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335cf4f2db
A deep-copy method CopyReader has been added to BlobReader (virtual) and all of its subclasses (override). This should create a second BlobReader to open the same set of data but with an independent read pointer so that it doesn't interfere with any reads done on the original Reader. As part of this, IOFile has added code to create a deep copy IOFile pointer onto the same file, with code based on the platform in question to find the file ID from the file pointer and open a new one. There has also been a small piece added to FileInfo to enable a deep copy, but its only subclass at this time already had a copy constructor so this was relatively minor.
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 : 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);
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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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