mirror of
https://github.com/boykopovar/AnyPS5.git
synced 2026-10-22 16:43:05 -05:00
90 lines
2.5 KiB
C++
90 lines
2.5 KiB
C++
#pragma once
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#include <cerrno>
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#include <cstddef>
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#include <cstdio>
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#include <filesystem>
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#include <random>
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#include <string>
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#include <system_error>
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#ifdef _WIN32
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#ifndef NOMINMAX
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#define NOMINMAX
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#endif
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#ifndef WIN32_LEAN_AND_MEAN
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#define WIN32_LEAN_AND_MEAN
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#endif
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#include <windows.h>
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#endif
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namespace savedata {
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template <typename ReplaceOperation>
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inline bool replace_file_with(const std::filesystem::path& path, const void* data, std::size_t size,
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ReplaceOperation&& replace_operation) {
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if (size != 0 && data == nullptr) return false;
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const auto parent = path.parent_path();
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std::error_code error;
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if (!parent.empty()) {
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std::filesystem::create_directories(parent, error);
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if (error) {
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return false;
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}
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}
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std::filesystem::path temporary;
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std::FILE* file = nullptr;
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std::random_device random;
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for (unsigned attempt = 0; attempt < 128; ++attempt) {
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temporary = path;
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temporary += ".tmp." + std::to_string(random()) + "." + std::to_string(random());
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#ifdef _WIN32
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file = _wfopen(temporary.c_str(), L"wbx");
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#else
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file = std::fopen(temporary.c_str(), "wbx");
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#endif
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if (file) break;
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if (errno != EEXIST) return false;
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}
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if (!file) return false;
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struct Cleanup {
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const std::filesystem::path& path;
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std::FILE*& file;
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bool remove = true;
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~Cleanup() {
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if (file) std::fclose(file);
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std::error_code ignored;
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if (remove) std::filesystem::remove(path, ignored);
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}
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} cleanup{temporary, file};
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const bool written = size == 0 || std::fwrite(data, 1, size, file) == size;
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const bool closed = std::fclose(file) == 0;
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file = nullptr;
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if (!written || !closed) return false;
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const bool replaced = replace_operation(temporary, path);
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cleanup.remove = !replaced;
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return replaced;
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}
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inline bool move_replacing(const std::filesystem::path& source, const std::filesystem::path& destination) {
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#ifdef _WIN32
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return ::MoveFileExW(source.c_str(), destination.c_str(),
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MOVEFILE_REPLACE_EXISTING | MOVEFILE_WRITE_THROUGH) != 0;
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#else
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std::error_code error;
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std::filesystem::rename(source, destination, error);
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return !error;
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#endif
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}
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inline bool replace_file(const std::filesystem::path& path, const void* data, std::size_t size) {
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return replace_file_with(path, data, size, [](const auto& temporary, const auto& destination) {
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return move_replacing(temporary, destination);
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});
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}
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}
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