示例#1
0
func encodeUnicode(content string, ecl ErrorCorrectionLevel) (*utils.BitList, *versionInfo, error) {
	data := []byte(content)

	vi := findSmallestVersionInfo(ecl, byteMode, len(data)*8)
	if vi == nil {
		return nil, nil, errors.New("To much data to encode")
	}

	// It's not correct to add the unicode bytes to the result directly but most readers can't handle the
	// required ECI header...
	res := new(utils.BitList)
	res.AddBits(int(byteMode), 4)
	res.AddBits(len(content), vi.charCountBits(byteMode))
	for _, b := range data {
		res.AddByte(b)
	}
	addPaddingAndTerminator(res, vi)
	return res, vi, nil
}
示例#2
0
func encodeAlphaNumeric(content string, ecl ErrorCorrectionLevel) (*utils.BitList, *versionInfo, error) {

	contentLenIsOdd := len(content)%2 == 1
	contentBitCount := (len(content) / 2) * 11
	if contentLenIsOdd {
		contentBitCount += 6
	}
	vi := findSmallestVersionInfo(ecl, alphaNumericMode, contentBitCount)
	if vi == nil {
		return nil, nil, errors.New("To much data to encode")
	}

	res := new(utils.BitList)
	res.AddBits(int(alphaNumericMode), 4)
	res.AddBits(len(content), vi.charCountBits(alphaNumericMode))

	encoder := stringToAlphaIdx(content)

	for idx := 0; idx < len(content)/2; idx++ {
		c1 := <-encoder
		c2 := <-encoder
		if c1 < 0 || c2 < 0 {
			return nil, nil, fmt.Errorf("\"%s\" can not be encoded as %s", content, AlphaNumeric)
		}
		res.AddBits(c1*45+c2, 11)
	}
	if contentLenIsOdd {
		c := <-encoder
		if c < 0 {
			return nil, nil, fmt.Errorf("\"%s\" can not be encoded as %s", content, AlphaNumeric)
		}
		res.AddBits(c, 6)
	}

	addPaddingAndTerminator(res, vi)

	return res, vi, nil
}
示例#3
0
func encodeNumeric(content string, ecl ErrorCorrectionLevel) (*utils.BitList, *versionInfo, error) {
	contentBitCount := (len(content) / 3) * 10
	switch len(content) % 3 {
	case 1:
		contentBitCount += 4
	case 2:
		contentBitCount += 7
	}
	vi := findSmallestVersionInfo(ecl, numericMode, contentBitCount)
	if vi == nil {
		return nil, nil, errors.New("To much data to encode")
	}
	res := new(utils.BitList)
	res.AddBits(int(numericMode), 4)
	res.AddBits(len(content), vi.charCountBits(numericMode))

	for pos := 0; pos < len(content); pos += 3 {
		var curStr string
		if pos+3 <= len(content) {
			curStr = content[pos : pos+3]
		} else {
			curStr = content[pos:]
		}

		i, err := strconv.Atoi(curStr)
		if err != nil || i < 0 {
			return nil, nil, fmt.Errorf("\"%s\" can not be encoded as %s", content, Numeric)
		}
		var bitCnt byte
		switch len(curStr) % 3 {
		case 0:
			bitCnt = 10
		case 1:
			bitCnt = 4
			break
		case 2:
			bitCnt = 7
			break
		}

		res.AddBits(i, bitCnt)
	}

	addPaddingAndTerminator(res, vi)
	return res, vi, nil
}