QuotedCoding.cs
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上传日期:2022-08-09
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Email客户端
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C#
- /******************************************************************************
- 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>
- /// Summary description for Coding.
- /// </summary>
- public class QuotedCoding
- {
- /// <summary>
- /// zwraca tablice bajtow
- /// zamienia 3 znaki np '=A9' na odp wartosc.
- /// zamienia '_' na znak 32
- /// </summary>
- /// <param name="s">Kupis_Pawe=B3</param>
- /// <returns>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<s.Length;i++)
- {
- if (s[i]=='=')
- {
- if (s[i+1]=='r' && s[i+2]=='n')
- bufferPosition--;
- else
- buffer[bufferPosition]=System.Convert.ToByte(s.Substring(i+1,2),16);
- i+=2;
- }
- else if (s[i]=='_')
- buffer[bufferPosition]=32;
- else
- buffer[bufferPosition]=(byte)s[i];
- bufferPosition++;
- }
- }
- else
- {
- buffer[bufferPosition]=32;
- }
- byte[] newArray=new byte[bufferPosition];
- Array.Copy(buffer,newArray,bufferPosition);
- return newArray;
- }
- /// <summary>
- /// Decoduje string "=?iso-8859-2?Q?Kupis_Pawe=B3?="
- /// lub zakodowany base64
- /// na poprawny
- /// </summary>
- /// <param name="s">"=?iso-8859-2?Q?Kupis_Pawe=B3?="</param>
- /// <returns>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);
- }
- /// <summary>
- /// decoduje string zamienia wpisy (=?...?=) na odp wartosci
- /// </summary>
- /// <param name="s">"ala i =?iso-8859-2?Q?Kupis_Pawe=B3?= ma kota"</param>
- /// <returns>"ala i Pawe?Kupis ma kota"</returns>
- 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;
- }
- }
- }
- }