audk/IntelFrameworkPkg/Library/HiiLibFramework/HiiLibFramework.c

/** @file
  HII Library implementation that uses DXE protocols and services.

  Copyright (c) 2006, Intel Corporation<BR>
  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.

**/


#include <FrameworkDxe.h>

#include <Protocol/FrameworkHii.h>

#include <Library/DebugLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/MemoryAllocationLib.h>

EFI_HII_PROTOCOL      *gHiiProtocol = NULL;

/**
  The constructor function for HiiLibFramework library instance

  The constructor function locates Hii protocol from protocol database.
  It will ASSERT() if that operation fails and it will always return EFI_SUCCESS.

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

  @retval EFI_SUCCESS   The constructor always returns EFI_SUCCESS.

**/
EFI_STATUS
EFIAPI
HiiLibFrameworkConstructor (
  IN      EFI_HANDLE                ImageHandle,
  IN      EFI_SYSTEM_TABLE          *SystemTable
  )
{
  EFI_STATUS                        Status;

  Status = gBS->LocateProtocol (
                  &gEfiHiiProtocolGuid,
                  NULL,
                  (VOID **) &gHiiProtocol
                  );
  ASSERT_EFI_ERROR (Status);

  return Status;  
}

/**
  This function allocates pool for an EFI_HII_PACKAGES structure
  with enough space for the variable argument list of package pointers.
  The allocated structure is initialized using NumberOfPackages, Guid,
  and the variable length argument list of package pointers.

  @param  NumberOfPackages The number of HII packages to prepare.
  @param  Guid             Package GUID.
  @param  Args             Package contents

  @return                  The allocated and initialized packages.

**/
EFI_HII_PACKAGES *
InternalPreparePackages (
  IN UINTN                          NumberOfPackages,
  IN CONST EFI_GUID                 *Guid OPTIONAL,
  IN VA_LIST                        Args
  )
{
  EFI_HII_PACKAGES                  *HiiPackages;
  VOID                              **Package;
  UINTN                             Index;

  ASSERT (NumberOfPackages > 0);

  HiiPackages = AllocateZeroPool (sizeof (EFI_HII_PACKAGES) + NumberOfPackages * sizeof (VOID *));
  ASSERT (HiiPackages != NULL);

  HiiPackages->GuidId           = (EFI_GUID *) Guid;
  HiiPackages->NumberOfPackages = NumberOfPackages;
  Package                       = (VOID **) (((UINT8 *) HiiPackages) + sizeof (EFI_HII_PACKAGES));

  for (Index = 0; Index < NumberOfPackages; Index++) {
    *Package = VA_ARG (Args, VOID *);
    Package++;
  }

  return HiiPackages;
}