Language.c

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#include "Bds.h"
#define ISO_639_2_ENTRY_SIZE  3
 
BOOLEAN
IsLangInSupportedLangCodes (
  IN  CHAR8    *SupportedLang,
  IN  CHAR8    *Lang,
  IN  BOOLEAN  Iso639Language
  )
{
  UINTN  Index;
  UINTN  CompareLength;
  UINTN  LanguageLength;
 
  if (Iso639Language) {
    CompareLength = ISO_639_2_ENTRY_SIZE;
    for (Index = 0; Index < AsciiStrLen (SupportedLang); Index += CompareLength) {
      if (AsciiStrnCmp (Lang, SupportedLang + Index, CompareLength) == 0) {
        //
        // Successfully find the Lang string in SupportedLang string.
        //
        return TRUE;
      }
    }
 
    return FALSE;
  } else {
    //
    // Compare RFC4646 language code
    //
    for (LanguageLength = 0; Lang[LanguageLength] != '\0'; LanguageLength++) {
    }
 
    for ( ; *SupportedLang != '\0'; SupportedLang += CompareLength) {
      //
      // Skip ';' characters in SupportedLang
      //
      for ( ; *SupportedLang != '\0' && *SupportedLang == ';'; SupportedLang++) {
      }
 
      //
      // Determine the length of the next language code in SupportedLang
      //
      for (CompareLength = 0; SupportedLang[CompareLength] != '\0' && SupportedLang[CompareLength] != ';'; CompareLength++) {
      }
 
      if ((CompareLength == LanguageLength) &&
          (AsciiStrnCmp (Lang, SupportedLang, CompareLength) == 0))
      {
        //
        // Successfully find the Lang string in SupportedLang string.
        //
        return TRUE;
      }
    }
 
    return FALSE;
  }
}
 
VOID
InitializeLangVariable (
  IN CHAR16   *LangName,
  IN CHAR8    *SupportedLang,
  IN CHAR8    *DefaultLang,
  IN BOOLEAN  Iso639Language
  )
{
  CHAR8  *Lang;
 
  //
  // Find current Lang or PlatformLang from EFI Variable.
  //
  GetEfiGlobalVariable2 (LangName, (VOID **)&Lang, NULL);
 
  //
  // If Lang or PlatformLang variable is not found,
  // or it has been set to an unsupported value(not one of the supported language codes),
  // set the default language code to it.
  //
  if ((Lang == NULL) || !IsLangInSupportedLangCodes (SupportedLang, Lang, Iso639Language)) {
    //
    // The default language code should be one of the supported language codes.
    //
    ASSERT (IsLangInSupportedLangCodes (SupportedLang, DefaultLang, Iso639Language));
    BdsDxeSetVariableAndReportStatusCodeOnError (
      LangName,
      &gEfiGlobalVariableGuid,
      EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
      AsciiStrSize (DefaultLang),
      DefaultLang
      );
  }
 
  if (Lang != NULL) {
    FreePool (Lang);
  }
}
 
VOID
InitializeLanguage (
  BOOLEAN  LangCodesSettingRequired
  )
{
  EFI_STATUS  Status;
  CHAR8       *LangCodes;
  CHAR8       *PlatformLangCodes;
 
  LangCodes         = (CHAR8 *)PcdGetPtr (PcdUefiVariableDefaultLangCodes);
  PlatformLangCodes = (CHAR8 *)PcdGetPtr (PcdUefiVariableDefaultPlatformLangCodes);
  if (LangCodesSettingRequired) {
    if (!FeaturePcdGet (PcdUefiVariableDefaultLangDeprecate)) {
      //
      // UEFI 2.1 depricated this variable so we support turning it off
      //
      Status = gRT->SetVariable (
                      L"LangCodes",
                      &gEfiGlobalVariableGuid,
                      EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
                      AsciiStrSize (LangCodes),
                      LangCodes
                      );
      //
      // Platform needs to make sure setting volatile variable before calling 3rd party code shouldn't fail.
      //
      ASSERT_EFI_ERROR (Status);
    }
 
    Status = gRT->SetVariable (
                    L"PlatformLangCodes",
                    &gEfiGlobalVariableGuid,
                    EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
                    AsciiStrSize (PlatformLangCodes),
                    PlatformLangCodes
                    );
    //
    // Platform needs to make sure setting volatile variable before calling 3rd party code shouldn't fail.
    //
    ASSERT_EFI_ERROR (Status);
  }
 
  if (!FeaturePcdGet (PcdUefiVariableDefaultLangDeprecate)) {
    //
    // UEFI 2.1 depricated this variable so we support turning it off
    //
    InitializeLangVariable (L"Lang", LangCodes, (CHAR8 *)PcdGetPtr (PcdUefiVariableDefaultLang), TRUE);
  }
 
  InitializeLangVariable (L"PlatformLang", PlatformLangCodes, (CHAR8 *)PcdGetPtr (PcdUefiVariableDefaultPlatformLang), FALSE);
}