1 files changed, 44 insertions, 0 deletions
diff --git a/src/core/file_sys/fssystem/fssystem_hierarchical_sha256_storage.h b/src/core/file_sys/fssystem/fssystem_hierarchical_sha256_storage.h
new file mode 100644
index 000000000..18df400af
--- /dev/null
+++ b/src/core/file_sys/fssystem/fssystem_hierarchical_sha256_storage.h
@@ -0,0 +1,44 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <mutex>
+
+#include "core/file_sys/errors.h"
+#include "core/file_sys/fssystem/fs_i_storage.h"
+#include "core/file_sys/vfs.h"
+
+namespace FileSys {
+
+class HierarchicalSha256Storage : public IReadOnlyStorage {
+    YUZU_NON_COPYABLE(HierarchicalSha256Storage);
+    YUZU_NON_MOVEABLE(HierarchicalSha256Storage);
+
+public:
+    static constexpr s32 LayerCount = 3;
+    static constexpr size_t HashSize = 256 / 8;
+
+public:
+    HierarchicalSha256Storage() : m_mutex() {}
+
+    Result Initialize(VirtualFile* base_storages, s32 layer_count, size_t htbs, void* hash_buf,
+                      size_t hash_buf_size);
+
+    virtual size_t GetSize() const override {
+        return m_base_storage->GetSize();
+    }
+
+    virtual size_t Read(u8* buffer, size_t length, size_t offset) const override;
+
+private:
+    VirtualFile m_base_storage;
+    s64 m_base_storage_size;
+    char* m_hash_buffer;
+    size_t m_hash_buffer_size;
+    s32 m_hash_target_block_size;
+    s32 m_log_size_ratio;
+    std::mutex m_mutex;
+};
+
+} // namespace FileSys