Dxe/EfiIfrSupportLib/IfrOnTheFly.c

/*++
Copyright (c) 2004, Intel Corporation. All rights reserved.<BR>
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.

Module Name:
  IfrOnTheFly.c

Abstract:

  Library Routines to create IFR on-the-fly

Revision History:

--*/

#include "IfrLibrary.h"

#ifdef SUPPORT_DEPRECATED_IFRSUPPORTLIB_API

EFI_STATUS
CreateFormSet (
  IN      CHAR16              *FormSetTitle,
  IN      EFI_GUID            *Guid,
  IN      UINT8               Class,
  IN      UINT8               SubClass,
  IN OUT  VOID                **FormBuffer,
  IN OUT  VOID                **StringBuffer
  )
/*++

Routine Description:

  Create a formset

Arguments:

  FormSetTitle        - Title of formset

  Guid                - Guid of formset

  Class               - Class of formset

  SubClass            - Sub class of formset

  FormBuffer          - Pointer of the formset created

  StringBuffer        - Pointer of FormSetTitile string created

Returns:

  EFI_OUT_OF_RESOURCES    - No enough buffer to allocate

  EFI_SUCCESS             - Formset successfully created

--*/
{
  EFI_STATUS            Status;
  EFI_HII_IFR_PACK      IfrPack;
  EFI_IFR_FORM_SET      FormSet;
  EFI_IFR_END_FORM_SET  EndFormSet;
  UINT8                 *Destination;
  CHAR16                CurrentLanguage[4];
  STRING_REF            StringToken;

  //
  // Pre-allocate a buffer sufficient for us to work from.
  //
  FormBuffer = EfiLibAllocateZeroPool (DEFAULT_FORM_BUFFER_SIZE);
  if (FormBuffer == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  //
  // Pre-allocate a buffer sufficient for us to work from.
  //
  StringBuffer = EfiLibAllocateZeroPool (DEFAULT_STRING_BUFFER_SIZE);
  if (StringBuffer == NULL) {
    gBS->FreePool (FormBuffer);
    return EFI_OUT_OF_RESOURCES;
  }

  //
  // Obtain current language value
  //
  GetCurrentLanguage (CurrentLanguage);

  //
  // Add the FormSetTitle to the string buffer and get the StringToken
  //
  Status = AddString (*StringBuffer, CurrentLanguage, FormSetTitle, &StringToken);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  //
  // Initialize the Ifr Package header data
  //
  IfrPack.Header.Length = sizeof (EFI_HII_PACK_HEADER) + sizeof (EFI_IFR_FORM_SET) + sizeof (EFI_IFR_END_FORM_SET);
  IfrPack.Header.Type   = EFI_HII_IFR;

  //
  // Initialize FormSet with the appropriate information
  //
  FormSet.Header.OpCode = EFI_IFR_FORM_SET_OP;
  FormSet.Header.Length = sizeof (EFI_IFR_FORM_SET);
  FormSet.FormSetTitle  = StringToken;
  FormSet.Class         = Class;
  FormSet.SubClass      = SubClass;
  EfiCopyMem (&FormSet.Guid, Guid, sizeof (EFI_GUID));

  //
  // Initialize the end formset data
  //
  EndFormSet.Header.Length  = sizeof (EFI_IFR_END_FORM_SET);
  EndFormSet.Header.OpCode  = EFI_IFR_END_FORM_SET_OP;

  Destination               = (CHAR8 *) *FormBuffer;

  //
  // Copy the formset/endformset data to the form buffer
  //
  EfiCopyMem (Destination, &IfrPack, sizeof (EFI_HII_PACK_HEADER));

  Destination = Destination + sizeof (EFI_HII_PACK_HEADER);

  EfiCopyMem (Destination, &FormSet, sizeof (EFI_IFR_FORM_SET));

  Destination = Destination + sizeof (EFI_IFR_FORM_SET);

  EfiCopyMem (Destination, &EndFormSet, sizeof (EFI_IFR_END_FORM_SET));
  return EFI_SUCCESS;
}


EFI_STATUS
CreateForm (
  IN      CHAR16              *FormTitle,
  IN      UINT16              FormId,
  IN OUT  VOID                *FormBuffer,
  IN OUT  VOID                *StringBuffer
  )
/*++

Routine Description:

  Create a form

Arguments:

  FormTitle       - Title of the form

  FormId          - Id of the form

  FormBuffer          - Pointer of the form created

  StringBuffer        - Pointer of FormTitil string created

Returns:

  EFI_SUCCESS     - Form successfully created

--*/
{
  EFI_STATUS        Status;
  EFI_IFR_FORM      Form;
  EFI_IFR_END_FORM  EndForm;
  CHAR16            CurrentLanguage[4];
  STRING_REF        StringToken;

  //
  // Obtain current language value
  //
  GetCurrentLanguage (CurrentLanguage);

  Status = AddString (StringBuffer, CurrentLanguage, FormTitle, &StringToken);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  Form.Header.OpCode  = EFI_IFR_FORM_OP;
  Form.Header.Length  = sizeof (EFI_IFR_FORM);
  Form.FormId         = FormId;
  Form.FormTitle      = StringToken;

  Status              = AddOpCode (FormBuffer, &Form);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  EndForm.Header.OpCode = EFI_IFR_END_FORM_OP;
  EndForm.Header.Length = sizeof (EFI_IFR_END_FORM);

  Status                = AddOpCode (FormBuffer, &EndForm);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  return EFI_SUCCESS;
}


EFI_STATUS
CreateSubTitle (
  IN      CHAR16              *SubTitle,
  IN OUT  VOID                *FormBuffer,
  IN OUT  VOID                *StringBuffer
  )
/*++

Routine Description:

  Create a SubTitle

Arguments:

  SubTitle        - Sub title to be created

  FormBuffer      - Where this subtitle to add to

  StringBuffer    - String buffer created for subtitle

Returns:

  EFI_SUCCESS     - Subtitle successfully created

--*/
{
  EFI_STATUS        Status;
  EFI_IFR_SUBTITLE  Subtitle;
  CHAR16            CurrentLanguage[4];
  STRING_REF        StringToken;

  //
  // Obtain current language value
  //
  GetCurrentLanguage (CurrentLanguage);

  Status = AddString (StringBuffer, CurrentLanguage, SubTitle, &StringToken);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  Subtitle.Header.OpCode  = EFI_IFR_SUBTITLE_OP;
  Subtitle.Header.Length  = sizeof (EFI_IFR_SUBTITLE);
  Subtitle.SubTitle       = StringToken;

  Status                  = AddOpCode (FormBuffer, &Subtitle);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  return EFI_SUCCESS;
}


EFI_STATUS
CreateText (
  IN      CHAR16              *String,
  IN      CHAR16              *String2,
  IN      CHAR16              *String3,
  IN      UINT8               Flags,
  IN      UINT16              Key,
  IN OUT  VOID                *FormBuffer,
  IN OUT  VOID                *StringBuffer
  )
/*++

Routine Description:

  Create a line of text

Arguments:

  String          - First string of the text

  String2         - Second string of the text

  String3         - Help string of the text

  Flags           - Flag of the text

  Key             - Key of the text

  FormBuffer      - The form where this text adds to

  StringBuffer    - String buffer created for String, String2 and String3

Returns:

  EFI_SUCCESS     - Text successfully created

--*/
{
  EFI_STATUS    Status;
  EFI_IFR_TEXT  Text;
  CHAR16        CurrentLanguage[4];
  STRING_REF    StringToken;

  //
  // Obtain current language value
  //
  GetCurrentLanguage (CurrentLanguage);

  //
  // Add first string, get first string's token
  //
  Status = AddString (StringBuffer, CurrentLanguage, String, &StringToken);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  Text.Header.OpCode  = EFI_IFR_TEXT_OP;
  Text.Header.Length  = sizeof (EFI_IFR_TEXT);
  Text.Text           = StringToken;

  //
  // Add second string, get first string's token
  //
  Status = AddString (StringBuffer, CurrentLanguage, String2, &StringToken);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  Text.TextTwo  = StringToken;

  Text.Flags    = (UINT8) (Flags | EFI_IFR_FLAG_CREATED);
  Text.Key      = Key;

  //
  // Add second string, get first string's token
  //
  Status = AddString (StringBuffer, CurrentLanguage, String3, &StringToken);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  Text.Help = StringToken;

  Status    = AddOpCode (FormBuffer, &Text);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  return EFI_SUCCESS;
}


EFI_STATUS
CreateGoto (
  IN      UINT16              FormId,
  IN      CHAR16              *Prompt,
  IN OUT  VOID                *FormBuffer,
  IN OUT  VOID                *StringBuffer
  )
/*++

Routine Description:

  Create a hyperlink

Arguments:

  FormId        - Form ID of the hyperlink

  Prompt        - Prompt of the hyperlink

  FormBuffer    - The form where this hyperlink adds to

  StringBuffer  - String buffer created for Prompt

Returns:

  EFI_SUCCESS     - Hyperlink successfully created

--*/
{
  EFI_STATUS  Status;
  EFI_IFR_REF Hyperlink;
  CHAR16      CurrentLanguage[4];
  STRING_REF  StringToken;

  //
  // Obtain current language value
  //
  GetCurrentLanguage (CurrentLanguage);

  Status = AddString (StringBuffer, CurrentLanguage, Prompt, &StringToken);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  Hyperlink.Header.OpCode = EFI_IFR_REF_OP;
  Hyperlink.Header.Length = sizeof (EFI_IFR_REF);
  Hyperlink.FormId        = FormId;
  Hyperlink.Prompt        = StringToken;

  Status                  = AddOpCode (FormBuffer, &Hyperlink);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  return EFI_SUCCESS;
}


EFI_STATUS
CreateOneOf (
  IN      UINT16              QuestionId,
  IN      UINT8               DataWidth,
  IN      CHAR16              *Prompt,
  IN      CHAR16              *Help,
  IN      IFR_OPTION          *OptionsList,
  IN      UINTN               OptionCount,
  IN OUT  VOID                *FormBuffer,
  IN OUT  VOID                *StringBuffer
  )
/*++

Routine Description:

  Create a one-of question with a set of options to choose from.  The
  OptionsList is a pointer to a null-terminated list of option descriptions.

Arguments:

  QuestionId      - Question ID of the one-of box

  DataWidth       - DataWidth of the one-of box

  Prompt          - Prompt of the one-of box

  Help            - Help of the one-of box

  OptionsList     - Each string in it is an option of the one-of box

  OptionCount     - Option string count

  FormBuffer      - The form where this one-of box adds to

  StringBuffer    - String buffer created for Prompt, Help and Option strings

Returns:

  EFI_DEVICE_ERROR    - DataWidth > 2

  EFI_SUCCESS         - One-Of box successfully created.

--*/
{
  EFI_STATUS            Status;
  UINTN                 Index;
  EFI_IFR_ONE_OF        OneOf;
  EFI_IFR_ONE_OF_OPTION OneOfOption;
  EFI_IFR_END_ONE_OF    EndOneOf;
  CHAR16                CurrentLanguage[4];
  STRING_REF            StringToken;

  //
  // We do not create op-code storage widths for one-of in excess of 16 bits for now
  //
  if (DataWidth > 2) {
    return EFI_DEVICE_ERROR;
  }

  //
  // Obtain current language value
  //
  GetCurrentLanguage (CurrentLanguage);

  //
  // Add first string, get first string's token
  //
  Status = AddString (StringBuffer, CurrentLanguage, Prompt, &StringToken);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  OneOf.Header.OpCode = EFI_IFR_ONE_OF_OP;
  OneOf.Header.Length = sizeof (EFI_IFR_ONE_OF);
  OneOf.QuestionId    = QuestionId;
  OneOf.Width         = DataWidth;
  OneOf.Prompt        = StringToken;

  //
  // Add second string, get first string's token
  //
  Status = AddString (StringBuffer, CurrentLanguage, Help, &StringToken);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  OneOf.Help  = StringToken;

  Status      = AddOpCode (FormBuffer, &OneOf);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  for (Index = 0; Index < OptionCount; Index++) {
    OneOfOption.Header.OpCode = EFI_IFR_ONE_OF_OPTION_OP;
    OneOfOption.Header.Length = sizeof (EFI_IFR_ONE_OF_OPTION);

    //
    // Add string and get token back
    //
    Status              = AddString (StringBuffer, CurrentLanguage, OptionsList[Index].OptionString, &StringToken);

    OneOfOption.Option  = StringToken;
    OneOfOption.Value   = OptionsList[Index].Value;
    OneOfOption.Flags   = (UINT8) (OptionsList[Index].Flags | EFI_IFR_FLAG_CREATED);
    OneOfOption.Key     = OptionsList[Index].Key;

    Status              = AddOpCode (FormBuffer, &OneOfOption);

    if (EFI_ERROR (Status)) {
      return Status;
    }
  }

  EndOneOf.Header.Length  = sizeof (EFI_IFR_END_ONE_OF);
  EndOneOf.Header.OpCode  = EFI_IFR_END_ONE_OF_OP;

  Status                  = AddOpCode (FormBuffer, &EndOneOf);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  return EFI_SUCCESS;
}

EFI_STATUS
CreateOrderedList (
  IN      UINT16              QuestionId,
  IN      UINT8               MaxEntries,
  IN      CHAR16              *Prompt,
  IN      CHAR16              *Help,
  IN      IFR_OPTION          *OptionsList,
  IN      UINTN               OptionCount,
  IN OUT  VOID                *FormBuffer,
  IN OUT  VOID                *StringBuffer
  )
/*++

Routine Description:

  Create a one-of question with a set of options to choose from.  The
  OptionsList is a pointer to a null-terminated list of option descriptions.

Arguments:

  QuestionId      - Question ID of the ordered list

  MaxEntries      - MaxEntries of the ordered list

  Prompt          - Prompt of the ordered list

  Help            - Help of the ordered list

  OptionsList     - Each string in it is an option of the ordered list

  OptionCount     - Option string count

  FormBuffer      - The form where this ordered list adds to

  StringBuffer    - String buffer created for Prompt, Help and Option strings

Returns:

  EFI_SUCCESS     - Ordered list successfully created.

--*/
{
  EFI_STATUS            Status;
  UINTN                 Index;
  EFI_IFR_ORDERED_LIST  OrderedList;
  EFI_IFR_ONE_OF_OPTION OrderedListOption;
  EFI_IFR_END_ONE_OF    EndOrderedList;
  CHAR16                CurrentLanguage[4];
  STRING_REF            StringToken;

  //
  // Obtain current language value
  //
  GetCurrentLanguage (CurrentLanguage);

  //
  // Add first string, get first string's token
  //
  Status = AddString (StringBuffer, CurrentLanguage, Prompt, &StringToken);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  OrderedList.Header.OpCode = EFI_IFR_ORDERED_LIST_OP;
  OrderedList.Header.Length = sizeof (EFI_IFR_ORDERED_LIST);
  OrderedList.QuestionId    = QuestionId;
  OrderedList.MaxEntries    = MaxEntries;
  OrderedList.Prompt        = StringToken;

  //
  // Add second string, get first string's token
  //
  Status = AddString (StringBuffer, CurrentLanguage, Help, &StringToken);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  OrderedList.Help  = StringToken;

  Status            = AddOpCode (FormBuffer, &OrderedList);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  for (Index = 0; Index < OptionCount; Index++) {
    OrderedListOption.Header.OpCode = EFI_IFR_ONE_OF_OPTION_OP;
    OrderedListOption.Header.Length = sizeof (EFI_IFR_ONE_OF_OPTION);

    //
    // Add string and get token back
    //
    Status                    = AddString (StringBuffer, CurrentLanguage, OptionsList[Index].OptionString, &StringToken);

    OrderedListOption.Option  = StringToken;
    OrderedListOption.Value   = OptionsList[Index].Value;
    OrderedListOption.Flags   = (UINT8) (OptionsList[Index].Flags | EFI_IFR_FLAG_CREATED);
    OrderedListOption.Key     = OptionsList[Index].Key;

    Status                    = AddOpCode (FormBuffer, &OrderedListOption);

    if (EFI_ERROR (Status)) {
      return Status;
    }
  }

  EndOrderedList.Header.Length  = sizeof (EFI_IFR_END_ONE_OF);
  EndOrderedList.Header.OpCode  = EFI_IFR_END_ONE_OF_OP;

  Status                        = AddOpCode (FormBuffer, &EndOrderedList);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  return EFI_SUCCESS;
}


EFI_STATUS
CreateCheckBox (
  IN      UINT16              QuestionId,
  IN      UINT8               DataWidth,
  IN      CHAR16              *Prompt,
  IN      CHAR16              *Help,
  IN      UINT8               Flags,
  IN OUT  VOID                *FormBuffer,
  IN OUT  VOID                *StringBuffer
  )
/*++

Routine Description:

  Create a checkbox

Arguments:

  QuestionId      - Question ID of the check box

  DataWidth       - DataWidth of the check box

  Prompt          - Prompt of the check box

  Help            - Help of the check box

  Flags           - Flags of the check box

  FormBuffer      - The form where this check box adds to

  StringBuffer    - String buffer created for Prompt and Help.

Returns:

  EFI_DEVICE_ERROR    - DataWidth > 1

  EFI_SUCCESS         - Check box successfully created

--*/
{
  EFI_STATUS        Status;
  EFI_IFR_CHECK_BOX CheckBox;
  CHAR16            CurrentLanguage[4];
  STRING_REF        StringToken;

  //
  // We do not create op-code storage widths for checkbox in excess of 8 bits for now
  //
  if (DataWidth > 1) {
    return EFI_DEVICE_ERROR;
  }

  //
  // Obtain current language value
  //
  GetCurrentLanguage (CurrentLanguage);

  //
  // Add first string, get first string's token
  //
  Status = AddString (StringBuffer, CurrentLanguage, Prompt, &StringToken);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  CheckBox.Header.OpCode  = EFI_IFR_CHECKBOX_OP;
  CheckBox.Header.Length  = sizeof (EFI_IFR_CHECK_BOX);
  CheckBox.QuestionId     = QuestionId;
  CheckBox.Width          = DataWidth;
  CheckBox.Prompt         = StringToken;

  //
  // Add second string, get first string's token
  //
  Status = AddString (StringBuffer, CurrentLanguage, Help, &StringToken);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  CheckBox.Help   = StringToken;
  CheckBox.Flags  = (UINT8) (Flags | EFI_IFR_FLAG_CREATED);

  Status          = AddOpCode (FormBuffer, &CheckBox);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  return EFI_SUCCESS;
}


EFI_STATUS
CreateNumeric (
  IN      UINT16              QuestionId,
  IN      UINT8               DataWidth,
  IN      CHAR16              *Prompt,
  IN      CHAR16              *Help,
  IN      UINT16              Minimum,
  IN      UINT16              Maximum,
  IN      UINT16              Step,
  IN      UINT16              Default,
  IN      UINT8               Flags,
  IN      UINT16              Key,
  IN OUT  VOID                *FormBuffer,
  IN OUT  VOID                *StringBuffer
  )
/*++

Routine Description:

  Create a numeric

Arguments:

  QuestionId      - Question ID of the numeric

  DataWidth       - DataWidth of the numeric

  Prompt          - Prompt of the numeric

  Help            - Help of the numeric

  Minimum         - Minumun boundary of the numeric

  Maximum         - Maximum boundary of the numeric

  Step            - Step of the numeric

  Default         - Default value

  Flags           - Flags of the numeric

  Key             - Key of the numeric

  FormBuffer      - The form where this numeric adds to

  StringBuffer    - String buffer created for Prompt and Help.

Returns:

  EFI_DEVICE_ERROR      - DataWidth > 2

  EFI_SUCCESS           - Numeric is successfully created

--*/
{
  EFI_STATUS      Status;
  EFI_IFR_NUMERIC Numeric;
  CHAR16          CurrentLanguage[4];
  STRING_REF      StringToken;

  //
  // We do not create op-code storage widths for numerics in excess of 16 bits for now
  //
  if (DataWidth > 2) {
    return EFI_DEVICE_ERROR;
  }

  //
  // Obtain current language value
  //
  GetCurrentLanguage (CurrentLanguage);

  //
  // Add first string, get first string's token
  //
  Status = AddString (StringBuffer, CurrentLanguage, Prompt, &StringToken);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  Numeric.Header.OpCode = EFI_IFR_NUMERIC_OP;
  Numeric.Header.Length = sizeof (EFI_IFR_NUMERIC);
  Numeric.QuestionId    = QuestionId;
  Numeric.Width         = DataWidth;
  Numeric.Prompt        = StringToken;

  //
  // Add second string, get first string's token
  //
  Status = AddString (StringBuffer, CurrentLanguage, Help, &StringToken);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  Numeric.Help    = StringToken;
  Numeric.Minimum = Minimum;
  Numeric.Maximum = Maximum;
  Numeric.Step    = Step;
  Numeric.Default = Default;
  Numeric.Flags   = (UINT8) (Flags | EFI_IFR_FLAG_CREATED);
  Numeric.Key     = Key;

  Status          = AddOpCode (FormBuffer, &Numeric);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  return EFI_SUCCESS;
}


EFI_STATUS
CreateString (
  IN      UINT16              QuestionId,
  IN      UINT8               DataWidth,
  IN      CHAR16              *Prompt,
  IN      CHAR16              *Help,
  IN      UINT8               MinSize,
  IN      UINT8               MaxSize,
  IN      UINT8               Flags,
  IN      UINT16              Key,
  IN OUT  VOID                *FormBuffer,
  IN OUT  VOID                *StringBuffer
  )
/*++

Routine Description:

  Create a string

Arguments:

  QuestionId      - Question ID of the string

  DataWidth       - DataWidth of the string

  Prompt          - Prompt of the string

  Help            - Help of the string

  MinSize         - Min size boundary of the string

  MaxSize         - Max size boundary of the string

  Flags           - Flags of the string

  Key             - Key of the string

  FormBuffer      - The form where this string adds to

  StringBuffer    - String buffer created for Prompt and Help.

Returns:

  EFI_SUCCESS     - String successfully created.

--*/
{
  EFI_STATUS      Status;
  EFI_IFR_STRING  String;
  CHAR16          CurrentLanguage[4];
  STRING_REF      StringToken;

  //
  // Obtain current language value
  //
  GetCurrentLanguage (CurrentLanguage);

  //
  // Add first string, get first string's token
  //
  Status = AddString (StringBuffer, CurrentLanguage, Prompt, &StringToken);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  String.Header.OpCode  = EFI_IFR_STRING_OP;
  String.Header.Length  = sizeof (EFI_IFR_STRING);
  String.QuestionId     = QuestionId;
  String.Width          = DataWidth;
  String.Prompt         = StringToken;

  //
  // Add second string, get first string's token
  //
  Status = AddString (StringBuffer, CurrentLanguage, Help, &StringToken);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  String.Help     = StringToken;
  String.MinSize  = MinSize;
  String.MaxSize  = MaxSize;
  String.Flags    = (UINT8) (Flags | EFI_IFR_FLAG_CREATED);
  String.Key      = Key;

  Status          = AddOpCode (FormBuffer, &String);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  return EFI_SUCCESS;
}

#endif