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// SPDX-License-Identifier: GPL-2.0
#include "core/parse-gpx.h"
#include "core/subsurface-time.h"
#include <QFile>
#include <QXmlStreamReader>
// Find the coordinates at the time specified in coords.start_dive
// by searching the gpx file "fileName". Here is a typical trkpt element in GPX:
// <trkpt lat="-26.84" lon="32.88"><ele>-53.7</ele><time>2017-08-06T04:56:42Z</time></trkpt>
int getCoordsFromGPXFile(struct dive_coords *coords, QString fileName)
{
struct tm tm1;
time_t trkpt_time = 0;
time_t divetime;
int64_t time_offset = coords->settingsDiff_offset + coords->timeZone_offset;
double lon = 0, lat = 0;
int line = 0;
bool first_line = true;
bool found = false;
bool trkpt_found = false;
divetime = coords->start_dive;
QFile gpxFile;
gpxFile.setFileName(fileName);
if (!gpxFile.open(QIODevice::ReadOnly | QIODevice::Text)) {
QByteArray local8bitBAString1 = fileName.toLocal8Bit();
char *fname = local8bitBAString1.data(); // convert QString to a C string fileName
fprintf(stderr, "GPS file open error: file name = %s\n", fname);
return 1;
}
#ifdef GPSDEBUG
struct tm time; // decode the time of start of dive:
utc_mkdate(divetime, &time);
int dyr,dmon,dday,dhr,dmin;
dyr = time.tm_year;
dmon = time.tm_mon;
dday = time.tm_mday;
dhr = time.tm_hour;
dmin = time.tm_min;
#endif
QXmlStreamReader gpxReader(&gpxFile);
while (!gpxReader.atEnd()) {
gpxReader.readNext();
if (gpxReader.isStartElement()) {
if (gpxReader.name() == "trkpt") {
trkpt_found = true;
line++;
foreach (const QXmlStreamAttribute &attr, gpxReader.attributes()) {
if (attr.name().toString() == QLatin1String("lat"))
lat = attr.value().toString().toDouble();
else if (attr.name().toString() == QLatin1String("lon"))
lon = attr.value().toString().toDouble();
}
}
if (gpxReader.name() == "time" && trkpt_found) { // Ignore the <time> element in the GPX file header
QString dateTimeString = gpxReader.readElementText();
bool ok;
tm1.tm_year = dateTimeString.left(4).toInt(&ok, 10); // Extract the date/time components:
tm1.tm_mon = dateTimeString.mid(5,2).toInt(&ok,10) - 1;
tm1.tm_mday = dateTimeString.mid(8,2).toInt(&ok,10);
tm1.tm_hour = dateTimeString.mid(11,2).toInt(&ok,10);
tm1.tm_min = dateTimeString.mid(14,2).toInt(&ok,10);
tm1.tm_sec = dateTimeString.mid(17,2).toInt(&ok,10);
trkpt_time = utc_mktime(&tm1) + time_offset;
if (first_line) {
first_line = false;
coords->start_track = trkpt_time; // Local time of start of GPS track
}
if (trkpt_time >= divetime && found == false) { // This GPS local time corresponds to the start time of the dive
coords->lon = lon; // save the coordinates
coords->lat = lat;
found = true;
}
#ifdef GPSDEBUG
utc_mkdate(trkpt_time, &time); // print coordinates and time of each trkpt element of the GPX file as well as dive start time
fprintf(stderr, " %02d: lat=%f lon=%f timestamp=%ld (%ld) %02d/%02d/%02d %02d:%02d dt=%ld %02d/%02d/%02d %02d:%02d\n", line, lat,
lon, trkpt_time, time_offset, time.tm_year, time.tm_mon+1, time.tm_mday, time.tm_hour, time.tm_min, divetime, dyr, dmon+1, dday,dhr, dmin);
#endif
}
}
} // while !at.End() // This loop executes until EOF causes a break out of the loop
coords->end_track = trkpt_time; // This is the local time of the end of the GPS track
gpxFile.close();
return 0;
}
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