3 files changed, 301 insertions, 1 deletions

diff --git a/src/core/file_sys/archive_sdmc.cpp b/src/core/file_sys/archive_sdmc.cpp
index bcb03ed36..c747ba82c 100644
--- a/src/core/file_sys/archive_sdmc.cpp
+++ b/src/core/file_sys/archive_sdmc.cpp
@@ -8,6 +8,8 @@
 #include "common/logging/log.h"
 #include "core/file_sys/archive_sdmc.h"
 #include "core/file_sys/disk_archive.h"
+#include "core/file_sys/errors.h"
+#include "core/file_sys/path_parser.h"
 #include "core/settings.h"
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -15,6 +17,270 @@
 
 namespace FileSys {
 
+ResultVal<std::unique_ptr<FileBackend>> SDMCArchive::OpenFile(const Path& path,
+                                                              const Mode& mode) const {
+    LOG_DEBUG(Service_FS, "called path=%s mode=%01X", path.DebugStr().c_str(), mode.hex);
+
+    const PathParser path_parser(path);
+
+    if (!path_parser.IsValid()) {
+        LOG_ERROR(Service_FS, "Invalid path %s", path.DebugStr().c_str());
+        return ERROR_INVALID_PATH;
+    }
+
+    if (mode.hex == 0) {
+        LOG_ERROR(Service_FS, "Empty open mode");
+        return ERROR_INVALID_OPEN_FLAGS;
+    }
+
+    if (mode.create_flag && !mode.write_flag) {
+        LOG_ERROR(Service_FS, "Create flag set but write flag not set");
+        return ERROR_INVALID_OPEN_FLAGS;
+    }
+
+    const auto full_path = path_parser.BuildHostPath(mount_point);
+
+    switch (path_parser.GetHostStatus(mount_point)) {
+    case PathParser::InvalidMountPoint:
+        LOG_CRITICAL(Service_FS, "(unreachable) Invalid mount point %s", mount_point.c_str());
+        return ERROR_NOT_FOUND;
+    case PathParser::PathNotFound:
+    case PathParser::FileInPath:
+        LOG_ERROR(Service_FS, "Path not found %s", full_path.c_str());
+        return ERROR_NOT_FOUND;
+    case PathParser::DirectoryFound:
+        LOG_ERROR(Service_FS, "%s is not a file", full_path.c_str());
+        return ERROR_UNEXPECTED_FILE_OR_DIRECTORY_SDMC;
+    case PathParser::NotFound:
+        if (!mode.create_flag) {
+            LOG_ERROR(Service_FS, "Non-existing file %s can't be open without mode create.",
+                      full_path.c_str());
+            return ERROR_NOT_FOUND;
+        } else {
+            // Create the file
+            FileUtil::CreateEmptyFile(full_path);
+        }
+        break;
+    }
+
+    FileUtil::IOFile file(full_path, mode.write_flag ? "r+b" : "rb");
+    if (!file.IsOpen()) {
+        LOG_CRITICAL(Service_FS, "(unreachable) Unknown error opening %s", full_path.c_str());
+        return ERROR_NOT_FOUND;
+    }
+
+    auto disk_file = std::make_unique<DiskFile>(std::move(file), mode);
+    return MakeResult<std::unique_ptr<FileBackend>>(std::move(disk_file));
+}
+
+ResultCode SDMCArchive::DeleteFile(const Path& path) const {
+    const PathParser path_parser(path);
+
+    if (!path_parser.IsValid()) {
+        LOG_ERROR(Service_FS, "Invalid path %s", path.DebugStr().c_str());
+        return ERROR_INVALID_PATH;
+    }
+
+    const auto full_path = path_parser.BuildHostPath(mount_point);
+
+    switch (path_parser.GetHostStatus(mount_point)) {
+    case PathParser::InvalidMountPoint:
+        LOG_CRITICAL(Service_FS, "(unreachable) Invalid mount point %s", mount_point.c_str());
+        return ERROR_NOT_FOUND;
+    case PathParser::PathNotFound:
+    case PathParser::FileInPath:
+    case PathParser::NotFound:
+        LOG_ERROR(Service_FS, "%s not found", full_path.c_str());
+        return ERROR_NOT_FOUND;
+    case PathParser::DirectoryFound:
+        LOG_ERROR(Service_FS, "%s is not a file", full_path.c_str());
+        return ERROR_UNEXPECTED_FILE_OR_DIRECTORY_SDMC;
+    }
+
+    if (FileUtil::Delete(full_path)) {
+        return RESULT_SUCCESS;
+    }
+
+    LOG_CRITICAL(Service_FS, "(unreachable) Unknown error deleting %s", full_path.c_str());
+    return ERROR_NOT_FOUND;
+}
+
+ResultCode SDMCArchive::RenameFile(const Path& src_path, const Path& dest_path) const {
+    if (FileUtil::Rename(mount_point + src_path.AsString(), mount_point + dest_path.AsString())) {
+        return RESULT_SUCCESS;
+    }
+
+    // TODO(yuriks): This code probably isn't right, it'll return a Status even if the file didn't
+    // exist or similar. Verify.
+    return ResultCode(ErrorDescription::NoData, ErrorModule::FS, // TODO: verify description
+                      ErrorSummary::NothingHappened, ErrorLevel::Status);
+}
+
+template <typename T>
+static ResultCode DeleteDirectoryHelper(const Path& path, const std::string& mount_point,
+                                        T deleter) {
+    const PathParser path_parser(path);
+
+    if (!path_parser.IsValid()) {
+        LOG_ERROR(Service_FS, "Invalid path %s", path.DebugStr().c_str());
+        return ERROR_INVALID_PATH;
+    }
+
+    if (path_parser.IsRootDirectory())
+        return ERROR_NOT_FOUND;
+
+    const auto full_path = path_parser.BuildHostPath(mount_point);
+
+    switch (path_parser.GetHostStatus(mount_point)) {
+    case PathParser::InvalidMountPoint:
+        LOG_CRITICAL(Service_FS, "(unreachable) Invalid mount point %s", mount_point.c_str());
+        return ERROR_NOT_FOUND;
+    case PathParser::PathNotFound:
+    case PathParser::NotFound:
+        LOG_ERROR(Service_FS, "Path not found %s", full_path.c_str());
+        return ERROR_NOT_FOUND;
+    case PathParser::FileInPath:
+    case PathParser::FileFound:
+        LOG_ERROR(Service_FS, "Unexpected file in path %s", full_path.c_str());
+        return ERROR_UNEXPECTED_FILE_OR_DIRECTORY_SDMC;
+    }
+
+    if (deleter(full_path)) {
+        return RESULT_SUCCESS;
+    }
+
+    LOG_ERROR(Service_FS, "Directory not empty %s", full_path.c_str());
+    return ERROR_UNEXPECTED_FILE_OR_DIRECTORY_SDMC;
+}
+
+ResultCode SDMCArchive::DeleteDirectory(const Path& path) const {
+    return DeleteDirectoryHelper(path, mount_point, FileUtil::DeleteDir);
+}
+
+ResultCode SDMCArchive::DeleteDirectoryRecursively(const Path& path) const {
+    return DeleteDirectoryHelper(
+        path, mount_point, [](const std::string& p) { return FileUtil::DeleteDirRecursively(p); });
+}
+
+ResultCode SDMCArchive::CreateFile(const FileSys::Path& path, u64 size) const {
+    const PathParser path_parser(path);
+
+    if (!path_parser.IsValid()) {
+        LOG_ERROR(Service_FS, "Invalid path %s", path.DebugStr().c_str());
+        return ERROR_INVALID_PATH;
+    }
+
+    const auto full_path = path_parser.BuildHostPath(mount_point);
+
+    switch (path_parser.GetHostStatus(mount_point)) {
+    case PathParser::InvalidMountPoint:
+        LOG_CRITICAL(Service_FS, "(unreachable) Invalid mount point %s", mount_point.c_str());
+        return ERROR_NOT_FOUND;
+    case PathParser::PathNotFound:
+    case PathParser::FileInPath:
+        LOG_ERROR(Service_FS, "Path not found %s", full_path.c_str());
+        return ERROR_NOT_FOUND;
+    case PathParser::DirectoryFound:
+        LOG_ERROR(Service_FS, "%s already exists", full_path.c_str());
+        return ERROR_UNEXPECTED_FILE_OR_DIRECTORY_SDMC;
+    case PathParser::FileFound:
+        LOG_ERROR(Service_FS, "%s already exists", full_path.c_str());
+        return ERROR_ALREADY_EXISTS;
+    }
+
+    if (size == 0) {
+        FileUtil::CreateEmptyFile(full_path);
+        return RESULT_SUCCESS;
+    }
+
+    FileUtil::IOFile file(full_path, "wb");
+    // Creates a sparse file (or a normal file on filesystems without the concept of sparse files)
+    // We do this by seeking to the right size, then writing a single null byte.
+    if (file.Seek(size - 1, SEEK_SET) && file.WriteBytes("", 1) == 1) {
+        return RESULT_SUCCESS;
+    }
+
+    LOG_ERROR(Service_FS, "Too large file");
+    return ResultCode(ErrorDescription::TooLarge, ErrorModule::FS, ErrorSummary::OutOfResource,
+                      ErrorLevel::Info);
+}
+
+ResultCode SDMCArchive::CreateDirectory(const Path& path) const {
+    const PathParser path_parser(path);
+
+    if (!path_parser.IsValid()) {
+        LOG_ERROR(Service_FS, "Invalid path %s", path.DebugStr().c_str());
+        return ERROR_INVALID_PATH;
+    }
+
+    const auto full_path = path_parser.BuildHostPath(mount_point);
+
+    switch (path_parser.GetHostStatus(mount_point)) {
+    case PathParser::InvalidMountPoint:
+        LOG_CRITICAL(Service_FS, "(unreachable) Invalid mount point %s", mount_point.c_str());
+        return ERROR_NOT_FOUND;
+    case PathParser::PathNotFound:
+    case PathParser::FileInPath:
+        LOG_ERROR(Service_FS, "Path not found %s", full_path.c_str());
+        return ERROR_NOT_FOUND;
+    case PathParser::DirectoryFound:
+    case PathParser::FileFound:
+        LOG_ERROR(Service_FS, "%s already exists", full_path.c_str());
+        return ERROR_ALREADY_EXISTS;
+    }
+
+    if (FileUtil::CreateDir(mount_point + path.AsString())) {
+        return RESULT_SUCCESS;
+    }
+
+    LOG_CRITICAL(Service_FS, "(unreachable) Unknown error creating %s", mount_point.c_str());
+    return ResultCode(ErrorDescription::NoData, ErrorModule::FS, ErrorSummary::Canceled,
+                      ErrorLevel::Status);
+}
+
+ResultCode SDMCArchive::RenameDirectory(const Path& src_path, const Path& dest_path) const {
+    if (FileUtil::Rename(mount_point + src_path.AsString(), mount_point + dest_path.AsString()))
+        return RESULT_SUCCESS;
+
+    // TODO(yuriks): This code probably isn't right, it'll return a Status even if the file didn't
+    // exist or similar. Verify.
+    return ResultCode(ErrorDescription::NoData, ErrorModule::FS, // TODO: verify description
+                      ErrorSummary::NothingHappened, ErrorLevel::Status);
+}
+
+ResultVal<std::unique_ptr<DirectoryBackend>> SDMCArchive::OpenDirectory(const Path& path) const {
+    const PathParser path_parser(path);
+
+    if (!path_parser.IsValid()) {
+        LOG_ERROR(Service_FS, "Invalid path %s", path.DebugStr().c_str());
+        return ERROR_INVALID_PATH;
+    }
+
+    const auto full_path = path_parser.BuildHostPath(mount_point);
+
+    switch (path_parser.GetHostStatus(mount_point)) {
+    case PathParser::InvalidMountPoint:
+        LOG_CRITICAL(Service_FS, "(unreachable) Invalid mount point %s", mount_point.c_str());
+        return ERROR_NOT_FOUND;
+    case PathParser::PathNotFound:
+    case PathParser::NotFound:
+    case PathParser::FileFound:
+        LOG_ERROR(Service_FS, "%s not found", full_path.c_str());
+        return ERROR_NOT_FOUND;
+    case PathParser::FileInPath:
+        LOG_ERROR(Service_FS, "Unexpected file in path %s", full_path.c_str());
+        return ERROR_UNEXPECTED_FILE_OR_DIRECTORY_SDMC;
+    }
+
+    auto directory = std::make_unique<DiskDirectory>(full_path);
+    return MakeResult<std::unique_ptr<DirectoryBackend>>(std::move(directory));
+}
+
+u64 SDMCArchive::GetFreeBytes() const {
+    // TODO: Stubbed to return 1GiB
+    return 1024 * 1024 * 1024;
+}
+
 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());
@@ -35,7 +301,7 @@ bool ArchiveFactory_SDMC::Initialize() {
 }
 
 ResultVal<std::unique_ptr<ArchiveBackend>> ArchiveFactory_SDMC::Open(const Path& path) {
-    auto archive = std::make_unique<DiskArchive>(sdmc_directory);
+    auto archive = std::make_unique<SDMCArchive>(sdmc_directory);
     return MakeResult<std::unique_ptr<ArchiveBackend>>(std::move(archive));
 }
 
diff --git a/src/core/file_sys/archive_sdmc.h b/src/core/file_sys/archive_sdmc.h
index 88e855351..4fa47ff35 100644
--- a/src/core/file_sys/archive_sdmc.h
+++ b/src/core/file_sys/archive_sdmc.h
@@ -14,6 +14,31 @@
 
 namespace FileSys {
 
+/// Archive backend for SDMC archive
+class SDMCArchive : public ArchiveBackend {
+public:
+    SDMCArchive(const std::string& mount_point_) : mount_point(mount_point_) {}
+
+    std::string GetName() const override {
+        return "SDMCArchive: " + mount_point;
+    }
+
+    ResultVal<std::unique_ptr<FileBackend>> OpenFile(const Path& path,
+                                                     const Mode& mode) const override;
+    ResultCode DeleteFile(const Path& path) const override;
+    ResultCode RenameFile(const Path& src_path, const Path& dest_path) const override;
+    ResultCode DeleteDirectory(const Path& path) const override;
+    ResultCode DeleteDirectoryRecursively(const Path& path) const override;
+    ResultCode CreateFile(const Path& path, u64 size) const override;
+    ResultCode CreateDirectory(const Path& path) const override;
+    ResultCode RenameDirectory(const Path& src_path, const Path& dest_path) const override;
+    ResultVal<std::unique_ptr<DirectoryBackend>> OpenDirectory(const Path& path) const override;
+    u64 GetFreeBytes() const override;
+
+protected:
+    std::string mount_point;
+};
+
 /// File system interface to the SDMC archive
 class ArchiveFactory_SDMC final : public ArchiveFactory {
 public:
diff --git a/src/core/file_sys/errors.h b/src/core/file_sys/errors.h
index da7e82642..f9299364c 100644
--- a/src/core/file_sys/errors.h
+++ b/src/core/file_sys/errors.h
@@ -11,18 +11,27 @@ const ResultCode ERROR_INVALID_PATH(ErrorDescription::FS_InvalidPath, ErrorModul
 const ResultCode ERROR_UNSUPPORTED_OPEN_FLAGS(ErrorDescription::FS_UnsupportedOpenFlags,
                                               ErrorModule::FS, ErrorSummary::NotSupported,
                                               ErrorLevel::Usage);
+const ResultCode ERROR_INVALID_OPEN_FLAGS(ErrorDescription::FS_InvalidOpenFlags, ErrorModule::FS,
+                                          ErrorSummary::Canceled, ErrorLevel::Status);
 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,
                                       ErrorSummary::NotFound, ErrorLevel::Status);
+const ResultCode ERROR_NOT_FOUND(ErrorDescription::FS_NotFound, ErrorModule::FS,
+                                 ErrorSummary::NotFound, ErrorLevel::Status);
 const ResultCode ERROR_UNEXPECTED_FILE_OR_DIRECTORY(ErrorDescription::FS_UnexpectedFileOrDirectory,
                                                     ErrorModule::FS, ErrorSummary::NotSupported,
                                                     ErrorLevel::Usage);
+const ResultCode ERROR_UNEXPECTED_FILE_OR_DIRECTORY_SDMC(ErrorDescription::FS_NotAFile,
+                                                         ErrorModule::FS, ErrorSummary::Canceled,
+                                                         ErrorLevel::Status);
 const ResultCode ERROR_DIRECTORY_ALREADY_EXISTS(ErrorDescription::FS_DirectoryAlreadyExists,
                                                 ErrorModule::FS, ErrorSummary::NothingHappened,
                                                 ErrorLevel::Status);
 const ResultCode ERROR_FILE_ALREADY_EXISTS(ErrorDescription::FS_FileAlreadyExists, ErrorModule::FS,
                                            ErrorSummary::NothingHappened, ErrorLevel::Status);
+const ResultCode ERROR_ALREADY_EXISTS(ErrorDescription::FS_AlreadyExists, ErrorModule::FS,
+                                      ErrorSummary::NothingHappened, ErrorLevel::Status);
 const ResultCode ERROR_DIRECTORY_NOT_EMPTY(ErrorDescription::FS_DirectoryNotEmpty, ErrorModule::FS,
                                            ErrorSummary::Canceled, ErrorLevel::Status);