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57 lines
1.1 KiB
57 lines
1.1 KiB
package qr
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import (
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"errors"
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"fmt"
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"strconv"
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"github.com/boombuler/barcode/utils"
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)
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func encodeNumeric(content string, ecl ErrorCorrectionLevel) (*utils.BitList, *versionInfo, error) {
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contentBitCount := (len(content) / 3) * 10
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switch len(content) % 3 {
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case 1:
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contentBitCount += 4
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case 2:
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contentBitCount += 7
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}
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vi := findSmallestVersionInfo(ecl, numericMode, contentBitCount)
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if vi == nil {
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return nil, nil, errors.New("To much data to encode")
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}
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res := new(utils.BitList)
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res.AddBits(int(numericMode), 4)
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res.AddBits(len(content), vi.charCountBits(numericMode))
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for pos := 0; pos < len(content); pos += 3 {
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var curStr string
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if pos+3 <= len(content) {
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curStr = content[pos : pos+3]
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} else {
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curStr = content[pos:]
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}
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i, err := strconv.Atoi(curStr)
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if err != nil || i < 0 {
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return nil, nil, fmt.Errorf("\"%s\" can not be encoded as %s", content, Numeric)
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}
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var bitCnt byte
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switch len(curStr) % 3 {
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case 0:
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bitCnt = 10
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case 1:
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bitCnt = 4
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break
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case 2:
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bitCnt = 7
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break
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}
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res.AddBits(i, bitCnt)
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}
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addPaddingAndTerminator(res, vi)
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return res, vi, nil
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}
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