(Swift 2) Compress EBICS SignaturePubKeyOrderData XML

This example provides a note about how to compress the SignaturePubKeyOrderData XML for EBICS.

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func chilkatTest() {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // We have this XML to be compressed and then encoded in Base64.

    // <?xml version="1.0" encoding="UTF-8"?>
    // <SignaturePubKeyOrderData xmlns="http://www.ebics.org/S001" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.ebics.org/S001 http://www.ebics.org/S001/ebics_signature.xsd">
    // <SignaturePubKeyInfo>
    // <ds:X509Data>
    // <ds:X509IssuerSerial>
    // <ds:X509IssuerName>ABCDEF eID User</ds:X509IssuerName>
    // <ds:X509SerialNumber>153594950300874710199347185895388116050</ds:X509SerialNumber>
    // </ds:X509IssuerSerial>
    // <ds:X509Certificate>MIIJTzCC...xzKyukE=</ds:X509Certificate>
    // </ds:X509Data>
    // <PubKeyValue>
    // <ds:RSAKeyValue><ds:Modulus>zedQEG0gNItQRG17p7CwiSv/N9YUBOzswEnfNSiNirQgb0bfWWAvCXOg7057WTCBMxOe7AHE7rLTTQFRHY2AEqSV1fj8iL7i186XnGQOFjsdVP3LBLV319HhoUIugaZOC5AbnDouq2Femr53NDK4fqYVI6skrvNo9LO4+8IBRNtR8lQudG+ABHCqIkrNjai1pXrjfEhvyAhz0URhqP00i3AUGD3BasM28uFhcNztqSfO/jp5xQOTAjSr2gCgwg9hJV5mVnOazwAEbWmKkW+NZGICrSdoyrJ+UKjbbhL6VI1woe2YufCYqYF0ec8bXdE9KlhHj+XjeaME3k/uBq22Kw==</ds:Modulus><ds:Exponent>AQAB</ds:Exponent></ds:RSAKeyValue>
    // <TimeStamp>2015-03-06T18:42:24.376+01:00</TimeStamp>
    // </PubKeyValue>
    // <SignatureVersion>A005</SignatureVersion>
    // </SignaturePubKeyInfo>
    // <PartnerID>XKB99999</PartnerID>
    // <UserID>XKB99999</UserID>
    // </SignaturePubKeyOrderData>  

    let fac = CkoFileAccess()
    var strXml: String? = fac.ReadEntireTextFile("qa_data/ebics/SignaturePubKeyOrderData.xml", charset: "utf-8")
    // Assuming the above statement succeeded...

    let compress = CkoCompression()

    // EBICS wants the deflate algorithm with the zlib header...
    compress.Algorithm = "zlib"
    compress.EncodingMode = "base64"

    var b64CompressedStr: String? = compress.CompressStringENC(strXml)

    print("\(b64CompressedStr!)")

}