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