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https://github.com/dolphin-emu/dolphin.git
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a87dffe52d
Previously, we had WBFS and CISO which both returned an upper bound of the size, and other formats which returned an accurate size. But now we also have NFS, which returns a lower bound of the size. To allow VolumeVerifier to make better informed decisions for NFS, let's use an enum instead of a bool for the type of data size a blob has.
91 lines
2.9 KiB
C++
91 lines
2.9 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 : 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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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);
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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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};
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} // namespace DiscIO
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