(Swift 2) Compress Text Feed to Binary

This example receives incoming text data in chunks, compresses as a stream, and accumulates the compressed binary data.

The purpose is to demonstrate the BeginCompressString, MoreCompressString, and EndCompressString methods.

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

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

    var success: Bool
    let compressedData = CkoBinData()
    var compressedBytes: NSData

    let compress = CkoCompression()
    compress.Algorithm = "deflate"
    compress.Charset = "utf-8"

    let sbIndex = CkoStringBuilder()

    var i: Int
    for i = 0; i <= 24; i++ {
        // Note: It is possible (and normal) for a BeginCompress* or MoreCompress* method to return
        // an empty string (or 0 bytes).  When this happens, the input data is not lost.  It will be flushed
        // in a subsequent call.
        sbIndex.Clear()
        sbIndex.AppendInt(i)
        if i == 0 {
            compressedBytes = compress.BeginCompressString(sbIndex.GetAsString())
        }
        else {
            compressedBytes = compress.MoreCompressString(sbIndex.GetAsString())
        }

        compressedData.AppendBinary(compressedBytes)
        compressedBytes = compress.MoreCompressString(": This is a line of data to be compressed...\r\n")
        compressedData.AppendBinary(compressedBytes)
    }

    // Flush any remaining output.
    compressedBytes = compress.EndCompressString()
    compressedData.AppendBinary(compressedBytes)

    // Show the compressed data in hex format:
    print("The hex encoded compressed text:")
    print("\(compressedData.GetEncoded("hex"))")

    // Now decompress in one call:
    compressedBytes = compressedData.GetBinary()
    var originalText: String? = compress.DecompressString(compressedBytes)
    print("\(originalText!)")

}