1 package qr
2
3 import (
4 "errors"
5 "fmt"
6 "strconv"
7
8 "github.com/boombuler/barcode/utils"
9 )
10
11 func encodeNumeric(content string, ecl ErrorCorrectionLevel) (*utils.BitList, *versionInfo, error) {
12 contentBitCount := (len(content) / 3) * 10
13 switch len(content) % 3 {
14 case 1:
15 contentBitCount += 4
16 case 2:
17 contentBitCount += 7
18 }
19 vi := findSmallestVersionInfo(ecl, numericMode, contentBitCount)
20 if vi == nil {
21 return nil, nil, errors.New("To much data to encode")
22 }
23 res := new(utils.BitList)
24 res.AddBits(int(numericMode), 4)
25 res.AddBits(len(content), vi.charCountBits(numericMode))
26
27 for pos := 0; pos < len(content); pos += 3 {
28 var curStr string
29 if pos+3 <= len(content) {
30 curStr = content[pos : pos+3]
31 } else {
32 curStr = content[pos:]
33 }
34
35 i, err := strconv.Atoi(curStr)
36 if err != nil || i < 0 {
37 return nil, nil, fmt.Errorf("\"%s\" can not be encoded as %s", content, Numeric)
38 }
39 var bitCnt byte
40 switch len(curStr) % 3 {
41 case 0:
42 bitCnt = 10
43 case 1:
44 bitCnt = 4
45 break
46 case 2:
47 bitCnt = 7
48 break
49 }
50
51 res.AddBits(i, bitCnt)
52 }
53
54 addPaddingAndTerminator(res, vi)
55 return res, vi, nil
56 }
57
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