6 files changed, 140 insertions, 0 deletions

diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index 63a402ad0..1ecd1c431 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -21,6 +21,7 @@ set(SRCS
             file_sys/archive_savedata.cpp
             file_sys/archive_savedatacheck.cpp
             file_sys/archive_sdmc.cpp
+            file_sys/archive_sdmcwriteonly.cpp
             file_sys/archive_systemsavedata.cpp
             file_sys/disk_archive.cpp
             file_sys/ivfc_archive.cpp
@@ -165,6 +166,7 @@ set(HEADERS
             file_sys/archive_savedata.h
             file_sys/archive_savedatacheck.h
             file_sys/archive_sdmc.h
+            file_sys/archive_sdmcwriteonly.h
             file_sys/archive_systemsavedata.h
             file_sys/directory_backend.h
             file_sys/disk_archive.h
diff --git a/src/core/file_sys/archive_sdmcwriteonly.cpp b/src/core/file_sys/archive_sdmcwriteonly.cpp
new file mode 100644
index 000000000..64ae49b86
--- /dev/null
+++ b/src/core/file_sys/archive_sdmcwriteonly.cpp
@@ -0,0 +1,70 @@
+// Copyright 2016 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <memory>
+#include "common/file_util.h"
+#include "core/file_sys/archive_sdmcwriteonly.h"
+#include "core/file_sys/directory_backend.h"
+#include "core/file_sys/errors.h"
+#include "core/file_sys/file_backend.h"
+#include "core/settings.h"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// FileSys namespace
+
+namespace FileSys {
+
+ResultVal<std::unique_ptr<FileBackend>> SDMCWriteOnlyArchive::OpenFile(const Path& path,
+                                                                       const Mode& mode) const {
+    if (mode.read_flag) {
+        LOG_ERROR(Service_FS, "Read flag is not supported");
+        return ERROR_INVALID_READ_FLAG;
+    }
+    return SDMCArchive::OpenFile(path, mode);
+}
+
+ResultVal<std::unique_ptr<DirectoryBackend>> SDMCWriteOnlyArchive::OpenDirectory(
+    const Path& path) const {
+    LOG_ERROR(Service_FS, "Not supported");
+    return ERROR_UNSUPPORTED_OPEN_FLAGS;
+}
+
+ArchiveFactory_SDMCWriteOnly::ArchiveFactory_SDMCWriteOnly(const std::string& mount_point)
+    : sdmc_directory(mount_point) {
+    LOG_INFO(Service_FS, "Directory %s set as SDMCWriteOnly.", sdmc_directory.c_str());
+}
+
+bool ArchiveFactory_SDMCWriteOnly::Initialize() {
+    if (!Settings::values.use_virtual_sd) {
+        LOG_WARNING(Service_FS, "SDMC disabled by config.");
+        return false;
+    }
+
+    if (!FileUtil::CreateFullPath(sdmc_directory)) {
+        LOG_ERROR(Service_FS, "Unable to create SDMC path.");
+        return false;
+    }
+
+    return true;
+}
+
+ResultVal<std::unique_ptr<ArchiveBackend>> ArchiveFactory_SDMCWriteOnly::Open(const Path& path) {
+    auto archive = std::make_unique<SDMCWriteOnlyArchive>(sdmc_directory);
+    return MakeResult<std::unique_ptr<ArchiveBackend>>(std::move(archive));
+}
+
+ResultCode ArchiveFactory_SDMCWriteOnly::Format(const Path& path,
+                                                const FileSys::ArchiveFormatInfo& format_info) {
+    // TODO(wwylele): hwtest this
+    LOG_ERROR(Service_FS, "Attempted to format a SDMC write-only archive.");
+    return ResultCode(-1);
+}
+
+ResultVal<ArchiveFormatInfo> ArchiveFactory_SDMCWriteOnly::GetFormatInfo(const Path& path) const {
+    // TODO(Subv): Implement
+    LOG_ERROR(Service_FS, "Unimplemented GetFormatInfo archive %s", GetName().c_str());
+    return ResultCode(-1);
+}
+
+} // namespace FileSys
diff --git a/src/core/file_sys/archive_sdmcwriteonly.h b/src/core/file_sys/archive_sdmcwriteonly.h
new file mode 100644
index 000000000..ed977485a
--- /dev/null
+++ b/src/core/file_sys/archive_sdmcwriteonly.h
@@ -0,0 +1,57 @@
+// Copyright 2016 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "core/file_sys/archive_sdmc.h"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// FileSys namespace
+
+namespace FileSys {
+
+/**
+ * Archive backend for SDMC write-only archive.
+ * The behaviour of SDMCWriteOnlyArchive is almost the same as SDMCArchive, except for
+ *  - OpenDirectory is unsupported;
+ *  - OpenFile with read flag is unsupported.
+ */
+class SDMCWriteOnlyArchive : public SDMCArchive {
+public:
+    SDMCWriteOnlyArchive(const std::string& mount_point) : SDMCArchive(mount_point) {}
+
+    std::string GetName() const override {
+        return "SDMCWriteOnlyArchive: " + mount_point;
+    }
+
+    ResultVal<std::unique_ptr<FileBackend>> OpenFile(const Path& path,
+                                                     const Mode& mode) const override;
+
+    ResultVal<std::unique_ptr<DirectoryBackend>> OpenDirectory(const Path& path) const override;
+};
+
+/// File system interface to the SDMC write-only archive
+class ArchiveFactory_SDMCWriteOnly final : public ArchiveFactory {
+public:
+    ArchiveFactory_SDMCWriteOnly(const std::string& mount_point);
+
+    /**
+     * Initialize the archive.
+     * @return true if it initialized successfully
+     */
+    bool Initialize();
+
+    std::string GetName() const override {
+        return "SDMCWriteOnly";
+    }
+
+    ResultVal<std::unique_ptr<ArchiveBackend>> Open(const Path& path) override;
+    ResultCode Format(const Path& path, const FileSys::ArchiveFormatInfo& format_info) override;
+    ResultVal<ArchiveFormatInfo> GetFormatInfo(const Path& path) const override;
+
+private:
+    std::string sdmc_directory;
+};
+
+} // namespace FileSys
diff --git a/src/core/file_sys/errors.h b/src/core/file_sys/errors.h
index f9299364c..fd1b07df0 100644
--- a/src/core/file_sys/errors.h
+++ b/src/core/file_sys/errors.h
@@ -13,6 +13,8 @@ const ResultCode ERROR_UNSUPPORTED_OPEN_FLAGS(ErrorDescription::FS_UnsupportedOp
                                               ErrorLevel::Usage);
 const ResultCode ERROR_INVALID_OPEN_FLAGS(ErrorDescription::FS_InvalidOpenFlags, ErrorModule::FS,
                                           ErrorSummary::Canceled, ErrorLevel::Status);
+const ResultCode ERROR_INVALID_READ_FLAG(ErrorDescription::FS_InvalidReadFlag, ErrorModule::FS,
+                                         ErrorSummary::InvalidArgument, ErrorLevel::Usage);
 const ResultCode ERROR_FILE_NOT_FOUND(ErrorDescription::FS_FileNotFound, ErrorModule::FS,
                                       ErrorSummary::NotFound, ErrorLevel::Status);
 const ResultCode ERROR_PATH_NOT_FOUND(ErrorDescription::FS_PathNotFound, ErrorModule::FS,
diff --git a/src/core/hle/result.h b/src/core/hle/result.h
index a355f970a..f7356f9d8 100644
--- a/src/core/hle/result.h
+++ b/src/core/hle/result.h
@@ -33,6 +33,7 @@ enum class ErrorDescription : u32 {
     OutofRangeOrMisalignedAddress =
         513, // TODO(purpasmart): Check if this name fits its actual usage
     GPU_FirstInitialization = 519,
+    FS_InvalidReadFlag = 700,
     FS_InvalidPath = 702,
     FS_WriteBeyondEnd = 705,
     FS_UnsupportedOpenFlags = 760,
diff --git a/src/core/hle/service/fs/archive.cpp b/src/core/hle/service/fs/archive.cpp
index 891d7bc84..62cf2c249 100644
--- a/src/core/hle/service/fs/archive.cpp
+++ b/src/core/hle/service/fs/archive.cpp
@@ -18,6 +18,7 @@
 #include "core/file_sys/archive_savedata.h"
 #include "core/file_sys/archive_savedatacheck.h"
 #include "core/file_sys/archive_sdmc.h"
+#include "core/file_sys/archive_sdmcwriteonly.h"
 #include "core/file_sys/archive_systemsavedata.h"
 #include "core/file_sys/directory_backend.h"
 #include "core/file_sys/file_backend.h"
@@ -526,6 +527,13 @@ void RegisterArchiveTypes() {
         LOG_ERROR(Service_FS, "Can't instantiate SDMC archive with path %s",
                   sdmc_directory.c_str());
 
+    auto sdmcwo_factory = std::make_unique<FileSys::ArchiveFactory_SDMCWriteOnly>(sdmc_directory);
+    if (sdmcwo_factory->Initialize())
+        RegisterArchiveType(std::move(sdmcwo_factory), ArchiveIdCode::SDMCWriteOnly);
+    else
+        LOG_ERROR(Service_FS, "Can't instantiate SDMCWriteOnly archive with path %s",
+                  sdmc_directory.c_str());
+
     // Create the SaveData archive
     auto savedata_factory = std::make_unique<FileSys::ArchiveFactory_SaveData>(sdmc_directory);
     RegisterArchiveType(std::move(savedata_factory), ArchiveIdCode::SaveData);