c# gzipstream decompression is more like depression...

Question

final working code is here....

    public static byte[] ToGZip( this string source )
    {
        using( var stream = new MemoryStream( ) )
        {
            using( var compressor = new GZipStream( stream, CompressionMode.Compress ) )
            {
                var bytes = System.Text.UTF8Encoding.UTF8.GetBytes( source );

                compressor.Write( bytes, 0, bytes.Length );
            }

            return stream.ToArray( );
        }
    }

    public static string FromGZipToString( this byte[] source )
    {
        using( MemoryStream stream = new MemoryStream( ) )
        {
            stream.Write( source, 0, source.Length );

            stream.Seek(0, SeekOrigin.Begin);

            using (var gzipstream = new GZipStream(stream, CompressionMode.Decompress))
            using (var reader = new StreamReader(gzipstream)) 
            {
                return reader.ReadToEnd( );
            }
        }
    }

seekorigin code can be found here:

http://social.msdn.microsoft.com/forums/en-US/netfxbcl/thread/6d207e3d-ee4b-4780-80dd-bf1a278a57cd

Answer 1

Your compression routine is faulty. It shouldn't be reading from stream until the compressor has been closed (or disposed), allowing the compressor to finish writing all bytes to the steam.

Check out my answer to this question: http://stackoverflow.com/questions/3848021/compressing-and-decompressing-source-data-gives-result-different-than-source-data/3848034#3848034