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 "map.h"
  58 #include "gpx.h"
  59
  60 #define XML_DATE_FORMAT "%FT%T"
  61
  62 #define WRITE_STRING(string) { \
  63     GnomeVFSResult vfs_result; \
  64     GnomeVFSFileSize size; \
  65     if(GNOME_VFS_OK != (vfs_result = gnome_vfs_write( \
  66                     handle, (string), strlen((string)), &size))) \
  67     { \
  68         gchar buffer[BUFFER_SIZE]; \
  69         g_snprintf(buffer, sizeof(buffer), \
  70                 "%s:\n%s\n%s", _("Error while writing to file"), \
  71                 _("File is incomplete."), \
  72                 gnome_vfs_result_to_string(vfs_result)); \
  73         popup_error(_window, buffer); \
  74         return FALSE; \
  75     } \
  76 }
  77
  78 /** This enum defines the states of the SAX parsing state machine. */
  79 typedef enum {
  80         START,
  81         INSIDE_GPX,
  82         INSIDE_PATH,
  83         INSIDE_PATH_SEGMENT,
  84         INSIDE_PATH_POINT,
  85         INSIDE_PATH_POINT_ELE,
  86         INSIDE_PATH_POINT_TIME,
  87         INSIDE_PATH_POINT_DESC,
  88         FINISH,
  89         UNKNOWN,
  90         ERROR,
  91 } SaxState;
  92
  93 /** Data used during the SAX parsing operation. */
  94 typedef struct _SaxData SaxData;
  95 struct _SaxData {
  96         Path path;
  97         SaxState state;
  98         SaxState prev_state;
  99         guint unknown_depth;
 100         gboolean at_least_one_trkpt;
 101         GString *chars;
 102 };
 103
 104 gchar XML_TZONE[7];
 105
 106 void
 107 gpx_init(void)
 108 {
 109 time_t time1;
 110 struct tm time2;
 111 time1 = time(NULL);
 112 localtime_r(&time1, &time2);
 113 g_snprintf(XML_TZONE, sizeof(XML_TZONE), "%+03ld:%02ld",
 114          (time2.tm_gmtoff / 60 / 60), (time2.tm_gmtoff / 60) % 60);
 115 }
 116
 117 gboolean
 118 write_gpx(Path * path, GnomeVFSHandle * handle)
 119 {
 120         Point *curr = NULL;
 121         WayPoint *wcurr = NULL;
 122         gboolean trkseg_break = FALSE;
 123
 124         /* Find first non-zero point. */
 125         for (curr = path->head - 1, wcurr = path->whead; curr++ != path->tail;) {
 126                 if (curr->unity)
 127                         break;
 128                 else if (wcurr && curr == wcurr->point)
 129                         wcurr++;
 130         }
 131
 132         /* Write the header. */
 133         WRITE_STRING("<?xml version=\"1.0\"?>\n"
 134                      "<gpx version=\"1.0\" creator=\"mapper\" "
 135                      "xmlns=\"http://www.topografix.com/GPX/1/0\">\n"
 136                      "  <trk>\n" "    <trkseg>\n");
 137
 138         /* Curr points to first non-zero point. */
 139         for (curr--; curr++ != path->tail;) {
 140                 gdouble lat, lon;
 141                 if (curr->unity) {
 142                         gchar buffer[80];
 143                         gboolean first_sub = TRUE;
 144                         if (trkseg_break) {
 145                                 /* First trkpt of the segment - write trkseg header. */
 146                                 WRITE_STRING("    </trkseg>\n"
 147                                              "    <trkseg>\n");
 148                                 trkseg_break = FALSE;
 149                         }
 150                         unit2latlon(curr->unitx, curr->unity, lat, lon);
 151                         WRITE_STRING("      <trkpt lat=\"");
 152                         g_ascii_formatd(buffer, sizeof(buffer), "%.06f", lat);
 153                         WRITE_STRING(buffer);
 154                         WRITE_STRING("\" lon=\"");
 155                         g_ascii_formatd(buffer, sizeof(buffer), "%.06f", lon);
 156                         WRITE_STRING(buffer);
 157                         WRITE_STRING("\"");
 158
 159                         /* write the elevation */
 160                         if (!isnan(curr->altitude)) {
 161                                 if (first_sub) {
 162                                         WRITE_STRING(">\n");
 163                                         first_sub = FALSE;
 164                                 }
 165                                 WRITE_STRING("        <ele>");
 166                                 {
 167                                         g_ascii_formatd(buffer, 80, "%.2f",
 168                                                         curr->altitude);
 169                                         WRITE_STRING(buffer);
 170                                 }
 171                                 WRITE_STRING("</ele>\n");
 172                         }
 173
 174                         /* write the time */
 175                         if (curr->time) {
 176                                 if (first_sub) {
 177                                         WRITE_STRING(">\n");
 178                                         first_sub = FALSE;
 179                                 }
 180                                 WRITE_STRING("        <time>");
 181                                 strftime(buffer, 80, XML_DATE_FORMAT,
 182                                          localtime(&curr->time));
 183                                 WRITE_STRING(buffer);
 184                                 WRITE_STRING(XML_TZONE);
 185                                 WRITE_STRING("</time>\n");
 186                         }
 187
 188                         if (wcurr && curr == wcurr->point) {
 189                                 if (first_sub) {
 190                                         WRITE_STRING(">\n");
 191                                         first_sub = FALSE;
 192                                 }
 193                                 WRITE_STRING("        <desc>");
 194                                 WRITE_STRING(wcurr->desc);
 195                                 WRITE_STRING("</desc>\n");
 196                                 wcurr++;
 197                         }
 198                         if (first_sub) {
 199                                 WRITE_STRING("/>\n");
 200                         } else {
 201                                 WRITE_STRING("      </trkpt>\n");
 202                         }
 203                 } else
 204                         trkseg_break = TRUE;
 205         }
 206
 207         /* Write the footer. */
 208         WRITE_STRING("    </trkseg>\n" "  </trk>\n" "</gpx>\n");
 209
 210         return TRUE;
 211 }
 212
 213 /**
 214  * Handle a start tag in the parsing of a GPX file.
 215  */
 216 #define MACRO_SET_UNKNOWN() { \
 217     data->prev_state = data->state; \
 218     data->state = UNKNOWN; \
 219     data->unknown_depth = 1; \
 220 }
 221
 222 static void
 223 gpx_start_element(SaxData * data, const xmlChar * name, const xmlChar ** attrs)
 224 {
 225
 226         switch (data->state) {
 227         case ERROR:
 228                 break;
 229         case START:
 230                 if (!strcmp((gchar *) name, "gpx"))
 231                         data->state = INSIDE_GPX;
 232                 else
 233                         MACRO_SET_UNKNOWN();
 234                 break;
 235         case INSIDE_GPX:
 236                 if (!strcmp((gchar *) name, "trk"))
 237                         data->state = INSIDE_PATH;
 238                 else
 239                         MACRO_SET_UNKNOWN();
 240                 break;
 241         case INSIDE_PATH:
 242                 if (!strcmp((gchar *) name, "trkseg")) {
 243                         data->state = INSIDE_PATH_SEGMENT;
 244                         data->at_least_one_trkpt = FALSE;
 245                 } else
 246                         MACRO_SET_UNKNOWN();
 247                 break;
 248         case INSIDE_PATH_SEGMENT:
 249                 if (!strcmp((gchar *) name, "trkpt")) {
 250                         const xmlChar **curr_attr;
 251                         gchar *error_check;
 252                         gdouble lat = 0.f, lon = 0.f;
 253                         gboolean has_lat, has_lon;
 254                         has_lat = FALSE;
 255                         has_lon = FALSE;
 256                         for (curr_attr = attrs; *curr_attr != NULL;) {
 257                                 const gchar *attr_name = *curr_attr++;
 258                                 const gchar *attr_val = *curr_attr++;
 259                                 if (!strcmp(attr_name, "lat")) {
 260                                         lat = g_ascii_strtod(attr_val, &error_check);
 261                                         if (error_check != attr_val)
 262                                                 has_lat = TRUE;
 263                                 } else if (!strcmp(attr_name, "lon")) {
 264                                         lon = g_ascii_strtod(attr_val, &error_check);
 265                                         if (error_check != attr_val)
 266                                                 has_lon = TRUE;
 267                                 }
 268                         }
 269                         if (has_lat && has_lon) {
 270                                 MACRO_PATH_INCREMENT_TAIL(data->path);
 271                                 latlon2unit(lat, lon, data->path.tail->unitx, data->path.tail->unity);
 272                                 data->path.tail->time = 0;
 273                                 data->path.tail->altitude = NAN;
 274                                 data->state = INSIDE_PATH_POINT;
 275                         } else
 276                                 data->state = ERROR;
 277                 } else
 278                         MACRO_SET_UNKNOWN();
 279                 break;
 280         case INSIDE_PATH_POINT:
 281                 if (!strcmp((gchar *) name, "time"))
 282                         data->state = INSIDE_PATH_POINT_TIME;
 283                 else if (!strcmp((gchar *) name, "ele"))
 284                         data->state = INSIDE_PATH_POINT_ELE;
 285                 else if (!strcmp((gchar *) name, "desc"))
 286                         data->state = INSIDE_PATH_POINT_DESC;
 287
 288                 else
 289                         MACRO_SET_UNKNOWN();
 290                 break;
 291         case UNKNOWN:
 292                 data->unknown_depth++;
 293                 break;
 294         default:
 295                 ;
 296         }
 297
 298 }
 299
 300 /**
 301  * Handle an end tag in the parsing of a GPX file.
 302  */
 303 static void
 304 gpx_end_element(SaxData * data, const xmlChar * name)
 305 {
 306
 307         switch (data->state) {
 308         case ERROR:
 309                 break;
 310         case START:
 311                 data->state = ERROR;
 312                 break;
 313         case INSIDE_GPX:
 314                 if (!strcmp((gchar *) name, "gpx"))
 315                         data->state = FINISH;
 316                 else
 317                         data->state = ERROR;
 318                 break;
 319         case INSIDE_PATH:
 320                 if (!strcmp((gchar *) name, "trk"))
 321                         data->state = INSIDE_GPX;
 322                 else
 323                         data->state = ERROR;
 324                 break;
 325         case INSIDE_PATH_SEGMENT:
 326                 if (!strcmp((gchar *) name, "trkseg")) {
 327                         if (data->at_least_one_trkpt) {
 328                                 MACRO_PATH_INCREMENT_TAIL(data->path);
 329                                 *data->path.tail = _point_null;
 330                         }
 331                         data->state = INSIDE_PATH;
 332                 } else
 333                         data->state = ERROR;
 334                 break;
 335         case INSIDE_PATH_POINT:
 336                 if (!strcmp((gchar *) name, "trkpt")) {
 337                         data->state = INSIDE_PATH_SEGMENT;
 338                         data->at_least_one_trkpt = TRUE;
 339                 } else
 340                         data->state = ERROR;
 341                 break;
 342         case INSIDE_PATH_POINT_ELE:
 343                 if (!strcmp((gchar *) name, "ele")) {
 344                         gchar *error_check;
 345                         data->path.tail->altitude = g_ascii_strtod(data->chars->str, &error_check);
 346                         if (error_check == data->chars->str)
 347                                 data->path.tail->altitude = NAN;
 348                         data->state = INSIDE_PATH_POINT;
 349                         g_string_free(data->chars, TRUE);
 350                         data->chars = g_string_new("");
 351                 } else
 352                         data->state = ERROR;
 353                 break;
 354         case INSIDE_PATH_POINT_TIME:
 355                 if (!strcmp((gchar *) name, "time")) {
 356                         struct tm time;
 357                         gchar *ptr;
 358
 359                         if (NULL == (ptr = strptime(data->chars->str,
 360                                                     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 != '-'
 375                                        && *ptr != '+')
 376                                         ptr++;
 377
 378                                 /* Check if we ran to the end of the string. */
 379                                 if (*ptr) {
 380                                         /* Next character is either 'Z', '-', or '+' */
 381                                         if (*ptr == 'Z')
 382                                                 /* Zulu (UTC) time. Undo the local time zone's
 383                                                  * offset. */
 384                                                 data->path.tail->time += time.tm_gmtoff;
 385                                         else {
 386                                                 /* Not Zulu (UTC). Must parse hours and minutes. */
 387                                                 gint offhours =
 388                                                     strtol(ptr, &error_check,
 389                                                            10);
 390                                                 if (error_check != ptr
 391                                                     && *(ptr =
 392                                                          error_check) == ':') {
 393                                                         /* Parse of hours worked. Check minutes. */
 394                                                         gint offmins =
 395                                                             strtol(ptr + 1,
 396                                                                    &error_check,
 397                                                                    10);
 398                                                         if (error_check !=
 399                                                             (ptr + 1)) {
 400                                                                 /* Parse of minutes worked. Calculate. */
 401                                                                 data->path.tail->time +=
 402                                                                     (time.tm_gmtoff -
 403                                                                      (offhours * 60 * 60 + offmins * 60));
 404                                                         }
 405                                                 }
 406                                         }
 407                                 }
 408                                 /* Successfully parsed dateTime. */
 409                                 data->state = INSIDE_PATH_POINT;
 410                         }
 411
 412                         g_string_free(data->chars, TRUE);
 413                         data->chars = g_string_new("");
 414                 } else
 415                         data->state = ERROR;
 416                 break;
 417         case INSIDE_PATH_POINT_DESC:
 418                 /* only parse description for routes */
 419                 if (!strcmp((gchar *) name, "desc")) {
 420                         MACRO_PATH_INCREMENT_WTAIL(data->path);
 421                         data->path.wtail->point = data->path.tail;
 422                         data->path.wtail->desc
 423                             = g_string_free(data->chars, FALSE);
 424                         data->chars = g_string_new("");
 425                         data->state = INSIDE_PATH_POINT;
 426                 } else
 427                         data->state = ERROR;
 428                 break;
 429         case UNKNOWN:
 430                 if (!--data->unknown_depth)
 431                         data->state = data->prev_state;
 432                 else
 433                         data->state = ERROR;
 434                 break;
 435         default:
 436                 ;
 437         }
 438
 439 }
 440
 441 /**
 442  * Handle char data in the parsing of a GPX file.
 443  */
 444 static void
 445 gpx_chars(SaxData * data, const xmlChar * ch, int len)
 446 {
 447         guint i;
 448
 449         switch (data->state) {
 450         case ERROR:
 451         case UNKNOWN:
 452                 break;
 453         case INSIDE_PATH_POINT_ELE:
 454         case INSIDE_PATH_POINT_TIME:
 455         case INSIDE_PATH_POINT_DESC:
 456                 for (i = 0; i < len; i++)
 457                         data->chars = g_string_append_c(data->chars, ch[i]);
 458                 vprintf("%s\n", data->chars->str);
 459                 break;
 460         default:
 461                 break;
 462         }
 463
 464 }
 465
 466 /**
 467  * Handle an entity in the parsing of a GPX file.  We don't do anything
 468  * special here.
 469  */
 470 static xmlEntityPtr
 471 gpx_get_entity(SaxData * data, const xmlChar * name)
 472 {
 473         return xmlGetPredefinedEntity(name);
 474 }
 475
 476 /**
 477  * Handle an error in the parsing of a GPX file.
 478  */
 479 static void
 480 gpx_error(SaxData * data, const gchar * msg, ...)
 481 {
 482         data->state = ERROR;
 483 }
 484
 485 gboolean
 486 parse_gpx(Path * to_replace, gchar * buffer, gint size, gint policy_old)
 487 {
 488         SaxData data;
 489         xmlSAXHandler sax_handler;
 490
 491         MACRO_PATH_INIT(data.path);
 492         data.state = START;
 493         data.chars = g_string_new("");
 494
 495         memset(&sax_handler, 0, sizeof(sax_handler));
 496         sax_handler.characters = (charactersSAXFunc) gpx_chars;
 497         sax_handler.startElement = (startElementSAXFunc) gpx_start_element;
 498         sax_handler.endElement = (endElementSAXFunc) gpx_end_element;
 499         sax_handler.entityDecl = (entityDeclSAXFunc) gpx_get_entity;
 500         sax_handler.warning = (warningSAXFunc) gpx_error;
 501         sax_handler.error = (errorSAXFunc) gpx_error;
 502         sax_handler.fatalError = (fatalErrorSAXFunc) gpx_error;
 503
 504         xmlSAXUserParseMemory(&sax_handler, &data, buffer, size);
 505         g_string_free(data.chars, TRUE);
 506
 507         if (data.state != FINISH) {
 508                 return FALSE;
 509         }
 510
 511         if (policy_old && to_replace->head != to_replace->tail) {
 512                 Point *src_first;
 513                 Path *src, *dest;
 514
 515                 if (policy_old > 0) {
 516                         /* Append to current path. Make sure last path point is zero. */
 517                         if (to_replace->tail->unity != 0) {
 518                                 MACRO_PATH_INCREMENT_TAIL((*to_replace));
 519                                 *to_replace->tail = _point_null;
 520                         }
 521                         src = &data.path;
 522                         dest = to_replace;
 523                 } else {
 524                         /* Prepend to current route. */
 525                         src = to_replace;
 526                         dest = &data.path;
 527                 }
 528
 529                 /* Find src_first non-zero point. */
 530                 for (src_first = src->head - 1; src_first++ != src->tail;)
 531                         if (src_first->unity)
 532                                 break;
 533
 534                 /* Append route points from src to dest. */
 535                 if (src->tail >= src_first) {
 536                         WayPoint *curr;
 537                         guint num_dest_points = dest->tail - dest->head + 1;
 538                         guint num_src_points = src->tail - src_first + 1;
 539
 540                         /* Adjust dest->tail to be able to fit src route data
 541                          * plus room for more route data. */
 542                         path_resize(dest, num_dest_points + num_src_points);
 543
 544                         memcpy(dest->tail + 1, src_first,
 545                                num_src_points * sizeof(Point));
 546
 547                         dest->tail += num_src_points;
 548
 549                         /* Append waypoints from src to dest->. */
 550                         path_wresize(dest, (dest->wtail - dest->whead)
 551                                      + (src->wtail - src->whead) + 2);
 552                         for (curr = src->whead - 1; curr++ != src->wtail;) {
 553                                 (++(dest->wtail))->point =
 554                                     dest->head + num_dest_points +
 555                                     (curr->point - src_first);
 556                                 dest->wtail->desc = curr->desc;
 557                         }
 558
 559                 }
 560
 561                 /* Kill old route - don't use MACRO_PATH_FREE(), because that
 562                  * would free the string desc's that we just moved to data.route. */
 563                 g_free(src->head);
 564                 g_free(src->whead);
 565                 if (policy_old < 0)
 566                         (*to_replace) = *dest;
 567         } else {
 568                 MACRO_PATH_FREE((*to_replace));
 569                 /* Overwrite with data.route. */
 570                 (*to_replace) = data.path;
 571                 path_resize(to_replace,
 572                             to_replace->tail - to_replace->head + 1);
 573                 path_wresize(to_replace,
 574                              to_replace->wtail - to_replace->whead + 1);
 575         }
 576
 577         return TRUE;
 578 }