76 lines
2.7 KiB
C++
76 lines
2.7 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 <map>
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#include <memory>
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#include <string_view>
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#include <boost/container/flat_map.hpp>
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#include "core/file_sys/vfs.h"
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#include "core/file_sys/vfs_static.h"
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namespace FileSys {
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class ConcatenatedVfsFile;
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// 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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// Convenience function that turns a map of offsets to files into a concatenated file, filling gaps
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// with template parameter.
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template <u8 filler_byte>
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VirtualFile ConcatenateFiles(std::map<u64, VirtualFile> files, std::string name = "") {
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if (files.empty())
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return nullptr;
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if (files.size() == 1)
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return files.begin()->second;
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for (auto iter = files.begin(); iter != --files.end();) {
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const auto old = iter++;
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if (old->first + old->second->GetSize() != iter->first) {
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files.emplace(old->first + old->second->GetSize(),
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std::make_shared<StaticVfsFile<filler_byte>>(iter->first - old->first -
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old->second->GetSize()));
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}
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}
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if (files.begin()->first != 0)
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files.emplace(0, std::make_shared<StaticVfsFile<filler_byte>>(files.begin()->first));
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return std::shared_ptr<VfsFile>(new ConcatenatedVfsFile(std::move(files), std::move(name)));
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}
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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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friend VirtualFile ConcatenateFiles(std::vector<VirtualFile> files, std::string name);
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template <u8 filler_byte>
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friend VirtualFile ConcatenateFiles(std::map<u64, VirtualFile> files, std::string name);
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ConcatenatedVfsFile(std::vector<VirtualFile> files, std::string name);
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ConcatenatedVfsFile(std::map<u64, VirtualFile> files, std::string name);
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public:
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~ConcatenatedVfsFile() override;
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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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std::shared_ptr<VfsDirectory> 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 name) override;
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private:
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// Maps starting offset to file -- more efficient.
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std::map<u64, VirtualFile> files;
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std::string name;
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};
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} // namespace FileSys
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