Net压缩文件流

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Windows.Forms; 
using System.IO.Compression; 
using System.IO; 
 
namespace gzipfile 
{ 
    public partial class Form1 : Form 
    { 
        public Form1() 
        { 
            InitializeComponent(); 
        } 
 
        private void button1_Click(object sender, EventArgs e) 
        { 
  
 
 
//文件流   
FileStream reader;  
reader = File.Open("D:\\ddd.txt", FileMode.Open);  
FileStream writer;  
writer = File.Create("D:\\ddd.gz");  
 
//压缩相关的流   
MemoryStream ms = new MemoryStream();  
GZipStream zipStream = new GZipStream(ms, CompressionMode.Compress, true);  
 
//往压缩流中写数据   
byte[] sourceBuffer = new byte[reader.Length];  
 
 
reader.Read(sourceBuffer, 0, sourceBuffer.Length);  
zipStream.Write(sourceBuffer, 0, sourceBuffer.Length);  
 
//一定要在内存流读取之前关闭压缩流   
zipStream.Close();  
zipStream.Dispose();  
 
//从内存流中读数据   
ms.Position = 0; //注意，不要遗漏此句   
byte[] destBuffer = new byte[ms.Length];  
//ms.Read(destBuffer, 0, destBuffer.Length);   
 
byte[] header = new byte [10]; 
ms.Read(header, 0, 10); 
header[3] = 8;        //表示包含文件名信息  
byte[] fielContent  = new byte[ms.Length -10] ; 
ms.Read(fielContent, 0, fielContent.Length); 
 
string  strfilename = "widebright的文件.txt"; //指定初始文件名  
  
//byte   []  filename=System.Text.Encoding.Convert(System.Text.Encoding.Default,  
//                          //  System.Text.Encoding.GetEncoding("ISO-8859-1"),  
//                           System.Text.Encoding.Default,