MimeKit.MimeMessage.DkimWriteHeaders C# (CSharp) Method

		void DkimWriteHeaders (FormatOptions options, IList<string> fields, DkimCanonicalizationAlgorithm headerCanonicalizationAlgorithm, Stream stream)
		{
			var counts = new Dictionary<string, int> ();

			for (int i = 0; i < fields.Count; i++) {
				var headers = fields[i].StartsWith ("Content-", StringComparison.OrdinalIgnoreCase) ? Body.Headers : Headers;
				var name = fields[i].ToLowerInvariant ();
				int index, count, n = 0;

				if (!counts.TryGetValue (name, out count))
					count = 0;

				// Note: signers choosing to sign an existing header field that occurs more
				// than once in the message (such as Received) MUST sign the physically last
				// instance of that header field in the header block. Signers wishing to sign
				// multiple instances of such a header field MUST include the header field
				// name multiple times in the list of header fields and MUST sign such header
				// fields in order from the bottom of the header field block to the top.
				index = headers.LastIndexOf (name);

				// find the n'th header with this name
				while (n < count && --index >= 0) {
					if (headers[index].Field.Equals (name, StringComparison.OrdinalIgnoreCase))
						n++;
				}

				if (index < 0)
					continue;

				var header = headers[index];

				switch (headerCanonicalizationAlgorithm) {
				case DkimCanonicalizationAlgorithm.Relaxed:
					DkimWriteHeaderRelaxed (options, stream, header, false);
					break;
				default:
					DkimWriteHeaderSimple (options, stream, header, false);
					break;
				}

				counts[name] = ++count;
			}
		}