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