class BufferFile : File
    {

        byte[] buffer;
        int index = 0;
        BufferFile(String name, int N) : base(name)
        {
            buffer = new byte[N];
        }

        public override void write(byte b) //Zapisuje jeden byte do buffer'a
        {
            buffer[index++] = b;
            if (index == buffer.Length) writeBuffer();
        }


        public void writeBuffer() //Zapisuje cały buffer do pliku
        {
            for(int n = 0; n < index; n++) //Zapisz tylko od początku do index - 1
            {
                write(buffer[n]);
            }
            index = 0;
        }
    }