(Swift 3,4,5...) Unzip an AES Encrypted Text File directly into a String Variable

A common need is to unzip from an AES encrypted Zip archive directly into a string variable, such that the unencrypted file never resides on disk, even temporarily. This example shows how to do it.

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

    let zip = CkoZip()!

    // This example opens a WinZip-compatible AES encrypted
    // .zip that contains a single file: hamlet.xml.

    // It decrypts and unzips hamlet.xml directly into a string
    // variable.
    zip.setPassword("secret")
    var success: Bool = zip.open("qa_data/hamlet.zip")
    if success != true {
        print("\(zip.lastErrorText!)")
        return
    }

    var entry: CkoZipEntry? = zip.getEntryByName("hamlet.xml")
    if zip.lastMethodSuccess == false {
        print("Failed to find entry in zip")
        return
    }

    // lineEndingBehavior:
    // 0 = leave unchanged.
    // 1 = convert all to bare LF's
    // 2 = convert all to CRLF's
    var lineEndingBehavior: Int = 0
    var srcCharset: String? = "utf-8"
    var xmlText: String? = entry!.unzip(toString: lineEndingBehavior, srcCharset: srcCharset)
    print("\(xmlText!)")
    entry = nil

}