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62 lines
1.8 KiB
62 lines
1.8 KiB
/*
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* Copyright (C) 2021-2022 by Geoffrey Merck F4FXL / KC3FRA
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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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <boost/algorithm/string.hpp>
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#include "APRSUtils.h"
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void CAPRSUtils::dstarCallsignToAPRS(std::string& dstarCallsign)
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{
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if(dstarCallsign[dstarCallsign.length() - 1] == ' ') {
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boost::trim(dstarCallsign);
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} else {
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//loop until got rid of all double blanks
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while(dstarCallsign.find(" ") != std::string::npos) {
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boost::replace_all(dstarCallsign, " ", " ");
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}
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boost::replace_all(dstarCallsign, " ", "-");//replace remaining blank with a -
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}
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}
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unsigned int CAPRSUtils::calcGPSAIcomCRC(const std::string& gpsa)
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{
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unsigned int icomcrc = 0xFFFFU;
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unsigned int dataBegin = 0U;
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if(boost::starts_with(gpsa, "$$CRC") && gpsa.length() >= 10 && gpsa[9] == ',')
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dataBegin = 10U;
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auto length = gpsa.length();
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for (unsigned int j = dataBegin; j < length; j++) {
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unsigned char ch = (unsigned char)gpsa[j];
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for (unsigned int i = 0U; i < 8U; i++) {
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bool xorflag = (((icomcrc ^ ch) & 0x01U) == 0x01U);
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icomcrc >>= 1;
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if (xorflag)
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icomcrc ^= 0x8408U;
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ch >>= 1;
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}
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}
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return ~icomcrc & 0xFFFFU;
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}
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