HLE: Move kernel/archive.* to service/fs/

4 files changed, 1038 insertions, 0 deletions

diff --git a/src/core/hle/service/fs/archive.cpp b/src/core/hle/service/fs/archive.cpp
new file mode 100644
index 00000000..8889c633
--- /dev/null
+++ b/src/core/hle/service/fs/archive.cpp
@@ -0,0 +1,426 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#include <map>
+
+#include "common/common_types.h"
+#include "common/file_util.h"
+#include "common/math_util.h"
+
+#include "core/file_sys/archive.h"
+#include "core/file_sys/archive_sdmc.h"
+#include "core/file_sys/directory.h"
+#include "core/hle/service/fs/archive.h"
+#include "core/hle/kernel/session.h"
+#include "core/hle/result.h"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// Kernel namespace
+
+namespace Kernel {
+
+// Command to access archive file
+enum class FileCommand : u32 {
+    Dummy1          = 0x000100C6,
+    Control         = 0x040100C4,
+    OpenSubFile     = 0x08010100,
+    Read            = 0x080200C2,
+    Write           = 0x08030102,
+    GetSize         = 0x08040000,
+    SetSize         = 0x08050080,
+    GetAttributes   = 0x08060000,
+    SetAttributes   = 0x08070040,
+    Close           = 0x08080000,
+    Flush           = 0x08090000,
+};
+
+// Command to access directory
+enum class DirectoryCommand : u32 {
+    Dummy1          = 0x000100C6,
+    Control         = 0x040100C4,
+    Read            = 0x08010042,
+    Close           = 0x08020000,
+};
+
+class Archive : public Kernel::Session {
+public:
+    std::string GetName() const override { return "Archive: " + name; }
+
+    std::string name;           ///< Name of archive (optional)
+    FileSys::Archive* backend;  ///< Archive backend interface
+
+    ResultVal<bool> SyncRequest() override {
+        u32* cmd_buff = Kernel::GetCommandBuffer();
+        FileCommand cmd = static_cast<FileCommand>(cmd_buff[0]);
+
+        switch (cmd) {
+        // Read from archive...
+        case FileCommand::Read:
+        {
+            u64 offset  = cmd_buff[1] | ((u64)cmd_buff[2] << 32);
+            u32 length  = cmd_buff[3];
+            u32 address = cmd_buff[5];
+
+            // Number of bytes read
+            cmd_buff[2] = backend->Read(offset, length, Memory::GetPointer(address));
+            break;
+        }
+        // Write to archive...
+        case FileCommand::Write:
+        {
+            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];
+
+            // Number of bytes written
+            cmd_buff[2] = backend->Write(offset, length, flush, Memory::GetPointer(address));
+            break;
+        }
+        case FileCommand::GetSize:
+        {
+            u64 filesize = (u64) backend->GetSize();
+            cmd_buff[2]  = (u32) filesize;         // Lower word
+            cmd_buff[3]  = (u32) (filesize >> 32); // Upper word
+            break;
+        }
+        case FileCommand::SetSize:
+        {
+            backend->SetSize(cmd_buff[1] | ((u64)cmd_buff[2] << 32));
+            break;
+        }
+        case FileCommand::Close:
+        {
+            LOG_TRACE(Service_FS, "Close %s %s", GetTypeName().c_str(), GetName().c_str());
+            CloseArchive(backend->GetIdCode());
+            break;
+        }
+        // Unknown command...
+        default:
+        {
+            LOG_ERROR(Service_FS, "Unknown command=0x%08X", cmd);
+            cmd_buff[0] = UnimplementedFunction(ErrorModule::FS).raw;
+            return MakeResult<bool>(false);
+        }
+        }
+        cmd_buff[1] = 0; // No error
+        return MakeResult<bool>(false);
+    }
+};
+
+class File : public Kernel::Session {
+public:
+    std::string GetName() const override { return "Path: " + path.DebugStr(); }
+
+    FileSys::Path path; ///< Path of the file
+    std::unique_ptr<FileSys::File> backend; ///< File backend interface
+
+    ResultVal<bool> SyncRequest() override {
+        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];
+            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);
+            cmd_buff[2] = backend->Read(offset, length, Memory::GetPointer(address));
+            break;
+        }
+
+        // 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];
+            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);
+            cmd_buff[2] = backend->Write(offset, length, flush, Memory::GetPointer(address));
+            break;
+        }
+
+        case FileCommand::GetSize:
+        {
+            LOG_TRACE(Service_FS, "GetSize %s %s", GetTypeName().c_str(), GetName().c_str());
+            u64 size = backend->GetSize();
+            cmd_buff[2] = (u32)size;
+            cmd_buff[3] = size >> 32;
+            break;
+        }
+
+        case FileCommand::SetSize:
+        {
+            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);
+            backend->SetSize(size);
+            break;
+        }
+
+        case FileCommand::Close:
+        {
+            LOG_TRACE(Service_FS, "Close %s %s", GetTypeName().c_str(), GetName().c_str());
+            Kernel::g_object_pool.Destroy<File>(GetHandle());
+            break;
+        }
+
+        // Unknown command...
+        default:
+            LOG_ERROR(Service_FS, "Unknown command=0x%08X!", cmd);
+            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:
+    std::string GetName() const override { return "Directory: " + path.DebugStr(); }
+
+    FileSys::Path path; ///< Path of the directory
+    std::unique_ptr<FileSys::Directory> backend; ///< File backend interface
+
+    ResultVal<bool> SyncRequest() override {
+        u32* cmd_buff = Kernel::GetCommandBuffer();
+        DirectoryCommand cmd = static_cast<DirectoryCommand>(cmd_buff[0]);
+        switch (cmd) {
+
+        // Read from directory...
+        case DirectoryCommand::Read:
+        {
+            u32 count = cmd_buff[1];
+            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);
+
+            // Number of entries actually read
+            cmd_buff[2] = backend->Read(count, entries);
+            break;
+        }
+
+        case DirectoryCommand::Close:
+        {
+            LOG_TRACE(Service_FS, "Close %s %s", GetTypeName().c_str(), GetName().c_str());
+            Kernel::g_object_pool.Destroy<Directory>(GetHandle());
+            break;
+        }
+
+        // Unknown command...
+        default:
+            LOG_ERROR(Service_FS, "Unknown command=0x%08X!", cmd);
+            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);
+    }
+};
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+std::map<FileSys::Archive::IdCode, Handle> g_archive_map; ///< Map of file archives by IdCode
+
+ResultVal<Handle> OpenArchive(FileSys::Archive::IdCode id_code) {
+    auto itr = g_archive_map.find(id_code);
+    if (itr == g_archive_map.end()) {
+        return ResultCode(ErrorDescription::NotFound, ErrorModule::FS,
+                ErrorSummary::NotFound, ErrorLevel::Permanent);
+    }
+
+    return MakeResult<Handle>(itr->second);
+}
+
+ResultCode CloseArchive(FileSys::Archive::IdCode id_code) {
+    auto itr = g_archive_map.find(id_code);
+    if (itr == g_archive_map.end()) {
+        LOG_ERROR(Service_FS, "Cannot close archive %d, does not exist!", (int)id_code);
+        return InvalidHandle(ErrorModule::FS);
+    }
+
+    LOG_TRACE(Service_FS, "Closed archive %d", (int) id_code);
+    return RESULT_SUCCESS;
+}
+
+/**
+ * Mounts an archive
+ * @param archive Pointer to the archive to mount
+ */
+ResultCode MountArchive(Archive* archive) {
+    FileSys::Archive::IdCode id_code = archive->backend->GetIdCode();
+    ResultVal<Handle> archive_handle = OpenArchive(id_code);
+    if (archive_handle.Succeeded()) {
+        LOG_ERROR(Service_FS, "Cannot mount two archives with the same ID code! (%d)", (int) id_code);
+        return archive_handle.Code();
+    }
+    g_archive_map[id_code] = archive->GetHandle();
+    LOG_TRACE(Service_FS, "Mounted archive %s", archive->GetName().c_str());
+    return RESULT_SUCCESS;
+}
+
+ResultCode CreateArchive(FileSys::Archive* backend, const std::string& name) {
+    Archive* archive = new Archive;
+    Handle handle = Kernel::g_object_pool.Create(archive);
+    archive->name = name;
+    archive->backend = backend;
+
+    ResultCode result = MountArchive(archive);
+    if (result.IsError()) {
+        return result;
+    }
+    
+    return RESULT_SUCCESS;
+}
+
+ResultVal<Handle> OpenFileFromArchive(Handle archive_handle, const FileSys::Path& path, const FileSys::Mode mode) {
+    // TODO(bunnei): Binary type files get a raw file pointer to the archive. Currently, we create
+    // the archive file handles at app loading, and then keep them persistent throughout execution.
+    // Archives file handles are just reused and not actually freed until emulation shut down.
+    // Verify if real hardware works this way, or if new handles are created each time
+    if (path.GetType() == FileSys::Binary)
+        // TODO(bunnei): FixMe - this is a hack to compensate for an incorrect FileSys backend
+        // design. While the functionally of this is OK, our implementation decision to separate
+        // normal files from archive file pointers is very likely wrong.
+        // See https://github.com/citra-emu/citra/issues/205
+        return MakeResult<Handle>(archive_handle);
+
+    File* file = new File;
+    Handle handle = Kernel::g_object_pool.Create(file);
+
+    Archive* archive = Kernel::g_object_pool.Get<Archive>(archive_handle);
+    if (archive == nullptr) {
+        return InvalidHandle(ErrorModule::FS);
+    }
+    file->path = path;
+    file->backend = archive->backend->OpenFile(path, mode);
+
+    if (!file->backend) {
+        return ResultCode(ErrorDescription::NotFound, ErrorModule::FS,
+                ErrorSummary::NotFound, ErrorLevel::Permanent);
+    }
+
+    return MakeResult<Handle>(handle);
+}
+
+ResultCode DeleteFileFromArchive(Handle archive_handle, const FileSys::Path& path) {
+    Archive* archive = Kernel::g_object_pool.GetFast<Archive>(archive_handle);
+    if (archive == nullptr)
+        return InvalidHandle(ErrorModule::FS);
+    if (archive->backend->DeleteFile(path))
+        return RESULT_SUCCESS;
+    return ResultCode(ErrorDescription::NoData, ErrorModule::FS, // TODO: verify description
+                      ErrorSummary::Canceled, ErrorLevel::Status);
+}
+
+ResultCode RenameFileBetweenArchives(Handle src_archive_handle, const FileSys::Path& src_path,
+                                     Handle dest_archive_handle, const FileSys::Path& dest_path) {
+    Archive* src_archive = Kernel::g_object_pool.GetFast<Archive>(src_archive_handle);
+    Archive* dest_archive = Kernel::g_object_pool.GetFast<Archive>(dest_archive_handle);
+    if (src_archive == nullptr || dest_archive == nullptr)
+        return InvalidHandle(ErrorModule::FS);
+    if (src_archive == dest_archive) {
+        if (src_archive->backend->RenameFile(src_path, dest_path))
+            return RESULT_SUCCESS;
+    } else {
+        // TODO: Implement renaming across archives
+        return UnimplementedFunction(ErrorModule::FS);
+    }
+    return ResultCode(ErrorDescription::NoData, ErrorModule::FS, // TODO: verify description
+                      ErrorSummary::NothingHappened, ErrorLevel::Status);
+}
+
+ResultCode DeleteDirectoryFromArchive(Handle archive_handle, const FileSys::Path& path) {
+    Archive* archive = Kernel::g_object_pool.GetFast<Archive>(archive_handle);
+    if (archive == nullptr)
+        return InvalidHandle(ErrorModule::FS);
+    if (archive->backend->DeleteDirectory(path))
+        return RESULT_SUCCESS;
+    return ResultCode(ErrorDescription::NoData, ErrorModule::FS, // TODO: verify description
+                      ErrorSummary::Canceled, ErrorLevel::Status);
+}
+
+ResultCode CreateDirectoryFromArchive(Handle archive_handle, const FileSys::Path& path) {
+    Archive* archive = Kernel::g_object_pool.GetFast<Archive>(archive_handle);
+    if (archive == nullptr)
+        return InvalidHandle(ErrorModule::FS);
+    if (archive->backend->CreateDirectory(path))
+        return RESULT_SUCCESS;
+    return ResultCode(ErrorDescription::NoData, ErrorModule::FS, // TODO: verify description
+                      ErrorSummary::Canceled, ErrorLevel::Status);
+}
+
+ResultCode RenameDirectoryBetweenArchives(Handle src_archive_handle, const FileSys::Path& src_path,
+                                          Handle dest_archive_handle, const FileSys::Path& dest_path) {
+    Archive* src_archive = Kernel::g_object_pool.GetFast<Archive>(src_archive_handle);
+    Archive* dest_archive = Kernel::g_object_pool.GetFast<Archive>(dest_archive_handle);
+    if (src_archive == nullptr || dest_archive == nullptr)
+        return InvalidHandle(ErrorModule::FS);
+    if (src_archive == dest_archive) {
+        if (src_archive->backend->RenameDirectory(src_path, dest_path))
+            return RESULT_SUCCESS;
+    } else {
+        // TODO: Implement renaming across archives
+        return UnimplementedFunction(ErrorModule::FS);
+    }
+    return ResultCode(ErrorDescription::NoData, ErrorModule::FS, // TODO: verify description
+                      ErrorSummary::NothingHappened, ErrorLevel::Status);
+}
+
+/**
+ * Open a Directory from an Archive
+ * @param archive_handle Handle to an open Archive object
+ * @param path Path to the Directory inside of the Archive
+ * @return Opened Directory object
+ */
+ResultVal<Handle> OpenDirectoryFromArchive(Handle archive_handle, const FileSys::Path& path) {
+    Directory* directory = new Directory;
+    Handle handle = Kernel::g_object_pool.Create(directory);
+
+    Archive* archive = Kernel::g_object_pool.Get<Archive>(archive_handle);
+    if (archive == nullptr) {
+        return InvalidHandle(ErrorModule::FS);
+    }
+    directory->path = path;
+    directory->backend = archive->backend->OpenDirectory(path);
+
+    if (!directory->backend) {
+        return ResultCode(ErrorDescription::NotFound, ErrorModule::FS,
+                          ErrorSummary::NotFound, ErrorLevel::Permanent);
+    }
+
+    return MakeResult<Handle>(handle);
+}
+
+/// Initialize archives
+void ArchiveInit() {
+    g_archive_map.clear();
+
+    // TODO(Link Mauve): Add the other archive types (see here for the known types:
+    // http://3dbrew.org/wiki/FS:OpenArchive#Archive_idcodes).  Currently the only half-finished
+    // archive type is SDMC, so it is the only one getting exposed.
+
+    std::string sdmc_directory = FileUtil::GetUserPath(D_SDMC_IDX);
+    auto archive = new FileSys::Archive_SDMC(sdmc_directory);
+    if (archive->Initialize())
+        CreateArchive(archive, "SDMC");
+    else
+        LOG_ERROR(Service_FS, "Can't instantiate SDMC archive with path %s", sdmc_directory.c_str());
+}
+
+/// Shutdown archives
+void ArchiveShutdown() {
+    g_archive_map.clear();
+}
+
+} // namespace Kernel
diff --git a/src/core/hle/service/fs/archive.h b/src/core/hle/service/fs/archive.h
new file mode 100644
index 00000000..b50833a2
--- /dev/null
+++ b/src/core/hle/service/fs/archive.h
@@ -0,0 +1,107 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "common/common_types.h"
+
+#include "core/file_sys/archive.h"
+#include "core/hle/kernel/kernel.h"
+#include "core/hle/result.h"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// Kernel namespace
+
+namespace Kernel {
+
+/**
+ * Opens an archive
+ * @param id_code IdCode of the archive to open
+ * @return Handle to the opened archive
+ */
+ResultVal<Handle> OpenArchive(FileSys::Archive::IdCode id_code);
+
+/**
+ * Closes an archive
+ * @param id_code IdCode of the archive to open
+ */
+ResultCode CloseArchive(FileSys::Archive::IdCode id_code);
+
+/**
+ * Creates an Archive
+ * @param backend File system backend interface to the archive
+ * @param name Name of Archive
+ */
+ResultCode CreateArchive(FileSys::Archive* backend, const std::string& name);
+
+/**
+ * Open a File from an Archive
+ * @param archive_handle Handle to an open Archive object
+ * @param path Path to the File inside of the Archive
+ * @param mode Mode under which to open the File
+ * @return Handle to the opened File object
+ */
+ResultVal<Handle> OpenFileFromArchive(Handle archive_handle, const FileSys::Path& path, const FileSys::Mode mode);
+
+/**
+ * Delete a File from an Archive
+ * @param archive_handle Handle to an open Archive object
+ * @param path Path to the File inside of the Archive
+ * @return Whether deletion succeeded
+ */
+ResultCode DeleteFileFromArchive(Handle archive_handle, const FileSys::Path& path);
+
+/**
+ * Rename a File between two Archives
+ * @param src_archive_handle Handle to the source Archive object
+ * @param src_path Path to the File inside of the source Archive
+ * @param dest_archive_handle Handle to the destination Archive object
+ * @param dest_path Path to the File inside of the destination Archive
+ * @return Whether rename succeeded
+ */
+ResultCode RenameFileBetweenArchives(Handle src_archive_handle, const FileSys::Path& src_path,
+                                     Handle dest_archive_handle, const FileSys::Path& dest_path);
+
+/**
+ * Delete a Directory from an Archive
+ * @param archive_handle Handle to an open Archive object
+ * @param path Path to the Directory inside of the Archive
+ * @return Whether deletion succeeded
+ */
+ResultCode DeleteDirectoryFromArchive(Handle archive_handle, const FileSys::Path& path);
+
+/**
+ * Create a Directory from an Archive
+ * @param archive_handle Handle to an open Archive object
+ * @param path Path to the Directory inside of the Archive
+ * @return Whether creation of directory succeeded
+ */
+ResultCode CreateDirectoryFromArchive(Handle archive_handle, const FileSys::Path& path);
+
+/**
+ * Rename a Directory between two Archives
+ * @param src_archive_handle Handle to the source Archive object
+ * @param src_path Path to the Directory inside of the source Archive
+ * @param dest_archive_handle Handle to the destination Archive object
+ * @param dest_path Path to the Directory inside of the destination Archive
+ * @return Whether rename succeeded
+ */
+ResultCode RenameDirectoryBetweenArchives(Handle src_archive_handle, const FileSys::Path& src_path,
+                                          Handle dest_archive_handle, const FileSys::Path& dest_path);
+
+/**
+ * Open a Directory from an Archive
+ * @param archive_handle Handle to an open Archive object
+ * @param path Path to the Directory inside of the Archive
+ * @return Handle to the opened File object
+ */
+ResultVal<Handle> OpenDirectoryFromArchive(Handle archive_handle, const FileSys::Path& path);
+
+/// Initialize archives
+void ArchiveInit();
+
+/// Shutdown archives
+void ArchiveShutdown();
+
+} // namespace FileSys
diff --git a/src/core/hle/service/fs/fs_user.cpp b/src/core/hle/service/fs/fs_user.cpp
new file mode 100644
index 00000000..c61b283c
--- /dev/null
+++ b/src/core/hle/service/fs/fs_user.cpp
@@ -0,0 +1,474 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#include "common/common.h"
+
+#include "common/string_util.h"
+#include "core/hle/service/fs/archive.h"
+#include "core/hle/result.h"
+#include "core/hle/service/fs/fs_user.h"
+#include "core/settings.h"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// Namespace FS_User
+
+namespace FS_User {
+
+static void Initialize(Service::Interface* self) {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+
+    // TODO(Link Mauve): check the behavior when cmd_buff[1] isn't 32, as per
+    // http://3dbrew.org/wiki/FS:Initialize#Request
+    cmd_buff[1] = RESULT_SUCCESS.raw;
+
+    LOG_DEBUG(Service_FS, "called");
+}
+
+/**
+ * FS_User::OpenFile service function
+ *  Inputs:
+ *      1 : Transaction
+ *      2 : Archive handle lower word
+ *      3 : Archive handle upper word
+ *      4 : Low path type
+ *      5 : Low path size
+ *      6 : Open flags
+ *      7 : Attributes
+ *      8 : (LowPathSize << 14) | 2
+ *      9 : Low path data pointer
+ *  Outputs:
+ *      1 : Result of function, 0 on success, otherwise error code
+ *      3 : File handle
+ */
+static void OpenFile(Service::Interface* self) {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+
+    // TODO(Link Mauve): cmd_buff[2], aka archive handle lower word, isn't used according to
+    // 3dmoo's or ctrulib's implementations.  Triple check if it's really the case.
+    Handle archive_handle = static_cast<Handle>(cmd_buff[3]);
+    auto filename_type    = static_cast<FileSys::LowPathType>(cmd_buff[4]);
+    u32 filename_size     = cmd_buff[5];
+    FileSys::Mode mode; mode.hex = cmd_buff[6];
+    u32 attributes        = cmd_buff[7]; // TODO(Link Mauve): do something with those attributes.
+    u32 filename_ptr      = cmd_buff[9];
+    FileSys::Path file_path(filename_type, filename_size, filename_ptr);
+
+    LOG_DEBUG(Service_FS, "path=%s, mode=%d attrs=%u", file_path.DebugStr().c_str(), mode.hex, attributes);
+
+    ResultVal<Handle> handle = Kernel::OpenFileFromArchive(archive_handle, file_path, mode);
+    cmd_buff[1] = handle.Code().raw;
+    if (handle.Succeeded()) {
+        cmd_buff[3] = *handle;
+    } else {
+        LOG_ERROR(Service_FS, "failed to get a handle for file %s", file_path.DebugStr().c_str());
+    }
+}
+
+/**
+ * FS_User::OpenFileDirectly service function
+ *  Inputs:
+ *      1 : Transaction
+ *      2 : Archive ID
+ *      3 : Archive low path type
+ *      4 : Archive low path size
+ *      5 : File low path type
+ *      6 : File low path size
+ *      7 : Flags
+ *      8 : Attributes
+ *      9 : (ArchiveLowPathSize << 14) | 0x802
+ *      10 : Archive low path
+ *      11 : (FileLowPathSize << 14) | 2
+ *      12 : File low path
+ *  Outputs:
+ *      1 : Result of function, 0 on success, otherwise error code
+ *      3 : File handle
+ */
+static void OpenFileDirectly(Service::Interface* self) {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+
+    auto archive_id       = static_cast<FileSys::Archive::IdCode>(cmd_buff[2]);
+    auto archivename_type = static_cast<FileSys::LowPathType>(cmd_buff[3]);
+    u32 archivename_size  = cmd_buff[4];
+    auto filename_type    = static_cast<FileSys::LowPathType>(cmd_buff[5]);
+    u32 filename_size     = cmd_buff[6];
+    FileSys::Mode mode; mode.hex = cmd_buff[7];
+    u32 attributes        = cmd_buff[8]; // TODO(Link Mauve): do something with those attributes.
+    u32 archivename_ptr   = cmd_buff[10];
+    u32 filename_ptr      = cmd_buff[12];
+    FileSys::Path archive_path(archivename_type, archivename_size, archivename_ptr);
+    FileSys::Path file_path(filename_type, filename_size, filename_ptr);
+
+    LOG_DEBUG(Service_FS, "archive_path=%s file_path=%s, mode=%u attributes=%d",
+              archive_path.DebugStr().c_str(), file_path.DebugStr().c_str(), mode.hex, attributes);
+
+    if (archive_path.GetType() != FileSys::Empty) {
+        LOG_ERROR(Service_FS, "archive LowPath type other than empty is currently unsupported");
+        cmd_buff[1] = UnimplementedFunction(ErrorModule::FS).raw;
+        return;
+    }
+
+    // TODO(Link Mauve): Check if we should even get a handle for the archive, and don't leak it
+    // TODO(yuriks): Why is there all this duplicate (and seemingly useless) code up here?
+    ResultVal<Handle> archive_handle = Kernel::OpenArchive(archive_id);
+    cmd_buff[1] = archive_handle.Code().raw;
+    if (archive_handle.Failed()) {
+        LOG_ERROR(Service_FS, "failed to get a handle for archive");
+        return;
+    }
+    // cmd_buff[2] isn't used according to 3dmoo's implementation.
+    cmd_buff[3] = *archive_handle;
+
+    ResultVal<Handle> handle = Kernel::OpenFileFromArchive(*archive_handle, file_path, mode);
+    cmd_buff[1] = handle.Code().raw;
+    if (handle.Succeeded()) {
+        cmd_buff[3] = *handle;
+    } else {
+        LOG_ERROR(Service_FS, "failed to get a handle for file %s", file_path.DebugStr().c_str());
+    }
+}
+
+/*
+ * FS_User::DeleteFile service function
+ *  Inputs:
+ *      2 : Archive handle lower word
+ *      3 : Archive handle upper word
+ *      4 : File path string type
+ *      5 : File path string size
+ *      7 : File path string data
+ *  Outputs:
+ *      1 : Result of function, 0 on success, otherwise error code
+ */
+void DeleteFile(Service::Interface* self) {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+
+    // TODO(Link Mauve): cmd_buff[2], aka archive handle lower word, isn't used according to
+    // 3dmoo's or ctrulib's implementations.  Triple check if it's really the case.
+    Handle archive_handle = static_cast<Handle>(cmd_buff[3]);
+    auto filename_type    = static_cast<FileSys::LowPathType>(cmd_buff[4]);
+    u32 filename_size     = cmd_buff[5];
+    u32 filename_ptr      = cmd_buff[7];
+
+    FileSys::Path file_path(filename_type, filename_size, filename_ptr);
+
+    LOG_DEBUG(Service_FS, "type=%d size=%d data=%s",
+              filename_type, filename_size, file_path.DebugStr().c_str());
+
+    cmd_buff[1] = Kernel::DeleteFileFromArchive(archive_handle, file_path).raw;
+}
+
+/*
+ * FS_User::RenameFile service function
+ *  Inputs:
+ *      2 : Source archive handle lower word
+ *      3 : Source archive handle upper word
+ *      4 : Source file path type
+ *      5 : Source file path size
+ *      6 : Dest archive handle lower word
+ *      7 : Dest archive handle upper word
+ *      8 : Dest file path type
+ *      9 : Dest file path size
+ *      11: Source file path string data
+ *      13: Dest file path string
+ *  Outputs:
+ *      1 : Result of function, 0 on success, otherwise error code
+ */
+void RenameFile(Service::Interface* self) {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+
+    // TODO(Link Mauve): cmd_buff[2] and cmd_buff[6], aka archive handle lower word, aren't used according to
+    // 3dmoo's or ctrulib's implementations.  Triple check if it's really the case.
+    Handle src_archive_handle  = static_cast<Handle>(cmd_buff[3]);
+    auto src_filename_type     = static_cast<FileSys::LowPathType>(cmd_buff[4]);
+    u32 src_filename_size      = cmd_buff[5];
+    Handle dest_archive_handle = static_cast<Handle>(cmd_buff[7]);
+    auto dest_filename_type    = static_cast<FileSys::LowPathType>(cmd_buff[8]);
+    u32 dest_filename_size     = cmd_buff[9];
+    u32 src_filename_ptr       = cmd_buff[11];
+    u32 dest_filename_ptr      = cmd_buff[13];
+
+    FileSys::Path src_file_path(src_filename_type, src_filename_size, src_filename_ptr);
+    FileSys::Path dest_file_path(dest_filename_type, dest_filename_size, dest_filename_ptr);
+
+    LOG_DEBUG(Service_FS, "src_type=%d src_size=%d src_data=%s dest_type=%d dest_size=%d dest_data=%s",
+              src_filename_type, src_filename_size, src_file_path.DebugStr().c_str(),
+              dest_filename_type, dest_filename_size, dest_file_path.DebugStr().c_str());
+
+    cmd_buff[1] = Kernel::RenameFileBetweenArchives(src_archive_handle, src_file_path, dest_archive_handle, dest_file_path).raw;
+}
+
+/*
+ * FS_User::DeleteDirectory service function
+ *  Inputs:
+ *      2 : Archive handle lower word
+ *      3 : Archive handle upper word
+ *      4 : Directory path string type
+ *      5 : Directory path string size
+ *      7 : Directory path string data
+ *  Outputs:
+ *      1 : Result of function, 0 on success, otherwise error code
+ */
+void DeleteDirectory(Service::Interface* self) {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+
+    // TODO(Link Mauve): cmd_buff[2], aka archive handle lower word, isn't used according to
+    // 3dmoo's or ctrulib's implementations.  Triple check if it's really the case.
+    Handle archive_handle = static_cast<Handle>(cmd_buff[3]);
+    auto dirname_type     = static_cast<FileSys::LowPathType>(cmd_buff[4]);
+    u32 dirname_size      = cmd_buff[5];
+    u32 dirname_ptr       = cmd_buff[7];
+
+    FileSys::Path dir_path(dirname_type, dirname_size, dirname_ptr);
+
+    LOG_DEBUG(Service_FS, "type=%d size=%d data=%s",
+              dirname_type, dirname_size, dir_path.DebugStr().c_str());
+    
+    cmd_buff[1] = Kernel::DeleteDirectoryFromArchive(archive_handle, dir_path).raw;
+}
+
+/*
+ * FS_User::CreateDirectory service function
+ *  Inputs:
+ *      2 : Archive handle lower word
+ *      3 : Archive handle upper word
+ *      4 : Directory path string type
+ *      5 : Directory path string size
+ *      8 : Directory path string data
+ *  Outputs:
+ *      1 : Result of function, 0 on success, otherwise error code
+ */
+static void CreateDirectory(Service::Interface* self) {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+
+    // TODO: cmd_buff[2], aka archive handle lower word, isn't used according to
+    // 3dmoo's or ctrulib's implementations.  Triple check if it's really the case.
+    Handle archive_handle = static_cast<Handle>(cmd_buff[3]);
+    auto dirname_type = static_cast<FileSys::LowPathType>(cmd_buff[4]);
+    u32 dirname_size = cmd_buff[5];
+    u32 dirname_ptr = cmd_buff[8];
+
+    FileSys::Path dir_path(dirname_type, dirname_size, dirname_ptr);
+
+    LOG_DEBUG(Service_FS, "type=%d size=%d data=%s", dirname_type, dirname_size, dir_path.DebugStr().c_str());
+
+    cmd_buff[1] = Kernel::CreateDirectoryFromArchive(archive_handle, dir_path).raw;
+}
+
+/*
+ * FS_User::RenameDirectory service function
+ *  Inputs:
+ *      2 : Source archive handle lower word
+ *      3 : Source archive handle upper word
+ *      4 : Source dir path type
+ *      5 : Source dir path size
+ *      6 : Dest archive handle lower word
+ *      7 : Dest archive handle upper word
+ *      8 : Dest dir path type
+ *      9 : Dest dir path size
+ *      11: Source dir path string data
+ *      13: Dest dir path string
+ *  Outputs:
+ *      1 : Result of function, 0 on success, otherwise error code
+ */
+void RenameDirectory(Service::Interface* self) {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+
+    // TODO(Link Mauve): cmd_buff[2] and cmd_buff[6], aka archive handle lower word, aren't used according to
+    // 3dmoo's or ctrulib's implementations.  Triple check if it's really the case.
+    Handle src_archive_handle  = static_cast<Handle>(cmd_buff[3]);
+    auto src_dirname_type      = static_cast<FileSys::LowPathType>(cmd_buff[4]);
+    u32 src_dirname_size       = cmd_buff[5];
+    Handle dest_archive_handle = static_cast<Handle>(cmd_buff[7]);
+    auto dest_dirname_type     = static_cast<FileSys::LowPathType>(cmd_buff[8]);
+    u32 dest_dirname_size      = cmd_buff[9];
+    u32 src_dirname_ptr        = cmd_buff[11];
+    u32 dest_dirname_ptr       = cmd_buff[13];
+
+    FileSys::Path src_dir_path(src_dirname_type, src_dirname_size, src_dirname_ptr);
+    FileSys::Path dest_dir_path(dest_dirname_type, dest_dirname_size, dest_dirname_ptr);
+
+    LOG_DEBUG(Service_FS, "src_type=%d src_size=%d src_data=%s dest_type=%d dest_size=%d dest_data=%s",
+              src_dirname_type, src_dirname_size, src_dir_path.DebugStr().c_str(),
+              dest_dirname_type, dest_dirname_size, dest_dir_path.DebugStr().c_str());
+
+    cmd_buff[1] = Kernel::RenameDirectoryBetweenArchives(src_archive_handle, src_dir_path, dest_archive_handle, dest_dir_path).raw;
+}
+
+static void OpenDirectory(Service::Interface* self) {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+
+    // TODO(Link Mauve): cmd_buff[2], aka archive handle lower word, isn't used according to
+    // 3dmoo's or ctrulib's implementations.  Triple check if it's really the case.
+    Handle archive_handle = static_cast<Handle>(cmd_buff[2]);
+    auto dirname_type = static_cast<FileSys::LowPathType>(cmd_buff[3]);
+    u32 dirname_size = cmd_buff[4];
+    u32 dirname_ptr = cmd_buff[6];
+
+    FileSys::Path dir_path(dirname_type, dirname_size, dirname_ptr);
+
+    LOG_DEBUG(Service_FS, "type=%d size=%d data=%s", dirname_type, dirname_size, dir_path.DebugStr().c_str());
+
+    ResultVal<Handle> handle = Kernel::OpenDirectoryFromArchive(archive_handle, dir_path);
+    cmd_buff[1] = handle.Code().raw;
+    if (handle.Succeeded()) {
+        cmd_buff[3] = *handle;
+    } else {
+        LOG_ERROR(Service_FS, "failed to get a handle for directory");
+    }
+}
+
+/**
+ * FS_User::OpenArchive service function
+ *  Inputs:
+ *      1 : Archive ID
+ *      2 : Archive low path type
+ *      3 : Archive low path size
+ *      4 : (LowPathSize << 14) | 2
+ *      5 : Archive low path
+ *  Outputs:
+ *      1 : Result of function, 0 on success, otherwise error code
+ *      2 : Archive handle lower word (unused)
+ *      3 : Archive handle upper word (same as file handle)
+ */
+static void OpenArchive(Service::Interface* self) {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+
+    auto archive_id       = static_cast<FileSys::Archive::IdCode>(cmd_buff[1]);
+    auto archivename_type = static_cast<FileSys::LowPathType>(cmd_buff[2]);
+    u32 archivename_size  = cmd_buff[3];
+    u32 archivename_ptr   = cmd_buff[5];
+    FileSys::Path archive_path(archivename_type, archivename_size, archivename_ptr);
+
+    LOG_DEBUG(Service_FS, "archive_path=%s", archive_path.DebugStr().c_str());
+
+    if (archive_path.GetType() != FileSys::Empty) {
+        LOG_ERROR(Service_FS, "archive LowPath type other than empty is currently unsupported");
+        cmd_buff[1] = UnimplementedFunction(ErrorModule::FS).raw;
+        return;
+    }
+
+    ResultVal<Handle> handle = Kernel::OpenArchive(archive_id);
+    cmd_buff[1] = handle.Code().raw;
+    if (handle.Succeeded()) {
+        // cmd_buff[2] isn't used according to 3dmoo's implementation.
+        cmd_buff[3] = *handle;
+    } else {
+        LOG_ERROR(Service_FS, "failed to get a handle for archive");
+    }
+}
+
+/*
+* FS_User::IsSdmcDetected service function
+*  Outputs:
+*      1 : Result of function, 0 on success, otherwise error code
+*      2 : Whether the Sdmc could be detected
+*/
+static void IsSdmcDetected(Service::Interface* self) {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+
+    cmd_buff[1] = 0;
+    cmd_buff[2] = Settings::values.use_virtual_sd ? 1 : 0;
+
+    LOG_DEBUG(Service_FS, "called");
+}
+
+const Interface::FunctionInfo FunctionTable[] = {
+    {0x000100C6, nullptr,               "Dummy1"},
+    {0x040100C4, nullptr,               "Control"},
+    {0x08010002, Initialize,            "Initialize"},
+    {0x080201C2, OpenFile,              "OpenFile"},
+    {0x08030204, OpenFileDirectly,      "OpenFileDirectly"},
+    {0x08040142, DeleteFile,            "DeleteFile"},
+    {0x08050244, RenameFile,            "RenameFile"},
+    {0x08060142, DeleteDirectory,       "DeleteDirectory"},
+    {0x08070142, nullptr,               "DeleteDirectoryRecursively"},
+    {0x08080202, nullptr,               "CreateFile"},
+    {0x08090182, CreateDirectory,       "CreateDirectory"},
+    {0x080A0244, RenameDirectory,       "RenameDirectory"},
+    {0x080B0102, OpenDirectory,         "OpenDirectory"},
+    {0x080C00C2, OpenArchive,           "OpenArchive"},
+    {0x080D0144, nullptr,               "ControlArchive"},
+    {0x080E0080, nullptr,               "CloseArchive"},
+    {0x080F0180, nullptr,               "FormatThisUserSaveData"},
+    {0x08100200, nullptr,               "CreateSystemSaveData"},
+    {0x08110040, nullptr,               "DeleteSystemSaveData"},
+    {0x08120080, nullptr,               "GetFreeBytes"},
+    {0x08130000, nullptr,               "GetCardType"},
+    {0x08140000, nullptr,               "GetSdmcArchiveResource"},
+    {0x08150000, nullptr,               "GetNandArchiveResource"},
+    {0x08160000, nullptr,               "GetSdmcFatfsErro"},
+    {0x08170000, IsSdmcDetected,        "IsSdmcDetected"},
+    {0x08180000, nullptr,               "IsSdmcWritable"},
+    {0x08190042, nullptr,               "GetSdmcCid"},
+    {0x081A0042, nullptr,               "GetNandCid"},
+    {0x081B0000, nullptr,               "GetSdmcSpeedInfo"},
+    {0x081C0000, nullptr,               "GetNandSpeedInfo"},
+    {0x081D0042, nullptr,               "GetSdmcLog"},
+    {0x081E0042, nullptr,               "GetNandLog"},
+    {0x081F0000, nullptr,               "ClearSdmcLog"},
+    {0x08200000, nullptr,               "ClearNandLog"},
+    {0x08210000, nullptr,               "CardSlotIsInserted"},
+    {0x08220000, nullptr,               "CardSlotPowerOn"},
+    {0x08230000, nullptr,               "CardSlotPowerOff"},
+    {0x08240000, nullptr,               "CardSlotGetCardIFPowerStatus"},
+    {0x08250040, nullptr,               "CardNorDirectCommand"},
+    {0x08260080, nullptr,               "CardNorDirectCommandWithAddress"},
+    {0x08270082, nullptr,               "CardNorDirectRead"},
+    {0x082800C2, nullptr,               "CardNorDirectReadWithAddress"},
+    {0x08290082, nullptr,               "CardNorDirectWrite"},
+    {0x082A00C2, nullptr,               "CardNorDirectWriteWithAddress"},
+    {0x082B00C2, nullptr,               "CardNorDirectRead_4xIO"},
+    {0x082C0082, nullptr,               "CardNorDirectCpuWriteWithoutVerify"},
+    {0x082D0040, nullptr,               "CardNorDirectSectorEraseWithoutVerify"},
+    {0x082E0040, nullptr,               "GetProductInfo"},
+    {0x082F0040, nullptr,               "GetProgramLaunchInfo"},
+    {0x08300182, nullptr,               "CreateExtSaveData"},
+    {0x08310180, nullptr,               "CreateSharedExtSaveData"},
+    {0x08320102, nullptr,               "ReadExtSaveDataIcon"},
+    {0x08330082, nullptr,               "EnumerateExtSaveData"},
+    {0x08340082, nullptr,               "EnumerateSharedExtSaveData"},
+    {0x08350080, nullptr,               "DeleteExtSaveData"},
+    {0x08360080, nullptr,               "DeleteSharedExtSaveData"},
+    {0x08370040, nullptr,               "SetCardSpiBaudRate"},
+    {0x08380040, nullptr,               "SetCardSpiBusMode"},
+    {0x08390000, nullptr,               "SendInitializeInfoTo9"},
+    {0x083A0100, nullptr,               "GetSpecialContentIndex"},
+    {0x083B00C2, nullptr,               "GetLegacyRomHeader"},
+    {0x083C00C2, nullptr,               "GetLegacyBannerData"},
+    {0x083D0100, nullptr,               "CheckAuthorityToAccessExtSaveData"},
+    {0x083E00C2, nullptr,               "QueryTotalQuotaSize"},
+    {0x083F00C0, nullptr,               "GetExtDataBlockSize"},
+    {0x08400040, nullptr,               "AbnegateAccessRight"},
+    {0x08410000, nullptr,               "DeleteSdmcRoot"},
+    {0x08420040, nullptr,               "DeleteAllExtSaveDataOnNand"},
+    {0x08430000, nullptr,               "InitializeCtrFileSystem"},
+    {0x08440000, nullptr,               "CreateSeed"},
+    {0x084500C2, nullptr,               "GetFormatInfo"},
+    {0x08460102, nullptr,               "GetLegacyRomHeader2"},
+    {0x08470180, nullptr,               "FormatCtrCardUserSaveData"},
+    {0x08480042, nullptr,               "GetSdmcCtrRootPath"},
+    {0x08490040, nullptr,               "GetArchiveResource"},
+    {0x084A0002, nullptr,               "ExportIntegrityVerificationSeed"},
+    {0x084B0002, nullptr,               "ImportIntegrityVerificationSeed"},
+    {0x084C0242, nullptr,               "FormatSaveData"},
+    {0x084D0102, nullptr,               "GetLegacySubBannerData"},
+    {0x084E0342, nullptr,               "UpdateSha256Context"},
+    {0x084F0102, nullptr,               "ReadSpecialFile"},
+    {0x08500040, nullptr,               "GetSpecialFileSize"},
+    {0x08580000, nullptr,               "GetMovableSedHashedKeyYRandomData"},
+    {0x08610042, nullptr,               "InitializeWithSdkVersion"},
+    {0x08620040, nullptr,               "SetPriority"},
+    {0x08630000, nullptr,               "GetPriority"},
+};
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// Interface class
+
+Interface::Interface() {
+    Register(FunctionTable, ARRAY_SIZE(FunctionTable));
+}
+
+Interface::~Interface() {
+}
+
+} // namespace
diff --git a/src/core/hle/service/fs/fs_user.h b/src/core/hle/service/fs/fs_user.h
new file mode 100644
index 00000000..00538254
--- /dev/null
+++ b/src/core/hle/service/fs/fs_user.h
@@ -0,0 +1,31 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "core/hle/service/service.h"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// Namespace FS_User
+
+namespace FS_User {
+
+/// Interface to "fs:USER" service
+class Interface : public Service::Interface {
+public:
+
+    Interface();
+
+    ~Interface();
+
+    /**
+     * Gets the string port name used by CTROS for the service
+     * @return Port name of service
+     */
+    std::string GetPortName() const override {
+        return "fs:USER";
+    }
+};
+
+} // namespace