Compress a string with LZFSE

lzfse_compress.swift

import Foundation
import Compression
import OSLog

// Compress JSON representation with the Apple recommended compression algo LZFSE
// https://developer.apple.com/documentation/compression/algorithm/lzfse
public func getCompressedJSON(from jsonString: String) -> Data {
    var sourceBuffer = Array(jsonString.utf8)
    let destinationBuffer = UnsafeMutablePointer<UInt8>.allocate(capacity: jsonString.count)
    let algorithm = COMPRESSION_LZFSE
    let compressedSize = compression_encode_buffer(destinationBuffer, jsonString.count,
                                                    &sourceBuffer, jsonString.count,
                                                    nil,
                                                    algorithm)
    if compressedSize == 0 {
        os_log("Encoding failed.")
    }
    
    return NSData(bytesNoCopy: destinationBuffer, length: compressedSize) as Data
}