417 lines
15 KiB
Go
417 lines
15 KiB
Go
// Package qr can be used to create QR barcodes.
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package qr
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import (
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"image"
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"github.com/boombuler/barcode"
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"github.com/boombuler/barcode/utils"
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)
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type encodeFn func(content string, eccLevel ErrorCorrectionLevel) (*utils.BitList, *versionInfo, error)
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// Encoding mode for QR Codes.
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type Encoding byte
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const (
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// Auto will choose ths best matching encoding
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Auto Encoding = iota
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// Numeric encoding only encodes numbers [0-9]
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Numeric
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// AlphaNumeric encoding only encodes uppercase letters, numbers and [Space], $, %, *, +, -, ., /, :
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AlphaNumeric
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// Unicode encoding encodes the string as utf-8
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Unicode
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// only for testing purpose
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unknownEncoding
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)
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func (e Encoding) getEncoder() encodeFn {
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switch e {
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case Auto:
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return encodeAuto
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case Numeric:
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return encodeNumeric
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case AlphaNumeric:
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return encodeAlphaNumeric
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case Unicode:
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return encodeUnicode
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}
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return nil
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}
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func (e Encoding) String() string {
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switch e {
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case Auto:
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return "Auto"
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case Numeric:
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return "Numeric"
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case AlphaNumeric:
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return "AlphaNumeric"
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case Unicode:
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return "Unicode"
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}
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return ""
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}
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// Encode returns a QR barcode with the given content, error correction level and uses the given encoding
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func Encode(content string, level ErrorCorrectionLevel, mode Encoding) (barcode.Barcode, error) {
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bits, vi, err := mode.getEncoder()(content, level)
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if err != nil {
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return nil, err
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}
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blocks := splitToBlocks(bits.IterateBytes(), vi)
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data := blocks.interleave(vi)
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result := render(data, vi)
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result.content = content
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return result, nil
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}
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func render(data []byte, vi *versionInfo) *qrcode {
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dim := vi.modulWidth()
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results := make([]*qrcode, 8)
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for i := 0; i < 8; i++ {
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results[i] = newBarcode(dim)
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}
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occupied := newBarcode(dim)
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setAll := func(x int, y int, val bool) {
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occupied.Set(x, y, true)
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for i := 0; i < 8; i++ {
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results[i].Set(x, y, val)
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}
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}
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drawFinderPatterns(vi, setAll)
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drawAlignmentPatterns(occupied, vi, setAll)
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//Timing Pattern:
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var i int
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for i = 0; i < dim; i++ {
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if !occupied.Get(i, 6) {
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setAll(i, 6, i%2 == 0)
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}
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if !occupied.Get(6, i) {
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setAll(6, i, i%2 == 0)
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}
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}
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// Dark Module
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setAll(8, dim-8, true)
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drawVersionInfo(vi, setAll)
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drawFormatInfo(vi, -1, occupied.Set)
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for i := 0; i < 8; i++ {
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drawFormatInfo(vi, i, results[i].Set)
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}
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// Write the data
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var curBitNo int
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for pos := range iterateModules(occupied) {
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var curBit bool
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if curBitNo < len(data)*8 {
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curBit = ((data[curBitNo/8] >> uint(7-(curBitNo%8))) & 1) == 1
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} else {
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curBit = false
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}
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for i := 0; i < 8; i++ {
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setMasked(pos.X, pos.Y, curBit, i, results[i].Set)
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}
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curBitNo++
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}
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lowestPenalty := ^uint(0)
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lowestPenaltyIdx := -1
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for i := 0; i < 8; i++ {
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p := results[i].calcPenalty()
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if p < lowestPenalty {
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lowestPenalty = p
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lowestPenaltyIdx = i
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}
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}
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return results[lowestPenaltyIdx]
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}
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func setMasked(x, y int, val bool, mask int, set func(int, int, bool)) {
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switch mask {
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case 0:
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val = val != (((y + x) % 2) == 0)
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break
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case 1:
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val = val != ((y % 2) == 0)
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break
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case 2:
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val = val != ((x % 3) == 0)
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break
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case 3:
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val = val != (((y + x) % 3) == 0)
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break
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case 4:
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val = val != (((y/2 + x/3) % 2) == 0)
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break
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case 5:
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val = val != (((y*x)%2)+((y*x)%3) == 0)
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break
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case 6:
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val = val != ((((y*x)%2)+((y*x)%3))%2 == 0)
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break
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case 7:
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val = val != ((((y+x)%2)+((y*x)%3))%2 == 0)
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}
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set(x, y, val)
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}
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func iterateModules(occupied *qrcode) <-chan image.Point {
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result := make(chan image.Point)
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allPoints := make(chan image.Point)
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go func() {
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curX := occupied.dimension - 1
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curY := occupied.dimension - 1
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isUpward := true
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for true {
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if isUpward {
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allPoints <- image.Pt(curX, curY)
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allPoints <- image.Pt(curX-1, curY)
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curY--
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if curY < 0 {
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curY = 0
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curX -= 2
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if curX == 6 {
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curX--
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}
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if curX < 0 {
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break
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}
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isUpward = false
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}
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} else {
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allPoints <- image.Pt(curX, curY)
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allPoints <- image.Pt(curX-1, curY)
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curY++
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if curY >= occupied.dimension {
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curY = occupied.dimension - 1
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curX -= 2
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if curX == 6 {
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curX--
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}
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isUpward = true
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if curX < 0 {
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break
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}
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}
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}
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}
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close(allPoints)
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}()
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go func() {
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for pt := range allPoints {
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if !occupied.Get(pt.X, pt.Y) {
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result <- pt
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}
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}
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close(result)
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}()
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return result
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}
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func drawFinderPatterns(vi *versionInfo, set func(int, int, bool)) {
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dim := vi.modulWidth()
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drawPattern := func(xoff int, yoff int) {
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for x := -1; x < 8; x++ {
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for y := -1; y < 8; y++ {
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val := (x == 0 || x == 6 || y == 0 || y == 6 || (x > 1 && x < 5 && y > 1 && y < 5)) && (x <= 6 && y <= 6 && x >= 0 && y >= 0)
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if x+xoff >= 0 && x+xoff < dim && y+yoff >= 0 && y+yoff < dim {
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set(x+xoff, y+yoff, val)
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}
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}
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}
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}
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drawPattern(0, 0)
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drawPattern(0, dim-7)
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drawPattern(dim-7, 0)
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}
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func drawAlignmentPatterns(occupied *qrcode, vi *versionInfo, set func(int, int, bool)) {
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drawPattern := func(xoff int, yoff int) {
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for x := -2; x <= 2; x++ {
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for y := -2; y <= 2; y++ {
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val := x == -2 || x == 2 || y == -2 || y == 2 || (x == 0 && y == 0)
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set(x+xoff, y+yoff, val)
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}
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}
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}
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positions := vi.alignmentPatternPlacements()
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for _, x := range positions {
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for _, y := range positions {
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if occupied.Get(x, y) {
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continue
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}
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drawPattern(x, y)
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}
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}
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}
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var formatInfos = map[ErrorCorrectionLevel]map[int][]bool{
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L: {
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0: []bool{true, true, true, false, true, true, true, true, true, false, false, false, true, false, false},
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1: []bool{true, true, true, false, false, true, false, true, true, true, true, false, false, true, true},
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2: []bool{true, true, true, true, true, false, true, true, false, true, false, true, false, true, false},
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3: []bool{true, true, true, true, false, false, false, true, false, false, true, true, true, false, true},
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4: []bool{true, true, false, false, true, true, false, false, false, true, false, true, true, true, true},
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5: []bool{true, true, false, false, false, true, true, false, false, false, true, true, false, false, false},
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6: []bool{true, true, false, true, true, false, false, false, true, false, false, false, false, false, true},
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7: []bool{true, true, false, true, false, false, true, false, true, true, true, false, true, true, false},
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},
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M: {
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0: []bool{true, false, true, false, true, false, false, false, false, false, true, false, false, true, false},
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1: []bool{true, false, true, false, false, false, true, false, false, true, false, false, true, false, true},
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2: []bool{true, false, true, true, true, true, false, false, true, true, true, true, true, false, false},
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3: []bool{true, false, true, true, false, true, true, false, true, false, false, true, false, true, true},
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4: []bool{true, false, false, false, true, false, true, true, true, true, true, true, false, false, true},
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5: []bool{true, false, false, false, false, false, false, true, true, false, false, true, true, true, false},
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6: []bool{true, false, false, true, true, true, true, true, false, false, true, false, true, true, true},
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7: []bool{true, false, false, true, false, true, false, true, false, true, false, false, false, false, false},
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},
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Q: {
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0: []bool{false, true, true, false, true, false, true, false, true, false, true, true, true, true, true},
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1: []bool{false, true, true, false, false, false, false, false, true, true, false, true, false, false, false},
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2: []bool{false, true, true, true, true, true, true, false, false, true, true, false, false, false, true},
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3: []bool{false, true, true, true, false, true, false, false, false, false, false, false, true, true, false},
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4: []bool{false, true, false, false, true, false, false, true, false, true, true, false, true, false, false},
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5: []bool{false, true, false, false, false, false, true, true, false, false, false, false, false, true, true},
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6: []bool{false, true, false, true, true, true, false, true, true, false, true, true, false, true, false},
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7: []bool{false, true, false, true, false, true, true, true, true, true, false, true, true, false, true},
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},
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H: {
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0: []bool{false, false, true, false, true, true, false, true, false, false, false, true, false, false, true},
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1: []bool{false, false, true, false, false, true, true, true, false, true, true, true, true, true, false},
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2: []bool{false, false, true, true, true, false, false, true, true, true, false, false, true, true, true},
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3: []bool{false, false, true, true, false, false, true, true, true, false, true, false, false, false, false},
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4: []bool{false, false, false, false, true, true, true, false, true, true, false, false, false, true, false},
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5: []bool{false, false, false, false, false, true, false, false, true, false, true, false, true, false, true},
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6: []bool{false, false, false, true, true, false, true, false, false, false, false, true, true, false, false},
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7: []bool{false, false, false, true, false, false, false, false, false, true, true, true, false, true, true},
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},
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}
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func drawFormatInfo(vi *versionInfo, usedMask int, set func(int, int, bool)) {
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var formatInfo []bool
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if usedMask == -1 {
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formatInfo = []bool{true, true, true, true, true, true, true, true, true, true, true, true, true, true, true} // Set all to true cause -1 --> occupied mask.
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} else {
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formatInfo = formatInfos[vi.Level][usedMask]
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}
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if len(formatInfo) == 15 {
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dim := vi.modulWidth()
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set(0, 8, formatInfo[0])
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set(1, 8, formatInfo[1])
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set(2, 8, formatInfo[2])
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set(3, 8, formatInfo[3])
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set(4, 8, formatInfo[4])
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set(5, 8, formatInfo[5])
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set(7, 8, formatInfo[6])
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set(8, 8, formatInfo[7])
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set(8, 7, formatInfo[8])
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set(8, 5, formatInfo[9])
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set(8, 4, formatInfo[10])
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set(8, 3, formatInfo[11])
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set(8, 2, formatInfo[12])
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set(8, 1, formatInfo[13])
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set(8, 0, formatInfo[14])
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set(8, dim-1, formatInfo[0])
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set(8, dim-2, formatInfo[1])
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set(8, dim-3, formatInfo[2])
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set(8, dim-4, formatInfo[3])
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set(8, dim-5, formatInfo[4])
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set(8, dim-6, formatInfo[5])
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set(8, dim-7, formatInfo[6])
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set(dim-8, 8, formatInfo[7])
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set(dim-7, 8, formatInfo[8])
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set(dim-6, 8, formatInfo[9])
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set(dim-5, 8, formatInfo[10])
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set(dim-4, 8, formatInfo[11])
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set(dim-3, 8, formatInfo[12])
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set(dim-2, 8, formatInfo[13])
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set(dim-1, 8, formatInfo[14])
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}
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}
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var versionInfoBitsByVersion = map[byte][]bool{
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7: []bool{false, false, false, true, true, true, true, true, false, false, true, false, false, true, false, true, false, false},
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8: []bool{false, false, true, false, false, false, false, true, false, true, true, false, true, true, true, true, false, false},
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9: []bool{false, false, true, false, false, true, true, false, true, false, true, false, false, true, true, false, false, true},
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10: []bool{false, false, true, false, true, false, false, true, false, false, true, true, false, true, false, false, true, true},
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11: []bool{false, false, true, false, true, true, true, false, true, true, true, true, true, true, false, true, true, false},
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12: []bool{false, false, true, true, false, false, false, true, true, true, false, true, true, false, false, false, true, false},
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13: []bool{false, false, true, true, false, true, true, false, false, false, false, true, false, false, false, true, true, true},
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14: []bool{false, false, true, true, true, false, false, true, true, false, false, false, false, false, true, true, false, true},
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15: []bool{false, false, true, true, true, true, true, false, false, true, false, false, true, false, true, false, false, false},
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16: []bool{false, true, false, false, false, false, true, false, true, true, false, true, true, true, true, false, false, false},
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17: []bool{false, true, false, false, false, true, false, true, false, false, false, true, false, true, true, true, false, true},
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18: []bool{false, true, false, false, true, false, true, false, true, false, false, false, false, true, false, true, true, true},
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19: []bool{false, true, false, false, true, true, false, true, false, true, false, false, true, true, false, false, true, false},
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20: []bool{false, true, false, true, false, false, true, false, false, true, true, false, true, false, false, true, true, false},
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21: []bool{false, true, false, true, false, true, false, true, true, false, true, false, false, false, false, false, true, true},
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22: []bool{false, true, false, true, true, false, true, false, false, false, true, true, false, false, true, false, false, true},
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23: []bool{false, true, false, true, true, true, false, true, true, true, true, true, true, false, true, true, false, false},
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24: []bool{false, true, true, false, false, false, true, true, true, false, true, true, false, false, false, true, false, false},
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25: []bool{false, true, true, false, false, true, false, false, false, true, true, true, true, false, false, false, false, true},
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26: []bool{false, true, true, false, true, false, true, true, true, true, true, false, true, false, true, false, true, true},
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27: []bool{false, true, true, false, true, true, false, false, false, false, true, false, false, false, true, true, true, false},
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28: []bool{false, true, true, true, false, false, true, true, false, false, false, false, false, true, true, false, true, false},
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29: []bool{false, true, true, true, false, true, false, false, true, true, false, false, true, true, true, true, true, true},
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30: []bool{false, true, true, true, true, false, true, true, false, true, false, true, true, true, false, true, false, true},
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31: []bool{false, true, true, true, true, true, false, false, true, false, false, true, false, true, false, false, false, false},
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32: []bool{true, false, false, false, false, false, true, false, false, true, true, true, false, true, false, true, false, true},
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33: []bool{true, false, false, false, false, true, false, true, true, false, true, true, true, true, false, false, false, false},
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34: []bool{true, false, false, false, true, false, true, false, false, false, true, false, true, true, true, false, true, false},
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35: []bool{true, false, false, false, true, true, false, true, true, true, true, false, false, true, true, true, true, true},
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36: []bool{true, false, false, true, false, false, true, false, true, true, false, false, false, false, true, false, true, true},
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37: []bool{true, false, false, true, false, true, false, true, false, false, false, false, true, false, true, true, true, false},
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38: []bool{true, false, false, true, true, false, true, false, true, false, false, true, true, false, false, true, false, false},
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39: []bool{true, false, false, true, true, true, false, true, false, true, false, true, false, false, false, false, false, true},
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40: []bool{true, false, true, false, false, false, true, true, false, false, false, true, true, false, true, false, false, true},
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}
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func drawVersionInfo(vi *versionInfo, set func(int, int, bool)) {
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versionInfoBits, ok := versionInfoBitsByVersion[vi.Version]
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if ok && len(versionInfoBits) > 0 {
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for i := 0; i < len(versionInfoBits); i++ {
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x := (vi.modulWidth() - 11) + i%3
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y := i / 3
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set(x, y, versionInfoBits[len(versionInfoBits)-i-1])
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set(y, x, versionInfoBits[len(versionInfoBits)-i-1])
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}
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}
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}
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func addPaddingAndTerminator(bl *utils.BitList, vi *versionInfo) {
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for i := 0; i < 4 && bl.Len() < vi.totalDataBytes()*8; i++ {
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bl.AddBit(false)
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}
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for bl.Len()%8 != 0 {
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bl.AddBit(false)
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}
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for i := 0; bl.Len() < vi.totalDataBytes()*8; i++ {
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if i%2 == 0 {
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bl.AddByte(236)
|
|
} else {
|
|
bl.AddByte(17)
|
|
}
|
|
}
|
|
}
|