// 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

    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