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// Copyright (c) 2020 Egor Tensin <Egor.Tensin@gmail.com>
// This file is part of the "winapi-common" project.
// For details, see https://github.com/egor-tensin/winapi-common.
// Distributed under the MIT License.
#pragma once
#include "handle.hpp"
#include "path.hpp"
#include <boost/functional/hash.hpp>
#include <windows.h>
#include <cstddef>
#include <functional>
#include <string>
#include <utility>
namespace winapi {
bool operator==(const FILE_ID_128& a, const FILE_ID_128& b);
/**
* @brief File I/O.
*
* Easily open, read & write files.
*/
class File : public Handle {
public:
struct ID {
const FILE_ID_INFO impl;
bool operator==(const ID& other) const {
return impl.VolumeSerialNumber == other.impl.VolumeSerialNumber &&
impl.FileId == other.impl.FileId;
}
};
/** Open file for reading. */
static File open_r(const std::string&);
/** @overload */
static File open_r(const CanonicalPath&);
/** Open file for reading (inc. ability to read its attributes). */
static File open_read_attributes(const std::string&);
/** @overload */
static File open_read_attributes(const CanonicalPath&);
/** Open file for writing. */
static File open_w(const std::string&);
/** @overload */
static File open_w(const CanonicalPath&);
/** Delete a file. */
static void remove(const std::string&);
/** @overload */
static void remove(const CanonicalPath&);
/** Make a File instance from an open handle. */
explicit File(Handle&& handle) : Handle{std::move(handle)} {}
/**
* Get file size.
* @return File size, bytes.
*/
std::size_t get_size() const;
/**
* Get file ID.
* File ID is a unique representation of a file, suitable for hashing.
*/
ID query_id() const;
};
} // namespace winapi
namespace std {
template <>
struct hash<winapi::File::ID> {
std::size_t operator()(const winapi::File::ID& id) const {
std::size_t seed = 0;
boost::hash_combine(seed, id.impl.VolumeSerialNumber);
boost::hash_combine(seed, id.impl.FileId.Identifier);
return seed;
}
};
} // namespace std
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