static LWCOLLECTION* lwcollection_from_gserialized_buffer(uint8_t *data_ptr, uint8_t g_flags, size_t *g_size)
{
uint32_t type;
uint8_t *start_ptr = data_ptr;
LWCOLLECTION *collection;
uint32_t ngeoms = 0;
int i = 0;
assert(data_ptr);
type = lw_get_uint32_t(data_ptr);
data_ptr += 4; /* Skip past the type. */
collection = (LWCOLLECTION*)lwalloc(sizeof(LWCOLLECTION));
collection->srid = SRID_UNKNOWN; /* Default */
collection->bbox = NULL;
collection->type = type;
collection->flags = g_flags;
ngeoms = lw_get_uint32_t(data_ptr);
collection->ngeoms = ngeoms; /* Zero => empty geometry */
data_ptr += 4; /* Skip past the ngeoms. */
if ( ngeoms > 0 )
collection->geoms = lwalloc(sizeof(LWGEOM*) * ngeoms);
else
collection->geoms = NULL;
/* Sub-geometries are never de-serialized with boxes (#1254) */
FLAGS_SET_BBOX(g_flags, 0);
for ( i = 0; i < ngeoms; i++ )
{
uint32_t subtype = lw_get_uint32_t(data_ptr);
size_t subsize = 0;
if ( ! lwcollection_allows_subtype(type, subtype) )
{
lwerror("Invalid subtype (%s) for collection type (%s)", lwtype_name(subtype), lwtype_name(type));
lwfree(collection);
return NULL;
}
collection->geoms[i] = lwgeom_from_gserialized_buffer(data_ptr, g_flags, &subsize);
data_ptr += subsize;
}
if ( g_size )
*g_size = data_ptr - start_ptr;
return collection;
}
/**
* Appends geom to the collection managed by col. Does not copy or
* clone, simply takes a reference on the passed geom.
*/
LWCOLLECTION* lwcollection_add_lwgeom(LWCOLLECTION *col, const LWGEOM *geom)
{
int i = 0;
if ( col == NULL || geom == NULL ) return NULL;
if ( col->geoms == NULL && (col->ngeoms || col->maxgeoms) ) {
lwerror("Collection is in inconsistent state. Null memory but non-zero collection counts.");
return NULL;
}
/* Check type compatibility */
if ( ! lwcollection_allows_subtype(col->type, geom->type) ) {
lwerror("%s cannot contain %s element", lwtype_name(col->type), lwtype_name(geom->type));
return NULL;
}
/* In case this is a truly empty, make some initial space */
if ( col->geoms == NULL )
{
col->maxgeoms = 2;
col->ngeoms = 0;
col->geoms = lwalloc(col->maxgeoms * sizeof(LWGEOM*));
}
/* Allocate more space if we need it */
lwcollection_reserve(col, col->ngeoms + 1);
/* Make sure we don't already have a reference to this geom */
/* TODO: drop this check ... */
for ( i = 0; i < col->ngeoms; i++ )
{
if ( col->geoms[i] == geom )
{
LWDEBUGF(4, "Found duplicate geometry in collection %p == %p", col->geoms[i], geom);
return col;
}
}
col->geoms[col->ngeoms] = (LWGEOM*)geom;
col->ngeoms++;
return col;
}
