/*
* viking -- GPS Data and Topo Analyzer, Explorer, and Manager
*
* Copyright (C) 2003-2007, Evan Battaglia <gtoevan@gmx.net>
* Copyright (C) 2007, Quy Tonthat <qtonthat@gmail.com>
* Copyright (C) 2008, Hein Ragas <viking@ragas.nl>
* Copyright (C) 2009, Tal B <tal.bav@gmail.com>
*
* Some of the code adapted from GPSBabel 1.2.7
* http://gpsbabel.sf.net/
* Copyright (C) 2002, 2003, 2004, 2005 Robert Lipe, robertlipe@usa.net
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#define _XOPEN_SOURCE /* glibc2 needs this */
#include "gpx.h"
#include "viking.h"
#include <expat.h>
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <glib.h>
#ifdef HAVE_MATH_H
#include <math.h>
#endif
#include <time.h>
typedef enum {
tt_unknown = 0,
tt_gpx,
tt_wpt,
tt_wpt_desc,
tt_wpt_name,
tt_wpt_ele,
tt_wpt_sym,
tt_wpt_link, /* New in GPX 1.1 */
tt_trk,
tt_trk_desc,
tt_trk_name,
tt_trk_trkseg,
tt_trk_trkseg_trkpt,
tt_trk_trkseg_trkpt_ele,
tt_trk_trkseg_trkpt_time,
/* extended */
tt_trk_trkseg_trkpt_course,
tt_trk_trkseg_trkpt_speed,
tt_trk_trkseg_trkpt_fix,
tt_trk_trkseg_trkpt_sat,
tt_trk_trkseg_trkpt_hdop,
tt_trk_trkseg_trkpt_vdop,
tt_trk_trkseg_trkpt_pdop,
tt_waypoint,
tt_waypoint_coord,
tt_waypoint_name,
} tag_type;
typedef struct tag_mapping {
tag_type tag_type; /* enum from above for this tag */
const char *tag_name; /* xpath-ish tag name */
} tag_mapping;
typedef struct {
GpxWritingOptions *options;
FILE *file;
} GpxWritingContext;
/*
* xpath(ish) mappings between full tag paths and internal identifers.
* These appear in the order they appear in the GPX specification.
* If it's not a tag we explictly handle, it doesn't go here.
*/
tag_mapping tag_path_map[] = {
{ tt_wpt, "/gpx/wpt" },
{ tt_waypoint, "/loc/waypoint" },
{ tt_waypoint_coord, "/loc/waypoint/coord" },
{ tt_waypoint_name, "/loc/waypoint/name" },
{ tt_wpt_ele, "/gpx/wpt/ele" },
{ tt_wpt_name, "/gpx/wpt/name" },
{ tt_wpt_desc, "/gpx/wpt/desc" },
{ tt_wpt_sym, "/gpx/wpt/sym" },
{ tt_wpt_sym, "/loc/waypoint/type" },
{ tt_wpt_link, "/gpx/wpt/link" }, /* GPX 1.1 */
{ tt_trk, "/gpx/trk" },
{ tt_trk, "/gpx/rte" },
{ tt_trk_name, "/gpx/trk/name" },
{ tt_trk_desc, "/gpx/trk/desc" },
{ tt_trk_trkseg, "/gpx/trk/trkseg" },
{ tt_trk_trkseg_trkpt, "/gpx/trk/trkseg/trkpt" },
{ tt_trk_trkseg_trkpt, "/gpx/rte/rtept" },
{ tt_trk_trkseg_trkpt_ele, "/gpx/trk/trkseg/trkpt/ele" },
{ tt_trk_trkseg_trkpt_time, "/gpx/trk/trkseg/trkpt/time" },
/* extended */
{ tt_trk_trkseg_trkpt_course, "/gpx/trk/trkseg/trkpt/course" },
{ tt_trk_trkseg_trkpt_speed, "/gpx/trk/trkseg/trkpt/speed" },
{ tt_trk_trkseg_trkpt_fix, "/gpx/trk/trkseg/trkpt/fix" },
{ tt_trk_trkseg_trkpt_sat, "/gpx/trk/trkseg/trkpt/sat" },
{ tt_trk_trkseg_trkpt_hdop, "/gpx/trk/trkseg/trkpt/hdop" },
{ tt_trk_trkseg_trkpt_vdop, "/gpx/trk/trkseg/trkpt/vdop" },
{ tt_trk_trkseg_trkpt_pdop, "/gpx/trk/trkseg/trkpt/pdop" },
{0}
};
static tag_type get_tag(const char *t)
{
tag_mapping *tm;
for (tm = tag_path_map; tm->tag_type != 0; tm++)
if (0 == strcmp(tm->tag_name, t))
return tm->tag_type;
return tt_unknown;
}
/******************************************/
tag_type current_tag = tt_unknown;
GString *xpath = NULL;
GString *c_cdata = NULL;
/* current ("c_") objects */
VikTrackpoint *c_tp = NULL;
VikWaypoint *c_wp = NULL;
VikTrack *c_tr = NULL;
gchar *c_wp_name = NULL;
gchar *c_tr_name = NULL;
/* temporary things so we don't have to create them lots of times */
const gchar *c_slat, *c_slon;
struct LatLon c_ll;
/* specialty flags / etc */
gboolean f_tr_newseg;
guint unnamed_waypoints = 0;
guint unnamed_tracks = 0;
static const char *get_attr ( const char **attr, const char *key )
{
while ( *attr ) {
if ( strcmp(*attr,key) == 0 )
return *(attr + 1);
attr += 2;
}
return NULL;
}
static gboolean set_c_ll ( const char **attr )
{
if ( (c_slat = get_attr ( attr, "lat" )) && (c_slon = get_attr ( attr, "lon" )) ) {
c_ll.lat = g_ascii_strtod(c_slat, NULL);
c_ll.lon = g_ascii_strtod(c_slon, NULL);
return TRUE;
}
return FALSE;
}
static void gpx_start(VikTrwLayer *vtl, const char *el, const char **attr)
{
static const gchar *tmp;
g_string_append_c ( xpath, '/' );
g_string_append ( xpath, el );
current_tag = get_tag ( xpath->str );
switch ( current_tag ) {
case tt_wpt:
if ( set_c_ll( attr ) ) {
c_wp = vik_waypoint_new ();
if ( ! get_attr ( attr, "hidden" ) )
c_wp->visible = TRUE;
vik_coord_load_from_latlon ( &(c_wp->coord), vik_trw_layer_get_coord_mode ( vtl ), &c_ll );
}
break;
case tt_trk:
c_tr = vik_track_new ();
if ( ! get_attr ( attr, "hidden" ) )
c_tr->visible = TRUE;
break;
case tt_trk_trkseg:
f_tr_newseg = TRUE;
break;
case tt_trk_trkseg_trkpt:
if ( set_c_ll( attr ) ) {
c_tp = vik_trackpoint_new ();
vik_coord_load_from_latlon ( &(c_tp->coord), vik_trw_layer_get_coord_mode ( vtl ), &c_ll );
if ( f_tr_newseg ) {
c_tp->newsegment = TRUE;
f_tr_newseg = FALSE;
}
c_tr->trackpoints = g_list_append ( c_tr->trackpoints, c_tp );
}
break;
case tt_trk_trkseg_trkpt_ele:
case tt_trk_trkseg_trkpt_time:
case tt_wpt_desc:
case tt_wpt_name:
case tt_wpt_ele:
case tt_wpt_link:
case tt_trk_desc:
case tt_trk_name:
g_string_erase ( c_cdata, 0, -1 ); /* clear the cdata buffer */
break;
case tt_waypoint:
c_wp = vik_waypoint_new ();
c_wp->visible = TRUE;
break;
case tt_waypoint_coord:
if ( set_c_ll( attr ) )
vik_coord_load_from_latlon ( &(c_wp->coord), vik_trw_layer_get_coord_mode ( vtl ), &c_ll );
break;
case tt_waypoint_name:
if ( ( tmp = get_attr(attr, "id") ) ) {
if ( c_wp_name )
g_free ( c_wp_name );
c_wp_name = g_strdup ( tmp );
}
g_string_erase ( c_cdata, 0, -1 ); /* clear the cdata buffer for description */
break;
default: break;
}
}
static void gpx_end(VikTrwLayer *vtl, const char *el)
{
static GTimeVal tp_time;
g_string_truncate ( xpath, xpath->len - strlen(el) - 1 );
switch ( current_tag ) {
case tt_waypoint:
case tt_wpt:
if ( ! c_wp_name )
c_wp_name = g_strdup_printf("VIKING_WP%d", unnamed_waypoints++);
vik_trw_layer_filein_add_waypoint ( vtl, c_wp_name, c_wp );
g_free ( c_wp_name );
c_wp = NULL;
c_wp_name = NULL;
break;
case tt_trk:
if ( ! c_tr_name )
c_tr_name = g_strdup_printf("VIKING_TR%d", unnamed_tracks++);
vik_trw_layer_filein_add_track ( vtl, c_tr_name, c_tr );
g_free ( c_tr_name );
c_tr = NULL;
c_tr_name = NULL;
break;
case tt_wpt_name:
if ( c_wp_name )
g_free ( c_wp_name );
c_wp_name = g_strdup ( c_cdata->str );
g_string_erase ( c_cdata, 0, -1 );
break;
case tt_trk_name:
if ( c_tr_name )
g_free ( c_tr_name );
c_tr_name = g_strdup ( c_cdata->str );
g_string_erase ( c_cdata, 0, -1 );
break;
case tt_wpt_ele:
c_wp->altitude = g_ascii_strtod ( c_cdata->str, NULL );
g_string_erase ( c_cdata, 0, -1 );
break;
case tt_trk_trkseg_trkpt_ele:
c_tp->altitude = g_ascii_strtod ( c_cdata->str, NULL );
g_string_erase ( c_cdata, 0, -1 );
break;
case tt_waypoint_name: /* .loc name is really description. */
case tt_wpt_desc:
vik_waypoint_set_comment ( c_wp, c_cdata->str );
g_string_erase ( c_cdata, 0, -1 );
break;
case tt_wpt_link:
vik_waypoint_set_image ( c_wp, c_cdata->str );
g_string_erase ( c_cdata, 0, -1 );
break;
case tt_wpt_sym: {
gchar *tmp_lower = g_utf8_strdown(c_cdata->str, -1); /* for things like <type>Geocache</type> */
vik_waypoint_set_symbol ( c_wp, tmp_lower );
g_free ( tmp_lower );
g_string_erase ( c_cdata, 0, -1 );
break;
}
case tt_trk_desc:
vik_track_set_comment ( c_tr, c_cdata->str );
g_string_erase ( c_cdata, 0, -1 );
break;
case tt_trk_trkseg_trkpt_time:
if ( g_time_val_from_iso8601(c_cdata->str, &tp_time) ) {
c_tp->timestamp = tp_time.tv_sec;
c_tp->has_timestamp = TRUE;
}
g_string_erase ( c_cdata, 0, -1 );
break;
case tt_trk_trkseg_trkpt_course:
c_tp->course = g_ascii_strtod ( c_cdata->str, NULL );
g_string_erase ( c_cdata, 0, -1 );
break;
case tt_trk_trkseg_trkpt_speed:
c_tp->speed = g_ascii_strtod ( c_cdata->str, NULL );
g_string_erase ( c_cdata, 0, -1 );
break;
case tt_trk_trkseg_trkpt_fix:
if (!strcmp("2d", c_cdata->str))
c_tp->fix_mode = VIK_GPS_MODE_2D;
else if (!strcmp("3d", c_cdata->str))
c_tp->fix_mode = VIK_GPS_MODE_3D;
else /* TODO: more fix modes here */
c_tp->fix_mode = VIK_GPS_MODE_NOT_SEEN;
g_string_erase ( c_cdata, 0, -1 );
break;
case tt_trk_trkseg_trkpt_sat:
c_tp->nsats = atoi ( c_cdata->str );
g_string_erase ( c_cdata, 0, -1 );
break;
case tt_trk_trkseg_trkpt_hdop:
c_tp->hdop = g_strtod ( c_cdata->str, NULL );
g_string_erase ( c_cdata, 0, -1 );
break;
case tt_trk_trkseg_trkpt_vdop:
c_tp->vdop = g_strtod ( c_cdata->str, NULL );
g_string_erase ( c_cdata, 0, -1 );
break;
case tt_trk_trkseg_trkpt_pdop:
c_tp->pdop = g_strtod ( c_cdata->str, NULL );
g_string_erase ( c_cdata, 0, -1 );
break;
default: break;
}
current_tag = get_tag ( xpath->str );
}
static void gpx_cdata(void *dta, const XML_Char *s, int len)
{
switch ( current_tag ) {
case tt_wpt_name:
case tt_trk_name:
case tt_wpt_ele:
case tt_trk_trkseg_trkpt_ele:
case tt_wpt_desc:
case tt_wpt_sym:
case tt_wpt_link:
case tt_trk_desc:
case tt_trk_trkseg_trkpt_time:
case tt_trk_trkseg_trkpt_course:
case tt_trk_trkseg_trkpt_speed:
case tt_trk_trkseg_trkpt_fix:
case tt_trk_trkseg_trkpt_sat:
case tt_trk_trkseg_trkpt_hdop:
case tt_trk_trkseg_trkpt_vdop:
case tt_trk_trkseg_trkpt_pdop:
case tt_waypoint_name: /* .loc name is really description. */
g_string_append_len ( c_cdata, s, len );
break;
default: break; /* ignore cdata from other things */
}
}
// make like a "stack" of tag names
// like gpspoint's separated like /gpx/wpt/whatever
void a_gpx_read_file( VikTrwLayer *vtl, FILE *f ) {
XML_Parser parser = XML_ParserCreate(NULL);
int done=0, len;
XML_SetElementHandler(parser, (XML_StartElementHandler) gpx_start, (XML_EndElementHandler) gpx_end);
XML_SetUserData(parser, vtl); /* in the future we could remove all global variables */
XML_SetCharacterDataHandler(parser, (XML_CharacterDataHandler) gpx_cdata);
gchar buf[4096];
g_assert ( f != NULL && vtl != NULL );
xpath = g_string_new ( "" );
c_cdata = g_string_new ( "" );
unnamed_waypoints = 0;
unnamed_tracks = 0;
while (!done) {
len = fread(buf, 1, sizeof(buf)-7, f);
done = feof(f) || !len;
XML_Parse(parser, buf, len, done);
}
XML_ParserFree (parser);
g_string_free ( xpath, TRUE );
g_string_free ( c_cdata, TRUE );
}
/**** entitize from GPSBabel ****/
typedef struct {
const char * text;
const char * entity;
int not_html;
} entity_types;
static
entity_types stdentities[] = {
{ "&", "&", 0 },
{ "'", "'", 1 },
{ "<", "<", 0 },
{ ">", ">", 0 },
{ "\"", """, 0 },
{ NULL, NULL, 0 }
};
void utf8_to_int( const char *cp, int *bytes, int *value )
{
if ( (*cp & 0xe0) == 0xc0 ) {
if ( (*(cp+1) & 0xc0) != 0x80 ) goto dodefault;
*bytes = 2;
*value = ((*cp & 0x1f) << 6) |
(*(cp+1) & 0x3f);
}
else if ( (*cp & 0xf0) == 0xe0 ) {
if ( (*(cp+1) & 0xc0) != 0x80 ) goto dodefault;
if ( (*(cp+2) & 0xc0) != 0x80 ) goto dodefault;
*bytes = 3;
*value = ((*cp & 0x0f) << 12) |
((*(cp+1) & 0x3f) << 6) |
(*(cp+2) & 0x3f);
}
else if ( (*cp & 0xf8) == 0xf0 ) {
if ( (*(cp+1) & 0xc0) != 0x80 ) goto dodefault;
if ( (*(cp+2) & 0xc0) != 0x80 ) goto dodefault;
if ( (*(cp+3) & 0xc0) != 0x80 ) goto dodefault;
*bytes = 4;
*value = ((*cp & 0x07) << 18) |
((*(cp+1) & 0x3f) << 12) |
((*(cp+2) & 0x3f) << 6) |
(*(cp+3) & 0x3f);
}
else if ( (*cp & 0xfc) == 0xf8 ) {
if ( (*(cp+1) & 0xc0) != 0x80 ) goto dodefault;
if ( (*(cp+2) & 0xc0) != 0x80 ) goto dodefault;
if ( (*(cp+3) & 0xc0) != 0x80 ) goto dodefault;
if ( (*(cp+4) & 0xc0) != 0x80 ) goto dodefault;
*bytes = 5;
*value = ((*cp & 0x03) << 24) |
((*(cp+1) & 0x3f) << 18) |
((*(cp+2) & 0x3f) << 12) |
((*(cp+3) & 0x3f) << 6) |
(*(cp+4) & 0x3f);
}
else if ( (*cp & 0xfe) == 0xfc ) {
if ( (*(cp+1) & 0xc0) != 0x80 ) goto dodefault;
if ( (*(cp+2) & 0xc0) != 0x80 ) goto dodefault;
if ( (*(cp+3) & 0xc0) != 0x80 ) goto dodefault;
if ( (*(cp+4) & 0xc0) != 0x80 ) goto dodefault;
if ( (*(cp+5) & 0xc0) != 0x80 ) goto dodefault;
*bytes = 6;
*value = ((*cp & 0x01) << 30) |
((*(cp+1) & 0x3f) << 24) |
((*(cp+2) & 0x3f) << 18) |
((*(cp+3) & 0x3f) << 12) |
((*(cp+4) & 0x3f) << 6) |
(*(cp+5) & 0x3f);
}
else {
dodefault:
*bytes = 1;
*value = (unsigned char)*cp;
}
}
static
char *
entitize(const char * str)
{
int elen, ecount, nsecount;
entity_types *ep;
const char * cp;
char * p, * tmp, * xstr;
char tmpsub[20];
int bytes = 0;
int value = 0;
ep = stdentities;
elen = ecount = nsecount = 0;
/* figure # of entity replacements and additional size. */
while (ep->text) {
cp = str;
while ((cp = strstr(cp, ep->text)) != NULL) {
elen += strlen(ep->entity) - strlen(ep->text);
ecount++;
cp += strlen(ep->text);
}
ep++;
}
/* figure the same for other than standard entities (i.e. anything
* that isn't in the range U+0000 to U+007F */
for ( cp = str; *cp; cp++ ) {
if ( *cp & 0x80 ) {
utf8_to_int( cp, &bytes, &value );
cp += bytes-1;
elen += sprintf( tmpsub, "&#x%x;", value ) - bytes;
nsecount++;
}
}
/* enough space for the whole string plus entity replacements, if any */
tmp = g_malloc((strlen(str) + elen + 1));
strcpy(tmp, str);
/* no entity replacements */
if (ecount == 0 && nsecount == 0)
return (tmp);
if ( ecount != 0 ) {
for (ep = stdentities; ep->text; ep++) {
p = tmp;
while ((p = strstr(p, ep->text)) != NULL) {
elen = strlen(ep->entity);
xstr = g_strdup(p + strlen(ep->text));
strcpy(p, ep->entity);
strcpy(p + elen, xstr);
g_free(xstr);
p += elen;
}
}
}
if ( nsecount != 0 ) {
p = tmp;
while (*p) {
if ( *p & 0x80 ) {
utf8_to_int( p, &bytes, &value );
if ( p[bytes] ) {
xstr = g_strdup( p + bytes );
}
else {
xstr = NULL;
}
sprintf( p, "&#x%x;", value );
p = p+strlen(p);
if ( xstr ) {
strcpy( p, xstr );
g_free(xstr);
}
}
else {
p++;
}
}
}
return (tmp);
}
/**** end GPSBabel code ****/
/* export GPX */
static void gpx_write_waypoint ( const gchar *name, VikWaypoint *wp, GpxWritingContext *context )
{
FILE *f = context->file;
static struct LatLon ll;
gchar *s_lat,*s_lon;
gchar *tmp;
vik_coord_to_latlon ( &(wp->coord), &ll );
s_lat = a_coords_dtostr( ll.lat );
s_lon = a_coords_dtostr( ll.lon );
fprintf ( f, "<wpt lat=\"%s\" lon=\"%s\"%s>\n",
s_lat, s_lon, wp->visible ? "" : " hidden=\"hidden\"" );
g_free ( s_lat );
g_free ( s_lon );
tmp = entitize ( name );
fprintf ( f, " <name>%s</name>\n", tmp );
g_free ( tmp);
if ( wp->altitude != VIK_DEFAULT_ALTITUDE )
{
tmp = a_coords_dtostr ( wp->altitude );
fprintf ( f, " <ele>%s</ele>\n", tmp );
g_free ( tmp );
}
if ( wp->comment )
{
tmp = entitize(wp->comment);
fprintf ( f, " <desc>%s</desc>\n", tmp );
g_free ( tmp );
}
if ( wp->image )
{
tmp = entitize(wp->image);
fprintf ( f, " <link>%s</link>\n", tmp );
g_free ( tmp );
}
if ( wp->symbol )
{
tmp = entitize(wp->symbol);
fprintf ( f, " <sym>%s</sym>\n", tmp);
g_free ( tmp );
}
fprintf ( f, "</wpt>\n" );
}
static void gpx_write_trackpoint ( VikTrackpoint *tp, GpxWritingContext *context )
{
FILE *f = context->file;
static struct LatLon ll;
gchar *s_lat,*s_lon, *s_alt, *s_dop;
gchar *time_iso8601;
vik_coord_to_latlon ( &(tp->coord), &ll );
if ( tp->newsegment )
fprintf ( f, " </trkseg>\n <trkseg>\n" );
s_lat = a_coords_dtostr( ll.lat );
s_lon = a_coords_dtostr( ll.lon );
fprintf ( f, " <trkpt lat=\"%s\" lon=\"%s\">\n", s_lat, s_lon );
g_free ( s_lat ); s_lat = NULL;
g_free ( s_lon ); s_lon = NULL;
s_alt = NULL;
if ( tp->altitude != VIK_DEFAULT_ALTITUDE )
{
s_alt = a_coords_dtostr ( tp->altitude );
}
else if ( context->options != NULL && context->options->force_ele )
{
s_alt = a_coords_dtostr ( 0 );
}
if (s_alt != NULL)
fprintf ( f, " <ele>%s</ele>\n", s_alt );
g_free ( s_alt ); s_alt = NULL;
time_iso8601 = NULL;
if ( tp->has_timestamp ) {
GTimeVal timestamp;
timestamp.tv_sec = tp->timestamp;
timestamp.tv_usec = 0;
time_iso8601 = g_time_val_to_iso8601 ( ×tamp );
}
else if ( context->options != NULL && context->options->force_time )
{
GTimeVal current;
g_get_current_time ( ¤t );
time_iso8601 = g_time_val_to_iso8601 ( ¤t );
}
if ( time_iso8601 != NULL )
fprintf ( f, " <time>%s</time>\n", time_iso8601 );
g_free(time_iso8601);
time_iso8601 = NULL;
if (!isnan(tp->course)) {
gchar *s_course = a_coords_dtostr(tp->course);
fprintf ( f, " <course>%s</course>\n", s_course );
g_free(s_course);
}
if (!isnan(tp->speed)) {
gchar *s_speed = a_coords_dtostr(tp->speed);
fprintf ( f, " <speed>%s</speed>\n", s_speed );
g_free(s_speed);
}
if (tp->fix_mode == VIK_GPS_MODE_2D)
fprintf ( f, " <fix>2d</fix>\n");
if (tp->fix_mode == VIK_GPS_MODE_3D)
fprintf ( f, " <fix>3d</fix>\n");
if (tp->nsats > 0)
fprintf ( f, " <sat>%d</sat>\n", tp->nsats );
s_dop = NULL;
if ( tp->hdop != VIK_DEFAULT_DOP )
{
s_dop = a_coords_dtostr ( tp->hdop );
}
if (s_dop != NULL)
fprintf ( f, " <hdop>%s</hdop>\n", s_dop );
g_free ( s_dop ); s_dop = NULL;
if ( tp->vdop != VIK_DEFAULT_DOP )
{
s_dop = a_coords_dtostr ( tp->vdop );
}
if (s_dop != NULL)
fprintf ( f, " <vdop>%s</vdop>\n", s_dop );
g_free ( s_dop ); s_dop = NULL;
if ( tp->pdop != VIK_DEFAULT_DOP )
{
s_dop = a_coords_dtostr ( tp->pdop );
}
if (s_dop != NULL)
fprintf ( f, " <pdop>%s</pdop>\n", s_dop );
g_free ( s_dop ); s_dop = NULL;
fprintf ( f, " </trkpt>\n" );
}
static void gpx_write_track ( const gchar *name, VikTrack *t, GpxWritingContext *context )
{
FILE *f = context->file;
gchar *tmp;
gboolean first_tp_is_newsegment = FALSE; /* must temporarily make it not so, but we want to restore state. not that it matters. */
tmp = entitize ( name );
fprintf ( f, "<trk%s>\n <name>%s</name>\n", t->visible ? "" : " hidden=\"hidden\"", tmp );
g_free ( tmp );
if ( t->comment )
{
tmp = entitize ( t->comment );
fprintf ( f, " <desc>%s</desc>\n", tmp );
g_free ( tmp );
}
fprintf ( f, " <trkseg>\n" );
if ( t->trackpoints && t->trackpoints->data ) {
first_tp_is_newsegment = VIK_TRACKPOINT(t->trackpoints->data)->newsegment;
VIK_TRACKPOINT(t->trackpoints->data)->newsegment = FALSE; /* so we won't write </trkseg><trkseg> already */
g_list_foreach ( t->trackpoints, (GFunc) gpx_write_trackpoint, context );
VIK_TRACKPOINT(t->trackpoints->data)->newsegment = first_tp_is_newsegment; /* restore state */
}
fprintf ( f, "</trkseg>\n</trk>\n" );
}
static void gpx_write_header( FILE *f )
{
fprintf(f, "<?xml version=\"1.0\"?>\n"
"<gpx version=\"1.0\" creator=\"Viking -- http://viking.sf.net/\"\n"
"xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n"
"xmlns=\"http://www.topografix.com/GPX/1/0\"\n"
"xsi:schemaLocation=\"http://www.topografix.com/GPX/1/0 http://www.topografix.com/GPX/1/0/gpx.xsd\">\n");
}
static void gpx_write_footer( FILE *f )
{
fprintf(f, "</gpx>\n");
}
typedef struct {
VikWaypoint *wp;
const gchar *name;
} gpx_waypoint_and_name;
typedef struct {
gpx_waypoint_and_name *wps;
guint i;
guint n_wps;
} gpx_gather_waypoints_passalong_t;
/* Type to hold name of track and timestamp of first trackpoint */
typedef struct {
time_t first_timestamp;
const gchar *name;
} gpx_track_and_timestamp;
typedef struct {
gpx_track_and_timestamp *trks;
guint i;
guint n_trks;
} gpx_gather_tracks_passalong_t;
static void gpx_collect_waypoint ( const gchar *name, VikWaypoint *wp, gpx_gather_waypoints_passalong_t *passalong )
{
if ( passalong->i < passalong->n_wps ) {
passalong->wps[passalong->i].name = name;
passalong->wps[passalong->i].wp = wp;
passalong->i++;
}
}
/* Function to collect a track and the first timestamp in the list */
static void gpx_collect_track (const gchar *name, VikTrack *track, gpx_gather_tracks_passalong_t *passalong)
{
if (passalong->i < passalong->n_trks)
{
passalong->trks[passalong->i].name = name;
if (track && track->trackpoints && track->trackpoints->data)
{
VikTrackpoint *first_point = (VikTrackpoint *)track->trackpoints->data;
passalong->trks[passalong->i].first_timestamp = first_point->timestamp;
}
else
{
passalong->trks[passalong->i].first_timestamp = 0;
}
passalong->i++;
}
}
static int gpx_waypoint_and_name_compar(const void *x, const void *y)
{
gpx_waypoint_and_name *a = (gpx_waypoint_and_name *)x;
gpx_waypoint_and_name *b = (gpx_waypoint_and_name *)y;
return strcmp(a->name,b->name);
}
/* Function to compare two tracks by their first timestamp */
static int gpx_track_and_timestamp_compar(const void *x, const void *y)
{
gpx_track_and_timestamp *a = (gpx_track_and_timestamp *)x;
gpx_track_and_timestamp *b = (gpx_track_and_timestamp *)y;
if (a->first_timestamp < b->first_timestamp)
{
return -1;
}
if (a->first_timestamp > b->first_timestamp)
{
return 1;
}
return 0;
}
void a_gpx_write_file( VikTrwLayer *vtl, FILE *f )
{
a_gpx_write_file_options(NULL, vtl, f);
}
void a_gpx_write_file_options ( GpxWritingOptions *options, VikTrwLayer *vtl, FILE *f )
{
GpxWritingContext context = { options, f };
int i;
gpx_write_header ( f );
gpx_gather_waypoints_passalong_t passalong;
passalong.n_wps = g_hash_table_size ( vik_trw_layer_get_waypoints ( vtl ) );
passalong.i = 0;
passalong.wps = g_new(gpx_waypoint_and_name,passalong.n_wps);
g_hash_table_foreach ( vik_trw_layer_get_waypoints ( vtl ), (GHFunc) gpx_collect_waypoint, &passalong );
/* gather waypoints in a list, then sort */
qsort(passalong.wps, passalong.n_wps, sizeof(gpx_waypoint_and_name), gpx_waypoint_and_name_compar);
for ( i = 0; i < passalong.n_wps; i++ )
gpx_write_waypoint ( passalong.wps[i].name, passalong.wps[i].wp, &context);
g_free ( passalong.wps );
gpx_gather_tracks_passalong_t passalong_tracks;
passalong_tracks.n_trks = g_hash_table_size ( vik_trw_layer_get_tracks (vtl) );
passalong_tracks.i = 0;
passalong_tracks.trks = g_new(gpx_track_and_timestamp,passalong_tracks.n_trks);
g_hash_table_foreach (vik_trw_layer_get_tracks(vtl), (GHFunc) gpx_collect_track, &passalong_tracks);
/* Sort by timestamp */
qsort(passalong_tracks.trks, passalong_tracks.n_trks, sizeof(gpx_track_and_timestamp), gpx_track_and_timestamp_compar);
for (i=0;i<passalong_tracks.n_trks; i++)
{
gpx_write_track(passalong_tracks.trks[i].name, (VikTrack *)g_hash_table_lookup(vik_trw_layer_get_tracks(vtl), passalong_tracks.trks[i].name), &context);
}
g_free ( passalong_tracks.trks );
gpx_write_footer ( f );
}
void a_gpx_write_track_file ( const gchar *name, VikTrack *t, FILE *f )
{
a_gpx_write_track_file_options ( NULL, name, t, f );
}
void a_gpx_write_track_file_options ( GpxWritingOptions *options, const gchar *name, VikTrack *t, FILE *f )
{
GpxWritingContext context = {options, f};
gpx_write_header ( f );
gpx_write_track ( name, t, &context );
gpx_write_footer ( f );
}