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,
73 tt_trk_trkseg_trkpt_course,
74 tt_trk_trkseg_trkpt_speed,
75 tt_trk_trkseg_trkpt_fix,
76 tt_trk_trkseg_trkpt_sat,
78 tt_trk_trkseg_trkpt_hdop,
79 tt_trk_trkseg_trkpt_vdop,
80 tt_trk_trkseg_trkpt_pdop,
87 typedef struct tag_mapping {
88 tag_type tag_type; /* enum from above for this tag */
89 const char *tag_name; /* xpath-ish tag name */
93 GpxWritingOptions *options;
98 * xpath(ish) mappings between full tag paths and internal identifers.
99 * These appear in the order they appear in the GPX specification.
100 * If it's not a tag we explictly handle, it doesn't go here.
103 tag_mapping tag_path_map[] = {
105 { tt_wpt, "/gpx/wpt" },
107 { tt_waypoint, "/loc/waypoint" },
108 { tt_waypoint_coord, "/loc/waypoint/coord" },
109 { tt_waypoint_name, "/loc/waypoint/name" },
111 { tt_wpt_ele, "/gpx/wpt/ele" },
112 { tt_wpt_time, "/gpx/wpt/time" },
113 { tt_wpt_name, "/gpx/wpt/name" },
114 { tt_wpt_cmt, "/gpx/wpt/cmt" },
115 { tt_wpt_desc, "/gpx/wpt/desc" },
116 { tt_wpt_sym, "/gpx/wpt/sym" },
117 { tt_wpt_sym, "/loc/waypoint/type" },
118 { tt_wpt_link, "/gpx/wpt/link" }, /* GPX 1.1 */
120 { tt_trk, "/gpx/trk" },
121 { tt_trk_name, "/gpx/trk/name" },
122 { tt_trk_cmt, "/gpx/trk/cmt" },
123 { tt_trk_desc, "/gpx/trk/desc" },
124 { tt_trk_trkseg, "/gpx/trk/trkseg" },
125 { tt_trk_trkseg_trkpt, "/gpx/trk/trkseg/trkpt" },
126 { tt_trk_trkseg_trkpt_ele, "/gpx/trk/trkseg/trkpt/ele" },
127 { tt_trk_trkseg_trkpt_time, "/gpx/trk/trkseg/trkpt/time" },
129 { tt_trk_trkseg_trkpt_course, "/gpx/trk/trkseg/trkpt/course" },
130 { tt_trk_trkseg_trkpt_speed, "/gpx/trk/trkseg/trkpt/speed" },
131 { tt_trk_trkseg_trkpt_fix, "/gpx/trk/trkseg/trkpt/fix" },
132 { tt_trk_trkseg_trkpt_sat, "/gpx/trk/trkseg/trkpt/sat" },
134 { tt_trk_trkseg_trkpt_hdop, "/gpx/trk/trkseg/trkpt/hdop" },
135 { tt_trk_trkseg_trkpt_vdop, "/gpx/trk/trkseg/trkpt/vdop" },
136 { tt_trk_trkseg_trkpt_pdop, "/gpx/trk/trkseg/trkpt/pdop" },
138 { tt_rte, "/gpx/rte" },
139 // NB Route reuses track point feature tags
140 { tt_trk_name, "/gpx/rte/name" },
141 { tt_trk_cmt, "/gpx/rte/cmt" },
142 { tt_trk_desc, "/gpx/rte/desc" },
143 { tt_trk_trkseg_trkpt, "/gpx/rte/rtept" },
144 { tt_trk_trkseg_trkpt_ele, "/gpx/rte/rtept/ele" },
149 static tag_type get_tag(const char *t)
152 for (tm = tag_path_map; tm->tag_type != 0; tm++)
153 if (0 == strcmp(tm->tag_name, t))
158 /******************************************/
160 tag_type current_tag = tt_unknown;
161 GString *xpath = NULL;
162 GString *c_cdata = NULL;
164 /* current ("c_") objects */
165 VikTrackpoint *c_tp = NULL;
166 VikWaypoint *c_wp = NULL;
167 VikTrack *c_tr = NULL;
169 gchar *c_wp_name = NULL;
170 gchar *c_tr_name = NULL;
172 /* temporary things so we don't have to create them lots of times */
173 const gchar *c_slat, *c_slon;
176 /* specialty flags / etc */
177 gboolean f_tr_newseg;
178 guint unnamed_waypoints = 0;
179 guint unnamed_tracks = 0;
180 guint unnamed_routes = 0;
182 static const char *get_attr ( const char **attr, const char *key )
185 if ( strcmp(*attr,key) == 0 )
192 static gboolean set_c_ll ( const char **attr )
194 if ( (c_slat = get_attr ( attr, "lat" )) && (c_slon = get_attr ( attr, "lon" )) ) {
195 c_ll.lat = g_ascii_strtod(c_slat, NULL);
196 c_ll.lon = g_ascii_strtod(c_slon, NULL);
202 static void gpx_start(VikTrwLayer *vtl, const char *el, const char **attr)
204 static const gchar *tmp;
206 g_string_append_c ( xpath, '/' );
207 g_string_append ( xpath, el );
208 current_tag = get_tag ( xpath->str );
210 switch ( current_tag ) {
213 if ( set_c_ll( attr ) ) {
214 c_wp = vik_waypoint_new ();
215 c_wp->visible = TRUE;
216 if ( get_attr ( attr, "hidden" ) )
217 c_wp->visible = FALSE;
219 vik_coord_load_from_latlon ( &(c_wp->coord), vik_trw_layer_get_coord_mode ( vtl ), &c_ll );
225 c_tr = vik_track_new ();
226 c_tr->is_route = (current_tag == tt_rte) ? TRUE : FALSE;
227 c_tr->visible = TRUE;
228 if ( get_attr ( attr, "hidden" ) )
229 c_tr->visible = FALSE;
236 case tt_trk_trkseg_trkpt:
237 if ( set_c_ll( attr ) ) {
238 c_tp = vik_trackpoint_new ();
239 vik_coord_load_from_latlon ( &(c_tp->coord), vik_trw_layer_get_coord_mode ( vtl ), &c_ll );
241 c_tp->newsegment = TRUE;
244 c_tr->trackpoints = g_list_append ( c_tr->trackpoints, c_tp );
248 case tt_trk_trkseg_trkpt_ele:
249 case tt_trk_trkseg_trkpt_time:
259 g_string_erase ( c_cdata, 0, -1 ); /* clear the cdata buffer */
263 c_wp = vik_waypoint_new ();
264 c_wp->visible = TRUE;
267 case tt_waypoint_coord:
268 if ( set_c_ll( attr ) )
269 vik_coord_load_from_latlon ( &(c_wp->coord), vik_trw_layer_get_coord_mode ( vtl ), &c_ll );
272 case tt_waypoint_name:
273 if ( ( tmp = get_attr(attr, "id") ) ) {
275 g_free ( c_wp_name );
276 c_wp_name = g_strdup ( tmp );
278 g_string_erase ( c_cdata, 0, -1 ); /* clear the cdata buffer for description */
285 static void gpx_end(VikTrwLayer *vtl, const char *el)
287 static GTimeVal tp_time;
288 static GTimeVal wp_time;
290 g_string_truncate ( xpath, xpath->len - strlen(el) - 1 );
292 switch ( current_tag ) {
297 c_wp_name = g_strdup_printf("VIKING_WP%04d", unnamed_waypoints++);
298 vik_trw_layer_filein_add_waypoint ( vtl, c_wp_name, c_wp );
299 g_free ( c_wp_name );
306 c_tr_name = g_strdup_printf("VIKING_TR%03d", unnamed_tracks++);
307 // Delibrate fall through
310 c_tr_name = g_strdup_printf("VIKING_RT%03d", unnamed_routes++);
311 vik_trw_layer_filein_add_track ( vtl, c_tr_name, c_tr );
312 g_free ( c_tr_name );
319 g_free ( c_wp_name );
320 c_wp_name = g_strdup ( c_cdata->str );
321 g_string_erase ( c_cdata, 0, -1 );
326 g_free ( c_tr_name );
327 c_tr_name = g_strdup ( c_cdata->str );
328 g_string_erase ( c_cdata, 0, -1 );
332 c_wp->altitude = g_ascii_strtod ( c_cdata->str, NULL );
333 g_string_erase ( c_cdata, 0, -1 );
336 case tt_trk_trkseg_trkpt_ele:
337 c_tp->altitude = g_ascii_strtod ( c_cdata->str, NULL );
338 g_string_erase ( c_cdata, 0, -1 );
341 case tt_waypoint_name: /* .loc name is really description. */
343 vik_waypoint_set_description ( c_wp, c_cdata->str );
344 g_string_erase ( c_cdata, 0, -1 );
348 vik_waypoint_set_comment ( c_wp, c_cdata->str );
349 g_string_erase ( c_cdata, 0, -1 );
353 vik_waypoint_set_image ( c_wp, c_cdata->str );
354 g_string_erase ( c_cdata, 0, -1 );
358 vik_waypoint_set_symbol ( c_wp, c_cdata->str );
359 g_string_erase ( c_cdata, 0, -1 );
364 vik_track_set_description ( c_tr, c_cdata->str );
365 g_string_erase ( c_cdata, 0, -1 );
369 vik_track_set_comment ( c_tr, c_cdata->str );
370 g_string_erase ( c_cdata, 0, -1 );
374 if ( g_time_val_from_iso8601(c_cdata->str, &wp_time) ) {
375 c_wp->timestamp = wp_time.tv_sec;
376 c_wp->has_timestamp = TRUE;
378 g_string_erase ( c_cdata, 0, -1 );
381 case tt_trk_trkseg_trkpt_time:
382 if ( g_time_val_from_iso8601(c_cdata->str, &tp_time) ) {
383 c_tp->timestamp = tp_time.tv_sec;
384 c_tp->has_timestamp = TRUE;
386 g_string_erase ( c_cdata, 0, -1 );
389 case tt_trk_trkseg_trkpt_course:
390 c_tp->course = g_ascii_strtod ( c_cdata->str, NULL );
391 g_string_erase ( c_cdata, 0, -1 );
394 case tt_trk_trkseg_trkpt_speed:
395 c_tp->speed = g_ascii_strtod ( c_cdata->str, NULL );
396 g_string_erase ( c_cdata, 0, -1 );
399 case tt_trk_trkseg_trkpt_fix:
400 if (!strcmp("2d", c_cdata->str))
401 c_tp->fix_mode = VIK_GPS_MODE_2D;
402 else if (!strcmp("3d", c_cdata->str))
403 c_tp->fix_mode = VIK_GPS_MODE_3D;
404 else /* TODO: more fix modes here */
405 c_tp->fix_mode = VIK_GPS_MODE_NOT_SEEN;
406 g_string_erase ( c_cdata, 0, -1 );
409 case tt_trk_trkseg_trkpt_sat:
410 c_tp->nsats = atoi ( c_cdata->str );
411 g_string_erase ( c_cdata, 0, -1 );
414 case tt_trk_trkseg_trkpt_hdop:
415 c_tp->hdop = g_strtod ( c_cdata->str, NULL );
416 g_string_erase ( c_cdata, 0, -1 );
419 case tt_trk_trkseg_trkpt_vdop:
420 c_tp->vdop = g_strtod ( c_cdata->str, NULL );
421 g_string_erase ( c_cdata, 0, -1 );
424 case tt_trk_trkseg_trkpt_pdop:
425 c_tp->pdop = g_strtod ( c_cdata->str, NULL );
426 g_string_erase ( c_cdata, 0, -1 );
432 current_tag = get_tag ( xpath->str );
435 static void gpx_cdata(void *dta, const XML_Char *s, int len)
437 switch ( current_tag ) {
441 case tt_trk_trkseg_trkpt_ele:
448 case tt_trk_trkseg_trkpt_time:
450 case tt_trk_trkseg_trkpt_course:
451 case tt_trk_trkseg_trkpt_speed:
452 case tt_trk_trkseg_trkpt_fix:
453 case tt_trk_trkseg_trkpt_sat:
454 case tt_trk_trkseg_trkpt_hdop:
455 case tt_trk_trkseg_trkpt_vdop:
456 case tt_trk_trkseg_trkpt_pdop:
457 case tt_waypoint_name: /* .loc name is really description. */
458 g_string_append_len ( c_cdata, s, len );
461 default: break; /* ignore cdata from other things */
465 // make like a "stack" of tag names
466 // like gpspoint's separated like /gpx/wpt/whatever
468 gboolean a_gpx_read_file( VikTrwLayer *vtl, FILE *f ) {
469 XML_Parser parser = XML_ParserCreate(NULL);
471 enum XML_Status status = XML_STATUS_ERROR;
473 XML_SetElementHandler(parser, (XML_StartElementHandler) gpx_start, (XML_EndElementHandler) gpx_end);
474 XML_SetUserData(parser, vtl); /* in the future we could remove all global variables */
475 XML_SetCharacterDataHandler(parser, (XML_CharacterDataHandler) gpx_cdata);
479 g_assert ( f != NULL && vtl != NULL );
481 xpath = g_string_new ( "" );
482 c_cdata = g_string_new ( "" );
484 unnamed_waypoints = 1;
489 len = fread(buf, 1, sizeof(buf)-7, f);
490 done = feof(f) || !len;
491 status = XML_Parse(parser, buf, len, done);
494 XML_ParserFree (parser);
495 g_string_free ( xpath, TRUE );
496 g_string_free ( c_cdata, TRUE );
498 return status != XML_STATUS_ERROR;
501 /**** entitize from GPSBabel ****/
509 entity_types stdentities[] = {
511 { "'", "'", 1 },
514 { "\"", """, 0 },
518 void utf8_to_int( const char *cp, int *bytes, int *value )
520 if ( (*cp & 0xe0) == 0xc0 ) {
521 if ( (*(cp+1) & 0xc0) != 0x80 ) goto dodefault;
523 *value = ((*cp & 0x1f) << 6) |
526 else if ( (*cp & 0xf0) == 0xe0 ) {
527 if ( (*(cp+1) & 0xc0) != 0x80 ) goto dodefault;
528 if ( (*(cp+2) & 0xc0) != 0x80 ) goto dodefault;
530 *value = ((*cp & 0x0f) << 12) |
531 ((*(cp+1) & 0x3f) << 6) |
534 else if ( (*cp & 0xf8) == 0xf0 ) {
535 if ( (*(cp+1) & 0xc0) != 0x80 ) goto dodefault;
536 if ( (*(cp+2) & 0xc0) != 0x80 ) goto dodefault;
537 if ( (*(cp+3) & 0xc0) != 0x80 ) goto dodefault;
539 *value = ((*cp & 0x07) << 18) |
540 ((*(cp+1) & 0x3f) << 12) |
541 ((*(cp+2) & 0x3f) << 6) |
544 else if ( (*cp & 0xfc) == 0xf8 ) {
545 if ( (*(cp+1) & 0xc0) != 0x80 ) goto dodefault;
546 if ( (*(cp+2) & 0xc0) != 0x80 ) goto dodefault;
547 if ( (*(cp+3) & 0xc0) != 0x80 ) goto dodefault;
548 if ( (*(cp+4) & 0xc0) != 0x80 ) goto dodefault;
550 *value = ((*cp & 0x03) << 24) |
551 ((*(cp+1) & 0x3f) << 18) |
552 ((*(cp+2) & 0x3f) << 12) |
553 ((*(cp+3) & 0x3f) << 6) |
556 else if ( (*cp & 0xfe) == 0xfc ) {
557 if ( (*(cp+1) & 0xc0) != 0x80 ) goto dodefault;
558 if ( (*(cp+2) & 0xc0) != 0x80 ) goto dodefault;
559 if ( (*(cp+3) & 0xc0) != 0x80 ) goto dodefault;
560 if ( (*(cp+4) & 0xc0) != 0x80 ) goto dodefault;
561 if ( (*(cp+5) & 0xc0) != 0x80 ) goto dodefault;
563 *value = ((*cp & 0x01) << 30) |
564 ((*(cp+1) & 0x3f) << 24) |
565 ((*(cp+2) & 0x3f) << 18) |
566 ((*(cp+3) & 0x3f) << 12) |
567 ((*(cp+4) & 0x3f) << 6) |
573 *value = (unsigned char)*cp;
579 entitize(const char * str)
581 int elen, ecount, nsecount;
584 char * p, * tmp, * xstr;
590 elen = ecount = nsecount = 0;
592 /* figure # of entity replacements and additional size. */
595 while ((cp = strstr(cp, ep->text)) != NULL) {
596 elen += strlen(ep->entity) - strlen(ep->text);
598 cp += strlen(ep->text);
603 /* figure the same for other than standard entities (i.e. anything
604 * that isn't in the range U+0000 to U+007F */
605 for ( cp = str; *cp; cp++ ) {
608 utf8_to_int( cp, &bytes, &value );
610 elen += sprintf( tmpsub, "&#x%x;", value ) - bytes;
615 /* enough space for the whole string plus entity replacements, if any */
616 tmp = g_malloc((strlen(str) + elen + 1));
619 /* no entity replacements */
620 if (ecount == 0 && nsecount == 0)
624 for (ep = stdentities; ep->text; ep++) {
626 while ((p = strstr(p, ep->text)) != NULL) {
627 elen = strlen(ep->entity);
629 xstr = g_strdup(p + strlen(ep->text));
631 strcpy(p, ep->entity);
632 strcpy(p + elen, xstr);
641 if ( nsecount != 0 ) {
645 utf8_to_int( p, &bytes, &value );
647 xstr = g_strdup( p + bytes );
652 sprintf( p, "&#x%x;", value );
666 /**** end GPSBabel code ****/
670 static void gpx_write_waypoint ( VikWaypoint *wp, GpxWritingContext *context )
672 // Don't write invisible waypoints when specified
673 if (context->options && !context->options->hidden && !wp->visible)
676 FILE *f = context->file;
677 static struct LatLon ll;
680 vik_coord_to_latlon ( &(wp->coord), &ll );
681 s_lat = a_coords_dtostr( ll.lat );
682 s_lon = a_coords_dtostr( ll.lon );
683 // NB 'hidden' is not part of any GPX standard - this appears to be a made up Viking 'extension'
684 // luckily most other GPX processing software ignores things they don't understand
685 fprintf ( f, "<wpt lat=\"%s\" lon=\"%s\"%s>\n",
686 s_lat, s_lon, wp->visible ? "" : " hidden=\"hidden\"" );
692 tmp = entitize ( wp->name );
694 tmp = g_strdup ("waypoint");
696 fprintf ( f, " <name>%s</name>\n", tmp );
699 if ( wp->altitude != VIK_DEFAULT_ALTITUDE )
701 tmp = a_coords_dtostr ( wp->altitude );
702 fprintf ( f, " <ele>%s</ele>\n", tmp );
706 if ( wp->has_timestamp ) {
708 timestamp.tv_sec = wp->timestamp;
709 timestamp.tv_usec = 0;
711 gchar *time_iso8601 = g_time_val_to_iso8601 ( ×tamp );
712 if ( time_iso8601 != NULL )
713 fprintf ( f, " <time>%s</time>\n", time_iso8601 );
714 g_free ( time_iso8601 );
719 tmp = entitize(wp->comment);
720 fprintf ( f, " <cmt>%s</cmt>\n", tmp );
723 if ( wp->description )
725 tmp = entitize(wp->description);
726 fprintf ( f, " <desc>%s</desc>\n", tmp );
731 tmp = entitize(wp->image);
732 fprintf ( f, " <link>%s</link>\n", tmp );
737 tmp = entitize(wp->symbol);
738 if ( a_vik_gpx_export_wpt_sym_name ( ) ) {
739 // Lowercase the symbol name
740 gchar *tmp2 = g_utf8_strdown ( tmp, -1 );
741 fprintf ( f, " <sym>%s</sym>\n", tmp2 );
745 fprintf ( f, " <sym>%s</sym>\n", tmp);
749 fprintf ( f, "</wpt>\n" );
752 static void gpx_write_trackpoint ( VikTrackpoint *tp, GpxWritingContext *context )
754 FILE *f = context->file;
755 static struct LatLon ll;
756 gchar *s_lat,*s_lon, *s_alt, *s_dop;
758 vik_coord_to_latlon ( &(tp->coord), &ll );
760 // No such thing as a rteseg! So make sure we don't put them in
761 if ( context->options && !context->options->is_route && tp->newsegment )
762 fprintf ( f, " </trkseg>\n <trkseg>\n" );
764 s_lat = a_coords_dtostr( ll.lat );
765 s_lon = a_coords_dtostr( ll.lon );
766 fprintf ( f, " <%spt lat=\"%s\" lon=\"%s\">\n", (context->options && context->options->is_route) ? "rte" : "trk", s_lat, s_lon );
767 g_free ( s_lat ); s_lat = NULL;
768 g_free ( s_lon ); s_lon = NULL;
771 if ( tp->altitude != VIK_DEFAULT_ALTITUDE )
773 s_alt = a_coords_dtostr ( tp->altitude );
775 else if ( context->options != NULL && context->options->force_ele )
777 s_alt = a_coords_dtostr ( 0 );
780 fprintf ( f, " <ele>%s</ele>\n", s_alt );
781 g_free ( s_alt ); s_alt = NULL;
784 if ( tp->has_timestamp ) {
786 timestamp.tv_sec = tp->timestamp;
787 timestamp.tv_usec = 0;
789 time_iso8601 = g_time_val_to_iso8601 ( ×tamp );
791 else if ( context->options != NULL && context->options->force_time )
794 g_get_current_time ( ¤t );
796 time_iso8601 = g_time_val_to_iso8601 ( ¤t );
798 if ( time_iso8601 != NULL )
799 fprintf ( f, " <time>%s</time>\n", time_iso8601 );
800 g_free(time_iso8601);
803 if (!isnan(tp->course)) {
804 gchar *s_course = a_coords_dtostr(tp->course);
805 fprintf ( f, " <course>%s</course>\n", s_course );
808 if (!isnan(tp->speed)) {
809 gchar *s_speed = a_coords_dtostr(tp->speed);
810 fprintf ( f, " <speed>%s</speed>\n", s_speed );
813 if (tp->fix_mode == VIK_GPS_MODE_2D)
814 fprintf ( f, " <fix>2d</fix>\n");
815 if (tp->fix_mode == VIK_GPS_MODE_3D)
816 fprintf ( f, " <fix>3d</fix>\n");
818 fprintf ( f, " <sat>%d</sat>\n", tp->nsats );
821 if ( tp->hdop != VIK_DEFAULT_DOP )
823 s_dop = a_coords_dtostr ( tp->hdop );
826 fprintf ( f, " <hdop>%s</hdop>\n", s_dop );
827 g_free ( s_dop ); s_dop = NULL;
829 if ( tp->vdop != VIK_DEFAULT_DOP )
831 s_dop = a_coords_dtostr ( tp->vdop );
834 fprintf ( f, " <vdop>%s</vdop>\n", s_dop );
835 g_free ( s_dop ); s_dop = NULL;
837 if ( tp->pdop != VIK_DEFAULT_DOP )
839 s_dop = a_coords_dtostr ( tp->pdop );
842 fprintf ( f, " <pdop>%s</pdop>\n", s_dop );
843 g_free ( s_dop ); s_dop = NULL;
845 fprintf ( f, " </%spt>\n", (context->options && context->options->is_route) ? "rte" : "trk" );
849 static void gpx_write_track ( VikTrack *t, GpxWritingContext *context )
851 // Don't write invisible tracks when specified
852 if (context->options && !context->options->hidden && !t->visible)
855 FILE *f = context->file;
857 gboolean first_tp_is_newsegment = FALSE; /* must temporarily make it not so, but we want to restore state. not that it matters. */
861 tmp = entitize ( t->name );
863 tmp = g_strdup ("track");
865 // NB 'hidden' is not part of any GPX standard - this appears to be a made up Viking 'extension'
866 // luckily most other GPX processing software ignores things they don't understand
867 fprintf ( f, "<%s%s>\n <name>%s</name>\n",
868 t->is_route ? "rte" : "trk",
869 t->visible ? "" : " hidden=\"hidden\"",
875 tmp = entitize ( t->comment );
876 fprintf ( f, " <cmt>%s</cmt>\n", tmp );
880 if ( t->description )
882 tmp = entitize ( t->description );
883 fprintf ( f, " <desc>%s</desc>\n", tmp );
887 /* No such thing as a rteseg! */
889 fprintf ( f, " <trkseg>\n" );
891 if ( t->trackpoints && t->trackpoints->data ) {
892 first_tp_is_newsegment = VIK_TRACKPOINT(t->trackpoints->data)->newsegment;
893 VIK_TRACKPOINT(t->trackpoints->data)->newsegment = FALSE; /* so we won't write </trkseg><trkseg> already */
894 g_list_foreach ( t->trackpoints, (GFunc) gpx_write_trackpoint, context );
895 VIK_TRACKPOINT(t->trackpoints->data)->newsegment = first_tp_is_newsegment; /* restore state */
898 /* NB apparently no such thing as a rteseg! */
900 fprintf ( f, " </trkseg>\n");
902 fprintf ( f, "</%s>\n", t->is_route ? "rte" : "trk" );
905 static void gpx_write_header( FILE *f )
907 fprintf(f, "<?xml version=\"1.0\"?>\n"
908 "<gpx version=\"1.0\" creator=\"Viking -- http://viking.sf.net/\"\n"
909 "xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n"
910 "xmlns=\"http://www.topografix.com/GPX/1/0\"\n"
911 "xsi:schemaLocation=\"http://www.topografix.com/GPX/1/0 http://www.topografix.com/GPX/1/0/gpx.xsd\">\n");
914 static void gpx_write_footer( FILE *f )
916 fprintf(f, "</gpx>\n");
919 static int gpx_waypoint_compare(const void *x, const void *y)
921 VikWaypoint *a = (VikWaypoint *)x;
922 VikWaypoint *b = (VikWaypoint *)y;
923 return strcmp(a->name,b->name);
926 static int gpx_track_compare_name(const void *x, const void *y)
928 VikTrack *a = (VikTrack *)x;
929 VikTrack *b = (VikTrack *)y;
930 return strcmp(a->name,b->name);
933 /* Function to compare two tracks by their first timestamp */
934 static int gpx_track_compare_timestamp (const void *x, const void *y)
936 VikTrack *a = (VikTrack *)x;
937 VikTrack *b = (VikTrack *)y;
939 VikTrackpoint *tpa = NULL;
940 VikTrackpoint *tpb = NULL;
942 if ( a->trackpoints )
943 tpa = VIK_TRACKPOINT(g_list_first(a->trackpoints)->data);
945 if ( b->trackpoints )
946 tpb = VIK_TRACKPOINT(g_list_first(b->trackpoints)->data);
949 if ( tpa->timestamp < tpb->timestamp )
951 if ( tpa->timestamp > tpb->timestamp )
964 void a_gpx_write_file ( VikTrwLayer *vtl, FILE *f, GpxWritingOptions *options )
966 GpxWritingContext context = { options, f };
968 gpx_write_header ( f );
970 // gather waypoints in a list, then sort
971 // g_hash_table_get_values: glib 2.14+
972 GList *gl = g_hash_table_get_values ( vik_trw_layer_get_waypoints ( vtl ) );
973 gl = g_list_sort ( gl, gpx_waypoint_compare );
976 for (iter = g_list_first (gl); iter != NULL; iter = g_list_next (iter)) {
977 gpx_write_waypoint ( (VikWaypoint*)iter->data, &context );
982 //gl = g_hash_table_get_values ( vik_trw_layer_get_tracks ( vtl ) );
983 // Forming the list manually seems to produce one that is more likely to be nearer to the creation order
986 GHashTableIter ght_iter;
987 g_hash_table_iter_init ( &ght_iter, vik_trw_layer_get_tracks ( vtl ) );
988 while ( g_hash_table_iter_next (&ght_iter, &key, &value) ) {
989 gl = g_list_prepend ( gl ,value );
991 gl = g_list_reverse ( gl );
993 // Sort method determined by preference
994 if ( a_vik_get_gpx_export_trk_sort() == VIK_GPX_EXPORT_TRK_SORT_TIME )
995 gl = g_list_sort ( gl, gpx_track_compare_timestamp );
996 else if ( a_vik_get_gpx_export_trk_sort() == VIK_GPX_EXPORT_TRK_SORT_ALPHA )
997 gl = g_list_sort ( gl, gpx_track_compare_name );
999 // Routes sorted by name
1000 GList *glrte = g_hash_table_get_values ( vik_trw_layer_get_routes ( vtl ) );
1001 glrte = g_list_sort ( glrte, gpx_track_compare_name );
1003 // g_list_concat doesn't copy memory properly
1004 // so process each list separately
1006 GpxWritingContext context_tmp = context;
1007 GpxWritingOptions opt_tmp = { FALSE, FALSE, FALSE };
1008 // Force trackpoints on tracks
1009 if ( !context.options )
1010 context_tmp.options = &opt_tmp;
1011 context_tmp.options->is_route = FALSE;
1013 // Loop around each list and write each one
1014 for (iter = g_list_first (gl); iter != NULL; iter = g_list_next (iter)) {
1015 gpx_write_track ( (VikTrack*)iter->data, &context_tmp );
1018 // Routes (to get routepoints)
1019 context_tmp.options->is_route = TRUE;
1020 for (iter = g_list_first (glrte); iter != NULL; iter = g_list_next (iter)) {
1021 gpx_write_track ( (VikTrack*)iter->data, &context_tmp );
1025 g_list_free ( glrte );
1027 gpx_write_footer ( f );
1030 void a_gpx_write_track_file ( VikTrack *trk, FILE *f, GpxWritingOptions *options )
1032 GpxWritingContext context = {options, f};
1033 gpx_write_header ( f );
1034 gpx_write_track ( trk, &context );
1035 gpx_write_footer ( f );