Merge pull request #540 from yuriks/multi-archives

FS: Allow multiple instances of the same archive type to be open at once

src/core/file_sys/archive_backend.h

@@ -180,20 +180,6 @@ public:
     virtual ~ArchiveBackend() {
     }
 
-    /**
-     * Tries to open the archive of this type with the specified path
-     * @param path Path to the archive
-     * @return ResultCode of the operation
-     */
-    virtual ResultCode 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) const = 0;
-
     /**
      * Get a descriptive name for the archive (e.g. "RomFS", "SaveData", etc.)
      */
@@ -260,4 +246,29 @@ public:
     virtual std::unique_ptr<DirectoryBackend> OpenDirectory(const Path& path) const = 0;
 };
 
+class ArchiveFactory : NonCopyable {
+public:
+    virtual ~ArchiveFactory() {
+    }
+
+    /**
+     * 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<ArchiveBackend>> 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;
+};
+
 } // namespace FileSys

src/core/file_sys/archive_extsavedata.cpp

@@ -6,6 +6,7 @@
 
 #include "common/common_types.h"
 #include "common/file_util.h"
+#include "common/make_unique.h"
 
 #include "core/file_sys/archive_extsavedata.h"
 #include "core/file_sys/disk_archive.h"
@@ -33,12 +34,12 @@ std::string GetExtDataContainerPath(const std::string& mount_point, bool shared)
             SYSTEM_ID.c_str(), SDCARD_ID.c_str());
 }
 
-Archive_ExtSaveData::Archive_ExtSaveData(const std::string& mount_location, bool shared)
-        : DiskArchive(GetExtDataContainerPath(mount_location, shared)) {
+ArchiveFactory_ExtSaveData::ArchiveFactory_ExtSaveData(const std::string& mount_location, bool shared)
+        : mount_point(GetExtDataContainerPath(mount_location, shared)) {
     LOG_INFO(Service_FS, "Directory %s set as base for ExtSaveData.", mount_point.c_str());
 }
 
-bool Archive_ExtSaveData::Initialize() {
+bool ArchiveFactory_ExtSaveData::Initialize() {
     if (!FileUtil::CreateFullPath(mount_point)) {
         LOG_ERROR(Service_FS, "Unable to create ExtSaveData base path.");
         return false;
@@ -47,18 +48,18 @@ bool Archive_ExtSaveData::Initialize() {
     return true;
 }
 
-ResultCode Archive_ExtSaveData::Open(const Path& path) {
+ResultVal<std::unique_ptr<ArchiveBackend>> ArchiveFactory_ExtSaveData::Open(const Path& path) {
     std::string fullpath = GetExtSaveDataPath(mount_point, path);
     if (!FileUtil::Exists(fullpath)) {
         // TODO(Subv): Check error code, this one is probably wrong
         return ResultCode(ErrorDescription::FS_NotFormatted, ErrorModule::FS,
             ErrorSummary::InvalidState, ErrorLevel::Status);
     }
-    concrete_mount_point = fullpath;
-    return RESULT_SUCCESS;
+    auto archive = Common::make_unique<DiskArchive>(fullpath);
+    return MakeResult<std::unique_ptr<ArchiveBackend>>(std::move(archive));
 }
 
-ResultCode Archive_ExtSaveData::Format(const Path& path) const {
+ResultCode ArchiveFactory_ExtSaveData::Format(const Path& path) {
     std::string fullpath = GetExtSaveDataPath(mount_point, path);
     FileUtil::CreateFullPath(fullpath);
     return RESULT_SUCCESS;

src/core/file_sys/archive_extsavedata.h

@@ -15,9 +15,9 @@
 namespace FileSys {
 
 /// File system interface to the ExtSaveData archive
-class Archive_ExtSaveData final : public DiskArchive {
+class ArchiveFactory_ExtSaveData final : public ArchiveFactory {
 public:
-    Archive_ExtSaveData(const std::string& mount_point, bool shared);
+    ArchiveFactory_ExtSaveData(const std::string& mount_point, bool shared);
 
     /**
      * Initialize the archive.
@@ -25,21 +25,20 @@ public:
      */
     bool Initialize();
 
-    ResultCode Open(const Path& path) override;
-    ResultCode Format(const Path& path) const override;
     std::string GetName() const override { return "ExtSaveData"; }
 
-    const std::string& GetMountPoint() const override {
-        return concrete_mount_point;
-    }
+    ResultVal<std::unique_ptr<ArchiveBackend>> Open(const Path& path) override;
+    ResultCode Format(const Path& path) override;
 
-protected:
+    const std::string& GetMountPoint() const { return mount_point; }
+
+private:
     /**
-     * This holds the full directory path for this archive, it is only set after a successful call to Open, 
-     * this is formed as <base extsavedatapath>/<type>/<high>/<low>. 
+     * This holds the full directory path for this archive, it is only set after a successful call
+     * to Open, this is formed as <base extsavedatapath>/<type>/<high>/<low>. 
      * See GetExtSaveDataPath for the code that extracts this data from an archive path.
      */
-    std::string concrete_mount_point;
+    std::string mount_point;
 };
 
 /**

src/core/file_sys/archive_romfs.cpp

@@ -15,11 +15,24 @@
 
 namespace FileSys {
 
-Archive_RomFS::Archive_RomFS(const Loader::AppLoader& app_loader) {
+ArchiveFactory_RomFS::ArchiveFactory_RomFS(const Loader::AppLoader& app_loader)
+        : romfs_data(std::make_shared<std::vector<u8>>()) {
     // Load the RomFS from the app
-    if (Loader::ResultStatus::Success != app_loader.ReadRomFS(raw_data)) {
+    if (Loader::ResultStatus::Success != app_loader.ReadRomFS(*romfs_data)) {
         LOG_ERROR(Service_FS, "Unable to read RomFS!");
     }
 }
 
+ResultVal<std::unique_ptr<ArchiveBackend>> ArchiveFactory_RomFS::Open(const Path& path) {
+    auto archive = Common::make_unique<IVFCArchive>(romfs_data);
+    return MakeResult<std::unique_ptr<ArchiveBackend>>(std::move(archive));
+}
+
+ResultCode ArchiveFactory_RomFS::Format(const Path& path) {
+    LOG_ERROR(Service_FS, "Attempted to format a RomFS archive.");
+    // TODO: Verify error code
+    return ResultCode(ErrorDescription::NotAuthorized, ErrorModule::FS,
+            ErrorSummary::NotSupported, ErrorLevel::Permanent);
+}
+
 } // namespace FileSys

src/core/file_sys/archive_romfs.h

@@ -4,6 +4,7 @@
 
 #pragma once
 
+#include <memory>
 #include <vector>
 
 #include "common/common_types.h"
@@ -17,12 +18,16 @@
 namespace FileSys {
 
 /// File system interface to the RomFS archive
-class Archive_RomFS final : public IVFCArchive {
+class ArchiveFactory_RomFS final : public ArchiveFactory {
 public:
-    Archive_RomFS(const Loader::AppLoader& app_loader);
+    ArchiveFactory_RomFS(const Loader::AppLoader& app_loader);
 
     std::string GetName() const override { return "RomFS"; }
-    ResultCode Open(const Path& path) override { return RESULT_SUCCESS; }
+    ResultVal<std::unique_ptr<ArchiveBackend>> Open(const Path& path) override;
+    ResultCode Format(const Path& path) override;
+
+private:
+    std::shared_ptr<std::vector<u8>> romfs_data;
 };
 
 } // namespace FileSys

src/core/file_sys/archive_savedata.cpp

@@ -6,6 +6,7 @@
 
 #include "common/common_types.h"
 #include "common/file_util.h"
+#include "common/make_unique.h"
 
 #include "core/file_sys/archive_savedata.h"
 #include "core/file_sys/disk_archive.h"
@@ -28,26 +29,28 @@ static std::string GetSaveDataPath(const std::string& mount_location, u64 progra
     return Common::StringFromFormat("%s%08x/%08x/data/00000001/", mount_location.c_str(), high, low);
 }
 
-Archive_SaveData::Archive_SaveData(const std::string& sdmc_directory)
-        : DiskArchive(GetSaveDataContainerPath(sdmc_directory)) {
+ArchiveFactory_SaveData::ArchiveFactory_SaveData(const std::string& sdmc_directory)
+        : mount_point(GetSaveDataContainerPath(sdmc_directory)) {
     LOG_INFO(Service_FS, "Directory %s set as SaveData.", this->mount_point.c_str());
 }
 
-ResultCode Archive_SaveData::Open(const Path& path) {
-    if (concrete_mount_point.empty())
-        concrete_mount_point = GetSaveDataPath(mount_point, Kernel::g_program_id);
+ResultVal<std::unique_ptr<ArchiveBackend>> ArchiveFactory_SaveData::Open(const Path& path) {
+    std::string concrete_mount_point = GetSaveDataPath(mount_point, Kernel::g_program_id);
     if (!FileUtil::Exists(concrete_mount_point)) {
         // When a SaveData archive is created for the first time, it is not yet formatted
-        // and the save file/directory structure expected by the game has not yet been initialized. 
-        // Returning the NotFormatted error code will signal the game to provision the SaveData archive 
-        // with the files and folders that it expects. 
+        // and the save file/directory structure expected by the game has not yet been initialized.
+        // Returning the NotFormatted error code will signal the game to provision the SaveData archive
+        // with the files and folders that it expects.
         return ResultCode(ErrorDescription::FS_NotFormatted, ErrorModule::FS,
             ErrorSummary::InvalidState, ErrorLevel::Status);
     }
-    return RESULT_SUCCESS;
+
+    auto archive = Common::make_unique<DiskArchive>(std::move(concrete_mount_point));
+    return MakeResult<std::unique_ptr<ArchiveBackend>>(std::move(archive));
 }
 
-ResultCode Archive_SaveData::Format(const Path& path) const {
+ResultCode ArchiveFactory_SaveData::Format(const Path& path) {
+    std::string concrete_mount_point = GetSaveDataPath(mount_point, Kernel::g_program_id);
     FileUtil::DeleteDirRecursively(concrete_mount_point);
     FileUtil::CreateFullPath(concrete_mount_point);
     return RESULT_SUCCESS;

src/core/file_sys/archive_savedata.h

@@ -15,22 +15,17 @@
 namespace FileSys {
 
 /// File system interface to the SaveData archive
-class Archive_SaveData final : public DiskArchive {
+class ArchiveFactory_SaveData final : public ArchiveFactory {
 public:
-    Archive_SaveData(const std::string& mount_point);
+    ArchiveFactory_SaveData(const std::string& mount_point);
 
     std::string GetName() const override { return "SaveData"; }
 
-    ResultCode Open(const Path& path) override;
+    ResultVal<std::unique_ptr<ArchiveBackend>> Open(const Path& path) override;
+    ResultCode Format(const Path& path) override;
 
-    ResultCode Format(const Path& path) const override;
-
-    const std::string& GetMountPoint() const override {
-        return concrete_mount_point;
-    }
-
-protected:
-    std::string concrete_mount_point;
+private:
+    std::string mount_point;
 };
 
 } // namespace FileSys

src/core/file_sys/archive_savedatacheck.cpp

@@ -3,6 +3,7 @@
 // Refer to the license.txt file included.
 
 #include "common/file_util.h"
+#include "common/make_unique.h"
 
 #include "core/file_sys/archive_savedatacheck.h"
 #include "core/hle/service/fs/archive.h"
@@ -21,32 +22,33 @@ static std::string GetSaveDataCheckPath(const std::string& mount_point, u32 high
             mount_point.c_str(), high, low);
 }
 
-Archive_SaveDataCheck::Archive_SaveDataCheck(const std::string& nand_directory) :
+ArchiveFactory_SaveDataCheck::ArchiveFactory_SaveDataCheck(const std::string& nand_directory) :
         mount_point(GetSaveDataCheckContainerPath(nand_directory)) {
 }
 
-ResultCode Archive_SaveDataCheck::Open(const Path& path) {
-    // TODO(Subv): We should not be overwriting raw_data everytime this function is called,
-    // but until we use factory classes to create the archives at runtime instead of creating them beforehand
-    // and allow multiple archives of the same type to be open at the same time without clobbering each other,
-    // we won't be able to maintain the state of each archive, hence we overwrite it every time it's needed.
-    // There are a number of problems with this, for example opening a file in this archive, then opening
-    // this archive again with a different path, will corrupt the previously open file.
+ResultVal<std::unique_ptr<ArchiveBackend>> ArchiveFactory_SaveDataCheck::Open(const Path& path) {
     auto vec = path.AsBinary();
     const u32* data = reinterpret_cast<u32*>(vec.data());
     std::string file_path = GetSaveDataCheckPath(mount_point, data[1], data[0]);
     FileUtil::IOFile file(file_path, "rb");
 
-    std::fill(raw_data.begin(), raw_data.end(), 0);
-
     if (!file.IsOpen()) {
         return ResultCode(-1); // TODO(Subv): Find the right error code
     }
     auto size = file.GetSize();
-    raw_data.resize(size);
-    file.ReadBytes(raw_data.data(), size);
+    auto raw_data = std::make_shared<std::vector<u8>>(size);
+    file.ReadBytes(raw_data->data(), size);
     file.Close();
-    return RESULT_SUCCESS;
+
+    auto archive = Common::make_unique<IVFCArchive>(std::move(raw_data));
+    return MakeResult<std::unique_ptr<ArchiveBackend>>(std::move(archive));
+}
+
+ResultCode ArchiveFactory_SaveDataCheck::Format(const Path& path) {
+    LOG_ERROR(Service_FS, "Attempted to format a SaveDataCheck archive.");
+    // TODO: Verify error code
+    return ResultCode(ErrorDescription::NotAuthorized, ErrorModule::FS,
+        ErrorSummary::NotSupported, ErrorLevel::Permanent);
 }
 
 } // namespace FileSys

src/core/file_sys/archive_savedatacheck.h

@@ -17,12 +17,14 @@
 namespace FileSys {
 
 /// File system interface to the SaveDataCheck archive
-class Archive_SaveDataCheck final : public IVFCArchive {
+class ArchiveFactory_SaveDataCheck final : public ArchiveFactory {
 public:
-    Archive_SaveDataCheck(const std::string& mount_point);
+    ArchiveFactory_SaveDataCheck(const std::string& mount_point);
 
     std::string GetName() const override { return "SaveDataCheck"; }
-    ResultCode Open(const Path& path) override;
+
+    ResultVal<std::unique_ptr<ArchiveBackend>> Open(const Path& path) override;
+    ResultCode Format(const Path& path) override;
 
 private:
     std::string mount_point;

src/core/file_sys/archive_sdmc.cpp

@@ -6,6 +6,7 @@
 
 #include "common/common_types.h"
 #include "common/file_util.h"
+#include "common/make_unique.h"
 
 #include "core/file_sys/archive_sdmc.h"
 #include "core/file_sys/disk_archive.h"
@@ -16,17 +17,17 @@
 
 namespace FileSys {
 
-Archive_SDMC::Archive_SDMC(const std::string& sdmc_directory) : DiskArchive(sdmc_directory) {
+ArchiveFactory_SDMC::ArchiveFactory_SDMC(const std::string& sdmc_directory) : sdmc_directory(sdmc_directory) {
     LOG_INFO(Service_FS, "Directory %s set as SDMC.", sdmc_directory.c_str());
 }
 
-bool Archive_SDMC::Initialize() {
+bool ArchiveFactory_SDMC::Initialize() {
     if (!Settings::values.use_virtual_sd) {
         LOG_WARNING(Service_FS, "SDMC disabled by config.");
         return false;
     }
 
-    if (!FileUtil::CreateFullPath(mount_point)) {
+    if (!FileUtil::CreateFullPath(sdmc_directory)) {
         LOG_ERROR(Service_FS, "Unable to create SDMC path.");
         return false;
     }
@@ -34,4 +35,14 @@ bool Archive_SDMC::Initialize() {
     return true;
 }
 
+ResultVal<std::unique_ptr<ArchiveBackend>> ArchiveFactory_SDMC::Open(const Path& path) {
+    auto archive = Common::make_unique<DiskArchive>(sdmc_directory);
+    return MakeResult<std::unique_ptr<ArchiveBackend>>(std::move(archive));
+}
+
+ResultCode ArchiveFactory_SDMC::Format(const Path& path) {
+    // This is kind of an undesirable operation, so let's just ignore it. :)
+    return RESULT_SUCCESS;
+}
+
 } // namespace FileSys

src/core/file_sys/archive_sdmc.h

@@ -15,9 +15,9 @@
 namespace FileSys {
 
 /// File system interface to the SDMC archive
-class Archive_SDMC final : public DiskArchive {
+class ArchiveFactory_SDMC final : public ArchiveFactory {
 public:
-    Archive_SDMC(const std::string& mount_point);
+    ArchiveFactory_SDMC(const std::string& mount_point);
 
     /**
      * Initialize the archive.
@@ -26,6 +26,12 @@ public:
     bool Initialize();
 
     std::string GetName() const override { return "SDMC"; }
+
+    ResultVal<std::unique_ptr<ArchiveBackend>> Open(const Path& path) override;
+    ResultCode Format(const Path& path) override;
+
+private:
+    std::string sdmc_directory;
 };
 
 } // namespace FileSys

src/core/file_sys/disk_archive.cpp

@@ -18,26 +18,26 @@ namespace FileSys {
 
 std::unique_ptr<FileBackend> DiskArchive::OpenFile(const Path& path, const Mode mode) const {
     LOG_DEBUG(Service_FS, "called path=%s mode=%01X", path.DebugStr().c_str(), mode.hex);
-    auto file = Common::make_unique<DiskFile>(this, path, mode);
+    auto file = Common::make_unique<DiskFile>(*this, path, mode);
     if (!file->Open())
         return nullptr;
     return std::move(file);
 }
 
 bool DiskArchive::DeleteFile(const Path& path) const {
-    return FileUtil::Delete(GetMountPoint() + path.AsString());
+    return FileUtil::Delete(mount_point + path.AsString());
 }
 
 bool DiskArchive::RenameFile(const Path& src_path, const Path& dest_path) const {
-    return FileUtil::Rename(GetMountPoint() + src_path.AsString(), GetMountPoint() + dest_path.AsString());
+    return FileUtil::Rename(mount_point + src_path.AsString(), mount_point + dest_path.AsString());
 }
 
 bool DiskArchive::DeleteDirectory(const Path& path) const {
-    return FileUtil::DeleteDir(GetMountPoint() + path.AsString());
+    return FileUtil::DeleteDir(mount_point + path.AsString());
 }
 
 ResultCode DiskArchive::CreateFile(const FileSys::Path& path, u32 size) const {
-    std::string full_path = GetMountPoint() + path.AsString();
+    std::string full_path = mount_point + path.AsString();
 
     if (FileUtil::Exists(full_path))
         return ResultCode(ErrorDescription::AlreadyExists, ErrorModule::FS, ErrorSummary::NothingHappened, ErrorLevel::Info);
@@ -58,16 +58,16 @@ ResultCode DiskArchive::CreateFile(const FileSys::Path& path, u32 size) const {
 
 
 bool DiskArchive::CreateDirectory(const Path& path) const {
-    return FileUtil::CreateDir(GetMountPoint() + path.AsString());
+    return FileUtil::CreateDir(mount_point + path.AsString());
 }
 
 bool DiskArchive::RenameDirectory(const Path& src_path, const Path& dest_path) const {
-    return FileUtil::Rename(GetMountPoint() + src_path.AsString(), GetMountPoint() + dest_path.AsString());
+    return FileUtil::Rename(mount_point + src_path.AsString(), mount_point + dest_path.AsString());
 }
 
 std::unique_ptr<DirectoryBackend> DiskArchive::OpenDirectory(const Path& path) const {
     LOG_DEBUG(Service_FS, "called path=%s", path.DebugStr().c_str());
-    auto directory = Common::make_unique<DiskDirectory>(this, path);
+    auto directory = Common::make_unique<DiskDirectory>(*this, path);
     if (!directory->Open())
         return nullptr;
     return std::move(directory);
@@ -75,13 +75,12 @@ std::unique_ptr<DirectoryBackend> DiskArchive::OpenDirectory(const Path& path) c
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-DiskFile::DiskFile(const DiskArchive* archive, const Path& path, const Mode mode) {
+DiskFile::DiskFile(const DiskArchive& archive, const Path& path, const Mode mode) {
     // TODO(Link Mauve): normalize path into an absolute path without "..", it can currently bypass
     // the root directory we set while opening the archive.
     // For example, opening /../../etc/passwd can give the emulated program your users list.
-    this->path = archive->GetMountPoint() + path.AsString();
+    this->path = archive.mount_point + path.AsString();
     this->mode.hex = mode.hex;
-    this->archive = archive;
 }
 
 bool DiskFile::Open() {
@@ -134,12 +133,11 @@ bool DiskFile::Close() const {
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-DiskDirectory::DiskDirectory(const DiskArchive* archive, const Path& path) {
+DiskDirectory::DiskDirectory(const DiskArchive& archive, const Path& path) {
     // TODO(Link Mauve): normalize path into an absolute path without "..", it can currently bypass
     // the root directory we set while opening the archive.
     // For example, opening /../../usr/bin can give the emulated program your installed programs.
-    this->path = archive->GetMountPoint() + path.AsString();
-    this->archive = archive;
+    this->path = archive.mount_point + path.AsString();
 }
 
 bool DiskDirectory::Open() {

src/core/file_sys/disk_archive.h

@@ -24,8 +24,8 @@ class DiskArchive : public ArchiveBackend {
 public:
     DiskArchive(const std::string& mount_point_) : mount_point(mount_point_) {}
 
-    virtual std::string GetName() const = 0;
-    virtual ResultCode Format(const Path& path) const { return RESULT_SUCCESS; }
+    virtual std::string GetName() const { return "DiskArchive: " + mount_point; }
+
     std::unique_ptr<FileBackend> OpenFile(const Path& path, const Mode mode) const override;
     bool DeleteFile(const Path& path) const override;
     bool RenameFile(const Path& src_path, const Path& dest_path) const override;
@@ -35,26 +35,17 @@ public:
     bool RenameDirectory(const Path& src_path, const Path& dest_path) const override;
     std::unique_ptr<DirectoryBackend> OpenDirectory(const Path& path) const override;
 
-    virtual ResultCode Open(const Path& path) override {
-        return RESULT_SUCCESS;
-    }
-
-    /**
-     * Getter for the path used for this Archive
-     * @return Mount point of that passthrough archive
-     */
-    virtual const std::string& GetMountPoint() const {
-        return mount_point;
-    }
-
 protected:
+    friend class DiskFile;
+    friend class DiskDirectory;
+
     std::string mount_point;
 };
 
 class DiskFile : public FileBackend {
 public:
     DiskFile();
-    DiskFile(const DiskArchive* archive, const Path& path, const Mode mode);
+    DiskFile(const DiskArchive& archive, const Path& path, const Mode mode);
 
     bool Open() override;
     size_t Read(const u64 offset, const u32 length, u8* buffer) const override;
@@ -68,7 +59,6 @@ public:
     }
 
 protected:
-    const DiskArchive* archive;
     std::string path;
     Mode mode;
     std::unique_ptr<FileUtil::IOFile> file;
@@ -77,7 +67,7 @@ protected:
 class DiskDirectory : public DirectoryBackend {
 public:
     DiskDirectory();
-    DiskDirectory(const DiskArchive* archive, const Path& path);
+    DiskDirectory(const DiskArchive& archive, const Path& path);
 
     ~DiskDirectory() override {
         Close();
@@ -91,7 +81,6 @@ public:
     }
 
 protected:
-    const DiskArchive* archive;
     std::string path;
     u32 total_entries_in_directory;
     FileUtil::FSTEntry directory;

src/core/file_sys/ivfc_archive.cpp

@@ -15,11 +15,15 @@
 
 namespace FileSys {
 
-IVFCArchive::IVFCArchive() {
+IVFCArchive::IVFCArchive(std::shared_ptr<const std::vector<u8>> data) : data(data) {
+}
+
+std::string IVFCArchive::GetName() const {
+    return "IVFC";
 }
 
 std::unique_ptr<FileBackend> IVFCArchive::OpenFile(const Path& path, const Mode mode) const {
-    return Common::make_unique<IVFCFile>(this);
+    return Common::make_unique<IVFCFile>(data);
 }
 
 bool IVFCArchive::DeleteFile(const Path& path) const {
@@ -57,31 +61,25 @@ std::unique_ptr<DirectoryBackend> IVFCArchive::OpenDirectory(const Path& path) c
     return Common::make_unique<IVFCDirectory>();
 }
 
-ResultCode IVFCArchive::Format(const Path& path) const {
-    LOG_CRITICAL(Service_FS, "Attempted to format an IVFC archive (%s).", GetName().c_str());
-    // TODO: Verify error code
-    return ResultCode(ErrorDescription::NotAuthorized, ErrorModule::FS, ErrorSummary::NotSupported, ErrorLevel::Permanent);
-}
-
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
 size_t IVFCFile::Read(const u64 offset, const u32 length, u8* buffer) const {
     LOG_TRACE(Service_FS, "called offset=%llu, length=%d", offset, length);
-    memcpy(buffer, &archive->raw_data[(u32)offset], length);
+    memcpy(buffer, data->data() + offset, length);
     return length;
 }
 
 size_t IVFCFile::Write(const u64 offset, const u32 length, const u32 flush, const u8* buffer) const {
-    LOG_CRITICAL(Service_FS, "Attempted to write to IVFC file in archive %s.", archive->GetName().c_str());
+    LOG_ERROR(Service_FS, "Attempted to write to IVFC file");
     return 0;
 }
 
 size_t IVFCFile::GetSize() const {
-    return sizeof(u8) * archive->raw_data.size();
+    return sizeof(u8) * data->size();
 }
 
 bool IVFCFile::SetSize(const u64 size) const {
-    LOG_CRITICAL(Service_FS, "Attempted to set the size of an IVFC file in archive %s", archive->GetName().c_str());
+    LOG_ERROR(Service_FS, "Attempted to set the size of an IVFC file");
     return false;
 }
 

src/core/file_sys/ivfc_archive.h

@@ -4,6 +4,7 @@
 
 #pragma once
 
+#include <memory>
 #include <vector>
 
 #include "common/common_types.h"
@@ -23,7 +24,9 @@ namespace FileSys {
  */
 class IVFCArchive : public ArchiveBackend {
 public:
-    IVFCArchive();
+    IVFCArchive(std::shared_ptr<const std::vector<u8>> data);
+
+    std::string GetName() const override;
 
     std::unique_ptr<FileBackend> OpenFile(const Path& path, const Mode mode) const override;
     bool DeleteFile(const Path& path) const override;
@@ -33,16 +36,14 @@ public:
     bool CreateDirectory(const Path& path) const override;
     bool RenameDirectory(const Path& src_path, const Path& dest_path) const override;
     std::unique_ptr<DirectoryBackend> OpenDirectory(const Path& path) const override;
-    ResultCode Format(const Path& path) const override;
 
 protected:
-    friend class IVFCFile;
-    std::vector<u8> raw_data;
+    std::shared_ptr<const std::vector<u8>> data;
 };
 
 class IVFCFile : public FileBackend {
 public:
-    IVFCFile(const IVFCArchive* archive) : archive(archive) {}
+    IVFCFile(std::shared_ptr<const std::vector<u8>> data) : data(data) {}
 
     bool Open() override { return true; }
     size_t Read(const u64 offset, const u32 length, u8* buffer) const override;
@@ -53,7 +54,7 @@ public:
     void Flush() const override { }
 
 private:
-    const IVFCArchive* archive;
+    std::shared_ptr<const std::vector<u8>> data;
 };
 
 class IVFCDirectory : public DirectoryBackend {

src/core/hle/result.h

@@ -307,14 +307,14 @@ public:
     }
 
     ResultVal& operator=(const ResultVal& o) {
-        if (*this) {
-            if (o) {
+        if (!empty()) {
+            if (!o.empty()) {
                 *GetPointer() = *o.GetPointer();
             } else {
                 GetPointer()->~T();
             }
         } else {
-            if (o) {
+            if (!o.empty()) {
                 new (&storage) T(*o.GetPointer());
             }
         }

src/core/hle/service/fs/archive.cpp

@@ -5,6 +5,8 @@
 #include <memory>
 #include <unordered_map>
 
+#include <boost/container/flat_map.hpp>
+
 #include "common/common_types.h"
 #include "common/file_util.h"
 #include "common/make_unique.h"
@@ -18,7 +20,6 @@
 #include "core/file_sys/archive_sdmc.h"
 #include "core/file_sys/directory_backend.h"
 #include "core/hle/service/fs/archive.h"
-#include "core/hle/kernel/session.h"
 #include "core/hle/result.h"
 
 // Specializes std::hash for ArchiveIdCode, so that we can use it in std::unordered_map.
@@ -74,43 +75,19 @@ enum class DirectoryCommand : u32 {
     Close           = 0x08020000,
 };
 
-class Archive {
-public:
-    Archive(std::unique_ptr<FileSys::ArchiveBackend>&& backend, ArchiveIdCode id_code)
-            : id_code(id_code), backend(std::move(backend)) {
-    }
-
-    std::string GetName() const { return "Archive: " + backend->GetName(); }
-
-    ArchiveIdCode id_code; ///< Id code of the archive
-    std::unique_ptr<FileSys::ArchiveBackend> backend; ///< Archive backend interface
-};
-
-class File : public Kernel::Session {
-public:
-    File(std::unique_ptr<FileSys::FileBackend>&& backend, const FileSys::Path& path)
-            : path(path), priority(0), backend(std::move(backend)) {
-    }
-
-    std::string GetName() const override { return "Path: " + path.DebugStr(); }
-
-    FileSys::Path path; ///< Path of the file
-    u32 priority; ///< Priority of the file. TODO(Subv): Find out what this means
-    std::unique_ptr<FileSys::FileBackend> backend; ///< File backend interface
-
-    ResultVal<bool> SyncRequest() override {
-        u32* cmd_buff = Kernel::GetCommandBuffer();
-        FileCommand cmd = static_cast<FileCommand>(cmd_buff[0]);
-        switch (cmd) {
+ResultVal<bool> File::SyncRequest() {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+    FileCommand cmd = static_cast<FileCommand>(cmd_buff[0]);
+    switch (cmd) {
 
         // Read from file...
         case FileCommand::Read:
         {
-            u64 offset = cmd_buff[1] | ((u64) cmd_buff[2]) << 32;
-            u32 length  = cmd_buff[3];
+            u64 offset = cmd_buff[1] | ((u64)cmd_buff[2]) << 32;
+            u32 length = cmd_buff[3];
             u32 address = cmd_buff[5];
             LOG_TRACE(Service_FS, "Read %s %s: offset=0x%llx length=%d address=0x%x",
-                      GetTypeName().c_str(), GetName().c_str(), offset, length, address);
+                GetTypeName().c_str(), GetName().c_str(), offset, length, address);
             cmd_buff[2] = backend->Read(offset, length, Memory::GetPointer(address));
             break;
         }
@@ -118,12 +95,12 @@ public:
         // Write to file...
         case FileCommand::Write:
         {
-            u64 offset  = cmd_buff[1] | ((u64) cmd_buff[2]) << 32;
-            u32 length  = cmd_buff[3];
-            u32 flush   = cmd_buff[4];
+            u64 offset = cmd_buff[1] | ((u64)cmd_buff[2]) << 32;
+            u32 length = cmd_buff[3];
+            u32 flush = cmd_buff[4];
             u32 address = cmd_buff[6];
             LOG_TRACE(Service_FS, "Write %s %s: offset=0x%llx length=%d address=0x%x, flush=0x%x",
-                      GetTypeName().c_str(), GetName().c_str(), offset, length, address, flush);
+                GetTypeName().c_str(), GetName().c_str(), offset, length, address, flush);
             cmd_buff[2] = backend->Write(offset, length, flush, Memory::GetPointer(address));
             break;
         }
@@ -141,7 +118,7 @@ public:
         {
             u64 size = cmd_buff[1] | ((u64)cmd_buff[2] << 32);
             LOG_TRACE(Service_FS, "SetSize %s %s size=%llu",
-                    GetTypeName().c_str(), GetName().c_str(), size);
+                GetTypeName().c_str(), GetName().c_str(), size);
             backend->SetSize(size);
             break;
         }
@@ -187,27 +164,15 @@ public:
             ResultCode error = UnimplementedFunction(ErrorModule::FS);
             cmd_buff[1] = error.raw; // TODO(Link Mauve): use the correct error code for that.
             return error;
-        }
-        cmd_buff[1] = 0; // No error
-        return MakeResult<bool>(false);
     }
-};
-
-class Directory : public Kernel::Session {
-public:
-    Directory(std::unique_ptr<FileSys::DirectoryBackend>&& backend, const FileSys::Path& path)
-            : path(path), backend(std::move(backend)) {
-    }
-
-    std::string GetName() const override { return "Directory: " + path.DebugStr(); }
-
-    FileSys::Path path; ///< Path of the directory
-    std::unique_ptr<FileSys::DirectoryBackend> backend; ///< File backend interface
+    cmd_buff[1] = RESULT_SUCCESS.raw; // No error
+    return MakeResult<bool>(false);
+}
 
-    ResultVal<bool> SyncRequest() override {
-        u32* cmd_buff = Kernel::GetCommandBuffer();
-        DirectoryCommand cmd = static_cast<DirectoryCommand>(cmd_buff[0]);
-        switch (cmd) {
+ResultVal<bool> Directory::SyncRequest() {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+    DirectoryCommand cmd = static_cast<DirectoryCommand>(cmd_buff[0]);
+    switch (cmd) {
 
         // Read from directory...
         case DirectoryCommand::Read:
@@ -216,7 +181,7 @@ public:
             u32 address = cmd_buff[3];
             auto entries = reinterpret_cast<FileSys::Entry*>(Memory::GetPointer(address));
             LOG_TRACE(Service_FS, "Read %s %s: count=%d",
-                    GetTypeName().c_str(), GetName().c_str(), count);
+                GetTypeName().c_str(), GetName().c_str(), count);
 
             // Number of entries actually read
             cmd_buff[2] = backend->Read(count, entries);
@@ -236,29 +201,31 @@ public:
             ResultCode error = UnimplementedFunction(ErrorModule::FS);
             cmd_buff[1] = error.raw; // TODO(Link Mauve): use the correct error code for that.
             return MakeResult<bool>(false);
-        }
-        cmd_buff[1] = 0; // No error
-        return MakeResult<bool>(false);
     }
-};
+    cmd_buff[1] = RESULT_SUCCESS.raw; // No error
+    return MakeResult<bool>(false);
+}
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
+using FileSys::ArchiveBackend;
+using FileSys::ArchiveFactory;
+
 /**
  * Map of registered archives, identified by id code. Once an archive is registered here, it is
  * never removed until the FS service is shut down.
  */
-static std::unordered_map<ArchiveIdCode, std::unique_ptr<Archive>> id_code_map;
+static boost::container::flat_map<ArchiveIdCode, std::unique_ptr<ArchiveFactory>> id_code_map;
 
 /**
  * Map of active archive handles. Values are pointers to the archives in `idcode_map`.
  */
-static std::unordered_map<ArchiveHandle, Archive*> handle_map;
+static std::unordered_map<ArchiveHandle, std::unique_ptr<ArchiveBackend>> handle_map;
 static ArchiveHandle next_handle;
 
-static Archive* GetArchive(ArchiveHandle handle) {
+static ArchiveBackend* GetArchive(ArchiveHandle handle) {
     auto itr = handle_map.find(handle);
-    return (itr == handle_map.end()) ? nullptr : itr->second;
+    return (itr == handle_map.end()) ? nullptr : itr->second.get();
 }
 
 ResultVal<ArchiveHandle> OpenArchive(ArchiveIdCode id_code, FileSys::Path& archive_path) {
@@ -271,15 +238,13 @@ ResultVal<ArchiveHandle> OpenArchive(ArchiveIdCode id_code, FileSys::Path& archi
                           ErrorSummary::NotFound, ErrorLevel::Permanent);
     }
 
-    ResultCode res = itr->second->backend->Open(archive_path);
-    if (!res.IsSuccess())
-        return res;
+    CASCADE_RESULT(std::unique_ptr<ArchiveBackend> res, itr->second->Open(archive_path));
 
     // This should never even happen in the first place with 64-bit handles, 
     while (handle_map.count(next_handle) != 0) {
         ++next_handle;
     }
-    handle_map.emplace(next_handle, itr->second.get());
+    handle_map.emplace(next_handle, std::move(res));
     return MakeResult<ArchiveHandle>(next_handle++);
 }
 
@@ -292,39 +257,39 @@ ResultCode CloseArchive(ArchiveHandle handle) {
 
 // TODO(yuriks): This might be what the fs:REG service is for. See the Register/Unregister calls in
 // http://3dbrew.org/wiki/Filesystem_services#ProgramRegistry_service_.22fs:REG.22
-ResultCode CreateArchive(std::unique_ptr<FileSys::ArchiveBackend>&& backend, ArchiveIdCode id_code) {
-    auto result = id_code_map.emplace(id_code, Common::make_unique<Archive>(std::move(backend), id_code));
+ResultCode RegisterArchiveType(std::unique_ptr<FileSys::ArchiveFactory>&& factory, ArchiveIdCode id_code) {
+    auto result = id_code_map.emplace(id_code, std::move(factory));
 
     bool inserted = result.second;
-    _dbg_assert_msg_(Service_FS, inserted, "Tried to register more than one archive with same id code");
+    _assert_msg_(Service_FS, inserted, "Tried to register more than one archive with same id code");
 
     auto& archive = result.first->second;
     LOG_DEBUG(Service_FS, "Registered archive %s with id code 0x%08X", archive->GetName().c_str(), id_code);
     return RESULT_SUCCESS;
 }
 
-ResultVal<Kernel::SharedPtr<Kernel::Session>> OpenFileFromArchive(ArchiveHandle archive_handle,
+ResultVal<Kernel::SharedPtr<File>> OpenFileFromArchive(ArchiveHandle archive_handle,
         const FileSys::Path& path, const FileSys::Mode mode) {
-    Archive* archive = GetArchive(archive_handle);
+    ArchiveBackend* archive = GetArchive(archive_handle);
     if (archive == nullptr)
         return ERR_INVALID_HANDLE;
 
-    std::unique_ptr<FileSys::FileBackend> backend = archive->backend->OpenFile(path, mode);
+    std::unique_ptr<FileSys::FileBackend> backend = archive->OpenFile(path, mode);
     if (backend == nullptr) {
         return ResultCode(ErrorDescription::FS_NotFound, ErrorModule::FS,
                           ErrorSummary::NotFound, ErrorLevel::Status);
     }
 
     auto file = Kernel::SharedPtr<File>(new File(std::move(backend), path));
-    return MakeResult<Kernel::SharedPtr<Kernel::Session>>(std::move(file));
+    return MakeResult<Kernel::SharedPtr<File>>(std::move(file));
 }
 
 ResultCode DeleteFileFromArchive(ArchiveHandle archive_handle, const FileSys::Path& path) {
-    Archive* archive = GetArchive(archive_handle);
+    ArchiveBackend* archive = GetArchive(archive_handle);
     if (archive == nullptr)
         return ERR_INVALID_HANDLE;
 
-    if (archive->backend->DeleteFile(path))
+    if (archive->DeleteFile(path))
         return RESULT_SUCCESS;
     return ResultCode(ErrorDescription::NoData, ErrorModule::FS, // TODO: verify description
                       ErrorSummary::Canceled, ErrorLevel::Status);
@@ -332,13 +297,13 @@ ResultCode DeleteFileFromArchive(ArchiveHandle archive_handle, const FileSys::Pa
 
 ResultCode RenameFileBetweenArchives(ArchiveHandle src_archive_handle, const FileSys::Path& src_path,
                                      ArchiveHandle dest_archive_handle, const FileSys::Path& dest_path) {
-    Archive* src_archive = GetArchive(src_archive_handle);
-    Archive* dest_archive = GetArchive(dest_archive_handle);
+    ArchiveBackend* src_archive = GetArchive(src_archive_handle);
+    ArchiveBackend* dest_archive = GetArchive(dest_archive_handle);
     if (src_archive == nullptr || dest_archive == nullptr)
         return ERR_INVALID_HANDLE;
 
     if (src_archive == dest_archive) {
-        if (src_archive->backend->RenameFile(src_path, dest_path))
+        if (src_archive->RenameFile(src_path, dest_path))
             return RESULT_SUCCESS;
     } else {
         // TODO: Implement renaming across archives
@@ -352,30 +317,30 @@ ResultCode RenameFileBetweenArchives(ArchiveHandle src_archive_handle, const Fil
 }
 
 ResultCode DeleteDirectoryFromArchive(ArchiveHandle archive_handle, const FileSys::Path& path) {
-    Archive* archive = GetArchive(archive_handle);
+    ArchiveBackend* archive = GetArchive(archive_handle);
     if (archive == nullptr)
         return ERR_INVALID_HANDLE;
 
-    if (archive->backend->DeleteDirectory(path))
+    if (archive->DeleteDirectory(path))
         return RESULT_SUCCESS;
     return ResultCode(ErrorDescription::NoData, ErrorModule::FS, // TODO: verify description
                       ErrorSummary::Canceled, ErrorLevel::Status);
 }
 
 ResultCode CreateFileInArchive(ArchiveHandle archive_handle, const FileSys::Path& path, u32 file_size) {
-    Archive* archive = GetArchive(archive_handle);
+    ArchiveBackend* archive = GetArchive(archive_handle);
     if (archive == nullptr)
         return ERR_INVALID_HANDLE;
 
-    return archive->backend->CreateFile(path, file_size);
+    return archive->CreateFile(path, file_size);
 }
 
 ResultCode CreateDirectoryFromArchive(ArchiveHandle archive_handle, const FileSys::Path& path) {
-    Archive* archive = GetArchive(archive_handle);
+    ArchiveBackend* archive = GetArchive(archive_handle);
     if (archive == nullptr)
         return ERR_INVALID_HANDLE;
 
-    if (archive->backend->CreateDirectory(path))
+    if (archive->CreateDirectory(path))
         return RESULT_SUCCESS;
     return ResultCode(ErrorDescription::NoData, ErrorModule::FS, // TODO: verify description
                       ErrorSummary::Canceled, ErrorLevel::Status);
@@ -383,13 +348,13 @@ ResultCode CreateDirectoryFromArchive(ArchiveHandle archive_handle, const FileSy
 
 ResultCode RenameDirectoryBetweenArchives(ArchiveHandle src_archive_handle, const FileSys::Path& src_path,
                                           ArchiveHandle dest_archive_handle, const FileSys::Path& dest_path) {
-    Archive* src_archive = GetArchive(src_archive_handle);
-    Archive* dest_archive = GetArchive(dest_archive_handle);
+    ArchiveBackend* src_archive = GetArchive(src_archive_handle);
+    ArchiveBackend* dest_archive = GetArchive(dest_archive_handle);
     if (src_archive == nullptr || dest_archive == nullptr)
         return ERR_INVALID_HANDLE;
 
     if (src_archive == dest_archive) {
-        if (src_archive->backend->RenameDirectory(src_path, dest_path))
+        if (src_archive->RenameDirectory(src_path, dest_path))
             return RESULT_SUCCESS;
     } else {
         // TODO: Implement renaming across archives
@@ -402,31 +367,29 @@ ResultCode RenameDirectoryBetweenArchives(ArchiveHandle src_archive_handle, cons
                       ErrorSummary::NothingHappened, ErrorLevel::Status);
 }
 
-ResultVal<Kernel::SharedPtr<Kernel::Session>> OpenDirectoryFromArchive(ArchiveHandle archive_handle,
+ResultVal<Kernel::SharedPtr<Directory>> OpenDirectoryFromArchive(ArchiveHandle archive_handle,
         const FileSys::Path& path) {
-    Archive* archive = GetArchive(archive_handle);
+    ArchiveBackend* archive = GetArchive(archive_handle);
     if (archive == nullptr)
         return ERR_INVALID_HANDLE;
 
-    std::unique_ptr<FileSys::DirectoryBackend> backend = archive->backend->OpenDirectory(path);
+    std::unique_ptr<FileSys::DirectoryBackend> backend = archive->OpenDirectory(path);
     if (backend == nullptr) {
         return ResultCode(ErrorDescription::NotFound, ErrorModule::FS,
                           ErrorSummary::NotFound, ErrorLevel::Permanent);
     }
 
     auto directory = Kernel::SharedPtr<Directory>(new Directory(std::move(backend), path));
-    return MakeResult<Kernel::SharedPtr<Kernel::Session>>(std::move(directory));
+    return MakeResult<Kernel::SharedPtr<Directory>>(std::move(directory));
 }
 
-ResultCode FormatSaveData() {
-    // Do not create the archive again if it already exists
-    auto archive_itr = id_code_map.find(ArchiveIdCode::SaveData);
+ResultCode FormatArchive(ArchiveIdCode id_code, const FileSys::Path& path) {
+    auto archive_itr = id_code_map.find(id_code);
     if (archive_itr == id_code_map.end()) {
         return UnimplementedFunction(ErrorModule::FS); // TODO(Subv): Find the right error
     }
 
-    // Use an empty path, we do not use it when formatting the savedata
-    return archive_itr->second->backend->Format(FileSys::Path());
+    return archive_itr->second->Format(path);
 }
 
 ResultCode CreateExtSaveData(u32 high, u32 low) {
@@ -460,32 +423,32 @@ void ArchiveInit() {
 
     std::string sdmc_directory = FileUtil::GetUserPath(D_SDMC_IDX);
     std::string nand_directory = FileUtil::GetUserPath(D_NAND_IDX);
-    auto sdmc_archive = Common::make_unique<FileSys::Archive_SDMC>(sdmc_directory);
-    if (sdmc_archive->Initialize())
-        CreateArchive(std::move(sdmc_archive), ArchiveIdCode::SDMC);
+    auto sdmc_factory = Common::make_unique<FileSys::ArchiveFactory_SDMC>(sdmc_directory);
+    if (sdmc_factory->Initialize())
+        RegisterArchiveType(std::move(sdmc_factory), ArchiveIdCode::SDMC);
     else
         LOG_ERROR(Service_FS, "Can't instantiate SDMC archive with path %s", sdmc_directory.c_str());
     
     // Create the SaveData archive
-    auto savedata_archive = Common::make_unique<FileSys::Archive_SaveData>(sdmc_directory);
-    CreateArchive(std::move(savedata_archive), ArchiveIdCode::SaveData);
+    auto savedata_factory = Common::make_unique<FileSys::ArchiveFactory_SaveData>(sdmc_directory);
+    RegisterArchiveType(std::move(savedata_factory), ArchiveIdCode::SaveData);
 
-    auto extsavedata_archive = Common::make_unique<FileSys::Archive_ExtSaveData>(sdmc_directory, false);
-    if (extsavedata_archive->Initialize())
-        CreateArchive(std::move(extsavedata_archive), ArchiveIdCode::ExtSaveData);
+    auto extsavedata_factory = Common::make_unique<FileSys::ArchiveFactory_ExtSaveData>(sdmc_directory, false);
+    if (extsavedata_factory->Initialize())
+        RegisterArchiveType(std::move(extsavedata_factory), ArchiveIdCode::ExtSaveData);
     else
-        LOG_ERROR(Service_FS, "Can't instantiate ExtSaveData archive with path %s", extsavedata_archive->GetMountPoint().c_str());
+        LOG_ERROR(Service_FS, "Can't instantiate ExtSaveData archive with path %s", extsavedata_factory->GetMountPoint().c_str());
 
-    auto sharedextsavedata_archive = Common::make_unique<FileSys::Archive_ExtSaveData>(nand_directory, true);
-    if (sharedextsavedata_archive->Initialize())
-        CreateArchive(std::move(sharedextsavedata_archive), ArchiveIdCode::SharedExtSaveData);
+    auto sharedextsavedata_factory = Common::make_unique<FileSys::ArchiveFactory_ExtSaveData>(nand_directory, true);
+    if (sharedextsavedata_factory->Initialize())
+        RegisterArchiveType(std::move(sharedextsavedata_factory), ArchiveIdCode::SharedExtSaveData);
     else
         LOG_ERROR(Service_FS, "Can't instantiate SharedExtSaveData archive with path %s", 
-            sharedextsavedata_archive->GetMountPoint().c_str());
+            sharedextsavedata_factory->GetMountPoint().c_str());
 
     // Create the SaveDataCheck archive, basically a small variation of the RomFS archive
-    auto savedatacheck_archive = Common::make_unique<FileSys::Archive_SaveDataCheck>(nand_directory);
-    CreateArchive(std::move(savedatacheck_archive), ArchiveIdCode::SaveDataCheck);
+    auto savedatacheck_factory = Common::make_unique<FileSys::ArchiveFactory_SaveDataCheck>(nand_directory);
+    RegisterArchiveType(std::move(savedatacheck_factory), ArchiveIdCode::SaveDataCheck);
 }
 
 /// Shutdown archives

src/core/hle/service/fs/archive.h

@@ -8,6 +8,7 @@
 
 #include "core/file_sys/archive_backend.h"
 #include "core/hle/kernel/kernel.h"
+#include "core/hle/kernel/session.h"
 #include "core/hle/result.h"
 
 /// The unique system identifier hash, also known as ID0
@@ -36,6 +37,35 @@ enum class ArchiveIdCode : u32 {
 
 typedef u64 ArchiveHandle;
 
+class File : public Kernel::Session {
+public:
+    File(std::unique_ptr<FileSys::FileBackend>&& backend, const FileSys::Path& path)
+        : path(path), priority(0), backend(std::move(backend)) {
+    }
+
+    std::string GetName() const override { return "Path: " + path.DebugStr(); }
+
+    FileSys::Path path; ///< Path of the file
+    u32 priority; ///< Priority of the file. TODO(Subv): Find out what this means
+    std::unique_ptr<FileSys::FileBackend> backend; ///< File backend interface
+
+    ResultVal<bool> SyncRequest() override;
+};
+
+class Directory : public Kernel::Session {
+public:
+    Directory(std::unique_ptr<FileSys::DirectoryBackend>&& backend, const FileSys::Path& path)
+        : path(path), backend(std::move(backend)) {
+    }
+
+    std::string GetName() const override { return "Directory: " + path.DebugStr(); }
+
+    FileSys::Path path; ///< Path of the directory
+    std::unique_ptr<FileSys::DirectoryBackend> backend; ///< File backend interface
+
+    ResultVal<bool> SyncRequest() override;
+};
+
 /**
  * Opens an archive
  * @param id_code IdCode of the archive to open
@@ -51,11 +81,11 @@ ResultVal<ArchiveHandle> OpenArchive(ArchiveIdCode id_code, FileSys::Path& archi
 ResultCode CloseArchive(ArchiveHandle handle);
 
 /**
- * Creates an Archive
+ * Registers an Archive type, instances of which can later be opened using its IdCode.
  * @param backend File system backend interface to the archive
  * @param id_code Id code used to access this type of archive
  */
-ResultCode CreateArchive(std::unique_ptr<FileSys::ArchiveBackend>&& backend, ArchiveIdCode id_code);
+ResultCode RegisterArchiveType(std::unique_ptr<FileSys::ArchiveFactory>&& factory, ArchiveIdCode id_code);
 
 /**
  * Open a File from an Archive
@@ -64,7 +94,7 @@ ResultCode CreateArchive(std::unique_ptr<FileSys::ArchiveBackend>&& backend, Arc
  * @param mode Mode under which to open the File
  * @return The opened File object as a Session
  */
-ResultVal<Kernel::SharedPtr<Kernel::Session>> OpenFileFromArchive(ArchiveHandle archive_handle,
+ResultVal<Kernel::SharedPtr<File>> OpenFileFromArchive(ArchiveHandle archive_handle,
         const FileSys::Path& path, const FileSys::Mode mode);
 
 /**
@@ -128,14 +158,17 @@ ResultCode RenameDirectoryBetweenArchives(ArchiveHandle src_archive_handle, cons
  * @param path Path to the Directory inside of the Archive
  * @return The opened Directory object as a Session
  */
-ResultVal<Kernel::SharedPtr<Kernel::Session>> OpenDirectoryFromArchive(ArchiveHandle archive_handle,
+ResultVal<Kernel::SharedPtr<Directory>> OpenDirectoryFromArchive(ArchiveHandle archive_handle,
         const FileSys::Path& path);
 
 /**
- * Creates a blank SaveData archive.
+ * Erases the contents of the physical folder that contains the archive
+ * identified by the specified id code and path
+ * @param id_code The id of the archive to format
+ * @param path The path to the archive, if relevant.
  * @return ResultCode 0 on success or the corresponding code on error
  */
-ResultCode FormatSaveData();
+ResultCode FormatArchive(ArchiveIdCode id_code, const FileSys::Path& path = FileSys::Path());
 
 /**
  * Creates a blank SharedExtSaveData archive for the specified extdata ID

src/core/hle/service/fs/fs_user.cpp

@@ -61,7 +61,7 @@ static void OpenFile(Service::Interface* self) {
 
     LOG_DEBUG(Service_FS, "path=%s, mode=%d attrs=%u", file_path.DebugStr().c_str(), mode.hex, attributes);
 
-    ResultVal<SharedPtr<Session>> file_res = OpenFileFromArchive(archive_handle, file_path, mode);
+    ResultVal<SharedPtr<File>> file_res = OpenFileFromArchive(archive_handle, file_path, mode);
     cmd_buff[1] = file_res.Code().raw;
     if (file_res.Succeeded()) {
         cmd_buff[3] = Kernel::g_handle_table.Create(*file_res).MoveFrom();
@@ -117,7 +117,7 @@ static void OpenFileDirectly(Service::Interface* self) {
     }
     SCOPE_EXIT({ CloseArchive(*archive_handle); });
 
-    ResultVal<SharedPtr<Session>> file_res = OpenFileFromArchive(*archive_handle, file_path, mode);
+    ResultVal<SharedPtr<File>> file_res = OpenFileFromArchive(*archive_handle, file_path, mode);
     cmd_buff[1] = file_res.Code().raw;
     if (file_res.Succeeded()) {
         cmd_buff[3] = Kernel::g_handle_table.Create(*file_res).MoveFrom();
@@ -337,7 +337,7 @@ static void OpenDirectory(Service::Interface* self) {
 
     LOG_DEBUG(Service_FS, "type=%d size=%d data=%s", dirname_type, dirname_size, dir_path.DebugStr().c_str());
 
-    ResultVal<SharedPtr<Session>> dir_res = OpenDirectoryFromArchive(archive_handle, dir_path);
+    ResultVal<SharedPtr<Directory>> dir_res = OpenDirectoryFromArchive(archive_handle, dir_path);
     cmd_buff[1] = dir_res.Code().raw;
     if (dir_res.Succeeded()) {
         cmd_buff[3] = Kernel::g_handle_table.Create(*dir_res).MoveFrom();
@@ -468,7 +468,7 @@ static void FormatSaveData(Service::Interface* self) {
         return;
     }
 
-    cmd_buff[1] = FormatSaveData().raw;
+    cmd_buff[1] = FormatArchive(ArchiveIdCode::SaveData).raw;
 }
 
 /**
@@ -484,7 +484,7 @@ static void FormatThisUserSaveData(Service::Interface* self) {
 
     // TODO(Subv): Find out what the inputs and outputs of this function are
 
-    cmd_buff[1] = FormatSaveData().raw;
+    cmd_buff[1] = FormatArchive(ArchiveIdCode::SaveData).raw;
 }
 
 static void CreateExtSaveData(Service::Interface* self) {

src/core/hle/service/ptm_u.cpp

@@ -4,8 +4,9 @@
 
 #include "common/log.h"
 #include "common/make_unique.h"
-#include "core/file_sys/archive_extsavedata.h"
+
 #include "core/hle/hle.h"
+#include "core/hle/service/fs/archive.h"
 #include "core/hle/service/ptm_u.h"
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -28,7 +29,6 @@ struct GameCoin {
     u8 day;
 };
 static const GameCoin default_game_coin = { 0x4F00, 42, 0, 0, 0, 2014, 12, 29 };
-static std::unique_ptr<FileSys::Archive_ExtSaveData> ptm_shared_extsavedata;
 static const std::vector<u8> ptm_shared_extdata_id = {0, 0, 0, 0, 0x0B, 0, 0, 0xF0, 0, 0, 0, 0};
 
 /// Charge levels used by PTM functions
@@ -138,31 +138,28 @@ const Interface::FunctionInfo FunctionTable[] = {
 
 Interface::Interface() {
     Register(FunctionTable);
-    // Create the SharedExtSaveData archive 0xF000000B and the gamecoin.dat file
-    // TODO(Subv): In the future we should use the FS service to query this archive
-    std::string nand_directory = FileUtil::GetUserPath(D_NAND_IDX);
-    ptm_shared_extsavedata = Common::make_unique<FileSys::Archive_ExtSaveData>(nand_directory, true);
-    if (!ptm_shared_extsavedata->Initialize()) {
-        LOG_CRITICAL(Service_PTM, "Could not initialize SharedExtSaveData archive for the PTM:U service");
-        return;
-    }
+
+    // Open the SharedExtSaveData archive 0xF000000B and the gamecoin.dat file
     FileSys::Path archive_path(ptm_shared_extdata_id);
-    ResultCode result = ptm_shared_extsavedata->Open(archive_path);
+    auto archive_result = Service::FS::OpenArchive(Service::FS::ArchiveIdCode::SharedExtSaveData, archive_path);
     // If the archive didn't exist, create the files inside
-    if (result.description == ErrorDescription::FS_NotFormatted) {
-        // Format the archive to clear the directories
-        ptm_shared_extsavedata->Format(archive_path);
+    if (archive_result.Code().description == ErrorDescription::FS_NotFormatted) {
+        // Format the archive to create the directories
+        Service::FS::FormatArchive(Service::FS::ArchiveIdCode::SharedExtSaveData, archive_path);
         // Open it again to get a valid archive now that the folder exists
-        ptm_shared_extsavedata->Open(archive_path);
+        archive_result = Service::FS::OpenArchive(Service::FS::ArchiveIdCode::SharedExtSaveData, archive_path);
+        _assert_msg_(Service_PTM, archive_result.Succeeded(), "Could not open the PTM SharedExtSaveData archive!");
+
         FileSys::Path gamecoin_path("gamecoin.dat");
         FileSys::Mode open_mode = {};
         open_mode.write_flag = 1;
         open_mode.create_flag = 1;
         // Open the file and write the default gamecoin information
-        auto gamecoin = ptm_shared_extsavedata->OpenFile(gamecoin_path, open_mode);
-        if (gamecoin != nullptr) {
-            gamecoin->Write(0, sizeof(GameCoin), 1, reinterpret_cast<const u8*>(&default_game_coin));
-            gamecoin->Close();
+        auto gamecoin_result = Service::FS::OpenFileFromArchive(*archive_result, gamecoin_path, open_mode);
+        if (gamecoin_result.Succeeded()) {
+            auto gamecoin = gamecoin_result.MoveFrom();
+            gamecoin->backend->Write(0, sizeof(GameCoin), 1, reinterpret_cast<const u8*>(&default_game_coin));
+            gamecoin->backend->Close();
         }
     }
 }

src/core/loader/loader.cpp

@@ -127,7 +127,7 @@ ResultStatus LoadFile(const std::string& filename) {
         // Load application and RomFS
         if (ResultStatus::Success == app_loader.Load()) {
             Kernel::g_program_id = app_loader.GetProgramId();
-            Service::FS::CreateArchive(Common::make_unique<FileSys::Archive_RomFS>(app_loader), Service::FS::ArchiveIdCode::RomFS);
+            Service::FS::RegisterArchiveType(Common::make_unique<FileSys::ArchiveFactory_RomFS>(app_loader), Service::FS::ArchiveIdCode::RomFS);
             return ResultStatus::Success;
         }
         break;