Function encodeAlphanumericCharacter

encoder.go:453–486

encodeAlphanumericChar returns the QR Code encoded value of v. v must be a QR Code defined alphanumeric character: 0-9, A-Z, SP, $%*+-./ or :. The characters are mapped to values in the range 0-44 respectively.

(v byte)

// v must be a QR Code defined alphanumeric character: 0-9, A-Z, SP, $%*+-./ or
// :. The characters are mapped to values in the range 0-44 respectively.
func encodeAlphanumericCharacter(v byte) uint32 {
	c := uint32(v)

	switch {
	case c >= '0' && c <= '9':
		// 0-9 encoded as 0-9.
		return c - '0'
	case c >= 'A' && c <= 'Z':
		// A-Z encoded as 10-35.
		return c - 'A' + 10
	case c == ' ':
		return 36
	case c == '$':
		return 37
	case c == '%':
		return 38
	case c == '*':
		return 39
	case c == '+':
		return 40
	case c == '-':
		return 41
	case c == '.':
		return 42
	case c == '/':
		return 43
	case c == ':':
		return 44
	default:
		log.Panicf("encodeAlphanumericCharacter() with non alphanumeric char %v.", v)
	}

	return 0
}