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/*
* osm.c
*
* Copyright (C) 2006-2011 Simon Wunderlich <sw@simonwunderlich.de>
* Copyright (C) 2008-2011 Sven Eckelmann <sven@narfation.org>
*
* This file is part of s3dosm, a gps card application for s3d.
* See http://s3d.berlios.de/ for more updates.
*
* s3dosm 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.
*
* s3dosm 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 s3dosm; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "s3dosm.h"
#include <string.h> /* strcmp() */
#include <stdlib.h> /* strtof(),strtod(),strtol() */
#include <libxml/parser.h>
#include <libxml/tree.h>
#include "http_fetcher.h"
static int layerid;
static int parse_osm_tags(object_t *obj, xmlNodePtr cur)
{
xmlNodePtr c;
xmlAttrPtr attr;
char *v, *k;
v = k = NULL;
for (c = cur->children; c != NULL; c = c->next) {
if (0 == strcmp((char *)c->name, "tag")) {
for (attr = c->properties; attr; attr = attr->next) {
if (0 == strcmp((char *)attr->name, "k")) k = (char *)attr->children->content;
else if (0 == strcmp((char *)attr->name, "v")) v = (char *)attr->children->content;
}
if (k != NULL && v != NULL)
db_add_tag(obj, k, v);
}
}
return 0;
}
static void parse_osm_way(xmlNodePtr cur)
{
way_t way;
xmlNodePtr kids;
xmlAttrPtr attr, kattr;
int nd = 0, last_nd = 0;
segment_t segment;
static int seg = 0;
way_init(&way);
way.base.layerid = layerid;
for (attr = cur->properties; attr; attr = attr->next)
if (0 == strcmp((char *)attr->name, "id")) way.base.id = strtol((char *)attr->children->content, NULL, 10);
db_insert_way_only(&way);
parse_osm_tags(OBJECT_T(&way), cur);
for (kids = cur->children; kids != NULL; kids = kids->next) {
if (0 == strcmp((char *)kids->name, "nd")) {
for (kattr = kids->properties; kattr; kattr = kattr->next)
if (0 == strcmp((char *)kattr->name, "ref")) nd = strtol((char *)kattr->children->content, NULL, 10);
if (last_nd != 0 && nd != 0) {
seg++;
segment_init(&segment);
segment.base.layerid = layerid;
segment.base.id = seg;
segment.from = last_nd;
segment.to = nd;
db_insert_segment(&segment);
parse_osm_tags(OBJECT_T(&segment), cur);
db_insert_way_seg(&way, seg);
}
if (nd != 0) {
last_nd = nd;
}
}
}
}
static void parse_osm_node(xmlNodePtr cur)
{
node_t node;
xmlAttrPtr attr;
node_init(&node);
node.base.layerid = layerid;
for (attr = cur->properties; attr; attr = attr->next) {
if (0 == strcmp((char *)attr->name, "id")) node.base.id = strtol((char *)attr->children->content, NULL, 10);
else if (0 == strcmp((char *)attr->name, "lat")) node.lat = strtod((char *)attr->children->content, NULL);
else if (0 == strcmp((char *)attr->name, "lon")) node.lon = strtod((char *)attr->children->content, NULL);
else if (0 == strcmp((char *)attr->name, "visible")) node.visible = (0 == strcmp((char *)attr->children->content, "true")) ? 1 : 0;
else if (0 == strcmp((char *)attr->name, "time")) {} /* TODO */
}
if (node.base.id > 0) {
db_insert_node(&node);
parse_osm_tags(OBJECT_T(&node), cur);
}
}
/* parse the osm input file */
layer_t *parse_osm(const char *buf, int length)
{
xmlDocPtr doc;
xmlNodePtr cur, c;
layer_t *layer = layer_new();
float n = 0;
int i = 0;
doc = xmlReadMemory(buf, length, "noname.xml", NULL, 0);
if (doc == NULL) {
fprintf(stderr, "Document not parsed successfully.\n");
return NULL;
}
cur = xmlDocGetRootElement(doc);
if (cur == NULL) {
fprintf(stderr, "empty document\n");
xmlFreeDoc(doc);
return NULL;
}
layerid = db_insert_layer("osm");
for (c = cur->children; c != NULL; c = c->next) n++; /* count */
for (cur = cur->children; cur != NULL; cur = cur->next) {
if (cur->type == XML_ELEMENT_NODE) {
if (0 == strcmp((char *)cur->name, "node")) parse_osm_node(cur);
else if (0 == strcmp((char *)cur->name, "way")) parse_osm_way(cur);
}
if ((i++) % 200 == 0) load_update_status(100*((float)i) / n); /* report status */
}
xmlFreeDoc(doc);
db_flush();
return layer;
}
layer_t *load_osm_web(float minlon, float minlat, float maxlon, float maxlat)
{
int ret;
char url[1024];
char *fileBuf; /* Pointer to downloaded data */
layer_t *layer;
snprintf(url, 1024, "www.openstreetmap.org/api/0.6/map?bbox=%f,%f,%f,%f", minlon, minlat, maxlon, maxlat);
printf("downloading url [ %s ]\n", url);
ret = http_fetch(url, &fileBuf); /* Downloads page */
if (ret == -1) {
http_perror("http_fetch");
return NULL;
}
layer = parse_osm(fileBuf, ret);
/* TODO: cleanup http-lib */
free(fileBuf);
return layer;
}
layer_t *load_osm_file(const char *filename)
{
int length;
char *file;
layer_t *ret;
if (NULL == (file = read_file(filename, &length))) return NULL;
ret = parse_osm(file, length);
free(file);
return ret;
}
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