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suyu/src/core/file_sys/vfs_concat.h

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// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <memory>
#include <string_view>
#include <boost/container/flat_map.hpp>
#include "core/file_sys/vfs.h"
namespace FileSys {
// Wrapper function to allow for more efficient handling of files.size() == 0, 1 cases.
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VirtualFile ConcatenateFiles(std::vector<VirtualFile> files, std::string name = "");
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// Class that wraps multiple vfs files and concatenates them, making reads seamless. Currently
// read-only.
class ConcatenatedVfsFile : public VfsFile {
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friend VirtualFile ConcatenateFiles(std::vector<VirtualFile> files, std::string name);
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ConcatenatedVfsFile(std::vector<VirtualFile> files, std::string name);
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public:
~ConcatenatedVfsFile() override;
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std::string GetName() const override;
std::size_t GetSize() const override;
bool Resize(std::size_t new_size) override;
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std::shared_ptr<VfsDirectory> GetContainingDirectory() const override;
bool IsWritable() const override;
bool IsReadable() const override;
std::size_t Read(u8* data, std::size_t length, std::size_t offset) const override;
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 name) override;
private:
// Maps starting offset to file -- more efficient.
boost::container::flat_map<u64, VirtualFile> files;
std::string name;
};
} // namespace FileSys