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[andy/viking.git] / src / file.c

/*
 * viking -- GPS Data and Topo Analyzer, Explorer, and Manager
 *
 * Copyright (C) 2003-2005, Evan Battaglia <gtoevan@gmx.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "viking.h"

#include "gpx.h"

#include <string.h>
#include <stdlib.h>
#include <glib.h>
#include <glib/gstdio.h>

#define TEST_BOOLEAN(str) (! ((str)[0] == '\0' || (str)[0] == '0' || (str)[0] == 'n' || (str)[0] == 'N' || (str)[0] == 'f' || (str)[0] == 'F') )
#define VIK_MAGIC "#VIK"
#define GPX_MAGIC "<?xm"
#define VIK_MAGIC_LEN 4

#ifdef WINDOWS
#define FILE_SEP '\\'
#else
#define FILE_SEP '/'
#endif

typedef struct _Stack Stack;

struct _Stack {
  Stack *under;
  gpointer *data;
};

static void pop(Stack **stack) {
  Stack *tmp = (*stack)->under;
  g_free ( *stack );
  *stack = tmp;
}

static void push(Stack **stack)
{
  Stack *tmp = g_malloc ( sizeof ( Stack ) );
  tmp->under = *stack;
  *stack = tmp;
}

static gboolean check_magic ( FILE *f, const gchar *magic_number )
{
  gchar magic[VIK_MAGIC_LEN];
  gboolean rv = FALSE;
  gint8 i;
  if ( fread(magic, 1, sizeof(magic), f) == sizeof(magic) &&
      strncmp(magic, magic_number, sizeof(magic)) == 0 )
    rv = TRUE;
  for ( i = sizeof(magic)-1; i >= 0; i-- ) /* the ol' pushback */
    ungetc(magic[i],f);
  return rv;
}


static gboolean str_starts_with ( const gchar *haystack, const gchar *needle, guint16 len_needle, gboolean must_be_longer )
{
  if ( strlen(haystack) > len_needle - (!must_be_longer) && strncasecmp ( haystack, needle, len_needle ) == 0 )
    return TRUE;
  return FALSE;
}

static guint16 layer_type_from_string ( const gchar *str )
{
  guint8 i;
  for ( i = 0; i < VIK_LAYER_NUM_TYPES; i++ )
    if ( strcasecmp ( str, vik_layer_get_interface(i)->name ) == 0 )
      return i;
  return -1;
}

static void write_layer_params_and_data ( VikLayer *l, FILE *f )
{
  VikLayerParam *params = vik_layer_get_interface(l->type)->params;
  VikLayerFuncGetParam get_param = vik_layer_get_interface(l->type)->get_param;

  fprintf ( f, "name=%s\n", l->name ? l->name : "" );
  if ( !l->visible )
    fprintf ( f, "visible=f\n" );

  if ( params && get_param )
  {
    VikLayerParamData data;
    guint16 i, params_count = vik_layer_get_interface(l->type)->params_count;
    for ( i = 0; i < params_count; i++ )
    {
      data = get_param(l,i);

      /* string lists are handled differently. We get a GList (that shouldn't
       * be freed) back for get_param and if it is null we shouldn't write
       * anything at all (otherwise we'd read in a list with an empty string,