ff45c39578
Allows some implementations to avoid completely zeroing out the internal buffer of the optional, and instead only set the validity byte within the structure. This also makes it consistent how we return empty optionals.
82 lines
1.9 KiB
C++
82 lines
1.9 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 <algorithm>
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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 StaticVfsFile : public VfsFile {
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public:
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explicit StaticVfsFile(u8 value, std::size_t size = 0, std::string name = "",
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VirtualDir parent = nullptr)
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: value{value}, size{size}, name{std::move(name)}, parent{std::move(parent)} {}
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std::string GetName() const override {
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return name;
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}
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std::size_t GetSize() const override {
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return size;
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}
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bool Resize(std::size_t new_size) override {
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size = new_size;
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return true;
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}
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std::shared_ptr<VfsDirectory> GetContainingDirectory() const override {
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return parent;
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}
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bool IsWritable() const override {
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return false;
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}
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bool IsReadable() const override {
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return true;
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}
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std::size_t Read(u8* data, std::size_t length, std::size_t offset) const override {
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const auto read = std::min(length, size - offset);
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std::fill(data, data + read, value);
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return read;
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}
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std::size_t Write(const u8* data, std::size_t length, std::size_t offset) override {
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return 0;
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}
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std::optional<u8> ReadByte(std::size_t offset) const override {
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if (offset >= size) {
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return std::nullopt;
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}
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return value;
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}
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std::vector<u8> ReadBytes(std::size_t length, std::size_t offset) const override {
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const auto read = std::min(length, size - offset);
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return std::vector<u8>(read, value);
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}
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bool Rename(std::string_view new_name) override {
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name = new_name;
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return true;
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}
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private:
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u8 value;
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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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