using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using ICSharpCode.SharpZipLib.Zip;
using ICSharpCode.SharpZipLib.Checksums;
using System.Security.Cryptography;
namespace zip壓縮與解壓
{
 public class ZipHelper
 {
  /// <summary>
  /// 壓縮單個(gè)文件
  /// </summary>
  /// <param name="fileToZip">需壓縮的文件名</param>
  /// <param name="zipFile">壓縮后的文件名（文件名都是絕對(duì)路徑）</param>
  /// <param name="level">壓縮等級(jí)（0-9）</param>
  /// <param name="password">壓縮密碼（解壓是需要的密碼）</param>
  public static void ZipFile(string fileToZip, string zipFile, int level = 5, string password = "123")
  {
   if (!File.Exists(fileToZip))
    throw new FileNotFoundException("壓縮文件" + fileToZip + "不存在");
   using (FileStream fs = File.OpenRead(fileToZip))
   {
    fs.Position = 0;//設(shè)置流的起始位置
    byte[] buffer = new byte[(int)fs.Length];
    fs.Read(buffer, 0, buffer.Length);//讀取的時(shí)候設(shè)置Position，寫入的時(shí)候不需要設(shè)置
    fs.Close();
    using (FileStream zfstram = File.Create(zipFile))
    {
     using (ZipOutputStream zipstream = new ZipOutputStream(zfstram))
     {
      zipstream.Password = md5(password);//設(shè)置屬性的時(shí)候在PutNextEntry函數(shù)之前
      zipstream.SetLevel(level);
      string fileName = fileToZip.Substring(fileToZip.LastIndexOf('\\') + 1);
      ZipEntry entry = new ZipEntry(fileName);
      zipstream.PutNextEntry(entry);
      zipstream.Write(buffer, 0, buffer.Length);
     }
    }
   }
  }
  /// <summary>
  /// 壓縮多個(gè)文件目錄
  /// </summary>
  /// <param name="dirname">需要壓縮的目錄</param>
  /// <param name="zipFile">壓縮后的文件名</param>
  /// <param name="level">壓縮等級(jí)</param>
  /// <param name="password">密碼</param>
  public static void ZipDir(string dirname, string zipFile, int level = 5, string password = "123")
  {
   ZipOutputStream zos = new ZipOutputStream(File.Create(zipFile));
   zos.Password = md5(password);
   zos.SetLevel(level);
   addZipEntry(dirname, zos, dirname);
   zos.Finish();
   zos.Close();
  }
  /// <summary>
  /// 往壓縮文件里面添加Entry
  /// </summary>
  /// <param name="PathStr">文件路徑</param>
  /// <param name="zos">ZipOutputStream</param>
  /// <param name="BaseDirName">基礎(chǔ)目錄</param>
  private static void addZipEntry(string PathStr, ZipOutputStream zos, string BaseDirName)
  {
   DirectoryInfo dir = new DirectoryInfo(PathStr);
   foreach (FileSystemInfo item in dir.GetFileSystemInfos())
   {
    if ((item.Attributes & FileAttributes.Directory) == FileAttributes.Directory)//如果是文件夾繼續(xù)遞歸
    {
     addZipEntry(item.FullName, zos, BaseDirName);
    }
    else
    {
     FileInfo f_item = (FileInfo)item;
     using (FileStream fs = f_item.OpenRead())
     {
      byte[] buffer = new byte[(int)fs.Length];
      fs.Position = 0;
      fs.Read(buffer, 0, buffer.Length);
      fs.Close();
      ZipEntry z_entry = new ZipEntry(item.FullName.Replace(BaseDirName, ""));
      zos.PutNextEntry(z_entry);
      zos.Write(buffer, 0, buffer.Length);
     }
    }
   }
  }
  /// <summary>
  /// 解壓多個(gè)文件目錄
  /// </summary>
  /// <param name="zfile">壓縮文件絕對(duì)路徑</param>
  /// <param name="dirname">解壓文件目錄</param>
  /// <param name="password">密碼</param>
  public static void UnZip(string zfile, string dirname, string password)
  {
   if (!Directory.Exists(dirname)) Directory.CreateDirectory(dirname);
   using (ZipInputStream zis = new ZipInputStream(File.OpenRead(zfile)))
   {
    zis.Password = md5(password);
    ZipEntry entry;
    while ((entry = zis.GetNextEntry()) != null)
    {
     var strArr = entry.Name.Split('\\');//這邊判斷壓縮文件里面是否存在目錄，存在的話先創(chuàng)建目錄后繼續(xù)解壓
     if (strArr.Length > 2)  
      Directory.CreateDirectory(dirname + @"\" + strArr[1]);
     using (FileStream dir_fs = File.Create(dirname + entry.Name))
     {
      int size = 1024 * 2;
      byte[] buffer = new byte[size];
      while (true)
      {
       size = zis.Read(buffer, 0, buffer.Length);
       if (size > 0)
        dir_fs.Write(buffer, 0, size);
       else
        break;
      }
     }
    }
   }
  }
  private static string md5(string pwd)
  {
   var res = "";
   MD5 md = MD5.Create();
   byte[] s = md.ComputeHash(Encoding.Default.GetBytes(pwd));
   for (int i = 0; i < s.Length; i++)
    res = res + s[i].ToString("X");
   return res;
  }
 }
}

static void Main(string[] args)
  {
   var str = @"\學(xué)籍導(dǎo)入模板.xls";
   //var arr=str.Split('\\');
   var filePath = @"D:\程序文件\VS2010學(xué)習(xí)\StudyProgram\zip壓縮與解壓\File\學(xué)籍導(dǎo)入模板.xls";
   //ZipHelper.ZipFile(filePath, @"D:\程序文件\VS2010學(xué)習(xí)\StudyProgram\zip壓縮與解壓\File\test.zip", 6, "123");
   var dirPath = @"D:\程序文件\VS2010學(xué)習(xí)\StudyProgram\zip壓縮與解壓";
   //ZipHelper.ZipDir(dirPath + @"\File", dirPath + @"\File.zip", 6, "huage");
   ZipHelper.UnZip(dirPath + @"\File.zip", dirPath + @"\test", "huage");
   Console.ReadKey();
  }