www.pudn.com > MailAccess.rar > QuotedCoding.cs

/****************************************************************************** 
	Copyright 2003-2004 Hamid Qureshi and Unruled Boy  
	iOfficeMail.Net is free software; you can redistribute it and/or modify 
	it under the terms of the Lesser GNU General Public License as published by 
	the Free Software Foundation; either version 2 of the License, or 
	(at your option) any later version. 
 
	iOfficeMail.Net is distributed in the hope that it will be useful, 
	but WITHOUT ANY WARRANTY; without even the implied warranty of 
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
	Lesser GNU General Public License for more details. 
 
	You should have received a copy of the Lesser GNU General Public License 
	along with this program; if not, write to the Free Software 
	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
/*******************************************************************************/ 
 
/* 
*Name:			iOfficeMail.MIMEParser.QuotedCoding 
*Function:		Quoted Coding 
*Author:		Hamid Qureshi 
*Created:		2003/8 
*Modified:		2004/3 
*Description: 
*/ 
using System; 
using System.Text; 
 
namespace iOfficeMail.MIMEParser 
{ 
	/// 
 
	/// Summary description for Coding. 
	/// 
 
	public class QuotedCoding 
	{ 
		/// 
 
		/// zwraca tablice bajtow 
		/// zamienia 3 znaki np '=A9' na odp wartosc. 
		/// zamienia '_' na znak 32 
		/// 
 
		/// Kupis_Pawe=B3 
		/// Kupis Pawe?/returns> 
		public static byte[] GetByteArray(string s) 
		{ 
			byte[] buffer=new byte[s.Length]; 
 
			int bufferPosition=0; 
			if (s.Length>1) 
			{ 
				for(int i=0;i 
		/// Decoduje string "=?iso-8859-2?Q?Kupis_Pawe=B3?="  
		/// lub zakodowany base64 
		/// na poprawny 
		///  
		/// "=?iso-8859-2?Q?Kupis_Pawe=B3?=" 
		/// Kupis Pawe?/returns> 
		public static string DecodeOne(string s) 
		{ 
			char[] separator={'?'}; 
			string[] sArray=s.Split(separator); 
			if (sArray[0].Equals("=")==false) 
				return s; 
			 
			byte[] bArray; 
			//rozpoznaj rodzj kodowania 
			if (sArray[2].ToUpper()=="Q") //querystring 
				bArray=GetByteArray(sArray[3]); 
			else if (sArray[2].ToUpper()=="B")//base64 
				bArray=Convert.FromBase64String(sArray[3]); 
			else 
				return s; 
			//pobierz strone kodowa 
			Encoding encoding=Encoding.GetEncoding(sArray[1]);  
			return encoding.GetString(bArray); 
		} 
 
		/// 
 
		/// decoduje string zamienia wpisy (=?...?=) na odp wartosci 
		/// 
 
		/// "ala i =?iso-8859-2?Q?Kupis_Pawe=B3?= ma kota" 
		/// "ala i Pawe?Kupis ma kota" 
		public static string Decode(string s) 
		{ 
			StringBuilder retstring=new StringBuilder(); 
			int old=0,start=0,stop; 
			for(;;) 
			{ 
				start=s.IndexOf("=?",start); 
				if (start==-1) 
				{ 
					retstring.Append(s,old,s.Length-old); 
					return retstring.ToString(); 
				} 
				stop=s.IndexOf("?=",start+2); 
				if (stop==-1) //blad w stringu 
					return s; 
				retstring.Append(s,old,start-old); 
				retstring.Append(DecodeOne(s.Substring(start,stop-start+2))); 
				start=stop+2; 
				old=stop+2; 
			} 
		} 
 
	} 
}