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/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2015 Tatsuhiro Tsujikawa
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
/* copyright --> */
#include "RandomStreamPieceSelector.h"
#include "BitfieldMan.h"
#include "SimpleRandomizer.h"
namespace aria2 {
RandomStreamPieceSelector::RandomStreamPieceSelector(BitfieldMan* bitfieldMan)
: bitfieldMan_(bitfieldMan)
{
}
RandomStreamPieceSelector::~RandomStreamPieceSelector() {}
bool RandomStreamPieceSelector::select(size_t& index, size_t minSplitSize,
const unsigned char* ignoreBitfield,
size_t length)
{
size_t start = SimpleRandomizer::getInstance()->getRandomNumber(
bitfieldMan_->countBlock());
auto rv = bitfieldMan_->getInorderMissingUnusedIndex(
index, start, bitfieldMan_->countBlock(), minSplitSize, ignoreBitfield,
length);
if (rv) {
return true;
}
rv = bitfieldMan_->getInorderMissingUnusedIndex(index, 0, start, minSplitSize,
ignoreBitfield, length);
if (rv) {
return true;
}
// Fall back to inorder search because randomized search may fail
// because of |minSplitSize| constraint.
return bitfieldMan_->getInorderMissingUnusedIndex(index, minSplitSize,
ignoreBitfield, length);
}
void RandomStreamPieceSelector::onBitfieldInit() {}
} // namespace aria2
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