public static List <DMETypePacketFragment> FromPayload(NetMessageTypes msgClass, byte msgType, byte[] payload, int index, int length)
{
List <DMETypePacketFragment> fragments = new List <DMETypePacketFragment>();
int i = 0;
while (i < length)
{
ushort subPacketSize = (ushort)(length - i);
if (subPacketSize > Constants.DME_FRAGMENT_MAX_PAYLOAD_SIZE)
{
subPacketSize = Constants.DME_FRAGMENT_MAX_PAYLOAD_SIZE;
}
var frag = new DMETypePacketFragment()
{
FragmentMessageClass = (byte)msgClass,
FragmentMessageType = msgType,
SubPacketSize = subPacketSize,
SubPacketCount = 0,
SubPacketIndex = (ushort)fragments.Count,
MultiPacketindex = 0,
PacketBufferSize = length,
PacketBufferOffset = i,
Payload = new byte[subPacketSize]
};
// Copy payload segment into fragment payload
Array.Copy(payload, i + index, frag.Payload, 0, subPacketSize);
//
fragments.Add(frag);
// Increment i
i += subPacketSize;
}
// Recorrect fragment counts
foreach (var frag in fragments)
{
frag.SubPacketCount = (ushort)fragments.Count;
}
return(fragments);
}
/// <summary>
/// Serializes the message.
/// </summary>
public List <byte[]> Serialize()
{
var results = new List <byte[]>();
byte[] result = null;
var buffer = new byte[1024 * 10];
int length = 0;
int totalHeaderSize = HEADER_SIZE;
// Serialize message
using (MemoryStream stream = new MemoryStream(buffer, true))
{
using (BinaryWriter writer = new BinaryWriter(stream))
{
Serialize(writer);
length = (int)writer.BaseStream.Position;
}
}
// Check for fragmentation
if (Id == RT_MSG_TYPE.RT_MSG_SERVER_APP && length > Constants.MEDIUS_MESSAGE_MAXLEN)
{
var msgClass = (NetMessageTypes)buffer[0];
var msgType = buffer[1];
var fragments = DMETypePacketFragment.FromPayload(msgClass, msgType, buffer, 2, length - 2);
foreach (var frag in fragments)
{
// Serialize message
using (MemoryStream stream = new MemoryStream(buffer, true))
{
using (BinaryWriter writer = new BinaryWriter(stream))
{
// Serialize header
writer.Write((byte)this.Id);
writer.Write((ushort)0);
// Serialize message
new RT_MSG_SERVER_APP()
{
Message = frag
}.Serialize(writer);
length = (int)stream.Position - totalHeaderSize;
// Write length
writer.Seek(1, SeekOrigin.Begin);
writer.Write((ushort)length);
result = new byte[length + totalHeaderSize];
Array.Copy(buffer, 0, result, 0, result.Length);
results.Add(result);
}
}
}
}
else
{
// Add id and length to header
result = new byte[length + totalHeaderSize];
result[0] = (byte)this.Id;
result[1] = (byte)(length & 0xFF);
result[2] = (byte)((length >> 8) & 0xFF);
Array.Copy(buffer, 0, result, totalHeaderSize, length);
results.Add(result);
}
return(results);
}