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 #define _GNU_SOURCE
  26
  27 #include <config.h>
  28 #include <unistd.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <strings.h>
  32 #include <stddef.h>
  33 #include <locale.h>
  34 #include <math.h>
  35 #include <errno.h>
  36 #include <sys/wait.h>
  37 #include <glib/gstdio.h>
  38 #include <glib/gi18n.h>
  39 #include <gtk/gtk.h>
  40 #include <fcntl.h>
  41 #include <libgnomevfs/gnome-vfs.h>
  42 #include <curl/multi.h>
  43 #include <gconf/gconf-client.h>
  44 #include <libxml/parser.h>
  45
  46 #include <libintl.h>
  47 #include <locale.h>
  48
  49 #include <sqlite3.h>
  50
  51 #include "ui-common.h"
  52 #include "path.h"
  53 #include "utils.h"
  54 #include "gps.h"
  55 #include "mapper-types.h"
  56 #include "latlon.h"
  57 #include "gpx.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( \
  65                     handle, (string), strlen((string)), &size))) \
  66     { \
  67         gchar buffer[BUFFER_SIZE]; \
  68         snprintf(buffer, sizeof(buffer), \
  69                 "%s:\n%s\n%s", _("Error while writing to file"), \
  70                 _("File is incomplete."), \
  71                 gnome_vfs_result_to_string(vfs_result)); \
  72         popup_error(_window, buffer); \
  73         return FALSE; \
  74     } \
  75 }
  76
  77 /** This enum defines the states of the SAX parsing state machine. */
  78 typedef enum {
  79         START,
  80         INSIDE_GPX,
  81         INSIDE_PATH,
  82         INSIDE_PATH_SEGMENT,
  83         INSIDE_PATH_POINT,
  84         INSIDE_PATH_POINT_ELE,
  85         INSIDE_PATH_POINT_TIME,
  86         INSIDE_PATH_POINT_DESC,
  87         FINISH,
  88         UNKNOWN,
  89         ERROR,
  90 } SaxState;
  91
  92 /** Data used during the SAX parsing operation. */
  93 typedef struct _SaxData SaxData;
  94 struct _SaxData {
  95         Path path;
  96         SaxState state;
  97         SaxState prev_state;
  98         guint unknown_depth;
  99         gboolean at_least_one_trkpt;
 100         GString *chars;
 101 };
 102
 103 gchar XML_TZONE[7];
 104
 105 void
 106 gpx_init(void)
 107 {
 108 time_t time1;
 109 struct tm time2;
 110 time1 = time(NULL);
 111 localtime_r(&time1, &time2);
 112 snprintf(XML_TZONE, sizeof(XML_TZONE), "%+03ld:%02ld",
 113          (time2.tm_gmtoff / 60 / 60), (time2.tm_gmtoff / 60) % 60);
 114 }
 115
 116 gboolean
 117 write_gpx(Path * path, GnomeVFSHandle * handle)
 118 {
 119         Point *curr = NULL;
 120         WayPoint *wcurr = NULL;
 121         gboolean trkseg_break = FALSE;
 122
 123         /* Find first non-zero point. */
 124         for (curr = path->head - 1, wcurr = path->whead; curr++ != path->tail;) {
 125                 if (curr->unity)
 126                         break;
 127                 else if (wcurr && curr == wcurr->point)
 128                         wcurr++;
 129         }
 130
 131         /* Write the header. */
 132         WRITE_STRING("<?xml version=\"1.0\"?>\n"
 133                      "<gpx version=\"1.0\" creator=\"mapper\" "
 134                      "xmlns=\"http://www.topografix.com/GPX/1/0\">\n"
 135                      "  <trk>\n" "    <trkseg>\n");
 136
 137         /* Curr points to first non-zero point. */
 138         for (curr--; curr++ != path->tail;) {
 139                 gdouble lat, lon;
 140                 if (curr->unity) {
 141                         gchar buffer[80];
 142                         gboolean first_sub = TRUE;
 143                         if (trkseg_break) {
 144                                 /* First trkpt of the segment - write trkseg header. */
 145                                 WRITE_STRING("    </trkseg>\n"
 146                                              "    <trkseg>\n");
 147                                 trkseg_break = FALSE;
 148                         }
 149                         unit2latlon(curr->unitx, curr->unity, lat, lon);
 150                         WRITE_STRING("      <trkpt lat=\"");
 151                         g_ascii_formatd(buffer, sizeof(buffer), "%.06f", lat);
 152                         WRITE_STRING(buffer);
 153                         WRITE_STRING("\" lon=\"");
 154                         g_ascii_formatd(buffer, sizeof(buffer), "%.06f", lon);
 155                         WRITE_STRING(buffer);
 156                         WRITE_STRING("\"");
 157
 158                         /* write the elevation */
 159                         if (!isnan(curr->altitude)) {
 160                                 if (first_sub) {
 161                                         WRITE_STRING(">\n");
 162                                         first_sub = FALSE;
 163                                 }
 164                                 WRITE_STRING("        <ele>");
 165                                 {
 166                                         g_ascii_formatd(buffer, 80, "%.2f",
 167                                                         curr->altitude);
 168                                         WRITE_STRING(buffer);
 169                                 }
 170                                 WRITE_STRING("</ele>\n");
 171                         }
 172
 173                         /* write the time */
 174                         if (curr->time) {
 175                                 if (first_sub) {
 176                                         WRITE_STRING(">\n");
 177                                         first_sub = FALSE;
 178                                 }
 179                                 WRITE_STRING("        <time>");
 180                                 strftime(buffer, 80, XML_DATE_FORMAT,
 181                                          localtime(&curr->time));
 182                                 WRITE_STRING(buffer);
 183                                 WRITE_STRING(XML_TZONE);
 184                                 WRITE_STRING("</time>\n");
 185                         }
 186
 187                         if (wcurr && curr == wcurr->point) {
 188                                 if (first_sub) {
 189                                         WRITE_STRING(">\n");
 190                                         first_sub = FALSE;
 191                                 }
 192                                 WRITE_STRING("        <desc>");
 193                                 WRITE_STRING(wcurr->desc);
 194                                 WRITE_STRING("</desc>\n");
 195                                 wcurr++;
 196                         }
 197                         if (first_sub) {
 198                                 WRITE_STRING("/>\n");
 199                         } else {
 200                                 WRITE_STRING("      </trkpt>\n");
 201                         }
 202                 } else
 203                         trkseg_break = TRUE;
 204         }
 205
 206         /* Write the footer. */
 207         WRITE_STRING("    </trkseg>\n" "  </trk>\n" "</gpx>\n");
 208
 209         return TRUE;
 210 }
 211
 212 /**
 213  * Handle a start tag in the parsing of a GPX file.
 214  */
 215 #define MACRO_SET_UNKNOWN() { \
 216     data->prev_state = data->state; \
 217     data->state = UNKNOWN; \
 218     data->unknown_depth = 1; \
 219 }
 220
 221 static void
 222 gpx_start_element(SaxData * data, const xmlChar * name, const xmlChar ** attrs)
 223 {
 224
 225         switch (data->state) {
 226         case ERROR:
 227                 break;
 228         case START:
 229                 if (!strcmp((gchar *) name, "gpx"))
 230                         data->state = INSIDE_GPX;
 231                 else
 232                         MACRO_SET_UNKNOWN();
 233                 break;
 234         case INSIDE_GPX:
 235                 if (!strcmp((gchar *) name, "trk"))
 236                         data->state = INSIDE_PATH;
 237                 else
 238                         MACRO_SET_UNKNOWN();
 239                 break;
 240         case INSIDE_PATH:
 241                 if (!strcmp((gchar *) name, "trkseg")) {
 242                         data->state = INSIDE_PATH_SEGMENT;
 243                         data->at_least_one_trkpt = FALSE;
 244                 } else
 245                         MACRO_SET_UNKNOWN();
 246                 break;
 247         case INSIDE_PATH_SEGMENT:
 248                 if (!strcmp((gchar *) name, "trkpt")) {
 249                         const xmlChar **curr_attr;
 250                         gchar *error_check;
 251                         gdouble lat = 0.f, lon = 0.f;
 252                         gboolean has_lat, has_lon;
 253                         has_lat = FALSE;
 254                         has_lon = FALSE;
 255                         for (curr_attr = attrs; *curr_attr != NULL;) {
 256                                 const gchar *attr_name = *curr_attr++;
 257                                 const gchar *attr_val = *curr_attr++;
 258                                 if (!strcmp(attr_name, "lat")) {
 259                                         lat = g_ascii_strtod(attr_val, &error_check);
 260                                         if (error_check != attr_val)
 261                                                 has_lat = TRUE;
 262                                 } else if (!strcmp(attr_name, "lon")) {
 263                                         lon = g_ascii_strtod(attr_val, &error_check);
 264                                         if (error_check != attr_val)
 265                                                 has_lon = TRUE;
 266                                 }
 267                         }
 268                         if (has_lat && has_lon) {
 269                                 MACRO_PATH_INCREMENT_TAIL(data->path);
 270                                 latlon2unit(lat, lon, data->path.tail->unitx, data->path.tail->unity);
 271                                 data->path.tail->time = 0;
 272                                 data->path.tail->altitude = NAN;
 273                                 data->state = INSIDE_PATH_POINT;
 274                         } else
 275                                 data->state = ERROR;
 276                 } else
 277                         MACRO_SET_UNKNOWN();
 278                 break;
 279         case INSIDE_PATH_POINT:
 280                 if (!strcmp((gchar *) name, "time"))
 281                         data->state = INSIDE_PATH_POINT_TIME;
 282                 else if (!strcmp((gchar *) name, "ele"))
 283                         data->state = INSIDE_PATH_POINT_ELE;
 284                 else if (!strcmp((gchar *) name, "desc"))
 285                         data->state = INSIDE_PATH_POINT_DESC;
 286
 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
 306         switch (data->state) {
 307         case ERROR:
 308                 break;
 309         case START:
 310                 data->state = ERROR;
 311                 break;
 312         case INSIDE_GPX:
 313                 if (!strcmp((gchar *) name, "gpx"))
 314                         data->state = FINISH;
 315                 else
 316                         data->state = ERROR;
 317                 break;
 318         case INSIDE_PATH:
 319                 if (!strcmp((gchar *) name, "trk"))
 320                         data->state = INSIDE_GPX;
 321                 else
 322                         data->state = ERROR;
 323                 break;
 324         case INSIDE_PATH_SEGMENT:
 325                 if (!strcmp((gchar *) name, "trkseg")) {
 326                         if (data->at_least_one_trkpt) {
 327                                 MACRO_PATH_INCREMENT_TAIL(data->path);
 328                                 *data->path.tail = _point_null;
 329                         }
 330                         data->state = INSIDE_PATH;
 331                 } else
 332                         data->state = ERROR;
 333                 break;
 334         case INSIDE_PATH_POINT:
 335                 if (!strcmp((gchar *) name, "trkpt")) {
 336                         data->state = INSIDE_PATH_SEGMENT;
 337                         data->at_least_one_trkpt = TRUE;
 338                 } else
 339                         data->state = ERROR;
 340                 break;
 341         case INSIDE_PATH_POINT_ELE:
 342                 if (!strcmp((gchar *) name, "ele")) {
 343                         gchar *error_check;
 344                         data->path.tail->altitude = g_ascii_strtod(data->chars->str, &error_check);
 345                         if (error_check == data->chars->str)
 346                                 data->path.tail->altitude = NAN;
 347                         data->state = INSIDE_PATH_POINT;
 348                         g_string_free(data->chars, TRUE);
 349                         data->chars = g_string_new("");
 350                 } else
 351                         data->state = ERROR;
 352                 break;
 353         case INSIDE_PATH_POINT_TIME:
 354                 if (!strcmp((gchar *) name, "time")) {
 355                         struct tm time;
 356                         gchar *ptr;
 357
 358                         if (NULL == (ptr = strptime(data->chars->str,
 359                                                     XML_DATE_FORMAT, &time)))
 360                                 /* Failed to parse dateTime format. */
 361                                 data->state = ERROR;
 362                         else {
 363                                 /* Parse was successful. Now we have to parse timezone.
 364                                  * From here on, if there is an error, I just assume local
 365                                  * timezone.  Yes, this is not proper XML, but I don't
 366                                  * care. */
 367                                 gchar *error_check;
 368
 369                                 /* First, set time in "local" time zone. */
 370                                 data->path.tail->time = (mktime(&time));
 371
 372                                 /* Now, skip inconsequential characters */
 373                                 while (*ptr && *ptr != 'Z' && *ptr != '-'
 374                                        && *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
 382                                                  * offset. */
 383                                                 data->path.tail->time += time.tm_gmtoff;
 384                                         else {
 385                                                 /* Not Zulu (UTC). Must parse hours and minutes. */
 386                                                 gint offhours =
 387                                                     strtol(ptr, &error_check,
 388                                                            10);
 389                                                 if (error_check != ptr
 390                                                     && *(ptr =
 391                                                          error_check) == ':') {
 392                                                         /* Parse of hours worked. Check minutes. */
 393                                                         gint offmins =
 394                                                             strtol(ptr + 1,
 395                                                                    &error_check,
 396                                                                    10);
 397                                                         if (error_check !=
 398                                                             (ptr + 1)) {
 399                                                                 /* Parse of minutes worked. Calculate. */
 400                                                                 data->path.tail->time +=
 401                                                                     (time.tm_gmtoff -
 402                                                                      (offhours * 60 * 60 + offmins * 60));
 403                                                         }
 404                                                 }
 405                                         }
 406                                 }
 407                                 /* Successfully parsed dateTime. */
 408                                 data->state = INSIDE_PATH_POINT;
 409                         }
 410
 411                         g_string_free(data->chars, TRUE);
 412                         data->chars = g_string_new("");
 413                 } else
 414                         data->state = ERROR;
 415                 break;
 416         case INSIDE_PATH_POINT_DESC:
 417                 /* only parse description for routes */
 418                 if (!strcmp((gchar *) name, "desc")) {
 419                         MACRO_PATH_INCREMENT_WTAIL(data->path);
 420                         data->path.wtail->point = data->path.tail;
 421                         data->path.wtail->desc
 422                             = g_string_free(data->chars, FALSE);
 423                         data->chars = g_string_new("");
 424                         data->state = INSIDE_PATH_POINT;
 425                 } else
 426                         data->state = ERROR;
 427                 break;
 428         case UNKNOWN:
 429                 if (!--data->unknown_depth)
 430                         data->state = data->prev_state;
 431                 else
 432                         data->state = ERROR;
 433                 break;
 434         default:
 435                 ;
 436         }
 437
 438 }
 439
 440 /**
 441  * Handle char data in the parsing of a GPX file.
 442  */
 443 static void
 444 gpx_chars(SaxData * data, const xmlChar * ch, int len)
 445 {
 446         guint i;
 447
 448         switch (data->state) {
 449         case ERROR:
 450         case UNKNOWN:
 451                 break;
 452         case INSIDE_PATH_POINT_ELE:
 453         case INSIDE_PATH_POINT_TIME:
 454         case INSIDE_PATH_POINT_DESC:
 455                 for (i = 0; i < len; i++)
 456                         data->chars = g_string_append_c(data->chars, ch[i]);
 457                 vprintf("%s\n", data->chars->str);
 458                 break;
 459         default:
 460                 break;
 461         }
 462
 463 }
 464
 465 /**
 466  * Handle an entity in the parsing of a GPX file.  We don't do anything
 467  * special here.
 468  */
 469 static xmlEntityPtr
 470 gpx_get_entity(SaxData * data, const xmlChar * name)
 471 {
 472         return xmlGetPredefinedEntity(name);
 473 }
 474
 475 /**
 476  * Handle an error in the parsing of a GPX file.
 477  */
 478 static void
 479 gpx_error(SaxData * data, const gchar * msg, ...)
 480 {
 481         data->state = ERROR;
 482 }
 483
 484 gboolean
 485 parse_gpx(Path * to_replace, gchar * buffer, gint size, gint policy_old)
 486 {
 487         SaxData data;
 488         xmlSAXHandler sax_handler;
 489
 490         MACRO_PATH_INIT(data.path);
 491         data.state = START;
 492         data.chars = g_string_new("");
 493
 494         memset(&sax_handler, 0, sizeof(sax_handler));
 495         sax_handler.characters = (charactersSAXFunc) gpx_chars;
 496         sax_handler.startElement = (startElementSAXFunc) gpx_start_element;
 497         sax_handler.endElement = (endElementSAXFunc) gpx_end_element;
 498         sax_handler.entityDecl = (entityDeclSAXFunc) gpx_get_entity;
 499         sax_handler.warning = (warningSAXFunc) gpx_error;
 500         sax_handler.error = (errorSAXFunc) gpx_error;
 501         sax_handler.fatalError = (fatalErrorSAXFunc) gpx_error;
 502
 503         xmlSAXUserParseMemory(&sax_handler, &data, buffer, size);
 504         g_string_free(data.chars, TRUE);
 505
 506         if (data.state != FINISH) {
 507                 return FALSE;
 508         }
 509
 510         if (policy_old && to_replace->head != to_replace->tail) {
 511                 Point *src_first;
 512                 Path *src, *dest;
 513
 514                 if (policy_old > 0) {
 515                         /* Append to current path. Make sure last path point is zero. */
 516                         if (to_replace->tail->unity != 0) {
 517                                 MACRO_PATH_INCREMENT_TAIL((*to_replace));
 518                                 *to_replace->tail = _point_null;
 519                         }
 520                         src = &data.path;
 521                         dest = to_replace;
 522                 } else {
 523                         /* Prepend to current route. */
 524                         src = to_replace;
 525                         dest = &data.path;
 526                 }
 527
 528                 /* Find src_first non-zero point. */
 529                 for (src_first = src->head - 1; src_first++ != src->tail;)
 530                         if (src_first->unity)
 531                                 break;
 532
 533                 /* Append route points from src to dest. */
 534                 if (src->tail >= src_first) {
 535                         WayPoint *curr;
 536                         guint num_dest_points = dest->tail - dest->head + 1;
 537                         guint num_src_points = src->tail - src_first + 1;
 538
 539                         /* Adjust dest->tail to be able to fit src route data
 540                          * plus room for more route data. */
 541                         path_resize(dest, num_dest_points + num_src_points);
 542
 543                         memcpy(dest->tail + 1, src_first,
 544                                num_src_points * sizeof(Point));
 545
 546                         dest->tail += num_src_points;
 547
 548                         /* Append waypoints from src to dest->. */
 549                         path_wresize(dest, (dest->wtail - dest->whead)
 550                                      + (src->wtail - src->whead) + 2);
 551                         for (curr = src->whead - 1; curr++ != src->wtail;) {
 552                                 (++(dest->wtail))->point =
 553                                     dest->head + num_dest_points +
 554                                     (curr->point - src_first);
 555                                 dest->wtail->desc = curr->desc;
 556                         }
 557
 558                 }
 559
 560                 /* Kill old route - don't use MACRO_PATH_FREE(), because that
 561                  * would free the string desc's that we just moved to data.route. */
 562                 g_free(src->head);
 563                 g_free(src->whead);
 564                 if (policy_old < 0)
 565                         (*to_replace) = *dest;
 566         } else {
 567                 MACRO_PATH_FREE((*to_replace));
 568                 /* Overwrite with data.route. */
 569                 (*to_replace) = data.path;
 570                 path_resize(to_replace,
 571                             to_replace->tail - to_replace->head + 1);
 572                 path_wresize(to_replace,
 573                              to_replace->wtail - to_replace->whead + 1);
 574         }
 575
 576         return TRUE;
 577 }