2 * viking -- GPS Data and Topo Analyzer, Explorer, and Manager
4 * Copyright (C) 2003-2005, Evan Battaglia <gtoevan@gmx.net>
6 * Some of the code adapted from GPSBabel 1.2.7
7 * http://gpsbabel.sf.net/
8 * Copyright (C) 2002, 2003, 2004, 2005 Robert Lipe, robertlipe@usa.net
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 #define _XOPEN_SOURCE /* glibc2 needs this */
35 #define GPX_TIME_FORMAT "%Y-%m-%dT%H:%M:%SZ"
47 tt_wpt_link, /* New in GPX 1.1 */
55 tt_trk_trkseg_trkpt_ele,
56 tt_trk_trkseg_trkpt_time,
63 typedef struct tag_mapping {
64 tag_type tag_type; /* enum from above for this tag */
65 const char *tag_name; /* xpath-ish tag name */
69 * xpath(ish) mappings between full tag paths and internal identifers.
70 * These appear in the order they appear in the GPX specification.
71 * If it's not a tag we explictly handle, it doesn't go here.
74 tag_mapping tag_path_map[] = {
76 { tt_wpt, "/gpx/wpt" },
78 { tt_waypoint, "/loc/waypoint" },
79 { tt_waypoint_coord, "/loc/waypoint/coord" },
80 { tt_waypoint_name, "/loc/waypoint/name" },
82 { tt_wpt_ele, "/gpx/wpt/ele" },
83 { tt_wpt_name, "/gpx/wpt/name" },
84 { tt_wpt_desc, "/gpx/wpt/desc" },
85 { tt_wpt_sym, "/gpx/wpt/sym" },
86 { tt_wpt_sym, "/loc/waypoint/type" },
87 { tt_wpt_link, "/gpx/wpt/link" }, /* GPX 1.1 */
89 { tt_trk, "/gpx/trk" },
90 { tt_trk, "/gpx/rte" },
91 { tt_trk_name, "/gpx/trk/name" },
92 { tt_trk_desc, "/gpx/trk/desc" },
93 { tt_trk_trkseg, "/gpx/trk/trkseg" },
94 { tt_trk_trkseg_trkpt, "/gpx/trk/trkseg/trkpt" },
95 { tt_trk_trkseg_trkpt, "/gpx/rte/rtept" },
96 { tt_trk_trkseg_trkpt_ele, "/gpx/trk/trkseg/trkpt/ele" },
97 { tt_trk_trkseg_trkpt_time, "/gpx/trk/trkseg/trkpt/time" },
102 static tag_type get_tag(const char *t)
105 for (tm = tag_path_map; tm->tag_type != 0; tm++)
106 if (0 == strcmp(tm->tag_name, t))
111 /******************************************/
113 tag_type current_tag = tt_unknown;
114 GString *xpath = NULL;
115 GString *c_cdata = NULL;
117 /* current ("c_") objects */
118 VikTrackpoint *c_tp = NULL;
119 VikWaypoint *c_wp = NULL;
120 VikTrack *c_tr = NULL;
122 gchar *c_wp_name = NULL;
123 gchar *c_tr_name = NULL;
125 /* temporary things so we don't have to create them lots of times */
126 const gchar *c_slat, *c_slon;
129 /* specialty flags / etc */
130 gboolean f_tr_newseg;
131 guint unnamed_waypoints = 0;
132 guint unnamed_tracks = 0;
135 static const char *get_attr ( const char **attr, const char *key )
138 if ( strcmp(*attr,key) == 0 )
145 static gboolean set_c_ll ( const char **attr )
147 if ( (c_slat = get_attr ( attr, "lat" )) && (c_slon = get_attr ( attr, "lon" )) ) {
148 c_ll.lat = g_strtod(c_slat, NULL);
149 c_ll.lon = g_strtod(c_slon, NULL);
155 static void gpx_start(VikTrwLayer *vtl, const char *el, const char **attr)
157 static const gchar *tmp;
159 g_string_append_c ( xpath, '/' );
160 g_string_append ( xpath, el );
161 current_tag = get_tag ( xpath->str );
163 switch ( current_tag ) {
166 if ( set_c_ll( attr ) ) {
167 c_wp = vik_waypoint_new ();
168 c_wp->altitude = VIK_DEFAULT_ALTITUDE;
169 if ( ! get_attr ( attr, "hidden" ) )
170 c_wp->visible = TRUE;
172 vik_coord_load_from_latlon ( &(c_wp->coord), vik_trw_layer_get_coord_mode ( vtl ), &c_ll );
177 c_tr = vik_track_new ();
178 if ( ! get_attr ( attr, "hidden" ) )
179 c_tr->visible = TRUE;
186 case tt_trk_trkseg_trkpt:
187 if ( set_c_ll( attr ) ) {
188 c_tp = vik_trackpoint_new ();
189 c_tp->altitude = VIK_DEFAULT_ALTITUDE;
190 vik_coord_load_from_latlon ( &(c_tp->coord), vik_trw_layer_get_coord_mode ( vtl ), &c_ll );
192 c_tp->newsegment = TRUE;
195 c_tr->trackpoints = g_list_append ( c_tr->trackpoints, c_tp );
199 case tt_trk_trkseg_trkpt_ele:
200 case tt_trk_trkseg_trkpt_time:
207 g_string_erase ( c_cdata, 0, -1 ); /* clear the cdata buffer */
211 c_wp = vik_waypoint_new ();
212 c_wp->altitude = VIK_DEFAULT_ALTITUDE;
213 c_wp->visible = TRUE;
216 case tt_waypoint_coord:
217 if ( set_c_ll( attr ) )
218 vik_coord_load_from_latlon ( &(c_wp->coord), vik_trw_layer_get_coord_mode ( vtl ), &c_ll );
221 case tt_waypoint_name:
222 if ( ( tmp = get_attr(attr, "id") ) ) {
224 g_free ( c_wp_name );
225 c_wp_name = g_strdup ( tmp );
227 g_string_erase ( c_cdata, 0, -1 ); /* clear the cdata buffer for description */
234 static void gpx_end(VikTrwLayer *vtl, const char *el)
237 g_string_truncate ( xpath, xpath->len - strlen(el) - 1 );
239 switch ( current_tag ) {
244 c_wp_name = g_strdup_printf("VIKING_WP%d", unnamed_waypoints++);
245 vik_trw_layer_filein_add_waypoint ( vtl, c_wp_name, c_wp );
246 g_free ( c_wp_name );
253 c_tr_name = g_strdup_printf("VIKING_TR%d", unnamed_waypoints++);
254 vik_trw_layer_filein_add_track ( vtl, c_tr_name, c_tr );
255 g_free ( c_tr_name );
262 g_free ( c_wp_name );
263 c_wp_name = g_strdup ( c_cdata->str );
264 g_string_erase ( c_cdata, 0, -1 );
269 g_free ( c_tr_name );
270 c_tr_name = g_strdup ( c_cdata->str );
271 g_string_erase ( c_cdata, 0, -1 );
275 c_wp->altitude = g_strtod ( c_cdata->str, NULL );
276 g_string_erase ( c_cdata, 0, -1 );
279 case tt_trk_trkseg_trkpt_ele:
280 c_tp->altitude = g_strtod ( c_cdata->str, NULL );
281 g_string_erase ( c_cdata, 0, -1 );
284 case tt_waypoint_name: /* .loc name is really description. */
286 vik_waypoint_set_comment ( c_wp, c_cdata->str );
287 g_string_erase ( c_cdata, 0, -1 );
291 vik_waypoint_set_image ( c_wp, c_cdata->str );
292 g_string_erase ( c_cdata, 0, -1 );
296 gchar *tmp_lower = g_utf8_strdown(c_cdata->str, -1); /* for things like <type>Geocache</type> */
297 vik_waypoint_set_symbol ( c_wp, tmp_lower );
298 g_free ( tmp_lower );
299 g_string_erase ( c_cdata, 0, -1 );
304 vik_track_set_comment ( c_tr, c_cdata->str );
305 g_string_erase ( c_cdata, 0, -1 );
308 case tt_trk_trkseg_trkpt_time:
310 if ( strptime(c_cdata->str, GPX_TIME_FORMAT, &tm) != c_cdata->str ) { /* it read at least one char */
311 c_tp->timestamp = mktime(&tm);
312 c_tp->has_timestamp = TRUE;
314 g_string_erase ( c_cdata, 0, -1 );
320 current_tag = get_tag ( xpath->str );
323 static void gpx_cdata(void *dta, const XML_Char *s, int len)
325 switch ( current_tag ) {
329 case tt_trk_trkseg_trkpt_ele:
334 case tt_trk_trkseg_trkpt_time:
335 case tt_waypoint_name: /* .loc name is really description. */
336 g_string_append_len ( c_cdata, s, len );
339 default: break; /* ignore cdata from other things */
343 // make like a "stack" of tag names
344 // like gpspoint's separated like /gpx/wpt/whatever
346 void a_gpx_read_file( VikTrwLayer *vtl, FILE *f ) {
347 XML_Parser parser = XML_ParserCreate(NULL);
350 XML_SetElementHandler(parser, (XML_StartElementHandler) gpx_start, (XML_EndElementHandler) gpx_end);
351 XML_SetUserData(parser, vtl); /* in the future we could remove all global variables */
352 XML_SetCharacterDataHandler(parser, (XML_CharacterDataHandler) gpx_cdata);
356 g_assert ( f != NULL && vtl != NULL );
358 xpath = g_string_new ( "" );
359 c_cdata = g_string_new ( "" );
361 unnamed_waypoints = 0;
365 len = fread(buf, 1, sizeof(buf)-7, f);
366 done = feof(f) || !len;
367 XML_Parse(parser, buf, len, done);
370 g_string_free ( xpath, TRUE );
371 g_string_free ( c_cdata, TRUE );
374 /**** entitize from GPSBabel ****/
382 entity_types stdentities[] = {
384 { "'", "'", 1 },
387 { "\"", """, 0 },
391 void utf8_to_int( const char *cp, int *bytes, int *value )
393 if ( (*cp & 0xe0) == 0xc0 ) {
394 if ( (*(cp+1) & 0xc0) != 0x80 ) goto dodefault;
396 *value = ((*cp & 0x1f) << 6) |
399 else if ( (*cp & 0xf0) == 0xe0 ) {
400 if ( (*(cp+1) & 0xc0) != 0x80 ) goto dodefault;
401 if ( (*(cp+2) & 0xc0) != 0x80 ) goto dodefault;
403 *value = ((*cp & 0x0f) << 12) |
404 ((*(cp+1) & 0x3f) << 6) |
407 else if ( (*cp & 0xf8) == 0xf0 ) {
408 if ( (*(cp+1) & 0xc0) != 0x80 ) goto dodefault;
409 if ( (*(cp+2) & 0xc0) != 0x80 ) goto dodefault;
410 if ( (*(cp+3) & 0xc0) != 0x80 ) goto dodefault;
412 *value = ((*cp & 0x07) << 18) |
413 ((*(cp+1) & 0x3f) << 12) |
414 ((*(cp+2) & 0x3f) << 6) |
417 else if ( (*cp & 0xfc) == 0xf8 ) {
418 if ( (*(cp+1) & 0xc0) != 0x80 ) goto dodefault;
419 if ( (*(cp+2) & 0xc0) != 0x80 ) goto dodefault;
420 if ( (*(cp+3) & 0xc0) != 0x80 ) goto dodefault;
421 if ( (*(cp+4) & 0xc0) != 0x80 ) goto dodefault;
423 *value = ((*cp & 0x03) << 24) |
424 ((*(cp+1) & 0x3f) << 18) |
425 ((*(cp+2) & 0x3f) << 12) |
426 ((*(cp+3) & 0x3f) << 6) |
429 else if ( (*cp & 0xfe) == 0xfc ) {
430 if ( (*(cp+1) & 0xc0) != 0x80 ) goto dodefault;
431 if ( (*(cp+2) & 0xc0) != 0x80 ) goto dodefault;
432 if ( (*(cp+3) & 0xc0) != 0x80 ) goto dodefault;
433 if ( (*(cp+4) & 0xc0) != 0x80 ) goto dodefault;
434 if ( (*(cp+5) & 0xc0) != 0x80 ) goto dodefault;
436 *value = ((*cp & 0x01) << 30) |
437 ((*(cp+1) & 0x3f) << 24) |
438 ((*(cp+2) & 0x3f) << 18) |
439 ((*(cp+3) & 0x3f) << 12) |
440 ((*(cp+4) & 0x3f) << 6) |
446 *value = (unsigned char)*cp;
452 entitize(const char * str)
454 int elen, ecount, nsecount;
457 char * p, * tmp, * xstr;
463 elen = ecount = nsecount = 0;
465 /* figure # of entity replacements and additional size. */
468 while ((cp = strstr(cp, ep->text)) != NULL) {
469 elen += strlen(ep->entity) - strlen(ep->text);
471 cp += strlen(ep->text);
476 /* figure the same for other than standard entities (i.e. anything
477 * that isn't in the range U+0000 to U+007F */
478 for ( cp = str; *cp; cp++ ) {
481 utf8_to_int( cp, &bytes, &value );
483 elen += sprintf( tmpsub, "&#x%x;", value ) - bytes;
488 /* enough space for the whole string plus entity replacements, if any */
489 tmp = g_malloc((strlen(str) + elen + 1));
492 /* no entity replacements */
493 if (ecount == 0 && nsecount == 0)
497 for (ep = stdentities; ep->text; ep++) {
499 while ((p = strstr(p, ep->text)) != NULL) {
500 elen = strlen(ep->entity);
502 xstr = g_strdup(p + strlen(ep->text));
504 strcpy(p, ep->entity);
505 strcpy(p + elen, xstr);
514 if ( nsecount != 0 ) {
518 utf8_to_int( p, &bytes, &value );
520 xstr = g_strdup( p + bytes );
525 sprintf( p, "&#x%x;", value );
539 /**** end GPSBabel code ****/
543 static void gpx_write_waypoint ( const gchar *name, VikWaypoint *wp, FILE *f )
545 static struct LatLon ll;
548 vik_coord_to_latlon ( &(wp->coord), &ll );
549 s_lat = a_coords_dtostr( ll.lat );
550 s_lon = a_coords_dtostr( ll.lon );
551 fprintf ( f, "<wpt lat=\"%s\" lon=\"%s\"%s>\n",
552 s_lat, s_lon, wp->visible ? "" : " hidden=\"hidden\"" );
556 tmp = entitize ( name );
557 fprintf ( f, " <name>%s</name>\n", tmp );
560 if ( wp->altitude != VIK_DEFAULT_ALTITUDE )
562 tmp = a_coords_dtostr ( wp->altitude );
563 fprintf ( f, " <ele>%s</ele>\n", tmp );
568 tmp = entitize(wp->comment);
569 fprintf ( f, " <desc>%s</desc>\n", tmp );
574 tmp = entitize(wp->image);
575 fprintf ( f, " <link>%s</link>\n", tmp );
580 tmp = entitize(wp->symbol);
581 fprintf ( f, " <sym>%s</sym>\n", tmp);
585 fprintf ( f, "</wpt>\n" );
588 static void gpx_write_trackpoint ( VikTrackpoint *tp, FILE *f )
590 static struct LatLon ll;
591 gchar *s_lat,*s_lon, *s_alt;
592 static gchar time_buf[30];
593 vik_coord_to_latlon ( &(tp->coord), &ll );
595 if ( tp->newsegment )
596 fprintf ( f, " </trkseg>\n <trkseg>\n" );
598 s_lat = a_coords_dtostr( ll.lat );
599 s_lon = a_coords_dtostr( ll.lon );
600 fprintf ( f, " <trkpt lat=\"%s\" lon=\"%s\">\n", s_lat, s_lon );
604 if ( tp->altitude != VIK_DEFAULT_ALTITUDE )
606 s_alt = a_coords_dtostr ( tp->altitude );
607 fprintf ( f, " <ele>%s</ele>\n", s_alt );
610 if ( tp->has_timestamp ) {
611 time_buf [ strftime ( time_buf, sizeof(time_buf)-1, GPX_TIME_FORMAT, localtime(&(tp->timestamp)) ) ] = '\0';
612 fprintf ( f, " <time>%s</time>\n", time_buf );
614 fprintf ( f, " </trkpt>\n" );
618 static void gpx_write_track ( const gchar *name, VikTrack *t, FILE *f )
621 gboolean first_tp_is_newsegment; /* must temporarily make it not so, but we want to restore state. not that it matters. */
623 tmp = entitize ( name );
624 fprintf ( f, "<trk%s>\n <name>%s</name>\n", t->visible ? "" : " hidden=\"hidden\"", tmp );
629 tmp = entitize ( t->comment );
630 fprintf ( f, " <desc>%s</desc>\n", tmp );
634 fprintf ( f, " <trkseg>\n" );
636 if ( t->trackpoints && t->trackpoints->data ) {
637 first_tp_is_newsegment = VIK_TRACKPOINT(t->trackpoints->data)->newsegment;
638 VIK_TRACKPOINT(t->trackpoints->data)->newsegment = FALSE; /* so we won't write </trkseg><trkseg> already */
640 g_list_foreach ( t->trackpoints, (GFunc) gpx_write_trackpoint, f );
641 if ( t->trackpoints && t->trackpoints->data )
642 VIK_TRACKPOINT(t->trackpoints->data)->newsegment = first_tp_is_newsegment; /* restore state */
644 fprintf ( f, "</trkseg>\n</trk>\n" );
647 void a_gpx_write_file( VikTrwLayer *vtl, FILE *f )
649 fprintf(f, "<?xml version=\"1.0\"?>\n"
650 "<gpx version=\"1.0\" creator=\"Viking -- http://viking.sf.net/\"\n"
651 "xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n"
652 "xmlns=\"http://www.topografix.com/GPX/1/0\"\n"
653 "xsi:schemaLocation=\"http://www.topografix.com/GPX/1/0 http://www.topografix.com/GPX/1/0/gpx.xsd\">\n");
654 g_hash_table_foreach ( vik_trw_layer_get_waypoints ( vtl ), (GHFunc) gpx_write_waypoint, f );
655 g_hash_table_foreach ( vik_trw_layer_get_tracks ( vtl ), (GHFunc) gpx_write_track, f );
656 fprintf(f, "</gpx>\n");