C # Quoted-Printable encoding and decoding

Copy codeThe Code is as follows: # using System;
# Using System. Collections;
# Using System. Text;
#
# // <Summary>
# // Class for encoding and decoding a string to QuotedPrintable
# // RFC 1521 http://www.ietf.org/rfc/rfc1521.txt
# // RFC 2045 http://www.ietf.org/rfc/rfc2045.txt
# // Date: 2006-03-23
# // Author: Kevin Spaun
# // Company: SPAUN Informationstechnik GmbH-http://www.spaun-it.com/
# // Feedback: kspaun@spaun-it.de
# // License: This piece of code comes with no guaranties. You can use it for whatever you want for free.
#///
# // Modified by Will Huang (http://blog.miniasp.com/post/2008/02/14/Quoted-Printable-Encoding-and-Decoding.aspx)
# // Modified at 2008-02-13
#///
# // Modified by reterry (http://www.jb51.net)
# // Modified
# // Modified for MySelf
#///
# // </Summary>
# Public class QuotedPrintable
#{
# Private const byte EQUALS = 61;
# Private const byte CR = 13;
# Private const byte LF = 10;
# Private const byte SPACE = 32;
# Private const byte TAB = 9;
#
# // <Summary>
# // Encodes a string to QuotedPrintable
# // </Summary>
# // <Param name = "_ ToEncode"> String to encode </param>
# // <Returns> QuotedPrintable encoded string </returns>
# Public static string Encode (string _ ToEncode)
#{
# StringBuilder Encoded = new StringBuilder ();
# String hex = string. Empty;
# // Byte [] bytes = Encoding. Default. GetBytes (_ ToEncode );
# Byte [] bytes = Encoding. UTF8.GetBytes (_ ToEncode );
# // Int count = 0;
#
# For (int I = 0; I <bytes. Length; I ++)
#{
# // These characters must be encoded
# If (bytes [I] <33 | bytes [I]> 126 | bytes [I] = EQUALS) & bytes [I]! = CR & bytes [I]! = LF & bytes [I]! = SPACE)
#{
# If (bytes [I]. ToString ("X"). Length <2)
#{
# Hex = "0" + bytes [I]. ToString ("X ");
# Encoded. Append ("=" + hex );
#}
# Else
#{
# Hex = bytes [I]. ToString ("X ");
# Encoded. Append ("=" + hex );
#}
#}
# Else
#{
# // Check if index out of range
# If (I + 1) <bytes. Length)
#{
# // If TAB is at the end of the line-encode it!
# If (bytes [I] = TAB & bytes [I + 1] = LF) | (bytes [I] = TAB & bytes [I + 1] = CR ))
#{
# Encoded. Append ("= 0" + bytes [I]. ToString ("X "));
#}
# // If SPACE is at the end of the line-encode it!
# Else if (bytes [I] = SPACE & bytes [I + 1] = LF) | (bytes [I] = SPACE & bytes [I + 1] = CR ))
#{
# Encoded. Append ("=" + bytes [I]. ToString ("X "));
#}
# Else
#{
# Encoded. Append (System. Convert. ToChar (bytes [I]);
#}
#}
# Else
#{
# Encoded. Append (System. Convert. ToChar (bytes [I]);
#}
#}
# // If (count = 75)
#//{
# // Encoded. Append ("= \ r \ n"); // insert soft-linebreak
# // Count = 0;
#//}
# // Count ++;
#}
#
# Return Encoded. ToString ();
#}
#
# // <Summary>
# // Decodes a QuotedPrintable encoded string
# // </Summary>
# // <Param name = "_ ToDecode"> The encoded string to decode </param>
# // <Returns> Decoded string </returns>
# Public static string Decode (string _ ToDecode)
#{
# // Remove soft-linebreaks first
# // _ ToDecode = _ ToDecode. Replace ("= \ r \ n ","");
#
# Char [] chars = _ ToDecode. ToCharArray ();
#
# Byte [] bytes = new byte [chars. Length];
#
# Int bytesCount = 0;
#
# For (int I = 0; I <chars. Length; I ++)
#{
# // If encoded character found decode it
# If (chars [I] = ')
#{
# Bytes [bytesCount ++] = System. convert. toByte (int. parse (chars [I + 1]. toString () + chars [I + 2]. toString (), System. globalization. numberStyles. hexNumber ));
#
# I + = 2;
#}
# Else
#{
# Bytes [bytesCount ++] = System. Convert. ToByte (chars [I]);
#}
#}
#
# // Return System. Text. Encoding. Default. GetString (bytes, 0, bytesCount );
# Return System. Text. Encoding. UTF8.GetString (bytes, 0, bytesCount );
#}
#}