using System.IO;

 using System.IO.Compression;

 using System.Text;

 namespace CS.Utility

 {

     /// <summary>

     /// 压缩与解压缩处理

     /// </summary>

     public static class Compressor

     {

         /// <summary>

         /// 压缩字符串

         /// </summary>

         /// <param name="str"></param>

         /// <returns></returns>

         public static byte[] Compress(string str)

         {

             var data = Encoding.UTF8.GetBytes(str);

             return Compress(data);

         }

         /// <summary>

         /// 压缩二进制流

         /// </summary>

         /// <param name="data"></param>

         /// <returns></returns>

         public static byte[] Compress(byte[] data)

         {

             using (var memoryStream = new MemoryStream())

             {

                 using (var compressionStream = new GZipStream(memoryStream, CompressionMode.Compress))

                 {

                     compressionStream.Write(data, , data.Length);

                     compressionStream.Flush();

                 }

                 //必须先关了compressionStream后才能取得正确的压缩流

                 return memoryStream.ToArray();

             }

         }

         /// <summary>

         /// 解压二进制流

         /// </summary>

         /// <param name="data"></param>

         /// <returns></returns>

         public static byte[] Depress(byte[] data)

         {

             using (var memoryStream = new MemoryStream(data))

             using (var outStream = new MemoryStream())

             {

                 using (var compressionStream = new GZipStream(memoryStream, CompressionMode.Decompress))

                 {

                     compressionStream.CopyTo(outStream);

                     compressionStream.Flush();

                 }

                 return outStream.ToArray();

             }

         }

     }

 }