153 lines
7.4 KiB
Go
153 lines
7.4 KiB
Go
// Package code39 can create Code39 barcodes
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package code39
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import (
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"errors"
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"strconv"
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"strings"
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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 encodeInfo struct {
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value int
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data []bool
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}
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var encodeTable = map[rune]encodeInfo{
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'0': encodeInfo{0, []bool{true, false, true, false, false, true, true, false, true, true, false, true}},
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'1': encodeInfo{1, []bool{true, true, false, true, false, false, true, false, true, false, true, true}},
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'2': encodeInfo{2, []bool{true, false, true, true, false, false, true, false, true, false, true, true}},
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'3': encodeInfo{3, []bool{true, true, false, true, true, false, false, true, false, true, false, true}},
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'4': encodeInfo{4, []bool{true, false, true, false, false, true, true, false, true, false, true, true}},
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'5': encodeInfo{5, []bool{true, true, false, true, false, false, true, true, false, true, false, true}},
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'6': encodeInfo{6, []bool{true, false, true, true, false, false, true, true, false, true, false, true}},
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'7': encodeInfo{7, []bool{true, false, true, false, false, true, false, true, true, false, true, true}},
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'8': encodeInfo{8, []bool{true, true, false, true, false, false, true, false, true, true, false, true}},
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'9': encodeInfo{9, []bool{true, false, true, true, false, false, true, false, true, true, false, true}},
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'A': encodeInfo{10, []bool{true, true, false, true, false, true, false, false, true, false, true, true}},
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'B': encodeInfo{11, []bool{true, false, true, true, false, true, false, false, true, false, true, true}},
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'C': encodeInfo{12, []bool{true, true, false, true, true, false, true, false, false, true, false, true}},
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'D': encodeInfo{13, []bool{true, false, true, false, true, true, false, false, true, false, true, true}},
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'E': encodeInfo{14, []bool{true, true, false, true, false, true, true, false, false, true, false, true}},
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'F': encodeInfo{15, []bool{true, false, true, true, false, true, true, false, false, true, false, true}},
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'G': encodeInfo{16, []bool{true, false, true, false, true, false, false, true, true, false, true, true}},
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'H': encodeInfo{17, []bool{true, true, false, true, false, true, false, false, true, true, false, true}},
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'I': encodeInfo{18, []bool{true, false, true, true, false, true, false, false, true, true, false, true}},
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'J': encodeInfo{19, []bool{true, false, true, false, true, true, false, false, true, true, false, true}},
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'K': encodeInfo{20, []bool{true, true, false, true, false, true, false, true, false, false, true, true}},
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'L': encodeInfo{21, []bool{true, false, true, true, false, true, false, true, false, false, true, true}},
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'M': encodeInfo{22, []bool{true, true, false, true, true, false, true, false, true, false, false, true}},
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'N': encodeInfo{23, []bool{true, false, true, false, true, true, false, true, false, false, true, true}},
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'O': encodeInfo{24, []bool{true, true, false, true, false, true, true, false, true, false, false, true}},
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'P': encodeInfo{25, []bool{true, false, true, true, false, true, true, false, true, false, false, true}},
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'Q': encodeInfo{26, []bool{true, false, true, false, true, false, true, true, false, false, true, true}},
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'R': encodeInfo{27, []bool{true, true, false, true, false, true, false, true, true, false, false, true}},
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'S': encodeInfo{28, []bool{true, false, true, true, false, true, false, true, true, false, false, true}},
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'T': encodeInfo{29, []bool{true, false, true, false, true, true, false, true, true, false, false, true}},
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'U': encodeInfo{30, []bool{true, true, false, false, true, false, true, false, true, false, true, true}},
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'V': encodeInfo{31, []bool{true, false, false, true, true, false, true, false, true, false, true, true}},
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'W': encodeInfo{32, []bool{true, true, false, false, true, true, false, true, false, true, false, true}},
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'X': encodeInfo{33, []bool{true, false, false, true, false, true, true, false, true, false, true, true}},
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'Y': encodeInfo{34, []bool{true, true, false, false, true, false, true, true, false, true, false, true}},
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'Z': encodeInfo{35, []bool{true, false, false, true, true, false, true, true, false, true, false, true}},
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'-': encodeInfo{36, []bool{true, false, false, true, false, true, false, true, true, false, true, true}},
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'.': encodeInfo{37, []bool{true, true, false, false, true, false, true, false, true, true, false, true}},
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' ': encodeInfo{38, []bool{true, false, false, true, true, false, true, false, true, true, false, true}},
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'$': encodeInfo{39, []bool{true, false, false, true, false, false, true, false, false, true, false, true}},
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'/': encodeInfo{40, []bool{true, false, false, true, false, false, true, false, true, false, false, true}},
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'+': encodeInfo{41, []bool{true, false, false, true, false, true, false, false, true, false, false, true}},
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'%': encodeInfo{42, []bool{true, false, true, false, false, true, false, false, true, false, false, true}},
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'*': encodeInfo{-1, []bool{true, false, false, true, false, true, true, false, true, true, false, true}},
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}
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var extendedTable = map[rune]string{
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0: `%U`, 1: `$A`, 2: `$B`, 3: `$C`, 4: `$D`, 5: `$E`, 6: `$F`, 7: `$G`, 8: `$H`, 9: `$I`, 10: `$J`,
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11: `$K`, 12: `$L`, 13: `$M`, 14: `$N`, 15: `$O`, 16: `$P`, 17: `$Q`, 18: `$R`, 19: `$S`, 20: `$T`,
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21: `$U`, 22: `$V`, 23: `$W`, 24: `$X`, 25: `$Y`, 26: `$Z`, 27: `%A`, 28: `%B`, 29: `%C`, 30: `%D`,
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31: `%E`, 33: `/A`, 34: `/B`, 35: `/C`, 36: `/D`, 37: `/E`, 38: `/F`, 39: `/G`, 40: `/H`, 41: `/I`,
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42: `/J`, 43: `/K`, 44: `/L`, 47: `/O`, 58: `/Z`, 59: `%F`, 60: `%G`, 61: `%H`, 62: `%I`, 63: `%J`,
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64: `%V`, 91: `%K`, 92: `%L`, 93: `%M`, 94: `%N`, 95: `%O`, 96: `%W`, 97: `+A`, 98: `+B`, 99: `+C`,
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100: `+D`, 101: `+E`, 102: `+F`, 103: `+G`, 104: `+H`, 105: `+I`, 106: `+J`, 107: `+K`, 108: `+L`,
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109: `+M`, 110: `+N`, 111: `+O`, 112: `+P`, 113: `+Q`, 114: `+R`, 115: `+S`, 116: `+T`, 117: `+U`,
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118: `+V`, 119: `+W`, 120: `+X`, 121: `+Y`, 122: `+Z`, 123: `%P`, 124: `%Q`, 125: `%R`, 126: `%S`,
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127: `%T`,
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}
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func getChecksum(content string) string {
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sum := 0
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for _, r := range content {
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info, ok := encodeTable[r]
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if !ok || info.value < 0 {
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return "#"
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}
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sum += info.value
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}
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sum = sum % 43
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for r, v := range encodeTable {
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if v.value == sum {
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return string(r)
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}
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}
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return "#"
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}
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func prepare(content string) (string, error) {
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result := ""
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for _, r := range content {
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if r > 127 {
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return "", errors.New("Only ASCII strings can be encoded")
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}
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val, ok := extendedTable[r]
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if ok {
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result += val
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} else {
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result += string([]rune{r})
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}
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}
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return result, nil
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}
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// Encode returns a code39 barcode for the given content
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// if includeChecksum is set to true, a checksum character is calculated and added to the content
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func Encode(content string, includeChecksum bool, fullASCIIMode bool) (barcode.BarcodeIntCS, error) {
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if fullASCIIMode {
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var err error
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content, err = prepare(content)
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if err != nil {
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return nil, err
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}
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} else if strings.ContainsRune(content, '*') {
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return nil, errors.New("invalid data! try full ascii mode")
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}
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data := "*" + content
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if includeChecksum {
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data += getChecksum(content)
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}
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data += "*"
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result := new(utils.BitList)
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for i, r := range data {
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if i != 0 {
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result.AddBit(false)
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}
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info, ok := encodeTable[r]
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if !ok {
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return nil, errors.New("invalid data! try full ascii mode")
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}
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result.AddBit(info.data...)
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}
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checkSum, err := strconv.ParseInt(getChecksum(content), 10, 64)
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if err != nil {
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checkSum = 0
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}
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return utils.New1DCodeIntCheckSum(barcode.TypeCode39, content, result, int(checkSum)), nil
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}
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