Large memory consumption

[ras254]

Hi
I tried to unpack a large msdf file (about 500 Mb) and got large memory consumption (about 6-8 Gb).
I think what this because a new byte[] operation take place many times.

Can you made some changes like this:
Sector.cs - add function

       public void GetData(byte[] buffer, int offset, int length)
        {
            if (IsStreamed)
            {
                stream.Seek((long)size + (long)this.id * (long)size, SeekOrigin.Begin);
                stream.Read(buffer, offset, Math.Min(size, length));
            }
        }

And use it at the StreamView.cs (function int Read(byte[] buffer, int offset, int count)) instead of sectorChain[secIndex].GetData() function

Thanks