Using Gzip to compress/decompress an array of bytes
<p>I need to compress an array of bytes. So I wrote this snippet :</p>

<pre><code> class Program
    {
        static void Main()
        {
            var test = "foo bar baz";

            var compressed = Compress(Encoding.UTF8.GetBytes(test));
            var decompressed = Decompress(compressed);
            Console.WriteLine("size of initial table = " + test.Length);
            Console.WriteLine("size of compressed table = " + compressed.Length);
            Console.WriteLine("size of  decompressed table = " + decompressed.Length);
            Console.WriteLine(Encoding.UTF8.GetString(decompressed));
            Console.ReadKey();
        }

        static byte[] Compress(byte[] data)
        {
            using (var compressedStream = new MemoryStream())
            using (var zipStream = new GZipStream(compressedStream, CompressionMode.Compress))
            {
                zipStream.Write(data, 0, data.Length);
                zipStream.Close();
                return compressedStream.ToArray();
            }
        }

        static byte[] Decompress(byte[] data)
        {
            using (var compressedStream = new MemoryStream(data))
            using (var zipStream = new GZipStream(compressedStream, CompressionMode.Decompress))
            using (var resultStream = new MemoryStream())
            {
                zipStream.CopyTo(resultStream);
                return resultStream.ToArray();
            }
        }
    }
</code></pre>

<p>The problem is that I get this output :</p>

<p><a href="https://i.stack.imgur.com/xFGQs.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/xFGQs.jpg" alt="output"></a></p>

<p>I don't understand why the size of the compressed array is greater than the decompressed one !</p>

<p>Any ideas?</p>

<p><strong>Edit</strong></p>

<p>after @spender's comment: if I change <code>test</code> string for example :</p>

<pre><code>var test = "foo bar baz very long string for example hdgfgfhfghfghfghfghfghfghfghfghfghfghfhg";
</code></pre>

<p>I get different result. So what is the minimum size of the initial array to be compressed ? </p>