/// <summary>Retrieves a message header by its internal number (1..<see cref="ImapMailboxInfo.Exist" />).</summary>
/// <param name="number">The internal message number (1..<see cref="ImapMailboxInfo.Exist" />).</param>
/// <returns></returns>
/// <exception cref="System.ArgumentOutOfRangeException"></exception>
/// <exception cref="System.FormatException"></exception>
public Rfc822Message GetMessageHeader(int number)
{
if (number < 1)
{
throw new ArgumentOutOfRangeException(nameof(number));
}
while (true)
{
var answer = SendCommand("FETCH " + number + " BODY[HEADER]");
if (answer.Data.Length == 0)
{
continue;
}
var streamReader = answer.GetStreamReader(0);
var header = streamReader.ReadLine();
var size = int.Parse(header.Substring(header.LastIndexOf('{')).Unbox("{", "}", true));
var dataReader = answer.GetDataReader(header.Length + 2);
var messageData = dataReader.ReadBytes(size);
if (messageData.Length != size)
{
throw new FormatException();
}
var message = Rfc822Message.FromBinary(messageData);
return(message);
}
}
/// <summary>Retrieves a message by its internal number (1..<see cref="ImapMailboxInfo.Exist" />).</summary>
/// <param name="number">The internal message number (1..<see cref="ImapMailboxInfo.Exist" />).</param>
/// <returns></returns>
/// <exception cref="System.ArgumentOutOfRangeException"></exception>
public Rfc822Message GetMessage(int number)
{
if (number < 1)
{
throw new ArgumentOutOfRangeException(nameof(number));
}
var answer = SendCommand("FETCH " + number + " BODY[]");
var start = Array.IndexOf(answer.Data, (byte)'\n') + 1;
var end = Array.LastIndexOf(answer.Data, (byte)')') - 2;
var message = new byte[end - start];
Array.Copy(answer.Data, start, message, 0, end - start);
return(Rfc822Message.FromBinary(message));
}