/** @file

  This library class defines a set of interfaces to customize Display module

Copyright (c) 2013-2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent

**/
#include "CustomizedDisplayLibInternal.h"

EFI_SCREEN_DESCRIPTOR  gScreenDimensions;
CHAR16                 *mLibUnknownString;
extern EFI_HII_HANDLE  mCDLStringPackHandle;
CHAR16                 *mSpaceBuffer;
#define SPACE_BUFFER_SIZE  1000

//
// Browser Global Strings
//
CHAR16  *gEnterString;
CHAR16  *gEnterCommitString;
CHAR16  *gEnterEscapeString;
CHAR16  *gEscapeString;
CHAR16  *gMoveHighlight;
CHAR16  *gDecNumericInput;
CHAR16  *gHexNumericInput;
CHAR16  *gToggleCheckBox;
CHAR16  *gLibEmptyString;
CHAR16  *gAreYouSure;
CHAR16  *gYesResponse;
CHAR16  *gNoResponse;
CHAR16  *gPlusString;
CHAR16  *gMinusString;
CHAR16  *gAdjustNumber;
CHAR16  *gSaveChanges;
CHAR16  *gNvUpdateMessage;
CHAR16  *gInputErrorMessage;

/**

  Print banner info for front page.

  @param[in]  FormData             Form Data to be shown in Page

**/
VOID
PrintBannerInfo (
  IN FORM_DISPLAY_ENGINE_FORM  *FormData
  )
{
  UINT8   Line;
  UINT8   Alignment;
  CHAR16  *StrFrontPageBanner;
  UINT8   RowIdx;
  UINT8   ColumnIdx;

  //
  //    ClearLines(0, LocalScreen.RightColumn, 0, BANNER_HEIGHT-1, BANNER_TEXT | BANNER_BACKGROUND);
  //
  ClearLines (
    gScreenDimensions.LeftColumn,
    gScreenDimensions.RightColumn,
    gScreenDimensions.TopRow,
    FRONT_PAGE_HEADER_HEIGHT - 1 + gScreenDimensions.TopRow,
    BANNER_TEXT | BANNER_BACKGROUND
    );

  //
  //    for (Line = 0; Line < BANNER_HEIGHT; Line++) {
  //
  for (Line = (UINT8)gScreenDimensions.TopRow; Line < BANNER_HEIGHT + (UINT8)gScreenDimensions.TopRow; Line++) {
    //
    //      for (Alignment = 0; Alignment < BANNER_COLUMNS; Alignment++) {
    //
    for (Alignment = (UINT8)gScreenDimensions.LeftColumn;
         Alignment < BANNER_COLUMNS + (UINT8)gScreenDimensions.LeftColumn;
         Alignment++
         )
    {
      RowIdx    = (UINT8)(Line - (UINT8)gScreenDimensions.TopRow);
      ColumnIdx = (UINT8)(Alignment - (UINT8)gScreenDimensions.LeftColumn);

      ASSERT (RowIdx < BANNER_HEIGHT && ColumnIdx < BANNER_COLUMNS);

      if ((gBannerData != NULL) && (gBannerData->Banner[RowIdx][ColumnIdx] != 0x0000)) {
        StrFrontPageBanner = LibGetToken (gBannerData->Banner[RowIdx][ColumnIdx], FormData->HiiHandle);
      } else {
        continue;
      }

      switch (Alignment - gScreenDimensions.LeftColumn) {
        case 0:
          //
          // Handle left column
          //
          PrintStringAt (gScreenDimensions.LeftColumn + BANNER_LEFT_COLUMN_INDENT, Line, StrFrontPageBanner);
          break;

        case 1:
          //
          // Handle center column
          //
          PrintStringAt (
            gScreenDimensions.LeftColumn + (gScreenDimensions.RightColumn - gScreenDimensions.LeftColumn) / 3,
            Line,
            StrFrontPageBanner
            );
          break;

        case 2:
          //
          // Handle right column
          //
          PrintStringAt (
            gScreenDimensions.LeftColumn + (gScreenDimensions.RightColumn - gScreenDimensions.LeftColumn) * 2 / 3,
            Line,
            StrFrontPageBanner
            );
          break;
      }

      FreePool (StrFrontPageBanner);
    }
  }
}

/**
  Print framework and form title for a page.

  @param[in]  FormData             Form Data to be shown in Page
**/
VOID
PrintFramework (
  IN FORM_DISPLAY_ENGINE_FORM  *FormData
  )
{
  UINTN   Index;
  CHAR16  Character;
  CHAR16  *Buffer;
  UINTN   Row;
  CHAR16  *TitleStr;
  UINTN   TitleColumn;

  if (gClassOfVfr != FORMSET_CLASS_PLATFORM_SETUP) {
    //
    // Only Setup page needs Framework
    //
    ClearLines (
      gScreenDimensions.LeftColumn,
      gScreenDimensions.RightColumn,
      gScreenDimensions.BottomRow - STATUS_BAR_HEIGHT - gFooterHeight,
      gScreenDimensions.BottomRow - STATUS_BAR_HEIGHT - 1,
      KEYHELP_TEXT | KEYHELP_BACKGROUND
      );
    return;
  }

  Buffer = AllocateZeroPool (0x10000);
  ASSERT (Buffer != NULL);
  Character = BOXDRAW_HORIZONTAL;
  for (Index = 0; Index + 2 < (gScreenDimensions.RightColumn - gScreenDimensions.LeftColumn); Index++) {
    Buffer[Index] = Character;
  }

  //
  // Print Top border line
  // +------------------------------------------------------------------------------+
  // ?                                                                             ?
  // +------------------------------------------------------------------------------+
  //
  gST->ConOut->SetAttribute (gST->ConOut, TITLE_TEXT | TITLE_BACKGROUND);
  Character = BOXDRAW_DOWN_RIGHT;

  PrintCharAt (gScreenDimensions.LeftColumn, gScreenDimensions.TopRow, Character);
  PrintStringAt ((UINTN)-1, (UINTN)-1, Buffer);

  Character = BOXDRAW_DOWN_LEFT;
  PrintCharAt ((UINTN)-1, (UINTN)-1, Character);

  Character = BOXDRAW_VERTICAL;
  for (Row = gScreenDimensions.TopRow + 1; Row <= gScreenDimensions.TopRow + NONE_FRONT_PAGE_HEADER_HEIGHT - 2; Row++) {
    PrintCharAt (gScreenDimensions.LeftColumn, Row, Character);
    PrintCharAt (gScreenDimensions.RightColumn - 1, Row, Character);
  }

  //
  // Print Form Title
  //
  TitleStr = LibGetToken (FormData->FormTitle, FormData->HiiHandle);
  ASSERT (TitleStr != NULL);
  TitleColumn = (gScreenDimensions.RightColumn + gScreenDimensions.LeftColumn - LibGetStringWidth (TitleStr) / 2) / 2;
  PrintStringAtWithWidth (gScreenDimensions.LeftColumn + 1, gScreenDimensions.TopRow + 1, gLibEmptyString, TitleColumn - gScreenDimensions.LeftColumn - 1);
  PrintStringAtWithWidth (
    TitleColumn,
    gScreenDimensions.TopRow + 1,
    TitleStr,
    gScreenDimensions.RightColumn - 1 - TitleColumn
    );
  FreePool (TitleStr);

  Character = BOXDRAW_UP_RIGHT;
  PrintCharAt (gScreenDimensions.LeftColumn, gScreenDimensions.TopRow + NONE_FRONT_PAGE_HEADER_HEIGHT - 1, Character);
  PrintStringAt ((UINTN)-1, (UINTN)-1, Buffer);

  Character = BOXDRAW_UP_LEFT;
  PrintCharAt ((UINTN)-1, (UINTN)-1, Character);

  //
  // Print Bottom border line
  // +------------------------------------------------------------------------------+
  // ?                                                                             ?
  // +------------------------------------------------------------------------------+
  //
  Character = BOXDRAW_DOWN_RIGHT;
  PrintCharAt (gScreenDimensions.LeftColumn, gScreenDimensions.BottomRow - STATUS_BAR_HEIGHT - gFooterHeight, Character);

  PrintStringAt ((UINTN)-1, (UINTN)-1, Buffer);

  Character = BOXDRAW_DOWN_LEFT;
  PrintCharAt ((UINTN)-1, (UINTN)-1, Character);
  Character = BOXDRAW_VERTICAL;
  for (Row = gScreenDimensions.BottomRow - STATUS_BAR_HEIGHT - gFooterHeight + 1;
       Row <= gScreenDimensions.BottomRow - STATUS_BAR_HEIGHT - 2;
       Row++
       )
  {
    PrintCharAt (gScreenDimensions.LeftColumn, Row, Character);
    PrintCharAt (gScreenDimensions.RightColumn - 1, Row, Character);
  }

  Character = BOXDRAW_UP_RIGHT;
  PrintCharAt (gScreenDimensions.LeftColumn, gScreenDimensions.BottomRow - STATUS_BAR_HEIGHT - 1, Character);

  PrintStringAt ((UINTN)-1, (UINTN)-1, Buffer);

  Character = BOXDRAW_UP_LEFT;
  PrintCharAt ((UINTN)-1, (UINTN)-1, Character);

  FreePool (Buffer);
}

/**
  Process some op code which is not recognized by browser core.

  @param OpCodeData                  The pointer to the op code buffer.

  @return EFI_SUCCESS            Pass the statement success.

**/
VOID
ProcessUserOpcode (
  IN  EFI_IFR_OP_HEADER  *OpCodeData
  )
{
  EFI_GUID  *ClassGuid;
  UINT8     ClassGuidNum;

  ClassGuid    = NULL;
  ClassGuidNum = 0;

  switch (OpCodeData->OpCode) {
    case EFI_IFR_FORM_SET_OP:
      //
      // process the statement outside of form,if it is formset op, get its formsetguid or classguid and compared with gFrontPageFormSetGuid
      //
      if (CompareMem (PcdGetPtr (PcdFrontPageFormSetGuid), &((EFI_IFR_FORM_SET *)OpCodeData)->Guid, sizeof (EFI_GUID)) == 0) {
        gClassOfVfr = FORMSET_CLASS_FRONT_PAGE;
      } else {
        ClassGuidNum = (UINT8)(((EFI_IFR_FORM_SET *)OpCodeData)->Flags & 0x3);
        ClassGuid    = (EFI_GUID *)(VOID *)((UINT8 *)OpCodeData + sizeof (EFI_IFR_FORM_SET));
        while (ClassGuidNum-- > 0) {
          if (CompareGuid ((EFI_GUID *)PcdGetPtr (PcdFrontPageFormSetGuid), ClassGuid)) {
            gClassOfVfr = FORMSET_CLASS_FRONT_PAGE;
            break;
          }

          ClassGuid++;
        }
      }

      break;

    case EFI_IFR_GUID_OP:
      if (CompareGuid (&gEfiIfrTianoGuid, (EFI_GUID *)((CHAR8 *)OpCodeData + sizeof (EFI_IFR_OP_HEADER)))) {
        //
        // Tiano specific GUIDed opcodes
        //
        switch (((EFI_IFR_GUID_LABEL *)OpCodeData)->ExtendOpCode) {
          case EFI_IFR_EXTEND_OP_LABEL:
            //
            // just ignore label
            //
            break;

          case EFI_IFR_EXTEND_OP_BANNER:
            //
            // Only in front page form set, we care about the banner data.
            //
            if (gClassOfVfr == FORMSET_CLASS_FRONT_PAGE) {
              //
              // Initialize Driver private data
              //
              if (gBannerData == NULL) {
                gBannerData = AllocateZeroPool (sizeof (BANNER_DATA));
                ASSERT (gBannerData != NULL);
              }

              CopyMem (
                &gBannerData->Banner[((EFI_IFR_GUID_BANNER *)OpCodeData)->LineNumber][
                                                                                      ((EFI_IFR_GUID_BANNER *)OpCodeData)->Alignment],
                &((EFI_IFR_GUID_BANNER *)OpCodeData)->Title,
                sizeof (EFI_STRING_ID)
                );
            }

            break;

          case EFI_IFR_EXTEND_OP_SUBCLASS:
            if (((EFI_IFR_GUID_SUBCLASS *)OpCodeData)->SubClass == EFI_FRONT_PAGE_SUBCLASS) {
              gClassOfVfr = FORMSET_CLASS_FRONT_PAGE;
            }

            break;

          default:
            break;
        }
      }

      break;

    default:
      break;
  }
}

/**
  Process some op codes which is out side of current form.

  @param FormData                Pointer to the form data.

  @return EFI_SUCCESS            Pass the statement success.

**/
VOID
ProcessExternedOpcode (
  IN FORM_DISPLAY_ENGINE_FORM  *FormData
  )
{
  LIST_ENTRY                     *Link;
  LIST_ENTRY                     *NestLink;
  FORM_DISPLAY_ENGINE_STATEMENT  *Statement;
  FORM_DISPLAY_ENGINE_STATEMENT  *NestStatement;

  Link = GetFirstNode (&FormData->StatementListOSF);
  while (!IsNull (&FormData->StatementListOSF, Link)) {
    Statement = FORM_DISPLAY_ENGINE_STATEMENT_FROM_LINK (Link);
    Link      = GetNextNode (&FormData->StatementListOSF, Link);

    ProcessUserOpcode (Statement->OpCode);
  }

  Link = GetFirstNode (&FormData->StatementListHead);
  while (!IsNull (&FormData->StatementListHead, Link)) {
    Statement = FORM_DISPLAY_ENGINE_STATEMENT_FROM_LINK (Link);
    Link      = GetNextNode (&FormData->StatementListHead, Link);

    ProcessUserOpcode (Statement->OpCode);

    NestLink = GetFirstNode (&Statement->NestStatementList);
    while (!IsNull (&Statement->NestStatementList, NestLink)) {
      NestStatement = FORM_DISPLAY_ENGINE_STATEMENT_FROM_LINK (NestLink);
      NestLink      = GetNextNode (&Statement->NestStatementList, NestLink);

      ProcessUserOpcode (NestStatement->OpCode);
    }
  }
}

/**
  Validate the input screen dimension info.

  @param  FormData               The input form data info.

  @return EFI_SUCCESS            The input screen info is acceptable.
  @return EFI_INVALID_PARAMETER  The input screen info is not acceptable.

**/
EFI_STATUS
ScreenDimensionInfoValidate (
  IN FORM_DISPLAY_ENGINE_FORM  *FormData
  )
{
  LIST_ENTRY  *Link;
  UINTN       Index;

  //
  // Calculate total number of Register HotKeys.
  //
  Index = 0;
  if (!IsListEmpty (&FormData->HotKeyListHead)) {
    Link = GetFirstNode (&FormData->HotKeyListHead);
    while (!IsNull (&FormData->HotKeyListHead, Link)) {
      Link = GetNextNode (&FormData->HotKeyListHead, Link);
      Index++;
    }
  }

  //
  // Show three HotKeys help information on one row.
  //
  gFooterHeight = FOOTER_HEIGHT + (Index / 3);

  ZeroMem (&gScreenDimensions, sizeof (EFI_SCREEN_DESCRIPTOR));
  gST->ConOut->QueryMode (
                 gST->ConOut,
                 gST->ConOut->Mode->Mode,
                 &gScreenDimensions.RightColumn,
                 &gScreenDimensions.BottomRow
                 );

  //
  // Check local dimension vs. global dimension.
  //
  if (FormData->ScreenDimensions != NULL) {
    if ((gScreenDimensions.RightColumn < FormData->ScreenDimensions->RightColumn) ||
        (gScreenDimensions.BottomRow < FormData->ScreenDimensions->BottomRow)
        )
    {
      return EFI_INVALID_PARAMETER;
    } else {
      //
      // Local dimension validation.
      //
      if ((FormData->ScreenDimensions->RightColumn > FormData->ScreenDimensions->LeftColumn) &&
          (FormData->ScreenDimensions->BottomRow > FormData->ScreenDimensions->TopRow) &&
          ((FormData->ScreenDimensions->RightColumn - FormData->ScreenDimensions->LeftColumn) > 2) &&
          ((FormData->ScreenDimensions->BottomRow - FormData->ScreenDimensions->TopRow) > STATUS_BAR_HEIGHT +
           FRONT_PAGE_HEADER_HEIGHT + gFooterHeight + 3))
      {
        CopyMem (&gScreenDimensions, (VOID *)FormData->ScreenDimensions, sizeof (EFI_SCREEN_DESCRIPTOR));
      } else {
        return EFI_INVALID_PARAMETER;
      }
    }
  }

  return EFI_SUCCESS;
}

/**
  Get the string based on the StringId and HII Package List Handle.

  @param  Token                  The String's ID.
  @param  HiiHandle              The package list in the HII database to search for
                                 the specified string.

  @return The output string.

**/
CHAR16 *
LibGetToken (
  IN  EFI_STRING_ID   Token,
  IN  EFI_HII_HANDLE  HiiHandle
  )
{
  EFI_STRING  String;

  String = HiiGetString (HiiHandle, Token, NULL);
  if (String == NULL) {
    String = AllocateCopyPool (StrSize (mLibUnknownString), mLibUnknownString);
    ASSERT (String != NULL);
  }

  return (CHAR16 *)String;
}

/**
  Count the storage space of a Unicode string.

  This function handles the Unicode string with NARROW_CHAR
  and WIDE_CHAR control characters. NARROW_HCAR and WIDE_CHAR
  does not count in the resultant output. If a WIDE_CHAR is
  hit, then 2 Unicode character will consume an output storage
  space with size of CHAR16 till a NARROW_CHAR is hit.

  If String is NULL, then ASSERT ().

  @param String          The input string to be counted.

  @return Storage space for the input string.

**/
UINTN
LibGetStringWidth (
  IN CHAR16  *String
  )
{
  UINTN  Index;
  UINTN  Count;
  UINTN  IncrementValue;

  ASSERT (String != NULL);
  if (String == NULL) {
    return 0;
  }

  Index          = 0;
  Count          = 0;
  IncrementValue = 1;

  do {
    //
    // Advance to the null-terminator or to the first width directive
    //
    for ( ;
          (String[Index] != NARROW_CHAR) && (String[Index] != WIDE_CHAR) && (String[Index] != 0);
          Index++, Count = Count + IncrementValue
          )
    {
    }

    //
    // We hit the null-terminator, we now have a count
    //
    if (String[Index] == 0) {
      break;
    }

    //
    // We encountered a narrow directive - strip it from the size calculation since it doesn't get printed
    // and also set the flag that determines what we increment by.(if narrow, increment by 1, if wide increment by 2)
    //
    if (String[Index] == NARROW_CHAR) {
      //
      // Skip to the next character
      //
      Index++;
      IncrementValue = 1;
    } else {
      //
      // Skip to the next character
      //
      Index++;
      IncrementValue = 2;
    }
  } while (String[Index] != 0);

  //
  // Increment by one to include the null-terminator in the size
  //
  Count++;

  return Count * sizeof (CHAR16);
}

/**
  Show all registered HotKey help strings on bottom Rows.

  @param FormData          The curent input form data info.
  @param SetState          Set HotKey or Clear HotKey

**/
VOID
PrintHotKeyHelpString (
  IN FORM_DISPLAY_ENGINE_FORM  *FormData,
  IN BOOLEAN                   SetState
  )
{
  UINTN                  CurrentCol;
  UINTN                  CurrentRow;
  UINTN                  BottomRowOfHotKeyHelp;
  UINTN                  ColumnIndexWidth;
  UINTN                  ColumnWidth;
  UINTN                  ColumnIndex;
  UINTN                  Index;
  EFI_SCREEN_DESCRIPTOR  LocalScreen;
  LIST_ENTRY             *Link;
  BROWSER_HOT_KEY        *HotKey;
  CHAR16                 BakChar;
  CHAR16                 *ColumnStr;

  CopyMem (&LocalScreen, &gScreenDimensions, sizeof (EFI_SCREEN_DESCRIPTOR));
  ColumnWidth           = (LocalScreen.RightColumn - LocalScreen.LeftColumn) / 3;
  BottomRowOfHotKeyHelp = LocalScreen.BottomRow - STATUS_BAR_HEIGHT - 3;
  ColumnStr             = gLibEmptyString;

  //
  // Calculate total number of Register HotKeys.
  //
  Index = 0;
  Link  = GetFirstNode (&FormData->HotKeyListHead);
  while (!IsNull (&FormData->HotKeyListHead, Link)) {
    HotKey = BROWSER_HOT_KEY_FROM_LINK (Link);
    //
    // Calculate help information Column and Row.
    //
    ColumnIndex = Index % 3;
    if (ColumnIndex == 0) {
      CurrentCol       = LocalScreen.LeftColumn + 2 * ColumnWidth;
      ColumnIndexWidth = LocalScreen.RightColumn - CurrentCol - 1;
    } else if (ColumnIndex == 1) {
      CurrentCol       = LocalScreen.LeftColumn + ColumnWidth;
      ColumnIndexWidth = ColumnWidth;
    } else {
      CurrentCol       = LocalScreen.LeftColumn + 2;
      ColumnIndexWidth = ColumnWidth - 2;
    }

    CurrentRow = BottomRowOfHotKeyHelp - Index / 3;

    //
    // Help string can't exceed ColumnWidth. One Row will show three Help information.
    //
    BakChar = L'\0';
    if (StrLen (HotKey->HelpString) > ColumnIndexWidth) {
      BakChar                              = HotKey->HelpString[ColumnIndexWidth];
      HotKey->HelpString[ColumnIndexWidth] = L'\0';
    }

    //
    // Print HotKey help string on bottom Row.
    //
    if (SetState) {
      ColumnStr = HotKey->HelpString;
    }

    PrintStringAtWithWidth (CurrentCol, CurrentRow, ColumnStr, ColumnIndexWidth);

    if (BakChar != L'\0') {
      HotKey->HelpString[ColumnIndexWidth] = BakChar;
    }

    //
    // Get Next Hot Key.
    //
    Link = GetNextNode (&FormData->HotKeyListHead, Link);
    Index++;
  }

  if (SetState) {
    //
    // Clear KeyHelp
    //
    CurrentRow  = BottomRowOfHotKeyHelp - Index / 3;
    ColumnIndex = Index % 3;
    if (ColumnIndex == 0) {
      CurrentCol       = LocalScreen.LeftColumn + 2 * ColumnWidth;
      ColumnIndexWidth = LocalScreen.RightColumn - CurrentCol - 1;
      ColumnIndex++;
      PrintStringAtWithWidth (CurrentCol, CurrentRow, gLibEmptyString, ColumnIndexWidth);
    }

    if (ColumnIndex == 1) {
      CurrentCol       = LocalScreen.LeftColumn + ColumnWidth;
      ColumnIndexWidth = ColumnWidth;
      PrintStringAtWithWidth (CurrentCol, CurrentRow, gLibEmptyString, ColumnIndexWidth);
    }
  }

  return;
}

/**
  Get step info from numeric opcode.

  @param[in] OpCode     The input numeric op code.

  @return step info for this opcode.
**/
UINT64
LibGetFieldFromNum (
  IN  EFI_IFR_OP_HEADER  *OpCode
  )
{
  EFI_IFR_NUMERIC  *NumericOp;
  UINT64           Step;

  NumericOp = (EFI_IFR_NUMERIC *)OpCode;

  switch (NumericOp->Flags & EFI_IFR_NUMERIC_SIZE) {
    case EFI_IFR_NUMERIC_SIZE_1:
      Step = NumericOp->data.u8.Step;
      break;

    case EFI_IFR_NUMERIC_SIZE_2:
      Step = NumericOp->data.u16.Step;
      break;

    case EFI_IFR_NUMERIC_SIZE_4:
      Step = NumericOp->data.u32.Step;
      break;

    case EFI_IFR_NUMERIC_SIZE_8:
      Step = NumericOp->data.u64.Step;
      break;

    default:
      Step = 0;
      break;
  }

  return Step;
}

/**
  Initialize the HII String Token to the correct values.

**/
VOID
InitializeLibStrings (
  VOID
  )
{
  mLibUnknownString = L"!";

  gEnterString       = LibGetToken (STRING_TOKEN (ENTER_STRING), mCDLStringPackHandle);
  gEnterCommitString = LibGetToken (STRING_TOKEN (ENTER_COMMIT_STRING), mCDLStringPackHandle);
  gEnterEscapeString = LibGetToken (STRING_TOKEN (ENTER_ESCAPE_STRING), mCDLStringPackHandle);
  gEscapeString      = LibGetToken (STRING_TOKEN (ESCAPE_STRING), mCDLStringPackHandle);
  gMoveHighlight     = LibGetToken (STRING_TOKEN (MOVE_HIGHLIGHT), mCDLStringPackHandle);
  gDecNumericInput   = LibGetToken (STRING_TOKEN (DEC_NUMERIC_INPUT), mCDLStringPackHandle);
  gHexNumericInput   = LibGetToken (STRING_TOKEN (HEX_NUMERIC_INPUT), mCDLStringPackHandle);
  gToggleCheckBox    = LibGetToken (STRING_TOKEN (TOGGLE_CHECK_BOX), mCDLStringPackHandle);

  gAreYouSure   = LibGetToken (STRING_TOKEN (ARE_YOU_SURE), mCDLStringPackHandle);
  gYesResponse  = LibGetToken (STRING_TOKEN (ARE_YOU_SURE_YES), mCDLStringPackHandle);
  gNoResponse   = LibGetToken (STRING_TOKEN (ARE_YOU_SURE_NO), mCDLStringPackHandle);
  gPlusString   = LibGetToken (STRING_TOKEN (PLUS_STRING), mCDLStringPackHandle);
  gMinusString  = LibGetToken (STRING_TOKEN (MINUS_STRING), mCDLStringPackHandle);
  gAdjustNumber = LibGetToken (STRING_TOKEN (ADJUST_NUMBER), mCDLStringPackHandle);
  gSaveChanges  = LibGetToken (STRING_TOKEN (SAVE_CHANGES), mCDLStringPackHandle);

  gLibEmptyString = LibGetToken (STRING_TOKEN (EMPTY_STRING), mCDLStringPackHandle);

  gNvUpdateMessage   = LibGetToken (STRING_TOKEN (NV_UPDATE_MESSAGE), mCDLStringPackHandle);
  gInputErrorMessage = LibGetToken (STRING_TOKEN (INPUT_ERROR_MESSAGE), mCDLStringPackHandle);

  //
  // SpaceBuffer;
  //
  mSpaceBuffer = AllocatePool ((SPACE_BUFFER_SIZE + 1) * sizeof (CHAR16));
  ASSERT (mSpaceBuffer != NULL);
  LibSetUnicodeMem (mSpaceBuffer, SPACE_BUFFER_SIZE, L' ');
  mSpaceBuffer[SPACE_BUFFER_SIZE] = L'\0';
}

/**
  Free the HII String.

**/
VOID
FreeLibStrings (
  VOID
  )
{
  FreePool (gEnterString);
  FreePool (gEnterCommitString);
  FreePool (gEnterEscapeString);
  FreePool (gEscapeString);
  FreePool (gMoveHighlight);
  FreePool (gDecNumericInput);
  FreePool (gHexNumericInput);
  FreePool (gToggleCheckBox);

  FreePool (gAreYouSure);
  FreePool (gYesResponse);
  FreePool (gNoResponse);
  FreePool (gPlusString);
  FreePool (gMinusString);
  FreePool (gAdjustNumber);
  FreePool (gSaveChanges);

  FreePool (gLibEmptyString);

  FreePool (gNvUpdateMessage);
  FreePool (gInputErrorMessage);

  FreePool (mSpaceBuffer);
}

/**
  Wait for a key to be pressed by user.

  @param Key         The key which is pressed by user.

  @retval EFI_SUCCESS The function always completed successfully.

**/
EFI_STATUS
WaitForKeyStroke (
  OUT  EFI_INPUT_KEY  *Key
  )
{
  EFI_STATUS  Status;
  UINTN       Index;

  while (TRUE) {
    Status = gST->ConIn->ReadKeyStroke (gST->ConIn, Key);
    if (!EFI_ERROR (Status)) {
      break;
    }

    if (Status != EFI_NOT_READY) {
      continue;
    }

    gBS->WaitForEvent (1, &gST->ConIn->WaitForKey, &Index);
  }

  return Status;
}

/**
  Set Buffer to Value for Size bytes.

  @param  Buffer                 Memory to set.
  @param  Size                   Number of bytes to set
  @param  Value                  Value of the set operation.

**/
VOID
LibSetUnicodeMem (
  IN VOID    *Buffer,
  IN UINTN   Size,
  IN CHAR16  Value
  )
{
  CHAR16  *Ptr;

  Ptr = Buffer;
  while ((Size--)  != 0) {
    *(Ptr++) = Value;
  }
}

/**
  The internal function prints to the EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL
  protocol instance.

  @param Width           Width of string to be print.
  @param Column          The position of the output string.
  @param Row             The position of the output string.
  @param Out             The EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL instance.
  @param Fmt             The format string.
  @param Args            The additional argument for the variables in the format string.

  @return Number of Unicode character printed.

**/
UINTN
PrintInternal (
  IN UINTN                            Width,
  IN UINTN                            Column,
  IN UINTN                            Row,
  IN EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL  *Out,
  IN CHAR16                           *Fmt,
  IN VA_LIST                          Args
  )
{
  CHAR16  *Buffer;
  CHAR16  *BackupBuffer;
  UINTN   Index;
  UINTN   PreviousIndex;
  UINTN   Count;
  UINTN   TotalCount;
  UINTN   PrintWidth;
  UINTN   CharWidth;

  //
  // For now, allocate an arbitrarily long buffer
  //
  Buffer       = AllocateZeroPool (0x10000);
  BackupBuffer = AllocateZeroPool (0x10000);
  ASSERT (Buffer);
  ASSERT (BackupBuffer);

  if (Column != (UINTN)-1) {
    Out->SetCursorPosition (Out, Column, Row);
  }

  UnicodeVSPrint (Buffer, 0x10000, Fmt, Args);

  Out->Mode->Attribute = Out->Mode->Attribute & 0x7f;

  Out->SetAttribute (Out, Out->Mode->Attribute);

  Index         = 0;
  PreviousIndex = 0;
  Count         = 0;
  TotalCount    = 0;
  PrintWidth    = 0;
  CharWidth     = 1;

  do {
    for ( ; (Buffer[Index] != NARROW_CHAR) && (Buffer[Index] != WIDE_CHAR) && (Buffer[Index] != 0); Index++) {
      BackupBuffer[Index] = Buffer[Index];
    }

    if (Buffer[Index] == 0) {
      break;
    }

    //
    // Print this out, we are about to switch widths
    //
    Out->OutputString (Out, &BackupBuffer[PreviousIndex]);
    Count       = StrLen (&BackupBuffer[PreviousIndex]);
    PrintWidth += Count * CharWidth;
    TotalCount += Count;

    //
    // Preserve the current index + 1, since this is where we will start printing from next
    //
    PreviousIndex = Index + 1;

    //
    // We are at a narrow or wide character directive.  Set attributes and strip it and print it
    //
    if (Buffer[Index] == NARROW_CHAR) {
      //
      // Preserve bits 0 - 6 and zero out the rest
      //
      Out->Mode->Attribute = Out->Mode->Attribute & 0x7f;
      Out->SetAttribute (Out, Out->Mode->Attribute);
      CharWidth = 1;
    } else {
      //
      // Must be wide, set bit 7 ON
      //
      Out->Mode->Attribute = Out->Mode->Attribute | EFI_WIDE_ATTRIBUTE;
      Out->SetAttribute (Out, Out->Mode->Attribute);
      CharWidth = 2;
    }

    Index++;
  } while (Buffer[Index] != 0);

  //
  // We hit the end of the string - print it
  //
  Out->OutputString (Out, &BackupBuffer[PreviousIndex]);
  Count       = StrLen (&BackupBuffer[PreviousIndex]);
  PrintWidth += Count * CharWidth;
  TotalCount += Count;
  if (PrintWidth < Width) {
    Out->Mode->Attribute = Out->Mode->Attribute & 0x7f;
    Out->SetAttribute (Out, Out->Mode->Attribute);
    Out->OutputString (Out, &mSpaceBuffer[SPACE_BUFFER_SIZE - Width + PrintWidth]);
  }

  FreePool (Buffer);
  FreePool (BackupBuffer);
  return TotalCount;
}

/**
  Prints a formatted unicode string to the default console, at
  the supplied cursor position.

  @param  Width      Width of String to be printed.
  @param  Column     The cursor position to print the string at.
  @param  Row        The cursor position to print the string at.
  @param  Fmt        Format string.
  @param  ...        Variable argument list for format string.

  @return Length of string printed to the console

**/
UINTN
EFIAPI
PrintAt (
  IN UINTN   Width,
  IN UINTN   Column,
  IN UINTN   Row,
  IN CHAR16  *Fmt,
  ...
  )
{
  VA_LIST  Args;
  UINTN    LengthOfPrinted;

  VA_START (Args, Fmt);
  LengthOfPrinted = PrintInternal (Width, Column, Row, gST->ConOut, Fmt, Args);
  VA_END (Args);
  return LengthOfPrinted;
}