mirror of https://github.com/aria2/aria2
71 lines
2.4 KiB
C++
71 lines
2.4 KiB
C++
/* <!-- copyright */
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/*
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* aria2 - The high speed download utility
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*
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* Copyright (C) 2006 Tatsuhiro Tsujikawa
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of portions of this program with the
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* OpenSSL library under certain conditions as described in each
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* individual source file, and distribute linked combinations
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* including the two.
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* You must obey the GNU General Public License in all respects
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* for all of the code used other than OpenSSL. If you modify
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* file(s) with this exception, you may extend this exception to your
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* version of the file(s), but you are not obligated to do so. If you
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* do not wish to do so, delete this exception statement from your
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* version. If you delete this exception statement from all source
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* files in the program, then also delete it here.
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*/
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/* copyright --> */
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#include "RarestPieceSelector.h"
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#include <limits>
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#include <algorithm>
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#include "PieceStatMan.h"
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#include "bitfield.h"
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namespace aria2 {
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RarestPieceSelector::RarestPieceSelector
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(const SharedHandle<PieceStatMan>& pieceStatMan):pieceStatMan_(pieceStatMan) {}
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bool RarestPieceSelector::select
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(size_t& index, const unsigned char* bitfield, size_t nbits) const
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{
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const std::vector<size_t>& order = pieceStatMan_->getOrder();
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const std::vector<int>& counts = pieceStatMan_->getCounts();
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int min = std::numeric_limits<int>::max();
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size_t bestIdx = nbits;
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for(size_t i = 0; i < nbits; ++i) {
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size_t idx = order[i];
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if(bitfield::test(bitfield, nbits, idx) && counts[idx] < min) {
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min = counts[idx];
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bestIdx = idx;
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}
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}
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if(bestIdx == nbits) {
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return false;
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} else {
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index = bestIdx;
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return true;
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}
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}
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} // namespace aria2
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