- VikMapsLayer_MapType google_1 = { 7, 256, 256, VIK_VIEWPORT_DRAWMODE_MERCATOR, google_coord_to_mapcoord, google_mapcoord_to_center_coord, google_download };
- VikMapsLayer_MapType google_2 = { 10, 256, 256, VIK_VIEWPORT_DRAWMODE_MERCATOR, google_coord_to_mapcoord, google_mapcoord_to_center_coord, google_trans_download };
- VikMapsLayer_MapType google_3 = { 11, 256, 256, VIK_VIEWPORT_DRAWMODE_MERCATOR, google_coord_to_mapcoord, google_mapcoord_to_center_coord, google_kh_download };
-
- maps_layer_register_type("Google Maps", 7, &google_1);
- maps_layer_register_type("Transparent Google Maps", 10, &google_2);
- maps_layer_register_type("Google Satellite Images", 11, &google_3);
-}
-
-/* 1 << (x) is like a 2**(x) */
-#define GZ(x) ((1<<x))
-
-static const gdouble scale_mpps[] = { GZ(0), GZ(1), GZ(2), GZ(3), GZ(4), GZ(5), GZ(6), GZ(7), GZ(8), GZ(9),
- GZ(10), GZ(11), GZ(12), GZ(13), GZ(14), GZ(15), GZ(16), GZ(17) };
-
-static const gint num_scales = (sizeof(scale_mpps) / sizeof(scale_mpps[0]));
-
-#define ERROR_MARGIN 0.01
-guint8 google_zoom ( gdouble mpp ) {
- gint i;
- for ( i = 0; i < num_scales; i++ ) {
- if ( ABS(scale_mpps[i] - mpp) < ERROR_MARGIN )
- return i;
- }
- return 255;
-}
-
-typedef enum {
- TYPE_GOOGLE_MAPS = 0,
- TYPE_GOOGLE_TRANS,
- TYPE_GOOGLE_SAT,
-
- TYPE_GOOGLE_NUM
-} GoogleType;
-
-static gchar *parse_version_number(gchar *text)
-{
- int i;
- gchar *vers;
- gchar *s = text;
-
- for (i = 0; (s[i] != '&') && (i < 8); i++)
- ;
- if (s[i] != '&') {
- return NULL;
- }
-
- return vers = g_strndup(s, i);
-}
-
-static const gchar *google_version_number(MapCoord *mapcoord, GoogleType google_type)
-{
- static gboolean first = TRUE;
- static char *vers[] = { "w2.60", "w2t.60", "20" };
- FILE *tmp_file;
- int tmp_fd;
- gchar *tmpname;
- gchar *uri;
- VikCoord coord;
- gchar *text, *pat, *beg;
- GMappedFile *mf;
- gsize len;
- gchar *gvers, *tvers, *kvers, *tmpvers;
- static DownloadOptions dl_options = { "http://maps.google.com/", 0 };
- static const char *gvers_pat = "http://mt0.google.com/mt?n=404&v=";
- static const char *kvers_pat = "http://kh0.google.com/kh?n=404&v=";
-
- g_assert(google_type < TYPE_GOOGLE_NUM);
-
- if (!first)
- return (vers[google_type]);
-
-
- first = FALSE;
- gvers = tvers = kvers = NULL;
- if ((tmp_fd = g_file_open_tmp ("vikgvers.XXXXXX", &tmpname, NULL)) == -1) {
- g_critical("couldn't open temp file %s\n", tmpname);
- exit(1);
- }
-
- google_mapcoord_to_center_coord(mapcoord, &coord);
- uri = g_strdup_printf("http://maps.google.com/maps?f=q&hl=en&q=%f,%f", coord.north_south, coord.east_west);
- tmp_file = fdopen(tmp_fd, "r+");
-
- if (curl_download_uri(uri, tmp_file, &dl_options)) { /* error */
- g_warning("Failed downloading %s\n", tmpname);
- } else {
- if ((mf = g_mapped_file_new(tmpname, FALSE, NULL)) == NULL) {
- g_critical("couldn't map temp file\n");
- exit(1);
- }
- len = g_mapped_file_get_length(mf);
- text = g_mapped_file_get_contents(mf);
-
- if ((beg = g_strstr_len(text, len, "GLoadApi")) == NULL) {
- g_warning("Failed fetching Google numbers (\"GLoadApi\" not found)\n");
- goto failed;
- }
-
- pat = beg;
- while (!gvers || !tvers) {
- if ((pat = g_strstr_len(pat, &text[len] - pat, gvers_pat)) != NULL) {
- pat += strlen(gvers_pat);
- if ((tmpvers = parse_version_number(pat)) != NULL) {
- if (strstr(tmpvers, "t."))
- tvers = tmpvers;
- else
- gvers = tmpvers;
- }
- }
- else
- break;
- }
-
- if ((pat = g_strstr_len(beg, &text[len] - beg, kvers_pat)) != NULL)
- kvers = parse_version_number(pat + strlen(kvers_pat));
-
- if (gvers && tvers && kvers) {
- vers[TYPE_GOOGLE_MAPS] = gvers;
- vers[TYPE_GOOGLE_TRANS] = tvers;
- vers[TYPE_GOOGLE_SAT] = kvers;
- }
- else
- g_warning("Failed getting google version numbers");
-
- if (gvers)
- fprintf(stderr, "DEBUG gvers=%s\n", gvers);
- if (tvers)
- fprintf(stderr, "DEBUG tvers=%s\n", tvers);
- if (kvers)
- fprintf(stderr, "DEBUG kvers=%s\n", kvers);
-
-failed:
- g_mapped_file_free(mf);
- }
-
- fclose(tmp_file);
- g_free(tmpname);
- return (vers[google_type]);
-}
-
-gboolean google_coord_to_mapcoord ( const VikCoord *src, gdouble xzoom, gdouble yzoom, MapCoord *dest )
-{
- g_assert ( src->mode == VIK_COORD_LATLON );
-
- if ( xzoom != yzoom )
- return FALSE;
-
- dest->scale = google_zoom ( xzoom );
- if ( dest->scale == 255 )
- return FALSE;
-
- dest->x = (src->east_west + 180) / 360 * GZ(17) / xzoom;
- dest->y = (180 - MERCLAT(src->north_south)) / 360 * GZ(17) / xzoom;
- dest->z = 0;
-
- return TRUE;
-}
-
-void google_mapcoord_to_center_coord ( MapCoord *src, VikCoord *dest )
-{
- gdouble socalled_mpp = GZ(src->scale);
- dest->mode = VIK_COORD_LATLON;
- dest->east_west = ((src->x+0.5) / GZ(17) * socalled_mpp * 360) - 180;
- dest->north_south = DEMERCLAT(180 - ((src->y+0.5) / GZ(17) * socalled_mpp * 360));
-}
-
-static int real_google_download ( MapCoord *src, const gchar *dest_fn, const char *verstr )
-{
- int res;
- gchar *uri = g_strdup_printf ( "/mt?n=404&v=%s&x=%d&y=%d&zoom=%d", verstr, src->x, src->y, src->scale );
- res = a_http_download_get_url ( "mt.google.com", uri, dest_fn, &google_options );
- g_free ( uri );
- return res;
-}
-
-static int google_download ( MapCoord *src, const gchar *dest_fn )
-{
- const gchar *vers_str = google_version_number(src, TYPE_GOOGLE_MAPS);
- return(real_google_download ( src, dest_fn, vers_str ));
-}
-
-static int google_trans_download ( MapCoord *src, const gchar *dest_fn )
-{
- const gchar *vers_str = google_version_number(src, TYPE_GOOGLE_TRANS);
- return(real_google_download ( src, dest_fn, vers_str ));
-}
-
-static char *kh_encode(guint32 x, guint32 y, guint8 scale)
-{
- gchar *buf = g_malloc ( (20-scale)*sizeof(gchar) );
- guint32 ya = 1 << (17 - scale);
- gint8 i, j;
-
- if (y < 0 || (ya-1 < y)) {
- strcpy(buf,"tqq"); /* BAD */
- return buf;
- }
- if (x < 0 || ya-1 < x) {
- x %= ya;
- if (x < 0)
- x += ya;
- }
-
- buf[0] = 't';
- for (j = 1, i = 16; i >= scale; i--, j++) {
- ya /= 2;
- if (y < ya) {
- if (x < ya)
- buf[j]='q';
- else {
- buf[j]='r';
- x -= ya;
- }
- } else {
- if (x < ya) {
- buf[j] = 't';
- y -= ya;
- } else {
- buf[j] = 's';
- x -= ya;
- y -= ya;
- }
- }
- }
- buf[j] = '\0';
- return buf;
-}
-
-static int google_kh_download ( MapCoord *src, const gchar *dest_fn )
-{
- int res;
- gchar *khenc = kh_encode( src->x, src->y, src->scale );
- const gchar *vers_str = google_version_number(src, TYPE_GOOGLE_SAT);
- gchar *uri = g_strdup_printf ( "/kh?n=404&v=%s&t=%s", vers_str, khenc );
- g_free ( khenc );
- res = a_http_download_get_url ( "kh.google.com", uri, dest_fn, &google_options );
- g_free ( uri );
- return(res);
projects / andy / viking.git / blobdiff