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57 lines
2.0 KiB
C++
57 lines
2.0 KiB
C++
// Copyright 2020 Dolphin Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#include <array>
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#include <limits>
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#include <memory>
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#include "Common/CommonTypes.h"
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#include "DiscIO/VolumeWii.h"
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namespace DiscIO
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{
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class BlobReader;
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class WiiEncryptionCache
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{
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public:
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using Key = std::array<u8, VolumeWii::AES_KEY_SIZE>;
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using HashExceptionCallback = std::function<void(
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VolumeWii::HashBlock hash_blocks[VolumeWii::BLOCKS_PER_GROUP], u64 offset)>;
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// The blob pointer is kept around for the lifetime of this object.
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explicit WiiEncryptionCache(BlobReader* blob);
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~WiiEncryptionCache();
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WiiEncryptionCache(WiiEncryptionCache&&) = default;
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WiiEncryptionCache& operator=(WiiEncryptionCache&&) = default;
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// It would be possible to write a custom copy constructor and assignment operator
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// for this class, but there has been no reason to do so.
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WiiEncryptionCache(const WiiEncryptionCache&) = delete;
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WiiEncryptionCache& operator=(const WiiEncryptionCache&) = delete;
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// Encrypts exactly one group.
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// If the returned pointer is nullptr, reading from the blob failed.
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// If the returned pointer is not nullptr, it is guaranteed to be valid until
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// the next call of this function or the destruction of this object.
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const std::array<u8, VolumeWii::GROUP_TOTAL_SIZE>*
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EncryptGroup(u64 offset, u64 partition_data_offset, u64 partition_data_decrypted_size,
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const Key& key, const HashExceptionCallback& hash_exception_callback = {});
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// Encrypts a variable number of groups, as determined by the offset and size parameters.
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// Supports reading groups partially.
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bool EncryptGroups(u64 offset, u64 size, u8* out_ptr, u64 partition_data_offset,
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u64 partition_data_decrypted_size, const Key& key,
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const HashExceptionCallback& hash_exception_callback = {});
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private:
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BlobReader* m_blob;
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std::unique_ptr<std::array<u8, VolumeWii::GROUP_TOTAL_SIZE>> m_cache;
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u64 m_cached_offset;
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};
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} // namespace DiscIO
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