audk/OvmfPkg/Include/Library/SerializeVariablesLib.h

/** @file
  Serialize & Deserialize UEFI Variables

  Copyright (c) 2011, 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
  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.

**/

#ifndef __SERIALIZE_VARIABLES_LIB__
#define __SERIALIZE_VARIABLES_LIB__


/**
  Callback function for each variable

  @param[in] Context - Context as sent to the iteration function
  @param[in] VariableName - Refer to RuntimeServices GetNextVariableName
  @param[in] VendorGuid - Refer to RuntimeServices GetNextVariableName
  @param[in] Attributes - Refer to RuntimeServices GetVariable
  @param[in] DataSize - Refer to RuntimeServices GetVariable
  @param[in] Data - Refer to RuntimeServices GetVariable

  @retval RETURN_SUCCESS         Continue iterating through the variables
  @return Any RETURN_ERROR       Stop iterating through the variables

**/
typedef
RETURN_STATUS
(EFIAPI *VARIABLE_SERIALIZATION_ITERATION_CALLBACK)(
  IN  VOID                         *Context,
  IN  CHAR16                       *VariableName,
  IN  EFI_GUID                     *VendorGuid,
  IN  UINT32                       Attributes,
  IN  UINTN                        DataSize,
  IN  VOID                         *Data
  );


/**
  Creates a new variable serialization instance

  @param[out]  Handle - Handle for a variable serialization instance

  @retval      RETURN_SUCCESS - The variable serialization instance was
                 successfully created.
  @retval      RETURN_OUT_OF_RESOURCES - There we not enough resources to
                 create the variable serialization instance.

**/
RETURN_STATUS
EFIAPI
SerializeVariablesNewInstance (
  OUT EFI_HANDLE                      *Handle
  );


/**
  Free memory associated with a variable serialization instance

  @param[in]  Handle - Handle for a variable serialization instance

  @retval      RETURN_SUCCESS - The variable serialization instance was
                 successfully freed.
  @retval      RETURN_INVALID_PARAMETER - Handle was not a valid
                 variable serialization instance.

**/
RETURN_STATUS
EFIAPI
SerializeVariablesFreeInstance (
  IN EFI_HANDLE Handle
  );


/**
  Creates a new variable serialization instance using the given
  binary representation of the variables to fill the new instance

  @param[out] Handle - Handle for a variable serialization instance
  @param[in]  Buffer - A buffer with the serialized representation
                of the variables.  Must be the same format as produced
                by SerializeVariablesToBuffer.
  @param[in]  Size - This is the size of the binary representation
                of the variables.

  @retval      RETURN_SUCCESS - The binary representation was successfully
                 imported into a new variable serialization instance
  @retval      RETURN_OUT_OF_RESOURCES - There we not enough resources to
                 create the new variable serialization instance

**/
RETURN_STATUS
EFIAPI
SerializeVariablesNewInstanceFromBuffer (
  OUT EFI_HANDLE                          *Handle,
  IN  VOID                                *Buffer,
  IN  UINTN                               Size
  );


/**
  Iterates all variables found with RuntimeServices GetNextVariableName

  @param[in]   CallbackFunction - Function called for each variable instance
  @param[in]   Context - Passed to each call of CallbackFunction

  @retval      RETURN_SUCCESS - All variables were iterated without the
                 CallbackFunction returning an error
  @retval      RETURN_OUT_OF_RESOURCES - There we not enough resources to
                 iterate through the variables
  @return      Any of RETURN_ERROR indicates an error reading the variable
                 or an error was returned from CallbackFunction

**/
RETURN_STATUS
EFIAPI
SerializeVariablesIterateSystemVariables (
  IN VARIABLE_SERIALIZATION_ITERATION_CALLBACK CallbackFunction,
  IN VOID                                      *Context
  );


/**
  Iterates all variables found in the variable serialization instance

  @param[in]   Handle - Handle for a variable serialization instance
  @param[in]   CallbackFunction - Function called for each variable instance
  @param[in]   Context - Passed to each call of CallbackFunction

  @retval      RETURN_SUCCESS - All variables were iterated without the
                 CallbackFunction returning an error
  @retval      RETURN_OUT_OF_RESOURCES - There we not enough resources to
                 iterate through the variables
  @return      Any of RETURN_ERROR indicates an error reading the variable
                 or an error was returned from CallbackFunction

**/
RETURN_STATUS
EFIAPI
SerializeVariablesIterateInstanceVariables (
  IN EFI_HANDLE                                Handle,
  IN VARIABLE_SERIALIZATION_ITERATION_CALLBACK CallbackFunction,
  IN VOID                                      *Context
  );


/**
  Sets all variables found in the variable serialization instance

  @param[in]   Handle - Handle for a variable serialization instance

  @retval      RETURN_SUCCESS - All variables were set successfully
  @retval      RETURN_OUT_OF_RESOURCES - There we not enough resources to
                 set all the variables
  @return      Any of RETURN_ERROR indicates an error reading the variables
                 or in attempting to set a variable

**/
RETURN_STATUS
EFIAPI
SerializeVariablesSetSerializedVariables (
  IN EFI_HANDLE                       Handle
  );


/**
  Adds a variable to the variable serialization instance

  @param[in] Handle - Handle for a variable serialization instance
  @param[in] VariableName - Refer to RuntimeServices GetVariable
  @param[in] VendorGuid - Refer to RuntimeServices GetVariable
  @param[in] Attributes - Refer to RuntimeServices GetVariable
  @param[in] DataSize - Refer to RuntimeServices GetVariable
  @param[in] Data - Refer to RuntimeServices GetVariable

  @retval      RETURN_SUCCESS - All variables were set successfully
  @retval      RETURN_OUT_OF_RESOURCES - There we not enough resources to
                 add the variable

**/
RETURN_STATUS
EFIAPI
SerializeVariablesAddVariable (
  IN EFI_HANDLE                   Handle,
  IN CHAR16                       *VariableName,
  IN EFI_GUID                     *VendorGuid,
  IN UINT32                       Attributes,
  IN UINTN                        DataSize,
  IN VOID                         *Data
  );


/**
  Serializes the variables known to this instance into the
  provided buffer.

  @param[in]     Handle - Handle for a variable serialization instance
  @param[out]    Buffer - A buffer to store the binary representation
                   of the variables.
  @param[in,out] Size - On input this is the size of the buffer.
                   On output this is the size of the binary representation
                   of the variables.

  @retval      RETURN_SUCCESS - The binary representation was successfully
                 completed and returned in the buffer.
  @retval      RETURN_OUT_OF_RESOURCES - There we not enough resources to
                 save the variables to the buffer.
  @retval      RETURN_INVALID_PARAMETER - Handle was not a valid
                 variable serialization instance or
                 Size or Buffer were NULL.

**/
RETURN_STATUS
EFIAPI
SerializeVariablesToBuffer (
  IN     EFI_HANDLE                       Handle,
  OUT    VOID                             *Buffer,
  IN OUT UINTN                            *Size
  );


#endif