mirror of https://github.com/aria2/aria2
72 lines
2.7 KiB
C++
72 lines
2.7 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) 2011 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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#ifndef D_STREAM_PIECE_SELECTOR_H
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#define D_STREAM_PIECE_SELECTOR_H
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#include "common.h"
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#include <cstdlib>
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namespace aria2 {
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// Select piece for HTTP/FTP download. For BitTorrent downloads, use
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// PieceSelector interface.
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class StreamPieceSelector {
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public:
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virtual ~StreamPieceSelector() {}
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// Selected piece index will be stored in index. To ignore some
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// piece indexes from selection, use ignoreBitfield and set
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// corresponding bit. length is the number of byte of
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// ignoreBitfield. The number of bits in ignoreBitfield must be
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// equal to the number of blocks in BitfieldMan. If piece index is
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// selected, returns true. Otherwise, returns false. minSplitSize
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// is a advice to derived class not to select piece such which the
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// distance between it and already selected piece is less than
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// minSplitSize.
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virtual bool select
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(size_t& index,
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size_t minSplitSize,
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const unsigned char* ignoreBitfield,
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size_t length) = 0;
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// Called when initial bitfield was fixed. Optimize
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// StreamPieceSelector to take advantages of the initial bitfield.
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virtual void onBitfieldInit() = 0;
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};
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} // namespace aria2
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#endif // D_STREAM_PIECE_SELECTOR_H
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