IMAP文件夹名称编码和解码方法代码,CSharp代码库,德仔网

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【CSharp】 IMAP文件夹名称编码和解码方法

作者:Dezai.CN / 发布于2013/10/22/ 455


	// 编码
	private string IMAPEncode(string folder)
	{
	 string rtn = "", base64;
	 int index = 0;
	 Regex regAsis = new Regex(@"\G(?:[\x20-\x25\x27-\x7e])+");
	 Regex reg26 = new Regex(@"\G&");
	 Regex regEncode = new Regex(@"\G(?:[^\x20-\x7e])+");
	 Regex regEq = new Regex(@"=+$");
	 Regex regSlash = new Regex(@"\/");
	 while (index < folder.Length) {
	 Match m;
	 m = regAsis.Match(folder, index);
	 if(m.Success)
	 {
	 index = index + m.Length;
	 rtn = rtn + m.Value;
	 continue;
	 }
	 m = reg26.Match(folder, index);
	 if(m.Success)
	 {
	 index = index + m.Length;
	 rtn = rtn + "&-";
	 continue;
	 }
	 m = regEncode.Match(folder, index);
	 if(m.Success)
	 {
	 index = index + m.Length;
	 base64 = Convert.ToBase64String(Encoding.GetEncoding("UTF-16BE").GetBytes(m.Value));
	 base64 = regEq.Replace(base64, "");
	 base64 = regSlash.Replace(base64, ",");
	 rtn = rtn + "&" + base64 + "-";
	 continue;
	 }
	 }
	 return rtn;
	}

	// 解码
	private string IMAPDeconde(string folder)
	{
	 string rtn = "", base64;
	 int index = 0;
	 Regex regAsis = new Regex(@"\G([^&]+)");
	 Regex reg26 = new Regex(@"\G\&-");
	 Regex regDecode = new Regex(@"\G\&([A-Za-z0-9+,]+)-?");
	 Regex regComma = new Regex(@",");
	 while (index < folder.Length) {
	 Match m;
	 m = regAsis.Match(folder, index);
	 if(m.Success)
	 {
	 index = index + m.Length;
	 rtn = rtn + m.Value;
	 continue;
	 }
	 m = reg26.Match(folder, index);
	 if(m.Success)
	 {
	 index = index + m.Length;
	 rtn = rtn + "&";
	 continue;
	 }
	 m = regDecode.Match(folder, index);
	 if(m.Success)
	 {
	 index = index + m.Length;
	 base64 = m.Value.Substring(1, m.Value.Length - 2);
	 base64 = regComma.Replace(base64, "/");
	 int mod = base64.Length % 4;
	 if(mod > 0 ) base64 = base64.PadRight(base64.Length + (4 - mod), '=');
	 base64 = Encoding.GetEncoding("UTF-16BE").GetString(Convert.FromBase64String(base64));
	 rtn = rtn + base64;
	 continue;
	 }
	 }
	 return rtn;
	}

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