forked from boombuler/barcode
/
encoder.go
147 lines (132 loc) · 7.22 KB
/
encoder.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
// 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
}