mirror of
https://github.com/tumic0/GPXSee.git
synced 2024-10-06 23:03:22 +02:00
528 lines
9.2 KiB
C++
528 lines
9.2 KiB
C++
#include <cstring>
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#include "misc.h"
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#include "nmeaparser.h"
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static bool validSentence(const char *line, int len)
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{
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const char *lp;
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if (len < 12 || line[0] != '$')
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return false;
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for (lp = line + len - 1; lp > line + 3; lp--)
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if (!::isspace(*lp))
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break;
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if (*(lp-2) != '*' || !::isalnum(*(lp-1)) || !::isalnum(*(lp)))
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return false;
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return true;
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}
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static bool readFloat(const char *data, int len, qreal &f)
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{
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bool ok;
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f = QString(QByteArray::fromRawData(data, len)).toFloat(&ok);
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return ok;
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}
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bool NMEAParser::readAltitude(const char *data, int len, qreal &ele)
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{
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if (!len) {
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ele = NAN;
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return true;
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}
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if (!readFloat(data, len, ele)) {
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_errorString = "Invalid altitude";
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return false;
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}
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return true;
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}
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bool NMEAParser::readGeoidHeight(const char *data, int len, qreal &gh)
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{
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if (!len) {
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gh = 0;
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return true;
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}
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if (!readFloat(data, len, gh)) {
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_errorString = "Invalid geoid height";
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return false;
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}
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return true;
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}
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bool NMEAParser::readTime(const char *data, int len, QTime &time)
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{
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int h, m, s, ms = 0;
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if (!len) {
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time = QTime();
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return true;
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}
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if (len < 6)
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goto error;
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h = str2int(data, 2);
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m = str2int(data + 2, 2);
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s = str2int(data + 4, 2);
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if (h < 0 || m < 0 || s < 0)
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goto error;
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if (len > 7 && data[6] == '.') {
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if ((ms = str2int(data + 7, len - 7)) < 0)
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goto error;
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}
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time = QTime(h, m, s, ms);
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if (!time.isValid())
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goto error;
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return true;
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error:
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_errorString = "Invalid time";
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return false;
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}
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bool NMEAParser::readDate(const char *data, int len, QDate &date)
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{
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int y, m, d;
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if (!len) {
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date = QDate();
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return true;
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}
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if (len < 6)
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goto error;
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d = str2int(data, 2);
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m = str2int(data + 2, 2);
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y = str2int(data + 4, len - 4);
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if (d < 0 || m < 0 || y < 0)
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goto error;
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if (len - 4 == 2)
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date = QDate(y + 2000 < QDate::currentDate().year()
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? 2000 + y : 1900 + y, m, d);
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else
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date = QDate(y, m, d);
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if (!date.isValid())
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goto error;
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return true;
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error:
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_errorString = "Invalid date";
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return false;
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}
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bool NMEAParser::readLat(const char *data, int len, qreal &lat)
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{
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int d, mi;
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qreal mf;
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bool ok;
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if (!len) {
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lat = NAN;
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return true;
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}
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if (len < 7 || data[4] != '.')
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goto error;
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d = str2int(data, 2);
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mi = str2int(data + 2, 2);
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mf = QString(QByteArray::fromRawData(data + 4, len - 4)).toFloat(&ok);
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if (d < 0 || mi < 0 || !ok)
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goto error;
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lat = d + (((qreal)mi + mf) / 60.0);
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if (lat > 90)
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goto error;
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return true;
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error:
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_errorString = "Invalid ltitude";
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return false;
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}
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bool NMEAParser::readNS(const char *data, int len, qreal &lat)
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{
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if (!len) {
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lat = NAN;
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return true;
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}
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if (len != 1 || !(*data == 'N' || *data == 'S')) {
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_errorString = "Invalid N/S value";
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return false;
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}
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if (*data == 'S')
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lat = -lat;
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return true;
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}
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bool NMEAParser::readLon(const char *data, int len, qreal &lon)
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{
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int d, mi;
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qreal mf;
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bool ok;
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if (!len) {
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lon = NAN;
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return true;
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}
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if (len < 8 || data[5] != '.')
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goto error;
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d = str2int(data, 3);
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mi = str2int(data + 3, 2);
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mf = QString(QByteArray::fromRawData(data + 5, len - 5)).toFloat(&ok);
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if (d < 0 || mi < 0 || !ok)
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goto error;
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lon = d + (((qreal)mi + mf) / 60.0);
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if (lon > 180)
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goto error;
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return true;
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error:
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_errorString = "Invalid longitude";
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return false;
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}
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bool NMEAParser::readEW(const char *data, int len, qreal &lon)
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{
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if (!len) {
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lon = NAN;
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return true;
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}
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if (len != 1 || !(*data == 'E' || *data == 'W')) {
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_errorString = "Invalid E/W value";
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return false;
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}
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if (*data == 'W')
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lon = -lon;
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return true;
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}
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bool NMEAParser::readRMC(const char *line, int len)
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{
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int col = 1;
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const char *vp = line;
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qreal lat, lon;
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QTime time;
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QDate date;
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bool valid = true;
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for (const char *lp = line; lp < line + len; lp++) {
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if (*lp == ',' || *lp == '*') {
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switch (col) {
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case 1:
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if (!readTime(vp, lp - vp, time))
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return false;
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break;
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case 2:
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if (*vp != 'A')
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valid = false;
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break;
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case 3:
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if (!readLat(vp, lp - vp, lat))
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return false;
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break;
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case 4:
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if (!readNS(vp, lp - vp, lat))
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return false;
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break;
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case 5:
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if (!readLon(vp, lp - vp, lon))
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return false;
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break;
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case 6:
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if (!readEW(vp, lp - vp, lon))
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return false;
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break;
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case 9:
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if (!readDate(vp, lp - vp, date))
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return false;
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break;
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}
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col++;
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vp = lp + 1;
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}
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}
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if (col < 9) {
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_errorString = "Invalid RMC sentence";
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return false;
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}
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if (!date.isNull()) {
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if (_date.isNull() && !_time.isNull() && !_tracks.last().isEmpty())
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_tracks.last().last().setTimestamp(QDateTime(date, _time, Qt::UTC));
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_date = date;
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}
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if (valid && !_GGA && !std::isnan(lat) && !std::isnan(lon)) {
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Trackpoint t(Coordinates(lon, lat));
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if (!_date.isNull() && !time.isNull())
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t.setTimestamp(QDateTime(_date, time, Qt::UTC));
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_tracks.last().append(t);
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}
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return true;
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}
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bool NMEAParser::readGGA(const char *line, int len)
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{
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int col = 1;
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const char *vp = line;
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qreal lat, lon, ele, gh;
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for (const char *lp = line; lp < line + len; lp++) {
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if (*lp == ',' || *lp == '*') {
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switch (col) {
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case 1:
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if (!readTime(vp, lp - vp, _time))
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return false;
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break;
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case 2:
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if (!readLat(vp, lp - vp, lat))
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return false;
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break;
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case 3:
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if (!readNS(vp, lp - vp, lat))
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return false;
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break;
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case 4:
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if (!readLon(vp, lp - vp, lon))
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return false;
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break;
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case 5:
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if (!readEW(vp, lp - vp, lon))
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return false;
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break;
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case 9:
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if (!readAltitude(vp, lp - vp, ele))
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return false;
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break;
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case 10:
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if ((lp - vp) && !((lp - vp) == 1 && *vp == 'M')) {
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_errorString = "Invalid altitude units";
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return false;
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}
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break;
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case 11:
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if (!readGeoidHeight(vp, lp - vp, gh))
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return false;
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break;
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case 12:
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if ((lp - vp) && !((lp - vp) == 1 && *vp == 'M')) {
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_errorString = "Invalid geoid height units";
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return false;
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}
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break;
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}
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col++;
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vp = lp + 1;
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}
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}
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if (col < 12) {
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_errorString = "Invalid GGA sentence";
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return false;
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}
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if (!std::isnan(lat) && !std::isnan(lon)) {
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Trackpoint t(Coordinates(lon, lat));
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if (!(_time.isNull() || _date.isNull()))
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t.setTimestamp(QDateTime(_date, _time, Qt::UTC));
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if (!std::isnan(ele))
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t.setElevation(ele - gh);
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_tracks.last().append(t);
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_GGA = true;
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}
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return true;
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}
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bool NMEAParser::readWPL(const char *line, int len)
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{
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int col = 1;
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const char *vp = line;
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qreal lat, lon;
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QString name;
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for (const char *lp = line; lp < line + len; lp++) {
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if (*lp == ',' || *lp == '*') {
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switch (col) {
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case 1:
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if (!readLat(vp, lp - vp, lat))
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return false;
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break;
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case 2:
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if (!readNS(vp, lp - vp, lat))
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return false;
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break;
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case 3:
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if (!readLon(vp, lp - vp, lon))
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return false;
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break;
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case 4:
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if (!readEW(vp, lp - vp, lon))
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return false;
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break;
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case 5:
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name = QString(QByteArray(vp, lp - vp));
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break;
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}
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col++;
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vp = lp + 1;
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}
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}
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if (col < 4) {
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_errorString = "Invalid WPL sentence";
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return false;
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}
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if (!std::isnan(lat) && !std::isnan(lon)) {
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Waypoint w(Coordinates(lon, lat));
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w.setName(name);
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_waypoints.append(w);
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}
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return true;
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}
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bool NMEAParser::readZDA(const char *line, int len)
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{
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int col = 1;
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const char *vp = line;
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int d, m, y;
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for (const char *lp = line; lp < line + len; lp++) {
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if (*lp == ',' || *lp == '*') {
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switch (col) {
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case 2:
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if (!(lp - vp))
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return true;
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if ((d = str2int(vp, lp - vp)) < 0) {
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_errorString = "Invalid day";
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return false;
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}
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break;
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case 3:
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if (!(lp - vp))
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return true;
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if ((m = str2int(vp, lp - vp)) < 0) {
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_errorString = "Invalid month";
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return false;
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}
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break;
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case 4:
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if (!(lp - vp))
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return true;
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if ((y = str2int(vp, lp - vp)) < 0) {
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_errorString = "Invalid year";
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return false;
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}
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break;
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}
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col++;
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vp = lp + 1;
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}
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}
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if (col < 4) {
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_errorString = "Invalid ZDA sentence";
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return false;
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}
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_date = QDate(y, m, d);
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if (!_date.isValid()) {
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_errorString = "Invalid date";
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return false;
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}
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return true;
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}
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bool NMEAParser::loadFile(QFile *file)
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{
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qint64 len;
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char line[80 + 2 + 1 + 1];
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_errorLine = 1;
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_errorString.clear();
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_date = QDate();
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_time = QTime();
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_GGA = false;
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_tracks.append(TrackData());
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while (!file->atEnd()) {
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len = file->readLine(line, sizeof(line));
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if (len < 0) {
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_errorString = "I/O error";
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return false;
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} else if (len > (qint64)sizeof(line) - 1) {
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_errorString = "Line limit exceeded";
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return false;
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}
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if (validSentence(line, len)) {
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if (!memcmp(line + 3, "RMC,", 4)) {
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if (!readRMC(line + 7, len))
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return false;
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} else if (!memcmp(line + 3, "GGA,", 4)) {
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if (!readGGA(line + 7, len))
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return false;
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} else if (!memcmp(line + 3, "WPL,", 4)) {
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if (!readWPL(line + 7, len))
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return false;
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} else if (!memcmp(line + 3, "ZDA,", 4)) {
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if (!readZDA(line + 7, len))
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return false;
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}
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}
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_errorLine++;
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}
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if (!_tracks.last().size() && !_waypoints.size()) {
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_errorString = "No usable NMEA sentence found";
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return false;
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}
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return true;
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}
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