}
	return buf, nil
}

// SliceCapWithSize returns the capacity to use when allocating a slice.
// After the slice is allocated with the capacity, it should be
// built using append. This will avoid allocating too much memory
// if the capacity is large and incorrect.
//
// A negative result means that the value is always too big.
func SliceCapWithSize(size, c uint64) int {
	if int64(c) < 0 || c != uint64(int(c)) {

		// of interfaces, there will be buffer reloads.
		errorf("%s slice too big: %d elements of %d bytes", typ.Elem(), u, size)
	}
	if value.Cap() < n {
		safe := saferio.SliceCapWithSize(size, uint64(n))
		if safe < 0 {
			errorf("%s slice too big: %d elements of %d bytes", typ.Elem(), u, size)
		}
		value.Set(reflect.MakeSlice(typ, safe, safe))
	} else {
		value.SetLen(n)
	}