// It exists mainly as a safety measure, for potential future increases in max buffer size.
var http2bufPools [7]sync.Pool // of *[]byte

func http2bufPoolIndex(size int) int {
	if size <= 16384 {
		return 0
	}
	size -= 1
	bits := bits.Len(uint(size))
	index := bits - 14
	if index >= len(http2bufPools) {
		return len(http2bufPools) - 1
	}