150 lines
3.7 KiB
C++
150 lines
3.7 KiB
C++
// This file Copyright © 2021-2022 Mnemosyne LLC.
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// It may be used under GPLv2 (SPDX: GPL-2.0), GPLv3 (SPDX: GPL-3.0),
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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 <vector>
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#include "transmission.h"
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#include "bitfield.h"
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struct tr_block_info;
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struct tr_torrent_metainfo;
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class tr_file_piece_map
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{
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public:
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template<typename T>
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struct index_span_t
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{
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T begin;
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T end;
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};
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using file_span_t = index_span_t<tr_file_index_t>;
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using piece_span_t = index_span_t<tr_piece_index_t>;
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template<typename T>
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struct offset_t
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{
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T index;
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uint64_t offset;
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};
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using file_offset_t = offset_t<tr_file_index_t>;
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explicit tr_file_piece_map(tr_torrent_metainfo const& tm)
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{
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reset(tm);
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}
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tr_file_piece_map(tr_block_info const& block_info, uint64_t const* file_sizes, size_t n_files)
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{
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reset(block_info, file_sizes, n_files);
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}
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void reset(tr_block_info const& block_info, uint64_t const* file_sizes, size_t n_files);
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void reset(tr_torrent_metainfo const& tm);
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[[nodiscard]] piece_span_t pieceSpan(tr_file_index_t file) const;
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[[nodiscard]] file_span_t fileSpan(tr_piece_index_t piece) const;
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[[nodiscard]] file_offset_t fileOffset(uint64_t offset) const;
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[[nodiscard]] size_t size() const
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{
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return std::size(file_pieces_);
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}
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// TODO(ckerr) minor wart here, two identical span types
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[[nodiscard]] tr_byte_span_t byteSpan(tr_file_index_t file) const
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{
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auto const& span = file_bytes_.at(file);
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return tr_byte_span_t{ span.begin, span.end };
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}
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private:
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using byte_span_t = index_span_t<uint64_t>;
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std::vector<byte_span_t> file_bytes_;
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std::vector<piece_span_t> file_pieces_;
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template<typename T>
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struct CompareToSpan
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{
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using span_t = index_span_t<T>;
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int compare(T item, span_t span) const // <=>
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{
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if (item < span.begin)
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{
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return -1;
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}
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if (item >= span.end)
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{
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return 1;
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}
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return 0;
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}
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bool operator()(T item, span_t span) const // <
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{
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return compare(item, span) < 0;
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}
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int compare(span_t span, T item) const // <=>
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{
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return -compare(item, span);
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}
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bool operator()(span_t span, T item) const // <
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{
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return compare(span, item) < 0;
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}
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};
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};
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class tr_file_priorities
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{
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public:
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explicit tr_file_priorities(tr_file_piece_map const* fpm);
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void reset(tr_file_piece_map const*);
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void set(tr_file_index_t file, tr_priority_t priority);
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void set(tr_file_index_t const* files, size_t n, tr_priority_t priority);
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[[nodiscard]] tr_priority_t filePriority(tr_file_index_t file) const;
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[[nodiscard]] tr_priority_t piecePriority(tr_piece_index_t piece) const;
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private:
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tr_file_piece_map const* fpm_;
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std::vector<tr_priority_t> priorities_;
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};
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class tr_files_wanted
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{
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public:
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explicit tr_files_wanted(tr_file_piece_map const* fpm)
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: wanted_(std::size(*fpm))
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{
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reset(fpm);
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}
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void reset(tr_file_piece_map const* fpm);
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void set(tr_file_index_t file, bool wanted);
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void set(tr_file_index_t const* files, size_t n, bool wanted);
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[[nodiscard]] bool fileWanted(tr_file_index_t file) const;
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[[nodiscard]] bool pieceWanted(tr_piece_index_t piece) const;
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private:
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tr_file_piece_map const* fpm_;
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tr_bitfield wanted_;
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};
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