using System.IO;
using System.IO.Compression;

namespace Helpers
{
    public class ZipHelper
    {
        public static byte[] Compress(byte[] input)
        {
            using (var output = new MemoryStream())
            using (var zip = new GZipStream(output, CompressionMode.Compress))
            {
                zip.Write(input, 0, input.Length);
                zip.Close();
                return output.ToArray();
            }
        }

        public static byte[] Decompress(byte[] gzip)
        {
            const int size = 4096;
            byte[] buffer = new byte[size];

            using (var zip = new GZipStream(new MemoryStream(gzip), CompressionMode.Decompress))
            using (var memory = new MemoryStream())
            {
                int count = 0;
                do
                {
                    count = zip.Read(buffer, 0, size);
                    if (count > 0)
                    {
                        memory.Write(buffer, 0, count);
                    }
                }
                while (count > 0);
                zip.Close();
                return memory.ToArray();
            }
        }
    }
}