压缩解压

using  System;
using  System.Collections.Generic;
using  System.Text;
using  System.IO;
using  System.IO.Compression;

namespace  Framework
{
     public   class  CompressionHelper
    {
         public  CompressionHelper()
        {
           
        }

         public   static   byte [] CompressByte( byte [] bytes)
        {
            MemoryStream ms  =   new  MemoryStream();
            GZipStream s  =   new  GZipStream(ms, CompressionMode.Compress);
            s.Write(bytes,  0 , bytes.Length); 
            s.Close();
             return  ms.ToArray();
        }

         public   static   byte [] DeCompressByte( byte [] bytes)
        {
             byte [] writeData  =   new   byte [ 4096 ];
            MemoryStream ms  =   new  MemoryStream(bytes);
            Stream sm  =   new  GZipStream( new  MemoryStream(bytes), CompressionMode.Decompress);
            MemoryStream outStream  =   new  MemoryStream();
             while  ( true )
            {
                 int  size  =  sm.Read(writeData,  0 , writeData.Length );
                 if  (size  > 0 )
                {
                    outStream.Write(writeData,  0 , size);
                }
                 else
                {
                     break ;
                }
            }
            sm.Close();
             byte [] outArr  =  outStream.ToArray();
            outStream.Close();
             return  outArr;    
        }

         public   static   string  CompressString( string  data)
        {
             byte [] bytData  =  System.Text.Encoding.UTF8.GetBytes(data);
            MemoryStream ms  =   new  MemoryStream();
            Stream s  =   new  GZipStream(ms, CompressionMode.Compress);
            s.Write(bytData,  0 , bytData.Length);
            s.Close();
             byte [] compressedData  =  ( byte [])ms.ToArray();
             return  System.Convert.ToBase64String(compressedData,  0 , compressedData.Length);
        }

         public   static   string  DeCompressString( string  data)
        {
            System.Text.StringBuilder uncompressedString  =   new  System.Text.StringBuilder();
             byte [] writeData  =   new   byte [ 4096 ];

             byte [] bytData  =  System.Convert.FromBase64String(data);
             int  totalLength  =   0 ;
             int  size  =   0 ;

            Stream s  =   new  GZipStream( new  MemoryStream(bytData), CompressionMode.Decompress);
             while  ( true )
            {
                size  =  s.Read(writeData,  0 , writeData.Length);
                 if  (size  >   0 )
                {
                    totalLength  +=  size;
                    uncompressedString.Append(System.Text.Encoding.UTF8.GetString(writeData,  0 , size));
                }
                 else
                {
                     break ;
                }
            }
            s.Close();
             return  uncompressedString.ToString();
        }
    }
}