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// Package code39 can create Code39 barcodes
package code39
import (
"errors"
"strings"
"github.com/boombuler/barcode"
"github.com/boombuler/barcode/utils"
)
type encodeInfo struct {
value int
data []bool
}
var encodeTable = map[rune]encodeInfo{
'0': encodeInfo{0, []bool{true, false, true, false, false, true, true, false, true, true, false, true}},
'1': encodeInfo{1, []bool{true, true, false, true, false, false, true, false, true, false, true, true}},
'2': encodeInfo{2, []bool{true, false, true, true, false, false, true, false, true, false, true, true}},
'3': encodeInfo{3, []bool{true, true, false, true, true, false, false, true, false, true, false, true}},
'4': encodeInfo{4, []bool{true, false, true, false, false, true, true, false, true, false, true, true}},
'5': encodeInfo{5, []bool{true, true, false, true, false, false, true, true, false, true, false, true}},
'6': encodeInfo{6, []bool{true, false, true, true, false, false, true, true, false, true, false, true}},
'7': encodeInfo{7, []bool{true, false, true, false, false, true, false, true, true, false, true, true}},
'8': encodeInfo{8, []bool{true, true, false, true, false, false, true, false, true, true, false, true}},
'9': encodeInfo{9, []bool{true, false, true, true, false, false, true, false, true, true, false, true}},
'A': encodeInfo{10, []bool{true, true, false, true, false, true, false, false, true, false, true, true}},
'B': encodeInfo{11, []bool{true, false, true, true, false, true, false, false, true, false, true, true}},
'C': encodeInfo{12, []bool{true, true, false, true, true, false, true, false, false, true, false, true}},
'D': encodeInfo{13, []bool{true, false, true, false, true, true, false, false, true, false, true, true}},
'E': encodeInfo{14, []bool{true, true, false, true, false, true, true, false, false, true, false, true}},
'F': encodeInfo{15, []bool{true, false, true, true, false, true, true, false, false, true, false, true}},
'G': encodeInfo{16, []bool{true, false, true, false, true, false, false, true, true, false, true, true}},
'H': encodeInfo{17, []bool{true, true, false, true, false, true, false, false, true, true, false, true}},
'I': encodeInfo{18, []bool{true, false, true, true, false, true, false, false, true, true, false, true}},
'J': encodeInfo{19, []bool{true, false, true, false, true, true, false, false, true, true, false, true}},
'K': encodeInfo{20, []bool{true, true, false, true, false, true, false, true, false, false, true, true}},
'L': encodeInfo{21, []bool{true, false, true, true, false, true, false, true, false, false, true, true}},
'M': encodeInfo{22, []bool{true, true, false, true, true, false, true, false, true, false, false, true}},
'N': encodeInfo{23, []bool{true, false, true, false, true, true, false, true, false, false, true, true}},
'O': encodeInfo{24, []bool{true, true, false, true, false, true, true, false, true, false, false, true}},
'P': encodeInfo{25, []bool{true, false, true, true, false, true, true, false, true, false, false, true}},
'Q': encodeInfo{26, []bool{true, false, true, false, true, false, true, true, false, false, true, true}},
'R': encodeInfo{27, []bool{true, true, false, true, false, true, false, true, true, false, false, true}},
'S': encodeInfo{28, []bool{true, false, true, true, false, true, false, true, true, false, false, true}},
'T': encodeInfo{29, []bool{true, false, true, false, true, true, false, true, true, false, false, true}},
'U': encodeInfo{30, []bool{true, true, false, false, true, false, true, false, true, false, true, true}},
'V': encodeInfo{31, []bool{true, false, false, true, true, false, true, false, true, false, true, true}},
'W': encodeInfo{32, []bool{true, true, false, false, true, true, false, true, false, true, false, true}},
'X': encodeInfo{33, []bool{true, false, false, true, false, true, true, false, true, false, true, true}},
'Y': encodeInfo{34, []bool{true, true, false, false, true, false, true, true, false, true, false, true}},
'Z': encodeInfo{35, []bool{true, false, false, true, true, false, true, true, false, true, false, true}},
'-': encodeInfo{36, []bool{true, false, false, true, false, true, false, true, true, false, true, true}},
'.': encodeInfo{37, []bool{true, true, false, false, true, false, true, false, true, true, false, true}},
' ': encodeInfo{38, []bool{true, false, false, true, true, false, true, false, true, true, false, true}},
'$': encodeInfo{39, []bool{true, false, false, true, false, false, true, false, false, true, false, true}},
'/': encodeInfo{40, []bool{true, false, false, true, false, false, true, false, true, false, false, true}},
'+': encodeInfo{41, []bool{true, false, false, true, false, true, false, false, true, false, false, true}},
'%': encodeInfo{42, []bool{true, false, true, false, false, true, false, false, true, false, false, true}},
'*': encodeInfo{-1, []bool{true, false, false, true, false, true, true, false, true, true, false, true}},
}
var extendedTable = map[rune]string{
0: `%U`, 1: `$A`, 2: `$B`, 3: `$C`, 4: `$D`, 5: `$E`, 6: `$F`, 7: `$G`, 8: `$H`, 9: `$I`, 10: `$J`,
11: `$K`, 12: `$L`, 13: `$M`, 14: `$N`, 15: `$O`, 16: `$P`, 17: `$Q`, 18: `$R`, 19: `$S`, 20: `$T`,
21: `$U`, 22: `$V`, 23: `$W`, 24: `$X`, 25: `$Y`, 26: `$Z`, 27: `%A`, 28: `%B`, 29: `%C`, 30: `%D`,
31: `%E`, 33: `/A`, 34: `/B`, 35: `/C`, 36: `/D`, 37: `/E`, 38: `/F`, 39: `/G`, 40: `/H`, 41: `/I`,
42: `/J`, 43: `/K`, 44: `/L`, 47: `/O`, 58: `/Z`, 59: `%F`, 60: `%G`, 61: `%H`, 62: `%I`, 63: `%J`,
64: `%V`, 91: `%K`, 92: `%L`, 93: `%M`, 94: `%N`, 95: `%O`, 96: `%W`, 97: `+A`, 98: `+B`, 99: `+C`,
100: `+D`, 101: `+E`, 102: `+F`, 103: `+G`, 104: `+H`, 105: `+I`, 106: `+J`, 107: `+K`, 108: `+L`,
109: `+M`, 110: `+N`, 111: `+O`, 112: `+P`, 113: `+Q`, 114: `+R`, 115: `+S`, 116: `+T`, 117: `+U`,
118: `+V`, 119: `+W`, 120: `+X`, 121: `+Y`, 122: `+Z`, 123: `%P`, 124: `%Q`, 125: `%R`, 126: `%S`,
127: `%T`,
}
func getChecksum(content string) string {
sum := 0
for _, r := range content {
info, ok := encodeTable[r]
if !ok || info.value < 0 {
return "#"
}
sum += info.value
}
sum = sum % 43
for r, v := range encodeTable {
if v.value == sum {
return string(r)
}
}
return "#"
}
func prepare(content string) (string, error) {
result := ""
for _, r := range content {
if r > 127 {
return "", errors.New("Only ASCII strings can be encoded")
}
val, ok := extendedTable[r]
if ok {
result += val
} else {
result += string([]rune{r})
}
}
return result, nil
}
// Encode returns a code39 barcode for the given content
// if includeChecksum is set to true, a checksum character is calculated and added to the content
func Encode(content string, includeChecksum bool, fullASCIIMode bool) (barcode.Barcode, error) {
if fullASCIIMode {
var err error
content, err = prepare(content)
if err != nil {
return nil, err
}
} else if strings.ContainsRune(content, '*') {
return nil, errors.New("invalid data! try full ascii mode")
}
data := "*" + content
if includeChecksum {
data += getChecksum(content)
}
data += "*"
result := new(utils.BitList)
for i, r := range data {
if i != 0 {
result.AddBit(false)
}
info, ok := encodeTable[r]
if !ok {
return nil, errors.New("invalid data! try full ascii mode")
}
result.AddBit(info.data...)
}
return utils.New1DCode("Code 39", content, result), nil
}
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