}
				code++
				x++
			}
		}

		// Derive minCodes, maxCodes, and valsIndices.
		var c, index int32
		for i, n := range nCodes {
			if n == 0 {
				h.minCodes[i] = -1
				h.maxCodes[i] = -1
				h.valsIndices[i] = -1
			} else {
				h.minCodes[i] = c
				h.maxCodes[i] = c + n - 1
				h.valsIndices[i] = index
				c += n
				index += n
			}
			c <<= 1
		}
	}
	return nil