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87 lines
1.8 KiB
C++
87 lines
1.8 KiB
C++
#pragma once
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#include <functional>
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#include <set>
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#ifdef USE_GHC_FILESYSTEM
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#include <ghc/filesystem.hpp>
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namespace fs = ghc::filesystem;
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#else
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#include <filesystem>
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namespace fs
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{
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using namespace std::filesystem;
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using ifstream = std::ifstream;
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using ofstream = std::ofstream;
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using fstream = std::fstream;
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} // namespace fs
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#endif
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#ifndef _MSC_VER
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#include <dirent.h>
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#endif
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#include <optional>
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namespace llarp
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{
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namespace util
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{
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struct FileHash
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{
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size_t
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operator()(const fs::path& f) const
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{
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std::hash<std::string> h;
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return h(f.string());
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}
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};
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using error_code_t = std::error_code;
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/// Ensure that a file exists and has correct permissions
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/// return any error code or success
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error_code_t
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EnsurePrivateFile(fs::path pathname);
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/// open a stream to a file and ensure it exists before open
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/// sets any permissions on creation
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template <typename T>
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std::optional<T>
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OpenFileStream(fs::path pathname, std::ios::openmode mode)
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{
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if (EnsurePrivateFile(pathname))
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return {};
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return std::make_optional<T>(pathname, mode);
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}
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template <typename PathVisitor>
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static void
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IterDir(const fs::path& path, PathVisitor visit)
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{
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DIR* d = opendir(path.string().c_str());
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if (d == nullptr)
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return;
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struct dirent* ent = nullptr;
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std::set<fs::path> entries;
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do
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{
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ent = readdir(d);
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if (not ent)
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break;
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if (ent->d_name[0] == '.')
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continue;
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entries.emplace(path / fs::path{ent->d_name});
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} while (ent);
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closedir(d);
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for (const auto& p : entries)
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{
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if (not visit(p))
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return;
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}
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};
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} // namespace util
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} // namespace llarp
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