Implement IApplicationFunctions::GetDesiredLanguage

src/core/CMakeLists.txt

@@ -326,8 +326,11 @@ add_library(core STATIC
     hle/service/nim/nim.h
     hle/service/npns/npns.cpp
     hle/service/npns/npns.h
+    hle/service/ns/errors.h
     hle/service/ns/ns.cpp
     hle/service/ns/ns.h
+    hle/service/ns/ns_language.cpp
+    hle/service/ns/ns_language.h
     hle/service/ns/pl_u.cpp
     hle/service/ns/pl_u.h
     hle/service/nvdrv/devices/nvdevice.h

src/core/file_sys/control_metadata.cpp

@@ -87,6 +87,10 @@ u64 NACP::GetDefaultJournalSaveSize() const {
     return raw.user_account_save_data_journal_size;
 }
 
+u32 NACP::GetSupportedLanguages() const {
+    return raw.supported_languages;
+}
+
 std::vector<u8> NACP::GetRawBytes() const {
     std::vector<u8> out(sizeof(RawNACP));
     std::memcpy(out.data(), &raw, sizeof(RawNACP));

src/core/file_sys/control_metadata.h

@@ -109,6 +109,7 @@ public:
     std::string GetVersionString() const;
     u64 GetDefaultNormalSaveSize() const;
     u64 GetDefaultJournalSaveSize() const;
+    u32 GetSupportedLanguages() const;
     std::vector<u8> GetRawBytes() const;
 
 private:

src/core/hle/service/am/am.cpp

@@ -8,6 +8,8 @@
 #include <cstring>
 #include "audio_core/audio_renderer.h"
 #include "core/core.h"
+#include "core/file_sys/control_metadata.h"
+#include "core/file_sys/patch_manager.h"
 #include "core/file_sys/savedata_factory.h"
 #include "core/hle/ipc_helpers.h"
 #include "core/hle/kernel/kernel.h"
@@ -29,9 +31,11 @@
 #include "core/hle/service/am/tcap.h"
 #include "core/hle/service/apm/apm.h"
 #include "core/hle/service/filesystem/filesystem.h"
+#include "core/hle/service/ns/ns.h"
 #include "core/hle/service/nvflinger/nvflinger.h"
 #include "core/hle/service/pm/pm.h"
 #include "core/hle/service/set/set.h"
+#include "core/hle/service/sm/sm.h"
 #include "core/hle/service/vi/vi.h"
 #include "core/settings.h"
 
@@ -1100,10 +1104,42 @@ void IApplicationFunctions::GetDesiredLanguage(Kernel::HLERequestContext& ctx) {
     // TODO(bunnei): This should be configurable
     LOG_DEBUG(Service_AM, "called");
 
+    // Get supported languages from NACP, if possible
+    // Default to 0 (all languages supported)
+    u32 supported_languages = 0;
+    FileSys::PatchManager pm{Core::System::GetInstance().CurrentProcess()->GetTitleID()};
+
+    const auto res = pm.GetControlMetadata();
+    if (res.first != nullptr) {
+        supported_languages = res.first->GetSupportedLanguages();
+    }
+
+    // Call IApplicationManagerInterface implementation.
+    auto& service_manager = Core::System::GetInstance().ServiceManager();
+    auto ns_am2 = service_manager.GetService<Service::NS::NS>("ns:am2");
+    auto app_man = ns_am2->GetApplicationManagerInterface();
+
+    // Get desired application language
+    const auto res_lang = app_man->GetApplicationDesiredLanguage(supported_languages);
+    if (res_lang.Failed()) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(res_lang.Code());
+        return;
+    }
+
+    // Convert to settings language code.
+    const auto res_code = app_man->ConvertApplicationLanguageToLanguageCode(*res_lang);
+    if (res_code.Failed()) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(res_code.Code());
+        return;
+    }
+
+    LOG_DEBUG(Service_AM, "got desired_language={:016X}", *res_code);
+
     IPC::ResponseBuilder rb{ctx, 4};
     rb.Push(RESULT_SUCCESS);
-    rb.Push(
+    rb.Push(*res_code);
-        static_cast<u64>(Service::Set::GetLanguageCodeFromIndex(Settings::values.language_index)));
 }
 
 void IApplicationFunctions::InitializeGamePlayRecording(Kernel::HLERequestContext& ctx) {

src/core/hle/service/ns/errors.h

@@ -0,0 +1,13 @@
+// Copyright 2019 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "core/hle/result.h"
+
+namespace Service::NS {
+
+constexpr ResultCode ERR_APPLICATION_LANGUAGE_NOT_FOUND{ErrorModule::NS, 300};
+
+}

src/core/hle/service/ns/ns.cpp

@@ -7,14 +7,15 @@
 #include "core/file_sys/patch_manager.h"
 #include "core/hle/ipc_helpers.h"
 #include "core/hle/kernel/hle_ipc.h"
+#include "core/hle/service/ns/errors.h"
 #include "core/hle/service/ns/ns.h"
+#include "core/hle/service/ns/ns_language.h"
 #include "core/hle/service/ns/pl_u.h"
+#include "core/settings.h"
 
 namespace Service::NS {
 
-class IAccountProxyInterface final : public ServiceFramework<IAccountProxyInterface> {
+IAccountProxyInterface::IAccountProxyInterface() : ServiceFramework{"IAccountProxyInterface"} {
-public:
-    explicit IAccountProxyInterface() : ServiceFramework{"IAccountProxyInterface"} {
     // clang-format off
     static const FunctionInfo functions[] = {
         {0, nullptr, "CreateUserAccount"},
@@ -22,12 +23,10 @@ public:
     // clang-format on
 
     RegisterHandlers(functions);
-    }
+}
-};
 
-class IApplicationManagerInterface final : public ServiceFramework<IApplicationManagerInterface> {
+IApplicationManagerInterface::IApplicationManagerInterface()
-public:
+    : ServiceFramework{"IApplicationManagerInterface"} {
-    explicit IApplicationManagerInterface() : ServiceFramework{"IApplicationManagerInterface"} {
     // clang-format off
     static const FunctionInfo functions[] = {
         {0, nullptr, "ListApplicationRecord"},
@@ -70,11 +69,11 @@ public:
         {52, nullptr, "GetGameCardUpdateDetectionEvent"},
         {53, nullptr, "DisableApplicationAutoDelete"},
         {54, nullptr, "EnableApplicationAutoDelete"},
-            {55, nullptr, "GetApplicationDesiredLanguage"},
+        {55, &IApplicationManagerInterface::GetApplicationDesiredLanguage, "GetApplicationDesiredLanguage"},
         {56, nullptr, "SetApplicationTerminateResult"},
         {57, nullptr, "ClearApplicationTerminateResult"},
         {58, nullptr, "GetLastSdCardMountUnexpectedResult"},
-            {59, nullptr, "ConvertApplicationLanguageToLanguageCode"},
+        {59, &IApplicationManagerInterface::ConvertApplicationLanguageToLanguageCode, "ConvertApplicationLanguageToLanguageCode"},
         {60, nullptr, "ConvertLanguageCodeToApplicationLanguage"},
         {61, nullptr, "GetBackgroundDownloadStressTaskInfo"},
         {62, nullptr, "GetGameCardStopper"},
@@ -245,9 +244,9 @@ public:
     // clang-format on
 
     RegisterHandlers(functions);
-    }
+}
 
-    void GetApplicationControlData(Kernel::HLERequestContext& ctx) {
+void IApplicationManagerInterface::GetApplicationControlData(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp{ctx};
     const auto flag = rp.PopRaw<u64>();
     LOG_DEBUG(Service_NS, "called with flag={:016X}", flag);
@@ -264,8 +263,7 @@ public:
     if (control.first != nullptr) {
         if (size < 0x4000) {
             LOG_ERROR(Service_NS,
-                          "output buffer is too small! (actual={:016X}, expected_min=0x4000)",
+                      "output buffer is too small! (actual={:016X}, expected_min=0x4000)", size);
-                          size);
             IPC::ResponseBuilder rb{ctx, 2};
             // TODO(DarkLordZach): Find a better error code for this.
             rb.Push(ResultCode(-1));
@@ -284,8 +282,8 @@ public:
     if (control.second != nullptr) {
         if (size < 0x4000 + control.second->GetSize()) {
             LOG_ERROR(Service_NS,
-                          "output buffer is too small! (actual={:016X}, expected_min={:016X})",
+                      "output buffer is too small! (actual={:016X}, expected_min={:016X})", size,
-                          size, 0x4000 + control.second->GetSize());
+                      0x4000 + control.second->GetSize());
             IPC::ResponseBuilder rb{ctx, 2};
             // TODO(DarkLordZach): Find a better error code for this.
             rb.Push(ResultCode(-1));
@@ -304,12 +302,82 @@ public:
     IPC::ResponseBuilder rb{ctx, 3};
     rb.Push(RESULT_SUCCESS);
     rb.Push<u32>(static_cast<u32>(out.size()));
-    }
+}
-};
 
-class IApplicationVersionInterface final : public ServiceFramework<IApplicationVersionInterface> {
+void IApplicationManagerInterface::GetApplicationDesiredLanguage(Kernel::HLERequestContext& ctx) {
-public:
+    IPC::RequestParser rp{ctx};
-    explicit IApplicationVersionInterface() : ServiceFramework{"IApplicationVersionInterface"} {
+    const auto supported_languages = rp.Pop<u32>();
+
+    const auto res = GetApplicationDesiredLanguage(supported_languages);
+    if (res.Succeeded()) {
+        IPC::ResponseBuilder rb{ctx, 3};
+        rb.Push(RESULT_SUCCESS);
+        rb.Push<u32>(*res);
+    } else {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(res.Code());
+    }
+}
+
+ResultVal<u8> IApplicationManagerInterface::GetApplicationDesiredLanguage(
+    const u32 supported_languages) {
+    LOG_DEBUG(Service_NS, "called with supported_languages={:08X}", supported_languages);
+
+    // Get language code from settings
+    const auto language_code =
+        Service::Set::GetLanguageCodeFromIndex(Settings::values.language_index);
+
+    // Convert to application language, get priority list
+    const auto application_language = ConvertToApplicationLanguage(language_code);
+    if (application_language == std::nullopt) {
+        return ERR_APPLICATION_LANGUAGE_NOT_FOUND;
+    }
+    const auto priority_list = GetApplicationLanguagePriorityList(*application_language);
+    if (!priority_list) {
+        return ERR_APPLICATION_LANGUAGE_NOT_FOUND;
+    }
+
+    // Try to find a valid language.
+    for (const auto lang : *priority_list) {
+        const auto supported_flag = GetSupportedLanguageFlag(lang);
+        if (supported_languages == 0 ||
+            (supported_languages & supported_flag) == supported_languages) {
+            return ResultVal<u8>::WithCode(RESULT_SUCCESS, static_cast<u8>(lang));
+        }
+    }
+
+    return ERR_APPLICATION_LANGUAGE_NOT_FOUND;
+}
+
+void IApplicationManagerInterface::ConvertApplicationLanguageToLanguageCode(
+    Kernel::HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+    const auto application_language = rp.Pop<u8>();
+
+    const auto res = ConvertApplicationLanguageToLanguageCode(application_language);
+    if (res.Succeeded()) {
+        IPC::ResponseBuilder rb{ctx, 4};
+        rb.Push(RESULT_SUCCESS);
+        rb.Push(*res);
+    } else {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(res.Code());
+    }
+}
+
+ResultVal<u64> IApplicationManagerInterface::ConvertApplicationLanguageToLanguageCode(
+    u8 application_language) {
+    const auto language_code =
+        ConvertToLanguageCode(static_cast<ApplicationLanguage>(application_language));
+    if (language_code == std::nullopt) {
+        return ERR_APPLICATION_LANGUAGE_NOT_FOUND;
+    }
+
+    return ResultVal<u64>::WithCode(RESULT_SUCCESS, static_cast<u64>(*language_code));
+}
+
+IApplicationVersionInterface::IApplicationVersionInterface()
+    : ServiceFramework{"IApplicationVersionInterface"} {
     // clang-format off
     static const FunctionInfo functions[] = {
         {0, nullptr, "GetLaunchRequiredVersion"},
@@ -325,12 +393,10 @@ public:
     // clang-format on
 
     RegisterHandlers(functions);
-    }
+}
-};
 
-class IContentManagerInterface final : public ServiceFramework<IContentManagerInterface> {
+IContentManagerInterface::IContentManagerInterface()
-public:
+    : ServiceFramework{"IContentManagerInterface"} {
-    explicit IContentManagerInterface() : ServiceFramework{"IContentManagerInterface"} {
     // clang-format off
     static const FunctionInfo functions[] = {
         {11, nullptr, "CalculateApplicationOccupiedSize"},
@@ -345,12 +411,9 @@ public:
     // clang-format on
 
     RegisterHandlers(functions);
-    }
+}
-};
 
-class IDocumentInterface final : public ServiceFramework<IDocumentInterface> {
+IDocumentInterface::IDocumentInterface() : ServiceFramework{"IDocumentInterface"} {
-public:
-    explicit IDocumentInterface() : ServiceFramework{"IDocumentInterface"} {
     // clang-format off
     static const FunctionInfo functions[] = {
         {21, nullptr, "GetApplicationContentPath"},
@@ -360,12 +423,9 @@ public:
     // clang-format on
 
     RegisterHandlers(functions);
-    }
+}
-};
 
-class IDownloadTaskInterface final : public ServiceFramework<IDownloadTaskInterface> {
+IDownloadTaskInterface::IDownloadTaskInterface() : ServiceFramework{"IDownloadTaskInterface"} {
-public:
-    explicit IDownloadTaskInterface() : ServiceFramework{"IDownloadTaskInterface"} {
     // clang-format off
     static const FunctionInfo functions[] = {
         {701, nullptr, "ClearTaskStatusList"},
@@ -381,12 +441,9 @@ public:
     // clang-format on
 
     RegisterHandlers(functions);
-    }
+}
-};
 
-class IECommerceInterface final : public ServiceFramework<IECommerceInterface> {
+IECommerceInterface::IECommerceInterface() : ServiceFramework{"IECommerceInterface"} {
-public:
-    explicit IECommerceInterface() : ServiceFramework{"IECommerceInterface"} {
     // clang-format off
     static const FunctionInfo functions[] = {
         {0, nullptr, "RequestLinkDevice"},
@@ -399,12 +456,10 @@ public:
     // clang-format on
 
     RegisterHandlers(functions);
-    }
+}
-};
 
-class IFactoryResetInterface final : public ServiceFramework<IFactoryResetInterface> {
+IFactoryResetInterface::IFactoryResetInterface::IFactoryResetInterface()
-public:
+    : ServiceFramework{"IFactoryResetInterface"} {
-    explicit IFactoryResetInterface() : ServiceFramework{"IFactoryResetInterface"} {
     // clang-format off
         static const FunctionInfo functions[] = {
             {100, nullptr, "ResetToFactorySettings"},
@@ -414,12 +469,9 @@ public:
     // clang-format on
 
     RegisterHandlers(functions);
-    }
+}
-};
 
-class NS final : public ServiceFramework<NS> {
+NS::NS(const char* name) : ServiceFramework{name} {
-public:
-    explicit NS(const char* name) : ServiceFramework{name} {
     // clang-format off
     static const FunctionInfo functions[] = {
         {7992, &NS::PushInterface<IECommerceInterface>, "GetECommerceInterface"},
@@ -434,18 +486,11 @@ public:
     // clang-format on
 
     RegisterHandlers(functions);
-    }
+}
 
-private:
+std::shared_ptr<IApplicationManagerInterface> NS::GetApplicationManagerInterface() {
-    template <typename T>
+    return GetInterface<IApplicationManagerInterface>();
-    void PushInterface(Kernel::HLERequestContext& ctx) {
+}
-        LOG_DEBUG(Service_NS, "called");
-
-        IPC::ResponseBuilder rb{ctx, 2, 0, 1};
-        rb.Push(RESULT_SUCCESS);
-        rb.PushIpcInterface<T>();
-    }
-};
 
 class NS_DEV final : public ServiceFramework<NS_DEV> {
 public:

src/core/hle/service/ns/ns.h

@@ -5,9 +5,83 @@
 #pragma once
 
 #include "core/hle/service/service.h"
+#include "core/hle/service/set/set.h"
 
 namespace Service::NS {
 
+class IAccountProxyInterface final : public ServiceFramework<IAccountProxyInterface> {
+public:
+    explicit IAccountProxyInterface();
+};
+
+class IApplicationManagerInterface final : public ServiceFramework<IApplicationManagerInterface> {
+public:
+    explicit IApplicationManagerInterface();
+
+    ResultVal<u8> GetApplicationDesiredLanguage(u32 supported_languages);
+    ResultVal<u64> ConvertApplicationLanguageToLanguageCode(u8 application_language);
+
+private:
+    void GetApplicationControlData(Kernel::HLERequestContext& ctx);
+    void GetApplicationDesiredLanguage(Kernel::HLERequestContext& ctx);
+    void ConvertApplicationLanguageToLanguageCode(Kernel::HLERequestContext& ctx);
+};
+
+class IApplicationVersionInterface final : public ServiceFramework<IApplicationVersionInterface> {
+public:
+    explicit IApplicationVersionInterface();
+};
+
+class IContentManagerInterface final : public ServiceFramework<IContentManagerInterface> {
+public:
+    explicit IContentManagerInterface();
+};
+
+class IDocumentInterface final : public ServiceFramework<IDocumentInterface> {
+public:
+    explicit IDocumentInterface();
+};
+
+class IDownloadTaskInterface final : public ServiceFramework<IDownloadTaskInterface> {
+public:
+    explicit IDownloadTaskInterface();
+};
+
+class IECommerceInterface final : public ServiceFramework<IECommerceInterface> {
+public:
+    explicit IECommerceInterface();
+};
+
+class IFactoryResetInterface final : public ServiceFramework<IFactoryResetInterface> {
+public:
+    explicit IFactoryResetInterface();
+};
+
+class NS final : public ServiceFramework<NS> {
+public:
+    explicit NS(const char* name);
+
+    std::shared_ptr<IApplicationManagerInterface> GetApplicationManagerInterface();
+
+private:
+    template <typename T>
+    void PushInterface(Kernel::HLERequestContext& ctx) {
+        LOG_DEBUG(Service_NS, "called");
+
+        IPC::ResponseBuilder rb{ctx, 2, 0, 1};
+        rb.Push(RESULT_SUCCESS);
+        rb.PushIpcInterface<T>();
+    }
+
+    template<typename T>
+    std::shared_ptr<T> GetInterface() {
+        static_assert(std::is_base_of_v<Kernel::SessionRequestHandler, T>,
+                      "Not a base of ServiceFrameworkBase");
+
+        return std::make_shared<T>();
+    }
+};
+
 /// Registers all NS services with the specified service manager.
 void InstallInterfaces(SM::ServiceManager& service_manager);
 

src/core/hle/service/ns/ns_language.cpp

@@ -0,0 +1,390 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "core/hle/service/ns/ns_language.h"
+
+namespace Service::NS {
+
+constexpr ApplicationLanguagePriorityList priority_list_american_english = {{
+    ApplicationLanguage::AmericanEnglish,
+    ApplicationLanguage::BritishEnglish,
+    ApplicationLanguage::LatinAmericanSpanish,
+    ApplicationLanguage::CanadianFrench,
+    ApplicationLanguage::French,
+    ApplicationLanguage::German,
+    ApplicationLanguage::Spanish,
+    ApplicationLanguage::Italian,
+    ApplicationLanguage::Dutch,
+    ApplicationLanguage::Portuguese,
+    ApplicationLanguage::Russian,
+    ApplicationLanguage::Japanese,
+    ApplicationLanguage::SimplifiedChinese,
+    ApplicationLanguage::TraditionalChinese,
+    ApplicationLanguage::Korean,
+}};
+
+constexpr ApplicationLanguagePriorityList priority_list_british_english = {{
+    ApplicationLanguage::BritishEnglish,
+    ApplicationLanguage::AmericanEnglish,
+    ApplicationLanguage::French,
+    ApplicationLanguage::German,
+    ApplicationLanguage::Spanish,
+    ApplicationLanguage::Italian,
+    ApplicationLanguage::Dutch,
+    ApplicationLanguage::Portuguese,
+    ApplicationLanguage::Russian,
+    ApplicationLanguage::LatinAmericanSpanish,
+    ApplicationLanguage::CanadianFrench,
+    ApplicationLanguage::Japanese,
+    ApplicationLanguage::SimplifiedChinese,
+    ApplicationLanguage::TraditionalChinese,
+    ApplicationLanguage::Korean,
+}};
+
+constexpr ApplicationLanguagePriorityList priority_list_japanese = {{
+    ApplicationLanguage::Japanese,
+    ApplicationLanguage::AmericanEnglish,
+    ApplicationLanguage::BritishEnglish,
+    ApplicationLanguage::LatinAmericanSpanish,
+    ApplicationLanguage::CanadianFrench,
+    ApplicationLanguage::French,
+    ApplicationLanguage::German,
+    ApplicationLanguage::Spanish,
+    ApplicationLanguage::Italian,
+    ApplicationLanguage::Dutch,
+    ApplicationLanguage::Portuguese,
+    ApplicationLanguage::Russian,
+    ApplicationLanguage::SimplifiedChinese,
+    ApplicationLanguage::TraditionalChinese,
+    ApplicationLanguage::Korean,
+}};
+
+constexpr ApplicationLanguagePriorityList priority_list_french = {{
+    ApplicationLanguage::French,
+    ApplicationLanguage::CanadianFrench,
+    ApplicationLanguage::BritishEnglish,
+    ApplicationLanguage::AmericanEnglish,
+    ApplicationLanguage::German,
+    ApplicationLanguage::Spanish,
+    ApplicationLanguage::Italian,
+    ApplicationLanguage::Dutch,
+    ApplicationLanguage::Portuguese,
+    ApplicationLanguage::Russian,
+    ApplicationLanguage::LatinAmericanSpanish,
+    ApplicationLanguage::Japanese,
+    ApplicationLanguage::SimplifiedChinese,
+    ApplicationLanguage::TraditionalChinese,
+    ApplicationLanguage::Korean,
+}};
+
+constexpr ApplicationLanguagePriorityList priority_list_german = {{
+    ApplicationLanguage::German,
+    ApplicationLanguage::BritishEnglish,
+    ApplicationLanguage::AmericanEnglish,
+    ApplicationLanguage::French,
+    ApplicationLanguage::Spanish,
+    ApplicationLanguage::Italian,
+    ApplicationLanguage::Dutch,
+    ApplicationLanguage::Portuguese,
+    ApplicationLanguage::Russian,
+    ApplicationLanguage::LatinAmericanSpanish,
+    ApplicationLanguage::CanadianFrench,
+    ApplicationLanguage::Japanese,
+    ApplicationLanguage::SimplifiedChinese,
+    ApplicationLanguage::TraditionalChinese,
+    ApplicationLanguage::Korean,
+}};
+
+constexpr ApplicationLanguagePriorityList priority_list_latin_american_spanish = {{
+    ApplicationLanguage::LatinAmericanSpanish,
+    ApplicationLanguage::Spanish,
+    ApplicationLanguage::AmericanEnglish,
+    ApplicationLanguage::BritishEnglish,
+    ApplicationLanguage::Portuguese,
+    ApplicationLanguage::CanadianFrench,
+    ApplicationLanguage::French,
+    ApplicationLanguage::Italian,
+    ApplicationLanguage::German,
+    ApplicationLanguage::Dutch,
+    ApplicationLanguage::Russian,
+    ApplicationLanguage::Japanese,
+    ApplicationLanguage::SimplifiedChinese,
+    ApplicationLanguage::TraditionalChinese,
+    ApplicationLanguage::Korean,
+}};
+
+constexpr ApplicationLanguagePriorityList priority_list_spanish = {{
+    ApplicationLanguage::Spanish,
+    ApplicationLanguage::LatinAmericanSpanish,
+    ApplicationLanguage::BritishEnglish,
+    ApplicationLanguage::AmericanEnglish,
+    ApplicationLanguage::French,
+    ApplicationLanguage::German,
+    ApplicationLanguage::Italian,
+    ApplicationLanguage::Dutch,
+    ApplicationLanguage::Portuguese,
+    ApplicationLanguage::Russian,
+    ApplicationLanguage::CanadianFrench,
+    ApplicationLanguage::Japanese,
+    ApplicationLanguage::SimplifiedChinese,
+    ApplicationLanguage::TraditionalChinese,
+    ApplicationLanguage::Korean,
+}};
+
+constexpr ApplicationLanguagePriorityList priority_list_italian = {{
+    ApplicationLanguage::Italian,
+    ApplicationLanguage::BritishEnglish,
+    ApplicationLanguage::AmericanEnglish,
+    ApplicationLanguage::French,
+    ApplicationLanguage::German,
+    ApplicationLanguage::Spanish,
+    ApplicationLanguage::Dutch,
+    ApplicationLanguage::Portuguese,
+    ApplicationLanguage::Russian,
+    ApplicationLanguage::LatinAmericanSpanish,
+    ApplicationLanguage::CanadianFrench,
+    ApplicationLanguage::Japanese,
+    ApplicationLanguage::SimplifiedChinese,
+    ApplicationLanguage::TraditionalChinese,
+    ApplicationLanguage::Korean,
+}};
+
+constexpr ApplicationLanguagePriorityList priority_list_dutch = {{
+    ApplicationLanguage::Dutch,
+    ApplicationLanguage::BritishEnglish,
+    ApplicationLanguage::AmericanEnglish,
+    ApplicationLanguage::French,
+    ApplicationLanguage::German,
+    ApplicationLanguage::Spanish,
+    ApplicationLanguage::Italian,
+    ApplicationLanguage::Portuguese,
+    ApplicationLanguage::Russian,
+    ApplicationLanguage::LatinAmericanSpanish,
+    ApplicationLanguage::CanadianFrench,
+    ApplicationLanguage::Japanese,
+    ApplicationLanguage::SimplifiedChinese,
+    ApplicationLanguage::TraditionalChinese,
+    ApplicationLanguage::Korean,
+}};
+
+constexpr ApplicationLanguagePriorityList priority_list_canadian_french = {{
+    ApplicationLanguage::CanadianFrench,
+    ApplicationLanguage::French,
+    ApplicationLanguage::AmericanEnglish,
+    ApplicationLanguage::BritishEnglish,
+    ApplicationLanguage::LatinAmericanSpanish,
+    ApplicationLanguage::Spanish,
+    ApplicationLanguage::German,
+    ApplicationLanguage::Italian,
+    ApplicationLanguage::Dutch,
+    ApplicationLanguage::Portuguese,
+    ApplicationLanguage::Russian,
+    ApplicationLanguage::Japanese,
+    ApplicationLanguage::SimplifiedChinese,
+    ApplicationLanguage::TraditionalChinese,
+    ApplicationLanguage::Korean,
+}};
+
+constexpr ApplicationLanguagePriorityList priority_list_portuguese = {{
+    ApplicationLanguage::Portuguese,
+    ApplicationLanguage::BritishEnglish,
+    ApplicationLanguage::AmericanEnglish,
+    ApplicationLanguage::French,
+    ApplicationLanguage::German,
+    ApplicationLanguage::Spanish,
+    ApplicationLanguage::Italian,
+    ApplicationLanguage::Dutch,
+    ApplicationLanguage::Russian,
+    ApplicationLanguage::LatinAmericanSpanish,
+    ApplicationLanguage::CanadianFrench,
+    ApplicationLanguage::Japanese,
+    ApplicationLanguage::SimplifiedChinese,
+    ApplicationLanguage::TraditionalChinese,
+    ApplicationLanguage::Korean,
+}};
+
+constexpr ApplicationLanguagePriorityList priority_list_russian = {{
+    ApplicationLanguage::Russian,
+    ApplicationLanguage::BritishEnglish,
+    ApplicationLanguage::AmericanEnglish,
+    ApplicationLanguage::French,
+    ApplicationLanguage::German,
+    ApplicationLanguage::Spanish,
+    ApplicationLanguage::Italian,
+    ApplicationLanguage::Dutch,
+    ApplicationLanguage::Portuguese,
+    ApplicationLanguage::LatinAmericanSpanish,
+    ApplicationLanguage::CanadianFrench,
+    ApplicationLanguage::Japanese,
+    ApplicationLanguage::SimplifiedChinese,
+    ApplicationLanguage::TraditionalChinese,
+    ApplicationLanguage::Korean,
+}};
+
+constexpr ApplicationLanguagePriorityList priority_list_korean = {{
+    ApplicationLanguage::Korean,
+    ApplicationLanguage::AmericanEnglish,
+    ApplicationLanguage::BritishEnglish,
+    ApplicationLanguage::LatinAmericanSpanish,
+    ApplicationLanguage::CanadianFrench,
+    ApplicationLanguage::French,
+    ApplicationLanguage::German,
+    ApplicationLanguage::Spanish,
+    ApplicationLanguage::Italian,
+    ApplicationLanguage::Dutch,
+    ApplicationLanguage::Portuguese,
+    ApplicationLanguage::Russian,
+    ApplicationLanguage::Japanese,
+    ApplicationLanguage::SimplifiedChinese,
+    ApplicationLanguage::TraditionalChinese,
+}};
+
+constexpr ApplicationLanguagePriorityList priority_list_traditional_chinese = {{
+    ApplicationLanguage::TraditionalChinese,
+    ApplicationLanguage::SimplifiedChinese,
+    ApplicationLanguage::AmericanEnglish,
+    ApplicationLanguage::BritishEnglish,
+    ApplicationLanguage::Japanese,
+    ApplicationLanguage::LatinAmericanSpanish,
+    ApplicationLanguage::CanadianFrench,
+    ApplicationLanguage::French,
+    ApplicationLanguage::German,
+    ApplicationLanguage::Spanish,
+    ApplicationLanguage::Italian,
+    ApplicationLanguage::Dutch,
+    ApplicationLanguage::Portuguese,
+    ApplicationLanguage::Russian,
+    ApplicationLanguage::Korean,
+}};
+
+constexpr ApplicationLanguagePriorityList priority_list_simplified_chinese = {{
+    ApplicationLanguage::SimplifiedChinese,
+    ApplicationLanguage::TraditionalChinese,
+    ApplicationLanguage::AmericanEnglish,
+    ApplicationLanguage::BritishEnglish,
+    ApplicationLanguage::Japanese,
+    ApplicationLanguage::LatinAmericanSpanish,
+    ApplicationLanguage::CanadianFrench,
+    ApplicationLanguage::French,
+    ApplicationLanguage::German,
+    ApplicationLanguage::Spanish,
+    ApplicationLanguage::Italian,
+    ApplicationLanguage::Dutch,
+    ApplicationLanguage::Portuguese,
+    ApplicationLanguage::Russian,
+    ApplicationLanguage::Korean,
+}};
+
+const ApplicationLanguagePriorityList* GetApplicationLanguagePriorityList(ApplicationLanguage lang) {
+    switch (lang) {
+    case ApplicationLanguage::AmericanEnglish:
+        return &priority_list_american_english;
+    case ApplicationLanguage::BritishEnglish:
+        return &priority_list_british_english;
+    case ApplicationLanguage::Japanese:
+        return &priority_list_japanese;
+    case ApplicationLanguage::French:
+        return &priority_list_french;
+    case ApplicationLanguage::German:
+        return &priority_list_german;
+    case ApplicationLanguage::LatinAmericanSpanish:
+        return &priority_list_latin_american_spanish;
+    case ApplicationLanguage::Spanish:
+        return &priority_list_spanish;
+    case ApplicationLanguage::Italian:
+        return &priority_list_italian;
+    case ApplicationLanguage::Dutch:
+        return &priority_list_dutch;
+    case ApplicationLanguage::CanadianFrench:
+        return &priority_list_canadian_french;
+    case ApplicationLanguage::Portuguese:
+        return &priority_list_portuguese;
+    case ApplicationLanguage::Russian:
+        return &priority_list_russian;
+    case ApplicationLanguage::Korean:
+        return &priority_list_korean;
+    case ApplicationLanguage::TraditionalChinese:
+        return &priority_list_traditional_chinese;
+    case ApplicationLanguage::SimplifiedChinese:
+        return &priority_list_simplified_chinese;
+    default:
+        return nullptr;
+    }
+}
+
+std::optional<ApplicationLanguage> ConvertToApplicationLanguage(
+    const Service::Set::LanguageCode language_code) {
+    switch (language_code) {
+    case Service::Set::LanguageCode::EN_US:
+        return ApplicationLanguage::AmericanEnglish;
+    case Service::Set::LanguageCode::EN_GB:
+        return ApplicationLanguage::BritishEnglish;
+    case Service::Set::LanguageCode::JA:
+        return ApplicationLanguage::Japanese;
+    case Service::Set::LanguageCode::FR:
+        return ApplicationLanguage::French;
+    case Service::Set::LanguageCode::DE:
+        return ApplicationLanguage::German;
+    case Service::Set::LanguageCode::ES_419:
+        return ApplicationLanguage::LatinAmericanSpanish;
+    case Service::Set::LanguageCode::ES:
+        return ApplicationLanguage::Spanish;
+    case Service::Set::LanguageCode::IT:
+        return ApplicationLanguage::Italian;
+    case Service::Set::LanguageCode::NL:
+        return ApplicationLanguage::Dutch;
+    case Service::Set::LanguageCode::FR_CA:
+        return ApplicationLanguage::CanadianFrench;
+    case Service::Set::LanguageCode::PT:
+        return ApplicationLanguage::Portuguese;
+    case Service::Set::LanguageCode::RU:
+        return ApplicationLanguage::Russian;
+    case Service::Set::LanguageCode::KO:
+        return ApplicationLanguage::Korean;
+    case Service::Set::LanguageCode::ZH_HANT:
+        return ApplicationLanguage::TraditionalChinese;
+    case Service::Set::LanguageCode::ZH_HANS:
+        return ApplicationLanguage::SimplifiedChinese;
+    default:
+        return std::nullopt;
+    }
+}
+
+std::optional<Service::Set::LanguageCode> ConvertToLanguageCode(const ApplicationLanguage lang) {
+    switch (lang) {
+    case ApplicationLanguage::AmericanEnglish:
+        return Service::Set::LanguageCode::EN_US;
+    case ApplicationLanguage::BritishEnglish:
+        return Service::Set::LanguageCode::EN_GB;
+    case ApplicationLanguage::Japanese:
+        return Service::Set::LanguageCode::JA;
+    case ApplicationLanguage::French:
+        return Service::Set::LanguageCode::FR;
+    case ApplicationLanguage::German:
+        return Service::Set::LanguageCode::DE;
+    case ApplicationLanguage::LatinAmericanSpanish:
+        return Service::Set::LanguageCode::ES_419;
+    case ApplicationLanguage::Spanish:
+        return Service::Set::LanguageCode::ES;
+    case ApplicationLanguage::Italian:
+        return Service::Set::LanguageCode::IT;
+    case ApplicationLanguage::Dutch:
+        return Service::Set::LanguageCode::NL;
+    case ApplicationLanguage::CanadianFrench:
+        return Service::Set::LanguageCode::FR_CA;
+    case ApplicationLanguage::Portuguese:
+        return Service::Set::LanguageCode::PT;
+    case ApplicationLanguage::Russian:
+        return Service::Set::LanguageCode::RU;
+    case ApplicationLanguage::Korean:
+        return Service::Set::LanguageCode::KO;
+    case ApplicationLanguage::TraditionalChinese:
+        return Service::Set::LanguageCode::ZH_HANT;
+    case ApplicationLanguage::SimplifiedChinese:
+        return Service::Set::LanguageCode::ZH_HANS;
+    default:
+        return std::nullopt;
+    }
+}
+} // namespace Service::NS

src/core/hle/service/ns/ns_language.h

@@ -0,0 +1,41 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+#include <optional>
+#include <string>
+#include "common/common_types.h"
+#include "core/hle/service/set/set.h"
+
+namespace Service::NS {
+    /// This is nn::ns::detail::ApplicationLanguage
+    enum class ApplicationLanguage : u8 {
+        AmericanEnglish = 0,
+        BritishEnglish,
+        Japanese,
+        French,
+        German,
+        LatinAmericanSpanish,
+        Spanish,
+        Italian,
+        Dutch,
+        CanadianFrench,
+        Portuguese,
+        Russian,
+        Korean,
+        TraditionalChinese,
+        SimplifiedChinese,
+        Count
+    };
+    using ApplicationLanguagePriorityList = const std::array<ApplicationLanguage, static_cast<std::size_t>(ApplicationLanguage::Count)>;
+
+    constexpr u32 GetSupportedLanguageFlag(const ApplicationLanguage lang) {
+        return 1u << static_cast<u32>(lang);
+    }
+
+
+    const ApplicationLanguagePriorityList* GetApplicationLanguagePriorityList(ApplicationLanguage lang);
+    std::optional<ApplicationLanguage> ConvertToApplicationLanguage(Service::Set::LanguageCode language_code);
+    std::optional<Service::Set::LanguageCode> ConvertToLanguageCode(ApplicationLanguage lang);
+}