8 files changed, 123 insertions, 106 deletions

diff --git a/src/core/file_sys/errors.h b/src/core/file_sys/errors.h
index d3e9a3829..1f3b8fa84 100644
--- a/src/core/file_sys/errors.h
+++ b/src/core/file_sys/errors.h
@@ -12,6 +12,8 @@ namespace ErrCodes {
 enum {
     NotFound = 1,
     SaveDataNotFound = 1002,
+    SdCardNotFound = 2001,
+    RomFSNotFound = 2520,
 };
 }
 
diff --git a/src/core/file_sys/filesystem.h b/src/core/file_sys/filesystem.h
index 295a3133e..1a32a373b 100644
--- a/src/core/file_sys/filesystem.h
+++ b/src/core/file_sys/filesystem.h
@@ -167,35 +167,4 @@ public:
     virtual ResultVal<EntryType> GetEntryType(const std::string& path) const = 0;
 };
 
-class FileSystemFactory : NonCopyable {
-public:
-    virtual ~FileSystemFactory() {}
-
-    /**
-     * Get a descriptive name for the archive (e.g. "RomFS", "SaveData", etc.)
-     */
-    virtual std::string GetName() const = 0;
-
-    /**
-     * Tries to open the archive of this type with the specified path
-     * @param path Path to the archive
-     * @return An ArchiveBackend corresponding operating specified archive path.
-     */
-    virtual ResultVal<std::unique_ptr<FileSystemBackend>> Open(const Path& path) = 0;
-
-    /**
-     * Deletes the archive contents and then re-creates the base folder
-     * @param path Path to the archive
-     * @return ResultCode of the operation, 0 on success
-     */
-    virtual ResultCode Format(const Path& path) = 0;
-
-    /**
-     * Retrieves the format info about the archive with the specified path
-     * @param path Path to the archive
-     * @return Format information about the archive or error code
-     */
-    virtual ResultVal<ArchiveFormatInfo> GetFormatInfo(const Path& path) const = 0;
-};
-
 } // namespace FileSys
diff --git a/src/core/file_sys/romfs_factory.cpp b/src/core/file_sys/romfs_factory.cpp
index 84ae0d99b..946fc0452 100644
--- a/src/core/file_sys/romfs_factory.cpp
+++ b/src/core/file_sys/romfs_factory.cpp
@@ -11,28 +11,17 @@
 
 namespace FileSys {
 
-RomFS_Factory::RomFS_Factory(Loader::AppLoader& app_loader) {
+RomFSFactory::RomFSFactory(Loader::AppLoader& app_loader) {
     // Load the RomFS from the app
     if (Loader::ResultStatus::Success != app_loader.ReadRomFS(romfs_file, data_offset, data_size)) {
         LOG_ERROR(Service_FS, "Unable to read RomFS!");
     }
 }
 
-ResultVal<std::unique_ptr<FileSystemBackend>> RomFS_Factory::Open(const Path& path) {
+ResultVal<std::unique_ptr<FileSystemBackend>> RomFSFactory::Open(u64 title_id) {
+    // TODO(DarkLordZach): Use title id.
     auto archive = std::make_unique<RomFS_FileSystem>(romfs_file, data_offset, data_size);
     return MakeResult<std::unique_ptr<FileSystemBackend>>(std::move(archive));
 }
 
-ResultCode RomFS_Factory::Format(const Path& path) {
-    LOG_ERROR(Service_FS, "Unimplemented Format archive {}", GetName());
-    // TODO(bunnei): Find the right error code for this
-    return ResultCode(-1);
-}
-
-ResultVal<ArchiveFormatInfo> RomFS_Factory::GetFormatInfo(const Path& path) const {
-    LOG_ERROR(Service_FS, "Unimplemented GetFormatInfo archive {}", GetName());
-    // TODO(bunnei): Find the right error code for this
-    return ResultCode(-1);
-}
-
 } // namespace FileSys
diff --git a/src/core/file_sys/romfs_factory.h b/src/core/file_sys/romfs_factory.h
index e0698e642..c9e20c3ab 100644
--- a/src/core/file_sys/romfs_factory.h
+++ b/src/core/file_sys/romfs_factory.h
@@ -15,16 +15,11 @@
 namespace FileSys {
 
 /// File system interface to the RomFS archive
-class RomFS_Factory final : public FileSystemFactory {
+class RomFSFactory {
 public:
-    explicit RomFS_Factory(Loader::AppLoader& app_loader);
+    explicit RomFSFactory(Loader::AppLoader& app_loader);
 
-    std::string GetName() const override {
-        return "ArchiveFactory_RomFS";
-    }
-    ResultVal<std::unique_ptr<FileSystemBackend>> Open(const Path& path) override;
-    ResultCode Format(const Path& path) override;
-    ResultVal<ArchiveFormatInfo> GetFormatInfo(const Path& path) const override;
+    ResultVal<std::unique_ptr<FileSystemBackend>> Open(u64 title_id);
 
 private:
     std::shared_ptr<FileUtil::IOFile> romfs_file;
diff --git a/src/core/file_sys/savedata_factory.cpp b/src/core/file_sys/savedata_factory.cpp
index f3aa213af..3ad37b28c 100644
--- a/src/core/file_sys/savedata_factory.cpp
+++ b/src/core/file_sys/savedata_factory.cpp
@@ -12,11 +12,49 @@
 
 namespace FileSys {
 
-SaveData_Factory::SaveData_Factory(std::string nand_directory)
+std::string SaveDataDescriptor::DebugInfo() {
+    return fmt::format("[type={:02X}, title_id={:016X}, user_id={:016X}{:016X}, save_id={:016X}]",
+                       static_cast<u8>(type), title_id, user_id[1], user_id[0], save_id);
+}
+
+SaveDataFactory::SaveDataFactory(std::string nand_directory)
     : nand_directory(std::move(nand_directory)) {}
 
-ResultVal<std::unique_ptr<FileSystemBackend>> SaveData_Factory::Open(const Path& path) {
-    std::string save_directory = GetFullPath();
+ResultVal<std::unique_ptr<FileSystemBackend>> SaveDataFactory::Open(SaveDataSpaceId space,
+                                                                    SaveDataDescriptor meta) {
+    if (meta.type == SaveDataType::SystemSaveData || meta.type == SaveDataType::SaveData) {
+        if (meta.zero_1 != 0) {
+            LOG_WARNING(Service_FS,
+                        "Possibly incorrect SaveDataDescriptor, type is "
+                        "SystemSaveData||SaveData but offset 0x28 is non-zero ({:016X}).",
+                        meta.zero_1);
+        }
+        if (meta.zero_2 != 0) {
+            LOG_WARNING(Service_FS,
+                        "Possibly incorrect SaveDataDescriptor, type is "
+                        "SystemSaveData||SaveData but offset 0x30 is non-zero ({:016X}).",
+                        meta.zero_2);
+        }
+        if (meta.zero_3 != 0) {
+            LOG_WARNING(Service_FS,
+                        "Possibly incorrect SaveDataDescriptor, type is "
+                        "SystemSaveData||SaveData but offset 0x38 is non-zero ({:016X}).",
+                        meta.zero_3);
+        }
+    }
+
+    if (meta.type == SaveDataType::SystemSaveData && meta.title_id != 0) {
+        LOG_WARNING(Service_FS,
+                    "Possibly incorrect SaveDataDescriptor, type is SystemSaveData but title_id is "
+                    "non-zero ({:016X}).",
+                    meta.title_id);
+    }
+
+    std::string save_directory =
+        GetFullPath(space, meta.type, meta.title_id, meta.user_id, meta.save_id);
+
+    // TODO(DarkLordZach): Try to not create when opening, there are dedicated create save methods.
+    // But, user_ids don't match so this works for now.
 
     if (!FileUtil::Exists(save_directory)) {
         // TODO(bunnei): This is a work-around to always create a save data directory if it does not
@@ -26,6 +64,12 @@ ResultVal<std::unique_ptr<FileSystemBackend>> SaveData_Factory::Open(const Path&
         FileUtil::CreateFullPath(save_directory);
     }
 
+    // TODO(DarkLordZach): For some reason, CreateFullPath doesn't create the last bit. Should be
+    // fixed with VFS.
+    if (!FileUtil::IsDirectory(save_directory)) {
+        FileUtil::CreateDir(save_directory);
+    }
+
     // Return an error if the save data doesn't actually exist.
     if (!FileUtil::IsDirectory(save_directory)) {
         // TODO(Subv): Find out correct error code.
@@ -36,28 +80,35 @@ ResultVal<std::unique_ptr<FileSystemBackend>> SaveData_Factory::Open(const Path&
     return MakeResult<std::unique_ptr<FileSystemBackend>>(std::move(archive));
 }
 
-ResultCode SaveData_Factory::Format(const Path& path) {
-    LOG_WARNING(Service_FS, "Format archive {}", GetName());
-    // Create the save data directory.
-    if (!FileUtil::CreateFullPath(GetFullPath())) {
-        // TODO(Subv): Find the correct error code.
-        return ResultCode(-1);
-    }
+std::string SaveDataFactory::GetFullPath(SaveDataSpaceId space, SaveDataType type, u64 title_id,
+                                         u128 user_id, u64 save_id) const {
+    // According to switchbrew, if a save is of type SaveData and the title id field is 0, it should
+    // be interpreted as the title id of the current process.
+    if (type == SaveDataType::SaveData && title_id == 0)
+        title_id = Core::CurrentProcess()->program_id;
 
-    return RESULT_SUCCESS;
-}
+    std::string prefix;
 
-ResultVal<ArchiveFormatInfo> SaveData_Factory::GetFormatInfo(const Path& path) const {
-    LOG_ERROR(Service_FS, "Unimplemented GetFormatInfo archive {}", GetName());
-    // TODO(bunnei): Find the right error code for this
-    return ResultCode(-1);
-}
+    switch (space) {
+    case SaveDataSpaceId::NandSystem:
+        prefix = nand_directory + "system/save/";
+        break;
+    case SaveDataSpaceId::NandUser:
+        prefix = nand_directory + "user/save/";
+        break;
+    default:
+        ASSERT_MSG(false, "Unrecognized SaveDataSpaceId: {:02X}", static_cast<u8>(space));
+    }
 
-std::string SaveData_Factory::GetFullPath() const {
-    u64 title_id = Core::CurrentProcess()->program_id;
-    // TODO(Subv): Somehow obtain this value.
-    u32 user = 0;
-    return fmt::format("{}save/{:016X}/{:08X}/", nand_directory, title_id, user);
+    switch (type) {
+    case SaveDataType::SystemSaveData:
+        return fmt::format("{}{:016X}/{:016X}{:016X}", prefix, save_id, user_id[1], user_id[0]);
+    case SaveDataType::SaveData:
+        return fmt::format("{}{:016X}/{:016X}{:016X}/{:016X}", prefix, 0, user_id[1], user_id[0],
+                           title_id);
+    default:
+        ASSERT_MSG(false, "Unrecognized SaveDataType: {:02X}", static_cast<u8>(type));
+    }
 }
 
 } // namespace FileSys
diff --git a/src/core/file_sys/savedata_factory.h b/src/core/file_sys/savedata_factory.h
index 73a42aab6..b96721ac0 100644
--- a/src/core/file_sys/savedata_factory.h
+++ b/src/core/file_sys/savedata_factory.h
@@ -12,22 +12,50 @@
 
 namespace FileSys {
 
+enum class SaveDataSpaceId : u8 {
+    NandSystem = 0,
+    NandUser = 1,
+    SdCard = 2,
+    TemporaryStorage = 3,
+};
+
+enum class SaveDataType : u8 {
+    SystemSaveData = 0,
+    SaveData = 1,
+    BcatDeliveryCacheStorage = 2,
+    DeviceSaveData = 3,
+    TemporaryStorage = 4,
+    CacheStorage = 5,
+};
+
+struct SaveDataDescriptor {
+    u64_le title_id;
+    u128 user_id;
+    u64_le save_id;
+    SaveDataType type;
+    INSERT_PADDING_BYTES(7);
+    u64_le zero_1;
+    u64_le zero_2;
+    u64_le zero_3;
+
+    std::string DebugInfo();
+};
+static_assert(sizeof(SaveDataDescriptor) == 0x40, "SaveDataDescriptor has incorrect size.");
+
 /// File system interface to the SaveData archive
-class SaveData_Factory final : public FileSystemFactory {
+class SaveDataFactory {
 public:
-    explicit SaveData_Factory(std::string nand_directory);
+    explicit SaveDataFactory(std::string nand_directory);
 
-    std::string GetName() const override {
-        return "SaveData_Factory";
-    }
-    ResultVal<std::unique_ptr<FileSystemBackend>> Open(const Path& path) override;
-    ResultCode Format(const Path& path) override;
-    ResultVal<ArchiveFormatInfo> GetFormatInfo(const Path& path) const override;
+    ResultVal<std::unique_ptr<FileSystemBackend>> Open(SaveDataSpaceId space,
+                                                       SaveDataDescriptor meta);
 
 private:
     std::string nand_directory;
+    std::string sd_directory;
 
-    std::string GetFullPath() const;
+    std::string GetFullPath(SaveDataSpaceId space, SaveDataType type, u64 title_id, u128 user_id,
+                            u64 save_id) const;
 };
 
 } // namespace FileSys
diff --git a/src/core/file_sys/sdmc_factory.cpp b/src/core/file_sys/sdmc_factory.cpp
index 2e5ffb764..ac6f2f971 100644
--- a/src/core/file_sys/sdmc_factory.cpp
+++ b/src/core/file_sys/sdmc_factory.cpp
@@ -12,9 +12,9 @@
 
 namespace FileSys {
 
-SDMC_Factory::SDMC_Factory(std::string sd_directory) : sd_directory(std::move(sd_directory)) {}
+SDMCFactory::SDMCFactory(std::string sd_directory) : sd_directory(std::move(sd_directory)) {}
 
-ResultVal<std::unique_ptr<FileSystemBackend>> SDMC_Factory::Open(const Path& path) {
+ResultVal<std::unique_ptr<FileSystemBackend>> SDMCFactory::Open() {
     // Create the SD Card directory if it doesn't already exist.
     if (!FileUtil::IsDirectory(sd_directory)) {
         FileUtil::CreateFullPath(sd_directory);
@@ -24,16 +24,4 @@ ResultVal<std::unique_ptr<FileSystemBackend>> SDMC_Factory::Open(const Path& pat
     return MakeResult<std::unique_ptr<FileSystemBackend>>(std::move(archive));
 }
 
-ResultCode SDMC_Factory::Format(const Path& path) {
-    LOG_ERROR(Service_FS, "Unimplemented Format archive {}", GetName());
-    // TODO(Subv): Find the right error code for this
-    return ResultCode(-1);
-}
-
-ResultVal<ArchiveFormatInfo> SDMC_Factory::GetFormatInfo(const Path& path) const {
-    LOG_ERROR(Service_FS, "Unimplemented GetFormatInfo archive {}", GetName());
-    // TODO(bunnei): Find the right error code for this
-    return ResultCode(-1);
-}
-
 } // namespace FileSys
diff --git a/src/core/file_sys/sdmc_factory.h b/src/core/file_sys/sdmc_factory.h
index 93becda25..09bec7fce 100644
--- a/src/core/file_sys/sdmc_factory.h
+++ b/src/core/file_sys/sdmc_factory.h
@@ -13,16 +13,11 @@
 namespace FileSys {
 
 /// File system interface to the SDCard archive
-class SDMC_Factory final : public FileSystemFactory {
+class SDMCFactory {
 public:
-    explicit SDMC_Factory(std::string sd_directory);
+    explicit SDMCFactory(std::string sd_directory);
 
-    std::string GetName() const override {
-        return "SDMC_Factory";
-    }
-    ResultVal<std::unique_ptr<FileSystemBackend>> Open(const Path& path) override;
-    ResultCode Format(const Path& path) override;
-    ResultVal<ArchiveFormatInfo> GetFormatInfo(const Path& path) const override;
+    ResultVal<std::unique_ptr<FileSystemBackend>> Open();
 
 private:
     std::string sd_directory;