You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: versioninfo.go
    path of file: ./repos/goldfish/vendor/github.com/boombuler/barcode/qr
    
    the code of the file until where you have to start completion: package qr

import "math"

// ErrorCorrectionLevel indicates the amount of "backup data" stored in the QR code
type ErrorCorrectionLevel byte

const (
	// L recovers 7% of data
	L ErrorCorrectionLevel = iota
	// M recovers 15% of data
	M
	// Q recovers 25% of data
	Q
	// H recovers 30% of data
	H
)

func (ecl ErrorCorrectionLevel) String() string {
	switch ecl {
	case L:
		return "L"
	case M:
		return "M"
	case Q:
		return "Q"
	case H:
		return "H"
	}
	return "unknown"
}

type encodingMode b
    
func (vi *versionInfo) alignmentPatternPlacements() []int {
	if vi.Version == 1 {
		return make([]int, 0)
	}

	first := 6
	last := vi.modulWidth() - 7
	space := float64(last - first)
	count := int(math.Ceil(space/28)) + 1

	result := make([]int, count)
	result[0] = first
	result[len(result)-1] = last
	if count > 2 {
		step := int(math.Ceil(float64(last-first) / float64(count-1)))
		if step%2 == 1 {
			frac := float64(last-first) / float64(count-1)
			_, x := math.Modf(frac)
			if x >= 0.5 {
				frac = math.Ceil(frac)
			} else {
				frac = math.Floor(frac)
			}

			if int(frac)%2 == 0 {
				step--
			} else {
				step++
			}
		}

		for i := 1; i <= count-2; i++ {
			result[i] = last - (step * (count - 1 - i))
		}
	}

	return result
}