mirror of https://github.com/aria2/aria2
123 lines
3.4 KiB
C++
123 lines
3.4 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 "SpeedCalc.h"
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#include <algorithm>
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#include <ostream>
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#include <iterator>
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#define CHANGE_INTERVAL_SEC 15
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class Reset {
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public:
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void operator()(Time& tm) {
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tm.reset();
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}
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};
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void SpeedCalc::reset() {
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fill(&lengthArray[0], &lengthArray[2], 0);
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for_each(&cpArray[0], &cpArray[2], Reset());
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sw = 0;
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maxSpeed = 0;
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prevSpeed = 0;
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start.reset();
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accumulatedLength = 0;
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nextInterval = CHANGE_INTERVAL_SEC;
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}
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int32_t SpeedCalc::calculateSpeed() {
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int32_t milliElapsed = cpArray[sw].differenceInMillis();
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if(milliElapsed) {
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int32_t speed = lengthArray[sw]*1000/milliElapsed;
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prevSpeed = speed;
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maxSpeed = max<int32_t>(speed, maxSpeed);
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return speed;
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} else {
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return prevSpeed;
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}
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}
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int32_t SpeedCalc::calculateSpeed(const struct timeval& now) {
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int64_t milliElapsed = cpArray[sw].differenceInMillis(now);
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if(milliElapsed) {
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int32_t speed = lengthArray[sw]*1000/milliElapsed;
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prevSpeed = speed;
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maxSpeed = max<int32_t>(speed, maxSpeed);
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return speed;
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} else {
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return prevSpeed;
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}
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}
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class Plus {
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private:
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int32_t d;
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public:
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Plus(int32_t d):d(d) {}
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void operator()(int64_t& length) {
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length += d;
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}
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};
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void SpeedCalc::update(int bytes) {
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accumulatedLength += bytes;
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for_each(&lengthArray[0], &lengthArray[2], Plus(bytes));
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if(isIntervalOver()) {
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changeSw();
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}
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}
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bool SpeedCalc::isIntervalOver() const {
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return nextInterval <= cpArray[sw].difference();
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}
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void SpeedCalc::changeSw() {
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lengthArray[sw] = 0;
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cpArray[sw].reset();
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sw ^= 0x01;
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nextInterval = cpArray[sw].difference()+CHANGE_INTERVAL_SEC;
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}
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int32_t SpeedCalc::getAvgSpeed() const {
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int32_t milliElapsed = start.differenceInMillis();
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if(milliElapsed) {
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int32_t speed = accumulatedLength*1000/milliElapsed;
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return speed;
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} else {
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return 0;
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}
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}
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