err.no Git - mapper/blob - src/gpx.c

   1 /*
   2  * This file is part of mapper
   3  *
   4  * Copyright (C) 2006-2007 John Costigan.
   5  *
   6  * POI and GPS-Info code originally written by Cezary Jackiewicz.
   7  *
   8  * Default map data provided by http://www.openstreetmap.org/
   9  *
  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.
  14  *
  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.
  19  *
  20  * You should have received a copy of the GNU General Public License along
  21  * with this program; if not, write to the Free Software Foundation, Inc.,
  22  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  23  */
  24
  25 #include <config.h>
  26 #include <unistd.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <strings.h>
  30 #include <stddef.h>
  31 #include <locale.h>
  32 #include <math.h>
  33 #include <errno.h>
  34 #include <sys/wait.h>
  35 #include <glib/gstdio.h>
  36 #include <glib/gi18n.h>
  37 #include <gtk/gtk.h>
  38 #include <fcntl.h>
  39 #include <libgnomevfs/gnome-vfs.h>
  40 #include <curl/multi.h>
  41 #include <gconf/gconf-client.h>
  42 #include <libxml/parser.h>
  43
  44 #include <libintl.h>
  45 #include <locale.h>
  46
  47 #include <sqlite3.h>
  48
  49 #include "ui-common.h"
  50 #include "path.h"
  51 #include "utils.h"
  52 #include "gps.h"
  53 #include "mapper-types.h"
  54 #include "latlon.h"
  55 #include "map.h"
  56 #include "gpx.h"
  57 #include "dialogs.h"
  58
  59 #define XML_DATE_FORMAT "%FT%T"
  60
  61 #define WRITE_STRING(string) { \
  62     GnomeVFSResult vfs_result; \
  63     GnomeVFSFileSize size; \
  64     if(GNOME_VFS_OK != (vfs_result = gnome_vfs_write(handle, (string), strlen((string)), &size))) \
  65     { \
  66         gchar buffer[BUFFER_SIZE]; \
  67         g_snprintf(buffer, sizeof(buffer), \
  68                 "%s:\n%s\n%s", _("Error while writing to file"), _("File is incomplete."), \
  69                 gnome_vfs_result_to_string(vfs_result)); \
  70         popup_error(_window, buffer); \
  71         return FALSE; \
  72     } \
  73 }
  74
  75 /** This enum defines the states of the SAX parsing state machine. */
  76 typedef enum {
  77         START,
  78         INSIDE_GPX,
  79         INSIDE_PATH,
  80         INSIDE_PATH_SEGMENT,
  81         INSIDE_PATH_POINT,
  82         INSIDE_PATH_POINT_ELE,
  83         INSIDE_PATH_POINT_TIME,
  84         INSIDE_PATH_POINT_DESC,
  85         INSIDE_PATH_POINT_NAME,
  86         FINISH,
  87         UNKNOWN,
  88         ERROR,
  89 } SaxState;
  90
  91 /** Data used during the SAX parsing operation. */
  92 typedef struct _SaxData SaxData;
  93 struct _SaxData {
  94         Path path;
  95         SaxState state;
  96         SaxState prev_state;
  97         guint unknown_depth;
  98         gboolean at_least_one_trkpt;
  99         GString *chars;
 100 };
 101
 102 gchar XML_TZONE[7];
 103
 104 void
 105 gpx_init(void)
 106 {
 107 time_t time1;
 108 struct tm time2;
 109 time1 = time(NULL);
 110 localtime_r(&time1, &time2);
 111 g_snprintf(XML_TZONE, sizeof(XML_TZONE), "%+03ld:%02ld",
 112          (time2.tm_gmtoff / 60 / 60), (time2.tm_gmtoff / 60) % 60);
 113 }
 114
 115 gboolean
 116 write_gpx(Path * path, GnomeVFSHandle * handle)
 117 {
 118         Point *curr = NULL;
 119         WayPoint *wcurr = NULL;
 120         gboolean trkseg_break = FALSE;
 121
 122         /* Find first non-zero point. */
 123         for (curr = path->head - 1, wcurr = path->whead; curr++ != path->tail;) {
 124                 if (curr->unity)
 125                         break;
 126                 else if (wcurr && curr == wcurr->point)
 127                         wcurr++;
 128         }
 129
 130         /* Write the header. */
 131         WRITE_STRING("<?xml version=\"1.0\"?>\n"
 132                      "<gpx version=\"1.0\" creator=\"mapper\" "
 133                      "xmlns=\"http://www.topografix.com/GPX/1/0\">\n"
 134                      "  <trk>\n" "    <trkseg>\n");
 135
 136         /* Curr points to first non-zero point. */
 137         for (curr--; curr++ != path->tail;) {
 138                 gdouble lat, lon;
 139                 if (curr->unity) {
 140                         gchar buffer[80];
 141                         gboolean first_sub = TRUE;
 142                         if (trkseg_break) {
 143                                 /* First trkpt of the segment - write trkseg header. */
 144                                 WRITE_STRING("    </trkseg>\n"
 145                                              "    <trkseg>\n");
 146                                 trkseg_break = FALSE;
 147                         }
 148                         unit2latlon(curr->unitx, curr->unity, lat, lon);
 149                         WRITE_STRING("      <trkpt lat=\"");
 150                         g_ascii_formatd(buffer, sizeof(buffer), "%.06f", lat);
 151                         WRITE_STRING(buffer);
 152                         WRITE_STRING("\" lon=\"");
 153                         g_ascii_formatd(buffer, sizeof(buffer), "%.06f", lon);
 154                         WRITE_STRING(buffer);
 155                         WRITE_STRING("\"");
 156
 157                         /* write the elevation */
 158                         if (!isnan(curr->altitude)) {
 159                                 if (first_sub) {
 160                                         WRITE_STRING(">\n");
 161                                         first_sub = FALSE;
 162                                 }
 163                                 WRITE_STRING("        <ele>");
 164                                 {
 165                                         g_ascii_formatd(buffer, 80, "%.2f",
 166                                                         curr->altitude);
 167                                         WRITE_STRING(buffer);
 168                                 }
 169                                 WRITE_STRING("</ele>\n");
 170                         }
 171
 172                         /* write the time */
 173                         if (curr->time) {
 174                                 if (first_sub) {
 175                                         WRITE_STRING(">\n");
 176                                         first_sub = FALSE;
 177                                 }
 178                                 WRITE_STRING("        <time>");
 179                                 strftime(buffer, 80, XML_DATE_FORMAT,
 180                                          localtime(&curr->time));
 181                                 WRITE_STRING(buffer);
 182                                 WRITE_STRING(XML_TZONE);
 183                                 WRITE_STRING("</time>\n");
 184                         }
 185
 186                         if (wcurr && curr == wcurr->point) {
 187                                 if (first_sub) {
 188                                         WRITE_STRING(">\n");
 189                                         first_sub = FALSE;
 190                                 }
 191                                 WRITE_STRING("        <desc>");
 192                                 WRITE_STRING(wcurr->desc);
 193                                 WRITE_STRING("</desc>\n");
 194                                 wcurr++;
 195                         }
 196                         if (first_sub) {
 197                                 WRITE_STRING("/>\n");
 198                         } else {
 199                                 WRITE_STRING("      </trkpt>\n");
 200                         }
 201                 } else
 202                         trkseg_break = TRUE;
 203         }
 204
 205         /* Write the footer. */
 206         WRITE_STRING("    </trkseg>\n" "  </trk>\n" "</gpx>\n");
 207
 208         return TRUE;
 209 }
 210
 211 /**
 212  * Handle a start tag in the parsing of a GPX file.
 213  */
 214 #define MACRO_SET_UNKNOWN() { \
 215     data->prev_state = data->state; \
 216     data->state = UNKNOWN; \
 217     data->unknown_depth = 1; \
 218         g_debug("GPX: unknown tag"); }
 219
 220 static void
 221 gpx_start_element(SaxData * data, const xmlChar * name, const xmlChar ** attrs)
 222 {
 223         g_debug("GPX-START: %s", name);
 224         switch (data->state) {
 225         case ERROR:
 226                 break;
 227         case START:
 228                 if (!strcmp((gchar *) name, "gpx"))
 229                         data->state = INSIDE_GPX;
 230                 else
 231                         MACRO_SET_UNKNOWN();
 232                 break;
 233         case INSIDE_GPX:
 234                 if (!strcmp((gchar *) name, "trk"))
 235                         data->state = INSIDE_PATH;
 236                 else
 237                         MACRO_SET_UNKNOWN();
 238                 break;
 239         case INSIDE_PATH:
 240                 if (!strcmp((gchar *) name, "trkseg")) {
 241                         data->state = INSIDE_PATH_SEGMENT;
 242                         data->at_least_one_trkpt = FALSE;
 243                 } else
 244                         MACRO_SET_UNKNOWN();
 245                 break;
 246         case INSIDE_PATH_SEGMENT:
 247                 if (!strcmp((gchar *) name, "trkpt")) {
 248                         const xmlChar **curr_attr;
 249                         gchar *error_check;
 250                         gdouble lat = 0.f, lon = 0.f;
 251                         gboolean has_lat, has_lon;
 252                         has_lat = FALSE;
 253                         has_lon = FALSE;
 254                         for (curr_attr = attrs; *curr_attr != NULL;) {
 255                                 const gchar *attr_name = *curr_attr++;
 256                                 const gchar *attr_val = *curr_attr++;
 257                                 if (!strcmp(attr_name, "lat")) {
 258                                         lat = g_ascii_strtod(attr_val, &error_check);
 259                                         if (error_check != attr_val)
 260                                                 has_lat = TRUE;
 261                                 } else if (!strcmp(attr_name, "lon")) {
 262                                         lon = g_ascii_strtod(attr_val, &error_check);
 263                                         if (error_check != attr_val)
 264                                                 has_lon = TRUE;
 265                                 }
 266                         }
 267                         if (has_lat && has_lon) {
 268                                 MACRO_PATH_INCREMENT_TAIL(data->path);
 269                                 latlon2unit(lat, lon, data->path.tail->unitx, data->path.tail->unity);
 270                                 data->path.tail->time = 0;
 271                                 data->path.tail->altitude = NAN;
 272                                 data->state = INSIDE_PATH_POINT;
 273                         } else
 274                                 data->state = ERROR;
 275                 } else
 276                         MACRO_SET_UNKNOWN();
 277                 break;
 278         case INSIDE_PATH_POINT:
 279                 if (!strcmp((gchar *) name, "time"))
 280                         data->state = INSIDE_PATH_POINT_TIME;
 281                 else if (!strcmp((gchar *) name, "ele"))
 282                         data->state = INSIDE_PATH_POINT_ELE;
 283                 else if (!strcmp((gchar *) name, "desc"))
 284                         data->state = INSIDE_PATH_POINT_DESC;
 285                 else if (!strcmp((gchar *) name, "name"))
 286                         data->state = INSIDE_PATH_POINT_NAME;
 287                 else
 288                         MACRO_SET_UNKNOWN();
 289                 break;
 290         case UNKNOWN:
 291                 data->unknown_depth++;
 292                 break;
 293         default:
 294                 ;
 295         }
 296
 297 }
 298
 299 /**
 300  * Handle an end tag in the parsing of a GPX file.
 301  */
 302 static void
 303 gpx_end_element(SaxData * data, const xmlChar * name)
 304 {
 305         g_debug("GPX-END: %s", name);
 306
 307         switch (data->state) {
 308         case ERROR:
 309
 310         break;
 311         case START:
 312                 data->state = ERROR;
 313         break;
 314         case INSIDE_GPX:
 315                 if (!strcmp((gchar *) name, "gpx"))
 316                         data->state = FINISH;
 317                 else
 318                         data->state = ERROR;
 319         break;
 320         case INSIDE_PATH:
 321                 if (!strcmp((gchar *) name, "trk"))
 322                         data->state = INSIDE_GPX;
 323                 else
 324                         data->state = ERROR;
 325         break;
 326         case INSIDE_PATH_SEGMENT:
 327                 if (!strcmp((gchar *) name, "trkseg")) {
 328                         if (data->at_least_one_trkpt) {
 329                                 MACRO_PATH_INCREMENT_TAIL(data->path);
 330                                 *data->path.tail = _point_null;
 331                         }
 332                         data->state = INSIDE_PATH;
 333                 } else
 334                         data->state = ERROR;
 335         break;
 336         case INSIDE_PATH_POINT:
 337                 if (!strcmp((gchar *) name, "trkpt")) {
 338                         data->state = INSIDE_PATH_SEGMENT;
 339                         data->at_least_one_trkpt = TRUE;
 340                 } else
 341                         data->state = ERROR;
 342         break;
 343         case INSIDE_PATH_POINT_ELE:
 344                 if (!strcmp((gchar *) name, "ele")) {
 345                         gchar *error_check;
 346                         data->path.tail->altitude = g_ascii_strtod(data->chars->str, &error_check);
 347                         if (error_check == data->chars->str)
 348                                 data->path.tail->altitude = NAN;
 349                         data->state = INSIDE_PATH_POINT;
 350                         g_string_free(data->chars, TRUE);
 351                         data->chars = g_string_new("");
 352                 } else
 353                         data->state = ERROR;
 354         break;
 355         case INSIDE_PATH_POINT_TIME:
 356                 if (!strcmp((gchar *) name, "time")) {
 357                         struct tm time;
 358                         gchar *ptr;
 359
 360                         if (NULL == (ptr = strptime(data->chars->str, XML_DATE_FORMAT, &time)))
 361                                 /* Failed to parse dateTime format. */
 362                                 data->state = ERROR;
 363                         else {
 364                                 /* Parse was successful. Now we have to parse timezone.
 365                                  * From here on, if there is an error, I just assume local
 366                                  * timezone.  Yes, this is not proper XML, but I don't
 367                                  * care. */
 368                                 gchar *error_check;
 369
 370                                 /* First, set time in "local" time zone. */
 371                                 data->path.tail->time = (mktime(&time));
 372
 373                                 /* Now, skip inconsequential characters */
 374                                 while (*ptr && *ptr != 'Z' && *ptr != '-' && *ptr != '+')
 375                                         ptr++;
 376
 377                                 /* Check if we ran to the end of the string. */
 378                                 if (*ptr) {
 379                                         /* Next character is either 'Z', '-', or '+' */
 380                                         if (*ptr == 'Z')
 381                                                 /* Zulu (UTC) time. Undo the local time zone's offset. */
 382                                                 data->path.tail->time += time.tm_gmtoff;
 383                                         else {
 384                                                 /* Not Zulu (UTC). Must parse hours and minutes. */
 385                                                 gint offhours = strtol(ptr, &error_check, 10);
 386                                                 if (error_check != ptr && *(ptr = error_check) == ':') {
 387                                                         /* Parse of hours worked. Check minutes. */
 388                                                         gint offmins = strtol(ptr + 1, &error_check, 10);
 389                                                         if (error_check != (ptr + 1)) {
 390                                                                 /* Parse of minutes worked. Calculate. */
 391                                                                 data->path.tail->time += (time.tm_gmtoff - (offhours * 60 * 60 + offmins * 60));
 392                                                         }
 393                                                 }
 394                                         }
 395                                 }
 396                                 /* Successfully parsed dateTime. */
 397                                 data->state = INSIDE_PATH_POINT;
 398                         }
 399
 400                         g_string_free(data->chars, TRUE);
 401                         data->chars = g_string_new("");
 402                 } else
 403                         data->state = ERROR;
 404         break;
 405         case INSIDE_PATH_POINT_DESC:
 406                 /* only parse description for routes */
 407                 if (!strcmp((gchar *) name, "desc")) {
 408                         MACRO_PATH_INCREMENT_WTAIL(data->path);
 409                         data->path.wtail->point = data->path.tail;
 410                         data->path.wtail->desc = g_string_free(data->chars, FALSE);
 411                         data->chars = g_string_new("");
 412                         data->state = INSIDE_PATH_POINT;
 413                 } else
 414                         data->state = ERROR;
 415         break;
 416         case INSIDE_PATH_POINT_NAME:
 417
 418         break;
 419         case UNKNOWN:
 420                 if (!--data->unknown_depth)
 421                         data->state = data->prev_state;
 422                 else
 423                         data->state = ERROR;
 424         break;
 425         default:
 426                 ;
 427         }
 428
 429 }
 430
 431 /**
 432  * Handle char data in the parsing of a GPX file.
 433  */
 434 static void
 435 gpx_chars(SaxData * data, const xmlChar * ch, int len)
 436 {
 437         guint i;
 438
 439         switch (data->state) {
 440         case ERROR:
 441         case UNKNOWN:
 442                 break;
 443         case INSIDE_PATH_POINT_ELE:
 444         case INSIDE_PATH_POINT_TIME:
 445         case INSIDE_PATH_POINT_DESC:
 446         case INSIDE_PATH_POINT_NAME:
 447                 for (i = 0; i < len; i++)
 448                         data->chars = g_string_append_c(data->chars, ch[i]);
 449                 g_debug("GPXC: %s", data->chars->str);
 450                 break;
 451         default:
 452                 break;
 453         }
 454
 455 }
 456
 457 /**
 458  * Handle an entity in the parsing of a GPX file.  We don't do anything
 459  * special here.
 460  */
 461 static xmlEntityPtr
 462 gpx_get_entity(SaxData * data, const xmlChar * name)
 463 {
 464         return xmlGetPredefinedEntity(name);
 465 }
 466
 467 /**
 468  * Handle an error in the parsing of a GPX file.
 469  */
 470 static void
 471 gpx_error(SaxData * data, const gchar * msg, ...)
 472 {
 473         data->state = ERROR;
 474 }
 475
 476 gboolean
 477 parse_gpx(Path * to_replace, gchar * buffer, gint size, gint policy_old)
 478 {
 479         SaxData data;
 480         xmlSAXHandler sax_handler;
 481
 482         MACRO_PATH_INIT(data.path);
 483         data.state = START;
 484         data.chars = g_string_new("");
 485
 486         memset(&sax_handler, 0, sizeof(sax_handler));
 487         sax_handler.characters = (charactersSAXFunc) gpx_chars;
 488         sax_handler.startElement = (startElementSAXFunc) gpx_start_element;
 489         sax_handler.endElement = (endElementSAXFunc) gpx_end_element;
 490         sax_handler.entityDecl = (entityDeclSAXFunc) gpx_get_entity;
 491         sax_handler.warning = (warningSAXFunc) gpx_error;
 492         sax_handler.error = (errorSAXFunc) gpx_error;
 493         sax_handler.fatalError = (fatalErrorSAXFunc) gpx_error;
 494
 495         xmlSAXUserParseMemory(&sax_handler, &data, buffer, size);
 496         g_string_free(data.chars, TRUE);
 497
 498         if (data.state != FINISH) {
 499                 return FALSE;
 500         }
 501
 502         if (policy_old && to_replace->head != to_replace->tail) {
 503                 Point *src_first;
 504                 Path *src, *dest;
 505
 506                 if (policy_old > 0) {
 507                         /* Append to current path. Make sure last path point is zero. */
 508                         if (to_replace->tail->unity != 0) {
 509                                 MACRO_PATH_INCREMENT_TAIL((*to_replace));
 510                                 *to_replace->tail = _point_null;
 511                         }
 512                         src = &data.path;
 513                         dest = to_replace;
 514                 } else {
 515                         /* Prepend to current route. */
 516                         src = to_replace;
 517                         dest = &data.path;
 518                 }
 519
 520                 /* Find src_first non-zero point. */
 521                 for (src_first = src->head - 1; src_first++ != src->tail;)
 522                         if (src_first->unity)
 523                                 break;
 524
 525                 /* Append route points from src to dest. */
 526                 if (src->tail >= src_first) {
 527                         WayPoint *curr;
 528                         guint num_dest_points = dest->tail - dest->head + 1;
 529                         guint num_src_points = src->tail - src_first + 1;
 530
 531                         /* Adjust dest->tail to be able to fit src route data
 532                          * plus room for more route data. */
 533                         path_resize(dest, num_dest_points + num_src_points);
 534
 535                         memcpy(dest->tail + 1, src_first, num_src_points * sizeof(Point));
 536
 537                         dest->tail += num_src_points;
 538
 539                         /* Append waypoints from src to dest->. */
 540                         path_wresize(dest, (dest->wtail - dest->whead) + (src->wtail - src->whead) + 2);
 541                         for (curr = src->whead - 1; curr++ != src->wtail;) {
 542                                 (++(dest->wtail))->point = dest->head + num_dest_points + (curr->point - src_first);
 543                                 dest->wtail->desc = curr->desc;
 544                         }
 545
 546                 }
 547
 548                 /* Kill old route - don't use MACRO_PATH_FREE(), because that
 549                  * would free the string desc's that we just moved to data.route. */
 550                 g_free(src->head);
 551                 g_free(src->whead);
 552                 if (policy_old < 0)
 553                         (*to_replace) = *dest;
 554         } else {
 555                 MACRO_PATH_FREE((*to_replace));
 556                 /* Overwrite with data.route. */
 557                 (*to_replace) = data.path;
 558                 path_resize(to_replace,
 559                             to_replace->tail - to_replace->head + 1);
 560                 path_wresize(to_replace,
 561                              to_replace->wtail - to_replace->whead + 1);
 562         }
 563
 564         return TRUE;
 565 }