112 lines
5.7 KiB
Go
112 lines
5.7 KiB
Go
package code39
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import (
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"errors"
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"github.com/boombuler/barcode"
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"strings"
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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 = 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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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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// encodes the given string as a code39 barcode
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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) (barcode.Barcode, error) {
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if strings.ContainsRune(content, '*') {
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return nil, errors.New("invalid data")
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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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cd := newCode()
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for i, r := range data {
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if i != 0 {
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cd.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")
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}
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for _, bit := range info.data {
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cd.AddBit(bit)
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}
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}
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return cd, nil
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}
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