mirror of
https://github.com/f4exb/sdrangel.git
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152 lines
4.2 KiB
C++
152 lines
4.2 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2019 F4EXB //
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// written by Edouard Griffiths //
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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 as version 3 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 V3 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, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#include <QString>
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#include "hbfilterchainconverter.h"
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double HBFilterChainConverter::convertToIndexes(unsigned int log2, unsigned int chainHash, std::vector<unsigned int>& chainIndexes)
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{
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chainIndexes.clear();
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if (log2 == 0) {
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return 0.0;
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}
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unsigned int s = 1;
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unsigned int u = chainHash;
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for (unsigned int i = 0; i < log2; i++) {
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s *= 3;
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}
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u %= s; // scale
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unsigned int ix = log2;
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double shift = 0.0;
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double shift_stage = 1.0 / (1<<(log2+1));
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// base3 conversion
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do
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{
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int r = u % 3;
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chainIndexes.push_back(r);
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shift += (r-1)*shift_stage;
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shift_stage *= 2;
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u /= 3;
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ix--;
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} while (u);
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// continue shift with leading zeroes. ix has the number of leading zeroes.
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for (unsigned int i = 0; i < ix; i++)
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{
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chainIndexes.push_back(0);
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shift -= shift_stage;
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shift_stage *= 2;
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}
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return shift;
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}
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double HBFilterChainConverter::convertToString(unsigned int log2, unsigned int chainHash, QString& chainString)
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{
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if (log2 == 0)
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{
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chainString = "C";
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return 0.0;
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}
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unsigned int s = 1;
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unsigned int u = chainHash;
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chainString = "";
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for (unsigned int i = 0; i < log2; i++) {
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s *= 3;
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}
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u %= s; // scale
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unsigned int ix = log2;
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double shift = 0.0;
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double shift_stage = 1.0 / (1<<(log2+1));
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// base3 conversion
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do
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{
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int r = u % 3;
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if (r == 0) {
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chainString = "L" + chainString;
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} else if (r == 1) {
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chainString = "C" + chainString;
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} else if (r == 2) {
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chainString = "H" + chainString;
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}
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shift += (r-1)*shift_stage;
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shift_stage *= 2;
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u /= 3;
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ix--;
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} while (u);
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// continue shift with leading zeroes. ix has the number of leading zeroes.
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for (unsigned int i = 0; i < ix; i++)
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{
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chainString = "L" + chainString;
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shift -= shift_stage;
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shift_stage *= 2;
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}
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return shift;
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}
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double HBFilterChainConverter::getShiftFactor(unsigned int log2, unsigned int chainHash)
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{
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if (log2 == 0)
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{
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return 0.0;
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}
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unsigned int s = 1;
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unsigned int u = chainHash;
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for (unsigned int i = 0; i < log2; i++) {
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s *= 3;
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}
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u %= s; // scale
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unsigned int ix = log2;
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double shift = 0.0;
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double shift_stage = 1.0 / (1<<(log2+1));
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// base3 conversion
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do
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{
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int r = u % 3;
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shift += (r-1)*shift_stage;
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shift_stage *= 2;
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u /= 3;
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ix--;
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} while (u);
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// continue shift with leading zeroes. ix has the number of leading zeroes.
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for (unsigned int i = 0; i < ix; i++)
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{
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shift -= shift_stage;
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shift_stage *= 2;
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}
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return shift;
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} |