Base64.txt

///   <summary> 
     ///  Base64编码类。
     ///  将byte[]类型转换成Base64编码的string类型。
     ///   </summary> 
     public   class  Base64Encoder
    {
         byte [] source;
         int  length, length2;
         int  blockCount;
         int  paddingCount;
         public   static  Base64Encoder Encoder  =   new  Base64Encoder();

         public  Base64Encoder()
        {
        }

         private   void  init( byte [] input)
        {
            source  =  input;
            length  =  input.Length;
             if  ((length  %   3 )  ==   0 )
            {
                paddingCount  =   0 ;
                blockCount  =  length  /   3 ;
            }
             else 
            {
                paddingCount  =   3   -  (length  %   3 );
                blockCount  =  (length  +  paddingCount)  /   3 ;
            }

            length2  =  length  +  paddingCount;
        }

         public   string  GetEncoded( byte [] input)
        {
             // 初始化 
            init(input);

             byte [] source2;
            source2  =   new   byte [length2];

             for  ( int  x  =   0 ; x  <  length2; x ++ )
            {
                 if  (x  <  length)
                {
                    source2[x]  =  source[x];
                }
                 else 
                {
                    source2[x]  =   0 ;
                }
            }

             byte  b1, b2, b3;
             byte  temp, temp1, temp2, temp3, temp4;
             byte [] buffer  =   new   byte [blockCount  *   4 ];
             char [] result  =   new   char [blockCount  *   4 ];
             for  ( int  x  =   0 ; x  <  blockCount; x ++ )
            {
                b1  =  source2[x  *   3 ];