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some work to "ease up" on complexity of file io and hardening, buuuut…
… it's not super pretty yet.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,150 @@ | ||
| /* | ||
| This Source Code Form is subject to the terms of the Mozilla Public | ||
| License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
| */ | ||
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| #pragma once | ||
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| #include <span> | ||
| #include <vector> | ||
| #include <fstream> | ||
| #include <concepts> | ||
| #include <filesystem> | ||
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| #include "Typedefs.hpp" | ||
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| /*==================================================================*/ | ||
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| [[maybe_unused]] | ||
| inline auto getFileModTime( | ||
| const Path& filePath, | ||
| std::error_code* const ioError = nullptr | ||
| ) noexcept { | ||
| std::error_code error; | ||
| const auto modifiedTime{ std::filesystem::last_write_time(filePath, error) }; | ||
| if (error && ioError) { *ioError = error; } | ||
| return modifiedTime; | ||
| } | ||
|
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| [[maybe_unused]] | ||
| inline auto getFileSize( | ||
| const Path& filePath, | ||
| std::error_code* const ioError = nullptr | ||
| ) noexcept { | ||
| std::error_code error; | ||
| const auto fileSize{ std::filesystem::file_size(filePath, error) }; | ||
| if (error && ioError) { *ioError = error; } | ||
| return fileSize; | ||
| } | ||
|
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| [[maybe_unused]] | ||
| inline auto doesPathExist( | ||
| const Path& filePath, | ||
| std::error_code* const ioError = nullptr | ||
| ) noexcept { | ||
| std::error_code error; | ||
|
|
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| // Check if the path doesn't lead anywhere | ||
| if (!std::filesystem::exists(filePath, error) || error) { | ||
| if (ioError) { *ioError = error; } | ||
| return false; | ||
| } else { | ||
| return true; | ||
| } | ||
| } | ||
|
|
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| [[maybe_unused]] | ||
| inline auto doesFileExist( | ||
| const Path& filePath, | ||
| std::error_code* const ioError = nullptr | ||
| ) noexcept { | ||
| std::error_code error; | ||
|
|
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| // Check if the path doesn't lead to a regular file | ||
| if (!std::filesystem::is_regular_file(filePath, error) || error) { | ||
| if (ioError) { *ioError = error; } | ||
| return false; | ||
| } else { | ||
| return true; | ||
| } | ||
| } | ||
|
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| [[maybe_unused]] | ||
| inline auto readFileData( | ||
| const Path& filePath, | ||
| std::error_code* const ioError = nullptr | ||
| ) noexcept { | ||
| std::vector<char> fileData{}; | ||
| std::error_code error; | ||
|
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| // Attempt first file mod time fetch | ||
| const auto fileModStampBegin{ ::getFileModTime(filePath, &error) }; | ||
| if (error) { | ||
| if (ioError) { *ioError = error; } | ||
| fileData.clear(); return fileData; | ||
| } | ||
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| std::ifstream ifs(filePath, std::ios::binary); | ||
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| // Attempt to init file stream | ||
| if (ifs) { | ||
| try { | ||
| // Attempt to read data into vector | ||
| fileData.assign(std::istreambuf_iterator(ifs), {}); | ||
| } catch (const std::exception&) { | ||
| if (ioError) { *ioError = std::make_error_code(std::errc::not_enough_memory); } | ||
| fileData.clear(); return fileData; | ||
| } | ||
| // Check if the stream failed to reach EOF safely | ||
| if (!ifs.good()) { | ||
| if (ioError) { *ioError = std::make_error_code(std::errc::io_error); } | ||
| fileData.clear(); return fileData; | ||
| } | ||
| } else { | ||
| if (ioError) { | ||
| *ioError = std::make_error_code(std::errc::permission_denied); | ||
| fileData.clear(); return fileData; | ||
| } | ||
| } | ||
|
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| // Attempt second file mod time fetch | ||
| const auto fileModStampEnd{ ::getFileModTime(filePath, &error) }; | ||
| if (error) { | ||
| if (ioError) { *ioError = error; } | ||
| fileData.clear(); return fileData; | ||
| } | ||
|
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| // Compare times to ensure no modification occurred during read | ||
| if (fileModStampBegin != fileModStampEnd) { | ||
| if (ioError) { *ioError = std::make_error_code(std::errc::interrupted); } | ||
| fileData.clear(); return fileData; | ||
| } else { | ||
| return fileData; | ||
| } | ||
| } | ||
|
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| template <typename T> [[maybe_unused]] | ||
| inline auto writeFileData( | ||
| const Path& filePath, | ||
| std::span<const T> fileData, | ||
| std::error_code* const ioError = nullptr | ||
| ) noexcept requires std::is_trivially_constructible_v<T> { | ||
| std::ofstream ofs(filePath, std::ios::binary); | ||
|
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| // Attempt to init file stream | ||
| if (ofs) { | ||
| ofs.write(reinterpret_cast<const char*>(fileData.data()), fileData.size() * sizeof(T)); | ||
|
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| // Check if the stream failed to write fully | ||
| if (!ofs.good()) { | ||
| if (ioError) { *ioError = std::make_error_code(std::errc::io_error); } | ||
| return true; | ||
| } else { | ||
| return false; | ||
| } | ||
| } else { | ||
| if (ioError) { *ioError = std::make_error_code(std::errc::permission_denied); } | ||
| return true; | ||
| } | ||
| } |
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