/// <summary>
/// Enumerates the message-id references such as those that can be found in the In-Reply-To or References header.
/// </summary>
/// <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)
{
int endIndex = startIndex + length;
int index = startIndex;
InternetAddress addr;
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
if (startIndex < 0 || startIndex > buffer.Length)
{
throw new ArgumentOutOfRangeException("startIndex");
}
if (length < 0 || startIndex + length > buffer.Length)
{
throw new ArgumentOutOfRangeException("length");
}
do
{
if (!ParseUtils.SkipCommentsAndWhiteSpace(buffer, ref index, endIndex, false))
{
break;
}
if (index >= endIndex)
{
break;
}
if (buffer[index] == '<')
{
if (!InternetAddress.TryParseMailbox(buffer, startIndex, ref index, endIndex, "", 65001, false, out addr))
{
break;
}
yield return("<" + ((MailboxAddress)addr).Address + ">");
}
else if (!ParseUtils.Skip8bitWord(buffer, ref index, endIndex, false))
{
index++;
}
} while (index < endIndex);
yield break;
}
