/// <summary>
/// Enumerates the message-id references such as those that can be found in
/// the In-Reply-To or References header.
/// </summary>
/// <remarks>
/// Incrementally parses Message-Ids (such as those from a References header
/// in a MIME message) from the supplied buffer starting at the given index
/// and spanning across the specified number of bytes.
/// </remarks>
/// <returns>The references.</returns>
/// <param name="buffer">The raw byte buffer to parse.</param>
/// <param name="startIndex">The index into the buffer to start parsing.</param>
/// <param name="length">The length of the buffer to parse.</param>
/// <exception cref="System.ArgumentNullException">
/// <paramref name="buffer"/> is <c>null</c>.
/// </exception>
/// <exception cref="System.ArgumentOutOfRangeException">
/// <paramref name="startIndex"/> and <paramref name="length"/> do not specify
/// a valid range in the byte array.
/// </exception>
public static IEnumerable <string> EnumerateReferences(byte[] buffer, int startIndex, int length)
{
ParseUtils.ValidateArguments(buffer, startIndex, length);
int endIndex = startIndex + length;
int index = startIndex;
do
{
if (!ParseUtils.SkipCommentsAndWhiteSpace(buffer, ref index, endIndex, false))
{
break;
}
if (index >= endIndex)
{
break;
}
if (buffer[index] == '<')
{
if (ParseUtils.TryParseMsgId(buffer, ref index, endIndex, true, false, out string msgid))
{
yield return(msgid);
}
}
else if (!ParseUtils.SkipWord(buffer, ref index, endIndex, false))
{
index++;
}
} while (index < endIndex);
yield break;
}
/// <summary>
/// Parses a Message-Id header value.
/// </summary>
/// <remarks>
/// Parses the Message-Id value, returning the addr-spec portion of the msg-id token.
/// </remarks>
/// <returns>The addr-spec portion of the msg-id token.</returns>
/// <param name="buffer">The raw byte buffer to parse.</param>
/// <param name="startIndex">The index into the buffer to start parsing.</param>
/// <param name="length">The length of the buffer to parse.</param>
/// <exception cref="System.ArgumentNullException">
/// <paramref name="buffer"/> is <c>null</c>.
/// </exception>
/// <exception cref="System.ArgumentOutOfRangeException">
/// <paramref name="startIndex"/> and <paramref name="length"/> do not specify
/// a valid range in the byte array.
/// </exception>
public static string ParseMessageId(byte[] buffer, int startIndex, int length)
{
ParseUtils.ValidateArguments(buffer, startIndex, length);
int endIndex = startIndex + length;
int index = startIndex;
string msgid;
ParseUtils.TryParseMsgId(buffer, ref index, endIndex, false, false, out msgid);
return(msgid);
}