transmission/libtransmission/torrent-metainfo.h

246 lines
7.0 KiB
C++

// This file Copyright © 2005-2022 Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#pragma once
#include <cstdint> // uint32_t, uint64_t
#include <ctime>
#include <string>
#include <string_view>
#include <vector>
#include "transmission.h"
#include "block-info.h"
#include "magnet-metainfo.h"
#include "torrent-files.h"
#include "tr-strbuf.h"
struct tr_error;
struct tr_torrent_metainfo : public tr_magnet_metainfo
{
public:
[[nodiscard]] TR_CONSTEXPR20 auto empty() const noexcept
{
return std::empty(files_);
}
bool parseBenc(std::string_view benc, tr_error** error = nullptr);
// Helper function wrapper around parseBenc().
// If you're looping through several files, passing in a non-nullptr
// `buffer` can reduce the number of memory allocations needed to
// load multiple files.
bool parseTorrentFile(std::string_view benc_filename, std::vector<char>* contents = nullptr, tr_error** error = nullptr);
// FILES
[[nodiscard]] constexpr auto const& files() const noexcept
{
return files_;
}
[[nodiscard]] TR_CONSTEXPR20 auto fileCount() const noexcept
{
return files().fileCount();
}
[[nodiscard]] TR_CONSTEXPR20 auto fileSize(tr_file_index_t i) const
{
return files().fileSize(i);
}
[[nodiscard]] TR_CONSTEXPR20 auto const& fileSubpath(tr_file_index_t i) const
{
return files().path(i);
}
void setFileSubpath(tr_file_index_t i, std::string_view subpath)
{
files_.setPath(i, subpath);
}
/// BLOCK INFO
[[nodiscard]] constexpr auto const& blockInfo() const noexcept
{
return block_info_;
}
[[nodiscard]] constexpr auto blockCount() const noexcept
{
return blockInfo().blockCount();
}
[[nodiscard]] constexpr auto byteLoc(uint64_t nth_byte) const noexcept
{
return blockInfo().byteLoc(nth_byte);
}
[[nodiscard]] constexpr auto blockLoc(tr_block_index_t block) const noexcept
{
return blockInfo().blockLoc(block);
}
[[nodiscard]] constexpr auto pieceLoc(tr_piece_index_t piece, uint32_t offset = 0, uint32_t length = 0) const noexcept
{
return blockInfo().pieceLoc(piece, offset, length);
}
[[nodiscard]] constexpr auto blockSize(tr_block_index_t block) const noexcept
{
return blockInfo().blockSize(block);
}
[[nodiscard]] constexpr auto blockSpanForPiece(tr_piece_index_t piece) const noexcept
{
return blockInfo().blockSpanForPiece(piece);
}
[[nodiscard]] constexpr auto pieceCount() const noexcept
{
return blockInfo().pieceCount();
}
[[nodiscard]] constexpr auto pieceSize() const noexcept
{
return blockInfo().pieceSize();
}
[[nodiscard]] constexpr auto pieceSize(tr_piece_index_t piece) const noexcept
{
return blockInfo().pieceSize(piece);
}
[[nodiscard]] constexpr auto totalSize() const noexcept
{
return blockInfo().totalSize();
}
// OTHER PROPERTIES
[[nodiscard]] constexpr auto const& comment() const noexcept
{
return comment_;
}
[[nodiscard]] constexpr auto const& creator() const noexcept
{
return creator_;
}
[[nodiscard]] constexpr auto const& source() const noexcept
{
return source_;
}
[[nodiscard]] constexpr auto const& isPrivate() const noexcept
{
return is_private_;
}
[[nodiscard]] tr_sha1_digest_t const& pieceHash(tr_piece_index_t piece) const;
[[nodiscard]] TR_CONSTEXPR20 bool hasV1Metadata() const noexcept
{
// need 'pieces' field and 'files' or 'length'
// TODO check for 'files' or 'length'
return !std::empty(pieces_);
}
[[nodiscard]] constexpr bool hasV2Metadata() const noexcept
{
return is_v2_;
}
[[nodiscard]] constexpr auto const& dateCreated() const noexcept
{
return date_created_;
}
[[nodiscard]] constexpr auto infoDictSize() const noexcept
{
return info_dict_size_;
}
[[nodiscard]] constexpr auto infoDictOffset() const noexcept
{
return info_dict_offset_;
}
[[nodiscard]] constexpr auto piecesOffset() const noexcept
{
return pieces_offset_;
}
// UTILS
[[nodiscard]] auto torrentFile(std::string_view torrent_dir) const
{
return makeFilename(torrent_dir, name(), infoHashString(), BasenameFormat::Hash, ".torrent");
}
[[nodiscard]] auto magnetFile(std::string_view torrent_dir) const
{
return makeFilename(torrent_dir, name(), infoHashString(), BasenameFormat::Hash, ".magnet");
}
[[nodiscard]] auto resumeFile(std::string_view resume_dir) const
{
return makeFilename(resume_dir, name(), infoHashString(), BasenameFormat::Hash, ".resume");
}
static bool migrateFile(
std::string_view dirname,
std::string_view name,
std::string_view info_hash_string,
std::string_view suffix);
static void removeFile(
std::string_view dirname,
std::string_view name,
std::string_view info_hash_string,
std::string_view suffix);
private:
friend struct MetainfoHandler;
static bool parseImpl(tr_torrent_metainfo& setme, std::string_view benc, tr_error** error);
// static bool parsePath(std::string_view root, tr_variant* path, std::string& setme);
static std::string fixWebseedUrl(tr_torrent_metainfo const& tm, std::string_view url);
// static std::string_view parseFiles(tr_torrent_metainfo& setme, tr_variant* info_dict, uint64_t* setme_total_size);
// static std::string_view parseAnnounce(tr_torrent_metainfo& setme, tr_variant* meta);
// static void parseWebseeds(tr_torrent_metainfo& setme, tr_variant* meta);
enum class BasenameFormat
{
Hash,
NameAndPartialHash
};
[[nodiscard]] static tr_pathbuf makeFilename(
std::string_view dirname,
std::string_view name,
std::string_view info_hash_string,
BasenameFormat format,
std::string_view suffix);
auto makeFilename(std::string_view dirname, BasenameFormat format, std::string_view suffix) const
{
return makeFilename(dirname, name(), infoHashString(), format, suffix);
}
tr_block_info block_info_ = tr_block_info{ 0, 0 };
tr_torrent_files files_;
std::vector<tr_sha1_digest_t> pieces_;
std::string comment_;
std::string creator_;
std::string source_;
time_t date_created_ = 0;
// Offset + size of the bencoded info dict subset of the bencoded data.
// Used when loading pieces of it to sent to magnet peers.
// See http://bittorrent.org/beps/bep_0009.html
uint64_t info_dict_size_ = 0;
uint64_t info_dict_offset_ = 0;
// Offset of the bencoded 'pieces' checksums subset of the bencoded data.
// Used when loading piece checksums on demand.
uint64_t pieces_offset_ = 0;
bool is_private_ = false;
bool is_v2_ = false;
};