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   gchar *modestring;
 176
 177   push(&stack);
 178   stack->data = (gpointer) vik_aggregate_layer_get_children(VIK_AGGREGATE_LAYER(top));
 179   stack->under = NULL;
 180
 181   /* crazhy CRAZHY */
 182   vik_coord_to_latlon ( vik_viewport_get_center ( VIK_VIEWPORT(vp) ), &ll );
 183
 184   switch ( vik_viewport_get_drawmode ( VIK_VIEWPORT(vp) ) ) {
 185     case VIK_VIEWPORT_DRAWMODE_UTM: modestring = "utm"; break;
 186     case VIK_VIEWPORT_DRAWMODE_EXPEDIA: modestring = "expedia"; break;
 187     case VIK_VIEWPORT_DRAWMODE_GOOGLE: modestring = "google"; break;
 188     case VIK_VIEWPORT_DRAWMODE_KH: modestring = "kh"; break;
 189     default: modestring = "mercator";
 190   }
 191
 192   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",
 193       vik_viewport_get_xmpp ( VIK_VIEWPORT(vp) ), vik_viewport_get_ympp ( VIK_VIEWPORT(vp) ), ll.lat, ll.lon,
 194       modestring, vik_viewport_get_background_color(VIK_VIEWPORT(vp)),
 195       vik_viewport_get_draw_scale(VIK_VIEWPORT(vp)) ? "t" : "f",
 196       vik_viewport_get_draw_centermark(VIK_VIEWPORT(vp)) ? "t" : "f" );
 197
 198   if ( ! VIK_LAYER(top)->visible )
 199     fprintf ( f, "visible=f\n" );
 200
 201   while (stack && stack->data)
 202   {
 203     current_layer = VIK_LAYER(((GList *)stack->data)->data);
 204     fprintf ( f, "\n~Layer %s\n", vik_layer_get_interface(current_layer->type)->name );
 205     write_layer_params_and_data ( current_layer, f );
 206     if ( current_layer->type == VIK_LAYER_AGGREGATE && !vik_aggregate_layer_is_empty(VIK_AGGREGATE_LAYER(current_layer)) )
 207     {
 208       push(&stack);
 209       stack->data = (gpointer) vik_aggregate_layer_get_children(VIK_AGGREGATE_LAYER(current_layer));
 210     }
 211     else if ( current_layer->type == VIK_LAYER_GPS && !vik_gps_layer_is_empty(VIK_GPS_LAYER(current_layer)) )
 212     {
 213       push(&stack);
 214       stack->data = (gpointer) vik_gps_layer_get_children(VIK_GPS_LAYER(current_layer));
 215     }
 216     else
 217     {
 218       stack->data = (gpointer) ((GList *)stack->data)->next;
 219       fprintf ( f, "~EndLayer\n\n" );
 220       while ( stack && (!stack->data) )
 221       {
 222         pop(&stack);
 223         if ( stack )
 224         {
 225           stack->data = (gpointer) ((GList *)stack->data)->next;
 226           fprintf ( f, "~EndLayer\n\n" );
 227         }
 228       }
 229     }
 230   }
 231 /*
 232   get vikaggregatelayer's children (?)
 233   foreach write ALL params,
 234   then layer data (IF function exists)
 235   then endlayer
 236
 237   impl:
 238   stack of layers (LIST) we are working on
 239   when layer->next == NULL ...
 240   we move on.
 241 */
 242 }
 243
 244 static void string_list_delete ( gpointer key, gpointer l, gpointer user_data )
 245 {
 246   /* 20071021 bugfix */
 247   GList *iter = (GList *) l;
 248   while ( iter ) {
 249     g_free ( iter->data );
 250     iter = iter->next;
 251   }
 252   g_list_free ( (GList *) l );
 253 }
 254
 255 static void string_list_set_param (gint i, GList *list, gpointer *layer_and_vp)
 256 {
 257   VikLayerParamData x;
 258   x.sl = list;
 259   vik_layer_set_param ( VIK_LAYER(layer_and_vp[0]), i, x, layer_and_vp[1] );
 260 }
 261
 262 static void file_read ( VikAggregateLayer *top, FILE *f, VikViewport *vp )
 263 {
 264   Stack *stack;
 265   struct LatLon ll = { 0.0, 0.0 };
 266   gchar buffer[4096];
 267   gchar *line;
 268   guint16 len;
 269   long line_num = 0;
 270
 271   VikLayerParam *params = NULL; /* for current layer, so we don't have to keep on looking up interface */
 272   guint8 params_count = 0;
 273
 274   GHashTable *string_lists = g_hash_table_new(g_direct_hash,g_direct_equal);
 275
 276   push(&stack);
 277   stack->under = NULL;
 278   stack->data = (gpointer) top;
 279
 280   while ( fgets ( buffer, 4096, f ) )
 281   {
 282     line_num++;
 283
 284     line = buffer;
 285     while ( *line == ' ' || *line =='\t' )
 286       line++;
 287
 288     if ( line[0] == '#' )
 289       continue;
 290
 291
 292     len = strlen(line);
 293     if ( len > 0 && line[len-1] == '\n' )
 294       line[--len] = '\0';
 295     if ( len > 0 && line[len-1] == '\r' )
 296       line[--len] = '\0';
 297
 298     if ( len == 0 )
 299       continue;
 300
 301
 302     if ( line[0] == '~' )
 303     {
 304       line++; len--;
 305       if ( *line == '\0' )
 306         continue;
 307       else if ( str_starts_with ( line, "Layer ", 6, TRUE ) )
 308       {
 309         int parent_type = VIK_LAYER(stack->data)->type;
 310         if ( ( ! stack->data ) || ((parent_type != VIK_LAYER_AGGREGATE) && (parent_type != VIK_LAYER_GPS)) )
 311         {
 312           g_warning ( "Line %ld: Layer command inside non-Aggregate Layer (type %d)", line_num, parent_type );
 313           push(&stack); /* inside INVALID layer */
 314           stack->data = NULL;
 315           continue;
 316         }
 317         else
 318         {
 319           gint16 type = layer_type_from_string ( line+6 );
 320           push(&stack);
 321           if ( type == -1 )
 322           {
 323             g_warning ( "Line %ld: Unknown type %s", line_num, line+6 );
 324             stack->data = NULL;
 325           }
 326           else if (parent_type == VIK_LAYER_GPS)
 327           {
 328             stack->data = (gpointer) vik_gps_layer_get_a_child(VIK_GPS_LAYER(stack->under->data));
 329             params = vik_layer_get_interface(type)->params;
 330             params_count = vik_layer_get_interface(type)->params_count;
 331           }
 332           else
 333           {
 334             stack->data = (gpointer) vik_layer_create ( type, vp, NULL, FALSE );
 335             params = vik_layer_get_interface(type)->params;
 336             params_count = vik_layer_get_interface(type)->params_count;
 337           }
 338         }
 339       }
 340       else if ( str_starts_with ( line, "EndLayer", 8, FALSE ) )
 341       {
 342         if ( stack->under == NULL )
 343           g_warning ( "Line %ld: Mismatched ~EndLayer command", line_num );
 344         else
 345         {
 346           /* add any string lists we've accumulated */
 347           gpointer layer_and_vp[2];
 348           layer_and_vp[0] = stack->data;
 349           layer_and_vp[1] = vp;
 350           g_hash_table_foreach ( string_lists, (GHFunc) string_list_set_param, layer_and_vp );
 351           g_hash_table_remove_all ( string_lists );
 352
 353           if ( stack->data && stack->under->data )
 354           {
 355             if (VIK_LAYER(stack->under->data)->type == VIK_LAYER_AGGREGATE) {
 356               vik_aggregate_layer_add_layer ( VIK_AGGREGATE_LAYER(stack->under->data), VIK_LAYER(stack->data) );
 357               vik_layer_post_read ( VIK_LAYER(stack->data), vp, TRUE );
 358             }
 359             else if (VIK_LAYER(stack->under->data)->type == VIK_LAYER_GPS) {
 360               /* TODO: anything else needs to be done here ? */
 361             }
 362             else
 363               g_warning ( "Line %ld: EndLayer command inside non-Aggregate Layer (type %d)", line_num, VIK_LAYER(stack->data)->type );
 364           }
 365           pop(&stack);
 366         }
 367       }
 368       else if ( str_starts_with ( line, "LayerData", 9, FALSE ) )
 369       {
 370         if ( stack->data && vik_layer_get_interface(VIK_LAYER(stack->data)->type)->read_file_data )
 371           vik_layer_get_interface(VIK_LAYER(stack->data)->type)->read_file_data ( VIK_LAYER(stack->data), f );
 372           /* must read until hits ~EndLayerData */
 373
 374         else
 375         { /* simply skip layer data over */
 376           while ( fgets ( buffer, 4096, f ) )
 377           {
 378             line_num++;
 379
 380             line = buffer;
 381
 382             len = strlen(line);
 383             if ( len > 0 && line[len-1] == '\n' )
 384               line[--len] = '\0';
 385             if ( len > 0 && line[len-1] == '\r' )
 386               line[--len] = '\0';
 387             if ( strcasecmp ( line, "~EndLayerData" ) == 0 )
 388               break;
 389           }
 390           continue;
 391         }
 392       }
 393       else
 394       {
 395         g_warning ( "Line %ld: Unknown tilde command", line_num );
 396       }
 397     }
 398     else
 399     {
 400       gint32 eq_pos = -1;
 401       guint16 i;
 402       if ( ! stack->data )
 403         continue;
 404
 405       for ( i = 0; i < len; i++ )
 406         if ( line[i] == '=' )
 407           eq_pos = i;
 408
 409       if ( stack->under == NULL && eq_pos == 4 && strncasecmp ( line, "xmpp", eq_pos ) == 0) /* "hard coded" params: global & for all layer-types */
 410         vik_viewport_set_xmpp ( VIK_VIEWPORT(vp), strtod ( line+5, NULL ) );
 411       else if ( stack->under == NULL && eq_pos == 4 && strncasecmp ( line, "ympp", eq_pos ) == 0)
 412         vik_viewport_set_ympp ( VIK_VIEWPORT(vp), strtod ( line+5, NULL ) );
 413       else if ( stack->under == NULL && eq_pos == 3 && strncasecmp ( line, "lat", eq_pos ) == 0 )
 414         ll.lat = strtod ( line+4, NULL );
 415       else if ( stack->under == NULL && eq_pos == 3 && strncasecmp ( line, "lon", eq_pos ) == 0 )
 416         ll.lon = strtod ( line+4, NULL );
 417       else if ( stack->under == NULL && eq_pos == 4 && strncasecmp ( line, "mode", eq_pos ) == 0 && strcasecmp ( line+5, "utm" ) == 0)
 418         vik_viewport_set_drawmode ( VIK_VIEWPORT(vp), VIK_VIEWPORT_DRAWMODE_UTM);
 419       else if ( stack->under == NULL && eq_pos == 4 && strncasecmp ( line, "mode", eq_pos ) == 0 && strcasecmp ( line+5, "expedia" ) == 0)
 420         vik_viewport_set_drawmode ( VIK_VIEWPORT(vp), VIK_VIEWPORT_DRAWMODE_EXPEDIA );
 421       else if ( stack->under == NULL && eq_pos == 4 && strncasecmp ( line, "mode", eq_pos ) == 0 && strcasecmp ( line+5, "google" ) == 0)
 422         vik_viewport_set_drawmode ( VIK_VIEWPORT(vp), VIK_VIEWPORT_DRAWMODE_GOOGLE );
 423       else if ( stack->under == NULL && eq_pos == 4 && strncasecmp ( line, "mode", eq_pos ) == 0 && strcasecmp ( line+5, "kh" ) == 0)
 424         vik_viewport_set_drawmode ( VIK_VIEWPORT(vp), VIK_VIEWPORT_DRAWMODE_KH );
 425       else if ( stack->under == NULL && eq_pos == 4 && strncasecmp ( line, "mode", eq_pos ) == 0 && strcasecmp ( line+5, "mercator" ) == 0)
 426         vik_viewport_set_drawmode ( VIK_VIEWPORT(vp), VIK_VIEWPORT_DRAWMODE_MERCATOR );
 427       else if ( stack->under == NULL && eq_pos == 5 && strncasecmp ( line, "color", eq_pos ) == 0 )
 428         vik_viewport_set_background_color ( VIK_VIEWPORT(vp), line+6 );
 429       else if ( stack->under == NULL && eq_pos == 9 && strncasecmp ( line, "drawscale", eq_pos ) == 0 )
 430         vik_viewport_set_draw_scale ( VIK_VIEWPORT(vp), TEST_BOOLEAN(line+10) );
 431       else if ( stack->under == NULL && eq_pos == 14 && strncasecmp ( line, "drawcentermark", eq_pos ) == 0 )
 432         vik_viewport_set_draw_centermark ( VIK_VIEWPORT(vp), TEST_BOOLEAN(line+15) );
 433       else if ( stack->under && eq_pos == 4 && strncasecmp ( line, "name", eq_pos ) == 0 )
 434         vik_layer_rename ( VIK_LAYER(stack->data), line+5 );
 435       else if ( eq_pos == 7 && strncasecmp ( line, "visible", eq_pos ) == 0 )
 436         VIK_LAYER(stack->data)->visible = TEST_BOOLEAN(line+8);
 437       else if ( eq_pos != -1 && stack->under )
 438       {
 439         gboolean found_match = FALSE;
 440
 441         /* go thru layer params. if len == eq_pos && starts_with jazz, set it. */
 442         /* also got to check for name and visible. */
 443
 444         if ( ! params )
 445         {
 446           g_warning ( "Line %ld: No options for this kind of layer", line_num );
 447           continue;
 448         }
 449
 450         for ( i = 0; i < params_count; i++ )
 451           if ( strlen(params[i].name) == eq_pos && strncasecmp ( line, params[i].name, eq_pos ) == 0 )
 452           {
 453             VikLayerParamData x;
 454             line += eq_pos+1;
 455             if ( params[i].type == VIK_LAYER_PARAM_STRING_LIST ) {
 456               GList *l = g_list_append ( g_hash_table_lookup ( string_lists, GINT_TO_POINTER ((gint) i) ),
 457                                          g_strdup(line) );
 458               g_hash_table_replace ( string_lists, GINT_TO_POINTER ((gint)i), l );
 459               /* add the value to a list, possibly making a new list.
 460                * this will be passed to the layer when we read an ~EndLayer */
 461             } else {
 462               switch ( params[i].type )
 463               {
 464                 case VIK_LAYER_PARAM_DOUBLE: x.d = strtod(line, NULL); break;
 465                 case VIK_LAYER_PARAM_UINT: x.u = strtoul(line, NULL, 10); break;
 466                 case VIK_LAYER_PARAM_INT: x.i = strtol(line, NULL, 10); break;
 467                 case VIK_LAYER_PARAM_BOOLEAN: x.b = TEST_BOOLEAN(line); break;
 468                 case VIK_LAYER_PARAM_COLOR: memset(&(x.c), 0, sizeof(x.c)); /* default: black */
 469                                           gdk_color_parse ( line, &(x.c) ); break;
 470                 /* STRING or STRING_LIST -- if STRING_LIST, just set param to add a STRING */
 471                 default: x.s = line;
 472               }
 473               vik_layer_set_param ( VIK_LAYER(stack->data), i, x, vp );
 474             }
 475             found_match = TRUE;
 476             break;
 477           }
 478         if ( ! found_match )
 479           g_warning ( "Line %ld: Unknown parameter. Line:\n%s", line_num, line );
 480       }
 481       else
 482         g_warning ( "Line %ld: Invalid parameter or parameter outside of layer.", line_num );
 483     }
 484 /* could be:
 485 [Layer Type=Bla]
 486 [EndLayer]
 487 [LayerData]
 488 name=this
 489 #comment
 490 */
 491   }
 492
 493   while ( stack )
 494   {
 495     if ( stack->under && stack->under->data && stack->data )
 496     {
 497       vik_aggregate_layer_add_layer ( VIK_AGGREGATE_LAYER(stack->under->data), VIK_LAYER(stack->data) );
 498       vik_layer_post_read ( VIK_LAYER(stack->data), vp, TRUE );
 499     }
 500     pop(&stack);
 501   }
 502
 503   if ( ll.lat != 0.0 || ll.lon != 0.0 )
 504     vik_viewport_set_center_latlon ( VIK_VIEWPORT(vp), &ll );
 505
 506   if ( ( ! VIK_LAYER(top)->visible ) && VIK_LAYER(top)->realized )
 507     vik_treeview_item_set_visible ( VIK_LAYER(top)->vt, &(VIK_LAYER(top)->iter), FALSE );
 508
 509   /* delete anything we've forgotten about -- should only happen when file ends before an EndLayer */
 510   g_hash_table_foreach ( string_lists, string_list_delete, NULL );
 511   g_hash_table_destroy ( string_lists );
 512 }
 513
 514 /*
 515 read thru file
 516 if "[Layer Type="
 517   push(&stack)
 518   new default layer of type (str_to_type) (check interface->name)
 519 if "[EndLayer]"
 520   VikLayer *vl = stack->data;
 521   pop(&stack);
 522   vik_aggregate_layer_add_layer(stack->data, vl);
 523 if "[LayerData]"
 524   vik_layer_data ( VIK_LAYER_DATA(stack->data), f, vp );
 525
 526 */
 527
 528 /* ---------------------------------------------------- */
 529
 530 static FILE *xfopen ( const char *fn, const char *mode )
 531 {
 532   if ( strcmp(fn,"-") == 0 )
 533     return stdin;
 534   else
 535     return g_fopen(fn, "r");
 536 }
 537
 538 static void xfclose ( FILE *f )
 539 {
 540   if ( f != stdin && f != stdout ) {
 541     fclose ( f );
 542     f = NULL;
 543   }
 544 }
 545
 546 /* 0 on failure, 1 on success (vik file) 2 on success (other file) */
 547 gshort a_file_load ( VikAggregateLayer *top, VikViewport *vp, const gchar *filename )
 548 {
 549   FILE *f = xfopen ( filename, "r" );
 550
 551   g_assert ( vp );
 552
 553   if ( ! f )
 554     return 0;
 555
 556   if ( check_magic ( f, VIK_MAGIC ) )
 557   {
 558     file_read ( top, f, vp );
 559     if ( f != stdin )
 560       xfclose(f);
 561     return 1;
 562   }
 563   else
 564   {
 565     VikCoord new_center;
 566     VikLayer *vtl = vik_layer_create ( VIK_LAYER_TRW, vp, NULL, FALSE );
 567     vik_layer_rename ( vtl, a_file_basename ( filename ) );
 568
 569     if ( check_magic ( f, GPX_MAGIC ) )
 570       a_gpx_read_file ( VIK_TRW_LAYER(vtl), f );
 571     else
 572      a_gpspoint_read_file ( VIK_TRW_LAYER(vtl), f );
 573
 574     vik_layer_post_read ( vtl, vp, TRUE );
 575
 576     vik_aggregate_layer_add_layer ( top, vtl );
 577
 578     if ( vik_trw_layer_find_center ( VIK_TRW_LAYER(vtl), &new_center ) )
 579       vik_viewport_set_center_coord ( VIK_VIEWPORT(vp), &new_center );
 580     xfclose(f);
 581     return 2;
 582   }
 583 }
 584
 585 gboolean a_file_save ( VikAggregateLayer *top, gpointer vp, const gchar *filename )
 586 {
 587   FILE *f = g_fopen(filename, "w");
 588
 589   if ( ! f )
 590     return FALSE;
 591
 592   file_write ( top, f, vp );
 593
 594   fclose(f);
 595   f = NULL;
 596
 597   return TRUE;
 598 }
 599
 600
 601 const gchar *a_file_basename ( const gchar *filename )
 602 {
 603   const gchar *t = filename + strlen(filename) - 1;
 604   while ( --t > filename )
 605     if ( *(t-1) == FILE_SEP )
 606       break;
 607   if ( t >= filename )
 608     return t;
 609   return filename;
 610 }
 611
 612 gboolean a_file_export ( VikTrwLayer *vtl, const gchar *filename, gshort file_type )
 613 {
 614   FILE *f = g_fopen ( filename, "w" );
 615   if ( f )
 616   {
 617     if ( file_type == FILE_TYPE_GPSMAPPER )
 618       a_gpsmapper_write_file ( vtl, f );
 619     else if ( file_type == FILE_TYPE_GPX )
 620       a_gpx_write_file ( vtl, f );
 621     else
 622       a_gpspoint_write_file ( vtl, f );
 623     fclose ( f );
 624     f = NULL;
 625     return TRUE;
 626   }
 627   return FALSE;
 628 }
 629
 630 const gchar *a_get_viking_dir()
 631 {
 632   static gchar *viking_dir = NULL;
 633
 634   // TODO: use g_get_user_config_dir ?
 635
 636   if (!viking_dir) {
 637     const gchar *home = g_getenv("HOME");
 638     if (!home || g_access(home, W_OK))
 639       home = g_get_home_dir ();
 640 #ifdef HAVE_MKDTEMP
 641     if (!home || g_access(home, W_OK))
 642     {
 643       static gchar temp[] = {"/tmp/vikXXXXXX"};
 644       home = mkdtemp(temp);
 645     }
 646 #endif
 647     if (!home || g_access(home, W_OK))
 648       /* Fatal error */
 649       g_critical("Unable to find a base directory");
 650
 651     /* Build the name of the directory */
 652     viking_dir = g_build_filename(home, ".viking", NULL);
 653     if (g_file_test(viking_dir, G_FILE_TEST_EXISTS) == FALSE)
 654       g_mkdir(viking_dir, 0755);
 655   }
 656
 657   return viking_dir;
 658 }