62 lines
1.7 KiB
Go
62 lines
1.7 KiB
Go
package qr
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import (
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"errors"
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"fmt"
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"github.com/boombuler/barcode"
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)
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type alphaNumericEncoding struct {
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}
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var AlphaNumeric Encoding = alphaNumericEncoding{}
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var alphaNumericTable map[byte]int = map[byte]int{
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'0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9,
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'A': 10, 'B': 11, 'C': 12, 'D': 13, 'E': 14, 'F': 15, 'G': 16, 'H': 17, 'I': 18, 'J': 19,
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'K': 20, 'L': 21, 'M': 22, 'N': 23, 'O': 24, 'P': 25, 'Q': 26, 'R': 27, 'S': 28, 'T': 29,
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'U': 30, 'V': 31, 'W': 32, 'X': 33, 'Y': 34, 'Z': 35, ' ': 36, '$': 37, '%': 38, '*': 39,
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'+': 40, '-': 41, '.': 42, '/': 43, ':': 44,
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}
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func (ane alphaNumericEncoding) String() string {
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return "AlphaNumeric"
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}
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func (ane alphaNumericEncoding) encode(content string, ecl ErrorCorrectionLevel) (*barcode.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(barcode.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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for idx := 0; idx < len(content)/2; idx++ {
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c1, ok1 := alphaNumericTable[content[idx*2]]
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c2, ok2 := alphaNumericTable[content[(idx*2)+1]]
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if !ok1 || !ok2 {
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return nil, nil, fmt.Errorf("\"%s\" can not be encoded as %s", content, ane)
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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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c1, ok := alphaNumericTable[content[len(content)-1]]
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if !ok {
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return nil, nil, fmt.Errorf("\"%s\" can not be encoded as %s", content, ane)
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}
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res.AddBits(c1, 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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