/// <summary>
/// Detects the ICC type by parsing, and analyzing the ATR
/// </summary>
/// <returns>
/// none
/// </returns>
private void DetectCardType()
{
try
{
AtrInformation = AtrParser.Parse(Atr);
if (AtrInformation != null && AtrInformation.HistoricalBytes.Length > 0)
{
DetectCard();
}
}
catch (Exception e)
{
Debug.WriteLine(e.Message + e.StackTrace);
}
}
/// <summary>
/// Main parser method that extract information about the ATR byte array
/// </summary>
/// <returns>
/// returns AtrInfo object if ATR is valid, null otherwise
/// </returns>
public static AtrInfo Parse(byte[] atrBytes)
{
if (atrBytes == null || atrBytes.Length < 1)
{
return(null);
}
var atrInfo = new AtrInfo();
var supportedProtocols = 0;
using (var reader = new BinaryReader(new MemoryStream(atrBytes)))
{
var initialChar = reader.ReadByte();
if (initialChar != (byte)AtrHeader.InitialHeader)
{
return(null);
}
var formatByte = reader.ReadByte();
var interfacePresence = (byte)(formatByte.HiNibble() << 4);
for (var i = 0; i < AtrInfo.MaximumAtrCodes; i++)
{
if ((interfacePresence & 0x10) != 0)
{
atrInfo.ProtocolInterfaceA[i] = reader.ReadByte();
}
if ((interfacePresence & 0x20) != 0)
{
atrInfo.ProtocolInterfaceB[i] = reader.ReadByte();
}
if ((interfacePresence & 0x40) != 0)
{
atrInfo.ProtocolInterfaceC[i] = reader.ReadByte();
}
if ((interfacePresence & 0x80) != 0)
{
atrInfo.ProtocolInterfaceD[i] = reader.ReadByte();
}
else
{
break;
}
interfacePresence = atrInfo.ProtocolInterfaceD[i];
supportedProtocols |= (1 << interfacePresence.LowNibble());
}
var buffer = new byte[formatByte.LowNibble()];
reader.Read(buffer, 0, buffer.Length);
atrInfo.HistoricalBytes = buffer;
if ((supportedProtocols & ~1) != 0)
{
atrInfo.TckValid = ValidateTCK(atrBytes);
}
return(atrInfo);
}
}
/// <summary>
/// Main parser method that extract information about the ATR byte array
/// </summary>
/// <returns>
/// returns AtrInfo object if ATR is valid, null otherwise
/// </returns>
public static AtrInfo Parse(byte[] atrBytes)
{
if (atrBytes == null || atrBytes.Length < 1)
return null;
var atrInfo = new AtrInfo();
var supportedProtocols = 0;
using (var reader = new BinaryReader(new MemoryStream(atrBytes)))
{
var initialChar = reader.ReadByte();
if (initialChar != (byte)AtrHeader.InitialHeader)
{
return null;
}
var formatByte = reader.ReadByte();
var interfacePresence = (byte)(formatByte.HiNibble() << 4);
for (var i = 0; i < AtrInfo.MaximumAtrCodes; i++)
{
if ((interfacePresence & 0x10) != 0)
atrInfo.ProtocolInterfaceA[i] = reader.ReadByte();
if ((interfacePresence & 0x20) != 0)
atrInfo.ProtocolInterfaceB[i] = reader.ReadByte();
if ((interfacePresence & 0x40) != 0)
atrInfo.ProtocolInterfaceC[i] = reader.ReadByte();
if ((interfacePresence & 0x80) != 0)
atrInfo.ProtocolInterfaceD[i] = reader.ReadByte();
else
break;
interfacePresence = atrInfo.ProtocolInterfaceD[i];
supportedProtocols |= (1 << interfacePresence.LowNibble());
}
var buffer = new byte[formatByte.LowNibble()];
reader.Read(buffer, 0, buffer.Length);
atrInfo.HistoricalBytes = buffer;
if ((supportedProtocols & ~1) != 0)
{
atrInfo.TckValid = ValidateTCK(atrBytes);
}
return atrInfo;
}
}
