audk/Nt32Pkg/MiscSubClassPlatformDxe/MiscNumberOfInstallableLanguagesFunction.c

/** @file
 
Copyright (c) 2009 - 2012, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include "MiscSubclassDriver.h"
/*++
  Check whether the language is supported for given HII handle

  @param   HiiHandle     The HII package list handle.
  @param   Offset        The offest of current lanague in the supported languages.
  @param   CurrentLang   The language code.

  @retval  TRUE          Supported.
  @retval  FALSE         Not Supported.

--*/
VOID
EFIAPI
CurrentLanguageMatch (
  IN  EFI_HII_HANDLE                   HiiHandle,
  OUT UINT16                           *Offset,
  OUT CHAR8                            *CurrentLang
  )
{
  CHAR8     *DefaultLang;
  CHAR8     *BestLanguage;
  CHAR8     *Languages;
  CHAR8     *MatchLang;
  CHAR8     *EndMatchLang;
  UINTN     CompareLength;
  
  Languages = HiiGetSupportedLanguages (HiiHandle);
  if (Languages == NULL) {
    return;
  }

  GetEfiGlobalVariable2 (L"PlatformLang", (VOID**)&CurrentLang, NULL);
  DefaultLang  = (CHAR8 *) PcdGetPtr (PcdUefiVariableDefaultPlatformLang);
  BestLanguage = GetBestLanguage (
                   Languages,
                   FALSE,
                   (CurrentLang != NULL) ? CurrentLang : "",
                   DefaultLang,
                   NULL
                   );
  if (BestLanguage != NULL) {
    //
    // Find the best matching RFC 4646 language, compute the offset.
    //
    CompareLength = AsciiStrLen (BestLanguage);
    for (MatchLang = Languages, (*Offset) = 0; MatchLang != '\0'; (*Offset)++) {
      //
      // Seek to the end of current match language. 
      //
      for (EndMatchLang = MatchLang; *EndMatchLang != '\0' && *EndMatchLang != ';'; EndMatchLang++);
  
      if ((EndMatchLang == MatchLang + CompareLength) && AsciiStrnCmp(MatchLang, BestLanguage, CompareLength) == 0) {
        //
        // Find the current best Language in the supported languages
        //
        break;
      }
      //
      // best language match be in the supported language.
      //
      ASSERT (*EndMatchLang == ';');
      MatchLang = EndMatchLang + 1;
    }
    FreePool (BestLanguage);
  }

  FreePool (Languages);
  if (CurrentLang != NULL) {
    FreePool (CurrentLang);
  }
  return ;
}


/**
  Get next language from language code list (with separator ';').

  @param  LangCode       Input: point to first language in the list. On
                         Otput: point to next language in the list, or
                                NULL if no more language in the list.
  @param  Lang           The first language in the list.

**/
VOID
EFIAPI
GetNextLanguage (
  IN OUT CHAR8      **LangCode,
  OUT CHAR8         *Lang
  )
{
  UINTN  Index;
  CHAR8  *StringPtr;

  ASSERT (LangCode != NULL);
  ASSERT (*LangCode != NULL);
  ASSERT (Lang != NULL);

  Index     = 0;
  StringPtr = *LangCode;
  while (StringPtr[Index] != 0 && StringPtr[Index] != ';') {
    Index++;
  }

  CopyMem (Lang, StringPtr, Index);
  Lang[Index] = 0;

  if (StringPtr[Index] == ';') {
    Index++;
  }
  *LangCode = StringPtr + Index;
}

/**
  This function returns the number of supported languages on HiiHandle.

  @param   HiiHandle    The HII package list handle.

  @retval  The number of supported languages.

**/
UINT16
EFIAPI
GetSupportedLanguageNumber (
  IN EFI_HII_HANDLE    HiiHandle
  )
{
  CHAR8   *Lang;
  CHAR8   *Languages;
  CHAR8   *LanguageString;
  UINT16  LangNumber;
  
  Languages = HiiGetSupportedLanguages (HiiHandle);
  if (Languages == NULL) {
    return 0;
  }

  LangNumber = 0;
  Lang = AllocatePool (AsciiStrSize (Languages));
  if (Lang != NULL) {
    LanguageString = Languages;
    while (*LanguageString != 0) {
      GetNextLanguage (&LanguageString, Lang);
      LangNumber++;
    }
    FreePool (Lang);
  }
  FreePool (Languages);
  return LangNumber;
}


/**
  This function makes boot time changes to the contents of the
  MiscNumberOfInstallableLanguages (Type 13).

  @param  RecordData                 Pointer to copy of RecordData from the Data Table.

  @retval EFI_SUCCESS                All parameters were valid.
  @retval EFI_UNSUPPORTED            Unexpected RecordType value.
  @retval EFI_INVALID_PARAMETER      Invalid parameter was found.

**/
MISC_SMBIOS_TABLE_FUNCTION(NumberOfInstallableLanguages)
{
  UINTN                                     LangStrLen;
  CHAR8                                     CurrentLang[SMBIOS_STRING_MAX_LENGTH + 1];
  CHAR8                                     *OptionalStrStart;
  UINT16                                    Offset;
  EFI_STATUS                                Status;
  EFI_SMBIOS_HANDLE                         SmbiosHandle;
  SMBIOS_TABLE_TYPE13                       *SmbiosRecord;
  EFI_MISC_NUMBER_OF_INSTALLABLE_LANGUAGES  *ForType13InputData;
 
  ForType13InputData = (EFI_MISC_NUMBER_OF_INSTALLABLE_LANGUAGES *)RecordData;

  //
  // First check for invalid parameters.
  //
  if (RecordData == NULL) {
    return EFI_INVALID_PARAMETER;
  }
  
  ForType13InputData->NumberOfInstallableLanguages = GetSupportedLanguageNumber (mHiiHandle);

  //
  // Try to check if current langcode matches with the langcodes in installed languages
  //
  ZeroMem(CurrentLang, SMBIOS_STRING_MAX_LENGTH + 1);
  CurrentLanguageMatch (mHiiHandle, &Offset, CurrentLang);
  LangStrLen = AsciiStrLen(CurrentLang);

  //
  // Two zeros following the last string.
  //
  SmbiosRecord = AllocatePool(sizeof (SMBIOS_TABLE_TYPE13) + LangStrLen + 1 + 1);
  ZeroMem(SmbiosRecord, sizeof (SMBIOS_TABLE_TYPE13) + LangStrLen + 1 + 1);

  SmbiosRecord->Hdr.Type = EFI_SMBIOS_TYPE_BIOS_LANGUAGE_INFORMATION;
  SmbiosRecord->Hdr.Length = sizeof (SMBIOS_TABLE_TYPE13);
  //
  // Make handle chosen by smbios protocol.add automatically.
  //
  SmbiosRecord->Hdr.Handle = 0;  

  SmbiosRecord->InstallableLanguages = (UINT8)ForType13InputData->NumberOfInstallableLanguages;
  SmbiosRecord->Flags = (UINT8)ForType13InputData->LanguageFlags.AbbreviatedLanguageFormat;
  SmbiosRecord->CurrentLanguages = 1;
  OptionalStrStart = (CHAR8 *)(SmbiosRecord + 1);
  AsciiStrCpy(OptionalStrStart, CurrentLang);
  //
  // Now we have got the full smbios record, call smbios protocol to add this record.
  //
  Status = AddSmbiosRecord (Smbios, &SmbiosHandle, (EFI_SMBIOS_TABLE_HEADER *) SmbiosRecord);

  FreePool(SmbiosRecord);
  return Status;
}