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fd1c3aa14e
When zero byte files are present, the key (offset) for that file is identical to the file right after. A std::map isn't able to fit key-value pairs with identical keys (offsets), therefore, the solution is to use std::multimap which permits multiple entries with the same key. This most prominently fixes Pokemon Sword and Shield weather with any RomFS mod applied.
48 lines
1.7 KiB
C++
48 lines
1.7 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 "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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ConcatenatedVfsFile(std::vector<VirtualFile> files, std::string name);
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ConcatenatedVfsFile(std::multimap<u64, VirtualFile> files, std::string name);
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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(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
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/// gaps with a given filler byte.
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static VirtualFile MakeConcatenatedFile(u8 filler_byte, 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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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::multimap<u64, VirtualFile> files;
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std::string name;
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};
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} // namespace FileSys
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