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Diffstat (limited to 'src/core/file_sys/vfs/vfs_concat.h')
-rw-r--r-- | src/core/file_sys/vfs/vfs_concat.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/src/core/file_sys/vfs/vfs_concat.h b/src/core/file_sys/vfs/vfs_concat.h new file mode 100644 index 000000000..6d12af762 --- /dev/null +++ b/src/core/file_sys/vfs/vfs_concat.h @@ -0,0 +1,57 @@ +// SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project +// SPDX-License-Identifier: GPL-2.0-or-later + +#pragma once + +#include <compare> +#include <map> +#include <memory> +#include "core/file_sys/vfs/vfs.h" + +namespace FileSys { + +// Class that wraps multiple vfs files and concatenates them, making reads seamless. Currently +// read-only. +class ConcatenatedVfsFile : public VfsFile { +private: + struct ConcatenationEntry { + u64 offset; + VirtualFile file; + + auto operator<=>(const ConcatenationEntry& other) const { + return this->offset <=> other.offset; + } + }; + using ConcatenationMap = std::vector<ConcatenationEntry>; + + explicit ConcatenatedVfsFile(std::string&& name, + std::vector<ConcatenationEntry>&& concatenation_map); + bool VerifyContinuity() const; + +public: + ~ConcatenatedVfsFile() override; + + /// Wrapper function to allow for more efficient handling of files.size() == 0, 1 cases. + static VirtualFile MakeConcatenatedFile(std::string&& name, std::vector<VirtualFile>&& files); + + /// Convenience function that turns a map of offsets to files into a concatenated file, filling + /// gaps with a given filler byte. + static VirtualFile MakeConcatenatedFile(u8 filler_byte, std::string&& name, + std::vector<std::pair<u64, VirtualFile>>&& files); + + std::string GetName() const override; + std::size_t GetSize() const override; + bool Resize(std::size_t new_size) override; + VirtualDir 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; + bool Rename(std::string_view new_name) override; + +private: + ConcatenationMap concatenation_map; + std::string name; +}; + +} // namespace FileSys |