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barcode
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initial commit

This commit is contained in:
Florian Sundermann 2013-12-11 14:31:11 +01:00
commit bac8bce775
21 changed files with 2189 additions and 0 deletions
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14
barcode.go Normal file
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package barcode
import "image"
type Metadata struct {
CodeKind string
Dimensions byte
}
type Barcode interface {
image.Image
Metadata() Metadata
Content() string
}

110
bitlist.go Normal file
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package barcode
type BitList struct {
count int
data []int32
}
func NewBitList(capacity int) *BitList {
bl := new(BitList)
bl.count = capacity
x := 0
if capacity%32 != 0 {
x = 1
}
bl.data = make([]int32, capacity/32+x)
return bl
}
func (bl *BitList) Len() int {
return bl.count
}
func (bl *BitList) Cap() int {
return len(bl.data) * 32
}
func (bl *BitList) grow() {
growBy := len(bl.data)
if growBy < 128 {
growBy = 128
} else if growBy >= 1024 {
growBy = 1024
}
nd := make([]int32, len(bl.data)+growBy)
copy(nd, bl.data)
bl.data = nd
}
func (bl *BitList) AddBit(bit bool) {
itmIndex := bl.count / 32
for itmIndex >= len(bl.data) {
bl.grow()
}
bl.SetBit(bl.count, bit)
bl.count++
}
func (bl *BitList) SetBit(index int, value bool) {
itmIndex := index / 32
itmBitShift := 31 - (index % 32)
if value {
bl.data[itmIndex] = bl.data[itmIndex] | 1<<uint(itmBitShift)
} else {
bl.data[itmIndex] = bl.data[itmIndex] & ^(1 << uint(itmBitShift))
}
}
func (bl *BitList) GetBit(index int) bool {
itmIndex := index / 32
itmBitShift := 31 - (index % 32)
return ((bl.data[itmIndex] >> uint(itmBitShift)) & 1) == 1
}
func (bl *BitList) AddByte(b byte) {
for i := 7; i >= 0; i-- {
bl.AddBit(((b >> uint(i)) & 1) == 1)
}
}
func (bl *BitList) AddBits(b int, count byte) {
for i := int(count - 1); i >= 0; i-- {
bl.AddBit(((b >> uint(i)) & 1) == 1)
}
}
func (bl *BitList) GetBytes() []byte {
len := bl.count >> 3
if (bl.count % 8) != 0 {
len += 1
}
result := make([]byte, len)
for i := 0; i < len; i++ {
shift := (3 - (i % 4)) * 8
result[i] = (byte)((bl.data[i/4] >> uint(shift)) & 0xFF)
}
return result
}
func (bl *BitList) ItterateBytes() <-chan byte {
res := make(chan byte)
go func() {
c := bl.count
shift := 24
i := 0
for c > 0 {
res <- byte((bl.data[i] >> uint(shift)) & 0xFF)
shift -= 8
if shift < 0 {
shift = 24
i += 1
}
c -= 8
}
close(res)
}()
return res
}

46
ean/eancode.go Normal file
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package ean
import (
"github.com/boombuler/barcode"
"image"
"image/color"
)
type eancode struct {
*barcode.BitList
content string
}
func newEANCode(isEAN8 bool) *eancode {
capacity := 95
if isEAN8 {
capacity = 67
}
return &eancode{barcode.NewBitList(capacity), ""}
}
func (c *eancode) Content() string {
return c.content
}
func (c *eancode) Metadata() barcode.Metadata {
if c.Len() == 67 {
return barcode.Metadata{"EAN 8", 1}
}
return barcode.Metadata{"EAN 13", 1}
}
func (c *eancode) ColorModel() color.Model {
return color.Gray16Model
}
func (c *eancode) Bounds() image.Rectangle {
return image.Rect(0, 0, c.Len(), 1)
}
func (c *eancode) At(x, y int) color.Color {
if c.GetBit(x) {
return color.Black
}
return color.White
}

264
ean/encoder.go Normal file
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package ean
import (
"errors"
"github.com/boombuler/barcode"
)
type encodedNumber struct {
LeftOdd []bool
LeftEven []bool
Right []bool
CheckSum []bool
}
var encoderTable map[rune]encodedNumber = map[rune]encodedNumber{
'0': encodedNumber{
[]bool{false, false, false, true, true, false, true},
[]bool{false, true, false, false, true, true, true},
[]bool{true, true, true, false, false, true, false},
[]bool{false, false, false, false, false, false},
},
'1': encodedNumber{
[]bool{false, false, true, true, false, false, true},
[]bool{false, true, true, false, false, true, true},
[]bool{true, true, false, false, true, true, false},
[]bool{false, false, true, false, true, true},
},
'2': encodedNumber{
[]bool{false, false, true, false, false, true, true},
[]bool{false, false, true, true, false, true, true},
[]bool{true, true, false, true, true, false, false},
[]bool{false, false, true, true, false, true},
},
'3': encodedNumber{
[]bool{false, true, true, true, true, false, true},
[]bool{false, true, false, false, false, false, true},
[]bool{true, false, false, false, false, true, false},
[]bool{false, false, true, true, true, false},
},
'4': encodedNumber{
[]bool{false, true, false, false, false, true, true},
[]bool{false, false, true, true, true, false, true},
[]bool{true, false, true, true, true, false, false},
[]bool{false, true, false, false, true, true},
},
'5': encodedNumber{
[]bool{false, true, true, false, false, false, true},
[]bool{false, true, true, true, false, false, true},
[]bool{true, false, false, true, true, true, false},
[]bool{false, true, true, false, false, true},
},
'6': encodedNumber{
[]bool{false, true, false, true, true, true, true},
[]bool{false, false, false, false, true, false, true},
[]bool{true, false, true, false, false, false, false},
[]bool{false, true, true, true, false, false},
},
'7': encodedNumber{
[]bool{false, true, true, true, false, true, true},
[]bool{false, false, true, false, false, false, true},
[]bool{true, false, false, false, true, false, false},
[]bool{false, true, false, true, false, true},
},
'8': encodedNumber{
[]bool{false, true, true, false, true, true, true},
[]bool{false, false, false, true, false, false, true},
[]bool{true, false, false, true, false, false, false},
[]bool{false, true, false, true, true, false},
},
'9': encodedNumber{
[]bool{false, false, false, true, false, true, true},
[]bool{false, false, true, false, true, true, true},
[]bool{true, true, true, false, true, false, false},
[]bool{false, true, true, false, true, false},
},
}
func runeToInt(r rune) int {
switch r {
case '0':
return 0
case '1':
return 1
case '2':
return 2
case '3':
return 3
case '4':
return 4
case '5':
return 5
case '6':
return 6
case '7':
return 7
case '8':
return 8
case '9':
return 9
}
return -1
}
func intToRune(i int) rune {
switch i {
case 0:
return '0'
case 1:
return '1'
case 2:
return '2'
case 3:
return '3'
case 4:
return '4'
case 5:
return '5'
case 6:
return '6'
case 7:
return '7'
case 8:
return '8'
case 9:
return '9'
}
return 'F'
}
func calcCheckNum(code string) rune {
x3 := len(code) == 7
sum := 0
for _, r := range code {
curNum := runeToInt(r)
if curNum < 0 || curNum > 9 {
return 'B'
}
if x3 {
curNum = curNum * 3
}
x3 = !x3
sum += curNum
}
return intToRune((10 - (sum % 10)) % 10)
}
func encodeEAN8(code string, result *eancode) bool {
pos := 0
appendBit := func(b bool) {
result.SetBit(pos, b)
pos++
}
appendBit(true)
appendBit(false)
appendBit(true)
for cpos, r := range code {
num, ok := encoderTable[r]
if !ok {
return false
}
var data []bool
if cpos < 4 {
data = num.LeftOdd
} else {
data = num.Right
}
if cpos == 4 {
appendBit(false)
appendBit(true)
appendBit(false)
appendBit(true)
appendBit(false)
}
for _, bit := range data {
appendBit(bit)
}
}
appendBit(true)
appendBit(false)
appendBit(true)
return true
}
func encodeEAN13(code string, result *eancode) bool {
pos := 0
appendBit := func(b bool) {
result.SetBit(pos, b)
pos++
}
appendBit(true)
appendBit(false)
appendBit(true)
var firstNum []bool
for cpos, r := range code {
num, ok := encoderTable[r]
if !ok {
return false
}
if cpos == 0 {
firstNum = num.CheckSum
continue
}
var data []bool
if cpos < 7 { // Left
if firstNum[cpos-1] {
data = num.LeftEven
} else {
data = num.LeftOdd
}
} else {
data = num.Right
}
if cpos == 7 {
appendBit(false)
appendBit(true)
appendBit(false)
appendBit(true)
appendBit(false)
}
for _, bit := range data {
appendBit(bit)
}
}
appendBit(true)
appendBit(false)
appendBit(true)
return true
}
func Encode(code string) (barcode.Barcode, error) {
if len(code) == 7 || len(code) == 12 {
code += string(calcCheckNum(code))
} else if len(code) == 8 || len(code) == 13 {
check := code[0 : len(code)-1]
check += string(calcCheckNum(check))
if check != code {
return nil, errors.New("checksum missmatch!")
}
}
ean8 := false
if len(code) == 8 {
ean8 = true
} else if len(code) != 13 {
return nil, errors.New("invalid ean code data")
}
result := newEANCode(ean8)
if (ean8 && encodeEAN8(code, result)) || (!ean8 && encodeEAN13(code, result)) {
result.content = code
return result, nil
}
return nil, errors.New("ean code contains invalid characters")
}

61
qr/alphanumeric.go Normal file
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package qr
import (
"errors"
"fmt"
"github.com/boombuler/barcode"
)
type alphaNumericEncoding struct {
}
var AlphaNumeric Encoding = alphaNumericEncoding{}
var alphaNumericTable map[byte]int = map[byte]int{
'0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9,
'A': 10, 'B': 11, 'C': 12, 'D': 13, 'E': 14, 'F': 15, 'G': 16, 'H': 17, 'I': 18, 'J': 19,
'K': 20, 'L': 21, 'M': 22, 'N': 23, 'O': 24, 'P': 25, 'Q': 26, 'R': 27, 'S': 28, 'T': 29,
'U': 30, 'V': 31, 'W': 32, 'X': 33, 'Y': 34, 'Z': 35, ' ': 36, '$': 37, '%': 38, '*': 39,
'+': 40, '-': 41, '.': 42, '/': 43, ':': 44,
}
func (ane alphaNumericEncoding) String() string {
return "AlphaNumeric"
}
func (ane alphaNumericEncoding) encode(content string, ecl ErrorCorrectionLevel) (*barcode.BitList, *versionInfo, error) {
contentLenIsOdd := len(content)%2 == 1
contentBitCount := (len(content) / 2) * 11
if contentLenIsOdd {
contentBitCount += 6
}
vi := findSmallestVersionInfo(ecl, alphaNumericMode, contentBitCount)
if vi == nil {
return nil, nil, errors.New("To much data to encode")
}
res := new(barcode.BitList)
res.AddBits(int(alphaNumericMode), 4)
res.AddBits(len(content), vi.charCountBits(alphaNumericMode))
for idx := 0; idx < len(content)/2; idx++ {
c1, ok1 := alphaNumericTable[content[idx*2]]
c2, ok2 := alphaNumericTable[content[(idx*2)+1]]
if !ok1 || !ok2 {
return nil, nil, fmt.Errorf("\"%s\" can not be encoded as %s", content, ane)
}
res.AddBits(c1*45+c2, 11)
}
if contentLenIsOdd {
c1, ok := alphaNumericTable[content[len(content)-1]]
if !ok {
return nil, nil, fmt.Errorf("\"%s\" can not be encoded as %s", content, ane)
}
res.AddBits(c1, 6)
}
addPaddingAndTerminator(res, vi)
return res, vi, nil
}

42
qr/alphanumeric_test.go Normal file
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package qr
import (
"bytes"
"testing"
)
func makeString(length int) string {
res := ""
for i := 0; i < length; i++ {
res += "A"
}
return res
}
func Test_AlphaNumericEncoding(t *testing.T) {
x, vi, err := AlphaNumeric.encode("HELLO WORLD", M)
if x == nil || vi == nil || vi.Version != 1 || bytes.Compare(x.GetBytes(), []byte{32, 91, 11, 120, 209, 114, 220, 77, 67, 64, 236, 17, 236, 17, 236, 17}) != 0 {
t.Errorf("\"HELLO WORLD\" failed to encode: %s", err)
}
x, vi, err = AlphaNumeric.encode(makeString(4296), L)
if x == nil || vi == nil || err != nil {
t.Fail()
}
x, vi, err = AlphaNumeric.encode(makeString(4297), L)
if x != nil || vi != nil || err == nil {
t.Fail()
}
x, vi, err = AlphaNumeric.encode("ABc", L)
if x != nil || vi != nil || err == nil {
t.Fail()
}
x, vi, err = AlphaNumeric.encode("hello world", M)
if x != nil || vi != nil || err == nil {
t.Error("\"hello world\" should not be encodable in alphanumeric mode")
}
}

29
qr/automatic.go Normal file
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package qr
import (
"fmt"
"github.com/boombuler/barcode"
)
type autoEncoding struct {
}
// choose the best matching encoding
var Auto Encoding = autoEncoding{}
func (ne autoEncoding) String() string {
return "Auto"
}
func (ne autoEncoding) encode(content string, ecl ErrorCorrectionLevel) (*barcode.BitList, *versionInfo, error) {
bits, vi, _ := Numeric.encode(content, ecl)
if bits != nil && vi != nil {
return bits, vi, nil
}
bits, vi, _ = AlphaNumeric.encode(content, ecl)
if bits != nil && vi != nil {
return bits, vi, nil
}
return nil, nil, fmt.Errorf("No encoding found to encode \"%s\"", content)
}

29
qr/automatic_test.go Normal file
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package qr
import (
"bytes"
"testing"
)
func Test_AutomaticEncoding(t *testing.T) {
tests := map[string]Encoding{
"0123456789": Numeric,
"ALPHA NUMERIC": AlphaNumeric,
"no matching encoing": nil,
}
for str, enc := range tests {
testValue, _, _ := Auto.encode(str, M)
if enc != nil {
correctValue, _, _ := enc.encode(str, M)
if testValue == nil || bytes.Compare(correctValue.GetBytes(), testValue.GetBytes()) != 0 {
t.Errorf("wrong encoding used for '%s'", str)
}
} else {
if testValue != nil {
t.Errorf("wrong encoding used for '%s'", str)
}
}
}
}

59
qr/blocks.go Normal file
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package qr
type block struct {
data []byte
ecc []byte
}
type blockList []*block
func splitToBlocks(data <-chan byte, vi *versionInfo) blockList {
result := make(blockList, vi.NumberOfBlocksInGroup1+vi.NumberOfBlocksInGroup2)
for b := 0; b < int(vi.NumberOfBlocksInGroup1); b++ {
blk := new(block)
blk.data = make([]byte, vi.DataCodeWordsPerBlockInGroup1)
for cw := 0; cw < int(vi.DataCodeWordsPerBlockInGroup1); cw++ {
blk.data[cw] = <-data
}
blk.ecc = gf.calcECC(blk.data, vi.ErrorCorrectionCodewordsPerBlock)
result[b] = blk
}
for b := 0; b < int(vi.NumberOfBlocksInGroup2); b++ {
blk := new(block)
blk.data = make([]byte, vi.DataCodeWordsPerBlockInGroup2)
for cw := 0; cw < int(vi.DataCodeWordsPerBlockInGroup2); cw++ {
blk.data[cw] = <-data
}
blk.ecc = gf.calcECC(blk.data, vi.ErrorCorrectionCodewordsPerBlock)
result[int(vi.NumberOfBlocksInGroup1)+b] = blk
}
return result
}
func (bl blockList) interleave(vi *versionInfo) []byte {
var maxCodewordCount int
if vi.DataCodeWordsPerBlockInGroup1 > vi.DataCodeWordsPerBlockInGroup2 {
maxCodewordCount = int(vi.DataCodeWordsPerBlockInGroup1)
} else {
maxCodewordCount = int(vi.DataCodeWordsPerBlockInGroup2)
}
resultLen := (vi.DataCodeWordsPerBlockInGroup1+vi.ErrorCorrectionCodewordsPerBlock)*vi.NumberOfBlocksInGroup1 +
(vi.DataCodeWordsPerBlockInGroup2+vi.ErrorCorrectionCodewordsPerBlock)*vi.NumberOfBlocksInGroup2
result := make([]byte, 0, resultLen)
for i := 0; i < maxCodewordCount; i++ {
for b := 0; b < len(bl); b++ {
if len(bl[b].data) > i {
result = append(result, bl[b].data[i])
}
}
}
for i := 0; i < int(vi.ErrorCorrectionCodewordsPerBlock); i++ {
for b := 0; b < len(bl); b++ {
result = append(result, bl[b].ecc[i])
}
}
return result
}

22
qr/blocks_test.go Normal file
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package qr
import (
"bytes"
"testing"
)
func Test_Blocks(t *testing.T) {
byteIt := make(chan byte)
go func() {
for _, b := range []byte{67, 85, 70, 134, 87, 38, 85, 194, 119, 50, 6, 18, 6, 103, 38, 246, 246, 66, 7, 118, 134, 242, 7, 38, 86, 22, 198, 199, 146, 6, 182, 230, 247, 119, 50, 7, 118, 134, 87, 38, 82, 6, 134, 151, 50, 7, 70, 247, 118, 86, 194, 6, 151, 50, 16, 236, 17, 236, 17, 236, 17, 236} {
byteIt <- b
}
close(byteIt)
}()
vi := &versionInfo{5, Q, 18, 2, 15, 2, 16}
data := splitToBlocks(byteIt, vi).interleave(vi)
if bytes.Compare(data, []byte{67, 246, 182, 70, 85, 246, 230, 247, 70, 66, 247, 118, 134, 7, 119, 86, 87, 118, 50, 194, 38, 134, 7, 6, 85, 242, 118, 151, 194, 7, 134, 50, 119, 38, 87, 16, 50, 86, 38, 236, 6, 22, 82, 17, 18, 198, 6, 236, 6, 199, 134, 17, 103, 146, 151, 236, 38, 6, 50, 17, 7, 236, 213, 87, 148, 235, 199, 204, 116, 159, 11, 96, 177, 5, 45, 60, 212, 173, 115, 202, 76, 24, 247, 182, 133, 147, 241, 124, 75, 59, 223, 157, 242, 33, 229, 200, 238, 106, 248, 134, 76, 40, 154, 27, 195, 255, 117, 129, 230, 172, 154, 209, 189, 82, 111, 17, 10, 2, 86, 163, 108, 131, 161, 163, 240, 32, 111, 120, 192, 178, 39, 133, 141, 236}) != 0 {
t.Fail()
}
}

508
qr/encoder.go Normal file
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package qr
import (
"fmt"
"github.com/boombuler/barcode"
"image"
)
type Encoding interface {
fmt.Stringer
encode(content string, eccLevel ErrorCorrectionLevel) (*barcode.BitList, *versionInfo, error)
}
func Encode(content string, eccLevel ErrorCorrectionLevel, mode Encoding) (barcode.Barcode, error) {
bits, vi, err := mode.encode(content, eccLevel)
if err != nil {
return nil, err
}
if bits == nil || vi == nil {
return nil, fmt.Errorf("Unable to encode \"%s\" with error correction level %s and encoding mode %s", content, eccLevel, mode)
}
blocks := splitToBlocks(bits.ItterateBytes(), vi)
data := blocks.interleave(vi)
result := render(data, vi)
result.content = content
return result, nil
}
func render(data []byte, vi *versionInfo) *qrcode {
dim := vi.modulWidth()
results := make([]*qrcode, 8)
for i := 0; i < 8; i++ {
results[i] = newBarcode(dim)
}
occupied := newBarcode(dim)
setAll := func(x int, y int, val bool) {
occupied.Set(x, y, true)
for i := 0; i < 8; i++ {
results[i].Set(x, y, val)
}
}
drawFinderPatterns(vi, setAll)
drawAlignmentPatterns(occupied, vi, setAll)
//Timing Pattern:
var i int
for i = 0; i < dim; i++ {
if !occupied.Get(i, 6) {
setAll(i, 6, i%2 == 0)
}
if !occupied.Get(6, i) {
setAll(6, i, i%2 == 0)
}
}
// Dark Module
setAll(8, dim-8, true)
drawVersionInfo(vi, setAll)
drawFormatInfo(vi, -1, occupied.Set)
for i := 0; i < 8; i++ {
drawFormatInfo(vi, i, results[i].Set)
}
// Write the data
var curBitNo int = 0
for pos := range itterateModules(occupied) {
if curBitNo < len(data)*8 {
curBit := ((data[curBitNo/8] >> uint(7-(curBitNo%8))) & 1) == 1
for i := 0; i < 8; i++ {
setMasked(pos.X, pos.Y, curBit, i, results[i].Set)
}
curBitNo += 1
}
}
lowestPenalty := ^uint(0)
lowestPenaltyIdx := -1
for i := 0; i < 8; i++ {
p := results[i].calcPenalty()
if p < lowestPenalty {
lowestPenalty = p
lowestPenaltyIdx = i
}
}
return results[lowestPenaltyIdx]
}
func setMasked(x, y int, val bool, mask int, set func(int, int, bool)) {
switch mask {
case 0:
val = val != (((y + x) % 2) == 0)
break
case 1:
val = val != ((y % 2) == 0)
break
case 2:
val = val != ((x % 3) == 0)
break
case 3:
val = val != (((y + x) % 3) == 0)
break
case 4:
val = val != (((y/2 + x/3) % 2) == 0)
break
case 5:
val = val != (((y*x)%2)+((y*x)%3) == 0)
break
case 6:
val = val != ((((y*x)%2)+((y*x)%3))%2 == 0)
break
case 7:
val = val != ((((y+x)%2)+((y*x)%3))%2 == 0)
}
set(x, y, val)
}
func itterateModules(occupied *qrcode) <-chan image.Point {
result := make(chan image.Point)
allPoints := make(chan image.Point)
go func() {
curX := occupied.dimension - 1
curY := occupied.dimension - 1
isUpward := true
for true {
if isUpward {
allPoints <- image.Pt(curX, curY)
allPoints <- image.Pt(curX-1, curY)
curY -= 1
if curY < 0 {
curY = 0
curX -= 2
if curX == 6 {
curX -= 1
}
if curX < 0 {
break
}
isUpward = false
}
} else {
allPoints <- image.Pt(curX, curY)
allPoints <- image.Pt(curX-1, curY)
curY += 1
if curY >= occupied.dimension {
curY = occupied.dimension - 1
curX -= 2
if curX == 6 {
curX -= 1
}
isUpward = true
if curX < 0 {
break
}
}
}
}
close(allPoints)
}()
go func() {
for pt := range allPoints {
if !occupied.Get(pt.X, pt.Y) {
result <- pt
}
}
close(result)
}()
return result
}
func drawFinderPatterns(vi *versionInfo, set func(int, int, bool)) {
dim := vi.modulWidth()
drawPattern := func(xoff int, yoff int) {
for x := -1; x < 8; x++ {
for y := -1; y < 8; y++ {
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)
if x+xoff >= 0 && x+xoff < dim && y+yoff >= 0 && y+yoff < dim {
set(x+xoff, y+yoff, val)
}
}
}
}
drawPattern(0, 0)
drawPattern(0, dim-7)
drawPattern(dim-7, 0)
}
func drawAlignmentPatterns(occupied *qrcode, vi *versionInfo, set func(int, int, bool)) {
drawPattern := func(xoff int, yoff int) {
for x := -2; x <= 2; x++ {
for y := -2; y <= 2; y++ {
val := x == -2 || x == 2 || y == -2 || y == 2 || (x == 0 && y == 0)
set(x+xoff, y+yoff, val)
}
}
}
positions := vi.alignmentPatternPlacements()
for _, x := range positions {
for _, y := range positions {
if occupied.Get(x, y) {
continue
}
drawPattern(x, y)
}
}
}
func drawFormatInfo(vi *versionInfo, usedMask int, set func(int, int, bool)) {
var formatInfo []bool
switch vi.Level {
case L:
switch usedMask {
case 0:
formatInfo = []bool{true, true, true, false, true, true, true, true, true, false, false, false, true, false, false}
break
case 1:
formatInfo = []bool{true, true, true, false, false, true, false, true, true, true, true, false, false, true, true}
break
case 2:
formatInfo = []bool{true, true, true, true, true, false, true, true, false, true, false, true, false, true, false}
break
case 3:
formatInfo = []bool{true, true, true, true, false, false, false, true, false, false, true, true, true, false, true}
break
case 4:
formatInfo = []bool{true, true, false, false, true, true, false, false, false, true, false, true, true, true, true}
break
case 5:
formatInfo = []bool{true, true, false, false, false, true, true, false, false, false, true, true, false, false, false}
break
case 6:
formatInfo = []bool{true, true, false, true, true, false, false, false, true, false, false, false, false, false, true}
break
case 7:
formatInfo = []bool{true, true, false, true, false, false, true, false, true, true, true, false, true, true, false}
break
}
break
case M:
switch usedMask {
case 0:
formatInfo = []bool{true, false, true, false, true, false, false, false, false, false, true, false, false, true, false}
break
case 1:
formatInfo = []bool{true, false, true, false, false, false, true, false, false, true, false, false, true, false, true}
break
case 2:
formatInfo = []bool{true, false, true, true, true, true, false, false, true, true, true, true, true, false, false}
break
case 3:
formatInfo = []bool{true, false, true, true, false, true, true, false, true, false, false, true, false, true, true}
break
case 4:
formatInfo = []bool{true, false, false, false, true, false, true, true, true, true, true, true, false, false, true}
break
case 5:
formatInfo = []bool{true, false, false, false, false, false, false, true, true, false, false, true, true, true, false}
break
case 6:
formatInfo = []bool{true, false, false, true, true, true, true, true, false, false, true, false, true, true, true}
break
case 7:
formatInfo = []bool{true, false, false, true, false, true, false, true, false, true, false, false, false, false, false}
break
}
break
case Q:
switch usedMask {
case 0:
formatInfo = []bool{false, true, true, false, true, false, true, false, true, false, true, true, true, true, true}
break
case 1:
formatInfo = []bool{false, true, true, false, false, false, false, false, true, true, false, true, false, false, false}
break
case 2:
formatInfo = []bool{false, true, true, true, true, true, true, false, false, true, true, false, false, false, true}
break
case 3:
formatInfo = []bool{false, true, true, true, false, true, false, false, false, false, false, false, true, true, false}
break
case 4:
formatInfo = []bool{false, true, false, false, true, false, false, true, false, true, true, false, true, false, false}
break
case 5:
formatInfo = []bool{false, true, false, false, false, false, true, true, false, false, false, false, false, true, true}
break
case 6:
formatInfo = []bool{false, true, false, true, true, true, false, true, true, false, true, true, false, true, false}
break
case 7:
formatInfo = []bool{false, true, false, true, false, true, true, true, true, true, false, true, true, false, true}
break
}
break
case H:
switch usedMask {
case 0:
formatInfo = []bool{false, false, true, false, true, true, false, true, false, false, false, true, false, false, true}
break
case 1:
formatInfo = []bool{false, false, true, false, false, true, true, true, false, true, true, true, true, true, false}
break
case 2:
formatInfo = []bool{false, false, true, true, true, false, false, true, true, true, false, false, true, true, true}
break
case 3:
formatInfo = []bool{false, false, true, true, false, false, true, true, true, false, true, false, false, false, false}
break
case 4:
formatInfo = []bool{false, false, false, false, true, true, true, false, true, true, false, false, false, true, false}
break
case 5:
formatInfo = []bool{false, false, false, false, false, true, false, false, true, false, true, false, true, false, true}
break
case 6:
formatInfo = []bool{false, false, false, true, true, false, true, false, false, false, false, true, true, false, false}
break
case 7:
formatInfo = []bool{false, false, false, true, false, false, false, false, false, true, true, true, false, true, true}
break
}
break
}
if usedMask == -1 {
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.
}
if len(formatInfo) == 15 {
dim := vi.modulWidth()
set(0, 8, formatInfo[0])
set(1, 8, formatInfo[1])
set(2, 8, formatInfo[2])
set(3, 8, formatInfo[3])
set(4, 8, formatInfo[4])
set(5, 8, formatInfo[5])
set(7, 8, formatInfo[6])
set(8, 8, formatInfo[7])
set(8, 7, formatInfo[8])
set(8, 5, formatInfo[9])
set(8, 4, formatInfo[10])
set(8, 3, formatInfo[11])
set(8, 2, formatInfo[12])
set(8, 1, formatInfo[13])
set(8, 0, formatInfo[14])
set(8, dim-1, formatInfo[0])
set(8, dim-2, formatInfo[1])
set(8, dim-3, formatInfo[2])
set(8, dim-4, formatInfo[3])
set(8, dim-5, formatInfo[4])
set(8, dim-6, formatInfo[5])
set(8, dim-7, formatInfo[6])
set(dim-8, 8, formatInfo[7])
set(dim-7, 8, formatInfo[8])
set(dim-6, 8, formatInfo[9])
set(dim-5, 8, formatInfo[10])
set(dim-4, 8, formatInfo[11])
set(dim-3, 8, formatInfo[12])
set(dim-2, 8, formatInfo[13])
set(dim-1, 8, formatInfo[14])
}
}
func drawVersionInfo(vi *versionInfo, set func(int, int, bool)) {
var versionInfoBits []bool
switch vi.Version {
case 7:
versionInfoBits = []bool{false, false, false, true, true, true, true, true, false, false, true, false, false, true, false, true, false, false}
break
case 8:
versionInfoBits = []bool{false, false, true, false, false, false, false, true, false, true, true, false, true, true, true, true, false, false}
break
case 9:
versionInfoBits = []bool{false, false, true, false, false, true, true, false, true, false, true, false, false, true, true, false, false, true}
break
case 10:
versionInfoBits = []bool{false, false, true, false, true, false, false, true, false, false, true, true, false, true, false, false, true, true}
break
case 11:
versionInfoBits = []bool{false, false, true, false, true, true, true, false, true, true, true, true, true, true, false, true, true, false}
break
case 12:
versionInfoBits = []bool{false, false, true, true, false, false, false, true, true, true, false, true, true, false, false, false, true, false}
break
case 13:
versionInfoBits = []bool{false, false, true, true, false, true, true, false, false, false, false, true, false, false, false, true, true, true}
break
case 14:
versionInfoBits = []bool{false, false, true, true, true, false, false, true, true, false, false, false, false, false, true, true, false, true}
break
case 15:
versionInfoBits = []bool{false, false, true, true, true, true, true, false, false, true, false, false, true, false, true, false, false, false}
break
case 16:
versionInfoBits = []bool{false, true, false, false, false, false, true, false, true, true, false, true, true, true, true, false, false, false}
break
case 17:
versionInfoBits = []bool{false, true, false, false, false, true, false, true, false, false, false, true, false, true, true, true, false, true}
break
case 18:
versionInfoBits = []bool{false, true, false, false, true, false, true, false, true, false, false, false, false, true, false, true, true, true}
break
case 19:
versionInfoBits = []bool{false, true, false, false, true, true, false, true, false, true, false, false, true, true, false, false, true, false}
break
case 20:
versionInfoBits = []bool{false, true, false, true, false, false, true, false, false, true, true, false, true, false, false, true, true, false}
break
case 21:
versionInfoBits = []bool{false, true, false, true, false, true, false, true, true, false, true, false, false, false, false, false, true, true}
break
case 22:
versionInfoBits = []bool{false, true, false, true, true, false, true, false, false, false, true, true, false, false, true, false, false, true}
break
case 23:
versionInfoBits = []bool{false, true, false, true, true, true, false, true, true, true, true, true, true, false, true, true, false, false}
break
case 24:
versionInfoBits = []bool{false, true, true, false, false, false, true, true, true, false, true, true, false, false, false, true, false, false}
break
case 25:
versionInfoBits = []bool{false, true, true, false, false, true, false, false, false, true, true, true, true, false, false, false, false, true}
break
case 26:
versionInfoBits = []bool{false, true, true, false, true, false, true, true, true, true, true, false, true, false, true, false, true, true}
break
case 27:
versionInfoBits = []bool{false, true, true, false, true, true, false, false, false, false, true, false, false, false, true, true, true, false}
break
case 28:
versionInfoBits = []bool{false, true, true, true, false, false, true, true, false, false, false, false, false, true, true, false, true, false}
break
case 29:
versionInfoBits = []bool{false, true, true, true, false, true, false, false, true, true, false, false, true, true, true, true, true, true}
break
case 30:
versionInfoBits = []bool{false, true, true, true, true, false, true, true, false, true, false, true, true, true, false, true, false, true}
break
case 31:
versionInfoBits = []bool{false, true, true, true, true, true, false, false, true, false, false, true, false, true, false, false, false, false}
break
case 32:
versionInfoBits = []bool{true, false, false, false, false, false, true, false, false, true, true, true, false, true, false, true, false, true}
break
case 33:
versionInfoBits = []bool{true, false, false, false, false, true, false, true, true, false, true, true, true, true, false, false, false, false}
break
case 34:
versionInfoBits = []bool{true, false, false, false, true, false, true, false, false, false, true, false, true, true, true, false, true, false}
break
case 35:
versionInfoBits = []bool{true, false, false, false, true, true, false, true, true, true, true, false, false, true, true, true, true, true}
break
case 36:
versionInfoBits = []bool{true, false, false, true, false, false, true, false, true, true, false, false, false, false, true, false, true, true}
break
case 37:
versionInfoBits = []bool{true, false, false, true, false, true, false, true, false, false, false, false, true, false, true, true, true, false}
break
case 38:
versionInfoBits = []bool{true, false, false, true, true, false, true, false, true, false, false, true, true, false, false, true, false, false}
break
case 39:
versionInfoBits = []bool{true, false, false, true, true, true, false, true, false, true, false, true, false, false, false, false, false, true}
break
case 40:
versionInfoBits = []bool{true, false, true, false, false, false, true, true, false, false, false, true, true, false, true, false, false, true}
break
}
if len(versionInfoBits) > 0 {
for i := 0; i < len(versionInfoBits); i++ {
x := (vi.modulWidth() - 11) + i%3
y := i / 3
set(x, y, versionInfoBits[len(versionInfoBits)-i-1])
set(y, x, versionInfoBits[len(versionInfoBits)-i-1])
}
}
}
func addPaddingAndTerminator(bl *barcode.BitList, vi *versionInfo) {
for i := 0; i < 4 && bl.Len() < vi.totalDataBytes()*8; i++ {
bl.AddBit(false)
}
for bl.Len()%8 != 0 {
bl.AddBit(false)
}
for i := 0; bl.Len() < vi.totalDataBytes()*8; i++ {
if i%2 == 0 {
bl.AddByte(236)
} else {
bl.AddByte(17)
}
}
}

11
qr/encoder_test.go Normal file
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@ -0,0 +1,11 @@
package qr
import "testing"
import "image/png"
import "github.com/boombuler/barcode"
import "os"
func Test_EncodeQR(t *testing.T) {
}

75
qr/errorcorrection.go Normal file
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@ -0,0 +1,75 @@
package qr
type galoisField struct {
aLogTbl []byte
logTbl []byte
polynomes map[byte][]byte
}
var gf *galoisField = newGF()
func newGF() *galoisField {
result := new(galoisField)
result.polynomes = make(map[byte][]byte)
result.aLogTbl = make([]byte, 255)
result.logTbl = make([]byte, 256)
result.aLogTbl[0] = 1
x := 1
for i := 1; i < 255; i++ {
x = x * 2
if x > 255 {
x = x ^ 285
}
result.aLogTbl[i] = byte(x)
}
for i := 1; i < 255; i++ {
result.logTbl[result.aLogTbl[i]] = byte(i)
}
return result
}
func (gf *galoisField) getPolynom(eccc byte) []byte {
_, ok := gf.polynomes[eccc]
if !ok {
if eccc == 1 {
gf.polynomes[eccc] = []byte{0, 0}
} else {
b1 := gf.getPolynom(eccc - 1)
result := make([]byte, eccc+1)
for x := 0; x < len(b1); x++ {
tmp1 := (int(b1[x]) + int(eccc-1)) % 255
if x == 0 {
result[x] = b1[x]
} else {
tmp0 := int(gf.aLogTbl[result[x]]) ^ int(gf.aLogTbl[b1[x]])
result[x] = gf.logTbl[tmp0]
}
result[x+1] = byte(tmp1)
}
gf.polynomes[eccc] = result
}
}
return gf.polynomes[eccc]
}
func (gf *galoisField) calcECC(data []byte, eccCount byte) []byte {
tmp := make([]byte, len(data)+int(eccCount))
copy(tmp, data)
generator := gf.getPolynom(eccCount)
for i := 0; i < len(data); i++ {
alpha := gf.logTbl[tmp[i]]
for j := 0; j < len(generator); j++ {
idx := (int(alpha) + int(generator[j])) % 255
polyJ := gf.aLogTbl[idx]
tmp[i+j] = (tmp[i+j] ^ polyJ)
}
}
return tmp[len(data):]
}

50
qr/errorcorrection_test.go Normal file
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@ -0,0 +1,50 @@
package qr
import (
"bytes"
"testing"
)
func Test_LogTables(t *testing.T) {
for i := 1; i <= 255; i++ {
tmp := gf.logTbl[i]
if byte(i) != gf.aLogTbl[tmp] {
t.Errorf("Invalid LogTables: %d", i)
}
}
if gf.aLogTbl[11] != 232 || gf.aLogTbl[87] != 127 || gf.aLogTbl[225] != 36 {
t.Fail()
}
}
func Test_Polynoms(t *testing.T) {
doTest := func(b []byte) {
cnt := byte(len(b) - 1)
if bytes.Compare(gf.getPolynom(cnt), b) != 0 {
t.Errorf("Failed getPolynom(%d)", cnt)
}
}
doTest([]byte{0, 0})
doTest([]byte{0, 87, 229, 146, 149, 238, 102, 21})
doTest([]byte{0, 251, 67, 46, 61, 118, 70, 64, 94, 32, 45})
doTest([]byte{0, 183, 26, 201, 87, 210, 221, 113, 21, 46, 65, 45, 50, 238, 184, 249, 225, 102, 58, 209, 218, 109, 165, 26, 95, 184, 192, 52, 245, 35, 254, 238, 175, 172, 79, 123, 25, 122, 43, 120, 108, 215, 80, 128, 201, 235, 8, 153, 59, 101, 31, 198, 76, 31, 156})
}
func Test_ErrorCorrection(t *testing.T) {
doTest := func(b []byte, ecc []byte) {
cnt := byte(len(ecc))
if bytes.Compare(gf.calcECC(b, cnt), ecc) != 0 {
t.Fail()
}
}
data1 := []byte{16, 32, 12, 86, 97, 128, 236, 17, 236, 17, 236, 17, 236, 17, 236, 17}
doTest(data1, []byte{140, 250})
doTest(data1, []byte{165, 36, 212, 193, 237, 54, 199, 135, 44, 85})
doTest(data1, []byte{227, 219, 167, 206, 127, 77, 181, 205, 203, 131, 6, 102, 62, 113, 173, 153, 69, 210, 55, 111, 146, 227, 13, 144, 249, 87, 103, 81, 30, 125, 189, 61, 142, 129, 129, 43, 148, 88, 25, 249, 37, 58, 57, 108, 91, 241, 78, 248, 226, 177, 17, 58, 59, 218, 53, 146, 96, 165, 146, 163, 198, 190, 15, 71, 117, 164, 167, 53})
data2 := []byte{0, 0, 255, 255}
doTest(data2, []byte{171, 81, 216, 241, 210})
doTest(data2, []byte{12, 183, 205, 34, 73, 117, 36, 75, 237, 235})
}

66
qr/numeric.go Normal file
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@ -0,0 +1,66 @@
package qr
import (
"errors"
"fmt"
"github.com/boombuler/barcode"
"strconv"
)
type numericEncoding struct {
}
var Numeric Encoding = numericEncoding{}
func (ne numericEncoding) String() string {
return "Numeric"
}
func (ne numericEncoding) encode(content string, ecl ErrorCorrectionLevel) (*barcode.BitList, *versionInfo, error) {
contentBitCount := (len(content) / 3) * 10
switch len(content) % 3 {
case 1:
contentBitCount += 4
break
case 2:
contentBitCount += 7
break
}
vi := findSmallestVersionInfo(ecl, numericMode, contentBitCount)
if vi == nil {
return nil, nil, errors.New("To much data to encode")
}
res := new(barcode.BitList)
res.AddBits(int(numericMode), 4)
res.AddBits(len(content), vi.charCountBits(numericMode))
for pos := 0; pos < len(content); pos += 3 {
var curStr string
if pos+3 <= len(content) {
curStr = content[pos : pos+3]
} else {
curStr = content[pos:]
}
i, err := strconv.Atoi(curStr)
if err != nil || i < 0 {
return nil, nil, fmt.Errorf("\"%s\" can not be encoded as %s", content, ne)
}
var bitCnt byte
switch len(curStr) % 3 {
case 0:
bitCnt = 10
case 1:
bitCnt = 4
break
case 2:
bitCnt = 7
break
}
res.AddBits(i, bitCnt)
}
addPaddingAndTerminator(res, vi)
return res, vi, nil
}

21
qr/numeric_test.go Normal file
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@ -0,0 +1,21 @@
package qr
import (
"bytes"
"testing"
)
func Test_NumericEncoding(t *testing.T) {
x, vi, err := Numeric.encode("01234567", H)
if x == nil || vi == nil || vi.Version != 1 || bytes.Compare(x.GetBytes(), []byte{16, 32, 12, 86, 97, 128, 236, 17, 236}) != 0 {
t.Error("\"01234567\" failed to encode")
}
x, vi, err = Numeric.encode("0123456789012345", H)
if x == nil || vi == nil || vi.Version != 1 || bytes.Compare(x.GetBytes(), []byte{16, 64, 12, 86, 106, 110, 20, 234, 80}) != 0 {
t.Error("\"0123456789012345\" failed to encode")
}
x, vi, err = Numeric.encode("foo", H)
if err == nil {
t.Error("Numeric encoding should not be able to encode \"foo\"")
}
}

164
qr/qrcode.go Normal file
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@ -0,0 +1,164 @@
package qr
import (
"github.com/boombuler/barcode"
"image"
"image/color"
"math"
)
type qrcode struct {
dimension int
data *barcode.BitList
content string
}
func (qr *qrcode) Content() string {
return qr.content
}
func (qr *qrcode) Metadata() barcode.Metadata {
return barcode.Metadata{"QR Code", 2}
}
func (qr *qrcode) ColorModel() color.Model {
return color.Gray16Model
}
func (qr *qrcode) Bounds() image.Rectangle {
return image.Rect(0, 0, qr.dimension, qr.dimension)
}
func (qr *qrcode) At(x, y int) color.Color {
if qr.Get(x, y) {
return color.Black
}
return color.White
}
func (qr *qrcode) Get(x, y int) bool {
return qr.data.GetBit(x*qr.dimension + y)
}
func (qr *qrcode) Set(x, y int, val bool) {
qr.data.SetBit(x*qr.dimension+y, val)
}
func (qr *qrcode) calcPenalty() uint {
return qr.calcPenaltyRule1() + qr.calcPenaltyRule2() + qr.calcPenaltyRule3() + qr.calcPenaltyRule4()
}
func (qr *qrcode) calcPenaltyRule1() uint {
var result uint = 0
for x := 0; x < qr.dimension; x++ {
checkForX := false
var cntX uint = 0
checkForY := false
var cntY uint = 0
for y := 0; y < qr.dimension; y++ {
if qr.Get(x, y) == checkForX {
cntX += 1
} else {
checkForX = !checkForX
if cntX >= 5 {
result += cntX - 2
}
cntX = 0
}
if qr.Get(y, x) == checkForY {
cntY += 1
} else {
checkForY = !checkForY
if cntY >= 5 {
result += cntY - 2
}
cntY = 0
}
}
if cntX >= 5 {
result += cntX - 2
}
if cntY >= 5 {
result += cntY - 2
}
}
return result
}
func (qr *qrcode) calcPenaltyRule2() uint {
var result uint = 0
for x := 0; x < qr.dimension-1; x++ {
for y := 0; y < qr.dimension-1; y++ {
check := qr.Get(x, y)
if qr.Get(x, y+1) == check && qr.Get(x+1, y) == check && qr.Get(x+1, y+1) == check {
result += 3
}
}
}
return result
}
func (qr *qrcode) calcPenaltyRule3() uint {
var pattern1 []bool = []bool{true, false, true, true, true, false, true, false, false, false, false}
var pattern2 []bool = []bool{false, false, false, false, true, false, true, true, true, false, true}
var result uint = 0
for x := 0; x <= qr.dimension-len(pattern1); x++ {
for y := 0; y < qr.dimension; y++ {
pattern1XFound := true
pattern2XFound := true
pattern1YFound := true
pattern2YFound := true
for i := 0; i < len(pattern1); i++ {
iv := qr.Get(x+i, y)
if iv != pattern1[i] {
pattern1XFound = false
}
if iv != pattern2[i] {
pattern2XFound = false
}
iv = qr.Get(y, x+i)
if iv != pattern1[i] {
pattern1YFound = false
}
if iv != pattern2[i] {
pattern2YFound = false
}
}
if pattern1XFound || pattern2XFound {
result += 40
}
if pattern1YFound || pattern2YFound {
result += 40
}
}
}
return result
}
func (qr *qrcode) calcPenaltyRule4() uint {
totalNum := qr.data.Len()
trueCnt := 0
for i := 0; i < totalNum; i++ {
if qr.data.GetBit(i) {
trueCnt += 1
}
}
percDark := float64(trueCnt) * 100 / float64(totalNum)
floor := math.Abs(math.Floor(percDark/5) - 10)
ceil := math.Abs(math.Ceil(percDark/5) - 10)
return uint(math.Min(floor, ceil) * 10)
}
func newBarcode(dim int) *qrcode {
res := new(qrcode)
res.dimension = dim
res.data = barcode.NewBitList(dim * dim)
return res
}

61
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package qr
import (
"image/color"
"testing"
)
func Test_NewQRCode(t *testing.T) {
bc := newBarcode(2)
if bc == nil {
t.Fail()
}
if bc.data.Len() != 4 {
t.Fail()
}
if bc.dimension != 2 {
t.Fail()
}
}
func Test_ImageBasics(t *testing.T) {
qr := newBarcode(10)
if qr.ColorModel() != color.Gray16Model {
t.Fail()
}
}
func Test_Penalty4(t *testing.T) {
qr := newBarcode(3)
if qr.calcPenaltyRule4() != 100 {
t.Fail()
}
qr.Set(0, 0, true)
if qr.calcPenaltyRule4() != 70 {
t.Fail()
}
qr.Set(0, 1, true)
if qr.calcPenaltyRule4() != 50 {
t.Fail()
}
qr.Set(0, 2, true)
if qr.calcPenaltyRule4() != 30 {
t.Fail()
}
qr.Set(1, 0, true)
if qr.calcPenaltyRule4() != 10 {
t.Fail()
}
qr.Set(1, 1, true)
if qr.calcPenaltyRule4() != 10 {
t.Fail()
}
qr = newBarcode(2)
qr.Set(0, 0, true)
qr.Set(1, 0, true)
if qr.calcPenaltyRule4() != 0 {
t.Fail()
}
}

304
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package qr
import "math"
type ErrorCorrectionLevel byte
const (
L ErrorCorrectionLevel = iota
M
Q
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 byte
const (
numericMode encodingMode = 1
alphaNumericMode encodingMode = 2
byteMode encodingMode = 4
kanjiMode encodingMode = 8
)
type versionInfo struct {
Version byte
Level ErrorCorrectionLevel
ErrorCorrectionCodewordsPerBlock byte
NumberOfBlocksInGroup1 byte
DataCodeWordsPerBlockInGroup1 byte
NumberOfBlocksInGroup2 byte
DataCodeWordsPerBlockInGroup2 byte
}
var versionInfos []*versionInfo = []*versionInfo{
&versionInfo{1, L, 7, 1, 19, 0, 0},
&versionInfo{1, M, 10, 1, 16, 0, 0},
&versionInfo{1, Q, 13, 1, 13, 0, 0},
&versionInfo{1, H, 17, 1, 9, 0, 0},
&versionInfo{2, L, 10, 1, 34, 0, 0},
&versionInfo{2, M, 16, 1, 28, 0, 0},
&versionInfo{2, Q, 22, 1, 22, 0, 0},
&versionInfo{2, H, 28, 1, 16, 0, 0},
&versionInfo{3, L, 15, 1, 55, 0, 0},
&versionInfo{3, M, 26, 1, 44, 0, 0},
&versionInfo{3, Q, 18, 2, 17, 0, 0},
&versionInfo{3, H, 22, 2, 13, 0, 0},
&versionInfo{4, L, 20, 1, 80, 0, 0},
&versionInfo{4, M, 18, 2, 32, 0, 0},
&versionInfo{4, Q, 26, 2, 24, 0, 0},
&versionInfo{4, H, 16, 4, 9, 0, 0},
&versionInfo{5, L, 26, 1, 108, 0, 0},
&versionInfo{5, M, 24, 2, 43, 0, 0},
&versionInfo{5, Q, 18, 2, 15, 2, 16},
&versionInfo{5, H, 22, 2, 11, 2, 12},
&versionInfo{6, L, 18, 2, 68, 0, 0},
&versionInfo{6, M, 16, 4, 27, 0, 0},
&versionInfo{6, Q, 24, 4, 19, 0, 0},
&versionInfo{6, H, 28, 4, 15, 0, 0},
&versionInfo{7, L, 20, 2, 78, 0, 0},
&versionInfo{7, M, 18, 4, 31, 0, 0},
&versionInfo{7, Q, 18, 2, 14, 4, 15},
&versionInfo{7, H, 26, 4, 13, 1, 14},
&versionInfo{8, L, 24, 2, 97, 0, 0},
&versionInfo{8, M, 22, 2, 38, 2, 39},
&versionInfo{8, Q, 22, 4, 18, 2, 19},
&versionInfo{8, H, 26, 4, 14, 2, 15},
&versionInfo{9, L, 30, 2, 116, 0, 0},
&versionInfo{9, M, 22, 3, 36, 2, 37},
&versionInfo{9, Q, 20, 4, 16, 4, 17},
&versionInfo{9, H, 24, 4, 12, 4, 13},
&versionInfo{10, L, 18, 2, 68, 2, 69},
&versionInfo{10, M, 26, 4, 43, 1, 44},
&versionInfo{10, Q, 24, 6, 19, 2, 20},
&versionInfo{10, H, 28, 6, 15, 2, 16},
&versionInfo{11, L, 20, 4, 81, 0, 0},
&versionInfo{11, M, 30, 1, 50, 4, 51},
&versionInfo{11, Q, 28, 4, 22, 4, 23},
&versionInfo{11, H, 24, 3, 12, 8, 13},
&versionInfo{12, L, 24, 2, 92, 2, 93},
&versionInfo{12, M, 22, 6, 36, 2, 37},
&versionInfo{12, Q, 26, 4, 20, 6, 21},
&versionInfo{12, H, 28, 7, 14, 4, 15},
&versionInfo{13, L, 26, 4, 107, 0, 0},
&versionInfo{13, M, 22, 8, 37, 1, 38},
&versionInfo{13, Q, 24, 8, 20, 4, 21},
&versionInfo{13, H, 22, 12, 11, 4, 12},
&versionInfo{14, L, 30, 3, 115, 1, 116},
&versionInfo{14, M, 24, 4, 40, 5, 41},
&versionInfo{14, Q, 20, 11, 16, 5, 17},
&versionInfo{14, H, 24, 11, 12, 5, 13},
&versionInfo{15, L, 22, 5, 87, 1, 88},
&versionInfo{15, M, 24, 5, 41, 5, 42},
&versionInfo{15, Q, 30, 5, 24, 7, 25},
&versionInfo{15, H, 24, 11, 12, 7, 13},
&versionInfo{16, L, 24, 5, 98, 1, 99},
&versionInfo{16, M, 28, 7, 45, 3, 46},
&versionInfo{16, Q, 24, 15, 19, 2, 20},
&versionInfo{16, H, 30, 3, 15, 13, 16},
&versionInfo{17, L, 28, 1, 107, 5, 108},
&versionInfo{17, M, 28, 10, 46, 1, 47},
&versionInfo{17, Q, 28, 1, 22, 15, 23},
&versionInfo{17, H, 28, 2, 14, 17, 15},
&versionInfo{18, L, 30, 5, 120, 1, 121},
&versionInfo{18, M, 26, 9, 43, 4, 44},
&versionInfo{18, Q, 28, 17, 22, 1, 23},
&versionInfo{18, H, 28, 2, 14, 19, 15},
&versionInfo{19, L, 28, 3, 113, 4, 114},
&versionInfo{19, M, 26, 3, 44, 11, 45},
&versionInfo{19, Q, 26, 17, 21, 4, 22},
&versionInfo{19, H, 26, 9, 13, 16, 14},
&versionInfo{20, L, 28, 3, 107, 5, 108},
&versionInfo{20, M, 26, 3, 41, 13, 42},
&versionInfo{20, Q, 30, 15, 24, 5, 25},
&versionInfo{20, H, 28, 15, 15, 10, 16},
&versionInfo{21, L, 28, 4, 116, 4, 117},
&versionInfo{21, M, 26, 17, 42, 0, 0},
&versionInfo{21, Q, 28, 17, 22, 6, 23},
&versionInfo{21, H, 30, 19, 16, 6, 17},
&versionInfo{22, L, 28, 2, 111, 7, 112},
&versionInfo{22, M, 28, 17, 46, 0, 0},
&versionInfo{22, Q, 30, 7, 24, 16, 25},
&versionInfo{22, H, 24, 34, 13, 0, 0},
&versionInfo{23, L, 30, 4, 121, 5, 122},
&versionInfo{23, M, 28, 4, 47, 14, 48},
&versionInfo{23, Q, 30, 11, 24, 14, 25},
&versionInfo{23, H, 30, 16, 15, 14, 16},
&versionInfo{24, L, 30, 6, 117, 4, 118},
&versionInfo{24, M, 28, 6, 45, 14, 46},
&versionInfo{24, Q, 30, 11, 24, 16, 25},
&versionInfo{24, H, 30, 30, 16, 2, 17},
&versionInfo{25, L, 26, 8, 106, 4, 107},
&versionInfo{25, M, 28, 8, 47, 13, 48},
&versionInfo{25, Q, 30, 7, 24, 22, 25},
&versionInfo{25, H, 30, 22, 15, 13, 16},
&versionInfo{26, L, 28, 10, 114, 2, 115},
&versionInfo{26, M, 28, 19, 46, 4, 47},
&versionInfo{26, Q, 28, 28, 22, 6, 23},
&versionInfo{26, H, 30, 33, 16, 4, 17},
&versionInfo{27, L, 30, 8, 122, 4, 123},
&versionInfo{27, M, 28, 22, 45, 3, 46},
&versionInfo{27, Q, 30, 8, 23, 26, 24},
&versionInfo{27, H, 30, 12, 15, 28, 16},
&versionInfo{28, L, 30, 3, 117, 10, 118},
&versionInfo{28, M, 28, 3, 45, 23, 46},
&versionInfo{28, Q, 30, 4, 24, 31, 25},
&versionInfo{28, H, 30, 11, 15, 31, 16},
&versionInfo{29, L, 30, 7, 116, 7, 117},
&versionInfo{29, M, 28, 21, 45, 7, 46},
&versionInfo{29, Q, 30, 1, 23, 37, 24},
&versionInfo{29, H, 30, 19, 15, 26, 16},
&versionInfo{30, L, 30, 5, 115, 10, 116},
&versionInfo{30, M, 28, 19, 47, 10, 48},
&versionInfo{30, Q, 30, 15, 24, 25, 25},
&versionInfo{30, H, 30, 23, 15, 25, 16},
&versionInfo{31, L, 30, 13, 115, 3, 116},
&versionInfo{31, M, 28, 2, 46, 29, 47},
&versionInfo{31, Q, 30, 42, 24, 1, 25},
&versionInfo{31, H, 30, 23, 15, 28, 16},
&versionInfo{32, L, 30, 17, 115, 0, 0},
&versionInfo{32, M, 28, 10, 46, 23, 47},
&versionInfo{32, Q, 30, 10, 24, 35, 25},
&versionInfo{32, H, 30, 19, 15, 35, 16},
&versionInfo{33, L, 30, 17, 115, 1, 116},
&versionInfo{33, M, 28, 14, 46, 21, 47},
&versionInfo{33, Q, 30, 29, 24, 19, 25},
&versionInfo{33, H, 30, 11, 15, 46, 16},
&versionInfo{34, L, 30, 13, 115, 6, 116},
&versionInfo{34, M, 28, 14, 46, 23, 47},
&versionInfo{34, Q, 30, 44, 24, 7, 25},
&versionInfo{34, H, 30, 59, 16, 1, 17},
&versionInfo{35, L, 30, 12, 121, 7, 122},
&versionInfo{35, M, 28, 12, 47, 26, 48},
&versionInfo{35, Q, 30, 39, 24, 14, 25},
&versionInfo{35, H, 30, 22, 15, 41, 16},
&versionInfo{36, L, 30, 6, 121, 14, 122},
&versionInfo{36, M, 28, 6, 47, 34, 48},
&versionInfo{36, Q, 30, 46, 24, 10, 25},
&versionInfo{36, H, 30, 2, 15, 64, 16},
&versionInfo{37, L, 30, 17, 122, 4, 123},
&versionInfo{37, M, 28, 29, 46, 14, 47},
&versionInfo{37, Q, 30, 49, 24, 10, 25},
&versionInfo{37, H, 30, 24, 15, 46, 16},
&versionInfo{38, L, 30, 4, 122, 18, 123},
&versionInfo{38, M, 28, 13, 46, 32, 47},
&versionInfo{38, Q, 30, 48, 24, 14, 25},
&versionInfo{38, H, 30, 42, 15, 32, 16},
&versionInfo{39, L, 30, 20, 117, 4, 118},
&versionInfo{39, M, 28, 40, 47, 7, 48},
&versionInfo{39, Q, 30, 43, 24, 22, 25},
&versionInfo{39, H, 30, 10, 15, 67, 16},
&versionInfo{40, L, 30, 19, 118, 6, 119},
&versionInfo{40, M, 28, 18, 47, 31, 48},
&versionInfo{40, Q, 30, 34, 24, 34, 25},
&versionInfo{40, H, 30, 20, 15, 61, 16},
}
func (vi *versionInfo) totalDataBytes() int {
g1Data := int(vi.NumberOfBlocksInGroup1) * int(vi.DataCodeWordsPerBlockInGroup1)
g2Data := int(vi.NumberOfBlocksInGroup2) * int(vi.DataCodeWordsPerBlockInGroup2)
return (g1Data + g2Data)
}
func (vi *versionInfo) charCountBits(m encodingMode) byte {
if m == numericMode {
if vi.Version < 10 {
return 10
} else if vi.Version < 27 {
return 12
} else {
return 14
}
} else if m == alphaNumericMode {
if vi.Version < 10 {
return 9
} else if vi.Version < 27 {
return 11
} else {
return 13
}
} else if m == byteMode {
if vi.Version < 10 {
return 8
} else {
return 16
}
} else if m == kanjiMode {
if vi.Version < 10 {
return 8
} else if vi.Version < 27 {
return 10
} else {
return 12
}
}
return 0
}
func (vi *versionInfo) modulWidth() int {
return ((int(vi.Version) - 1) * 4) + 21
}
func (vi *versionInfo) alignmentPatternPlacements() []int {
if vi.Version == 1 {
return make([]int, 0)
}
var first int = 6
var last int = vi.modulWidth() - 7
var space float64 = 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 -= 1
} else {
step += 1
}
}
for i := 1; i <= count-2; i++ {
result[i] = last - (step * (count - 1 - i))
}
}
return result
}
func findSmallestVersionInfo(ecl ErrorCorrectionLevel, mode encodingMode, dataBits int) *versionInfo {
dataBits = dataBits + 4 // mode indicator
for _, vi := range versionInfos {
if vi.Level == ecl {
if (vi.totalDataBytes() * 8) >= (dataBits + int(vi.charCountBits(mode))) {
return vi
}
}
}
return nil
}

143
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package qr
import "testing"
var testvi *versionInfo = &versionInfo{7, M, 0, 1, 10, 2, 5} // Fake versionInfo to run some of the tests
func Test_CharCountBits(t *testing.T) {
v1 := &versionInfo{5, M, 0, 0, 0, 0, 0}
v2 := &versionInfo{15, M, 0, 0, 0, 0, 0}
v3 := &versionInfo{30, M, 0, 0, 0, 0, 0}
if v1.charCountBits(numericMode) != 10 {
t.Fail()
}
if v1.charCountBits(alphaNumericMode) != 9 {
t.Fail()
}
if v1.charCountBits(byteMode) != 8 {
t.Fail()
}
if v1.charCountBits(kanjiMode) != 8 {
t.Fail()
}
if v2.charCountBits(numericMode) != 12 {
t.Fail()
}
if v2.charCountBits(alphaNumericMode) != 11 {
t.Fail()
}
if v2.charCountBits(byteMode) != 16 {
t.Fail()
}
if v2.charCountBits(kanjiMode) != 10 {
t.Fail()
}
if v3.charCountBits(numericMode) != 14 {
t.Fail()
}
if v3.charCountBits(alphaNumericMode) != 13 {
t.Fail()
}
if v3.charCountBits(byteMode) != 16 {
t.Fail()
}
if v3.charCountBits(kanjiMode) != 12 {
t.Fail()
}
}
func Test_TotalDataBytes(t *testing.T) {
if testvi.totalDataBytes() != 20 {
t.Fail()
}
}
func Test_ModulWidth(t *testing.T) {
if testvi.modulWidth() != 45 {
t.Fail()
}
}
func Test_FindSmallestVersionInfo(t *testing.T) {
if findSmallestVersionInfo(H, alphaNumericMode, 10208) != nil {
t.Error("there should be no version with this capacity")
}
test := func(cap int, tVersion byte) {
v := findSmallestVersionInfo(H, alphaNumericMode, cap)
if v == nil || v.Version != tVersion {
t.Errorf("version %d should be returned.", tVersion)
}
}
test(10191, 40)
test(5591, 29)
test(5592, 30)
test(190, 3)
test(200, 4)
}
type aligmnentTest struct {
version byte
patterns []int
}
var allAligmnentTests []*aligmnentTest = []*aligmnentTest{
&aligmnentTest{1, []int{}},
&aligmnentTest{2, []int{6, 18}},
&aligmnentTest{3, []int{6, 22}},
&aligmnentTest{4, []int{6, 26}},
&aligmnentTest{5, []int{6, 30}},
&aligmnentTest{6, []int{6, 34}},
&aligmnentTest{7, []int{6, 22, 38}},
&aligmnentTest{8, []int{6, 24, 42}},
&aligmnentTest{9, []int{6, 26, 46}},
&aligmnentTest{10, []int{6, 28, 50}},
&aligmnentTest{11, []int{6, 30, 54}},
&aligmnentTest{12, []int{6, 32, 58}},
&aligmnentTest{13, []int{6, 34, 62}},
&aligmnentTest{14, []int{6, 26, 46, 66}},
&aligmnentTest{15, []int{6, 26, 48, 70}},
&aligmnentTest{16, []int{6, 26, 50, 74}},
&aligmnentTest{17, []int{6, 30, 54, 78}},
&aligmnentTest{18, []int{6, 30, 56, 82}},
&aligmnentTest{19, []int{6, 30, 58, 86}},
&aligmnentTest{20, []int{6, 34, 62, 90}},
&aligmnentTest{21, []int{6, 28, 50, 72, 94}},
&aligmnentTest{22, []int{6, 26, 50, 74, 98}},
&aligmnentTest{23, []int{6, 30, 54, 78, 102}},
&aligmnentTest{24, []int{6, 28, 54, 80, 106}},
&aligmnentTest{25, []int{6, 32, 58, 84, 110}},
&aligmnentTest{26, []int{6, 30, 58, 86, 114}},
&aligmnentTest{27, []int{6, 34, 62, 90, 118}},
&aligmnentTest{28, []int{6, 26, 50, 74, 98, 122}},
&aligmnentTest{29, []int{6, 30, 54, 78, 102, 126}},
&aligmnentTest{30, []int{6, 26, 52, 78, 104, 130}},
&aligmnentTest{31, []int{6, 30, 56, 82, 108, 134}},
&aligmnentTest{32, []int{6, 34, 60, 86, 112, 138}},
&aligmnentTest{33, []int{6, 30, 58, 86, 114, 142}},
&aligmnentTest{34, []int{6, 34, 62, 90, 118, 146}},
&aligmnentTest{35, []int{6, 30, 54, 78, 102, 126, 150}},
&aligmnentTest{36, []int{6, 24, 50, 76, 102, 128, 154}},
&aligmnentTest{37, []int{6, 28, 54, 80, 106, 132, 158}},
&aligmnentTest{38, []int{6, 32, 58, 84, 110, 136, 162}},
&aligmnentTest{39, []int{6, 26, 54, 82, 110, 138, 166}},
&aligmnentTest{40, []int{6, 30, 58, 86, 114, 142, 170}},
}
func Test_AlignmentPatternPlacements(t *testing.T) {
for _, at := range allAligmnentTests {
vi := &versionInfo{at.version, M, 0, 0, 0, 0, 0}
res := vi.alignmentPatternPlacements()
if len(res) != len(at.patterns) {
t.Errorf("number of alignmentpatterns missmatch for version %d", at.version)
}
for i := 0; i < len(res); i++ {
if res[i] != at.patterns[i] {
t.Errorf("alignmentpatterns for version %d missmatch on index %d", at.version, i)
}
}
}
}

110
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package barcode
import (
"errors"
"fmt"
"image"
"image/color"
"math"
)
type wrapFunc func(x, y int) color.Color
type scaledBarcode struct {
wrapped Barcode
wrapperFunc wrapFunc
rect image.Rectangle
}
func (bc *scaledBarcode) Content() string {
return bc.wrapped.Content()
}
func (bc *scaledBarcode) Metadata() Metadata {
return bc.wrapped.Metadata()
}
func (bc *scaledBarcode) ColorModel() color.Model {
return bc.wrapped.ColorModel()
}
func (bc *scaledBarcode) Bounds() image.Rectangle {
return bc.rect
}
func (bc *scaledBarcode) At(x, y int) color.Color {
return bc.wrapperFunc(x, y)
}
func Scale(bc Barcode, width, height int) (Barcode, error) {
switch bc.Metadata().Dimensions {
case 1:
return scale1DCode(bc, width, height)
case 2:
return scale2DCode(bc, width, height)
}
return nil, errors.New("unsupported barcode format")
}
func scale2DCode(bc Barcode, width, height int) (Barcode, error) {
orgBounds := bc.Bounds()
orgWidth := orgBounds.Max.X - orgBounds.Min.X
orgHeight := orgBounds.Max.Y - orgBounds.Min.Y
factor := int(math.Min(float64(width)/float64(orgWidth), float64(height)/float64(orgHeight)))
if factor <= 0 {
return nil, fmt.Errorf("can no scale barcode to an image smaller then %dx%d", orgWidth, orgHeight)
}
offsetX := (width - (orgWidth * factor)) / 2
offsetY := (height - (orgHeight * factor)) / 2
wrap := func(x, y int) color.Color {
if x < offsetX || y < offsetY {
return color.White
}
x = (x - offsetX) / factor
y = (y - offsetY) / factor
if x >= orgWidth || y >= orgHeight {
return color.White
}
return bc.At(x, y)
}
return &scaledBarcode{
bc,
wrap,
image.Rect(0, 0, width, height),
}, nil
}
func scale1DCode(bc Barcode, width, height int) (Barcode, error) {
orgBounds := bc.Bounds()
orgWidth := orgBounds.Max.X - orgBounds.Min.X
factor := int(float64(width) / float64(orgWidth))
if factor <= 0 {
return nil, fmt.Errorf("can no scale barcode to an image smaller then %dx1", orgWidth)
}
offsetX := (width - (orgWidth * factor)) / 2
wrap := func(x, y int) color.Color {
if x < offsetX {
return color.White
}
x = (x - offsetX) / factor
if x >= orgWidth {
return color.White
}
return bc.At(x, 0)
}
return &scaledBarcode{
bc,
wrap,
image.Rect(0, 0, width, height),
}, nil
}