MdePkg/Include/Library/ExtractGuidedSectionLib.h

   1 /** @file
   2   This library provides common functions to process the different guided section data.
   3
   4   This library provides functions to process GUIDed sections of FFS files.  Handlers may
   5   be registered to decode GUIDed sections of FFS files.  Services are provided to determine
   6   the set of supported section GUIDs, collection information about a specific GUIDed section,
   7   and decode a specific GUIDed section.
   8
   9   A library instance that produces this library class may be used to produce a
  10   EFI_PEI_GUIDED_SECTION_EXTRACTION_PPI or a EFI_GUIDED_SECTION_EXTRACTION_PROTOCOL
  11   providing a simple method to extend the number of GUIDed sections types a platform supports.
  12
  13 Copyright (c) 2006 - 2008, Intel Corporation<BR>
  14 All rights reserved. This program and the accompanying materials
  15 are licensed and made available under the terms and conditions of the BSD License
  16 which accompanies this distribution.  The full text of the license may be found at
  17 http://opensource.org/licenses/bsd-license.php
  18
  19 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  20 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  21
  22 **/
  23 #ifndef __EXTRACT_GUIDED_SECTION_H__
  24 #define __EXTRACT_GUIDED_SECTION_H__
  25
  26 /**
  27   Examines a GUIDed section and returns the size of the decoded buffer and the
  28   size of an optional scratch buffer required to actually decode the data in a GUIDed section.
  29
  30   Examines a GUIDed section specified by InputSection.
  31   If GUID for InputSection does not match the GUID that this handler supports,
  32   then RETURN_UNSUPPORTED is returned.
  33   If the required information can not be retrieved from InputSection,
  34   then RETURN_INVALID_PARAMETER is returned.
  35   If the GUID of InputSection does match the GUID that this handler supports,
  36   then the size required to hold the decoded buffer is returned in OututBufferSize,
  37   the size of an optional scratch buffer is returned in ScratchSize, and the Attributes field
  38   from EFI_GUID_DEFINED_SECTION header of InputSection is returned in SectionAttribute.
  39
  40   If InputSection is NULL, then ASSERT().
  41   If OutputBufferSize is NULL, then ASSERT().
  42   If ScratchBufferSize is NULL, then ASSERT().
  43   If SectionAttribute is NULL, then ASSERT().
  44
  45
  46   @param[in]  InputSection       A pointer to a GUIDed section of an FFS formatted file.
  47   @param[out] OutputBufferSize   A pointer to the size, in bytes, of an output buffer required
  48                                  if the buffer specified by InputSection were decoded.
  49   @param[out] ScratchBufferSize  A pointer to the size, in bytes, required as scratch space
  50                                  if the buffer specified by InputSection were decoded.
  51   @param[out] SectionAttribute   A pointer to the attributes of the GUIDed section. See the Attributes
  52                                  field of EFI_GUID_DEFINED_SECTION in the PI Specification.
  53
  54   @retval  RETURN_SUCCESS            The information about InputSection was returned.
  55   @retval  RETURN_UNSUPPORTED        The section specified by InputSection does not match the GUID this handler supports.
  56   @retval  RETURN_INVALID_PARAMETER  The information can not be retrieved from the section specified by InputSection.
  57
  58 **/
  59 typedef
  60 RETURN_STATUS
  61 (EFIAPI *EXTRACT_GUIDED_SECTION_GET_INFO_HANDLER)(
  62   IN CONST  VOID    *InputSection,
  63   OUT       UINT32  *OutputBufferSize,
  64   OUT       UINT32  *ScratchBufferSize,
  65   OUT       UINT16  *SectionAttribute
  66   );
  67
  68 /**
  69   Decodes a GUIDed section into a caller allocated output buffer.
  70
  71   Decodes the GUIDed section specified by InputSection.
  72   If GUID for InputSection does not match the GUID that this handler supports, then RETURN_UNSUPPORTED is returned.
  73   If the data in InputSection can not be decoded, then RETURN_INVALID_PARAMETER is returned.
  74   If the GUID of InputSection does match the GUID that this handler supports, then InputSection
  75   is decoded into the buffer specified by OutputBuffer and the authentication status of this
  76   decode operation is returned in AuthenticationStatus.  If the decoded buffer is identical to the
  77   data in InputSection, then OutputBuffer is set to point at the data in InputSection.  Otherwise,
  78   the decoded data will be placed in caller allocated buffer specified by OutputBuffer.
  79
  80   If InputSection is NULL, then ASSERT().
  81   If OutputBuffer is NULL, then ASSERT().
  82   If ScratchBuffer is NULL and this decode operation requires a scratch buffer, then ASSERT().
  83   If AuthenticationStatus is NULL, then ASSERT().
  84
  85
  86   @param[in]  InputSection  A pointer to a GUIDed section of an FFS formatted file.
  87   @param[out] OutputBuffer  A pointer to a buffer that contains the result of a decode operation.
  88   @param[out] ScratchBuffer A caller allocated buffer that may be required by this function
  89                             as a scratch buffer to perform the decode operation.
  90   @param[out] AuthenticationStatus
  91                             A pointer to the authentication status of the decoded output buffer.
  92                             See the definition of authentication status in the EFI_PEI_GUIDED_SECTION_EXTRACTION_PPI
  93                             section of the PI Specification. EFI_AUTH_STATUS_PLATFORM_OVERRIDE must
  94                             never be set by this handler.
  95
  96   @retval  RETURN_SUCCESS            The buffer specified by InputSection was decoded.
  97   @retval  RETURN_UNSPPORTED         The section specified by InputSection does not match the GUID this handler supports.
  98   @retval  RETURN_INVALID_PARAMETER  The section specified by InputSection can not be decoded.
  99
 100 **/
 101 typedef
 102 RETURN_STATUS
 103 (EFIAPI *EXTRACT_GUIDED_SECTION_DECODE_HANDLER)(
 104   IN CONST  VOID    *InputSection,
 105   OUT       VOID    **OutputBuffer,
 106   IN        VOID    *ScratchBuffer,        OPTIONAL
 107   OUT       UINT32  *AuthenticationStatus
 108   );
 109
 110 /**
 111   Registers handlers of type EXTRACT_GUIDED_SECTION_GET_INFO_HANDLER and EXTRACT_GUIDED_SECTION_DECODE_HANDLER
 112   for a specific GUID section type.
 113
 114   Registers the handlers specified by GetInfoHandler and DecodeHandler with the GUID specified by SectionGuid.
 115   If the GUID value specified by SectionGuid has already been registered, then return RETURN_ALREADY_STARTED.
 116   If there are not enough resources available to register the handlers  then RETURN_OUT_OF_RESOURCES is returned.
 117
 118   If SectionGuid is NULL, then ASSERT().
 119   If GetInfoHandler is NULL, then ASSERT().
 120   If DecodeHandler is NULL, then ASSERT().
 121
 122   @param[in]  SectionGuid    A pointer to the GUID associated with the the handlers
 123                              of the GUIDed section type being registered.
 124   @param[in]  GetInfoHandler Pointer to a function that examines a GUIDed section and returns the
 125                              size of the decoded buffer and the size of an optional scratch buffer
 126                              required to actually decode the data in a GUIDed section.
 127   @param[in]  DecodeHandler  Pointer to a function that decodes a GUIDed section into a caller
 128                              allocated output buffer.
 129
 130   @retval  RETURN_SUCCESS           The handlers were registered.
 131   @retval  RETURN_ALREADY_STARTED   Handlers have already been registered for the GUID specified by SectionGuid.
 132   @retval  RETURN_OUT_OF_RESOURCES  There are not enough resources available to register the handlers.
 133
 134 **/
 135 RETURN_STATUS
 136 EFIAPI
 137 ExtractGuidedSectionRegisterHandlers (
 138   IN CONST  GUID                                     *SectionGuid,
 139   IN        EXTRACT_GUIDED_SECTION_GET_INFO_HANDLER  GetInfoHandler,
 140   IN        EXTRACT_GUIDED_SECTION_DECODE_HANDLER    DecodeHandler
 141   );
 142
 143 /**
 144   Retrieve the list GUIDs that have been registered through ExtractGuidedSectionRegisterHandlers().
 145
 146   Sets ExtractHandlerGuidTable so it points at a callee allocated array of registered GUIDs.
 147   The total number of GUIDs in the array are returned. Since the array of GUIDs is callee allocated
 148   and caller must treat this array of GUIDs as read-only data.
 149   If ExtractHandlerGuidTable is NULL, then ASSERT().
 150
 151   @param[out]  ExtractHandlerGuidTable  A pointer to the array of GUIDs that have been registered through
 152                                         ExtractGuidedSectionRegisterHandlers().
 153
 154   @return the number of the supported extract guided Handler.
 155
 156 **/
 157 UINTN
 158 EFIAPI
 159 ExtractGuidedSectionGetGuidList (
 160   OUT  GUID  **ExtractHandlerGuidTable
 161   );
 162
 163 /**
 164   Retrieves a GUID from a GUIDed section and uses that GUID to select an associated handler of type
 165   EXTRACT_GUIDED_SECTION_GET_INFO_HANDLER that was registered with ExtractGuidedSectionRegisterHandlers().
 166   The selected handler is used to retrieve and return the size of the decoded buffer and the size of an
 167   optional scratch buffer required to actually decode the data in a GUIDed section.
 168
 169   Examines a GUIDed section specified by InputSection.
 170   If GUID for InputSection does not match any of the GUIDs registered through ExtractGuidedSectionRegisterHandlers(),
 171   then RETURN_UNSUPPORTED is returned.
 172   If the GUID of InputSection does match the GUID that this handler supports, then the the associated handler
 173   of type EXTRACT_GUIDED_SECTION_GET_INFO_HANDLER that was registered with ExtractGuidedSectionRegisterHandlers()
 174   is used to retrieve the OututBufferSize, ScratchSize, and Attributes values. The return status from the handler of
 175   type EXTRACT_GUIDED_SECTION_GET_INFO_HANDLER is returned.
 176
 177   If InputSection is NULL, then ASSERT().
 178   If OutputBufferSize is NULL, then ASSERT().
 179   If ScratchBufferSize is NULL, then ASSERT().
 180   If SectionAttribute is NULL, then ASSERT().
 181
 182   @param[in]  InputSection       A pointer to a GUIDed section of an FFS formatted file.
 183   @param[out] OutputBufferSize   A pointer to the size, in bytes, of an output buffer required if the buffer
 184                                  specified by InputSection were decoded.
 185   @param[out] ScratchBufferSize  A pointer to the size, in bytes, required as scratch space if the buffer specified by
 186                                  InputSection were decoded.
 187   @param[out] SectionAttribute   A pointer to the attributes of the GUIDed section.  See the Attributes field of
 188                                  EFI_GUID_DEFINED_SECTION in the PI Specification.
 189
 190   @retval  RETURN_SUCCESS      Get the required information successfully.
 191   @retval  RETURN_UNSUPPORTED  The GUID from the section specified by InputSection does not match any of
 192                                the GUIDs registered with ExtractGuidedSectionRegisterHandlers().
 193   @retval  Others              The return status from the handler associated with the GUID retrieved from
 194                                the section specified by InputSection.
 195
 196 **/
 197 RETURN_STATUS
 198 EFIAPI
 199 ExtractGuidedSectionGetInfo (
 200   IN  CONST VOID    *InputSection,
 201   OUT       UINT32  *OutputBufferSize,
 202   OUT       UINT32  *ScratchBufferSize,
 203   OUT       UINT16  *SectionAttribute
 204   );
 205
 206 /**
 207   Retrieves the GUID from a GUIDed section and uses that GUID to select an associated handler of type
 208   EXTRACT_GUIDED_SECTION_DECODE_HANDLER that was registered with ExtractGuidedSectionRegisterHandlers().
 209   The selected handler is used to decode the data in a GUIDed section and return the result in a caller
 210   allocated output buffer.
 211
 212   Decodes the GUIDed section specified by InputSection.
 213   If GUID for InputSection does not match any of the GUIDs registered through ExtractGuidedSectionRegisterHandlers(),
 214   then RETURN_UNSUPPORTED is returned.
 215   If the GUID of InputSection does match the GUID that this handler supports, then the the associated handler
 216   of type EXTRACT_GUIDED_SECTION_DECODE_HANDLER that was registered with ExtractGuidedSectionRegisterHandlers()
 217   is used to decode InputSection into the buffer specified by OutputBuffer and the authentication status of this
 218   decode operation is returned in AuthenticationStatus.  If the decoded buffer is identical to the data in InputSection,
 219   then OutputBuffer is set to point at the data in InputSection.  Otherwise, the decoded data will be placed in caller
 220   allocated buffer specified by OutputBuffer.    This function is responsible for computing the  EFI_AUTH_STATUS_PLATFORM_OVERRIDE
 221   bit of in AuthenticationStatus.  The return status from the handler of type EXTRACT_GUIDED_SECTION_DECODE_HANDLER is returned.
 222
 223   If InputSection is NULL, then ASSERT().
 224   If OutputBuffer is NULL, then ASSERT().
 225   If ScratchBuffer is NULL and this decode operation requires a scratch buffer, then ASSERT().
 226   If AuthenticationStatus is NULL, then ASSERT().
 227
 228   @param[in]  InputSection   A pointer to a GUIDed section of an FFS formatted file.
 229   @param[out] OutputBuffer   A pointer to a buffer that contains the result of a decode operation.
 230   @param[in]  ScratchBuffer  A caller allocated buffer that may be required by this function as a scratch buffer to perform the decode operation.
 231   @param[out] AuthenticationStatus
 232                              A pointer to the authentication status of the decoded output buffer. See the definition
 233                              of authentication status in the EFI_PEI_GUIDED_SECTION_EXTRACTION_PPI section of the PI
 234                              Specification.
 235
 236   @retval  RETURN_SUCCESS           The buffer specified by InputSection was decoded.
 237   @retval  RETURN_UNSUPPORTED       The section specified by InputSection does not match the GUID this handler supports.
 238   @retval  RETURN_INVALID_PARAMETER The section specified by InputSection can not be decoded.
 239
 240 **/
 241 RETURN_STATUS
 242 EFIAPI
 243 ExtractGuidedSectionDecode (
 244   IN  CONST VOID    *InputSection,
 245   OUT       VOID    **OutputBuffer,
 246   IN        VOID    *ScratchBuffer,        OPTIONAL
 247   OUT       UINT32  *AuthenticationStatus
 248   );
 249
 250 #endif