text: /** @file
    EFI Multicast Trivial File Transfer Protocol Definition
  
  Copyright (c) 2006 - 2018, 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.
  
    @par Revision Reference:
    This Protocol is introduced in UEFI Specification 2.0
  
  **/
  
  #ifndef __EFI_MTFTP4_PROTOCOL_H__
  #define __EFI_MTFTP4_PROTOCOL_H__
  
  #define EFI_MTFTP4_SERVICE_BINDING_PROTOCOL_GUID \
    { \
      0x2FE800BE, 0x8F01, 0x4aa6, {0x94, 0x6B, 0xD7, 0x13, 0x88, 0xE1, 0x83, 0x3F } \
    }
  
  #define EFI_MTFTP4_PROTOCOL_GUID \
    { \
      0x78247c57, 0x63db, 0x4708, {0x99, 0xc2, 0xa8, 0xb4, 0xa9, 0xa6, 0x1f, 0x6b } \
    }
  
  typedef struct _EFI_MTFTP4_PROTOCOL EFI_MTFTP4_PROTOCOL;
  typedef struct _EFI_MTFTP4_TOKEN EFI_MTFTP4_TOKEN;
  
  //
  //MTFTP4 packet opcode definition
  //
  #define EFI_MTFTP4_OPCODE_RRQ                     1
  #define EFI_MTFTP4_OPCODE_WRQ                     2
  #define EFI_MTFTP4_OPCODE_DATA                    3
  #define EFI_MTFTP4_OPCODE_ACK                     4
  #define EFI_MTFTP4_OPCODE_ERROR                   5
  #define EFI_MTFTP4_OPCODE_OACK                    6
  #define EFI_MTFTP4_OPCODE_DIR                     7
  #define EFI_MTFTP4_OPCODE_DATA8                   8
  #define EFI_MTFTP4_OPCODE_ACK8                    9
  
  //
  // MTFTP4 error code definition
  //
  #define EFI_MTFTP4_ERRORCODE_NOT_DEFINED          0
  #define EFI_MTFTP4_ERRORCODE_FILE_NOT_FOUND       1
  #define EFI_MTFTP4_ERRORCODE_ACCESS_VIOLATION     2
  #define EFI_MTFTP4_ERRORCODE_DISK_FULL            3
  #define EFI_MTFTP4_ERRORCODE_ILLEGAL_OPERATION    4
  #define EFI_MTFTP4_ERRORCODE_UNKNOWN_TRANSFER_ID  5
  #define EFI_MTFTP4_ERRORCODE_FILE_ALREADY_EXISTS  6
  #define EFI_MTFTP4_ERRORCODE_NO_SUCH_USER         7
  #define EFI_MTFTP4_ERRORCODE_REQUEST_DENIED       8
  
  //
  // MTFTP4 pacekt definitions
  //
  #pragma pack(1)
  
  typedef struct {
    UINT16                  OpCode;
    UINT8                   Filename[1];
  } EFI_MTFTP4_REQ_HEADER;
  
  typedef struct {
    UINT16                  OpCode;
    UINT8                   Data[1];
  } EFI_MTFTP4_OACK_HEADER;
  
  typedef struct {
    UINT16                  OpCode;
    UINT16                  Block;
    UINT8                   Data[1];
  } EFI_MTFTP4_DATA_HEADER;
  
  typedef struct {
    UINT16                  OpCode;
    UINT16                  Block[1];
  } EFI_MTFTP4_ACK_HEADER;
  
  typedef struct {
    UINT16                  OpCode;
    UINT64                  Block;
    UINT8                   Data[1];
  } EFI_MTFTP4_DATA8_HEADER;
  
  typedef struct {
    UINT16                  OpCode;
    UINT64                  Block[1];
  } EFI_MTFTP4_ACK8_HEADER;
  
  typedef struct {
    UINT16                  OpCode;
    UINT16                  ErrorCode;
    UINT8                   ErrorMessage[1];
  } EFI_MTFTP4_ERROR_HEADER;
  
  typedef union {
    ///
    /// Type of packets as defined by the MTFTPv4 packet opcodes.
    ///
    UINT16                  OpCode;
    ///
    /// Read request packet header.
    ///
    EFI_MTFTP4_REQ_HEADER   Rrq;
    ///
    /// Write request packet header.
    ///
    EFI_MTFTP4_REQ_HEADER   Wrq;
    ///
    /// Option acknowledge packet header.
    ///
    EFI_MTFTP4_OACK_HEADER  Oack;
    ///
    /// Data packet header.
    ///
    EFI_MTFTP4_DATA_HEADER  Data;
    ///
    /// Acknowledgement packet header.
    ///
    EFI_MTFTP4_ACK_HEADER   Ack;
    ///
    /// Data packet header with big block number.
    ///
    EFI_MTFTP4_DATA8_HEADER Data8;
    ///
    /// Acknowledgement header with big block num.
    ///
    EFI_MTFTP4_ACK8_HEADER  Ack8;
    ///
    /// Error packet header.
    ///
    EFI_MTFTP4_ERROR_HEADER Error;
  } EFI_MTFTP4_PACKET;
  
  #pragma pack()
  
  ///
  /// MTFTP4 option definition.
  ///
  typedef struct {
    UINT8                   *OptionStr;
    UINT8                   *ValueStr;
  } EFI_MTFTP4_OPTION;
  
  
  typedef struct {
    BOOLEAN                 UseDefaultSetting;
    EFI_IPv4_ADDRESS        StationIp;
    EFI_IPv4_ADDRESS        SubnetMask;
    UINT16                  LocalPort;
    EFI_IPv4_ADDRESS        GatewayIp;
    EFI_IPv4_ADDRESS        ServerIp;
    UINT16                  InitialServerPort;
    UINT16                  TryCount;
    UINT16                  TimeoutValue;
  } EFI_MTFTP4_CONFIG_DATA;
  
  
  typedef struct {
    EFI_MTFTP4_CONFIG_DATA  ConfigData;
    UINT8                   SupportedOptionCount;
    UINT8                   **SupportedOptoins;
    UINT8                   UnsupportedOptionCount;
    UINT8                   **UnsupportedOptoins;
  } EFI_MTFTP4_MODE_DATA;
  
  
  typedef struct {
    EFI_IPv4_ADDRESS        GatewayIp;
    EFI_IPv4_ADDRESS        ServerIp;
    UINT16                  ServerPort;
    UINT16                  TryCount;
    UINT16                  TimeoutValue;
  } EFI_MTFTP4_OVERRIDE_DATA;
  
  //
  // Protocol interfaces definition
  //
  
  /**
    A callback function that is provided by the caller to intercept
    the EFI_MTFTP4_OPCODE_DATA or EFI_MTFTP4_OPCODE_DATA8 packets processed in the
    EFI_MTFTP4_PROTOCOL.ReadFile() function, and alternatively to intercept
    EFI_MTFTP4_OPCODE_OACK or EFI_MTFTP4_OPCODE_ERROR packets during a call to
    EFI_MTFTP4_PROTOCOL.ReadFile(), WriteFile() or ReadDirectory().
  
    @param  This        The pointer to the EFI_MTFTP4_PROTOCOL instance.
    @param  Token       The token that the caller provided in the
                        EFI_MTFTP4_PROTOCOL.ReadFile(), WriteFile()
                        or ReadDirectory() function.
    @param  PacketLen   Indicates the length of the packet.
    @param  Packet      The pointer to an MTFTPv4 packet.
  
    @retval EFI_SUCCESS The operation was successful.
    @retval Others      Aborts the transfer process.
  
  **/
  typedef
  EFI_STATUS
  (EFIAPI *EFI_MTFTP4_CHECK_PACKET)(
    IN EFI_MTFTP4_PROTOCOL  *This,
    IN EFI_MTFTP4_TOKEN     *Token,
    IN UINT16               PacketLen,
    IN EFI_MTFTP4_PACKET    *Paket
    );
  
  /**
    Timeout callback function.
  
    @param  This           The pointer to the EFI_MTFTP4_PROTOCOL instance.
    @param  Token          The token that is provided in the
                           EFI_MTFTP4_PROTOCOL.ReadFile() or
                           EFI_MTFTP4_PROTOCOL.WriteFile() or
                           EFI_MTFTP4_PROTOCOL.ReadDirectory() functions
                           by the caller.
  
    @retval EFI_SUCCESS   The operation was successful.
    @retval Others        Aborts download process.
  
  **/
  typedef
  EFI_STATUS
  (EFIAPI *EFI_MTFTP4_TIMEOUT_CALLBACK)(
    IN EFI_MTFTP4_PROTOCOL  *This,
    IN EFI_MTFTP4_TOKEN     *Token
    );
  
  /**
    A callback function that the caller provides to feed data to the
    EFI_MTFTP4_PROTOCOL.WriteFile() function.
  
    @param  This   The pointer to the EFI_MTFTP4_PROTOCOL instance.
    @param  Token  The token provided in the
                   EFI_MTFTP4_PROTOCOL.WriteFile() by the caller.
    @param  Length Indicates the length of the raw data wanted on input, and the
                   length the data available on output.
    @param  Buffer The pointer to the buffer where the data is stored.
  
    @retval EFI_SUCCESS The operation was successful.
    @retval Others      Aborts session.
  
  **/
  typedef
  EFI_STATUS
  (EFIAPI *EFI_MTFTP4_PACKET_NEEDED)(
    IN  EFI_MTFTP4_PROTOCOL *This,
    IN  EFI_MTFTP4_TOKEN    *Token,
    IN  OUT UINT16          *Length,
    OUT VOID                **Buffer
    );
  
  
  /**
    Submits an asynchronous interrupt transfer to an interrupt endpoint of a USB device.
  
    @param  This     The pointer to the EFI_MTFTP4_PROTOCOL instance.
    @param  ModeData The pointer to storage for the EFI MTFTPv4 Protocol driver mode data.
  
    @retval EFI_SUCCESS           The configuration data was successfully returned.
    @retval EFI_OUT_OF_RESOURCES  The required mode data could not be allocated.
    @retval EFI_INVALID_PARAMETER This is NULL or ModeData is NULL.
  
  **/
  typedef
  EFI_STATUS
  (EFIAPI *EFI_MTFTP4_GET_MODE_DATA)(
    IN  EFI_MTFTP4_PROTOCOL     *This,
    OUT EFI_MTFTP4_MODE_DATA    *ModeData
    );
  
  
  /**
    Initializes, changes, or resets the default operational setting for this
    EFI MTFTPv4 Protocol driver instance.
  
    @param  This            The pointer to the EFI_MTFTP4_PROTOCOL instance.
    @param  MtftpConfigData The pointer to the configuration data structure.
  
    @retval EFI_SUCCESS           The EFI MTFTPv4 Protocol driver was configured successfully.
    @retval EFI_INVALID_PARAMETER One or more parameters are invalid.
    @retval EFI_ACCESS_DENIED     The EFI configuration could not be changed at this time because
                                  there is one MTFTP background operation in progress.
    @retval EFI_NO_MAPPING        When using a default address, configuration (DHCP, BOOTP,
                                  RARP, etc.) has not finished yet.
    @retval EFI_UNSUPPORTED       A configuration protocol (DHCP, BOOTP, RARP, etc.) could not
                                  be located when clients choose to use the default address
                                  settings.
    @retval EFI_OUT_OF_RESOURCES  The EFI MTFTPv4 Protocol driver instance data could not be
                                  allocated.
    @retval EFI_DEVICE_ERROR      An unexpected system or network error occurred. The EFI
                                   MTFTPv4 Protocol driver instance is not configured.
  
  **/
  typedef
  EFI_STATUS
  (EFIAPI *EFI_MTFTP4_CONFIGURE)(
    IN EFI_MTFTP4_PROTOCOL       *This,
    IN EFI_MTFTP4_CONFIG_DATA    *MtftpConfigData OPTIONAL
    );
  
  
  /**
    Gets information about a file from an MTFTPv4 server.
  
    @param  This         The pointer to the EFI_MTFTP4_PROTOCOL instance.
    @param  OverrideData Data that is used to override the existing parameters. If NULL,
                         the default parameters that were set in the
                         EFI_MTFTP4_PROTOCOL.Configure() function are used.
    @param  Filename     The pointer to null-terminated ASCII file name string.
    @param  ModeStr      The pointer to null-terminated ASCII mode string. If NULL, "octet" will be used.
    @param  OptionCount  Number of option/value string pairs in OptionList.
    @param  OptionList   The pointer to array of option/value string pairs. Ignored if
                         OptionCount is zero.
    @param  PacketLength The number of bytes in the returned packet.
    @param  Packet       The pointer to the received packet. This buffer must be freed by
                         the caller.
  
    @retval EFI_SUCCESS              An MTFTPv4 OACK packet was received and is in the Packet.
    @retval EFI_INVALID_PARAMETER    One or more of the following conditions is TRUE:
                                     - This is NULL.
                                     - Filename is NULL.
                                     - OptionCount is not zero and OptionList is NULL.
                                     - One or more options in OptionList have wrong format.
                                     - PacketLength is NULL.
                                     - One or more IPv4 addresses in OverrideData are not valid
                                       unicast IPv4 addresses if OverrideData is not NULL.
    @retval EFI_UNSUPPORTED          One or more options in the OptionList are in the
                                     unsupported list of structure EFI_MTFTP4_MODE_DATA.
    @retval EFI_NOT_STARTED          The EFI MTFTPv4 Protocol driver has not been started.
    @retval EFI_NO_MAPPING           When using a default address, configuration (DHCP, BOOTP,
                                     RARP, etc.) has not finished yet.
    @retval EFI_ACCESS_DENIED        The previous operation has not completed yet.
    @retval EFI_OUT_OF_RESOURCES     Required system resources could not be allocated.
    @retval EFI_TFTP_ERROR           An MTFTPv4 ERROR packet was received and is in the Packet.
    @retval EFI_NETWORK_UNREACHABLE  An ICMP network unreachable error packet was received and the Packet is set to NULL.
    @retval EFI_HOST_UNREACHABLE     An ICMP host unreachable error packet was received and the Packet is set to NULL.
    @retval EFI_PROTOCOL_UNREACHABLE An ICMP protocol unreachable error packet was received and the Packet is set to NULL.
    @retval EFI_PORT_UNREACHABLE     An ICMP port unreachable error packet was received and the Packet is set to NULL.
    @retval EFI_ICMP_ERROR           Some other ICMP ERROR packet was received and is in the Buffer.
    @retval EFI_PROTOCOL_ERROR       An unexpected MTFTPv4 packet was received and is in the Packet.
    @retval EFI_TIMEOUT              No responses were received from the MTFTPv4 server.
    @retval EFI_DEVICE_ERROR         An unexpected network error or system error occurred.
    @retval EFI_NO_MEDIA             There was a media error.
  
  **/
  typedef
  EFI_STATUS
  (EFIAPI *EFI_MTFTP4_GET_INFO)(
    IN  EFI_MTFTP4_PROTOCOL      *This,
    IN  EFI_MTFTP4_OVERRIDE_DATA *OverrideData   OPTIONAL,
    IN  UINT8                    *Filename,
    IN  UINT8                    *ModeStr        OPTIONAL,
    IN  UINT8                    OptionCount,
    IN  EFI_MTFTP4_OPTION        *OptionList,
    OUT UINT32                   *PacketLength,
    OUT EFI_MTFTP4_PACKET        **Packet        OPTIONAL
    );
  
  /**
    Parses the options in an MTFTPv4 OACK packet.
  
    @param  This         The pointer to the EFI_MTFTP4_PROTOCOL instance.
    @param  PacketLen    Length of the OACK packet to be parsed.
    @param  Packet       The pointer to the OACK packet to be parsed.
    @param  OptionCount  The pointer to the number of options in following OptionList.
    @param  OptionList   The pointer to EFI_MTFTP4_OPTION storage. Call the EFI Boot
                         Service FreePool() to release the OptionList if the options
                         in this OptionList are not needed any more.
  
    @retval EFI_SUCCESS           The OACK packet was valid and the OptionCount and
                                  OptionList parameters have been updated.
    @retval EFI_INVALID_PARAMETER One or more of the following conditions is TRUE:
                                  - PacketLen is 0.
                                  - Packet is NULL or Packet is not a valid MTFTPv4 packet.
                                  - OptionCount is NULL.
    @retval EFI_NOT_FOUND         No options were found in the OACK packet.
    @retval EFI_OUT_OF_RESOURCES  Storage for the OptionList array cannot be allocated.
    @retval EFI_PROTOCOL_ERROR    One or more of the option fields is invalid.
  
  **/
  typedef
  EFI_STATUS
  (EFIAPI *EFI_MTFTP4_PARSE_OPTIONS)(
    IN  EFI_MTFTP4_PROTOCOL      *This,
    IN  UINT32                   PacketLen,
    IN  EFI_MTFTP4_PACKET        *Packet,
    OUT UINT32                   *OptionCount,
    OUT EFI_MTFTP4_OPTION        **OptionList OPTIONAL
    );
  
  
  /**
    Downloads a file from an MTFTPv4 server.
  
    @param  This  The pointer to the EFI_MTFTP4_PROTOCOL instance.
    @param  Token The pointer to the token structure to provide the parameters that are
                  used in this operation.
  
    @retval EFI_SUCCESS              The data file has been transferred successfully.
    @retval EFI_OUT_OF_RESOURCES     Required system resources could not be allocated.
    @retval EFI_BUFFER_TOO_SMALL     BufferSize is not zero but not large enough to hold the
                                     downloaded data in downloading process.
    @retval EFI_ABORTED              Current operation is aborted by user.
    @retval EFI_NETWORK_UNREACHABLE  An ICMP network unreachable error packet was received.
    @retval EFI_HOST_UNREACHABLE     An ICMP host unreachable error packet was received.
    @retval EFI_PROTOCOL_UNREACHABLE An ICMP protocol unreachable error packet was received.
    @retval EFI_PORT_UNREACHABLE     An ICMP port unreachable error packet was received.
    @retval EFI_ICMP_ERROR           Some other  ICMP ERROR packet was received.
    @retval EFI_TIMEOUT              No responses were received from the MTFTPv4 server.
    @retval EFI_TFTP_ERROR           An MTFTPv4 ERROR packet was received.
    @retval EFI_DEVICE_ERROR         An unexpected network error or system error occurred.
    @retval EFI_NO_MEDIA             There was a media error.
  
  **/
  typedef
  EFI_STATUS
  (EFIAPI *EFI_MTFTP4_READ_FILE)(
    IN EFI_MTFTP4_PROTOCOL       *This,
    IN EFI_MTFTP4_TOKEN          *Token
    );
  
  
  
  /**
    Sends a file to an MTFTPv4 server.
  
    @param  This  The pointer to the EFI_MTFTP4_PROTOCOL instance.
    @param  Token The pointer to the token structure to provide the parameters that are
                  used in this operation.
  
    @retval EFI_SUCCESS           The upload session has started.
    @retval EFI_UNSUPPORTED       The operation is not supported by this implementation.
    @retval EFI_INVALID_PARAMETER One or more parameters are invalid.
    @retval EFI_UNSUPPORTED       One or more options in the Token.OptionList are in
                                  the unsupported list of structure EFI_MTFTP4_MODE_DATA.
    @retval EFI_NOT_STARTED       The EFI MTFTPv4 Protocol driver has not been started.
    @retval EFI_NO_MAPPING        When using a default address, configuration (DHCP, BOOTP,
                                  RARP, etc.) is not finished yet.
    @retval EFI_ALREADY_STARTED   This Token is already being used in another MTFTPv4 session.
    @retval EFI_OUT_OF_RESOURCES  Required system resources could not be allocated.
    @retval EFI_ACCESS_DENIED     The previous operation has not completed yet.
    @retval EFI_DEVICE_ERROR      An unexpected network error or system error occurred.
  
  **/
  typedef
  EFI_STATUS
  (EFIAPI *EFI_MTFTP4_WRITE_FILE)(
    IN EFI_MTFTP4_PROTOCOL       *This,
    IN EFI_MTFTP4_TOKEN          *Token
    );
  
  
  /**
    Downloads a data file "directory" from an MTFTPv4 server. May be unsupported in some EFI
    implementations.
  
    @param  This  The pointer to the EFI_MTFTP4_PROTOCOL instance.
    @param  Token The pointer to the token structure to provide the parameters that are
                  used in this operation.
  
    @retval EFI_SUCCESS           The MTFTPv4 related file "directory" has been downloaded.
    @retval EFI_UNSUPPORTED       The operation is not supported by this implementation.
    @retval EFI_INVALID_PARAMETER One or more parameters are invalid.
    @retval EFI_UNSUPPORTED       One or more options in the Token.OptionList are in
                                  the unsupported list of structure EFI_MTFTP4_MODE_DATA.
    @retval EFI_NOT_STARTED       The EFI MTFTPv4 Protocol driver has not been started.
    @retval EFI_NO_MAPPING        When using a default address, configuration (DHCP, BOOTP,
                                  RARP, etc.) is not finished yet.
    @retval EFI_ALREADY_STARTED   This Token is already being used in another MTFTPv4 session.
    @retval EFI_OUT_OF_RESOURCES  Required system resources could not be allocated.
    @retval EFI_ACCESS_DENIED     The previous operation has not completed yet.
    @retval EFI_DEVICE_ERROR      An unexpected network error or system error occurred.
  
  **/
  typedef
  EFI_STATUS
  (EFIAPI *EFI_MTFTP4_READ_DIRECTORY)(
    IN EFI_MTFTP4_PROTOCOL       *This,
    IN EFI_MTFTP4_TOKEN          *Token
    );
  
  /**
    Polls for incoming data packets and processes outgoing data packets.
  
    @param  This The pointer to the EFI_MTFTP4_PROTOCOL instance.
  
    @retval  EFI_SUCCESS           Incoming or outgoing data was processed.
    @retval  EFI_NOT_STARTED       This EFI MTFTPv4 Protocol instance has not been started.
    @retval  EFI_NO_MAPPING        When using a default address, configuration (DHCP, BOOTP,
                                   RARP, etc.) is not finished yet.
    @retval  EFI_INVALID_PARAMETER This is NULL.
    @retval  EFI_DEVICE_ERROR      An unexpected system or network error occurred.
    @retval  EFI_TIMEOUT           Data was dropped out of the transmit and/or receive queue.
                                   Consider increasing the polling rate.
  
  **/
  typedef
  EFI_STATUS
  (EFIAPI *EFI_MTFTP4_POLL)(
    IN EFI_MTFTP4_PROTOCOL       *This
    );
  
  ///
  /// The EFI_MTFTP4_PROTOCOL is designed to be used by UEFI drivers and applications
  /// to transmit and receive data files. The EFI MTFTPv4 Protocol driver uses
  /// the underlying EFI UDPv4 Protocol driver and EFI IPv4 Protocol driver.
  ///
  struct _EFI_MTFTP4_PROTOCOL {
    EFI_MTFTP4_GET_MODE_DATA     GetModeData;
    EFI_MTFTP4_CONFIGURE         Configure;
    EFI_MTFTP4_GET_INFO          GetInfo;
    EFI_MTFTP4_PARSE_OPTIONS     ParseOptions;
    EFI_MTFTP4_READ_FILE         ReadFile;
    EFI_MTFTP4_WRITE_FILE        WriteFile;
    EFI_MTFTP4_READ_DIRECTORY    ReadDirectory;
    EFI_MTFTP4_POLL              Poll;
  };
  
  struct _EFI_MTFTP4_TOKEN {
    ///
    /// The status that is returned to the caller at the end of the operation
    /// to indicate whether this operation completed successfully.
    ///
    EFI_STATUS                  Status;
    ///
    /// The event that will be signaled when the operation completes. If
    /// set to NULL, the corresponding function will wait until the read or
    /// write operation finishes. The type of Event must be
    /// EVT_NOTIFY_SIGNAL. The Task Priority Level (TPL) of
    /// Event must be lower than or equal to TPL_CALLBACK.
    ///
    EFI_EVENT                   Event;
    ///
    /// If not NULL, the data that will be used to override the existing configure data.
    ///
    EFI_MTFTP4_OVERRIDE_DATA    *OverrideData;
    ///
    /// The pointer to the null-terminated ASCII file name string.
    ///
    UINT8                       *Filename;
    ///
    /// The pointer to the null-terminated ASCII mode string. If NULL, "octet" is used.
    ///
    UINT8                       *ModeStr;
    ///
    /// Number of option/value string pairs.
    ///
    UINT32                      OptionCount;
    ///
    /// The pointer to an array of option/value string pairs. Ignored if OptionCount is zero.
    ///
    EFI_MTFTP4_OPTION           *OptionList;
    ///
    /// The size of the data buffer.
    ///
    UINT64                      BufferSize;
    ///
    /// The pointer to the data buffer. Data that is downloaded from the
    /// MTFTPv4 server is stored here. Data that is uploaded to the
    /// MTFTPv4 server is read from here. Ignored if BufferSize is zero.
    ///
    VOID                        *Buffer;
    ///
    /// The pointer to the context that will be used by CheckPacket,
    /// TimeoutCallback and PacketNeeded.
    ///
    VOID                        *Context;
    ///
    /// The pointer to the callback function to check the contents of the received packet.
    ///
    EFI_MTFTP4_CHECK_PACKET     CheckPacket;
    ///
    /// The pointer to the function to be called when a timeout occurs.
    ///
    EFI_MTFTP4_TIMEOUT_CALLBACK TimeoutCallback;
    ///
    /// The pointer to the function to provide the needed packet contents.
    ///
    EFI_MTFTP4_PACKET_NEEDED    PacketNeeded;
  };
  
  extern EFI_GUID gEfiMtftp4ServiceBindingProtocolGuid;
  extern EFI_GUID gEfiMtftp4ProtocolGuid;
  
  #endif
  
  