ICSharpCode.SharpZipLib.Zip.Compression.Deflater.SetLevel C# (CSharp) Method

        public void SetLevel(int level)
        {
            if (level == DEFAULT_COMPRESSION) {
                level = 6;
            } else if (level < NO_COMPRESSION || level > BEST_COMPRESSION) {
                throw new ArgumentOutOfRangeException(nameof(level));
            }

            if (this.level != level) {
                this.level = level;
                engine.SetLevel(level);
            }
        }

        public byte[] Compress(byte[] input)
        {
            // Create the compressor with highest level of compression
            Deflater compressor = new Deflater();
            compressor.SetLevel(Deflater.BEST_COMPRESSION);

            // Give the compressor the data to compress
            compressor.SetInput(input);
            compressor.Finish();

            /*
             * Create an expandable byte array to hold the compressed data.
             * You cannot use an array that's the same size as the orginal because
             * there is no guarantee that the compressed data will be smaller than
             * the uncompressed data.
             */
            MemoryStream bos = new MemoryStream(input.Length);

            // Compress the data
            byte[] buf = new byte[1024];
            while (!compressor.IsFinished)
            {
                int count = compressor.Deflate(buf);
                bos.Write(buf, 0, count);
            }

            // Get the compressed data
            return bos.ToArray();
        }