vs2005 GZipStream 压缩和解压缩

 压缩函数

 

            FileStream fs = new FileStream(@"E:/Heroes3.exe", FileMode.Open);
            FileStream DestnFile = File.Create(@"E:/a.exe");
          
            byte[] barr=new byte[fs.Length];
            fs.Read(barr, 0, barr.Length);
            GZipStream myGZip = new GZipStream(DestnFile, CompressionMode.Compress,true);
            myGZip.Write(barr, 0, barr.Length);
            myGZip.Dispose();
            DestnFile.Dispose();
            fs.Dispose();
            MessageBox.Show("finished!");

 

 

解压

 

 

 DecompressFile(@"E:/a.exe", @"E:/Heroes31.exe");

 

 public static void DecompressFile(string sourceFile, string destinationFile)
       {
         if (!File.Exists( sourceFile)) throw new FileNotFoundException();
       using (FileStream sourceStream = new FileStream(sourceFile, FileMode.Open))
         {
         byte [] quartetBuffer = new byte[4];
         int position = (int)sourceStream.Length - 4;
         sourceStream.Position = position;
         sourceStream.Read(quartetBuffer, 0, 4);
         sourceStream.Position = 0;
         int checkLength = BitConverter.ToInt32(quartetBuffer, 0);
         byte[] buffer = new byte[checkLength + 100];
           using (GZipStream decompressedStream = new GZipStream(sourceStream, CompressionMode.Decompress, true))
           {
             int total = 0;
           for (int offset = 0; ; )
           {
             int bytesRead = decompressedStream.Read(buffer, offset, 100);
             if (bytesRead == 0) break;
             offset += bytesRead;
             total += bytesRead;
           }
               using (FileStream destinationStream = new FileStream(destinationFile, FileMode.Create))
               {
                 destinationStream.Write(buffer, 0, total);
                 destinationStream.Flush();
               }
         }
       }
     }