mirror of
https://github.com/yuzu-emu/yuzu-android.git
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4783ad54de
Each header is 512 bytes in size, which is kind of an excessive amount to copy all the time when it's possible to avoid doing so.
135 lines
3.6 KiB
C++
135 lines
3.6 KiB
C++
// Copyright 2018 yuzu emulator team
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <array>
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#include <memory>
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#include <string>
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#include <vector>
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#include <boost/optional.hpp>
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#include "common/common_funcs.h"
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#include "common/common_types.h"
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#include "common/swap.h"
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#include "core/crypto/key_manager.h"
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#include "core/file_sys/vfs.h"
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namespace Loader {
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enum class ResultStatus : u16;
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}
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namespace FileSys {
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union NCASectionHeader;
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enum class NCAContentType : u8 {
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Program = 0,
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Meta = 1,
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Control = 2,
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Manual = 3,
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Data = 4,
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Data_Unknown5 = 5, ///< Seems to be used on some system archives
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};
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enum class NCASectionCryptoType : u8 {
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NONE = 1,
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XTS = 2,
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CTR = 3,
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BKTR = 4,
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};
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struct NCASectionTableEntry {
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u32_le media_offset;
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u32_le media_end_offset;
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INSERT_PADDING_BYTES(0x8);
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};
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static_assert(sizeof(NCASectionTableEntry) == 0x10, "NCASectionTableEntry has incorrect size.");
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struct NCAHeader {
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std::array<u8, 0x100> rsa_signature_1;
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std::array<u8, 0x100> rsa_signature_2;
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u32_le magic;
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u8 is_system;
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NCAContentType content_type;
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u8 crypto_type;
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u8 key_index;
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u64_le size;
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u64_le title_id;
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INSERT_PADDING_BYTES(0x4);
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u32_le sdk_version;
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u8 crypto_type_2;
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INSERT_PADDING_BYTES(15);
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std::array<u8, 0x10> rights_id;
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std::array<NCASectionTableEntry, 0x4> section_tables;
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std::array<std::array<u8, 0x20>, 0x4> hash_tables;
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std::array<u8, 0x40> key_area;
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INSERT_PADDING_BYTES(0xC0);
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};
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static_assert(sizeof(NCAHeader) == 0x400, "NCAHeader has incorrect size.");
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inline bool IsDirectoryExeFS(const std::shared_ptr<VfsDirectory>& pfs) {
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// According to switchbrew, an exefs must only contain these two files:
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return pfs->GetFile("main") != nullptr && pfs->GetFile("main.npdm") != nullptr;
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}
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bool IsValidNCA(const NCAHeader& header);
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// An implementation of VfsDirectory that represents a Nintendo Content Archive (NCA) conatiner.
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// After construction, use GetStatus to determine if the file is valid and ready to be used.
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class NCA : public ReadOnlyVfsDirectory {
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public:
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explicit NCA(VirtualFile file, VirtualFile bktr_base_romfs = nullptr,
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u64 bktr_base_ivfc_offset = 0);
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~NCA() override;
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Loader::ResultStatus GetStatus() const;
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std::vector<std::shared_ptr<VfsFile>> GetFiles() const override;
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std::vector<std::shared_ptr<VfsDirectory>> GetSubdirectories() const override;
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std::string GetName() const override;
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std::shared_ptr<VfsDirectory> GetParentDirectory() const override;
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NCAContentType GetType() const;
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u64 GetTitleId() const;
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bool IsUpdate() const;
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VirtualFile GetRomFS() const;
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VirtualDir GetExeFS() const;
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VirtualFile GetBaseFile() const;
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// Returns the base ivfc offset used in BKTR patching.
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u64 GetBaseIVFCOffset() const;
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protected:
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bool ReplaceFileWithSubdirectory(VirtualFile file, VirtualDir dir) override;
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private:
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u8 GetCryptoRevision() const;
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boost::optional<Core::Crypto::Key128> GetKeyAreaKey(NCASectionCryptoType type) const;
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boost::optional<Core::Crypto::Key128> GetTitlekey();
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VirtualFile Decrypt(const NCASectionHeader& header, VirtualFile in, u64 starting_offset);
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std::vector<VirtualDir> dirs;
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std::vector<VirtualFile> files;
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VirtualFile romfs = nullptr;
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VirtualDir exefs = nullptr;
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VirtualFile file;
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VirtualFile bktr_base_romfs;
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u64 ivfc_offset;
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NCAHeader header{};
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bool has_rights_id{};
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Loader::ResultStatus status{};
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bool encrypted;
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bool is_update;
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Core::Crypto::KeyManager keys;
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};
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} // namespace FileSys
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