2 * viking -- GPS Data and Topo Analyzer, Explorer, and Manager
4 * Copyright (C) 2003-2007, Evan Battaglia <gtoevan@gmx.net>
5 * Copyright (C) 2007, Quy Tonthat <qtonthat@gmail.com>
6 * Copyright (C) 2008, Hein Ragas <viking@ragas.nl>
7 * Copyright (C) 2009, Tal B <tal.bav@gmail.com>
8 * Copyright (c) 2012, Rob Norris <rw_norris@hotmail.com>
10 * Some of the code adapted from GPSBabel 1.2.7
11 * http://gpsbabel.sf.net/
12 * Copyright (C) 2002, 2003, 2004, 2005 Robert Lipe, robertlipe@usa.net
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
33 #define _XOPEN_SOURCE /* glibc2 needs this */
59 tt_wpt_link, /* New in GPX 1.1 */
70 tt_trk_trkseg_trkpt_ele,
71 tt_trk_trkseg_trkpt_time,
72 tt_trk_trkseg_trkpt_name,
74 tt_trk_trkseg_trkpt_course,
75 tt_trk_trkseg_trkpt_speed,
76 tt_trk_trkseg_trkpt_fix,
77 tt_trk_trkseg_trkpt_sat,
79 tt_trk_trkseg_trkpt_hdop,
80 tt_trk_trkseg_trkpt_vdop,
81 tt_trk_trkseg_trkpt_pdop,
88 typedef struct tag_mapping {
89 tag_type tag_type; /* enum from above for this tag */
90 const char *tag_name; /* xpath-ish tag name */
94 GpxWritingOptions *options;
99 * xpath(ish) mappings between full tag paths and internal identifers.
100 * These appear in the order they appear in the GPX specification.
101 * If it's not a tag we explictly handle, it doesn't go here.
104 tag_mapping tag_path_map[] = {
106 { tt_wpt, "/gpx/wpt" },
108 { tt_waypoint, "/loc/waypoint" },
109 { tt_waypoint_coord, "/loc/waypoint/coord" },
110 { tt_waypoint_name, "/loc/waypoint/name" },
112 { tt_wpt_ele, "/gpx/wpt/ele" },
113 { tt_wpt_time, "/gpx/wpt/time" },
114 { tt_wpt_name, "/gpx/wpt/name" },
115 { tt_wpt_cmt, "/gpx/wpt/cmt" },
116 { tt_wpt_desc, "/gpx/wpt/desc" },
117 { tt_wpt_sym, "/gpx/wpt/sym" },
118 { tt_wpt_sym, "/loc/waypoint/type" },
119 { tt_wpt_link, "/gpx/wpt/link" }, /* GPX 1.1 */
121 { tt_trk, "/gpx/trk" },
122 { tt_trk_name, "/gpx/trk/name" },
123 { tt_trk_cmt, "/gpx/trk/cmt" },
124 { tt_trk_desc, "/gpx/trk/desc" },
125 { tt_trk_trkseg, "/gpx/trk/trkseg" },
126 { tt_trk_trkseg_trkpt, "/gpx/trk/trkseg/trkpt" },
127 { tt_trk_trkseg_trkpt_ele, "/gpx/trk/trkseg/trkpt/ele" },
128 { tt_trk_trkseg_trkpt_time, "/gpx/trk/trkseg/trkpt/time" },
129 { tt_trk_trkseg_trkpt_name, "/gpx/trk/trkseg/trkpt/name" },
131 { tt_trk_trkseg_trkpt_course, "/gpx/trk/trkseg/trkpt/course" },
132 { tt_trk_trkseg_trkpt_speed, "/gpx/trk/trkseg/trkpt/speed" },
133 { tt_trk_trkseg_trkpt_fix, "/gpx/trk/trkseg/trkpt/fix" },
134 { tt_trk_trkseg_trkpt_sat, "/gpx/trk/trkseg/trkpt/sat" },
136 { tt_trk_trkseg_trkpt_hdop, "/gpx/trk/trkseg/trkpt/hdop" },
137 { tt_trk_trkseg_trkpt_vdop, "/gpx/trk/trkseg/trkpt/vdop" },
138 { tt_trk_trkseg_trkpt_pdop, "/gpx/trk/trkseg/trkpt/pdop" },
140 { tt_rte, "/gpx/rte" },
141 // NB Route reuses track point feature tags
142 { tt_trk_name, "/gpx/rte/name" },
143 { tt_trk_cmt, "/gpx/rte/cmt" },
144 { tt_trk_desc, "/gpx/rte/desc" },
145 { tt_trk_trkseg_trkpt, "/gpx/rte/rtept" },
146 { tt_trk_trkseg_trkpt_name, "/gpx/rte/rtept/name" },
147 { tt_trk_trkseg_trkpt_ele, "/gpx/rte/rtept/ele" },
152 static tag_type get_tag(const char *t)
155 for (tm = tag_path_map; tm->tag_type != 0; tm++)
156 if (0 == strcmp(tm->tag_name, t))
161 /******************************************/
163 tag_type current_tag = tt_unknown;
164 GString *xpath = NULL;
165 GString *c_cdata = NULL;
167 /* current ("c_") objects */
168 VikTrackpoint *c_tp = NULL;
169 VikWaypoint *c_wp = NULL;
170 VikTrack *c_tr = NULL;
172 gchar *c_wp_name = NULL;
173 gchar *c_tr_name = NULL;
175 /* temporary things so we don't have to create them lots of times */
176 const gchar *c_slat, *c_slon;
179 /* specialty flags / etc */
180 gboolean f_tr_newseg;
181 guint unnamed_waypoints = 0;
182 guint unnamed_tracks = 0;
183 guint unnamed_routes = 0;
185 static const char *get_attr ( const char **attr, const char *key )
188 if ( strcmp(*attr,key) == 0 )
195 static gboolean set_c_ll ( const char **attr )
197 if ( (c_slat = get_attr ( attr, "lat" )) && (c_slon = get_attr ( attr, "lon" )) ) {
198 c_ll.lat = g_ascii_strtod(c_slat, NULL);
199 c_ll.lon = g_ascii_strtod(c_slon, NULL);
205 static void gpx_start(VikTrwLayer *vtl, const char *el, const char **attr)
207 static const gchar *tmp;
209 g_string_append_c ( xpath, '/' );
210 g_string_append ( xpath, el );
211 current_tag = get_tag ( xpath->str );
213 switch ( current_tag ) {
216 if ( set_c_ll( attr ) ) {
217 c_wp = vik_waypoint_new ();
218 c_wp->visible = TRUE;
219 if ( get_attr ( attr, "hidden" ) )
220 c_wp->visible = FALSE;
222 vik_coord_load_from_latlon ( &(c_wp->coord), vik_trw_layer_get_coord_mode ( vtl ), &c_ll );
228 c_tr = vik_track_new ();
229 vik_track_set_defaults ( c_tr );
230 c_tr->is_route = (current_tag == tt_rte) ? TRUE : FALSE;
231 c_tr->visible = TRUE;
232 if ( get_attr ( attr, "hidden" ) )
233 c_tr->visible = FALSE;
240 case tt_trk_trkseg_trkpt:
241 if ( set_c_ll( attr ) ) {
242 c_tp = vik_trackpoint_new ();
243 vik_coord_load_from_latlon ( &(c_tp->coord), vik_trw_layer_get_coord_mode ( vtl ), &c_ll );
245 c_tp->newsegment = TRUE;
248 c_tr->trackpoints = g_list_append ( c_tr->trackpoints, c_tp );
252 case tt_trk_trkseg_trkpt_name:
253 case tt_trk_trkseg_trkpt_ele:
254 case tt_trk_trkseg_trkpt_time:
264 g_string_erase ( c_cdata, 0, -1 ); /* clear the cdata buffer */
268 c_wp = vik_waypoint_new ();
269 c_wp->visible = TRUE;
272 case tt_waypoint_coord:
273 if ( set_c_ll( attr ) )
274 vik_coord_load_from_latlon ( &(c_wp->coord), vik_trw_layer_get_coord_mode ( vtl ), &c_ll );
277 case tt_waypoint_name:
278 if ( ( tmp = get_attr(attr, "id") ) ) {
280 g_free ( c_wp_name );
281 c_wp_name = g_strdup ( tmp );
283 g_string_erase ( c_cdata, 0, -1 ); /* clear the cdata buffer for description */
290 static void gpx_end(VikTrwLayer *vtl, const char *el)
292 static GTimeVal tp_time;
293 static GTimeVal wp_time;
295 g_string_truncate ( xpath, xpath->len - strlen(el) - 1 );
297 switch ( current_tag ) {
302 c_wp_name = g_strdup_printf("VIKING_WP%04d", unnamed_waypoints++);
303 vik_trw_layer_filein_add_waypoint ( vtl, c_wp_name, c_wp );
304 g_free ( c_wp_name );
311 c_tr_name = g_strdup_printf("VIKING_TR%03d", unnamed_tracks++);
312 // Delibrate fall through
315 c_tr_name = g_strdup_printf("VIKING_RT%03d", unnamed_routes++);
316 vik_trw_layer_filein_add_track ( vtl, c_tr_name, c_tr );
317 g_free ( c_tr_name );
324 g_free ( c_wp_name );
325 c_wp_name = g_strdup ( c_cdata->str );
326 g_string_erase ( c_cdata, 0, -1 );
331 g_free ( c_tr_name );
332 c_tr_name = g_strdup ( c_cdata->str );
333 g_string_erase ( c_cdata, 0, -1 );
337 c_wp->altitude = g_ascii_strtod ( c_cdata->str, NULL );
338 g_string_erase ( c_cdata, 0, -1 );
341 case tt_trk_trkseg_trkpt_ele:
342 c_tp->altitude = g_ascii_strtod ( c_cdata->str, NULL );
343 g_string_erase ( c_cdata, 0, -1 );
346 case tt_waypoint_name: /* .loc name is really description. */
348 vik_waypoint_set_description ( c_wp, c_cdata->str );
349 g_string_erase ( c_cdata, 0, -1 );
353 vik_waypoint_set_comment ( c_wp, c_cdata->str );
354 g_string_erase ( c_cdata, 0, -1 );
358 vik_waypoint_set_image ( c_wp, c_cdata->str );
359 g_string_erase ( c_cdata, 0, -1 );
363 vik_waypoint_set_symbol ( c_wp, c_cdata->str );
364 g_string_erase ( c_cdata, 0, -1 );
369 vik_track_set_description ( c_tr, c_cdata->str );
370 g_string_erase ( c_cdata, 0, -1 );
374 vik_track_set_comment ( c_tr, c_cdata->str );
375 g_string_erase ( c_cdata, 0, -1 );
379 if ( g_time_val_from_iso8601(c_cdata->str, &wp_time) ) {
380 c_wp->timestamp = wp_time.tv_sec;
381 c_wp->has_timestamp = TRUE;
383 g_string_erase ( c_cdata, 0, -1 );
386 case tt_trk_trkseg_trkpt_name:
387 vik_trackpoint_set_name ( c_tp, c_cdata->str );
388 g_string_erase ( c_cdata, 0, -1 );
391 case tt_trk_trkseg_trkpt_time:
392 if ( g_time_val_from_iso8601(c_cdata->str, &tp_time) ) {
393 c_tp->timestamp = tp_time.tv_sec;
394 c_tp->has_timestamp = TRUE;
396 g_string_erase ( c_cdata, 0, -1 );
399 case tt_trk_trkseg_trkpt_course:
400 c_tp->course = g_ascii_strtod ( c_cdata->str, NULL );
401 g_string_erase ( c_cdata, 0, -1 );
404 case tt_trk_trkseg_trkpt_speed:
405 c_tp->speed = g_ascii_strtod ( c_cdata->str, NULL );
406 g_string_erase ( c_cdata, 0, -1 );
409 case tt_trk_trkseg_trkpt_fix:
410 if (!strcmp("2d", c_cdata->str))
411 c_tp->fix_mode = VIK_GPS_MODE_2D;
412 else if (!strcmp("3d", c_cdata->str))
413 c_tp->fix_mode = VIK_GPS_MODE_3D;
414 else /* TODO: more fix modes here */
415 c_tp->fix_mode = VIK_GPS_MODE_NOT_SEEN;
416 g_string_erase ( c_cdata, 0, -1 );
419 case tt_trk_trkseg_trkpt_sat:
420 c_tp->nsats = atoi ( c_cdata->str );
421 g_string_erase ( c_cdata, 0, -1 );
424 case tt_trk_trkseg_trkpt_hdop:
425 c_tp->hdop = g_strtod ( c_cdata->str, NULL );
426 g_string_erase ( c_cdata, 0, -1 );
429 case tt_trk_trkseg_trkpt_vdop:
430 c_tp->vdop = g_strtod ( c_cdata->str, NULL );
431 g_string_erase ( c_cdata, 0, -1 );
434 case tt_trk_trkseg_trkpt_pdop:
435 c_tp->pdop = g_strtod ( c_cdata->str, NULL );
436 g_string_erase ( c_cdata, 0, -1 );
442 current_tag = get_tag ( xpath->str );
445 static void gpx_cdata(void *dta, const XML_Char *s, int len)
447 switch ( current_tag ) {
451 case tt_trk_trkseg_trkpt_ele:
458 case tt_trk_trkseg_trkpt_time:
460 case tt_trk_trkseg_trkpt_name:
461 case tt_trk_trkseg_trkpt_course:
462 case tt_trk_trkseg_trkpt_speed:
463 case tt_trk_trkseg_trkpt_fix:
464 case tt_trk_trkseg_trkpt_sat:
465 case tt_trk_trkseg_trkpt_hdop:
466 case tt_trk_trkseg_trkpt_vdop:
467 case tt_trk_trkseg_trkpt_pdop:
468 case tt_waypoint_name: /* .loc name is really description. */
469 g_string_append_len ( c_cdata, s, len );
472 default: break; /* ignore cdata from other things */
476 // make like a "stack" of tag names
477 // like gpspoint's separated like /gpx/wpt/whatever
479 gboolean a_gpx_read_file( VikTrwLayer *vtl, FILE *f ) {
480 XML_Parser parser = XML_ParserCreate(NULL);
482 enum XML_Status status = XML_STATUS_ERROR;
484 XML_SetElementHandler(parser, (XML_StartElementHandler) gpx_start, (XML_EndElementHandler) gpx_end);
485 XML_SetUserData(parser, vtl); /* in the future we could remove all global variables */
486 XML_SetCharacterDataHandler(parser, (XML_CharacterDataHandler) gpx_cdata);
490 g_assert ( f != NULL && vtl != NULL );
492 xpath = g_string_new ( "" );
493 c_cdata = g_string_new ( "" );
495 unnamed_waypoints = 1;
500 len = fread(buf, 1, sizeof(buf)-7, f);
501 done = feof(f) || !len;
502 status = XML_Parse(parser, buf, len, done);
505 XML_ParserFree (parser);
506 g_string_free ( xpath, TRUE );
507 g_string_free ( c_cdata, TRUE );
509 return status != XML_STATUS_ERROR;
512 /**** entitize from GPSBabel ****/
520 entity_types stdentities[] = {
522 { "'", "'", 1 },
525 { "\"", """, 0 },
529 void utf8_to_int( const char *cp, int *bytes, int *value )
531 if ( (*cp & 0xe0) == 0xc0 ) {
532 if ( (*(cp+1) & 0xc0) != 0x80 ) goto dodefault;
534 *value = ((*cp & 0x1f) << 6) |
537 else if ( (*cp & 0xf0) == 0xe0 ) {
538 if ( (*(cp+1) & 0xc0) != 0x80 ) goto dodefault;
539 if ( (*(cp+2) & 0xc0) != 0x80 ) goto dodefault;
541 *value = ((*cp & 0x0f) << 12) |
542 ((*(cp+1) & 0x3f) << 6) |
545 else if ( (*cp & 0xf8) == 0xf0 ) {
546 if ( (*(cp+1) & 0xc0) != 0x80 ) goto dodefault;
547 if ( (*(cp+2) & 0xc0) != 0x80 ) goto dodefault;
548 if ( (*(cp+3) & 0xc0) != 0x80 ) goto dodefault;
550 *value = ((*cp & 0x07) << 18) |
551 ((*(cp+1) & 0x3f) << 12) |
552 ((*(cp+2) & 0x3f) << 6) |
555 else if ( (*cp & 0xfc) == 0xf8 ) {
556 if ( (*(cp+1) & 0xc0) != 0x80 ) goto dodefault;
557 if ( (*(cp+2) & 0xc0) != 0x80 ) goto dodefault;
558 if ( (*(cp+3) & 0xc0) != 0x80 ) goto dodefault;
559 if ( (*(cp+4) & 0xc0) != 0x80 ) goto dodefault;
561 *value = ((*cp & 0x03) << 24) |
562 ((*(cp+1) & 0x3f) << 18) |
563 ((*(cp+2) & 0x3f) << 12) |
564 ((*(cp+3) & 0x3f) << 6) |
567 else if ( (*cp & 0xfe) == 0xfc ) {
568 if ( (*(cp+1) & 0xc0) != 0x80 ) goto dodefault;
569 if ( (*(cp+2) & 0xc0) != 0x80 ) goto dodefault;
570 if ( (*(cp+3) & 0xc0) != 0x80 ) goto dodefault;
571 if ( (*(cp+4) & 0xc0) != 0x80 ) goto dodefault;
572 if ( (*(cp+5) & 0xc0) != 0x80 ) goto dodefault;
574 *value = ((*cp & 0x01) << 30) |
575 ((*(cp+1) & 0x3f) << 24) |
576 ((*(cp+2) & 0x3f) << 18) |
577 ((*(cp+3) & 0x3f) << 12) |
578 ((*(cp+4) & 0x3f) << 6) |
584 *value = (unsigned char)*cp;
590 entitize(const char * str)
592 int elen, ecount, nsecount;
595 char * p, * tmp, * xstr;
601 elen = ecount = nsecount = 0;
603 /* figure # of entity replacements and additional size. */
606 while ((cp = strstr(cp, ep->text)) != NULL) {
607 elen += strlen(ep->entity) - strlen(ep->text);
609 cp += strlen(ep->text);
614 /* figure the same for other than standard entities (i.e. anything
615 * that isn't in the range U+0000 to U+007F */
616 for ( cp = str; *cp; cp++ ) {
619 utf8_to_int( cp, &bytes, &value );
621 elen += sprintf( tmpsub, "&#x%x;", value ) - bytes;
626 /* enough space for the whole string plus entity replacements, if any */
627 tmp = g_malloc((strlen(str) + elen + 1));
630 /* no entity replacements */
631 if (ecount == 0 && nsecount == 0)
635 for (ep = stdentities; ep->text; ep++) {
637 while ((p = strstr(p, ep->text)) != NULL) {
638 elen = strlen(ep->entity);
640 xstr = g_strdup(p + strlen(ep->text));
642 strcpy(p, ep->entity);
643 strcpy(p + elen, xstr);
652 if ( nsecount != 0 ) {
656 utf8_to_int( p, &bytes, &value );
658 xstr = g_strdup( p + bytes );
663 sprintf( p, "&#x%x;", value );
677 /**** end GPSBabel code ****/
681 static void gpx_write_waypoint ( VikWaypoint *wp, GpxWritingContext *context )
683 // Don't write invisible waypoints when specified
684 if (context->options && !context->options->hidden && !wp->visible)
687 FILE *f = context->file;
688 static struct LatLon ll;
691 vik_coord_to_latlon ( &(wp->coord), &ll );
692 s_lat = a_coords_dtostr( ll.lat );
693 s_lon = a_coords_dtostr( ll.lon );
694 // NB 'hidden' is not part of any GPX standard - this appears to be a made up Viking 'extension'
695 // luckily most other GPX processing software ignores things they don't understand
696 fprintf ( f, "<wpt lat=\"%s\" lon=\"%s\"%s>\n",
697 s_lat, s_lon, wp->visible ? "" : " hidden=\"hidden\"" );
703 tmp = entitize ( wp->name );
705 tmp = g_strdup ("waypoint");
707 fprintf ( f, " <name>%s</name>\n", tmp );
710 if ( wp->altitude != VIK_DEFAULT_ALTITUDE )
712 tmp = a_coords_dtostr ( wp->altitude );
713 fprintf ( f, " <ele>%s</ele>\n", tmp );
717 if ( wp->has_timestamp ) {
719 timestamp.tv_sec = wp->timestamp;
720 timestamp.tv_usec = 0;
722 gchar *time_iso8601 = g_time_val_to_iso8601 ( ×tamp );
723 if ( time_iso8601 != NULL )
724 fprintf ( f, " <time>%s</time>\n", time_iso8601 );
725 g_free ( time_iso8601 );
730 tmp = entitize(wp->comment);
731 fprintf ( f, " <cmt>%s</cmt>\n", tmp );
734 if ( wp->description )
736 tmp = entitize(wp->description);
737 fprintf ( f, " <desc>%s</desc>\n", tmp );
742 tmp = entitize(wp->image);
743 fprintf ( f, " <link>%s</link>\n", tmp );
748 tmp = entitize(wp->symbol);
749 if ( a_vik_gpx_export_wpt_sym_name ( ) ) {
750 // Lowercase the symbol name
751 gchar *tmp2 = g_utf8_strdown ( tmp, -1 );
752 fprintf ( f, " <sym>%s</sym>\n", tmp2 );
756 fprintf ( f, " <sym>%s</sym>\n", tmp);
760 fprintf ( f, "</wpt>\n" );
763 static void gpx_write_trackpoint ( VikTrackpoint *tp, GpxWritingContext *context )
765 FILE *f = context->file;
766 static struct LatLon ll;
767 gchar *s_lat,*s_lon, *s_alt, *s_dop;
769 vik_coord_to_latlon ( &(tp->coord), &ll );
771 // No such thing as a rteseg! So make sure we don't put them in
772 if ( context->options && !context->options->is_route && tp->newsegment )
773 fprintf ( f, " </trkseg>\n <trkseg>\n" );
775 s_lat = a_coords_dtostr( ll.lat );
776 s_lon = a_coords_dtostr( ll.lon );
777 fprintf ( f, " <%spt lat=\"%s\" lon=\"%s\">\n", (context->options && context->options->is_route) ? "rte" : "trk", s_lat, s_lon );
778 g_free ( s_lat ); s_lat = NULL;
779 g_free ( s_lon ); s_lon = NULL;
782 gchar *s_name = entitize(tp->name);
783 fprintf ( f, " <name>%s</name>\n", s_name );
788 if ( tp->altitude != VIK_DEFAULT_ALTITUDE )
790 s_alt = a_coords_dtostr ( tp->altitude );
792 else if ( context->options != NULL && context->options->force_ele )
794 s_alt = a_coords_dtostr ( 0 );
797 fprintf ( f, " <ele>%s</ele>\n", s_alt );
798 g_free ( s_alt ); s_alt = NULL;
801 if ( tp->has_timestamp ) {
803 timestamp.tv_sec = tp->timestamp;
804 timestamp.tv_usec = 0;
806 time_iso8601 = g_time_val_to_iso8601 ( ×tamp );
808 else if ( context->options != NULL && context->options->force_time )
811 g_get_current_time ( ¤t );
813 time_iso8601 = g_time_val_to_iso8601 ( ¤t );
815 if ( time_iso8601 != NULL )
816 fprintf ( f, " <time>%s</time>\n", time_iso8601 );
817 g_free(time_iso8601);
820 if (!isnan(tp->course)) {
821 gchar *s_course = a_coords_dtostr(tp->course);
822 fprintf ( f, " <course>%s</course>\n", s_course );
825 if (!isnan(tp->speed)) {
826 gchar *s_speed = a_coords_dtostr(tp->speed);
827 fprintf ( f, " <speed>%s</speed>\n", s_speed );
830 if (tp->fix_mode == VIK_GPS_MODE_2D)
831 fprintf ( f, " <fix>2d</fix>\n");
832 if (tp->fix_mode == VIK_GPS_MODE_3D)
833 fprintf ( f, " <fix>3d</fix>\n");
835 fprintf ( f, " <sat>%d</sat>\n", tp->nsats );
838 if ( tp->hdop != VIK_DEFAULT_DOP )
840 s_dop = a_coords_dtostr ( tp->hdop );
843 fprintf ( f, " <hdop>%s</hdop>\n", s_dop );
844 g_free ( s_dop ); s_dop = NULL;
846 if ( tp->vdop != VIK_DEFAULT_DOP )
848 s_dop = a_coords_dtostr ( tp->vdop );
851 fprintf ( f, " <vdop>%s</vdop>\n", s_dop );
852 g_free ( s_dop ); s_dop = NULL;
854 if ( tp->pdop != VIK_DEFAULT_DOP )
856 s_dop = a_coords_dtostr ( tp->pdop );
859 fprintf ( f, " <pdop>%s</pdop>\n", s_dop );
860 g_free ( s_dop ); s_dop = NULL;
862 fprintf ( f, " </%spt>\n", (context->options && context->options->is_route) ? "rte" : "trk" );
866 static void gpx_write_track ( VikTrack *t, GpxWritingContext *context )
868 // Don't write invisible tracks when specified
869 if (context->options && !context->options->hidden && !t->visible)
872 FILE *f = context->file;
874 gboolean first_tp_is_newsegment = FALSE; /* must temporarily make it not so, but we want to restore state. not that it matters. */
878 tmp = entitize ( t->name );
880 tmp = g_strdup ("track");
882 // NB 'hidden' is not part of any GPX standard - this appears to be a made up Viking 'extension'
883 // luckily most other GPX processing software ignores things they don't understand
884 fprintf ( f, "<%s%s>\n <name>%s</name>\n",
885 t->is_route ? "rte" : "trk",
886 t->visible ? "" : " hidden=\"hidden\"",
892 tmp = entitize ( t->comment );
893 fprintf ( f, " <cmt>%s</cmt>\n", tmp );
897 if ( t->description )
899 tmp = entitize ( t->description );
900 fprintf ( f, " <desc>%s</desc>\n", tmp );
904 /* No such thing as a rteseg! */
906 fprintf ( f, " <trkseg>\n" );
908 if ( t->trackpoints && t->trackpoints->data ) {
909 first_tp_is_newsegment = VIK_TRACKPOINT(t->trackpoints->data)->newsegment;
910 VIK_TRACKPOINT(t->trackpoints->data)->newsegment = FALSE; /* so we won't write </trkseg><trkseg> already */
911 g_list_foreach ( t->trackpoints, (GFunc) gpx_write_trackpoint, context );
912 VIK_TRACKPOINT(t->trackpoints->data)->newsegment = first_tp_is_newsegment; /* restore state */
915 /* NB apparently no such thing as a rteseg! */
917 fprintf ( f, " </trkseg>\n");
919 fprintf ( f, "</%s>\n", t->is_route ? "rte" : "trk" );
922 static void gpx_write_header( FILE *f )
924 fprintf(f, "<?xml version=\"1.0\"?>\n"
925 "<gpx version=\"1.0\" creator=\"Viking -- http://viking.sf.net/\"\n"
926 "xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n"
927 "xmlns=\"http://www.topografix.com/GPX/1/0\"\n"
928 "xsi:schemaLocation=\"http://www.topografix.com/GPX/1/0 http://www.topografix.com/GPX/1/0/gpx.xsd\">\n");
931 static void gpx_write_footer( FILE *f )
933 fprintf(f, "</gpx>\n");
936 static int gpx_waypoint_compare(const void *x, const void *y)
938 VikWaypoint *a = (VikWaypoint *)x;
939 VikWaypoint *b = (VikWaypoint *)y;
940 return strcmp(a->name,b->name);
943 static int gpx_track_compare_name(const void *x, const void *y)
945 VikTrack *a = (VikTrack *)x;
946 VikTrack *b = (VikTrack *)y;
947 return strcmp(a->name,b->name);
950 /* Function to compare two tracks by their first timestamp */
951 static int gpx_track_compare_timestamp (const void *x, const void *y)
953 VikTrack *a = (VikTrack *)x;
954 VikTrack *b = (VikTrack *)y;
956 VikTrackpoint *tpa = NULL;
957 VikTrackpoint *tpb = NULL;
959 if ( a->trackpoints )
960 tpa = VIK_TRACKPOINT(g_list_first(a->trackpoints)->data);
962 if ( b->trackpoints )
963 tpb = VIK_TRACKPOINT(g_list_first(b->trackpoints)->data);
966 if ( tpa->timestamp < tpb->timestamp )
968 if ( tpa->timestamp > tpb->timestamp )
981 void a_gpx_write_file ( VikTrwLayer *vtl, FILE *f, GpxWritingOptions *options )
983 GpxWritingContext context = { options, f };
985 gpx_write_header ( f );
987 // gather waypoints in a list, then sort
988 // g_hash_table_get_values: glib 2.14+
989 GList *gl = g_hash_table_get_values ( vik_trw_layer_get_waypoints ( vtl ) );
990 gl = g_list_sort ( gl, gpx_waypoint_compare );
993 for (iter = g_list_first (gl); iter != NULL; iter = g_list_next (iter)) {
994 gpx_write_waypoint ( (VikWaypoint*)iter->data, &context );
999 //gl = g_hash_table_get_values ( vik_trw_layer_get_tracks ( vtl ) );
1000 // Forming the list manually seems to produce one that is more likely to be nearer to the creation order
1002 gpointer key, value;
1003 GHashTableIter ght_iter;
1004 g_hash_table_iter_init ( &ght_iter, vik_trw_layer_get_tracks ( vtl ) );
1005 while ( g_hash_table_iter_next (&ght_iter, &key, &value) ) {
1006 gl = g_list_prepend ( gl ,value );
1008 gl = g_list_reverse ( gl );
1010 // Sort method determined by preference
1011 if ( a_vik_get_gpx_export_trk_sort() == VIK_GPX_EXPORT_TRK_SORT_TIME )
1012 gl = g_list_sort ( gl, gpx_track_compare_timestamp );
1013 else if ( a_vik_get_gpx_export_trk_sort() == VIK_GPX_EXPORT_TRK_SORT_ALPHA )
1014 gl = g_list_sort ( gl, gpx_track_compare_name );
1016 // Routes sorted by name
1017 GList *glrte = g_hash_table_get_values ( vik_trw_layer_get_routes ( vtl ) );
1018 glrte = g_list_sort ( glrte, gpx_track_compare_name );
1020 // g_list_concat doesn't copy memory properly
1021 // so process each list separately
1023 GpxWritingContext context_tmp = context;
1024 GpxWritingOptions opt_tmp = { FALSE, FALSE, FALSE };
1025 // Force trackpoints on tracks
1026 if ( !context.options )
1027 context_tmp.options = &opt_tmp;
1028 context_tmp.options->is_route = FALSE;
1030 // Loop around each list and write each one
1031 for (iter = g_list_first (gl); iter != NULL; iter = g_list_next (iter)) {
1032 gpx_write_track ( (VikTrack*)iter->data, &context_tmp );
1035 // Routes (to get routepoints)
1036 context_tmp.options->is_route = TRUE;
1037 for (iter = g_list_first (glrte); iter != NULL; iter = g_list_next (iter)) {
1038 gpx_write_track ( (VikTrack*)iter->data, &context_tmp );
1042 g_list_free ( glrte );
1044 gpx_write_footer ( f );
1047 void a_gpx_write_track_file ( VikTrack *trk, FILE *f, GpxWritingOptions *options )
1049 GpxWritingContext context = {options, f};
1050 gpx_write_header ( f );
1051 gpx_write_track ( trk, &context );
1052 gpx_write_footer ( f );