1 files changed, 62 insertions, 0 deletions

diff --git a/src/core/hle/service/filesystem/fsp/fs_i_storage.cpp b/src/core/hle/service/filesystem/fsp/fs_i_storage.cpp
new file mode 100644
index 000000000..98223c1f9
--- /dev/null
+++ b/src/core/hle/service/filesystem/fsp/fs_i_storage.cpp
@@ -0,0 +1,62 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "core/file_sys/errors.h"
+#include "core/hle/service/filesystem/fsp/fs_i_storage.h"
+#include "core/hle/service/ipc_helpers.h"
+
+namespace Service::FileSystem {
+
+IStorage::IStorage(Core::System& system_, FileSys::VirtualFile backend_)
+    : ServiceFramework{system_, "IStorage"}, backend(std::move(backend_)) {
+    static const FunctionInfo functions[] = {
+        {0, &IStorage::Read, "Read"},
+        {1, nullptr, "Write"},
+        {2, nullptr, "Flush"},
+        {3, nullptr, "SetSize"},
+        {4, &IStorage::GetSize, "GetSize"},
+        {5, nullptr, "OperateRange"},
+    };
+    RegisterHandlers(functions);
+}
+
+void IStorage::Read(HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+    const s64 offset = rp.Pop<s64>();
+    const s64 length = rp.Pop<s64>();
+
+    LOG_DEBUG(Service_FS, "called, offset=0x{:X}, length={}", offset, length);
+
+    // Error checking
+    if (length < 0) {
+        LOG_ERROR(Service_FS, "Length is less than 0, length={}", length);
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(FileSys::ResultInvalidSize);
+        return;
+    }
+    if (offset < 0) {
+        LOG_ERROR(Service_FS, "Offset is less than 0, offset={}", offset);
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(FileSys::ResultInvalidOffset);
+        return;
+    }
+
+    // Read the data from the Storage backend
+    std::vector<u8> output = backend->ReadBytes(length, offset);
+    // Write the data to memory
+    ctx.WriteBuffer(output);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(ResultSuccess);
+}
+
+void IStorage::GetSize(HLERequestContext& ctx) {
+    const u64 size = backend->GetSize();
+    LOG_DEBUG(Service_FS, "called, size={}", size);
+
+    IPC::ResponseBuilder rb{ctx, 4};
+    rb.Push(ResultSuccess);
+    rb.Push<u64>(size);
+}
+
+} // namespace Service::FileSystem