static LWGEOM*
parse_geojson_geometrycollection(json_object *geojson, bool *hasz, int *root_srid)
{
LWGEOM *geom = NULL;
int i;
json_object* poObjGeoms = NULL;
if (!*root_srid)
{
geom = (LWGEOM *)lwcollection_construct_empty(COLLECTIONTYPE, *root_srid, 1, 0);
}
else
{
geom = (LWGEOM *)lwcollection_construct_empty(COLLECTIONTYPE, -1, 1, 0);
}
poObjGeoms = findMemberByName( geojson, "geometries" );
if ( ! poObjGeoms )
geojson_lwerror("Unable to find 'geometries' in GeoJSON string", 4);
if( json_type_array == json_object_get_type( poObjGeoms ) )
{
const int nGeoms = json_object_array_length( poObjGeoms );
json_object* poObjGeom = NULL;
for(i = 0; i < nGeoms; ++i )
{
poObjGeom = json_object_array_get_idx( poObjGeoms, i );
geom = (LWGEOM*)lwcollection_add_lwgeom((LWCOLLECTION *)geom,
parse_geojson(poObjGeom, hasz, root_srid));
}
}
return geom;
}
Datum geom_from_geojson(PG_FUNCTION_ARGS)
{
#ifndef HAVE_LIBJSON
elog(ERROR, "You need JSON-C for ST_GeomFromGeoJSON");
PG_RETURN_NULL();
#else /* HAVE_LIBJSON */
GSERIALIZED *geom;
LWGEOM *lwgeom;
text *geojson_input;
int geojson_size;
char *geojson;
int root_srid=0;
bool hasz=true;
json_tokener* jstok = NULL;
json_object* poObj = NULL;
json_object* poObjSrs = NULL;
/* Get the geojson stream */
if (PG_ARGISNULL(0)) PG_RETURN_NULL();
geojson_input = PG_GETARG_TEXT_P(0);
geojson = text2cstring(geojson_input);
geojson_size = VARSIZE(geojson_input) - VARHDRSZ;
/* Begin to Parse json */
jstok = json_tokener_new();
poObj = json_tokener_parse_ex(jstok, geojson, -1);
if( jstok->err != json_tokener_success)
{
char err[256];
snprintf(err, 256, "%s (at offset %d)", json_tokener_errors[jstok->err], jstok->char_offset);
json_tokener_free(jstok);
geojson_lwerror(err, 1);
}
json_tokener_free(jstok);
poObjSrs = findMemberByName( poObj, "crs" );
if (poObjSrs != NULL)
{
json_object* poObjSrsType = findMemberByName( poObjSrs, "type" );
if (poObjSrsType != NULL)
{
json_object* poObjSrsProps = findMemberByName( poObjSrs, "properties" );
json_object* poNameURL = findMemberByName( poObjSrsProps, "name" );
const char* pszName = json_object_get_string( poNameURL );
root_srid = getSRIDbySRS(pszName);
POSTGIS_DEBUGF(3, "getSRIDbySRS returned root_srid = %d.", root_srid );
}
}
lwgeom = parse_geojson(poObj, &hasz, &root_srid);
lwgeom_add_bbox(lwgeom);
if (root_srid && lwgeom->srid == -1) lwgeom->srid = root_srid;
if (!hasz)
{
LWGEOM *tmp = lwgeom_force_2d(lwgeom);
lwgeom_free(lwgeom);
lwgeom = tmp;
POSTGIS_DEBUG(2, "geom_from_geojson called.");
}
geom = geometry_serialize(lwgeom);
lwgeom_free(lwgeom);
PG_RETURN_POINTER(geom);
#endif
}
LWGEOM*
lwgeom_from_geojson(const char *geojson, char **srs)
{
#ifndef HAVE_LIBJSON
*srs = NULL;
lwerror("You need JSON-C for lwgeom_from_geojson");
return NULL;
#else /* HAVE_LIBJSON */
/* size_t geojson_size = strlen(geojson); */
LWGEOM *lwgeom;
int hasz=LW_TRUE;
json_tokener* jstok = NULL;
json_object* poObj = NULL;
json_object* poObjSrs = NULL;
*srs = NULL;
/* Begin to Parse json */
jstok = json_tokener_new();
poObj = json_tokener_parse_ex(jstok, geojson, -1);
if( jstok->err != json_tokener_success)
{
char err[256];
snprintf(err, 256, "%s (at offset %d)", json_tokener_error_desc(jstok->err), jstok->char_offset);
json_tokener_free(jstok);
json_object_put(poObj);
geojson_lwerror(err, 1);
return NULL;
}
json_tokener_free(jstok);
poObjSrs = findMemberByName( poObj, "crs" );
if (poObjSrs != NULL)
{
json_object* poObjSrsType = findMemberByName( poObjSrs, "type" );
if (poObjSrsType != NULL)
{
json_object* poObjSrsProps = findMemberByName( poObjSrs, "properties" );
if ( poObjSrsProps )
{
json_object* poNameURL = findMemberByName( poObjSrsProps, "name" );
if ( poNameURL )
{
const char* pszName = json_object_get_string( poNameURL );
if ( pszName )
{
*srs = lwalloc(strlen(pszName) + 1);
strcpy(*srs, pszName);
}
}
}
}
}
lwgeom = parse_geojson(poObj, &hasz, 0);
json_object_put(poObj);
lwgeom_add_bbox(lwgeom);
if (!hasz)
{
LWGEOM *tmp = lwgeom_force_2d(lwgeom);
lwgeom_free(lwgeom);
lwgeom = tmp;
LWDEBUG(2, "geom_from_geojson called.");
}
return lwgeom;
#endif /* HAVE_LIBJSON } */
}
