(Swift 3,4,5...) ZATCA Decode QR Code

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Decodes a base64 ZATCA QR code.

Note: This example requires Chilkat v9.5.0.92 or greater.

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func chilkatTest() {
    // Note: This example requires Chilkat v9.5.0.92 or greater.

    var qr: String? = "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"

    qr = "AQxGaXJveiBBc2hyYWYCCjEyMzQ1Njc4OTEDEzIwMjEtMTEtMTcgMDg6MzA6MDAEBjEwMC4wMAUFMTUuMDAGLDlmc3JYVW8rU3BYQVlJTkw5aGFLU2dEOXgxaVJsZk53SVBDZnBlWXczYTA9B1hYMEM4VjFIL3hUMGdOaytWWXh2U2Z6UFJlUjZPM2t5VXA0TERITzJLMzlNSGJETXVvTGltQSt3RnovV2pVdEdMSHpaK0J5enNmWUdEQzliNUFGSU1FQT09CFgwVjAQBgcqhkjOPQIBBgUrgQQACgNCAARw3B+mu14x0h3pJFKqEWWT7DmD7jWYkZV7qHyikPlN4P/4/b7YD+A9wnFI92HTKm+/BGKXVf/pfLtsmdIIaPHnCUgwRgIhAMTjOkWwcNu5Aw5k1Yr3YgbPhdxKoJV1a3+5ShPtx1/IAiEAyrwsA/NuqV6XjybyrZpMp6eJAqslACLfCldti/PVOQs="

    let bd = CkoBinData()!
    var success: Bool = bd.appendEncoded(qr, encoding: "base64")

    var index: Int = 0
    var expectedTag: Int = 1
    var tag: Int
    var len: Int
    var tagValue: String?

    while (expectedTag <= 9) {

        // Get the tag
        tag = bd.getByte(index).intValue
        if tag != expectedTag {
            print("Expected tag \(expectedTag)")
            return
        }

        index = index + 1
        len = bd.getByte(index).intValue
        if len == 0 {
            print("Expected length > 0")
            return
        }

        index = index + 1
        // Tags 8 and 9 contain binary data.
        if expectedTag >= 8 {
            tagValue = bd.getEncodedChunk(index, numBytes: len, encoding: "base64")
        }
        else {
            tagValue = bd.getTextChunk(index, numBytes: len, charset: "utf-8")
        }

        print("tag \(tag): \(tagValue!)")

        index = index + len
        expectedTag = expectedTag + 1
    }


}