Read the REST Response Body in Chunks

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Demonstrates Rest.ReadRespChunkBd, which reads the response body one chunk at a time, appending each chunk to a BinData. A return value of 0 signals the body is complete, while -1 indicates a read failure.

func chilkatTest() {
    var success: Bool = false

    let rest = CkoRest()!
    var bTls: Bool = true
    var bAutoReconnect: Bool = true
    success = rest.connect(hostname: "example.com", port: 443, tls: bTls, autoReconnect: bAutoReconnect)
    if success == false {
        print("\(rest.lastErrorText!)")
        return
    }

    success = rest.sendReqNoBody(httpVerb: "GET", uriPath: "/api/largefile")
    if success == false {
        print("\(rest.lastErrorText!)")
        return
    }

    var statusCode: Int = rest.readResponseHeader().intValue
    if statusCode < 0 {
        print("\(rest.lastErrorText!)")
        return
    }

    //  Read the response body in chunks, appending each chunk to the BinData.  Each call waits until at
    //  least the requested number of bytes is available, unless the response ends first.  A return value
    //  of 0 means the final bytes were returned and the body is complete; -1 indicates a read failure.
    let bdBody = CkoBinData()!
    var chunkResult: Int = rest.readRespChunkBd(minSize: 8192, bd: bdBody).intValue
    while chunkResult > 0 {
        chunkResult = rest.readRespChunkBd(minSize: 8192, bd: bdBody).intValue
    }

    if chunkResult < 0 {
        print("\(rest.lastErrorText!)")
        return
    }

    print("Received \(bdBody.numBytes.intValue) bytes.")

}