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50a14534 EB |
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 | */ | |
4c77d5e0 GB |
21 | #ifdef HAVE_CONFIG_H |
22 | #include "config.h" | |
23 | #endif | |
50a14534 | 24 | |
35462baf QT |
25 | #include <stdlib.h> |
26 | #include <string.h> | |
4c77d5e0 | 27 | #include <glib/gi18n.h> |
50a14534 EB |
28 | #include <gtk/gtk.h> |
29 | #include <math.h> | |
30 | #include <string.h> | |
31 | #include "coords.h" | |
32 | #include "vikcoord.h" | |
33 | #include "mapcoord.h" | |
85611cd9 | 34 | #include "download.h" |
35462baf | 35 | #include "curl_download.h" |
50a14534 EB |
36 | #include "globals.h" |
37 | #include "google.h" | |
cdcaf41c QT |
38 | #include "vikmapslayer.h" |
39 | ||
dad2c114 | 40 | |
94493114 QT |
41 | static int google_download ( MapCoord *src, const gchar *dest_fn ); |
42 | static int google_trans_download ( MapCoord *src, const gchar *dest_fn ); | |
8a920b62 | 43 | static int google_terrain_download ( MapCoord *src, const gchar *dest_fn ); |
94493114 QT |
44 | static int google_kh_download ( MapCoord *src, const gchar *dest_fn ); |
45 | static void google_mapcoord_to_center_coord ( MapCoord *src, VikCoord *dest ); | |
46 | static gboolean google_coord_to_mapcoord ( const VikCoord *src, gdouble xzoom, gdouble yzoom, MapCoord *dest ); | |
47 | ||
1a8143e6 | 48 | static DownloadOptions google_options = { "http://maps.google.com/", 0 }; |
80214df2 | 49 | |
cdcaf41c QT |
50 | void google_init () { |
51 | VikMapsLayer_MapType google_1 = { 7, 256, 256, VIK_VIEWPORT_DRAWMODE_MERCATOR, google_coord_to_mapcoord, google_mapcoord_to_center_coord, google_download }; | |
52 | VikMapsLayer_MapType google_2 = { 10, 256, 256, VIK_VIEWPORT_DRAWMODE_MERCATOR, google_coord_to_mapcoord, google_mapcoord_to_center_coord, google_trans_download }; | |
53 | VikMapsLayer_MapType google_3 = { 11, 256, 256, VIK_VIEWPORT_DRAWMODE_MERCATOR, google_coord_to_mapcoord, google_mapcoord_to_center_coord, google_kh_download }; | |
8a920b62 | 54 | VikMapsLayer_MapType google_4 = { 16, 256, 256, VIK_VIEWPORT_DRAWMODE_MERCATOR, google_coord_to_mapcoord, google_mapcoord_to_center_coord, google_terrain_download }; |
cdcaf41c | 55 | |
4c77d5e0 GB |
56 | maps_layer_register_type(_("Google Maps"), 7, &google_1); |
57 | maps_layer_register_type(_("Transparent Google Maps"), 10, &google_2); | |
58 | maps_layer_register_type(_("Google Satellite Images"), 11, &google_3); | |
59 | maps_layer_register_type(_("Google Terrain Maps"), 16, &google_4); | |
cdcaf41c | 60 | } |
50a14534 EB |
61 | |
62 | /* 1 << (x) is like a 2**(x) */ | |
63 | #define GZ(x) ((1<<x)) | |
64 | ||
65 | 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), | |
66 | GZ(10), GZ(11), GZ(12), GZ(13), GZ(14), GZ(15), GZ(16), GZ(17) }; | |
67 | ||
68 | static const gint num_scales = (sizeof(scale_mpps) / sizeof(scale_mpps[0])); | |
69 | ||
70 | #define ERROR_MARGIN 0.01 | |
71 | guint8 google_zoom ( gdouble mpp ) { | |
72 | gint i; | |
73 | for ( i = 0; i < num_scales; i++ ) { | |
74 | if ( ABS(scale_mpps[i] - mpp) < ERROR_MARGIN ) | |
75 | return i; | |
76 | } | |
77 | return 255; | |
78 | } | |
79 | ||
35462baf QT |
80 | typedef enum { |
81 | TYPE_GOOGLE_MAPS = 0, | |
82 | TYPE_GOOGLE_TRANS, | |
83 | TYPE_GOOGLE_SAT, | |
8a920b62 | 84 | TYPE_GOOGLE_TERRAIN, |
35462baf QT |
85 | |
86 | TYPE_GOOGLE_NUM | |
87 | } GoogleType; | |
88 | ||
89 | static gchar *parse_version_number(gchar *text) | |
90 | { | |
91 | int i; | |
92 | gchar *vers; | |
93 | gchar *s = text; | |
94 | ||
9128a946 | 95 | for (i = 0; (s[i] != '\\') && (i < 8); i++) |
35462baf | 96 | ; |
9128a946 | 97 | if (s[i] != '\\') { |
35462baf QT |
98 | return NULL; |
99 | } | |
100 | ||
101 | return vers = g_strndup(s, i); | |
102 | } | |
103 | ||
104 | static const gchar *google_version_number(MapCoord *mapcoord, GoogleType google_type) | |
105 | { | |
106 | static gboolean first = TRUE; | |
8a920b62 | 107 | static char *vers[] = { "w2.60", "w2t.60", "20", "w2p.60" }; |
35462baf QT |
108 | FILE *tmp_file; |
109 | int tmp_fd; | |
110 | gchar *tmpname; | |
111 | gchar *uri; | |
112 | VikCoord coord; | |
113 | gchar *text, *pat, *beg; | |
114 | GMappedFile *mf; | |
115 | gsize len; | |
8a920b62 | 116 | gchar *gvers, *tvers, *kvers, *terrvers, *tmpvers; |
35462baf | 117 | static DownloadOptions dl_options = { "http://maps.google.com/", 0 }; |
9128a946 EB |
118 | static const char *gvers_pat = "http://mt0.google.com/mt?n\\x3d404\\x26v\\x3d"; |
119 | static const char *kvers_pat = "http://kh0.google.com/kh?n\\x3d404\\x26v\\x3d"; | |
35462baf QT |
120 | |
121 | g_assert(google_type < TYPE_GOOGLE_NUM); | |
122 | ||
123 | if (!first) | |
124 | return (vers[google_type]); | |
125 | ||
126 | ||
127 | first = FALSE; | |
8a920b62 | 128 | gvers = tvers = kvers = terrvers = NULL; |
35462baf | 129 | if ((tmp_fd = g_file_open_tmp ("vikgvers.XXXXXX", &tmpname, NULL)) == -1) { |
4258f4e2 | 130 | g_critical(_("couldn't open temp file %s"), tmpname); |
35462baf QT |
131 | exit(1); |
132 | } | |
133 | ||
134 | google_mapcoord_to_center_coord(mapcoord, &coord); | |
135 | uri = g_strdup_printf("http://maps.google.com/maps?f=q&hl=en&q=%f,%f", coord.north_south, coord.east_west); | |
136 | tmp_file = fdopen(tmp_fd, "r+"); | |
137 | ||
138 | if (curl_download_uri(uri, tmp_file, &dl_options)) { /* error */ | |
4258f4e2 | 139 | g_warning(_("Failed downloading %s"), tmpname); |
35462baf QT |
140 | } else { |
141 | if ((mf = g_mapped_file_new(tmpname, FALSE, NULL)) == NULL) { | |
4258f4e2 | 142 | g_critical(_("couldn't map temp file")); |
35462baf QT |
143 | exit(1); |
144 | } | |
145 | len = g_mapped_file_get_length(mf); | |
146 | text = g_mapped_file_get_contents(mf); | |
147 | ||
148 | if ((beg = g_strstr_len(text, len, "GLoadApi")) == NULL) { | |
4258f4e2 | 149 | g_warning(_("Failed fetching Google numbers (\"GLoadApi\" not found)")); |
35462baf QT |
150 | goto failed; |
151 | } | |
152 | ||
153 | pat = beg; | |
8a920b62 | 154 | while (!gvers || !tvers ||!terrvers) { |
35462baf QT |
155 | if ((pat = g_strstr_len(pat, &text[len] - pat, gvers_pat)) != NULL) { |
156 | pat += strlen(gvers_pat); | |
157 | if ((tmpvers = parse_version_number(pat)) != NULL) { | |
158 | if (strstr(tmpvers, "t.")) | |
159 | tvers = tmpvers; | |
8a920b62 EB |
160 | else if (strstr(tmpvers, "p.")) |
161 | terrvers = tmpvers; | |
35462baf QT |
162 | else |
163 | gvers = tmpvers; | |
164 | } | |
165 | } | |
166 | else | |
167 | break; | |
168 | } | |
169 | ||
170 | if ((pat = g_strstr_len(beg, &text[len] - beg, kvers_pat)) != NULL) | |
171 | kvers = parse_version_number(pat + strlen(kvers_pat)); | |
172 | ||
173 | if (gvers && tvers && kvers) { | |
174 | vers[TYPE_GOOGLE_MAPS] = gvers; | |
175 | vers[TYPE_GOOGLE_TRANS] = tvers; | |
176 | vers[TYPE_GOOGLE_SAT] = kvers; | |
8a920b62 | 177 | vers[TYPE_GOOGLE_TERRAIN] = terrvers; |
35462baf QT |
178 | } |
179 | else | |
4c77d5e0 | 180 | g_warning(_("Failed getting google version numbers")); |
35462baf QT |
181 | |
182 | if (gvers) | |
183 | fprintf(stderr, "DEBUG gvers=%s\n", gvers); | |
184 | if (tvers) | |
185 | fprintf(stderr, "DEBUG tvers=%s\n", tvers); | |
8a920b62 EB |
186 | if (terrvers) |
187 | fprintf(stderr, "DEBUG terrvers=%s\n", terrvers); | |
35462baf QT |
188 | if (kvers) |
189 | fprintf(stderr, "DEBUG kvers=%s\n", kvers); | |
190 | ||
191 | failed: | |
192 | g_mapped_file_free(mf); | |
193 | } | |
194 | ||
195 | fclose(tmp_file); | |
196 | g_free(tmpname); | |
97634600 | 197 | g_free (uri); |
35462baf QT |
198 | return (vers[google_type]); |
199 | } | |
200 | ||
50a14534 EB |
201 | gboolean google_coord_to_mapcoord ( const VikCoord *src, gdouble xzoom, gdouble yzoom, MapCoord *dest ) |
202 | { | |
203 | g_assert ( src->mode == VIK_COORD_LATLON ); | |
204 | ||
205 | if ( xzoom != yzoom ) | |
206 | return FALSE; | |
207 | ||
208 | dest->scale = google_zoom ( xzoom ); | |
209 | if ( dest->scale == 255 ) | |
210 | return FALSE; | |
211 | ||
212 | dest->x = (src->east_west + 180) / 360 * GZ(17) / xzoom; | |
213 | dest->y = (180 - MERCLAT(src->north_south)) / 360 * GZ(17) / xzoom; | |
214 | dest->z = 0; | |
215 | ||
216 | return TRUE; | |
217 | } | |
218 | ||
219 | void google_mapcoord_to_center_coord ( MapCoord *src, VikCoord *dest ) | |
220 | { | |
221 | gdouble socalled_mpp = GZ(src->scale); | |
222 | dest->mode = VIK_COORD_LATLON; | |
223 | dest->east_west = ((src->x+0.5) / GZ(17) * socalled_mpp * 360) - 180; | |
224 | dest->north_south = DEMERCLAT(180 - ((src->y+0.5) / GZ(17) * socalled_mpp * 360)); | |
225 | } | |
226 | ||
94493114 | 227 | static int real_google_download ( MapCoord *src, const gchar *dest_fn, const char *verstr ) |
50a14534 | 228 | { |
94493114 | 229 | int res; |
35462baf | 230 | gchar *uri = g_strdup_printf ( "/mt?n=404&v=%s&x=%d&y=%d&zoom=%d", verstr, src->x, src->y, src->scale ); |
80214df2 | 231 | res = a_http_download_get_url ( "mt.google.com", uri, dest_fn, &google_options ); |
50a14534 | 232 | g_free ( uri ); |
94493114 | 233 | return res; |
50a14534 EB |
234 | } |
235 | ||
94493114 | 236 | static int google_download ( MapCoord *src, const gchar *dest_fn ) |
50a14534 | 237 | { |
35462baf QT |
238 | const gchar *vers_str = google_version_number(src, TYPE_GOOGLE_MAPS); |
239 | return(real_google_download ( src, dest_fn, vers_str )); | |
50a14534 EB |
240 | } |
241 | ||
94493114 | 242 | static int google_trans_download ( MapCoord *src, const gchar *dest_fn ) |
50a14534 | 243 | { |
35462baf QT |
244 | const gchar *vers_str = google_version_number(src, TYPE_GOOGLE_TRANS); |
245 | return(real_google_download ( src, dest_fn, vers_str )); | |
50a14534 EB |
246 | } |
247 | ||
8a920b62 EB |
248 | static int google_terrain_download ( MapCoord *src, const gchar *dest_fn ) |
249 | { | |
250 | const gchar *vers_str = google_version_number(src, TYPE_GOOGLE_TERRAIN); | |
251 | return(real_google_download ( src, dest_fn, vers_str )); | |
252 | } | |
253 | ||
50a14534 EB |
254 | static char *kh_encode(guint32 x, guint32 y, guint8 scale) |
255 | { | |
256 | gchar *buf = g_malloc ( (20-scale)*sizeof(gchar) ); | |
257 | guint32 ya = 1 << (17 - scale); | |
258 | gint8 i, j; | |
259 | ||
260 | if (y < 0 || (ya-1 < y)) { | |
261 | strcpy(buf,"tqq"); /* BAD */ | |
262 | return buf; | |
263 | } | |
264 | if (x < 0 || ya-1 < x) { | |
265 | x %= ya; | |
266 | if (x < 0) | |
267 | x += ya; | |
268 | } | |
269 | ||
270 | buf[0] = 't'; | |
271 | for (j = 1, i = 16; i >= scale; i--, j++) { | |
272 | ya /= 2; | |
273 | if (y < ya) { | |
274 | if (x < ya) | |
275 | buf[j]='q'; | |
276 | else { | |
277 | buf[j]='r'; | |
278 | x -= ya; | |
279 | } | |
280 | } else { | |
281 | if (x < ya) { | |
282 | buf[j] = 't'; | |
283 | y -= ya; | |
284 | } else { | |
285 | buf[j] = 's'; | |
286 | x -= ya; | |
287 | y -= ya; | |
288 | } | |
289 | } | |
290 | } | |
291 | buf[j] = '\0'; | |
292 | return buf; | |
293 | } | |
294 | ||
94493114 | 295 | static int google_kh_download ( MapCoord *src, const gchar *dest_fn ) |
50a14534 | 296 | { |
94493114 | 297 | int res; |
50a14534 | 298 | gchar *khenc = kh_encode( src->x, src->y, src->scale ); |
35462baf QT |
299 | const gchar *vers_str = google_version_number(src, TYPE_GOOGLE_SAT); |
300 | gchar *uri = g_strdup_printf ( "/kh?n=404&v=%s&t=%s", vers_str, khenc ); | |
50a14534 | 301 | g_free ( khenc ); |
80214df2 | 302 | res = a_http_download_get_url ( "kh.google.com", uri, dest_fn, &google_options ); |
50a14534 | 303 | g_free ( uri ); |
94493114 | 304 | return(res); |
50a14534 | 305 | } |