mirror of
https://github.com/g4klx/ircDDBGateway.git
synced 2025-12-06 05:32:02 +01:00
662 lines
14 KiB
C++
662 lines
14 KiB
C++
/*
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* Copyright (C) 2010,2012,2013,2014 by Jonathan Naylor G4KLX
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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 "APRSCollector.h"
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#include "DStarDefines.h"
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#include "Utils.h"
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const unsigned int APRS_CSUM_LENGTH = 4U;
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const unsigned int APRS_DATA_LENGTH = 300U;
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const unsigned int SLOW_DATA_BLOCK_LENGTH = 6U;
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CAPRSCollector::CAPRSCollector() :
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m_state(AS_NONE),
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m_ggaData(NULL),
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m_ggaLength(0U),
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m_ggaValid(false),
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m_rmcData(NULL),
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m_rmcLength(0U),
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m_rmcValid(false),
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m_crcData(NULL),
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m_crcLength(0U),
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m_crcValid(false),
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m_txtData(NULL),
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m_txtLength(0U),
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m_txtValid(false),
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m_buffer(NULL),
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m_slowData(SS_FIRST)
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{
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m_ggaData = new unsigned char[APRS_DATA_LENGTH];
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m_rmcData = new unsigned char[APRS_DATA_LENGTH];
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m_crcData = new unsigned char[APRS_DATA_LENGTH];
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m_txtData = new unsigned char[APRS_DATA_LENGTH];
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m_buffer = new unsigned char[SLOW_DATA_BLOCK_LENGTH];
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}
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CAPRSCollector::~CAPRSCollector()
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{
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delete[] m_ggaData;
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delete[] m_rmcData;
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delete[] m_crcData;
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delete[] m_txtData;
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delete[] m_buffer;
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}
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bool CAPRSCollector::writeData(const unsigned char* data)
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{
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wxASSERT(data != NULL);
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switch (m_slowData) {
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case SS_FIRST:
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m_buffer[0U] = data[0U] ^ SCRAMBLER_BYTE1;
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m_buffer[1U] = data[1U] ^ SCRAMBLER_BYTE2;
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m_buffer[2U] = data[2U] ^ SCRAMBLER_BYTE3;
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m_slowData = SS_SECOND;
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return false;
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case SS_SECOND:
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m_buffer[3U] = data[0U] ^ SCRAMBLER_BYTE1;
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m_buffer[4U] = data[1U] ^ SCRAMBLER_BYTE2;
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m_buffer[5U] = data[2U] ^ SCRAMBLER_BYTE3;
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m_slowData = SS_FIRST;
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break;
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}
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// Is it GPS data, or are we collecting data already?
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if ((m_buffer[0U] & SLOW_DATA_TYPE_MASK) != SLOW_DATA_TYPE_GPS)
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return false;
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return addData(m_buffer + 1U);
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}
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void CAPRSCollector::reset()
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{
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m_state = AS_NONE;
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m_ggaLength = 0U;
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m_ggaValid = false;
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m_rmcLength = 0U;
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m_rmcValid = false;
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m_crcLength = 0U;
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m_crcValid = false;
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m_txtLength = 0U;
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m_txtValid = false;
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m_slowData = SS_FIRST;
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}
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void CAPRSCollector::sync()
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{
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m_slowData = SS_FIRST;
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}
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bool CAPRSCollector::addData(const unsigned char* data)
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{
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wxASSERT(data != NULL);
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if (::memcmp(data, "$GPGG", 5U) == 0) {
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m_state = AS_GGA;
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m_ggaLength = 0U;
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m_ggaValid = false;
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m_rmcLength = 0U;
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m_rmcValid = false;
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m_txtLength = 0U;
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m_txtValid = false;
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addGGAData(data);
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return false;
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} else if (::memcmp(data, "$GPRM", 5U) == 0) {
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m_state = AS_RMC;
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m_rmcLength = 0U;
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m_rmcValid = false;
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m_txtLength = 0U;
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m_txtValid = false;
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addRMCData(data);
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return false;
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} else if (::memcmp(data, "$$CRC", 5U) == 0) {
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m_state = AS_CRC;
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m_crcLength = 0U;
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m_crcValid = false;
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return addCRCData(data);
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} else if (m_state == AS_RMC && m_rmcLength == 0U) {
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m_state = AS_TXT;
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m_txtLength = 0U;
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m_txtValid = false;
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addTXTData(data);
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return false;
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} else if (m_state == AS_GGA) {
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addGGAData(data);
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return false;
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} else if (m_state == AS_RMC) {
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addRMCData(data);
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return false;
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} else if (m_state == AS_CRC) {
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return addCRCData(data);
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} else if (m_state == AS_TXT) {
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return addTXTData(data);
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}
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return false;
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}
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void CAPRSCollector::addGGAData(const unsigned char* data)
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{
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for (unsigned int i = 0U; i < 5U; i++) {
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unsigned char c = data[i];
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m_ggaData[m_ggaLength] = c & 0x7FU;
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m_ggaLength++;
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if (m_ggaLength >= APRS_DATA_LENGTH) {
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// CUtils::dump(wxT("Missed end of $GPGGA data"), m_ggaData, m_ggaLength);
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m_ggaLength = 0U;
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m_ggaValid = false;
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m_state = AS_NONE;
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return;
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}
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if (c == 0x0AU) {
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bool ret = checkXOR(m_ggaData + 1U, m_ggaLength - 1U);
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if (ret) {
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// CUtils::dump(wxT("$GPGGA Valid"), m_ggaData, m_ggaLength);
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m_ggaValid = true;
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m_state = AS_RMC;
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return;
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} else {
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// CUtils::dump(wxT("$GPGGA Bad checksum"), m_ggaData, m_ggaLength);
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m_ggaLength = 0U;
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m_ggaValid = false;
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m_state = AS_RMC;
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return;
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}
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}
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}
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}
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void CAPRSCollector::addRMCData(const unsigned char* data)
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{
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for (unsigned int i = 0U; i < 5U; i++) {
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unsigned char c = data[i];
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m_rmcData[m_rmcLength] = c & 0x7FU;
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m_rmcLength++;
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if (m_rmcLength >= APRS_DATA_LENGTH) {
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// CUtils::dump(wxT("Missed end of $GPRMC data"), m_rmcData, m_rmcLength);
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m_rmcLength = 0U;
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m_rmcValid = false;
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m_state = AS_NONE;
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return;
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}
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if (c == 0x0AU) {
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bool ret = checkXOR(m_rmcData + 1U, m_rmcLength - 1U);
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if (ret) {
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// CUtils::dump(wxT("$GPRMC Valid"), m_rmcData, m_rmcLength);
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m_rmcValid = true;
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m_state = AS_TXT;
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return;
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} else {
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// CUtils::dump(wxT("$GPRMC Bad checksum"), m_rmcData, m_rmcLength);
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m_rmcLength = 0U;
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m_rmcValid = false;
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m_state = AS_TXT;
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return;
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}
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}
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}
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}
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bool CAPRSCollector::addCRCData(const unsigned char* data)
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{
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for (unsigned int i = 0U; i < 5U; i++) {
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unsigned char c = data[i];
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// m_crcData[m_crcLength] = c & 0x7FU; // XXX
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m_crcData[m_crcLength] = c;
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m_crcLength++;
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if (m_crcLength >= APRS_DATA_LENGTH) {
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// CUtils::dump(wxT("Missed end of $$CRC data"), m_crcData, m_crcLength);
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m_state = AS_NONE;
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m_crcLength = 0U;
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m_crcValid = false;
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return false;
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}
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if (c == 0x0DU) {
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bool ret = checkCRC(m_crcData, m_crcLength);
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if (ret) {
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// CUtils::dump(wxT("$$CRC Valid"), m_crcData, m_crcLength);
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m_state = AS_NONE;
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m_crcValid = true;
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return true;
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} else {
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// CUtils::dump(wxT("$$CRC Bad checksum"), m_crcData, m_crcLength);
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m_state = AS_NONE;
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m_crcLength = 0U;
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m_crcValid = false;
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return false;
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}
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}
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}
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return false;
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}
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bool CAPRSCollector::addTXTData(const unsigned char* data)
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{
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for (unsigned int i = 0U; i < 5U; i++) {
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unsigned char c = data[i];
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m_txtData[m_txtLength] = c & 0x7FU;
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m_txtLength++;
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if (m_txtLength >= APRS_DATA_LENGTH) {
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// CUtils::dump(wxT("Missed end of TEXT data"), m_txtData, m_txtLength);
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m_state = AS_NONE;
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m_txtLength = 0U;
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m_txtValid = false;
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return false;
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}
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if (c == 0x0AU) {
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bool ret = checkXOR(m_txtData, m_txtLength);
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if (ret) {
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// CUtils::dump(wxT("TEXT Valid"), m_txtData, m_txtLength);
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m_state = AS_NONE;
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m_txtValid = true;
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return true;
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} else {
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// CUtils::dump(wxT("TEXT Bad checksum"), m_txtData, m_txtLength);
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m_state = AS_NONE;
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m_txtLength = 0U;
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m_txtValid = false;
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return false;
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}
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}
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}
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return false;
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}
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unsigned int CAPRSCollector::getData(unsigned char* data, unsigned int length)
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{
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wxASSERT(data != NULL);
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// Have we got GPS-A data?
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if (m_crcValid) {
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unsigned int len = m_crcLength - 10U;
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if (len > length)
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len = length;
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::memcpy(data, m_crcData + 10U, len);
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m_crcLength = 0U;
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m_crcValid = false;
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return len;
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}
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// Have we got GGA and text data?
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if (m_ggaValid && m_txtValid) {
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unsigned int len = convertNMEA1(data, length);
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m_ggaLength = 0U;
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m_rmcLength = 0U;
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m_txtLength = 0U;
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m_ggaValid = false;
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m_rmcValid = false;
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m_txtValid = false;
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return len;
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}
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// Have we got RMC and text data?
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if (m_rmcValid && m_txtValid) {
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unsigned int len = convertNMEA2(data, length);
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m_ggaLength = 0U;
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m_rmcLength = 0U;
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m_txtLength = 0U;
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m_ggaValid = false;
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m_rmcValid = false;
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m_txtValid = false;
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return len;
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}
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return 0U;
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}
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bool CAPRSCollector::checkXOR(const unsigned char* data, unsigned int length) const
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{
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unsigned int posStar = 0U;
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for (unsigned int i = length - 1U; i > 0U; i--) {
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if (data[i] == '*') {
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posStar = i;
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break;
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}
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}
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if (posStar == 0U)
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return false;
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unsigned char csum = calcXOR(data, posStar);
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char buffer[10U];
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::sprintf(buffer, "%02X", csum);
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return ::memcmp(buffer, data + posStar + 1U, 2U) == 0;
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}
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unsigned char CAPRSCollector::calcXOR(const unsigned char* buffer, unsigned int length) const
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{
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wxASSERT(buffer != NULL);
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wxASSERT(length > 0U);
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unsigned char res = 0U;
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for (unsigned int i = 0U; i < length; i++)
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res ^= buffer[i];
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return res;
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}
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bool CAPRSCollector::checkCRC(const unsigned char* data, unsigned int length) const
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{
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unsigned int csum = calcCRC(data + 10U, length - 10U);
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char buffer[10U];
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::sprintf(buffer, "%04X", csum);
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return ::memcmp(buffer, data + 5U, APRS_CSUM_LENGTH) == 0;
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}
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unsigned int CAPRSCollector::calcCRC(const unsigned char* buffer, unsigned int length) const
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{
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wxASSERT(buffer != NULL);
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wxASSERT(length > 0U);
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unsigned int icomcrc = 0xFFFFU;
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for (unsigned int j = 0U; j < length; j++) {
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unsigned char ch = buffer[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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unsigned int CAPRSCollector::convertNMEA1(unsigned char* data, unsigned int)
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{
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// Parse the $GPGGA string into tokens
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char* pGGA[20U];
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::memset(pGGA, 0x00U, 20U * sizeof(char*));
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unsigned int nGGA = 0U;
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char* str = (char*)m_ggaData;
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for (;;) {
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char* p = mystrsep(&str, ",\r\n");
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pGGA[nGGA++] = p;
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if (p == NULL)
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break;
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}
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// Is there any position data?
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if (pGGA[2U] == NULL || pGGA[3U] == NULL || pGGA[4U] == NULL || pGGA[5U] == NULL || ::strlen(pGGA[2U]) == 0U || ::strlen(pGGA[3U]) == 0U || ::strlen(pGGA[4U]) == 0 || ::strlen(pGGA[5U]) == 0)
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return 0U;
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// Is it a valid GPS fix?
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if (::strcmp(pGGA[6U], "0") == 0)
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return 0U;
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char callsign[10U];
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::memset(callsign, ' ', 10U);
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::strncpy(callsign, (char*)m_txtData, 7U);
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// This can't fail!
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char* p = ::strchr(callsign, ' ');
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if (m_txtData[6U] == ' ' && m_txtData[7U] != ' ') {
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*p++ = '-';
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*p++ = m_txtData[7U];
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} else if (m_txtData[6U] != ' ' && m_txtData[7U] != ' ') {
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*p++ = m_txtData[7U];
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}
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*p = '\0';
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char symbol, overlay;
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getSymbol(m_txtData + 9U, symbol, overlay);
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::sprintf((char*)data, "%s>APDPRS,DSTAR*:!%.7s%s%c%.8s%s%c", callsign, pGGA[2U], pGGA[3U], overlay, pGGA[4U], pGGA[5U], symbol);
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// Get the bearing and speed from the RMC data
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if (m_rmcValid) {
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// Parse the $GPRMC string into tokens
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char* pRMC[20U];
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::memset(pRMC, 0x00U, 20U * sizeof(char*));
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unsigned int nRMC = 0U;
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str = (char*)m_rmcData;
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for (;;) {
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p = mystrsep(&str, ",\r\n");
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pRMC[nRMC++] = p;
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if (p == NULL)
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break;
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}
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// Check that we have a bearing and speed
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if (pRMC[7U] != NULL && pRMC[8U] != NULL && ::strlen(pRMC[7U]) > 0U && ::strlen(pRMC[8U]) > 0U) {
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int bearing = ::atoi(pRMC[8U]);
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int speed = ::atoi(pRMC[7U]);
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::sprintf((char*)data + ::strlen((char*)data), "%03d/%03d", bearing, speed);
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}
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}
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::strcat((char*)data, " ");
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// Insert the message text
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unsigned int j = ::strlen((char*)data);
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for (unsigned int i = 13U; i < 29U; i++) {
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unsigned char c = m_txtData[i];
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if (c == '*') {
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data[j] = '\0';
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break;
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}
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data[j++] = c;
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}
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if (pGGA[9U] != NULL && ::strlen(pGGA[9U]) > 0U) {
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// Convert altitude from metres to feet
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int altitude = ::atoi(pGGA[9U]);
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::sprintf((char*)data + ::strlen((char*)data), "/A=%06.0f", float(altitude) * 3.28F);
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}
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return ::strlen((char*)data);
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}
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unsigned int CAPRSCollector::convertNMEA2(unsigned char* data, unsigned int)
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{
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// Parse the $GPRMC string into tokens
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char* pRMC[20U];
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::memset(pRMC, 0x00U, 20U * sizeof(char*));
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unsigned int nRMC = 0U;
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char* str = (char*)m_rmcData;
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for (;;) {
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char* p = mystrsep(&str, ",\r\n");
|
|
|
|
pRMC[nRMC++] = p;
|
|
if (p == NULL)
|
|
break;
|
|
}
|
|
|
|
// Is there any position data?
|
|
if (pRMC[3U] == NULL || pRMC[4U] == NULL || pRMC[5U] == NULL || pRMC[6U] == NULL || ::strlen(pRMC[3U]) == 0U || ::strlen(pRMC[4U]) == 0U || ::strlen(pRMC[5U]) == 0 || ::strlen(pRMC[6U]) == 0)
|
|
return 0U;
|
|
|
|
// Is it a valid GPS fix?
|
|
if (::strcmp(pRMC[2U], "A") != 0)
|
|
return 0U;
|
|
|
|
char callsign[10U];
|
|
::memset(callsign, ' ', 10U);
|
|
::strncpy(callsign, (char*)m_txtData, 7U);
|
|
|
|
// This can't fail!
|
|
char* p = ::strchr(callsign, ' ');
|
|
|
|
if (m_txtData[6U] == ' ' && m_txtData[7U] != ' ') {
|
|
*p++ = '-';
|
|
*p++ = m_txtData[7U];
|
|
} else if (m_txtData[6U] != ' ' && m_txtData[7U] != ' ') {
|
|
*p++ = m_txtData[7U];
|
|
}
|
|
|
|
*p = '\0';
|
|
|
|
char symbol, overlay;
|
|
getSymbol(m_txtData + 9U, symbol, overlay);
|
|
|
|
::sprintf((char*)data, "%s>APDPRS,DSTAR*:!%.7s%s%c%.8s%s%c", callsign, pRMC[3U], pRMC[4U], overlay, pRMC[5U], pRMC[6U], symbol);
|
|
|
|
if (pRMC[7U] != NULL && pRMC[8U] != NULL && ::strlen(pRMC[7U]) > 0U && ::strlen(pRMC[8U]) > 0U) {
|
|
int bearing = ::atoi(pRMC[8U]);
|
|
int speed = ::atoi(pRMC[7U]);
|
|
|
|
::sprintf((char*)data + ::strlen((char*)data), "%03d/%03d", bearing, speed);
|
|
}
|
|
|
|
if (m_txtData[13U] != '*')
|
|
::strcat((char*)data, " ");
|
|
|
|
// Insert the message text
|
|
unsigned int j = ::strlen((char*)data);
|
|
for (unsigned int i = 13U; i < 29U; i++) {
|
|
unsigned char c = m_txtData[i];
|
|
|
|
if (c == '*') {
|
|
data[j] = '\0';
|
|
break;
|
|
}
|
|
|
|
data[j++] = c;
|
|
}
|
|
|
|
return ::strlen((char*)data);
|
|
}
|
|
|
|
// Function taken from DPRSIntf.java from Pete Loveall AE5PL
|
|
void CAPRSCollector::getSymbol(const unsigned char* data, char& symbol, char& overlay)
|
|
{
|
|
symbol = '.';
|
|
|
|
if (data[3U] == ' ') {
|
|
int offset = -1;
|
|
|
|
switch (data[0U]) {
|
|
case 'B':
|
|
case 'O':
|
|
offset = -33;
|
|
break;
|
|
case 'P':
|
|
case 'A':
|
|
offset = 0;
|
|
break;
|
|
case 'M':
|
|
case 'N':
|
|
offset = -24;
|
|
break;
|
|
case 'H':
|
|
case 'D':
|
|
offset = 8;
|
|
break;
|
|
case 'L':
|
|
case 'S':
|
|
offset = 32;
|
|
break;
|
|
case 'J':
|
|
case 'Q':
|
|
offset = 74;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (offset != -1 && ::isalnum(data[1U])) {
|
|
bool altIcons = false;
|
|
|
|
// x is valid, lets get y
|
|
switch (data[0U]) {
|
|
case 'O':
|
|
case 'A':
|
|
case 'N':
|
|
case 'D':
|
|
case 'S':
|
|
case 'Q':
|
|
altIcons = true;
|
|
break;
|
|
}
|
|
|
|
symbol = char(data[1U] + offset);
|
|
|
|
overlay = '/';
|
|
|
|
if (altIcons) {
|
|
if (data[2] == ' ')
|
|
overlay = '\\';
|
|
else if (::isalnum(data[2]))
|
|
overlay = data[2U];
|
|
else
|
|
overlay = 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Source found at <http://unixpapa.com/incnote/string.html>
|
|
char* CAPRSCollector::mystrsep(char** sp, const char* sep) const
|
|
{
|
|
if (sp == NULL || *sp == NULL || **sp == '\0')
|
|
return NULL;
|
|
|
|
char* s = *sp;
|
|
char* p = s + ::strcspn(s, sep);
|
|
|
|
if (*p != '\0')
|
|
*p++ = '\0';
|
|
|
|
*sp = p;
|
|
|
|
return s;
|
|
}
|