sum += delta(r0, r1)
			sum += delta(g0, g1)
			sum += delta(b0, b1)
			n += 3
		}
	}
	return sum / n
}

// lzw.NewWriter wants an interface which is basically the same thing as gif's
// writer interface.  This ensures we're compatible.
var _ writer = blockWriter{}

var testCase = []struct {
	filename  string
	tolerance int64
}{
	{"../testdata/video-001.png", 1 << 12},
	{"../testdata/video-001.gif", 0},

	testGoldenIEEE(t, ChecksumIEEE)

	// Some implementations have special code to deal with misaligned
	// data; test that as well.
	for delta := 1; delta <= 7; delta++ {
		testGoldenIEEE(t, func(b []byte) uint32 {
			ieee := NewIEEE()
			d := delta
			if d >= len(b) {
				d = len(b)
			}
			ieee.Write(b[:d])
			ieee.Write(b[d:])
			return ieee.Sum32()
		})
	}

      ) {
        var index = index
        headerList.add(entry)

        var delta = entry.hpackSize
        if (index != -1) { // Index -1 == new header.
          delta -= dynamicTable[dynamicTableIndex(index)]!!.hpackSize
        }

        // if the new or replacement header is too big, drop all entries.
        if (delta > maxDynamicTableByteCount) {
          clearDynamicTable()
          return
        }

      }

      val expires = this.expires
      if (expires != null) {
        val servedMillis = servedDate?.time ?: receivedResponseMillis
        val delta = expires.time - servedMillis
        return if (delta > 0L) delta else 0L
      }

      if (lastModified != null && cacheResponse.request.url.query == null) {
        // As recommended by the HTTP RFC and implemented in Firefox, the max age of a document

	t.Parallel()
	const Count = 10
	Delta := 100 * Millisecond
	if testing.Short() {
		Delta = 10 * Millisecond
	}
	t0 := Now()
	for i := 0; i < Count; i++ {
		<-After(Delta)
	}
	t1 := Now()
	d := t1.Sub(t0)
	target := Delta * Count
	if d < target*9/10 {
		t.Fatalf("%d ticks of %s too fast: took %s, expected %s", Count, Delta, d, target)
	}
	if !testing.Short() && d > target*30/10 {

	s.mu.Lock()
	defer s.mu.Unlock()
	key := authorizationKey(user)
	expDelta := cacheTTL
	if response == nil {
		// Cache success a bit longer, there is no need to quickly revoke access
		expDelta *= 5
	}
	log.Debugf("cached authorization for user %s: %v", user, response)
	s.authorizationCache[key] = authorizationResponse{
		expiration: time.Now().Add(expDelta),
		authorized: response,
	}
}

		time.Sleep(time.Second)
	}
	rx := float64(globalNetPerfRX.RXSample)
	delta := globalNetPerfRX.firstToDisconnect.Sub(globalNetPerfRX.lastToConnect)
	if delta < 0 {
		rx = 0
		errStr = "network disconnection issues detected"
	}

	globalNetPerfRX.Reset()
	return madmin.NetperfNodeResult{Endpoint: "", TX: r.n / uint64(duration.Seconds()), RX: uint64(rx / delta.Seconds()), Error: errStr}
}

  public long decrementAndGet(K key) {
    return addAndGet(key, -1);
  }

  /**
   * Adds {@code delta} to the value currently associated with {@code key}, and returns the new
   * value.
   */
  @CanIgnoreReturnValue
  public long addAndGet(K key, long delta) {
    return accumulateAndGet(key, delta, Long::sum);
  }

  /**

}

func (r *importReader) posv0() {
	delta := r.int64()
	if delta != deltaNewFile {
		r.prevLine += delta
	} else if l := r.int64(); l == -1 {
		r.prevLine += deltaNewFile
	} else {
		r.prevFile = r.string()
		r.prevLine = l
	}
}

func (r *importReader) posv1() {
	delta := r.int64()
	r.prevColumn += delta >> 1
	if delta&1 != 0 {
		delta = r.int64()
		r.prevLine += delta >> 1

				// another error immediately.
				t.Logf("closing spurious connection from Dial")
				c.Close()

				if delta <= 1 && d.Timeout <= 1 {
					t.Fatalf("can't reduce Timeout or Deadline")
				}
				if delta > 1 {
					delta /= 2
					t.Logf("reducing Deadline delta to %v", delta)
				}
				if d.Timeout > 1 {
					d.Timeout /= 2
					t.Logf("reducing Timeout to %v", d.Timeout)
				}
			}