mirror of
https://github.com/transmission/transmission
synced 2024-12-23 00:04:06 +00:00
106 lines
3.2 KiB
C++
106 lines
3.2 KiB
C++
// This file Copyright © 2017-2022 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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#include <array>
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#include <cstddef> // size_t
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#include <cstdint> // uint32_t
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// ---
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#ifdef _MSVC_LANG
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#define TR_CPLUSPLUS _MSVC_LANG
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#else
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#define TR_CPLUSPLUS __cplusplus
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#endif
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#if ((TR_CPLUSPLUS >= 202002L) && (!defined(_GLIBCXX_RELEASE) || _GLIBCXX_RELEASE > 9)) || \
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(TR_CPLUSPLUS >= 201709L && TR_GCC_VERSION >= 1002)
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#define TR_CONSTEXPR20 constexpr
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#else
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#define TR_CONSTEXPR20
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#endif
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// Placeholder for future use.
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// Can't implement right now because __cplusplus version for C++23 is currently TBD
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#define TR_CONSTEXPR23
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// ---
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#ifndef __has_builtin
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#define __has_builtin(x) 0
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#endif
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#ifdef _WIN32
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#define TR_IF_WIN32(ThenValue, ElseValue) ThenValue
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#else
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#define TR_IF_WIN32(ThenValue, ElseValue) ElseValue
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#endif
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#ifdef __GNUC__
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#define TR_GNUC_CHECK_VERSION(major, minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
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#else
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#define TR_GNUC_CHECK_VERSION(major, minor) 0
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#endif
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#ifdef __UCLIBC__
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#define TR_UCLIBC_CHECK_VERSION(major, minor, micro) \
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(__UCLIBC_MAJOR__ > (major) || (__UCLIBC_MAJOR__ == (major) && __UCLIBC_MINOR__ > (minor)) || \
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(__UCLIBC_MAJOR__ == (major) && __UCLIBC_MINOR__ == (minor) && __UCLIBC_SUBLEVEL__ >= (micro)))
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#else
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#define TR_UCLIBC_CHECK_VERSION(major, minor, micro) 0
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#endif
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// ---
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#if __has_builtin(__builtin_expect) || TR_GNUC_CHECK_VERSION(3, 0)
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#define TR_LIKELY(x) __builtin_expect((x) ? 1L : 0L, 1L)
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#define TR_UNLIKELY(x) __builtin_expect((x) ? 1L : 0L, 0L)
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#else
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#define TR_LIKELY(x) (x)
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#define TR_UNLIKELY(x) (x)
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#endif
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#define TR_DISABLE_COPY_MOVE(Class) \
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Class& operator=(Class const&) = delete; \
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Class& operator=(Class&&) = delete; \
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Class(Class const&) = delete; \
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Class(Class&&) = delete;
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// ---
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#define TR_PATH_DELIMITER '/'
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#define TR_INET6_ADDRSTRLEN 46
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#define TR_ADDRSTRLEN 64
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// Mostly to enforce better formatting
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#define TR_ARG_TUPLE(...) __VA_ARGS__
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// https://www.bittorrent.org/beps/bep_0007.html
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// "The client SHOULD include a key parameter in its announces. The key
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// should remain the same for a particular infohash during a torrent
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// session. Together with the peer_id this allows trackers to uniquely
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// identify clients for the purpose of statistics-keeping when they
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// announce from multiple IP.
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// The key should be generated so it has at least 32bits worth of entropy."
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//
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// https://www.bittorrent.org/beps/bep_0015.html
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// "Clients that resolve hostnames to v4 and v6 and then announce to both
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// should use the same [32-bit integer] key for both so that trackers that
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// care about accurate statistics-keeping can match the two announces."
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using tr_announce_key_t = uint32_t;
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// https://www.bittorrent.org/beps/bep_0003.html
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// A string of length 20 which this downloader uses as its id. Each
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// downloader generates its own id at random at the start of a new
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// download. This value will also almost certainly have to be escaped.
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using tr_peer_id_t = std::array<char, 20>;
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using tr_sha1_digest_t = std::array<std::byte, 20>;
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using tr_sha256_digest_t = std::array<std::byte, 32>;
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