private async Task <byte[]> ReadResponseAsync()
{
var remaining = 0;
var packetIndex = 0;
using (var response = new MemoryStream())
{
do
{
var packetData = await HIDDevice.ReadAsync();
var responseDataPacket = GetResponseDataPacket(packetData, packetIndex, ref remaining);
packetIndex++;
if (responseDataPacket == null)
{
return(null);
}
response.Write(responseDataPacket, 0, responseDataPacket.Length);
} while (remaining != 0);
return(response.ToArray());
}
}
private async Task <object> ReadResponseAsync()
{
var data = await HIDDevice.ReadAsync();
var firstByteNot63 = data[0] != (byte)'?';
var secondByteNot35 = data[1] != 35;
var thirdByteNot35 = data[2] != 35;
if (firstByteNot63 || secondByteNot35 || thirdByteNot35)
{
throw new Exception("An error occurred while attempting to read the message from the device.");
}
var typeInt = data[4];
if (!Enum.IsDefined(typeof(MessageType), (int)typeInt))
{
throw new Exception("Not a valid MessageType");
}
var messageType = (MessageType)Enum.Parse(typeof(MessageType), Enum.GetName(typeof(MessageType), typeInt));
var remainingDataLength = ((data[5] & 0xFF) << 24)
+ ((data[6] & 0xFF) << 16)
+ ((data[7] & 0xFF) << 8)
+ (data[8] & 0xFF);
var length = Math.Min(data.Length - (FirstChunkResponseIdx), remainingDataLength);
var allData = data.ToList().GetRange(FirstChunkResponseIdx, length);
remainingDataLength -= allData.Count;
var invalidChunksCounter = 0;
while (remainingDataLength > 0)
{
data = await HIDDevice.ReadAsync();
if (data.Length <= 0)
{
continue;
}
length = Math.Min(data.Length, remainingDataLength);
if (data[0] != (byte)'?')
{
if (invalidChunksCounter++ > 5)
{
throw new Exception("messageRead: too many invalid chunks (2)");
}
}
allData.InsertRange(allData.Count, data.ToList().GetRange(1, length - 1));
remainingDataLength -= (length - 1);
//Super hack! Fix this!
if (remainingDataLength != 1)
{
continue;
}
allData.InsertRange(allData.Count, data.ToList().GetRange(length, 1));
remainingDataLength = 0;
}
return(Helpers.ProtoBufDeserialize(GetContractType(messageType), allData.ToArray()));
}