zip.cs

北大青鸟内部资料

using System;
using System.IO;


namespace Compression
{
	using ICSharpCode.SharpZipLib.Checksums;
	using ICSharpCode.SharpZipLib.Zip;
	using ICSharpCode.SharpZipLib.GZip;

	
	public class Zip
	{
		private int _compressionLevel = 1;
		private int _blockSize = 2048;

		/// <summary>
		/// 构造函数
		/// </summary>
		/// <param name="CompressionLevel">压缩级别</param>
		/// <param name="BlockSize">块大小</param>
		public Zip(int CompressionLevel, int BlockSize)
		{
			_compressionLevel = CompressionLevel;
			_blockSize = BlockSize;
		}		

 
		public void ZipDirectory(string SourcePath, string TargetFile)
		{
			string[] filenames = Directory.GetFiles(SourcePath);
  
			Crc32 crc = new Crc32();
			ZipOutputStream s = new ZipOutputStream(File.Create(TargetFile));
  
			s.SetLevel(6); // 0 - store only to 9 - means best compression
  
			foreach (string file in filenames) 
			{
				//打开压缩文件
				FileStream fs = File.OpenRead(file);
   
				byte[] buffer = new byte[fs.Length];
				fs.Read(buffer, 0, buffer.Length);
				ZipEntry entry = new ZipEntry(file);
   
				entry.DateTime = DateTime.Now;
   
				// set Size and the crc, because the information
				// about the size and crc should be stored in the header
				// if it is not set it is automatically written in the footer.
				// (in this case size == crc == -1 in the header)
				// Some ZIP programs have problems with zip files that don't store
				// the size and crc in the header.
				entry.Size = fs.Length;
				fs.Close();
   
				crc.Reset();
				crc.Update(buffer);
   
				entry.Crc  = crc.Value;
   
				s.PutNextEntry(entry);
   
				s.Write(buffer, 0, buffer.Length);
   
			}
  
			s.Finish();
			s.Close();
		}
	}
}