mirror of
https://github.com/tumic0/GPXSee.git
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205 lines
3.6 KiB
C++
205 lines
3.6 KiB
C++
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#include <cctype>
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#include <cstring>
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#include "igcparser.h"
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static int str2int(const char *str, size_t len)
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{
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int res = 0;
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for (const char *sp = str; sp < str + len; sp++) {
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if (::isdigit(*sp))
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res = res * 10 + *sp - '0';
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else
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return -1;
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}
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return res;
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}
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static bool readLat(const char *line, qreal &lat)
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{
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int d = str2int(line + 7, 2);
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int mi = str2int(line + 9, 2);
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int mf = str2int(line + 11, 3);
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if (d < 0 || mi < 0 || mf < 0)
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return false;
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if (!(line[14] == 'N' || line[14] == 'S'))
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return false;
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lat = d + (((qreal)mi + (qreal)mf/1000) / 60);
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if (lat > 90)
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return false;
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if (line[14] == 'S')
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lat = -lat;
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return true;
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}
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static bool readLon(const char *line, qreal &lon)
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{
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int d = str2int(line + 15, 3);
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int mi = str2int(line + 18, 2);
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int mf = str2int(line + 20, 3);
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if (d < 0 || mi < 0 || mf < 0)
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return false;
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if (!(line[23] == 'E' || line[23] == 'W'))
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return false;
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lon = d + (((qreal)mi + (qreal)mf/1000) / 60);
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if (lon > 180)
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return false;
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if (line[23] == 'W')
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lon = -lon;
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return true;
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}
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static bool readAltitude(const char *line, qreal &ele)
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{
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int p;
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if (!(line[24] == 'A' || line[24] == 'V'))
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return false;
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if (line[25] == '-')
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p = str2int(line + 26, 4);
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else
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p = str2int(line + 25, 5);
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int g = str2int(line + 30, 5);
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if (p < 0 || g < 0)
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return false;
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if (line[24] == 'A')
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ele = (qreal)g;
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else
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ele = NAN;
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return true;
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}
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bool IGCParser::readDate(const char *line)
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{
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int d = str2int(line + 5, 2);
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int m = str2int(line + 7, 2);
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int y = str2int(line + 9, 2);
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if (y < 0 || m < 0 || d < 0) {
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_errorString = "Invalid date";
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return false;
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}
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_date = QDate(2000 + y, m, d);
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return true;
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}
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bool IGCParser::readRecord(const char *line)
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{
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qreal lat, lon, ele;
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QDateTime timestamp;
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if (_date.isNull()) {
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_errorString = "Date header missing";
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return false;
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}
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int h = str2int(line + 1, 2);
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int m = str2int(line + 3, 2);
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int s = str2int(line + 5, 2);
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if (h <0 || m < 0 || s < 0) {
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_errorString = "Invalid timestamp";
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return false;
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}
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QTime time = QTime(h, m, s);
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if (time < _time)
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_date.addDays(1);
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_time = time;
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timestamp = QDateTime(_date, _time, Qt::UTC);
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if (!readLat(line, lat)) {
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_errorString = "Invalid latitude";
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return false;
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}
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if (!readLon(line, lon)) {
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_errorString = "Invalid longitude";
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return false;
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}
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if (!readAltitude(line, ele)) {
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_errorString = "Invalid altitude";
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return false;
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}
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Trackpoint t(Coordinates(lon, lat));
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t.setTimestamp(timestamp);
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t.setElevation(ele);
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_tracks.last().append(t);
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return true;
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}
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bool IGCParser::loadFile(QFile *file)
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{
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qint64 len;
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char line[76 + 2 + 1 + 1];
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_errorLine = 1;
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_errorString.clear();
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_tracks.append(TrackData());
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_time = QTime(0, 0);
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// Read the initial A record
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if ((len = file->readLine(line, sizeof(line))) < 0) {
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_errorString = "I/O error";
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return false;
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} else {
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if (len < 9 || len > (qint64)sizeof(line) - 1 || line[0] != 'A') {
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_errorString = "Not a IGC file";
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return false;
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}
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for (int i = 1; i < 7; i++) {
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if (!::isprint(line[i])) {
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_errorString = "Not a IGC file";
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return false;
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}
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}
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}
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_errorLine++;
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// Read header (H) records and data (B) records
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while ((len = file->readLine(line, sizeof(line))) > 0) {
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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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}
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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 (line[0] == 'B') {
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if (len > 35)
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if (!readRecord(line))
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return false;
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} else if (line[0] == 'H') {
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if (len > 10 && !::strncmp(line + 1, "FDTE", 4))
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if (!readDate(line))
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return false;
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}
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_errorLine++;
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}
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return true;
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}
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