(Swift 3,4,5...) File Read Blocks

Demonstrates how to read a file in fixed-size blocks (except for the very last block).

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func chilkatTest() {
    // Demonstrates how to read a file in blocks,
    // which can be useful when uploading to cloud storage
    // services such as Azure, S3, Google, etc.

    // For this example, we're simply writing the blocks
    // to an output file, and then checking to see if the
    // resulting file contents equals the original file contents.

    var dataBlock: NSData

    let facSrc = CkoFileAccess()!
    let facDest = CkoFileAccess()!

    var srcPath: String? = "qa_data/xml/hamlet.xml"
    var destPath: String? = "qa_output/hamletOut.xml"

    var success: Bool = facSrc.open(forRead: srcPath)
    success = facDest.open(forWrite: destPath)
    // Assuming success for the example..

    // How many 1024-byte blocks?  (Including 1 for the last partial block)
    var numBlocks: Int = facSrc.getNumBlocks(1024).intValue

    var i: Int = 0
    while (i < numBlocks) {
        dataBlock = facSrc.readBlock(i, blockSize: 1024)
        if facSrc.lastMethodSuccess != true {
            print("\(facSrc.lastErrorText!)")
            return
        }

        success = facDest.fileWrite(dataBlock)
        if success != true {
            print("\(facDest.lastErrorText!)")
            return
        }

        i = i + 1
    }

    facSrc.fileClose()
    facDest.fileClose()

    var bEqual: Bool = facSrc.fileContentsEqual(srcPath, path2: destPath)
    if bEqual != true {
        print("Something went wrong!")
        return
    }

    print("File successfully copied by blocks.")

}