func (w *writer) hex(start bitgen.Line, n bitgen.Integer, end bitgen.Line) {
if n.Width&(4-1) != 0 {
panic(fmt.Sprintf("invalid hex width: %d", n.Width))
}
for i := n.Width - 4; i < n.Width; i -= 4 {
var next bitgen.Line
if i == 0 {
next = end
} else {
next = w.ReserveLine()
}
w.hexDigit(start, n.Sub(i, i+4), next)
start = next
}
}
