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77 lines
2.1 KiB
C++
77 lines
2.1 KiB
C++
#pragma once
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#include "fs.hpp"
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#include <optional>
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#include <set>
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#include <string>
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#include <string_view>
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#ifndef _MSC_VER
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#include <dirent.h>
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#endif
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namespace llarp::util
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{
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/// Reads a binary file from disk into a string. Throws on error.
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std::string
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file_to_string(const fs::path& filename);
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/// Reads a binary file from disk directly into a buffer. Throws a std::length_error if the
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/// file is bigger than the buffer. Returns the bytes copied on success.
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size_t
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file_to_buffer(const fs::path& filename, char* buffer, size_t buffer_size);
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/// Same, but for some non-char but single-byte char type (e.g. byte_t, std::byte, unsigned char).
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template <
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typename Char,
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std::enable_if_t<sizeof(Char) == 1 and not std::is_same_v<Char, char>, int> = 1>
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size_t
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file_to_buffer(const fs::path& filename, Char* buffer, size_t buffer_size)
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{
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return file_to_buffer(filename, reinterpret_cast<char*>(buffer), buffer_size);
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}
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/// Dumps binary string contents to disk. The file is overwritten if it already exists. Throws
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/// on error.
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void
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buffer_to_file(const fs::path& filename, std::string_view contents);
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/// Same as above, but works via char-like buffer
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template <typename Char, std::enable_if_t<sizeof(Char) == 1, int> = 0>
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void
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buffer_to_file(const fs::path& filename, const Char* buffer, size_t buffer_size)
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{
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return buffer_to_file(
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filename, std::string_view{reinterpret_cast<const char*>(buffer), buffer_size});
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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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} // namespace llarp::util
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