(Swift) Replace/Update a FIle in a .zip

Demonstrates how to replace/update a file from a .zip. Note: This requires the entire .zip to be rewritten.

Note: This example requires Chilkat v11.0.0 or greater.

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func chilkatTest() {
    var success: Bool = false

    // This requires the Chilkat Zip API to have been previously unlocked.
    // See Unlock Chilkat Zip for sample code.

    // First prepare a .zip and write it..
    let zip = CkoZip()!

    zip.newZip("qa_output/abc.zip")

    // Add some files..
    var charset: String? = "utf-8"
    zip.addString("a.txt", content: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", charset: charset)
    zip.addString("b.txt", content: "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb", charset: charset)
    zip.addString("c.txt", content: "cccccccccccccccccccccccccccccccccccc", charset: charset)

    // Write to qa_output/abc.zip
    // This .zip contains three files: a.txt, b.txt, and c.txt
    success = zip.writeAndClose()

    // -------------------------------------------------------------------
    // Open abc.zip, replace the content of the "b.txt" entry with something else, and re-write.
    let zip2 = CkoZip()!
    zip2.open("qa_output/abc.zip")

    let entry = CkoZipEntry()!
    if zip2.entry(of: "b.txt", entry: entry) == true {
        entry.replace("This is the new content.  bbbbbbbbbbbbbbbbbbbbbb", charset: "utf-8")
    }

    // Write the modified .zip back to "abc.zip"
    success = zip2.writeAndClose()

    print("success.")

}