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67 lines
1.4 KiB
67 lines
1.4 KiB
package qr
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import (
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"errors"
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"fmt"
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"strings"
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"github.com/boombuler/barcode/utils"
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)
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const charSet string = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ $%*+-./:"
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func stringToAlphaIdx(content string) <-chan int {
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result := make(chan int)
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go func() {
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for _, r := range content {
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idx := strings.IndexRune(charSet, r)
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result <- idx
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if idx < 0 {
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break
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}
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}
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close(result)
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}()
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return result
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}
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func encodeAlphaNumeric(content string, ecl ErrorCorrectionLevel) (*utils.BitList, *versionInfo, error) {
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contentLenIsOdd := len(content)%2 == 1
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contentBitCount := (len(content) / 2) * 11
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if contentLenIsOdd {
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contentBitCount += 6
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}
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vi := findSmallestVersionInfo(ecl, alphaNumericMode, 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(alphaNumericMode), 4)
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res.AddBits(len(content), vi.charCountBits(alphaNumericMode))
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encoder := stringToAlphaIdx(content)
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for idx := 0; idx < len(content)/2; idx++ {
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c1 := <-encoder
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c2 := <-encoder
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if c1 < 0 || c2 < 0 {
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return nil, nil, fmt.Errorf("\"%s\" can not be encoded as %s", content, AlphaNumeric)
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}
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res.AddBits(c1*45+c2, 11)
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}
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if contentLenIsOdd {
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c := <-encoder
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if c < 0 {
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return nil, nil, fmt.Errorf("\"%s\" can not be encoded as %s", content, AlphaNumeric)
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}
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res.AddBits(c, 6)
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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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