60 lines
2.0 KiB
C++
60 lines
2.0 KiB
C++
// SPDX-FileCopyrightText: Copyright 2018 yuzu 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 <compare>
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#include <map>
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#include <memory>
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#include "core/file_sys/vfs.h"
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namespace FileSys {
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// Class that wraps multiple vfs files and concatenates them, making reads seamless. Currently
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// read-only.
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class ConcatenatedVfsFile : public VfsFile {
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private:
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struct ConcatenationEntry {
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u64 offset;
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VirtualFile file;
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auto operator<=>(const ConcatenationEntry& other) const {
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return this->offset <=> other.offset;
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}
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};
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using ConcatenationMap = std::vector<ConcatenationEntry>;
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explicit ConcatenatedVfsFile(std::vector<ConcatenationEntry>&& concatenation_map,
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std::string&& name);
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bool VerifyContinuity() const;
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public:
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~ConcatenatedVfsFile() override;
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/// Wrapper function to allow for more efficient handling of files.size() == 0, 1 cases.
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static VirtualFile MakeConcatenatedFile(const std::vector<VirtualFile>& files,
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std::string&& name);
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/// Convenience function that turns a map of offsets to files into a concatenated file, filling
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/// gaps with a given filler byte.
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static VirtualFile MakeConcatenatedFile(u8 filler_byte,
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const std::multimap<u64, VirtualFile>& files,
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std::string&& name);
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std::string GetName() const override;
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std::size_t GetSize() const override;
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bool Resize(std::size_t new_size) override;
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VirtualDir GetContainingDirectory() const override;
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bool IsWritable() const override;
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bool IsReadable() const override;
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std::size_t Read(u8* data, std::size_t length, std::size_t offset) const override;
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std::size_t Write(const u8* data, std::size_t length, std::size_t offset) override;
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bool Rename(std::string_view new_name) override;
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private:
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ConcatenationMap concatenation_map;
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std::string name;
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};
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} // namespace FileSys
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