// It returns the string as a byte slice, or nil if b is too short to contain the length or
// the full string.
//
//go:nosplit
func gstringb(b []byte) []byte {
	if len(b) < 2 {
		return nil
	}
	n, b := gbit16(b)
	if int(n) > len(b) {
		return nil
	}
	return b[:n]
}

// Offset of the name field in a 9P directory entry - see UnmarshalDir() in dir_plan9.go
const nameOffset = 39

		}

		x16 := uint16(m)
		got16 := RotateLeft16(x16, int(k))
		want16 := x16<<(k&0xf) | x16>>(16-k&0xf)
		if got16 != want16 {
			t.Fatalf("RotateLeft16(%#04x, %d) == %#04x; want %#04x", x16, k, got16, want16)
		}
		got16 = RotateLeft16(want16, -int(k))
		if got16 != x16 {
			t.Fatalf("RotateLeft16(%#04x, -%d) == %#04x; want %#04x", want16, k, got16, x16)
		}

		x32 := uint32(m)

    Random rand = new Random(0);
    int keyBits = 32;
    int hashBits = function.bits();
    for (int bit1 = 0; bit1 < keyBits; bit1++) {
      for (int bit2 = 0; bit2 < keyBits; bit2++) {
        if (bit2 <= bit1) continue;
        int delta = (1 << bit1) | (1 << bit2);
        int[] same = new int[hashBits];
        int[] diff = new int[hashBits];
        // go through trials to compute probability