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93 lines
3 KiB
C++
93 lines
3 KiB
C++
// Copyright 2022 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 <string>
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#include <vector>
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#include "Common/CommonTypes.h"
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#include "Common/Crypto/AES.h"
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#include "Common/IOFile.h"
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#include "DiscIO/Blob.h"
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// This is the file format used for Wii games released on the Wii U eShop.
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namespace DiscIO
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{
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static constexpr u32 NFS_MAGIC = 0x53474745; // "EGGS" (byteswapped to little endian)
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struct NFSLBARange
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{
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u32 start_block;
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u32 num_blocks;
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};
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struct NFSHeader
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{
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u32 magic; // EGGS
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u32 version;
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u32 unknown_1;
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u32 unknown_2;
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u32 lba_range_count;
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std::array<NFSLBARange, 61> lba_ranges;
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u32 end_magic; // SGGE
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};
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static_assert(sizeof(NFSHeader) == 0x200);
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class NFSFileReader final : public BlobReader
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{
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public:
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static std::unique_ptr<NFSFileReader> Create(File::IOFile first_file,
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const std::string& directory_path);
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BlobType GetBlobType() const override { return BlobType::NFS; }
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std::unique_ptr<BlobReader> CopyReader() const override;
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u64 GetRawSize() const override;
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u64 GetDataSize() const override;
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DataSizeType GetDataSizeType() const override { return DataSizeType::LowerBound; }
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u64 GetBlockSize() const override { return BLOCK_SIZE; }
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bool HasFastRandomAccessInBlock() const override { return false; }
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std::string GetCompressionMethod() const override { return {}; }
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std::optional<int> GetCompressionLevel() const override { return std::nullopt; }
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bool Read(u64 offset, u64 nbytes, u8* out_ptr) override;
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private:
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using Key = std::array<u8, Common::AES::Context::KEY_SIZE>;
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static constexpr u32 BLOCK_SIZE = 0x8000;
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static constexpr u32 MAX_FILE_SIZE = 0xFA00000;
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static bool ReadKey(const std::string& path, const std::string& directory, Key* key_out);
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static std::vector<NFSLBARange> GetLBARanges(const NFSHeader& header);
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static std::vector<File::IOFile> OpenFiles(const std::string& directory, File::IOFile first_file,
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u64 expected_raw_size, u64* raw_size_out);
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static u64 CalculateExpectedRawSize(const std::vector<NFSLBARange>& lba_ranges);
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static u64 CalculateExpectedDataSize(const std::vector<NFSLBARange>& lba_ranges);
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NFSFileReader(std::vector<NFSLBARange> lba_ranges, std::vector<File::IOFile> files, Key key,
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u64 raw_size);
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u64 ToPhysicalBlockIndex(u64 logical_block_index) const;
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bool ReadEncryptedBlock(u64 physical_block_index);
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void DecryptBlock(u64 logical_block_index);
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bool ReadAndDecryptBlock(u64 logical_block_index);
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std::array<u8, BLOCK_SIZE> m_current_block_encrypted;
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std::array<u8, BLOCK_SIZE> m_current_block_decrypted;
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u64 m_current_logical_block_index = std::numeric_limits<u64>::max();
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std::vector<NFSLBARange> m_lba_ranges;
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std::vector<File::IOFile> m_files;
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std::unique_ptr<Common::AES::Context> m_aes_context;
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u64 m_raw_size;
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u64 m_data_size;
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Key m_key;
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};
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} // namespace DiscIO
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