Проблемы с упаковкой

public static byte[] Pack(byte[] buf,int len)
{
    MemoryStream s0 = new MemoryStream(len+100000);
    s0.SetLength(0);
    s0.Seek(0,0);
    GZipStream s = new GZipStream(s0,CompressionMode.Compress, true);
    s.Write(buf,0,len);
    s.Close();
    byte[] bf = new byte[s0.Length];
    s0.Seek(0,0);
    int res=s0.Read(bf,0,(int)s0.Length);
    return bf;
}
       
public static byte[] UnPack(byte[] buf,int len)
{
    MemoryStream s0 = new MemoryStream(len);
    GZipStream s = new GZipStream(s0,CompressionMode.Decompress, true);
    s0.Write(buf,0,len);
    s0.Seek(0,SeekOrigin.Begin);
    s0.SetLength(len);
    byte[] bf = new byte[len*10];
    int l=s.Read(bf,0,(int)bf.Length);
    s.Close();
    byte[] bf2 = new byte[l];
    Buffer.BlockCopy(bf, 0, bf2, 0, l);
    return bf2;
}