lwgeom_from_twkb()

LWGEOM* lwgeom_from_twkb	(	uint8_t *	twkb,
		size_t	twkb_size,
		char	check
	)

WKB inputs must have a declared size, to prevent malformed WKB from reading off the end of the memory segment (this stops a malevolent user from declaring a one-ring polygon to have 10 rings, causing the WKB reader to walk off the end of the memory).

Parameters

check	parser check flags, see LW_PARSER_CHECK_* macros
size	parser check flags, see LW_PARSER_CHECK_* macros

Check is a bitmask of: LW_PARSER_CHECK_MINPOINTS, LW_PARSER_CHECK_ODD, LW_PARSER_CHECK_CLOSURE, LW_PARSER_CHECK_NONE, LW_PARSER_CHECK_ALL

Definition at line 656 of file lwin_twkb.c.

References twkb_parse_state::check, twkb_parse_state::coords, LW_PARSER_CHECK_NONE, LWDEBUG, LWDEBUGF, lwgeom_from_twkb_state(), twkb_parse_state::pos, s, twkb_parse_state::twkb, twkb_parse_state::twkb_end, and TWKB_IN_MAXCOORDS.

Referenced by cu_twkb_idlist(), cu_twkb_in(), and LWGEOMFromTWKB().

{
        int64_t coords[TWKB_IN_MAXCOORDS] = {0, 0, 0, 0};
        twkb_parse_state s;

        LWDEBUG(2,"Entering lwgeom_from_twkb");
        LWDEBUGF(4,"twkb_size: %d",(int) twkb_size);

        /* Zero out the state */
        memset(&s, 0, sizeof(twkb_parse_state));

        /* Initialize the state appropriately */
        s.twkb = s.pos = twkb;
        s.twkb_end = twkb + twkb_size;
        s.check = check;
        s.coords = coords;

        /* Handle the check catch-all values */
        if ( check & LW_PARSER_CHECK_NONE )
                s.check = 0;
        else
                s.check = check;


        /* Read the rest of the geometry */
        return lwgeom_from_twkb_state(&s);
}

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