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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2025
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#pragma once
#include "td/utils/common.h"
#include "td/utils/port/FileFd.h"
#include "td/utils/Slice.h"
#include "td/utils/Status.h"
namespace td {
class MemoryMapping {
public:
struct Options {
int64 offset{0};
int64 size{-1};
Options() {
}
Options &with_offset(int64 new_offset) {
offset = new_offset;
return *this;
}
Options &with_size(int64 new_size) {
size = new_size;
return *this;
}
};
static Result<MemoryMapping> create_anonymous(const Options &options = {});
static Result<MemoryMapping> create_from_file(const FileFd &file, const Options &options = {});
Slice as_slice() const;
MutableSlice as_mutable_slice(); // returns empty slice if memory is read-only
MemoryMapping(const MemoryMapping &) = delete;
MemoryMapping &operator=(const MemoryMapping &) = delete;
MemoryMapping(MemoryMapping &&other) noexcept;
MemoryMapping &operator=(MemoryMapping &&other) noexcept;
~MemoryMapping();
private:
class Impl;
unique_ptr<Impl> impl_;
explicit MemoryMapping(unique_ptr<Impl> impl);
};
} // namespace td
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