Create new FileStream out of a byte array

Question

I am attempting to create a new FileStream object from a byte array. I\'m sure that made no sense at all so I will try to explain in further detail below.

Tasks I am

Answer 1

Since you don't know how many bytes you'll be reading from the GZipStream, you can't really allocate an array for it. You need to read it all into a byte array and then use a MemoryStream to decompress.

const int BufferSize = 65536;
byte[] compressedBytes = File.ReadAllBytes("compressedFilename");
// create memory stream
using (var mstrm = new MemoryStream(compressedBytes))
{
    using(var inStream = new GzipStream(mstrm, CompressionMode.Decompress))
    {
        using (var outStream = File.Create("outputfilename"))
        {
            var buffer = new byte[BufferSize];
            int bytesRead;
            while ((bytesRead = inStream.Read(buffer, 0, BufferSize)) != 0)
            {
                outStream.Write(buffer, 0, bytesRead);
            }  
        }
    }
}