audk/MdePkg/Include/Ppi/GuidedSectionExtraction.h

/** @file
  If a GUID-defined section is encountered when doing section extraction, 
  the PEI Foundation or the EFI_PEI_FILE_LOADER_PPI instance 
  calls the appropriate instance of the GUIDed Section Extraction PPI 
  to extract the section stream contained therein. 

  Copyright (c) 2006 - 2008, 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.             

  @par Revision Reference:
  This PPI is defined in PI Version 1.00.

**/

#ifndef __EFI_GUIDED_SECTION_EXTRACTION_PPI_H__
#define __EFI_GUIDED_SECTION_EXTRACTION_PPI_H__

//
// Typically, protocol interface structures are identified 
// by associating them with a GUID. Each instance of 
// a protocol with a given GUID must have 
// the same interface structure. While all instances of 
// the GUIDed Section Extraction PPI must have 
// the same interface structure, they do not all have 
// te same GUID. The GUID that is associated with 
// an instance of the GUIDed Section Extraction Protocol 
// is used to correlate it with the GUIDed section type 
// that it is intended to process.
//


typedef struct _EFI_PEI_GUIDED_SECTION_EXTRACTION_PPI   EFI_PEI_GUIDED_SECTION_EXTRACTION_PPI;


/**
  Processes the input section and returns the data contained therein 
  along with the authentication status.

  The ExtractSection() function processes the input section and
  returns a pointer to the section contents. If the section being
  extracted does not require processing (if the section
  GuidedSectionHeader.Attributes has the
  EFI_GUIDED_SECTION_PROCESSING_REQUIRED field cleared), then
  OutputBuffer is just updated to point to the start of the
  section's contents. Otherwise, *Buffer must be allocated
  from PEI permanent memory.

  @param This                   Indicates the
                                EFI_PEI_GUIDED_SECTION_EXTRACTION_PPI instance.
                                Buffer containing the input GUIDed section to be
                                processed. OutputBuffer OutputBuffer is
                                allocated from PEI permanent memory and contains
                                the new section stream.
  
  @param OutputSize             A pointer to a caller-allocated
                                UINTN in which the size of *OutputBuffer
                                allocation is stored. If the function
                                returns anything other than EFI_SUCCESS,
                                the value of OutputSize is undefined.
  
  @param AuthenticationStatus   A pointer to a caller-allocated
                                UINT32 that indicates the
                                authentication status of the
                                output buffer. If the input
                                section's GuidedSectionHeader.
                                Attributes field has the
                                EFI_GUIDED_SECTION_AUTH_STATUS_VALID 
                                bit as clear,
                                AuthenticationStatus must return
                                zero. These bits reflect the
                                status of the extraction
                                operation. If the function
                                returns anything other than
                                EFI_SUCCESS, the value of
                                AuthenticationStatus is
                                undefined.
  
  @retval EFI_SUCCESS           The InputSection was
                                successfully processed and the
                                section contents were returned.
  
  @retval EFI_OUT_OF_RESOURCES  The system has insufficient
                                resources to process the request.
  
  @retval EFI_INVALID_PARAMETER The GUID in InputSection does
                                not match this instance of the
                                GUIDed Section Extraction PPI.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PEI_EXTRACT_GUIDED_SECTION)(
  IN CONST  EFI_PEI_GUIDED_SECTION_EXTRACTION_PPI *This,
  IN CONST  VOID                                  *InputSection,
  OUT       VOID                                  **OutputBuffer,
  OUT       UINTN                                 *OutputSize,
  OUT       UINT32                                *AuthenticationStatus
);



/**
  @par Ppi Description:
  If a GUID-defined section is encountered when doing section extraction,
  the PEI Foundation or the EFI_PEI_FILE_LOADER_PPI instance
  calls the appropriate instance of the GUIDed Section
  Extraction PPI to extract the section stream contained
  therein.
  
  
  @param ExtractSection   Takes the GUIDed section as input and
                          produces the section stream data. See
                          the ExtractSection() function
                          description.
  
**/
struct _EFI_PEI_GUIDED_SECTION_EXTRACTION_PPI {
  EFI_PEI_EXTRACT_GUIDED_SECTION ExtractSection;
};



#endif