Implement language support for rom loaders

app/src/main/cpp/loader_jni.cpp

@@ -11,7 +11,7 @@
 #include "skyline/loader/nsp.h"
 #include "skyline/jvm.h"
 
-extern "C" JNIEXPORT jint JNICALL Java_emu_skyline_loader_RomFile_populate(JNIEnv *env, jobject thiz, jint jformat, jint fd, jstring appFilesPathJstring) {
+extern "C" JNIEXPORT jint JNICALL Java_emu_skyline_loader_RomFile_populate(JNIEnv *env, jobject thiz, jint jformat, jint fd, jstring appFilesPathJstring, jint systemLanguage) {
     skyline::loader::RomFormat format{static_cast<skyline::loader::RomFormat>(jformat)};
 
     auto appFilesPath{env->GetStringUTFChars(appFilesPathJstring, nullptr)};
@@ -53,8 +53,12 @@ extern "C" JNIEXPORT jint JNICALL Java_emu_skyline_loader_RomFile_populate(JNIEn
     jfieldID rawIconField{env->GetFieldID(clazz, "rawIcon", "[B")};
 
     if (loader->nacp) {
-        env->SetObjectField(thiz, applicationNameField, env->NewStringUTF(loader->nacp->applicationName.c_str()));
+        auto language{skyline::languages::GetApplicationLanguage(static_cast<skyline::languages::SystemLanguage>(systemLanguage))};
-        env->SetObjectField(thiz, applicationAuthorField, env->NewStringUTF(loader->nacp->applicationPublisher.c_str()));
+        if ((1 << static_cast<skyline::u32>(language) & loader->nacp->supportedTitleLanguages) == 0)
+            language = loader->nacp->GetFirstSupportedTitleLanguage();
+
+        env->SetObjectField(thiz, applicationNameField, env->NewStringUTF(loader->nacp->GetApplicationName(language).c_str()));
+        env->SetObjectField(thiz, applicationAuthorField, env->NewStringUTF(loader->nacp->GetApplicationPublisher(language).c_str()));
 
         auto icon{loader->GetIcon()};
         jbyteArray iconByteArray{env->NewByteArray(icon.size())};

app/src/main/cpp/skyline/common/languages.h

@@ -3,6 +3,7 @@
 
 #pragma once
 
+#include <frozen/unordered_map.h>
 #include <common.h>
 
 namespace skyline {
@@ -14,6 +15,45 @@ namespace skyline {
     }
 
     namespace languages {
+        enum class SystemLanguage : u32 {
+            Japanese = 0,
+            AmericanEnglish,
+            French,
+            German,
+            Italian,
+            Spanish,
+            Chinese,
+            Korean,
+            Dutch,
+            Portuguese,
+            Russian,
+            Taiwanese,
+            BritishEnglish,
+            CanadianFrench,
+            LatinAmericanSpanish,
+            SimplifiedChinese,
+            TraditionalChinese,
+            BrazilianPortuguese,
+        };
+
+        enum class ApplicationLanguage : u32 {
+            AmericanEnglish = 0,
+            BritishEnglish,
+            Japanese,
+            French,
+            German,
+            LatinAmericanSpanish,
+            Spanish,
+            Italian,
+            Dutch,
+            CanadianFrench,
+            Portuguese,
+            Russian,
+            Korean,
+            TraditionalChinese,
+            SimplifiedChinese,
+        };
+
         constexpr std::array<LanguageCode, constant::NewLanguageCodeListSize> LanguageCodeList{
             util::MakeMagic<LanguageCode>("ja"),
             util::MakeMagic<LanguageCode>("en-US"),
@@ -38,5 +78,58 @@ namespace skyline {
         constexpr LanguageCode GetLanguageCode(SystemLanguage language) {
             return LanguageCodeList.at(static_cast<size_t>(language));
         }
+
+        #define LANG_MAP_ENTRY(lang) {SystemLanguage::lang, ApplicationLanguage::lang}
+        #define LANG_MAP_ENTRY_CST(sysLang, appLang) {SystemLanguage::sysLang, ApplicationLanguage::appLang}
+        constexpr frz::unordered_map<SystemLanguage, ApplicationLanguage, constant::NewLanguageCodeListSize> SystemToAppMap{
+            LANG_MAP_ENTRY(Japanese),
+            LANG_MAP_ENTRY(AmericanEnglish),
+            LANG_MAP_ENTRY(French),
+            LANG_MAP_ENTRY(German),
+            LANG_MAP_ENTRY(Italian),
+            LANG_MAP_ENTRY(Spanish),
+            LANG_MAP_ENTRY_CST(Chinese, SimplifiedChinese),
+            LANG_MAP_ENTRY(Korean),
+            LANG_MAP_ENTRY(Dutch),
+            LANG_MAP_ENTRY(Portuguese),
+            LANG_MAP_ENTRY(Russian),
+            LANG_MAP_ENTRY_CST(Taiwanese, TraditionalChinese),
+            LANG_MAP_ENTRY(BritishEnglish),
+            LANG_MAP_ENTRY(CanadianFrench),
+            LANG_MAP_ENTRY(LatinAmericanSpanish),
+            LANG_MAP_ENTRY(SimplifiedChinese),
+            LANG_MAP_ENTRY(TraditionalChinese),
+            LANG_MAP_ENTRY_CST(BrazilianPortuguese, Portuguese),
+        };
+        #undef LANG_MAP_ENTRY
+        #undef LANG_MAP_ENTRY_CST
+
+        constexpr ApplicationLanguage GetApplicationLanguage(SystemLanguage systemLanguage) {
+            return SystemToAppMap.at(systemLanguage);
+        }
+
+        #define LANG_MAP_ENTRY_REVERSE(lang) {ApplicationLanguage::lang, SystemLanguage::lang}
+        constexpr frz::unordered_map<ApplicationLanguage, SystemLanguage, constant::OldLanguageCodeListSize> AppToSystemMap{
+            LANG_MAP_ENTRY_REVERSE(Japanese),
+            LANG_MAP_ENTRY_REVERSE(AmericanEnglish),
+            LANG_MAP_ENTRY_REVERSE(French),
+            LANG_MAP_ENTRY_REVERSE(German),
+            LANG_MAP_ENTRY_REVERSE(Italian),
+            LANG_MAP_ENTRY_REVERSE(Spanish),
+            LANG_MAP_ENTRY_REVERSE(Korean),
+            LANG_MAP_ENTRY_REVERSE(Dutch),
+            LANG_MAP_ENTRY_REVERSE(Portuguese),
+            LANG_MAP_ENTRY_REVERSE(Russian),
+            LANG_MAP_ENTRY_REVERSE(BritishEnglish),
+            LANG_MAP_ENTRY_REVERSE(CanadianFrench),
+            LANG_MAP_ENTRY_REVERSE(LatinAmericanSpanish),
+            LANG_MAP_ENTRY_REVERSE(SimplifiedChinese),
+            LANG_MAP_ENTRY_REVERSE(TraditionalChinese),
+        };
+        #undef LANG_MAP_ENTRY_REVERSE
+
+        constexpr SystemLanguage GetSystemLanguage(ApplicationLanguage applicationLanguage) {
+            return AppToSystemMap.at(applicationLanguage);
+        }
     }
 }

app/src/main/cpp/skyline/loader/nro.cpp

@@ -64,7 +64,8 @@ namespace skyline::loader {
         }
 
         state.process->memory.InitializeVmm(memory::AddressSpaceType::AddressSpace39Bit);
-        auto loadInfo{LoadExecutable(process, state, executable, 0, nacp->applicationName.empty() ? "main.nro" : nacp->applicationName + ".nro")};
+        auto applicationName{nacp->GetApplicationName(nacp->GetFirstSupportedTitleLanguage())};
+        auto loadInfo{LoadExecutable(process, state, executable, 0, applicationName.empty() ? "main.nro" : applicationName + ".nro")};
         state.process->memory.InitializeRegions(loadInfo.base, loadInfo.size);
 
         return loadInfo.entry;

app/src/main/cpp/skyline/vfs/nacp.cpp

@@ -1,21 +1,33 @@
 // SPDX-License-Identifier: MPL-2.0
 // Copyright © 2020 Skyline Team and Contributors (https://github.com/skyline-emu/)
 
+#include <bit>
 #include "nacp.h"
 
 namespace skyline::vfs {
     NACP::NACP(const std::shared_ptr<vfs::Backing> &backing) {
         nacpContents = backing->Read<NacpData>();
 
-        // TODO: Select based on language settings, complete struct, yada yada
+        u32 counter{0};
-
-        // Iterate till we get to the first populated entry
         for (auto &entry : nacpContents.titleEntries) {
-            if (entry.applicationName.front() == '\0')
+            if (entry.applicationName.front() != '\0') {
-                continue;
+                supportedTitleLanguages |= (1 << counter);
-
-            applicationName = span(entry.applicationName).as_string(true);
-            applicationPublisher = span(entry.applicationPublisher).as_string(true);
             }
+            counter++;
+        }
+    }
+
+    languages::ApplicationLanguage NACP::GetFirstSupportedTitleLanguage() {
+        return static_cast<languages::ApplicationLanguage>(std::countr_zero(supportedTitleLanguages));
+    }
+
+    std::string NACP::GetApplicationName(languages::ApplicationLanguage language) {
+        auto applicationName{span(nacpContents.titleEntries.at(static_cast<size_t>(language)).applicationName)};
+        return std::string(applicationName.as_string(true));
+    }
+
+    std::string NACP::GetApplicationPublisher(languages::ApplicationLanguage language) {
+        auto applicationPublisher{span(nacpContents.titleEntries.at(static_cast<size_t>(language)).applicationPublisher)};
+        return std::string(applicationPublisher.as_string(true));
     }
 }

app/src/main/cpp/skyline/vfs/nacp.h

@@ -3,6 +3,7 @@
 
 #pragma once
 
+#include <common/languages.h>
 #include "backing.h"
 
 namespace skyline::vfs {
@@ -24,17 +25,24 @@ namespace skyline::vfs {
       public:
         struct NacpData {
             std::array<ApplicationTitle, 0x10> titleEntries; //!< Title entries for each language
-            u8 _pad0_[0x78];
+            u8 _pad0_[0x2C];
-            u64 saveDataOwnerId; //!< The ID that should be used for this application's savedata
+            u32 supportedLanguageFlag; //!< A bitmask containing the game's supported languages
             u8 _pad1_[0x78];
+            u64 saveDataOwnerId; //!< The ID that should be used for this application's savedata
+            u8 _pad2_[0x48];
             std::array<u8, 8> seedForPseudoDeviceId; //!< Seed that is combined with the device seed for generating the pseudo-device ID
-            u8 _pad2_[0xF00];
+            u8 _pad3_[0xF00];
         } nacpContents{};
         static_assert(sizeof(NacpData) == 0x4000);
 
         NACP(const std::shared_ptr<vfs::Backing> &backing);
 
-        std::string applicationName; //!< The name of the application in the currently selected language
+        languages::ApplicationLanguage GetFirstSupportedTitleLanguage();
-        std::string applicationPublisher; //!< The publisher of the application in the currently selected language
+
+        std::string GetApplicationName(languages::ApplicationLanguage language);
+
+        std::string GetApplicationPublisher(languages::ApplicationLanguage language);
+
+        u32 supportedTitleLanguages{0};
     };
 }

app/src/main/java/emu/skyline/MainActivity.kt

@@ -292,7 +292,7 @@ class MainActivity : AppCompatActivity() {
     }
 
     private fun loadRoms(loadFromFile : Boolean) {
-        viewModel.loadRoms(loadFromFile, Uri.parse(settings.searchLocation))
+        viewModel.loadRoms(loadFromFile, Uri.parse(settings.searchLocation), Integer.parseInt(settings.systemLanguage))
         settings.refreshRequired = false
     }
 

app/src/main/java/emu/skyline/MainViewModel.kt

@@ -43,7 +43,7 @@ class MainViewModel @Inject constructor(@ApplicationContext context : Context, p
      *
      * @param loadFromFile If this is false then trying to load cached adapter data is skipped entirely
      */
-    fun loadRoms(loadFromFile : Boolean, searchLocation : Uri) {
+    fun loadRoms(loadFromFile : Boolean, searchLocation : Uri, systemLanguage : Int) {
         if (state == MainState.Loading) return
         state = MainState.Loading
 
@@ -64,7 +64,7 @@ class MainViewModel @Inject constructor(@ApplicationContext context : Context, p
                 MainState.Loaded(HashMap())
             } else {
                 try {
-                    val romElements = romProvider.loadRoms(searchLocation)
+                    val romElements = romProvider.loadRoms(searchLocation, systemLanguage)
                     romElements.toFile(romsFile)
                     MainState.Loaded(romElements)
                 } catch (e : Exception) {

app/src/main/java/emu/skyline/RomProvider.kt

@@ -18,21 +18,21 @@ class RomProvider @Inject constructor(@ApplicationContext private val context :
      * This adds all files in [directory] with [extension] as an entry using [RomFile] to load metadata
      */
     @SuppressLint("DefaultLocale")
-    private fun addEntries(fileFormats : Map<String, RomFormat>, directory : DocumentFile, entries : HashMap<RomFormat, ArrayList<AppEntry>>) {
+    private fun addEntries(fileFormats : Map<String, RomFormat>, directory : DocumentFile, entries : HashMap<RomFormat, ArrayList<AppEntry>>, systemLanguage : Int) {
         directory.listFiles().forEach { file ->
             if (file.isDirectory) {
-                addEntries(fileFormats, file, entries)
+                addEntries(fileFormats, file, entries, systemLanguage)
             } else {
                 fileFormats[file.name?.substringAfterLast(".")?.toLowerCase()]?.let { romFormat->
-                    entries.getOrPut(romFormat, { arrayListOf() }).add(RomFile(context, romFormat, file.uri).appEntry)
+                    entries.getOrPut(romFormat, { arrayListOf() }).add(RomFile(context, romFormat, file.uri, systemLanguage).appEntry)
                 }
             }
         }
     }
 
-    fun loadRoms(searchLocation : Uri) = DocumentFile.fromTreeUri(context, searchLocation)!!.let { documentFile ->
+    fun loadRoms(searchLocation : Uri, systemLanguage : Int) = DocumentFile.fromTreeUri(context, searchLocation)!!.let { documentFile ->
         hashMapOf<RomFormat, ArrayList<AppEntry>>().apply {
-            addEntries(mapOf("nro" to NRO, "nso" to NSO, "nca" to NCA, "nsp" to NSP, "xci" to XCI), documentFile, this)
+            addEntries(mapOf("nro" to NRO, "nso" to NSO, "nca" to NCA, "nsp" to NSP, "xci" to XCI), documentFile, this, systemLanguage)
         }
     }
 }

app/src/main/java/emu/skyline/loader/RomFile.kt

@@ -103,7 +103,7 @@ data class AppEntry(var name : String, var author : String?, var icon : Bitmap?,
 /**
  * This class is used as interface between libskyline and Kotlin for loaders
  */
-internal class RomFile(context : Context, format : RomFormat, uri : Uri) {
+internal class RomFile(context : Context, format : RomFormat, uri : Uri, systemLanguage : Int) {
     /**
      * @note This field is filled in by native code
      */
@@ -130,7 +130,7 @@ internal class RomFile(context : Context, format : RomFormat, uri : Uri) {
         System.loadLibrary("skyline")
 
         context.contentResolver.openFileDescriptor(uri, "r")!!.use {
-            result = LoaderResult.get(populate(format.ordinal, it.fd, context.filesDir.canonicalPath + "/"))
+            result = LoaderResult.get(populate(format.ordinal, it.fd, context.filesDir.canonicalPath + "/", systemLanguage))
         }
 
         appEntry = applicationName?.let { name ->
@@ -149,5 +149,5 @@ internal class RomFile(context : Context, format : RomFormat, uri : Uri) {
      * @param appFilesPath Path to internal app data storage, needed to read imported keys
      * @return A pointer to the newly allocated object, or 0 if the ROM is invalid
      */
-    private external fun populate(format : Int, romFd : Int, appFilesPath : String) : Int
+    private external fun populate(format : Int, romFd : Int, appFilesPath : String, systemLanguage : Int) : Int
 }