public int Read(out Packet packet, out byte[] packet_data)
{
int packet_header_size = Marshal.SizeOf(typeof(Packet));
int packet_size = packet_header_size + 1024;
byte[] buffer = new byte[packet_size];
ErrorCode error_code;
int bytes_read;
error_code = Reader.Read(buffer, 0, buffer.Length, 100, out bytes_read);
if (error_code != ErrorCode.None)
{
throw new Exception(UsbDevice.LastErrorString);
}
if (bytes_read == 0)
{
throw new Exception(UsbDevice.LastErrorString);
}
byte[] packet_header_bytes = new byte[packet_header_size];
Array.Copy(buffer, packet_header_bytes, packet_header_size);
packet = Protocol.ByteArrayToStructure <Packet>(packet_header_bytes);
packet_data = new byte[packet.size];
Array.Copy(buffer, packet_header_size, packet_data, 0, packet.size);
return(bytes_read);
}
public static ProtocolDataType GetPacket(byte[] buffer)
{
return(Protocol.ByteArrayToStructure <ProtocolDataType>(buffer));
}
public static void GetCapability(GarminUnit garmin)
{
Packet p;
bool done = false;
p = Packet.CreatePacket(PacketType.Application, (ushort)Protocol.PacketID.ProductRequest, 0);
garmin.Write(Protocol.StructureToByteArray <Packet>(p));
byte[] packet_data;
while (!done && garmin.Read(out p, out packet_data) > 0)
{
switch (p.id)
{
case (ushort)Protocol.PacketID.ProductData:
byte[] pdt_array = new byte[4];
Array.Copy(packet_data, pdt_array, 4);
int pdt_descr_size = packet_data.Length - 4;
byte[] pdt_descr_array = new byte[pdt_descr_size];
Product pdt = Protocol.ByteArrayToStructure <Product>(pdt_array);
Array.Copy(packet_data, 4, pdt_descr_array, 0, pdt_descr_size);
garmin.SetProductType(pdt, System.Text.ASCIIEncoding.ASCII.GetString(pdt_descr_array));
break;
case (ushort)Protocol.PacketID.ExtProductData:
var extended_data = System.Text.ASCIIEncoding.ASCII.GetString(packet_data);
garmin.SetExtendedDescription(extended_data);
break;
case (ushort)Protocol.PacketID.ProtocolArray:
int size = packet_data.Length / 3;
ProtocolDataType[] data_types = new ProtocolDataType[size];
for (int i = 0; i < size; i++)
{
byte[] temp_buffer = new byte[3];
Array.Copy(packet_data, i * 3, temp_buffer, 0, 3);
data_types[i] = ProtocolDataType.GetPacket(temp_buffer);
}
int j = 0;
while (j < size)
{
switch (data_types[j].Tag)
{
case Tags.Phys_Prot_Id:
garmin.SetCapability("protocol.physical", data_types[j].data);
j++;
break;
case Tags.Link_Prot_Id:
garmin.SetCapability("protocol.link", data_types[j].data);
j++;
break;
case Tags.Appl_Prot_Id:
application_protocol app = data_types[j].GetApplicationProtocol();
List <garmin_datatype> phys = new List <garmin_datatype>();
for (++j; j < size; j++)
{
if (data_types[j].Tag != Tags.Data_Type_Id)
{
Protocol.AssignProtocols(garmin, app, phys);
break;
}
phys.Add(data_types[j].GetDataType());
}
break;
case Tags.Data_Type_Id:
// taken care of in application protocol section
break;
default:
j++;
break;
}
}
done = true;
break;
default:
break;
}
}
}