using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            byte[] buff = null;
            FileStream fs = new FileStream("D:\\r.mp3.out.gz",
                                           FileMode.Open,
                                           FileAccess.Read);
            BinaryReader br = new BinaryReader(fs);
            long numBytes = new FileInfo("D:\\r.mp3.out.gz").Length;
            buff = br.ReadBytes(10);

            byte flags = buff[3];

            byte MASK_ASCII = 0xFF;
            byte MASK_FTEXT = 0x01;
            byte MASK_FHCRC = 0x02;
            byte MASK_FEXTRA = 0x04;
            byte MASK_FNAME = 0x08;
            byte MASK_FCOMMENT = 0x10;

            if ((flags & MASK_FNAME) != 0)
            {
                //blah
                while (br.ReadChar() != 0)
                {

                }
            }

            if ((flags & MASK_FCOMMENT) != 0)
            {
                char c;
                while ((c = br.ReadChar()) != 0)
                {
                    System.Console.Write(c);
                }

                System.Console.WriteLine();
            }

            System.Console.WriteLine(buff[3]);
            System.Console.ReadLine();
            return;
        }
    }
}