dolphin/Source/Core/DiscIO/WiiEncryptionCache.h

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