/// <summary>
/// Encodes the specified message.
/// </summary>
/// <param name="message">The message.</param>
/// <returns></returns>
public static byte[] Encode(Message message)
{
string header = string.Concat(
message.Version.ToString(),
":",
message.PacketNo.ToString(),
":",
message.SenderName,
":",
message.SenderHost,
":",
message.CommandNo.ToString(),
":"
);
List<byte> data = new List<byte>(Encoding.UTF8.GetByteCount(header) + message.AdditionalSection.Length);
data.AddRange(Encoding.UTF8.GetBytes(header));
data.AddRange(message.AdditionalSection);
if (message.HasAttachment)
{
data.Add((byte)0);
foreach (Attachment attachment in message.Attachments)
{
data.AddRange(Messager.TextEncoding.GetBytes(Attachment.Encode(attachment)));
data.Add((byte)'\a');
}
}
return data.ToArray();
}
/// <summary>
/// Decodes the specified data.
/// </summary>
/// <param name="data">The data.</param>
/// <param name="remoteEP">The remote end point.</param>
/// <returns></returns>
public static Message Decode(byte[] data, IPEndPoint remoteEP)
{
List<string> items = new List<string>(5);
int index = 0;
int count = 0;
for (int i = 0; i < data.Length; i++)
{
if (data[i] == ':')
{
items.Add(Encoding.UTF8.GetString(data, index, count));
count = 0;
index = i + 1;
if (items.Count == 5) break;
}
else
{
count++;
}
}
count = data.Length - index;
byte[] additional = new byte[count];
Array.Copy(data, index, additional, 0, count);
Message message = new Message();
if (items.Count >= 4)
{
int.TryParse(items[0], out message.Version);
int.TryParse(items[1], out message.PacketNo);
message.SenderName = items[2];
message.SenderHost = items[3];
message.CommandNo = uint.Parse(items[4]);
}
message.AdditionalSection = additional;
message.SenderIP = remoteEP;
if (message.HasAttachment)
{
index = Array.IndexOf<byte>(additional, 0);
if (index > -1)
{
index++;
count = additional.Length - index;
string attachment = Messager.TextEncoding.GetString(additional, index, count);
string[] files = attachment.Split('\a');
message.Attachments = new List<Attachment>(files.Length);
foreach (string file in files)
{
if (file.Contains(':'))
{
message.Attachments.Add(Attachment.Decode(file));
}
}
}
Array.Resize<byte>(ref message.AdditionalSection, index);
}
return message;
}