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,
//                            System.Text.Encoding.Default.GetBytes(strfilename));
byte[] filename = System.Text.Encoding.Default.GetBytes(strfilename);

writer.Write(header, 0, header.Length);
writer.Write(filename, 0, filename.Length);
writer.WriteByte(0);  //文件名以0 字节结束
writer.Write(fielContent, 0, fielContent.Length); 

//关闭并释放内存流 
ms.Close(); 
ms.Dispose(); 

//关闭并释放文件流 
writer.Close(); 
writer.Dispose(); 
reader.Close(); 
reader.Dispose(); 


        }
    }
}