/// <summary>
/// Reads the travel card data from HSL Mifare DESFire card.
/// </summary>
/// <param name="card">The card to try to read.</param>
/// <returns>A deserialized Travel Card object if the card was valid, otherwise null.</returns>
public static async Task <TravelCard> ReadTravelCardAsync(SmartCard card)
{
using (SmartCardConnection connection = await card.ConnectAsync())
{
byte[] selection = (await connection.TransmitAsync(HslCommands.SelectHslCommand.AsBuffer())).ToArray();
if (selection != null &&
selection.Length > 0 &&
selection.SequenceEqual(HslCommands.OkResponse))
{
// Travel card info bytes
byte[] appInfo = 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.TransmitAsync(HslCommands.ReadAppInfoCommand.AsBuffer())).ToArray();
periodPass = (await connection.TransmitAsync(HslCommands.ReadPeriodPassCommand.AsBuffer())).ToArray();
storedValue = (await connection.TransmitAsync(HslCommands.ReadStoredValueCommand.AsBuffer())).ToArray();
eTicket = (await connection.TransmitAsync(HslCommands.ReadETicketCommand.AsBuffer())).ToArray();
hist1 = (await connection.TransmitAsync(HslCommands.ReadHistoryCommand.AsBuffer())).ToArray();
// 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() == HslCommands.MoreData)
{
hist2 = (await connection.TransmitAsync(HslCommands.ReadNextCommand.AsBuffer())).ToArray();
}
// 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();
var rawCard = new RawTravelCard(appInfo, periodPass, storedValue, eTicket, history);
if (rawCard.Status == CardStatus.HslCardDataFailure)
{
return(null);
}
else
{
return(new TravelCard(rawCard));
}
}
else
{
return(null);
}
}
}
/// <summary>
/// Reads the travel card data from HSL Mifare DESFire card.
/// </summary>
/// <param name="card">The card to try to read.</param>
/// <returns>A deserialized Travel Card object if the card was valid, otherwise null.</returns>
public static async Task <TravelCard> ReadTravelCardAsync(IsoDep card)
{
try
{
card.Connect();
byte[] selection = card.Transceive(HslCommands.SelectHslCommand);
if (selection != null &&
selection.Length > 0 &&
selection.SequenceEqual(HslCommands.OkResponse))
{
// Travel card info bytes
byte[] appInfo = 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 card.TransceiveAsync(HslCommands.ReadAppInfoCommand);
periodPass = await card.TransceiveAsync(HslCommands.ReadPeriodPassCommand);
storedValue = await card.TransceiveAsync(HslCommands.ReadStoredValueCommand);
eTicket = await card.TransceiveAsync(HslCommands.ReadETicketCommand);
hist1 = await card.TransceiveAsync(HslCommands.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() == HslCommands.MoreData)
{
hist2 = await card.TransceiveAsync(HslCommands.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();
var rawCard = new RawTravelCard(appInfo, periodPass, storedValue, eTicket, history);
if (rawCard.Status == CardStatus.HslCardDataFailure)
{
System.Diagnostics.Debug.WriteLine("Failed to construct travel card. Data appears to be invalid.");
return(null);
}
else
{
return(new TravelCard(rawCard));
}
}
else
{
System.Diagnostics.Debug.WriteLine("Failed to construct travel card. This doesn't seem to be an HSL Travel card.");
return(null);
}
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine("Failed to construct travel card. Reason: " + ex.ToString() + ".\nStack trace:" + ex.StackTrace);
return(null);
}
finally
{
card.Close();
}
}
