#include <PiDxe.h>
#include <Library/DebugLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/ExtractGuidedSectionLib.h>
#include <Library/UefiBootServicesTableLib.h>

Macros
#define	EXTRACT_HANDLER_TABLE_SIZE 0x10

Functions
RETURN_STATUS EFIAPI	ReallocateExtractHandlerTable (VOID)

RETURN_STATUS EFIAPI	DxeExtractGuidedSectionLibConstructor (IN EFI_HANDLE ImageHandle, IN EFI_SYSTEM_TABLE *SystemTable)

UINTN EFIAPI	ExtractGuidedSectionGetGuidList (OUT GUID **ExtractHandlerGuidTable)

RETURN_STATUS EFIAPI	ExtractGuidedSectionRegisterHandlers (IN CONST GUID *SectionGuid, IN EXTRACT_GUIDED_SECTION_GET_INFO_HANDLER GetInfoHandler, IN EXTRACT_GUIDED_SECTION_DECODE_HANDLER DecodeHandler)

RETURN_STATUS EFIAPI	ExtractGuidedSectionGetInfo (IN CONST VOID InputSection, OUT UINT32 OutputBufferSize, OUT UINT32 ScratchBufferSize, OUT UINT16 SectionAttribute)

RETURN_STATUS EFIAPI	ExtractGuidedSectionDecode (IN CONST VOID InputSection, OUT VOID OutputBuffer, IN VOID ScratchBuffer OPTIONAL, OUT UINT32 *AuthenticationStatus)

RETURN_STATUS EFIAPI	ExtractGuidedSectionGetHandlers (IN CONST GUID SectionGuid, OUT EXTRACT_GUIDED_SECTION_GET_INFO_HANDLER GetInfoHandler OPTIONAL, OUT EXTRACT_GUIDED_SECTION_DECODE_HANDLER *DecodeHandler OPTIONAL)

Variables
UINT32	mNumberOfExtractHandler = 0

UINT32	mMaxNumberOfExtractHandler = 0

GUID *	mExtractHandlerGuidTable = NULL

EXTRACT_GUIDED_SECTION_DECODE_HANDLER *	mExtractDecodeHandlerTable = NULL

EXTRACT_GUIDED_SECTION_GET_INFO_HANDLER *	mExtractGetInfoHandlerTable = NULL

Detailed Description

Provide generic extract guided section functions for Dxe phase.

Copyright (c) 2007 - 2018, Intel Corporation. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent

Definition in file DxeExtractGuidedSectionLib.c.

Macro Definition Documentation

◆ EXTRACT_HANDLER_TABLE_SIZE

#define EXTRACT_HANDLER_TABLE_SIZE 0x10

Definition at line 17 of file DxeExtractGuidedSectionLib.c.

Function Documentation

◆ DxeExtractGuidedSectionLibConstructor()

RETURN_STATUS EFIAPI DxeExtractGuidedSectionLibConstructor	(	IN EFI_HANDLE	ImageHandle,
		IN EFI_SYSTEM_TABLE *	SystemTable
	)

Constructor allocates the global memory to store the registered guid and Handler list.

Parameters

ImageHandle	The firmware allocated handle for the EFI image.
SystemTable	A pointer to the EFI System Table.

Return values

RETURN_SUCCESS	Allocated the global memory space to store guid and function tables.
RETURN_OUT_OF_RESOURCES	Not enough memory to allocate.

Definition at line 110 of file DxeExtractGuidedSectionLib.c.

◆ ExtractGuidedSectionDecode()

RETURN_STATUS EFIAPI ExtractGuidedSectionDecode	(	IN CONST VOID *	InputSection,
		OUT VOID **	OutputBuffer,
		IN VOID *ScratchBuffer	OPTIONAL,
		OUT UINT32 *	AuthenticationStatus
	)

Retrieves the GUID from a GUIDed section and uses that GUID to select an associated handler of type EXTRACT_GUIDED_SECTION_DECODE_HANDLER that was registered with ExtractGuidedSectionRegisterHandlers(). The selected handler is used to decode the data in a GUIDed section and return the result in a caller allocated output buffer.

Decodes the GUIDed section specified by InputSection. If GUID for InputSection does not match any of the GUIDs registered through ExtractGuidedSectionRegisterHandlers(), then RETURN_UNSUPPORTED is returned. If the GUID of InputSection does match the GUID that this handler supports, then the associated handler of type EXTRACT_GUIDED_SECTION_DECODE_HANDLER that was registered with ExtractGuidedSectionRegisterHandlers() is used to decode InputSection into the buffer specified by OutputBuffer and the authentication status of this decode operation is returned in AuthenticationStatus. If the decoded buffer is identical to the data in InputSection, then OutputBuffer is set to point at the data in InputSection. Otherwise, the decoded data will be placed in caller allocated buffer specified by OutputBuffer. This function is responsible for computing the EFI_AUTH_STATUS_PLATFORM_OVERRIDE bit of in AuthenticationStatus. The return status from the handler of type EXTRACT_GUIDED_SECTION_DECODE_HANDLER is returned.

If InputSection is NULL, then ASSERT(). If OutputBuffer is NULL, then ASSERT(). If ScratchBuffer is NULL and this decode operation requires a scratch buffer, then ASSERT(). If AuthenticationStatus is NULL, then ASSERT().

Parameters

[in]	InputSection	A pointer to a GUIDed section of an FFS formatted file.
[out]	OutputBuffer	A pointer to a buffer that contains the result of a decode operation.
[in]	ScratchBuffer	A caller allocated buffer that may be required by this function as a scratch buffer to perform the decode operation.
[out]	AuthenticationStatus	A pointer to the authentication status of the decoded output buffer. See the definition of authentication status in the EFI_PEI_GUIDED_SECTION_EXTRACTION_PPI section of the PI Specification.

Return values

RETURN_SUCCESS	The buffer specified by InputSection was decoded.
RETURN_UNSUPPORTED	The section specified by InputSection does not match the GUID this handler supports.
RETURN_INVALID_PARAMETER	The section specified by InputSection can not be decoded.

Definition at line 345 of file DxeExtractGuidedSectionLib.c.

◆ ExtractGuidedSectionGetGuidList()

UINTN EFIAPI ExtractGuidedSectionGetGuidList ( OUT GUID ** ExtractHandlerGuidTable )

Retrieve the list GUIDs that have been registered through ExtractGuidedSectionRegisterHandlers().

Sets ExtractHandlerGuidTable so it points at a callee allocated array of registered GUIDs. The total number of GUIDs in the array are returned. Since the array of GUIDs is callee allocated and caller must treat this array of GUIDs as read-only data. If ExtractHandlerGuidTable is NULL, then ASSERT().

Parameters

[out] ExtractHandlerGuidTable A pointer to the array of GUIDs that have been registered through ExtractGuidedSectionRegisterHandlers().

Returns: The number of the supported extract guided Handler.

Definition at line 134 of file DxeExtractGuidedSectionLib.c.

◆ ExtractGuidedSectionGetHandlers()

RETURN_STATUS EFIAPI ExtractGuidedSectionGetHandlers	(	IN CONST GUID *	SectionGuid,
		OUT EXTRACT_GUIDED_SECTION_GET_INFO_HANDLER *GetInfoHandler	OPTIONAL,
		OUT EXTRACT_GUIDED_SECTION_DECODE_HANDLER *DecodeHandler	OPTIONAL
	)

Retrieves handlers of type EXTRACT_GUIDED_SECTION_GET_INFO_HANDLER and EXTRACT_GUIDED_SECTION_DECODE_HANDLER for a specific GUID section type.

Retrieves the handlers associated with SectionGuid and returns them in GetInfoHandler and DecodeHandler.

If the GUID value specified by SectionGuid has not been registered, then return RETURN_NOT_FOUND.

If SectionGuid is NULL, then ASSERT().

Parameters

[in]	SectionGuid	A pointer to the GUID associated with the handlers of the GUIDed section type being retrieved.
[out]	GetInfoHandler	Pointer to a function that examines a GUIDed section and returns the size of the decoded buffer and the size of an optional scratch buffer required to actually decode the data in a GUIDed section. This is an optional parameter that may be NULL. If it is NULL, then the previously registered handler is not returned.
[out]	DecodeHandler	Pointer to a function that decodes a GUIDed section into a caller allocated output buffer. This is an optional parameter that may be NULL. If it is NULL, then the previously registered handler is not returned.

Return values

RETURN_SUCCESS	The handlers were retrieved.
RETURN_NOT_FOUND	No handlers have been registered with the specified GUID.

Definition at line 420 of file DxeExtractGuidedSectionLib.c.

◆ ExtractGuidedSectionGetInfo()

RETURN_STATUS EFIAPI ExtractGuidedSectionGetInfo	(	IN CONST VOID *	InputSection,
		OUT UINT32 *	OutputBufferSize,
		OUT UINT32 *	ScratchBufferSize,
		OUT UINT16 *	SectionAttribute
	)

Retrieves a GUID from a GUIDed section and uses that GUID to select an associated handler of type EXTRACT_GUIDED_SECTION_GET_INFO_HANDLER that was registered with ExtractGuidedSectionRegisterHandlers(). The selected handler is used to retrieve and return the size of the decoded buffer and the size of an optional scratch buffer required to actually decode the data in a GUIDed section.

Examines a GUIDed section specified by InputSection. If GUID for InputSection does not match any of the GUIDs registered through ExtractGuidedSectionRegisterHandlers(), then RETURN_UNSUPPORTED is returned. If the GUID of InputSection does match the GUID that this handler supports, then the associated handler of type EXTRACT_GUIDED_SECTION_GET_INFO_HANDLER that was registered with ExtractGuidedSectionRegisterHandlers() is used to retrieve the OutputBufferSize, ScratchSize, and Attributes values. The return status from the handler of type EXTRACT_GUIDED_SECTION_GET_INFO_HANDLER is returned.

If InputSection is NULL, then ASSERT(). If OutputBufferSize is NULL, then ASSERT(). If ScratchBufferSize is NULL, then ASSERT(). If SectionAttribute is NULL, then ASSERT().

Parameters

[in]	InputSection	A pointer to a GUIDed section of an FFS formatted file.
[out]	OutputBufferSize	A pointer to the size, in bytes, of an output buffer required if the buffer specified by InputSection were decoded.
[out]	ScratchBufferSize	A pointer to the size, in bytes, required as scratch space if the buffer specified by InputSection were decoded.
[out]	SectionAttribute	A pointer to the attributes of the GUIDed section. See the Attributes field of EFI_GUID_DEFINED_SECTION in the PI Specification.

Return values

RETURN_SUCCESS	Successfully obtained the required information.
RETURN_UNSUPPORTED	The GUID from the section specified by InputSection does not match any of the GUIDs registered with ExtractGuidedSectionRegisterHandlers().
Others	The return status from the handler associated with the GUID retrieved from the section specified by InputSection.

Definition at line 264 of file DxeExtractGuidedSectionLib.c.

◆ ExtractGuidedSectionRegisterHandlers()

RETURN_STATUS EFIAPI ExtractGuidedSectionRegisterHandlers	(	IN CONST GUID *	SectionGuid,
		IN EXTRACT_GUIDED_SECTION_GET_INFO_HANDLER	GetInfoHandler,
		IN EXTRACT_GUIDED_SECTION_DECODE_HANDLER	DecodeHandler
	)

Registers handlers of type EXTRACT_GUIDED_SECTION_GET_INFO_HANDLER and EXTRACT_GUIDED_SECTION_DECODE_HANDLER for a specific GUID section type.

Registers the handlers specified by GetInfoHandler and DecodeHandler with the GUID specified by SectionGuid. If the GUID value specified by SectionGuid has already been registered, then return RETURN_ALREADY_STARTED. If there are not enough resources available to register the handlers then RETURN_OUT_OF_RESOURCES is returned.

If SectionGuid is NULL, then ASSERT(). If GetInfoHandler is NULL, then ASSERT(). If DecodeHandler is NULL, then ASSERT().

Parameters

[in]	SectionGuid	A pointer to the GUID associated with the handlers of the GUIDed section type being registered.
[in]	GetInfoHandler	The pointer to a function that examines a GUIDed section and returns the size of the decoded buffer and the size of an optional scratch buffer required to actually decode the data in a GUIDed section.
[in]	DecodeHandler	The pointer to a function that decodes a GUIDed section into a caller allocated output buffer.

Return values