lwcircstring_from_wkb_state()

static LWCIRCSTRING* lwcircstring_from_wkb_state ( wkb_parse_state *  s )

static

CIRCULARSTRING Read a WKB circularstring, starting just after the endian byte, type number and optional srid number.

Advance the parse state forward appropriately. There is only one pointarray in a linestring. Optionally check for minimal following of rules (three point minimum, odd number of points).

Definition at line 472 of file lwin_wkb.c.

References wkb_parse_state::check, wkb_parse_state::has_m, wkb_parse_state::has_z, LW_PARSER_CHECK_MINPOINTS, LW_PARSER_CHECK_ODD, lwcircstring_construct(), lwcircstring_construct_empty(), lwerror(), wkb_parse_state::lwtype, lwtype_name(), POINTARRAY::npoints, ptarray_from_wkb_state(), and wkb_parse_state::srid.

Referenced by lwgeom_from_wkb_state().

{
        POINTARRAY *pa = ptarray_from_wkb_state(s);

        if( pa == NULL || pa->npoints == 0 )
                return lwcircstring_construct_empty(s->srid, s->has_z, s->has_m);

        if( s->check & LW_PARSER_CHECK_MINPOINTS && pa->npoints < 3 )
        {
                lwerror("%s must have at least three points", lwtype_name(s->lwtype));
                return NULL;
        }

        if( s->check & LW_PARSER_CHECK_ODD && ! (pa->npoints % 2) )
        {
                lwerror("%s must have an odd number of points", lwtype_name(s->lwtype));
                return NULL;
        }

        return lwcircstring_construct(s->srid, NULL, pa);
}

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