the SectionType section is opened.
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For any file that is opened with EfiOpen() must be closed with EfiClose().
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@param PathName Path to parse to open
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@param OpenMode Same as EFI_FILE.Open()
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@param SectionType Section in FV to open.
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@return NULL Open failed
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@return Valid EFI_OPEN_FILE handle
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**/
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EFI_OPEN_FILE *
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EfiOpen (
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IN CHAR8 *PathName,
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IN CONST UINT64 OpenMode,
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IN CONST EFI_SECTION_TYPE SectionType
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);
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EFI_STATUS
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EfiCopyFile (
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IN CHAR8 *DestinationFile,
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IN CHAR8 *SourceFile
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);
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/**
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Use DeviceType and Index to form a valid PathName and try and open it.
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@param DeviceType Device type to open
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@param Index Device Index to use. Zero relative.
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@return NULL Open failed
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@return Valid EFI_OPEN_FILE handle
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**/
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EFI_OPEN_FILE *
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EfiDeviceOpenByType (
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IN EFI_OPEN_FILE_TYPE DeviceType,
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IN UINTN Index
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);
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/**
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Close a file handle opened by EfiOpen() and free all resources allocated by
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EfiOpen().
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@param Stream Open File Handle
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@return EFI_INVALID_PARAMETER Stream is not an Open File
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@return EFI_SUCCESS Steam closed
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**/
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EFI_STATUS
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EfiClose (
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IN EFI_OPEN_FILE *Stream
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);
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/**
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Return the size of the file represented by Stream. Also return the current
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Seek position. Opening a file will enable a valid file size to be returned.
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LoadFile is an exception as a load file size is set to zero.
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@param Stream Open File Handle
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@return 0 Stream is not an Open File or a valid LoadFile handle
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**/
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UINTN
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EfiTell (
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IN EFI_OPEN_FILE *Stream,
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OUT UINT64 *CurrentPosition OPTIONAL
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);
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/**
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Seek to the Offset location in the file. LoadFile and FV device types do
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not support EfiSeek(). It is not possible to grow the file size using
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EfiSeek().
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SeekType defines how use Offset to calculate the new file position:
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EfiSeekStart : Position = Offset
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EfiSeekCurrent: Position is Offset bytes from the current position
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EfiSeekEnd : Only supported if Offset is zero to seek to end of file.
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@param Stream Open File Handle
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@param Offset Offset to seek too.
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@param SeekType Type of seek to perform
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@return EFI_INVALID_PARAMETER Stream is not an Open File
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@return EFI_UNSUPPORTED LoadFile and FV does not support Seek
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@return EFI_NOT_FOUND Seek past the end of the file.
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@return EFI_SUCCESS Steam closed
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**/
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EFI_STATUS
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EfiSeek (
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IN EFI_OPEN_FILE *Stream,
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IN EFI_LBA Offset,
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IN EFI_SEEK_TYPE SeekType
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);
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/**
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Read BufferSize bytes from the current location in the file. For load file
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and FV case you must read the entire file.
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@param Stream Open File Handle
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@param Buffer Caller allocated buffer.
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@param BufferSize Size of buffer in bytes.
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@return EFI_SUCCESS Stream is not an Open File
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@return EFI_END_OF_FILE Tried to read past the end of the file
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@return EFI_INVALID_PARAMETER Stream is not an open file handle
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@return EFI_BUFFER_TOO_SMALL Buffer is not big enough to do the read
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@return "other" Error returned from device read
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**/
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EFI_STATUS
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EfiRead (
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IN EFI_OPEN_FILE *Stream,
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OUT VOID *Buffer,
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OUT UINTN *BufferSize
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);
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/**
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Read the entire file into a buffer. This routine allocates the buffer and
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returns it to the user full of the read data.
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This is very useful for load file where it's hard to know how big the buffer
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must be.
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@param Stream Open File Handle
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@param Buffer Pointer to buffer to return.
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@param BufferSize Pointer to Size of buffer return..
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@return EFI_SUCCESS Stream is not an Open File
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@return EFI_END_OF_FILE Tried to read past the end of the file
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@return EFI_INVALID_PARAMETER Stream is not an open file handle
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@return EFI_BUFFER_TOO_SMALL Buffer is not big enough to do the read
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@return "other" Error returned from device read
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**/
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EFI_STATUS
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EfiReadAllocatePool (
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IN EFI_OPEN_FILE *Stream,
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OUT VOID **Buffer,
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OUT UINTN *BufferSize
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);
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/**
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Write data back to the file.
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@param Stream Open File Handle
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@param Buffer Pointer to buffer to return.
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@param BufferSize Pointer to Size of buffer return..
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@return EFI_SUCCESS Stream is not an Open File
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@return EFI_END_OF_FILE Tried to read past the end of the file
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@return EFI_INVALID_PARAMETER Stream is not an open file handle
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@return EFI_BUFFER_TOO_SMALL Buffer is not big enough to do the read
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@return "other" Error returned from device write
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**/
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EFI_STATUS
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EfiWrite (
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IN EFI_OPEN_FILE *Stream,
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OUT VOID *Buffer,
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OUT UINTN *BufferSize
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);
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/**
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Return the number of devices of the current type active in the system
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@param Type Device type to check
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@return 0 Invalid type
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**/
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UINTN
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EfiGetDeviceCounts (
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IN EFI_OPEN_FILE_TYPE Type
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);
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/**
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Set the Current Working Directory (CWD). If a call is made to EfiOpen () and
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the path does not contain a device name, The CWD is prepended to the path.
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@param Cwd Current Working Directory to set
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@return EFI_SUCCESS CWD is set
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@return EFI_INVALID_PARAMETER Cwd is not a valid device:path
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**/
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EFI_STATUS
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EfiSetCwd (
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IN CHAR8 *Cwd
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);
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/**
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Set the Current Working Directory (CWD). If a call is made to EfiOpen () and
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the path does not contain a device name, The CWD is prepended to the path.
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@param Cwd Current Working Directory
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@return NULL No CWD set
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@return 'other' malloc'ed buffer contains CWD.
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**/
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CHAR8 *
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EfiGetCwd (
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VOID
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);
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#endif
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