MimeKit.Parameter.EncodeRfc2231 C# (CSharp) Method

		void EncodeRfc2231 (FormatOptions options, StringBuilder builder, ref int lineLength, Encoding headerEncoding)
		{
			var bestEncoding = options.International ? CharsetUtils.UTF8 : GetBestEncoding (Value, encoding ?? headerEncoding);
			int maxLength = options.MaxLineLength - (Name.Length + 6);
			var charset = CharsetUtils.GetMimeCharset (bestEncoding);
			var encoder = (Encoder) bestEncoding.GetEncoder ();
			var bytes = new byte[Math.Max (maxLength, 6)];
			var hexbuf = new byte[bytes.Length * 3 + 3];
			var chars = Value.ToCharArray ();
			var hex = new HexEncoder ();
			int index = 0, i = 0;
			string value, id;
			bool encoded;
			int length;

			do {
				builder.Append (';');
				lineLength++;

				encoded = Rfc2231GetNextValue (options, charset, encoder, hex, chars, ref index, ref bytes, ref hexbuf, maxLength, out value);
				length = Name.Length + (encoded ? 1 : 0) + 1 + value.Length;

				if (i == 0 && index == chars.Length) {
					if (lineLength + 1 + length >= options.MaxLineLength) {
						builder.Append (options.NewLine);
						builder.Append ('\t');
						lineLength = 1;
					} else {
						builder.Append (' ');
						lineLength++;
					}

					builder.Append (Name);
					if (encoded)
						builder.Append ('*');
					builder.Append ('=');
					builder.Append (value);
					lineLength += length;
					return;
				}

				builder.Append (options.NewLine);
				builder.Append ('\t');
				lineLength = 1;

				id = i.ToString ();
				length += id.Length + 1;

				builder.Append (Name);
				builder.Append ('*');
				builder.Append (id);
				if (encoded)
					builder.Append ('*');
				builder.Append ('=');
				builder.Append (value);
				lineLength += length;
				i++;
			} while (index < chars.Length);
		}