67 lines
2.9 KiB
C++
67 lines
2.9 KiB
C++
/*
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Copyright (c) 2014-2016, Arvid Norberg, Alden Torres
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TORRENT_FFS_HPP_INCLUDE
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#define TORRENT_FFS_HPP_INCLUDE
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#include <cstdint>
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#include "libtorrent/export.hpp"
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#include "libtorrent/span.hpp"
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namespace libtorrent { namespace aux {
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// For a general reference of the problems these routines are about
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// see http://en.wikipedia.org/wiki/Find_first_set
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// these functions expect the range to be in big-endian byte order
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TORRENT_EXTRA_EXPORT int count_leading_zeros_sw(span<std::uint32_t const> buf);
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// if this function is called in an unsupported platform, returns -1
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// consider call always count_leading_zeros(buf)
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TORRENT_EXTRA_EXPORT int count_leading_zeros_hw(span<std::uint32_t const> buf);
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// this function statically determines if hardware or software is used
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// and expect the range to be in big-endian byte order
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TORRENT_EXTRA_EXPORT int count_leading_zeros(span<std::uint32_t const> buf);
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// these functions expect the range to be in big-endian byte order
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TORRENT_EXTRA_EXPORT int count_trailing_ones_sw(span<std::uint32_t const> buf);
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// if this function is called in an unsupported platform, returns -1
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// consider call always count_trailing_ones(buf)
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TORRENT_EXTRA_EXPORT int count_trailing_ones_hw(span<std::uint32_t const> buf);
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// this function statically determines if hardware or software is used
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// and expect the range to be in big-endian byte order
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TORRENT_EXTRA_EXPORT int count_trailing_ones(span<std::uint32_t const> buf);
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}}
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#endif // TORRENT_FFS_HPP_INCLUDE
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