diff options
Diffstat (limited to 'MdeModulePkg/Universal/BdsDxe/Language.c')
| -rw-r--r-- | MdeModulePkg/Universal/BdsDxe/Language.c | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/MdeModulePkg/Universal/BdsDxe/Language.c b/MdeModulePkg/Universal/BdsDxe/Language.c new file mode 100644 index 0000000000..09127316fb --- /dev/null +++ b/MdeModulePkg/Universal/BdsDxe/Language.c @@ -0,0 +1,202 @@ +/** @file
+ Language settings
+
+Copyright (c) 2004 - 2015, 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.
+
+**/
+
+#include "Bds.h"
+#define ISO_639_2_ENTRY_SIZE 3
+
+/**
+ Check if lang is in supported language codes according to language string.
+
+ This code is used to check if lang is in in supported language codes. It can handle
+ RFC4646 and ISO639 language tags.
+ In ISO639 language tags, take 3-characters as a delimitation to find matched string.
+ In RFC4646 language tags, take semicolon as a delimitation to find matched string.
+
+ For example:
+ SupportedLang = "engfraengfra"
+ Iso639Language = TRUE
+ Lang = "eng", the return value is "TRUE", or
+ Lang = "chs", the return value is "FALSE".
+ Another example:
+ SupportedLang = "en;fr;en-US;fr-FR"
+ Iso639Language = FALSE
+ Lang = "en", the return value is "TRUE", or
+ Lang = "zh", the return value is "FALSE".
+
+ @param SupportedLang Platform supported language codes.
+ @param Lang Configured language.
+ @param Iso639Language A bool value to signify if the handler is operated on ISO639 or RFC4646.
+
+ @retval TRUE lang is in supported language codes.
+ @retval FALSE lang is not in supported language codes.
+
+**/
+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;
+ }
+}
+
+/**
+ Initialize Lang or PlatformLang variable, if Lang or PlatformLang variable is not found,
+ or it has been set to an unsupported value(not one of platform supported language codes),
+ set the default language code to it.
+
+ @param LangName Language name, L"Lang" or L"PlatformLang".
+ @param SupportedLang Platform supported language codes.
+ @param DefaultLang Default language code.
+ @param Iso639Language A bool value to signify if the handler is operated on ISO639 or RFC4646,
+ TRUE for L"Lang" LangName or FALSE for L"PlatformLang" LangName.
+
+**/
+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);
+ }
+}
+
+/**
+ Determine the current language that will be used
+ based on language related EFI Variables.
+
+ @param LangCodesSettingRequired - If required to set LangCodes variable
+
+**/
+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);
+}
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