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
  58 #define XML_DATE_FORMAT "%FT%T"
  59
  60 #define WRITE_STRING(string) { \
  61     GnomeVFSResult vfs_result; \
  62     GnomeVFSFileSize size; \
  63     if(GNOME_VFS_OK != (vfs_result = gnome_vfs_write( \
  64                     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"), \
  69                 _("File is incomplete."), \
  70                 gnome_vfs_result_to_string(vfs_result)); \
  71         popup_error(_window, buffer); \
  72         return FALSE; \
  73     } \
  74 }
  75
  76 /** This enum defines the states of the SAX parsing state machine. */
  77 typedef enum {
  78         START,
  79         INSIDE_GPX,
  80         INSIDE_PATH,
  81         INSIDE_PATH_SEGMENT,
  82         INSIDE_PATH_POINT,
  83         INSIDE_PATH_POINT_ELE,
  84         INSIDE_PATH_POINT_TIME,
  85         INSIDE_PATH_POINT_DESC,
  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 }
 219
 220 static void
 221 gpx_start_element(SaxData * data, const xmlChar * name, const xmlChar ** attrs)
 222 {
 223
 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
 286                 else
 287                         MACRO_SET_UNKNOWN();
 288                 break;
 289         case UNKNOWN:
 290                 data->unknown_depth++;
 291                 break;
 292         default:
 293                 ;
 294         }
 295
 296 }
 297
 298 /**
 299  * Handle an end tag in the parsing of a GPX file.
 300  */
 301 static void
 302 gpx_end_element(SaxData * data, const xmlChar * name)
 303 {
 304
 305         switch (data->state) {
 306         case ERROR:
 307                 break;
 308         case START:
 309                 data->state = ERROR;
 310                 break;
 311         case INSIDE_GPX:
 312                 if (!strcmp((gchar *) name, "gpx"))
 313                         data->state = FINISH;
 314                 else
 315                         data->state = ERROR;
 316                 break;
 317         case INSIDE_PATH:
 318                 if (!strcmp((gchar *) name, "trk"))
 319                         data->state = INSIDE_GPX;
 320                 else
 321                         data->state = ERROR;
 322                 break;
 323         case INSIDE_PATH_SEGMENT:
 324                 if (!strcmp((gchar *) name, "trkseg")) {
 325                         if (data->at_least_one_trkpt) {
 326                                 MACRO_PATH_INCREMENT_TAIL(data->path);
 327                                 *data->path.tail = _point_null;
 328                         }
 329                         data->state = INSIDE_PATH;
 330                 } else
 331                         data->state = ERROR;
 332                 break;
 333         case INSIDE_PATH_POINT:
 334                 if (!strcmp((gchar *) name, "trkpt")) {
 335                         data->state = INSIDE_PATH_SEGMENT;
 336                         data->at_least_one_trkpt = TRUE;
 337                 } else
 338                         data->state = ERROR;
 339                 break;
 340         case INSIDE_PATH_POINT_ELE:
 341                 if (!strcmp((gchar *) name, "ele")) {
 342                         gchar *error_check;
 343                         data->path.tail->altitude = g_ascii_strtod(data->chars->str, &error_check);
 344                         if (error_check == data->chars->str)
 345                                 data->path.tail->altitude = NAN;
 346                         data->state = INSIDE_PATH_POINT;
 347                         g_string_free(data->chars, TRUE);
 348                         data->chars = g_string_new("");
 349                 } else
 350                         data->state = ERROR;
 351                 break;
 352         case INSIDE_PATH_POINT_TIME:
 353                 if (!strcmp((gchar *) name, "time")) {
 354                         struct tm time;
 355                         gchar *ptr;
 356
 357                         if (NULL == (ptr = strptime(data->chars->str,
 358                                                     XML_DATE_FORMAT, &time)))
 359                                 /* Failed to parse dateTime format. */
 360                                 data->state = ERROR;
 361                         else {
 362                                 /* Parse was successful. Now we have to parse timezone.
 363                                  * From here on, if there is an error, I just assume local
 364                                  * timezone.  Yes, this is not proper XML, but I don't
 365                                  * care. */
 366                                 gchar *error_check;
 367
 368                                 /* First, set time in "local" time zone. */
 369                                 data->path.tail->time = (mktime(&time));
 370
 371                                 /* Now, skip inconsequential characters */
 372                                 while (*ptr && *ptr != 'Z' && *ptr != '-'
 373                                        && *ptr != '+')
 374                                         ptr++;
 375
 376                                 /* Check if we ran to the end of the string. */
 377                                 if (*ptr) {
 378                                         /* Next character is either 'Z', '-', or '+' */
 379                                         if (*ptr == 'Z')
 380                                                 /* Zulu (UTC) time. Undo the local time zone's
 381                                                  * offset. */
 382                                                 data->path.tail->time += time.tm_gmtoff;
 383                                         else {
 384                                                 /* Not Zulu (UTC). Must parse hours and minutes. */
 385                                                 gint offhours =
 386                                                     strtol(ptr, &error_check,
 387                                                            10);
 388                                                 if (error_check != ptr
 389                                                     && *(ptr =
 390                                                          error_check) == ':') {
 391                                                         /* Parse of hours worked. Check minutes. */
 392                                                         gint offmins =
 393                                                             strtol(ptr + 1,
 394                                                                    &error_check,
 395                                                                    10);
 396                                                         if (error_check !=
 397                                                             (ptr + 1)) {
 398                                                                 /* Parse of minutes worked. Calculate. */
 399                                                                 data->path.tail->time +=
 400                                                                     (time.tm_gmtoff -
 401                                                                      (offhours * 60 * 60 + offmins * 60));
 402                                                         }
 403                                                 }
 404                                         }
 405                                 }
 406                                 /* Successfully parsed dateTime. */
 407                                 data->state = INSIDE_PATH_POINT;
 408                         }
 409
 410                         g_string_free(data->chars, TRUE);
 411                         data->chars = g_string_new("");
 412                 } else
 413                         data->state = ERROR;
 414                 break;
 415         case INSIDE_PATH_POINT_DESC:
 416                 /* only parse description for routes */
 417                 if (!strcmp((gchar *) name, "desc")) {
 418                         MACRO_PATH_INCREMENT_WTAIL(data->path);
 419                         data->path.wtail->point = data->path.tail;
 420                         data->path.wtail->desc
 421                             = g_string_free(data->chars, FALSE);
 422                         data->chars = g_string_new("");
 423                         data->state = INSIDE_PATH_POINT;
 424                 } else
 425                         data->state = ERROR;
 426                 break;
 427         case UNKNOWN:
 428                 if (!--data->unknown_depth)
 429                         data->state = data->prev_state;
 430                 else
 431                         data->state = ERROR;
 432                 break;
 433         default:
 434                 ;
 435         }
 436
 437 }
 438
 439 /**
 440  * Handle char data in the parsing of a GPX file.
 441  */
 442 static void
 443 gpx_chars(SaxData * data, const xmlChar * ch, int len)
 444 {
 445         guint i;
 446
 447         switch (data->state) {
 448         case ERROR:
 449         case UNKNOWN:
 450                 break;
 451         case INSIDE_PATH_POINT_ELE:
 452         case INSIDE_PATH_POINT_TIME:
 453         case INSIDE_PATH_POINT_DESC:
 454                 for (i = 0; i < len; i++)
 455                         data->chars = g_string_append_c(data->chars, ch[i]);
 456                 vprintf("%s\n", data->chars->str);
 457                 break;
 458         default:
 459                 break;
 460         }
 461
 462 }
 463
 464 /**
 465  * Handle an entity in the parsing of a GPX file.  We don't do anything
 466  * special here.
 467  */
 468 static xmlEntityPtr
 469 gpx_get_entity(SaxData * data, const xmlChar * name)
 470 {
 471         return xmlGetPredefinedEntity(name);
 472 }
 473
 474 /**
 475  * Handle an error in the parsing of a GPX file.
 476  */
 477 static void
 478 gpx_error(SaxData * data, const gchar * msg, ...)
 479 {
 480         data->state = ERROR;
 481 }
 482
 483 gboolean
 484 parse_gpx(Path * to_replace, gchar * buffer, gint size, gint policy_old)
 485 {
 486         SaxData data;
 487         xmlSAXHandler sax_handler;
 488
 489         MACRO_PATH_INIT(data.path);
 490         data.state = START;
 491         data.chars = g_string_new("");
 492
 493         memset(&sax_handler, 0, sizeof(sax_handler));
 494         sax_handler.characters = (charactersSAXFunc) gpx_chars;
 495         sax_handler.startElement = (startElementSAXFunc) gpx_start_element;
 496         sax_handler.endElement = (endElementSAXFunc) gpx_end_element;
 497         sax_handler.entityDecl = (entityDeclSAXFunc) gpx_get_entity;
 498         sax_handler.warning = (warningSAXFunc) gpx_error;
 499         sax_handler.error = (errorSAXFunc) gpx_error;
 500         sax_handler.fatalError = (fatalErrorSAXFunc) gpx_error;
 501
 502         xmlSAXUserParseMemory(&sax_handler, &data, buffer, size);
 503         g_string_free(data.chars, TRUE);
 504
 505         if (data.state != FINISH) {
 506                 return FALSE;
 507         }
 508
 509         if (policy_old && to_replace->head != to_replace->tail) {
 510                 Point *src_first;
 511                 Path *src, *dest;
 512
 513                 if (policy_old > 0) {
 514                         /* Append to current path. Make sure last path point is zero. */
 515                         if (to_replace->tail->unity != 0) {
 516                                 MACRO_PATH_INCREMENT_TAIL((*to_replace));
 517                                 *to_replace->tail = _point_null;
 518                         }
 519                         src = &data.path;
 520                         dest = to_replace;
 521                 } else {
 522                         /* Prepend to current route. */
 523                         src = to_replace;
 524                         dest = &data.path;
 525                 }
 526
 527                 /* Find src_first non-zero point. */
 528                 for (src_first = src->head - 1; src_first++ != src->tail;)
 529                         if (src_first->unity)
 530                                 break;
 531
 532                 /* Append route points from src to dest. */
 533                 if (src->tail >= src_first) {
 534                         WayPoint *curr;
 535                         guint num_dest_points = dest->tail - dest->head + 1;
 536                         guint num_src_points = src->tail - src_first + 1;
 537
 538                         /* Adjust dest->tail to be able to fit src route data
 539                          * plus room for more route data. */
 540                         path_resize(dest, num_dest_points + num_src_points);
 541
 542                         memcpy(dest->tail + 1, src_first,
 543                                num_src_points * sizeof(Point));
 544
 545                         dest->tail += num_src_points;
 546
 547                         /* Append waypoints from src to dest->. */
 548                         path_wresize(dest, (dest->wtail - dest->whead)
 549                                      + (src->wtail - src->whead) + 2);
 550                         for (curr = src->whead - 1; curr++ != src->wtail;) {
 551                                 (++(dest->wtail))->point =
 552                                     dest->head + num_dest_points +
 553                                     (curr->point - src_first);
 554                                 dest->wtail->desc = curr->desc;
 555                         }
 556
 557                 }
 558
 559                 /* Kill old route - don't use MACRO_PATH_FREE(), because that
 560                  * would free the string desc's that we just moved to data.route. */
 561                 g_free(src->head);
 562                 g_free(src->whead);
 563                 if (policy_old < 0)
 564                         (*to_replace) = *dest;
 565         } else {
 566                 MACRO_PATH_FREE((*to_replace));
 567                 /* Overwrite with data.route. */
 568                 (*to_replace) = data.path;
 569                 path_resize(to_replace,
 570                             to_replace->tail - to_replace->head + 1);
 571                 path_wresize(to_replace,
 572                              to_replace->wtail - to_replace->whead + 1);
 573         }
 574
 575         return TRUE;
 576 }