2016-05-03 14:29:27 +02:00
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/*
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Copyright (c) 2016, Arvid Norberg
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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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#include "libtorrent/sha1_hash.hpp"
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#include "libtorrent/aux_/cpuid.hpp"
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2016-05-23 14:15:39 +02:00
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#include "libtorrent/hex.hpp" // to_hex, from_hex
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2016-06-06 05:55:42 +02:00
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#if TORRENT_USE_IOSTREAM
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2016-05-23 14:15:39 +02:00
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#include <iostream>
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#include <iomanip>
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2016-06-06 05:55:42 +02:00
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#endif // TORRENT_USE_IOSTREAM
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2016-05-03 14:29:27 +02:00
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namespace libtorrent
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{
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2016-06-06 05:55:42 +02:00
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#if TORRENT_USE_IOSTREAM
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2016-05-23 14:15:39 +02:00
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// print a sha1_hash object to an ostream as 40 hexadecimal digits
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std::ostream& operator<<(std::ostream& os, sha1_hash const& peer)
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{
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char out[sha1_hash::size * 2 + 1];
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2016-06-04 16:01:43 +02:00
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aux::to_hex(peer.data(), sha1_hash::size, out);
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2016-05-23 14:15:39 +02:00
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return os << out;
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}
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// read 40 hexadecimal digits from an istream into a sha1_hash
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std::istream& operator>>(std::istream& is, sha1_hash& peer)
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{
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2016-06-04 16:01:43 +02:00
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char hex[sha1_hash::size * 2];
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is.read(hex, sha1_hash::size * 2);
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if (!aux::from_hex(hex, sha1_hash::size * 2, peer.data()))
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2016-05-23 14:15:39 +02:00
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is.setstate(std::ios_base::failbit);
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return is;
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}
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2016-06-06 05:55:42 +02:00
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#endif // TORRENT_USE_IOSTREAM
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2016-05-03 14:29:27 +02:00
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int sha1_hash::count_leading_zeroes() const
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{
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int ret = 0;
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for (int i = 0; i < number_size; ++i)
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{
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2016-06-18 20:01:38 +02:00
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std::uint32_t v = aux::network_to_host(m_number[i]);
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2016-05-03 14:29:27 +02:00
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if (v == 0)
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{
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ret += 32;
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continue;
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}
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#if TORRENT_HAS_SSE
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if (aux::mmx_support)
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{
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#ifdef __GNUC__
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return ret + __builtin_clz(v);
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#else
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DWORD pos;
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_BitScanReverse(&pos, v);
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return ret + 31 - pos;
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#endif
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}
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#else
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// http://graphics.stanford.edu/~seander/bithacks.html#IntegerLogObvious
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static const int MultiplyDeBruijnBitPosition[32] =
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{
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0, 9, 1, 10, 13, 21, 2, 29, 11, 14, 16, 18, 22, 25, 3, 30,
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8, 12, 20, 28, 15, 17, 24, 7, 19, 27, 23, 6, 26, 5, 4, 31
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};
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v |= v >> 1; // first round down to one less than a power of 2
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v |= v >> 2;
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v |= v >> 4;
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v |= v >> 8;
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v |= v >> 16;
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return ret + MultiplyDeBruijnBitPosition[
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2016-06-18 20:01:38 +02:00
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static_cast<std::uint32_t>(v * 0x07C4ACDDU) >> 27];
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2016-05-03 14:29:27 +02:00
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#endif
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}
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return ret;
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}
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sha1_hash& sha1_hash::operator<<=(int n)
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{
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TORRENT_ASSERT(n >= 0);
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const int num_words = n / 32;
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if (num_words >= number_size)
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{
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std::memset(m_number, 0, size);
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return *this;
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}
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if (num_words > 0)
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{
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std::memmove(m_number, m_number + num_words
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2016-06-18 20:01:38 +02:00
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, (number_size - num_words) * sizeof(std::uint32_t));
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2016-05-03 14:29:27 +02:00
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std::memset(m_number + (number_size - num_words)
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2016-06-18 20:01:38 +02:00
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, 0, num_words * sizeof(std::uint32_t));
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2016-05-03 14:29:27 +02:00
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n -= num_words * 32;
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}
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if (n > 0)
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{
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// keep in mind that the uint32_t are stored in network
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// byte order, so they have to be byteswapped before
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// applying the shift operations, and then byteswapped
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// back again.
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m_number[0] = aux::network_to_host(m_number[0]);
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for (int i = 0; i < number_size - 1; ++i)
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{
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m_number[i] <<= n;
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m_number[i+1] = aux::network_to_host(m_number[i+1]);
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m_number[i] |= m_number[i+1] >> (32 - n);
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m_number[i] = aux::host_to_network(m_number[i]);
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}
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m_number[number_size-1] <<= n;
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m_number[number_size-1] = aux::host_to_network(m_number[number_size-1]);
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}
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return *this;
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}
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sha1_hash& sha1_hash::operator>>=(int n)
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{
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TORRENT_ASSERT(n >= 0);
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const int num_words = n / 32;
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if (num_words >= number_size)
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{
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std::memset(m_number, 0, size_t(size));
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return *this;
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}
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if (num_words > 0)
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{
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std::memmove(m_number + num_words
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2016-06-18 20:01:38 +02:00
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, m_number, (number_size - num_words) * sizeof(std::uint32_t));
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std::memset(m_number, 0, num_words * sizeof(std::uint32_t));
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2016-05-03 14:29:27 +02:00
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n -= num_words * 32;
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}
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if (n > 0)
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{
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// keep in mind that the uint32_t are stored in network
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// byte order, so they have to be byteswapped before
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// applying the shift operations, and then byteswapped
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// back again.
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m_number[number_size-1] = aux::network_to_host(m_number[number_size-1]);
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for (int i = number_size - 1; i > 0; --i)
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{
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m_number[i] >>= n;
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m_number[i-1] = aux::network_to_host(m_number[i-1]);
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m_number[i] |= (m_number[i-1] << (32 - n)) & 0xffffffff;
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m_number[i] = aux::host_to_network(m_number[i]);
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}
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m_number[0] >>= n;
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m_number[0] = aux::host_to_network(m_number[0]);
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}
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return *this;
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}
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}
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