mirror of https://github.com/oxen-io/lokinet
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
104 lines
2.7 KiB
C++
104 lines
2.7 KiB
C++
#pragma once
|
|
#include "fs.hpp"
|
|
|
|
#include <optional>
|
|
#include <set>
|
|
#include <string>
|
|
#include <string_view>
|
|
|
|
#ifndef _MSC_VER
|
|
#include <dirent.h>
|
|
#endif
|
|
|
|
namespace llarp::util
|
|
{
|
|
/// Reads a binary file from disk into a string. Throws on error.
|
|
std::string
|
|
slurp_file(const fs::path& filename);
|
|
|
|
/// Reads a binary file from disk directly into a buffer. Throws a std::length_error if the
|
|
/// file is bigger than the buffer. Returns the bytes copied on success.
|
|
size_t
|
|
slurp_file(const fs::path& filename, char* buffer, size_t buffer_size);
|
|
|
|
/// Same, but for some non-char but single-byte char type (e.g. byte_t, std::byte, unsigned char).
|
|
template <
|
|
typename Char,
|
|
std::enable_if_t<sizeof(Char) == 1 and not std::is_same_v<Char, char>, int> = 1>
|
|
inline size_t
|
|
slurp_file(const fs::path& filename, Char* buffer, size_t buffer_size)
|
|
{
|
|
return slurp_file(filename, reinterpret_cast<char*>(buffer), buffer_size);
|
|
}
|
|
|
|
/// Dumps binary string contents to disk. The file is overwritten if it already exists. Throws
|
|
/// on error.
|
|
void
|
|
dump_file(const fs::path& filename, std::string_view contents);
|
|
|
|
/// Same as above, but works via char-like buffer
|
|
template <typename Char, std::enable_if_t<sizeof(Char) == 1, int> = 0>
|
|
inline void
|
|
dump_file(const fs::path& filename, const Char* buffer, size_t buffer_size)
|
|
{
|
|
return dump_file(
|
|
filename, std::string_view{reinterpret_cast<const char*>(buffer), buffer_size});
|
|
}
|
|
|
|
struct FileHash
|
|
{
|
|
size_t
|
|
operator()(const fs::path& f) const
|
|
{
|
|
std::hash<std::string> h;
|
|
return h(f.string());
|
|
}
|
|
};
|
|
|
|
using error_code_t = std::error_code;
|
|
|
|
/// Ensure that a file exists and has correct permissions
|
|
/// return any error code or success
|
|
error_code_t
|
|
EnsurePrivateFile(fs::path pathname);
|
|
|
|
/// open a stream to a file and ensure it exists before open
|
|
/// sets any permissions on creation
|
|
template <typename T>
|
|
std::optional<T>
|
|
OpenFileStream(fs::path pathname, std::ios::openmode mode)
|
|
{
|
|
if (EnsurePrivateFile(pathname))
|
|
return {};
|
|
return std::make_optional<T>(pathname, mode);
|
|
}
|
|
|
|
template <typename PathVisitor>
|
|
static void
|
|
IterDir(const fs::path& path, PathVisitor visit)
|
|
{
|
|
DIR* d = opendir(path.string().c_str());
|
|
if (d == nullptr)
|
|
return;
|
|
struct dirent* ent = nullptr;
|
|
std::set<fs::path> entries;
|
|
do
|
|
{
|
|
ent = readdir(d);
|
|
if (not ent)
|
|
break;
|
|
if (ent->d_name[0] == '.')
|
|
continue;
|
|
entries.emplace(path / fs::path{ent->d_name});
|
|
} while (ent);
|
|
closedir(d);
|
|
|
|
for (const auto& p : entries)
|
|
{
|
|
if (not visit(p))
|
|
return;
|
|
}
|
|
}
|
|
|
|
} // namespace llarp::util
|