src/file.c

   1 /*
   2  * viking -- GPS Data and Topo Analyzer, Explorer, and Manager
   3  *
   4  * Copyright (C) 2003-2005, Evan Battaglia <gtoevan@gmx.net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25 #include "viking.h"
  26
  27 #include "gpx.h"
  28
  29 #include <string.h>
  30 #include <stdlib.h>
  31 #include <stdio.h>
  32 #ifdef HAVE_UNISTD_H
  33 #include <unistd.h>
  34 #endif
  35 #include <glib.h>
  36 #include <glib/gstdio.h>
  37
  38 /* Relax some dependencies */
  39 #if ! GLIB_CHECK_VERSION(2,12,0)
  40 static gboolean return_true (gpointer a, gpointer b, gpointer c) { return TRUE; }
  41 static g_hash_table_remove_all (GHashTable *ght) { g_hash_table_foreach_remove ( ght, (GHRFunc) return_true, FALSE ); }
  42 #endif
  43
  44 #define TEST_BOOLEAN(str) (! ((str)[0] == '\0' || (str)[0] == '0' || (str)[0] == 'n' || (str)[0] == 'N' || (str)[0] == 'f' || (str)[0] == 'F') )
  45 #define VIK_MAGIC "#VIK"
  46 #define GPX_MAGIC "<?xm"
  47 #define VIK_MAGIC_LEN 4
  48
  49 #ifdef WINDOWS
  50 #define FILE_SEP '\\'
  51 #else
  52 #define FILE_SEP '/'
  53 #endif
  54
  55 typedef struct _Stack Stack;
  56
  57 struct _Stack {
  58   Stack *under;
  59   gpointer *data;
  60 };
  61
  62 static void pop(Stack **stack) {
  63   Stack *tmp = (*stack)->under;
  64   g_free ( *stack );
  65   *stack = tmp;
  66 }
  67
  68 static void push(Stack **stack)
  69 {
  70   Stack *tmp = g_malloc ( sizeof ( Stack ) );
  71   tmp->under = *stack;
  72   *stack = tmp;
  73 }
  74
  75 static gboolean check_magic ( FILE *f, const gchar *magic_number )
  76 {
  77   gchar magic[VIK_MAGIC_LEN];
  78   gboolean rv = FALSE;
  79   gint8 i;
  80   if ( fread(magic, 1, sizeof(magic), f) == sizeof(magic) &&
  81       strncmp(magic, magic_number, sizeof(magic)) == 0 )
  82     rv = TRUE;
  83   for ( i = sizeof(magic)-1; i >= 0; i-- ) /* the ol' pushback */
  84     ungetc(magic[i],f);
  85   return rv;
  86 }
  87
  88
  89 static gboolean str_starts_with ( const gchar *haystack, const gchar *needle, guint16 len_needle, gboolean must_be_longer )
  90 {
  91   if ( strlen(haystack) > len_needle - (!must_be_longer) && strncasecmp ( haystack, needle, len_needle ) == 0 )
  92     return TRUE;
  93   return FALSE;
  94 }
  95
  96 static guint16 layer_type_from_string ( const gchar *str )
  97 {
  98   guint8 i;
  99   for ( i = 0; i < VIK_LAYER_NUM_TYPES; i++ )
 100     if ( strcasecmp ( str, vik_layer_get_interface(i)->name ) == 0 )
 101       return i;
 102   return -1;
 103 }
 104
 105 void file_write_layer_param ( FILE *f, const gchar *name, guint8 type, VikLayerParamData data ) {
 106       /* string lists are handled differently. We get a GList (that shouldn't
 107        * be freed) back for get_param and if it is null we shouldn't write
 108        * anything at all (otherwise we'd read in a list with an empty string,
 109        * not an empty string list.
 110        */
 111       if ( type == VIK_LAYER_PARAM_STRING_LIST ) {
 112         if ( data.sl ) {
 113           GList *iter = (GList *)data.sl;
 114           while ( iter ) {
 115             fprintf ( f, "%s=", name );
 116             fprintf ( f, "%s\n", (gchar *)(iter->data) );
 117             iter = iter->next;
 118           }
 119         }
 120       } else {
 121         fprintf ( f, "%s=", name );
 122         switch ( type )
 123         {
 124           case VIK_LAYER_PARAM_DOUBLE: {
 125   //          char buf[15]; /* locale independent */
 126   //          fprintf ( f, "%s\n", (char *) g_dtostr (data.d, buf, sizeof (buf)) ); break;
 127               fprintf ( f, "%f\n", data.d );
 128               break;
 129          }
 130           case VIK_LAYER_PARAM_UINT: fprintf ( f, "%d\n", data.u ); break;
 131           case VIK_LAYER_PARAM_INT: fprintf ( f, "%d\n", data.i ); break;
 132           case VIK_LAYER_PARAM_BOOLEAN: fprintf ( f, "%c\n", data.b ? 't' : 'f' ); break;
 133           case VIK_LAYER_PARAM_STRING: fprintf ( f, "%s\n", data.s ); break;
 134           case VIK_LAYER_PARAM_COLOR: fprintf ( f, "#%.2x%.2x%.2x\n", (int)(data.c.red/256),(int)(data.c.green/256),(int)(data.c.blue/256)); break;
 135         }
 136       }
 137 }
 138
 139 static void write_layer_params_and_data ( VikLayer *l, FILE *f )
 140 {
 141   VikLayerParam *params = vik_layer_get_interface(l->type)->params;
 142   VikLayerFuncGetParam get_param = vik_layer_get_interface(l->type)->get_param;
 143
 144   fprintf ( f, "name=%s\n", l->name ? l->name : "" );
 145   if ( !l->visible )
 146     fprintf ( f, "visible=f\n" );
 147
 148   if ( params && get_param )
 149   {
 150     VikLayerParamData data;
 151     guint16 i, params_count = vik_layer_get_interface(l->type)->params_count;
 152     for ( i = 0; i < params_count; i++ )
 153     {
 154       data = get_param(l,i);
 155       file_write_layer_param(f, params[i].name, params[i].type, data);
 156     }
 157   }
 158   if ( vik_layer_get_interface(l->type)->write_file_data )
 159   {
 160     fprintf ( f, "\n\n~LayerData\n" );
 161     vik_layer_get_interface(l->type)->write_file_data ( l, f );
 162     fprintf ( f, "~EndLayerData\n" );
 163   }
 164   /* foreach param:
 165      write param, and get_value, etc.
 166      then run layer data, and that's it.
 167   */
 168 }
 169
 170 static void file_write ( VikAggregateLayer *top, FILE *f, gpointer vp )
 171 {
 172   Stack *stack = NULL;
 173   VikLayer *current_layer;
 174   struct LatLon ll;
 175   VikViewportDrawMode mode;
 176   gchar *modestring;
 177
 178   push(&stack);
 179   stack->data = (gpointer) vik_aggregate_layer_get_children(VIK_AGGREGATE_LAYER(top));
 180   stack->under = NULL;
 181
 182   /* crazhy CRAZHY */
 183   vik_coord_to_latlon ( vik_viewport_get_center ( VIK_VIEWPORT(vp) ), &ll );
 184
 185   mode = vik_viewport_get_drawmode ( VIK_VIEWPORT(vp) );
 186   switch ( mode ) {
 187     case VIK_VIEWPORT_DRAWMODE_UTM: modestring = "utm"; break;
 188     case VIK_VIEWPORT_DRAWMODE_EXPEDIA: modestring = "expedia"; break;
 189     case VIK_VIEWPORT_DRAWMODE_GOOGLE: modestring = "google"; break;
 190     case VIK_VIEWPORT_DRAWMODE_KH: modestring = "kh"; break;
 191     case VIK_VIEWPORT_DRAWMODE_MERCATOR: modestring = "mercator"; break;
 192     default:
 193       g_critical("Houston, we've had a problem. mode=%d", mode);
 194   }
 195
 196   fprintf ( f, "#VIKING GPS Data file " VIKING_URL "\n\nxmpp=%f\nympp=%f\nlat=%f\nlon=%f\nmode=%s\ncolor=%s\ndrawscale=%s\ndrawcentermark=%s",
 197       vik_viewport_get_xmpp ( VIK_VIEWPORT(vp) ), vik_viewport_get_ympp ( VIK_VIEWPORT(vp) ), ll.lat, ll.lon,
 198       modestring, vik_viewport_get_background_color(VIK_VIEWPORT(vp)),
 199       vik_viewport_get_draw_scale(VIK_VIEWPORT(vp)) ? "t" : "f",
 200       vik_viewport_get_draw_centermark(VIK_VIEWPORT(vp)) ? "t" : "f" );
 201
 202   if ( ! VIK_LAYER(top)->visible )
 203     fprintf ( f, "visible=f\n" );
 204
 205   while (stack && stack->data)
 206   {
 207     current_layer = VIK_LAYER(((GList *)stack->data)->data);
 208     fprintf ( f, "\n~Layer %s\n", vik_layer_get_interface(current_layer->type)->name );
 209     write_layer_params_and_data ( current_layer, f );
 210     if ( current_layer->type == VIK_LAYER_AGGREGATE && !vik_aggregate_layer_is_empty(VIK_AGGREGATE_LAYER(current_layer)) )
 211     {
 212       push(&stack);
 213       stack->data = (gpointer) vik_aggregate_layer_get_children(VIK_AGGREGATE_LAYER(current_layer));
 214     }
 215     else if ( current_layer->type == VIK_LAYER_GPS && !vik_gps_layer_is_empty(VIK_GPS_LAYER(current_layer)) )
 216     {
 217       push(&stack);
 218       stack->data = (gpointer) vik_gps_layer_get_children(VIK_GPS_LAYER(current_layer));
 219     }
 220     else
 221     {
 222       stack->data = (gpointer) ((GList *)stack->data)->next;
 223       fprintf ( f, "~EndLayer\n\n" );
 224       while ( stack && (!stack->data) )
 225       {
 226         pop(&stack);
 227         if ( stack )
 228         {
 229           stack->data = (gpointer) ((GList *)stack->data)->next;
 230           fprintf ( f, "~EndLayer\n\n" );
 231         }
 232       }
 233     }
 234   }
 235 /*
 236   get vikaggregatelayer's children (?)
 237   foreach write ALL params,
 238   then layer data (IF function exists)
 239   then endlayer
 240
 241   impl:
 242   stack of layers (LIST) we are working on
 243   when layer->next == NULL ...
 244   we move on.
 245 */
 246 }
 247
 248 static void string_list_delete ( gpointer key, gpointer l, gpointer user_data )
 249 {
 250   /* 20071021 bugfix */
 251   GList *iter = (GList *) l;
 252   while ( iter ) {
 253     g_free ( iter->data );
 254     iter = iter->next;
 255   }
 256   g_list_free ( (GList *) l );
 257 }
 258
 259 static void string_list_set_param (gint i, GList *list, gpointer *layer_and_vp)
 260 {
 261   VikLayerParamData x;
 262   x.sl = list;
 263   vik_layer_set_param ( VIK_LAYER(layer_and_vp[0]), i, x, layer_and_vp[1] );
 264 }
 265
 266 static void file_read ( VikAggregateLayer *top, FILE *f, VikViewport *vp )
 267 {
 268   Stack *stack;
 269   struct LatLon ll = { 0.0, 0.0 };
 270   gchar buffer[4096];
 271   gchar *line;
 272   guint16 len;
 273   long line_num = 0;
 274
 275   VikLayerParam *params = NULL; /* for current layer, so we don't have to keep on looking up interface */
 276   guint8 params_count = 0;
 277
 278   GHashTable *string_lists = g_hash_table_new(g_direct_hash,g_direct_equal);
 279
 280   push(&stack);
 281   stack->under = NULL;
 282   stack->data = (gpointer) top;
 283
 284   while ( fgets ( buffer, 4096, f ) )
 285   {
 286     line_num++;
 287
 288     line = buffer;
 289     while ( *line == ' ' || *line =='\t' )
 290       line++;
 291
 292     if ( line[0] == '#' )
 293       continue;
 294
 295
 296     len = strlen(line);
 297     if ( len > 0 && line[len-1] == '\n' )
 298       line[--len] = '\0';
 299     if ( len > 0 && line[len-1] == '\r' )
 300       line[--len] = '\0';
 301
 302     if ( len == 0 )
 303       continue;
 304
 305
 306     if ( line[0] == '~' )
 307     {
 308       line++; len--;
 309       if ( *line == '\0' )
 310         continue;
 311       else if ( str_starts_with ( line, "Layer ", 6, TRUE ) )
 312       {
 313         int parent_type = VIK_LAYER(stack->data)->type;
 314         if ( ( ! stack->data ) || ((parent_type != VIK_LAYER_AGGREGATE) && (parent_type != VIK_LAYER_GPS)) )
 315         {
 316           g_warning ( "Line %ld: Layer command inside non-Aggregate Layer (type %d)", line_num, parent_type );
 317           push(&stack); /* inside INVALID layer */
 318           stack->data = NULL;
 319           continue;
 320         }
 321         else
 322         {
 323           gint16 type = layer_type_from_string ( line+6 );
 324           push(&stack);
 325           if ( type == -1 )
 326           {
 327             g_warning ( "Line %ld: Unknown type %s", line_num, line+6 );
 328             stack->data = NULL;
 329           }
 330           else if (parent_type == VIK_LAYER_GPS)
 331           {
 332             stack->data = (gpointer) vik_gps_layer_get_a_child(VIK_GPS_LAYER(stack->under->data));
 333             params = vik_layer_get_interface(type)->params;
 334             params_count = vik_layer_get_interface(type)->params_count;
 335           }
 336           else
 337           {
 338             stack->data = (gpointer) vik_layer_create ( type, vp, NULL, FALSE );
 339             params = vik_layer_get_interface(type)->params;
 340             params_count = vik_layer_get_interface(type)->params_count;
 341           }
 342         }
 343       }
 344       else if ( str_starts_with ( line, "EndLayer", 8, FALSE ) )
 345       {
 346         if ( stack->under == NULL )
 347           g_warning ( "Line %ld: Mismatched ~EndLayer command", line_num );
 348         else
 349         {
 350           /* add any string lists we've accumulated */
 351           gpointer layer_and_vp[2];
 352           layer_and_vp[0] = stack->data;
 353           layer_and_vp[1] = vp;
 354           g_hash_table_foreach ( string_lists, (GHFunc) string_list_set_param, layer_and_vp );
 355           g_hash_table_remove_all ( string_lists );
 356
 357           if ( stack->data && stack->under->data )
 358           {
 359             if (VIK_LAYER(stack->under->data)->type == VIK_LAYER_AGGREGATE) {
 360               vik_aggregate_layer_add_layer ( VIK_AGGREGATE_LAYER(stack->under->data), VIK_LAYER(stack->data) );
 361               vik_layer_post_read ( VIK_LAYER(stack->data), vp, TRUE );
 362             }
 363             else if (VIK_LAYER(stack->under->data)->type == VIK_LAYER_GPS) {
 364               /* TODO: anything else needs to be done here ? */
 365             }
 366             else
 367               g_warning ( "Line %ld: EndLayer command inside non-Aggregate Layer (type %d)", line_num, VIK_LAYER(stack->data)->type );
 368           }
 369           pop(&stack);
 370         }
 371       }
 372       else if ( str_starts_with ( line, "LayerData", 9, FALSE ) )
 373       {
 374         if ( stack->data && vik_layer_get_interface(VIK_LAYER(stack->data)->type)->read_file_data )
 375           vik_layer_get_interface(VIK_LAYER(stack->data)->type)->read_file_data ( VIK_LAYER(stack->data), f );
 376           /* must read until hits ~EndLayerData */
 377
 378         else
 379         { /* simply skip layer data over */
 380           while ( fgets ( buffer, 4096, f ) )
 381           {
 382             line_num++;
 383
 384             line = buffer;
 385
 386             len = strlen(line);
 387             if ( len > 0 && line[len-1] == '\n' )
 388               line[--len] = '\0';
 389             if ( len > 0 && line[len-1] == '\r' )
 390               line[--len] = '\0';
 391             if ( strcasecmp ( line, "~EndLayerData" ) == 0 )
 392               break;
 393           }
 394           continue;
 395         }
 396       }
 397       else
 398       {
 399         g_warning ( "Line %ld: Unknown tilde command", line_num );
 400       }
 401     }
 402     else
 403     {
 404       gint32 eq_pos = -1;
 405       guint16 i;
 406       if ( ! stack->data )
 407         continue;
 408
 409       for ( i = 0; i < len; i++ )
 410         if ( line[i] == '=' )
 411           eq_pos = i;
 412
 413       if ( stack->under == NULL && eq_pos == 4 && strncasecmp ( line, "xmpp", eq_pos ) == 0) /* "hard coded" params: global & for all layer-types */
 414         vik_viewport_set_xmpp ( VIK_VIEWPORT(vp), strtod ( line+5, NULL ) );
 415       else if ( stack->under == NULL && eq_pos == 4 && strncasecmp ( line, "ympp", eq_pos ) == 0)
 416         vik_viewport_set_ympp ( VIK_VIEWPORT(vp), strtod ( line+5, NULL ) );
 417       else if ( stack->under == NULL && eq_pos == 3 && strncasecmp ( line, "lat", eq_pos ) == 0 )
 418         ll.lat = strtod ( line+4, NULL );
 419       else if ( stack->under == NULL && eq_pos == 3 && strncasecmp ( line, "lon", eq_pos ) == 0 )
 420         ll.lon = strtod ( line+4, NULL );
 421       else if ( stack->under == NULL && eq_pos == 4 && strncasecmp ( line, "mode", eq_pos ) == 0 && strcasecmp ( line+5, "utm" ) == 0)
 422         vik_viewport_set_drawmode ( VIK_VIEWPORT(vp), VIK_VIEWPORT_DRAWMODE_UTM);
 423       else if ( stack->under == NULL && eq_pos == 4 && strncasecmp ( line, "mode", eq_pos ) == 0 && strcasecmp ( line+5, "expedia" ) == 0)
 424         vik_viewport_set_drawmode ( VIK_VIEWPORT(vp), VIK_VIEWPORT_DRAWMODE_EXPEDIA );
 425       else if ( stack->under == NULL && eq_pos == 4 && strncasecmp ( line, "mode", eq_pos ) == 0 && strcasecmp ( line+5, "google" ) == 0)
 426         vik_viewport_set_drawmode ( VIK_VIEWPORT(vp), VIK_VIEWPORT_DRAWMODE_GOOGLE );
 427       else if ( stack->under == NULL && eq_pos == 4 && strncasecmp ( line, "mode", eq_pos ) == 0 && strcasecmp ( line+5, "kh" ) == 0)
 428         vik_viewport_set_drawmode ( VIK_VIEWPORT(vp), VIK_VIEWPORT_DRAWMODE_KH );
 429       else if ( stack->under == NULL && eq_pos == 4 && strncasecmp ( line, "mode", eq_pos ) == 0 && strcasecmp ( line+5, "mercator" ) == 0)
 430         vik_viewport_set_drawmode ( VIK_VIEWPORT(vp), VIK_VIEWPORT_DRAWMODE_MERCATOR );
 431       else if ( stack->under == NULL && eq_pos == 5 && strncasecmp ( line, "color", eq_pos ) == 0 )
 432         vik_viewport_set_background_color ( VIK_VIEWPORT(vp), line+6 );
 433       else if ( stack->under == NULL && eq_pos == 9 && strncasecmp ( line, "drawscale", eq_pos ) == 0 )
 434         vik_viewport_set_draw_scale ( VIK_VIEWPORT(vp), TEST_BOOLEAN(line+10) );
 435       else if ( stack->under == NULL && eq_pos == 14 && strncasecmp ( line, "drawcentermark", eq_pos ) == 0 )
 436         vik_viewport_set_draw_centermark ( VIK_VIEWPORT(vp), TEST_BOOLEAN(line+15) );
 437       else if ( stack->under && eq_pos == 4 && strncasecmp ( line, "name", eq_pos ) == 0 )
 438         vik_layer_rename ( VIK_LAYER(stack->data), line+5 );
 439       else if ( eq_pos == 7 && strncasecmp ( line, "visible", eq_pos ) == 0 )
 440         VIK_LAYER(stack->data)->visible = TEST_BOOLEAN(line+8);
 441       else if ( eq_pos != -1 && stack->under )
 442       {
 443         gboolean found_match = FALSE;
 444
 445         /* go thru layer params. if len == eq_pos && starts_with jazz, set it. */
 446         /* also got to check for name and visible. */
 447
 448         if ( ! params )
 449         {
 450           g_warning ( "Line %ld: No options for this kind of layer", line_num );
 451           continue;
 452         }
 453
 454         for ( i = 0; i < params_count; i++ )
 455           if ( strlen(params[i].name) == eq_pos && strncasecmp ( line, params[i].name, eq_pos ) == 0 )
 456           {
 457             VikLayerParamData x;
 458             line += eq_pos+1;
 459             if ( params[i].type == VIK_LAYER_PARAM_STRING_LIST ) {
 460               GList *l = g_list_append ( g_hash_table_lookup ( string_lists, GINT_TO_POINTER ((gint) i) ),
 461                                          g_strdup(line) );
 462               g_hash_table_replace ( string_lists, GINT_TO_POINTER ((gint)i), l );
 463               /* add the value to a list, possibly making a new list.
 464                * this will be passed to the layer when we read an ~EndLayer */
 465             } else {
 466               switch ( params[i].type )
 467               {
 468                 case VIK_LAYER_PARAM_DOUBLE: x.d = strtod(line, NULL); break;
 469                 case VIK_LAYER_PARAM_UINT: x.u = strtoul(line, NULL, 10); break;
 470                 case VIK_LAYER_PARAM_INT: x.i = strtol(line, NULL, 10); break;
 471                 case VIK_LAYER_PARAM_BOOLEAN: x.b = TEST_BOOLEAN(line); break;
 472                 case VIK_LAYER_PARAM_COLOR: memset(&(x.c), 0, sizeof(x.c)); /* default: black */
 473                                           gdk_color_parse ( line, &(x.c) ); break;
 474                 /* STRING or STRING_LIST -- if STRING_LIST, just set param to add a STRING */
 475                 default: x.s = line;
 476               }
 477               vik_layer_set_param ( VIK_LAYER(stack->data), i, x, vp );
 478             }
 479             found_match = TRUE;
 480             break;
 481           }
 482         if ( ! found_match )
 483           g_warning ( "Line %ld: Unknown parameter. Line:\n%s", line_num, line );
 484       }
 485       else
 486         g_warning ( "Line %ld: Invalid parameter or parameter outside of layer.", line_num );
 487     }
 488 /* could be:
 489 [Layer Type=Bla]
 490 [EndLayer]
 491 [LayerData]
 492 name=this
 493 #comment
 494 */
 495   }
 496
 497   while ( stack )
 498   {
 499     if ( stack->under && stack->under->data && stack->data )
 500     {
 501       vik_aggregate_layer_add_layer ( VIK_AGGREGATE_LAYER(stack->under->data), VIK_LAYER(stack->data) );
 502       vik_layer_post_read ( VIK_LAYER(stack->data), vp, TRUE );
 503     }
 504     pop(&stack);
 505   }
 506
 507   if ( ll.lat != 0.0 || ll.lon != 0.0 )
 508     vik_viewport_set_center_latlon ( VIK_VIEWPORT(vp), &ll );
 509
 510   if ( ( ! VIK_LAYER(top)->visible ) && VIK_LAYER(top)->realized )
 511     vik_treeview_item_set_visible ( VIK_LAYER(top)->vt, &(VIK_LAYER(top)->iter), FALSE );
 512
 513   /* delete anything we've forgotten about -- should only happen when file ends before an EndLayer */
 514   g_hash_table_foreach ( string_lists, string_list_delete, NULL );
 515   g_hash_table_destroy ( string_lists );
 516 }
 517
 518 /*
 519 read thru file
 520 if "[Layer Type="
 521   push(&stack)
 522   new default layer of type (str_to_type) (check interface->name)
 523 if "[EndLayer]"
 524   VikLayer *vl = stack->data;
 525   pop(&stack);
 526   vik_aggregate_layer_add_layer(stack->data, vl);
 527 if "[LayerData]"
 528   vik_layer_data ( VIK_LAYER_DATA(stack->data), f, vp );
 529
 530 */
 531
 532 /* ---------------------------------------------------- */
 533
 534 static FILE *xfopen ( const char *fn, const char *mode )
 535 {
 536   if ( strcmp(fn,"-") == 0 )
 537     return stdin;
 538   else
 539     return g_fopen(fn, "r");
 540 }
 541
 542 static void xfclose ( FILE *f )
 543 {
 544   if ( f != stdin && f != stdout ) {
 545     fclose ( f );
 546     f = NULL;
 547   }
 548 }
 549
 550 /* 0 on failure, 1 on success (vik file) 2 on success (other file) */
 551 gshort a_file_load ( VikAggregateLayer *top, VikViewport *vp, const gchar *filename )
 552 {
 553   FILE *f = xfopen ( filename, "r" );
 554
 555   g_assert ( vp );
 556
 557   if ( ! f )
 558     return 0;
 559
 560   if ( check_magic ( f, VIK_MAGIC ) )
 561   {
 562     file_read ( top, f, vp );
 563     if ( f != stdin )
 564       xfclose(f);
 565     return 1;
 566   }
 567   else
 568   {
 569     VikCoord new_center;
 570     VikLayer *vtl = vik_layer_create ( VIK_LAYER_TRW, vp, NULL, FALSE );
 571     vik_layer_rename ( vtl, a_file_basename ( filename ) );
 572
 573     if ( check_magic ( f, GPX_MAGIC ) )
 574       a_gpx_read_file ( VIK_TRW_LAYER(vtl), f );
 575     else
 576      a_gpspoint_read_file ( VIK_TRW_LAYER(vtl), f );
 577
 578     vik_layer_post_read ( vtl, vp, TRUE );
 579
 580     vik_aggregate_layer_add_layer ( top, vtl );
 581
 582     if ( vik_trw_layer_find_center ( VIK_TRW_LAYER(vtl), &new_center ) )
 583       vik_viewport_set_center_coord ( VIK_VIEWPORT(vp), &new_center );
 584     xfclose(f);
 585     return 2;
 586   }
 587 }
 588
 589 gboolean a_file_save ( VikAggregateLayer *top, gpointer vp, const gchar *filename )
 590 {
 591   FILE *f = g_fopen(filename, "w");
 592
 593   if ( ! f )
 594     return FALSE;
 595
 596   file_write ( top, f, vp );
 597
 598   fclose(f);
 599   f = NULL;
 600
 601   return TRUE;
 602 }
 603
 604
 605 const gchar *a_file_basename ( const gchar *filename )
 606 {
 607   const gchar *t = filename + strlen(filename) - 1;
 608   while ( --t > filename )
 609     if ( *(t-1) == FILE_SEP )
 610       break;
 611   if ( t >= filename )
 612     return t;
 613   return filename;
 614 }
 615
 616 gboolean a_file_export ( VikTrwLayer *vtl, const gchar *filename, gshort file_type )
 617 {
 618   FILE *f = g_fopen ( filename, "w" );
 619   if ( f )
 620   {
 621     if ( file_type == FILE_TYPE_GPSMAPPER )
 622       a_gpsmapper_write_file ( vtl, f );
 623     else if ( file_type == FILE_TYPE_GPX )
 624       a_gpx_write_file ( vtl, f );
 625     else
 626       a_gpspoint_write_file ( vtl, f );
 627     fclose ( f );
 628     f = NULL;
 629     return TRUE;
 630   }
 631   return FALSE;
 632 }
 633
 634 const gchar *a_get_viking_dir()
 635 {
 636   static gchar *viking_dir = NULL;
 637
 638   // TODO: use g_get_user_config_dir ?
 639
 640   if (!viking_dir) {
 641     const gchar *home = g_getenv("HOME");
 642     if (!home || g_access(home, W_OK))
 643       home = g_get_home_dir ();
 644 #ifdef HAVE_MKDTEMP
 645     if (!home || g_access(home, W_OK))
 646     {
 647       static gchar temp[] = {"/tmp/vikXXXXXX"};
 648       home = mkdtemp(temp);
 649     }
 650 #endif
 651     if (!home || g_access(home, W_OK))
 652       /* Fatal error */
 653       g_critical("Unable to find a base directory");
 654
 655     /* Build the name of the directory */
 656     viking_dir = g_build_filename(home, ".viking", NULL);
 657     if (g_file_test(viking_dir, G_FILE_TEST_EXISTS) == FALSE)
 658       g_mkdir(viking_dir, 0755);
 659   }
 660
 661   return viking_dir;
 662 }