m = pack_rect(bounds_left, bounds_right, bounds_bottom, bounds_top) + 0.chr + 12.chr + pack_u16(1) + m
m = "FWS" + 6.chr + pack_u32(m.length + 8) + m
m = pack_rect(bounds_left, bounds_right, bounds_bottom, bounds_top) + 0.chr + 12.chr + pack_u16(1) + m
m = "FWS" + 6.chr + pack_u32(m.length + 8) + m