(Swift 3,4,5...) Extract data:image/png;base64 from HTML

Demonstrates how to extract base64 image data from HTMl and save to files.

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func chilkatTest() {
    let sb = CkoStringBuilder()!
    let bd = CkoBinData()!
    let sbFilename = CkoStringBuilder()!
    var index: Int = 1

    var success: Bool = sb.loadFile("qa_data/html/oresp body.txt", charset: "utf-8")
    // Assume success.
    print("length = \(sb.length.intValue)")

    var mayHaveMore: Bool = true
    while mayHaveMore == true {

        // Get the base64 between the 1st occurrence "data:image/png;base64," and "'"
        var sBase64: String? = sb.getBetween("data:image/png;base64,", endMark: "'")

        // If nothing is found, then we'll exit the loop because there are no more.
        mayHaveMore = sb.lastMethodSuccess

        if sb.lastMethodSuccess == true {
            // Found something.
            // Load into bd and save.
            success = bd.loadEncoded(sBase64, encoding: "base64")

            sbFilename.setString("qa_output/png_")
            sbFilename.appendInt(index)
            sbFilename.append(".png")

            bd.writeFile(sbFilename.getAsString())

            // Replace "data:image/png;base64" with "data:image-png;base64" so the next iteration finds the next occurrence.
            sb.replaceFirst("data:image/png;base64", replacement: "data:image-png;base64")
        }

        index = index + 1
    }

    // Restore our replacements..
    var count: Int = sb.replace("data:image-png;base64", replacement: "data:image/png;base64").intValue

    print("All done.")

}