84 lines
2.1 KiB
C++
84 lines
2.1 KiB
C++
// This file Copyright © Mnemosyne LLC.
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// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
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// or any future license endorsed by Mnemosyne LLC.
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// License text can be found in the licenses/ folder.
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#pragma once
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#ifndef __TRANSMISSION__
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#error only libtransmission should #include this header.
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#endif
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#include <cstddef> // size_t
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#include <cstdint> // int64_t
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#include <ctime> // time_t
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#include <deque>
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#include <limits>
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#include <optional>
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#include <string>
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#include <string_view>
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#include <vector>
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#include <small/vector.hpp>
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#include "libtransmission/tr-macros.h"
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// defined by BEP #9
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inline constexpr auto MetadataPieceSize = 1024 * 16;
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using tr_metadata_piece = small::max_size_vector<std::byte, MetadataPieceSize>;
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class tr_metadata_download
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{
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public:
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tr_metadata_download(std::string_view log_name, int64_t size);
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[[nodiscard]] static constexpr auto is_valid_metadata_size(int64_t const size) noexcept
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{
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return size > 0 && size <= std::numeric_limits<int>::max();
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}
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[[nodiscard]] auto is_complete() const noexcept
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{
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return std::empty(pieces_needed_);
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}
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void set_metadata_piece(int64_t piece, void const* data, size_t len);
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[[nodiscard]] std::optional<int64_t> get_next_metadata_request(time_t now) noexcept;
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[[nodiscard]] double get_metadata_percent() const noexcept;
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[[nodiscard]] constexpr auto const& get_metadata() const noexcept
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{
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return metadata_;
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}
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[[nodiscard]] TR_CONSTEXPR20 std::string_view log_name() const noexcept
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{
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return log_name_;
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}
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private:
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struct metadata_node
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{
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time_t requested_at = {};
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int64_t piece = {};
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};
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[[nodiscard]] constexpr size_t get_piece_length(int64_t const piece) const noexcept
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{
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return piece + 1 == piece_count_ ? // last piece
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std::size(metadata_) - (piece * MetadataPieceSize) :
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MetadataPieceSize;
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}
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void create_all_needed(int64_t n_pieces) noexcept;
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std::vector<char> metadata_;
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std::deque<metadata_node> pieces_needed_;
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int64_t piece_count_ = {};
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std::string log_name_;
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};
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