51 lines
1.8 KiB
C++
51 lines
1.8 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 <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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// An implementation of VfsFile that wraps around another VfsFile at a certain offset.
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// Similar to seeking to an offset.
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// If the file is writable, operations that would write past the end of the offset file will expand
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// the size of this wrapper.
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class OffsetVfsFile : public VfsFile {
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public:
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OffsetVfsFile(std::shared_ptr<VfsFile> file, std::size_t size, std::size_t offset = 0,
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std::string new_name = "", VirtualDir new_parent = nullptr);
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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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boost::optional<u8> ReadByte(std::size_t offset) const override;
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std::vector<u8> ReadBytes(std::size_t size, std::size_t offset) const override;
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std::vector<u8> ReadAllBytes() const override;
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bool WriteByte(u8 data, std::size_t offset) override;
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std::size_t WriteBytes(const std::vector<u8>& data, std::size_t offset) override;
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bool Rename(std::string_view name) override;
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std::size_t GetOffset() const;
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private:
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std::size_t TrimToFit(std::size_t r_size, std::size_t r_offset) const;
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std::shared_ptr<VfsFile> file;
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std::size_t offset;
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std::size_t size;
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std::string name;
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VirtualDir parent;
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};
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} // namespace FileSys
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