1 files changed, 82 insertions, 0 deletions
diff --git a/src/core/hle/service/am/storage_accessor.cpp b/src/core/hle/service/am/storage_accessor.cpp
new file mode 100644
index 000000000..7d8c82de3
--- /dev/null
+++ b/src/core/hle/service/am/storage_accessor.cpp
@@ -0,0 +1,82 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "core/hle/service/am/am_results.h"
+#include "core/hle/service/am/storage_accessor.h"
+#include "core/hle/service/ipc_helpers.h"
+
+namespace Service::AM {
+
+IStorageAccessor::IStorageAccessor(Core::System& system_, IStorage& backing_)
+    : ServiceFramework{system_, "IStorageAccessor"}, backing{backing_} {
+    // clang-format off
+        static const FunctionInfo functions[] = {
+            {0, &IStorageAccessor::GetSize, "GetSize"},
+            {10, &IStorageAccessor::Write, "Write"},
+            {11, &IStorageAccessor::Read, "Read"},
+        };
+    // clang-format on
+
+    RegisterHandlers(functions);
+}
+
+IStorageAccessor::~IStorageAccessor() = default;
+
+void IStorageAccessor::GetSize(HLERequestContext& ctx) {
+    LOG_DEBUG(Service_AM, "called");
+
+    IPC::ResponseBuilder rb{ctx, 4};
+
+    rb.Push(ResultSuccess);
+    rb.Push(static_cast<u64>(backing.GetSize()));
+}
+
+void IStorageAccessor::Write(HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+
+    const u64 offset{rp.Pop<u64>()};
+    const auto data{ctx.ReadBuffer()};
+    const std::size_t size{std::min<u64>(data.size(), backing.GetSize() - offset)};
+
+    LOG_DEBUG(Service_AM, "called, offset={}, size={}", offset, size);
+
+    if (offset > backing.GetSize()) {
+        LOG_ERROR(Service_AM,
+                  "offset is out of bounds, backing_buffer_sz={}, data_size={}, offset={}",
+                  backing.GetSize(), size, offset);
+
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(AM::ResultInvalidOffset);
+        return;
+    }
+
+    std::memcpy(backing.GetData().data() + offset, data.data(), size);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(ResultSuccess);
+}
+
+void IStorageAccessor::Read(HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+
+    const u64 offset{rp.Pop<u64>()};
+    const std::size_t size{std::min<u64>(ctx.GetWriteBufferSize(), backing.GetSize() - offset)};
+
+    LOG_DEBUG(Service_AM, "called, offset={}, size={}", offset, size);
+
+    if (offset > backing.GetSize()) {
+        LOG_ERROR(Service_AM, "offset is out of bounds, backing_buffer_sz={}, size={}, offset={}",
+                  backing.GetSize(), size, offset);
+
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(AM::ResultInvalidOffset);
+        return;
+    }
+
+    ctx.WriteBuffer(backing.GetData().data() + offset, size);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(ResultSuccess);
+}
+
+} // namespace Service::AM