/*++

Copyright (c) 2004, Intel Corporation                                                         
All rights reserved. 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.             

Module Name:

  SimpleFileSystem.h

Abstract:

  SimpleFileSystem protocol as defined in the EFI 1.0 specification.

  The SimpleFileSystem protocol is the programatic access to the FAT (12,16,32) 
  file system specified in EFI 1.0. It can also be used to abstract a file  
  system other than FAT.

  EFI 1.0 can boot from any valid EFI image contained in a SimpleFileSystem
 
--*/

#ifndef _SIMPLE_FILE_SYSTEM_H_
#define _SIMPLE_FILE_SYSTEM_H_

#define EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID \
  { \
    0x964e5b22, 0x6459, 0x11d2, {0x8e, 0x39, 0x0, 0xa0, 0xc9, 0x69, 0x72, 0x3b} \
  }

EFI_FORWARD_DECLARATION (EFI_SIMPLE_FILE_SYSTEM_PROTOCOL);
EFI_FORWARD_DECLARATION (EFI_FILE);

typedef
EFI_STATUS
(EFIAPI *EFI_VOLUME_OPEN) (
  IN EFI_SIMPLE_FILE_SYSTEM_PROTOCOL    * This,
  OUT EFI_FILE                          **Root
  )
/*++

  Routine Description:
    Open the root directory on a volume.

  Arguments:
    This - Protocol instance pointer.
    Root - Returns an Open file handle for the root directory

  Returns:
    EFI_SUCCESS          - The device was opened.
    EFI_UNSUPPORTED      - This volume does not suppor the file system.
    EFI_NO_MEDIA         - The device has no media.
    EFI_DEVICE_ERROR     - The device reported an error.
    EFI_VOLUME_CORRUPTED - The file system structures are corrupted
    EFI_ACCESS_DENIED    - The service denied access to the file
    EFI_OUT_OF_RESOURCES - The volume was not opened due to lack of resources

--*/
;

#define EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_REVISION  0x00010000

struct _EFI_SIMPLE_FILE_SYSTEM_PROTOCOL {
  UINT64          Revision;
  EFI_VOLUME_OPEN OpenVolume;
};

typedef
EFI_STATUS
(EFIAPI *EFI_FILE_OPEN) (
  IN EFI_FILE                 * File,
  OUT EFI_FILE                **NewHandle,
  IN CHAR16                   *FileName,
  IN UINT64                   OpenMode,
  IN UINT64                   Attributes
  )
/*++

  Routine Description:
    Open the root directory on a volume.

  Arguments:
    File       - Protocol instance pointer.
    NewHandle  - Returns File Handle for FileName
    FileName   - Null terminated string. "\", ".", and ".." are supported
    OpenMode   - Open mode for file.
    Attributes - Only used for EFI_FILE_MODE_CREATE

  Returns:
    EFI_SUCCESS          - The device was opened.
    EFI_NOT_FOUND        - The specified file could not be found on the device
    EFI_NO_MEDIA         - The device has no media.
    EFI_MEDIA_CHANGED    - The media has changed
    EFI_DEVICE_ERROR     - The device reported an error.
    EFI_VOLUME_CORRUPTED - The file system structures are corrupted
    EFI_ACCESS_DENIED    - The service denied access to the file
    EFI_OUT_OF_RESOURCES - The volume was not opened due to lack of resources
    EFI_VOLUME_FULL      - The volume is full.

--*/
;

//
// Open modes
//
#define EFI_FILE_MODE_READ    0x0000000000000001
#define EFI_FILE_MODE_WRITE   0x0000000000000002
#define EFI_FILE_MODE_CREATE  0x8000000000000000

//
// File attributes
//
#define EFI_FILE_READ_ONLY  0x0000000000000001
#define EFI_FILE_HIDDEN     0x0000000000000002
#define EFI_FILE_SYSTEM     0x0000000000000004
#define EFI_FILE_RESERVED   0x0000000000000008
#define EFI_FILE_DIRECTORY  0x0000000000000010
#define EFI_FILE_ARCHIVE    0x0000000000000020
#define EFI_FILE_VALID_ATTR 0x0000000000000037

typedef
EFI_STATUS
(EFIAPI *EFI_FILE_CLOSE) (
  IN EFI_FILE  * File
  )
/*++

  Routine Description:
    Close the file handle

  Arguments:
    File       - Protocol instance pointer.

  Returns:
    EFI_SUCCESS- The device was opened.

--*/
;

typedef
EFI_STATUS
(EFIAPI *EFI_FILE_DELETE) (
  IN EFI_FILE  * File
  )
/*++

  Routine Description:
    Close and delete the file handle

  Arguments:
    File       - Protocol instance pointer.

  Returns:
    EFI_SUCCESS             - The device was opened.
    EFI_WARN_DELETE_FAILURE - The handle was closed but the file was not 
                              deleted

--*/
;

typedef
EFI_STATUS
(EFIAPI *EFI_FILE_READ) (
  IN EFI_FILE                 * File,
  IN OUT UINTN                *BufferSize,
  OUT VOID                    *Buffer
  )
/*++

  Routine Description:
    Read data from the file.

  Arguments:
    File       - Protocol instance pointer.
    BufferSize - On input size of buffer, on output amount of data in 
                 buffer.
    Buffer     - The buffer in which data is read.

  Returns:
    EFI_SUCCESS          - Data was read.
    EFI_NO_MEDIA         - The device has no media
    EFI_DEVICE_ERROR     - The device reported an error
    EFI_VOLUME_CORRUPTED - The file system structures are corrupted
    EFI_BUFFER_TO_SMALL  - BufferSize is too small. BufferSize contains 
                           required size

--*/
;

typedef
EFI_STATUS
(EFIAPI *EFI_FILE_WRITE) (
  IN EFI_FILE                 * File,
  IN OUT UINTN                *BufferSize,
  IN VOID                     *Buffer
  )
/*++

  Routine Description:
    Write data from to the file.

  Arguments:
    File       - Protocol instance pointer.
    BufferSize - On input size of buffer, on output amount of data in buffer.
    Buffer     - The buffer in which data to write.

  Returns:
    EFI_SUCCESS          - Data was written.
    EFI_UNSUPPORT        - Writes to Open directory are not supported
    EFI_NO_MEDIA         - The device has no media
    EFI_DEVICE_ERROR     - The device reported an error
    EFI_VOLUME_CORRUPTED - The file system structures are corrupted
    EFI_WRITE_PROTECTED  - The device is write protected
    EFI_ACCESS_DENIED    - The file was open for read only
    EFI_VOLUME_FULL      - The volume is full

--*/
;

typedef
EFI_STATUS
(EFIAPI *EFI_FILE_SET_POSITION) (
  IN EFI_FILE                 * File,
  IN UINT64                   Position
  )
/*++

  Routine Description:
    Set a files current position

  Arguments:
    File     - Protocol instance pointer.
    Position - Byte possition from the start of the file

  Returns:
    EFI_SUCCESS     - Data was written.
    EFI_UNSUPPORTED - Seek request for non-zero is not valid on open.

--*/
;

typedef
EFI_STATUS
(EFIAPI *EFI_FILE_GET_POSITION) (
  IN EFI_FILE                 * File,
  OUT UINT64                  *Position
  )
/*++

  Routine Description:
    Get a files current position

  Arguments:
    File     - Protocol instance pointer.
    Position - Byte possition from the start of the file

  Returns:
    EFI_SUCCESS     - Data was written.
    EFI_UNSUPPORTED - Seek request for non-zero is not valid on open.

--*/
;

typedef
EFI_STATUS
(EFIAPI *EFI_FILE_GET_INFO) (
  IN EFI_FILE                 * File,
  IN EFI_GUID                 * InformationType,
  IN OUT UINTN                *BufferSize,
  OUT VOID                    *Buffer
  )
/*++

  Routine Description:
    Get information about a file

  Arguments:
    File            - Protocol instance pointer.
    InformationType - Type of info to return in Buffer
    BufferSize      - On input size of buffer, on output amount of data in
                      buffer.
    Buffer          - The buffer to return data.

  Returns:
    EFI_SUCCESS          - Data was returned.
    EFI_UNSUPPORT        - InformationType is not supported
    EFI_NO_MEDIA         - The device has no media
    EFI_DEVICE_ERROR     - The device reported an error
    EFI_VOLUME_CORRUPTED - The file system structures are corrupted
    EFI_WRITE_PROTECTED  - The device is write protected
    EFI_ACCESS_DENIED    - The file was open for read only
    EFI_BUFFER_TOO_SMALL - Buffer was too small, required size returned in 
                           BufferSize
--*/
;

typedef
EFI_STATUS
(EFIAPI *EFI_FILE_SET_INFO) (
  IN EFI_FILE                 * File,
  IN EFI_GUID                 * InformationType,
  IN UINTN                    BufferSize,
  IN VOID                     *Buffer
  )
/*++

  Routine Description:
    Set information about a file

  Arguments:
    File            - Protocol instance pointer.
    InformationType - Type of info in Buffer
    BufferSize      - Size of buffer.
    Buffer          - The data to write.

  Returns:
    EFI_SUCCESS          - Data was returned.
    EFI_UNSUPPORT        - InformationType is not supported
    EFI_NO_MEDIA         - The device has no media
    EFI_DEVICE_ERROR     - The device reported an error
    EFI_VOLUME_CORRUPTED - The file system structures are corrupted
    EFI_WRITE_PROTECTED  - The device is write protected
    EFI_ACCESS_DENIED    - The file was open for read only
--*/
;

typedef
EFI_STATUS
(EFIAPI *EFI_FILE_FLUSH) (
  IN EFI_FILE  * File
  )
/*++

  Routine Description:
    Flush data back for the file handle

  Arguments:
    File  - Protocol instance pointer.

  Returns:
    EFI_SUCCESS          - Data was written.
    EFI_UNSUPPORT        - Writes to Open directory are not supported
    EFI_NO_MEDIA         - The device has no media
    EFI_DEVICE_ERROR     - The device reported an error
    EFI_VOLUME_CORRUPTED - The file system structures are corrupted
    EFI_WRITE_PROTECTED  - The device is write protected
    EFI_ACCESS_DENIED    - The file was open for read only
    EFI_VOLUME_FULL      - The volume is full

--*/
;

#define EFI_FILE_HANDLE_REVISION  0x00010000
typedef struct _EFI_FILE {
  UINT64                Revision;
  EFI_FILE_OPEN         Open;
  EFI_FILE_CLOSE        Close;
  EFI_FILE_DELETE       Delete;
  EFI_FILE_READ         Read;
  EFI_FILE_WRITE        Write;
  EFI_FILE_GET_POSITION GetPosition;
  EFI_FILE_SET_POSITION SetPosition;
  EFI_FILE_GET_INFO     GetInfo;
  EFI_FILE_SET_INFO     SetInfo;
  EFI_FILE_FLUSH        Flush;
} *EFI_FILE_HANDLE;

extern EFI_GUID gEfiSimpleFileSystemProtocolGuid;

#endif
