public static async Task <TravelCard> ReadTravelCard(ISmartCard card)
{
using (ISmartCardConnection connection = await card.Connect())
{
try
{
byte[] selection = await connection.Transcieve(Commands.SelectHslCommand);
if (selection != null &&
selection.Length > 0 &&
selection.SequenceEqual(Commands.OkResponse))
{
// Travel card info bytes
byte[] appInfo = null;
byte[] controlInfo = null;
byte[] periodPass = null;
byte[] storedValue = null;
byte[] eTicket = null;
byte[] history = null;
// Temporary containers for history chunks
byte[] hist1 = new byte[2];
byte[] hist2 = new byte[2];
appInfo = await connection.Transcieve(Commands.ReadAppInfoCommand);
controlInfo = await connection.Transcieve(Commands.ReadControlInfoCommand);
periodPass = await connection.Transcieve(Commands.ReadPeriodPassCommand);
storedValue = await connection.Transcieve(Commands.ReadStoredValueCommand);
eTicket = await connection.Transcieve(Commands.ReadETicketCommand);
hist1 = await connection.Transcieve(Commands.ReadHistoryCommand);
// If we have more history, the last two bytes of the history array will contain the MORE_DATA bytes.
if (hist1.Skip(Math.Max(0, hist1.Length - 2)).ToArray() == Commands.MoreDataResponse)
{
hist2 = await connection.Transcieve(Commands.ReadNextCommand);
}
// Combine the two history chunks into a single array, minus their last two MORE_DATA bytes
history = hist1.Take(hist1.Length - 2)
.Concat(hist2.Take(hist2.Length - 2))
.ToArray();
return(TravelCard.CreateTravelCard(appInfo, controlInfo, periodPass, storedValue, eTicket, history));
}
else
{
Debug.WriteLine($"Failed to read travel card. Did not received OK_RESPONSE when trying to select the HSL application.");
return(null);
}
}
catch (Exception ex)
{
Debug.WriteLine($"Failed to read card. Exception: {ex}");
return(null);
}
}
}
