file_sys: Add support for the BOSS ext save data archive. (#7231)

src/core/file_sys/archive_backend.h

@@ -41,6 +41,7 @@ class Path {
 public:
     Path() : type(LowPathType::Invalid) {}
     Path(const char* path) : type(LowPathType::Char), string(path) {}
+    Path(std::string path) : type(LowPathType::Char), string(std::move(path)) {}
     Path(std::vector<u8> binary_data) : type(LowPathType::Binary), binary(std::move(binary_data)) {}
     template <std::size_t size>
     Path(const std::array<u8, size>& binary_data)

src/core/file_sys/archive_extsavedata.cpp

@@ -216,14 +216,16 @@ Path ConstructExtDataBinaryPath(u32 media_type, u32 high, u32 low) {
 }
 
 ArchiveFactory_ExtSaveData::ArchiveFactory_ExtSaveData(const std::string& mount_location,
-                                                       bool shared)
-    : shared(shared), mount_point(GetExtDataContainerPath(mount_location, shared)) {
+                                                       ExtSaveDataType type_)
+    : type(type_),
+      mount_point(GetExtDataContainerPath(mount_location, type_ == ExtSaveDataType::Shared)) {
     LOG_DEBUG(Service_FS, "Directory {} set as base for ExtSaveData.", mount_point);
 }
 
 Path ArchiveFactory_ExtSaveData::GetCorrectedPath(const Path& path) {
-    if (!shared)
+    if (type != ExtSaveDataType::Shared) {
         return path;
+    }
 
     static constexpr u32 SharedExtDataHigh = 0x48000;
 
@@ -242,11 +244,12 @@ Path ArchiveFactory_ExtSaveData::GetCorrectedPath(const Path& path) {
 
 ResultVal<std::unique_ptr<ArchiveBackend>> ArchiveFactory_ExtSaveData::Open(const Path& path,
                                                                             u64 program_id) {
-    std::string fullpath = GetExtSaveDataPath(mount_point, GetCorrectedPath(path)) + "user/";
+    const auto directory = type == ExtSaveDataType::Boss ? "boss/" : "user/";
+    const auto fullpath = GetExtSaveDataPath(mount_point, GetCorrectedPath(path)) + directory;
     if (!FileUtil::Exists(fullpath)) {
         // TODO(Subv): Verify the archive behavior of SharedExtSaveData compared to ExtSaveData.
         // ExtSaveData seems to return FS_NotFound (120) when the archive doesn't exist.
-        if (!shared) {
+        if (type != ExtSaveDataType::Shared) {
             return ERR_NOT_FOUND_INVALID_STATE;
         } else {
             return ERR_NOT_FORMATTED;

src/core/file_sys/archive_extsavedata.h

@@ -15,10 +15,16 @@
 
 namespace FileSys {
 
+enum class ExtSaveDataType {
+    Normal, ///< Regular non-shared ext save data
+    Shared, ///< Shared ext save data
+    Boss,   ///< SpotPass ext save data
+};
+
 /// File system interface to the ExtSaveData archive
 class ArchiveFactory_ExtSaveData final : public ArchiveFactory {
 public:
-    ArchiveFactory_ExtSaveData(const std::string& mount_point, bool shared);
+    ArchiveFactory_ExtSaveData(const std::string& mount_point, ExtSaveDataType type_);
 
     std::string GetName() const override {
         return "ExtSaveData";
@@ -42,8 +48,8 @@ public:
     void WriteIcon(const Path& path, std::span<const u8> icon);
 
 private:
-    bool shared; ///< Whether this archive represents an ExtSaveData archive or a SharedExtSaveData
-                 /// archive
+    /// Type of ext save data archive being accessed.
+    ExtSaveDataType type;
 
     /**
      * This holds the full directory path for this archive, it is only set after a successful call
@@ -59,7 +65,7 @@ private:
     template <class Archive>
     void serialize(Archive& ar, const unsigned int) {
         ar& boost::serialization::base_object<ArchiveFactory>(*this);
-        ar& shared;
+        ar& type;
         ar& mount_point;
     }
     friend class boost::serialization::access;