1 files changed, 65 insertions, 0 deletions
diff --git a/src/core/file_sys/fssystem/fssystem_integrity_verification_storage.h b/src/core/file_sys/fssystem/fssystem_integrity_verification_storage.h
new file mode 100644
index 000000000..09f76799d
--- /dev/null
+++ b/src/core/file_sys/fssystem/fssystem_integrity_verification_storage.h
@@ -0,0 +1,65 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <optional>
+
+#include "core/file_sys/fssystem/fs_i_storage.h"
+#include "core/file_sys/fssystem/fs_types.h"
+
+namespace FileSys {
+
+class IntegrityVerificationStorage : public IReadOnlyStorage {
+    YUZU_NON_COPYABLE(IntegrityVerificationStorage);
+    YUZU_NON_MOVEABLE(IntegrityVerificationStorage);
+
+public:
+    static constexpr s64 HashSize = 256 / 8;
+
+    struct BlockHash {
+        std::array<u8, HashSize> hash;
+    };
+    static_assert(std::is_trivial_v<BlockHash>);
+
+public:
+    IntegrityVerificationStorage()
+        : m_verification_block_size(0), m_verification_block_order(0),
+          m_upper_layer_verification_block_size(0), m_upper_layer_verification_block_order(0) {}
+    virtual ~IntegrityVerificationStorage() override {
+        this->Finalize();
+    }
+
+    void Initialize(VirtualFile hs, VirtualFile ds, s64 verif_block_size,
+                    s64 upper_layer_verif_block_size, bool is_real_data);
+    void Finalize();
+
+    virtual size_t Read(u8* buffer, size_t size, size_t offset) const override;
+    virtual size_t GetSize() const override;
+
+    s64 GetBlockSize() const {
+        return m_verification_block_size;
+    }
+
+private:
+    static void SetValidationBit(BlockHash* hash) {
+        ASSERT(hash != nullptr);
+        hash->hash[HashSize - 1] |= 0x80;
+    }
+
+    static bool IsValidationBit(const BlockHash* hash) {
+        ASSERT(hash != nullptr);
+        return (hash->hash[HashSize - 1] & 0x80) != 0;
+    }
+
+private:
+    VirtualFile m_hash_storage;
+    VirtualFile m_data_storage;
+    s64 m_verification_block_size;
+    s64 m_verification_block_order;
+    s64 m_upper_layer_verification_block_size;
+    s64 m_upper_layer_verification_block_order;
+    bool m_is_real_data;
+};
+
+} // namespace FileSys