/// <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)
{
AtrInfo atrInfo = new AtrInfo();
byte initialChar = 0, formatByte = 0;
int supportedProtocols = 0;
using (DataReader reader = DataReader.FromBuffer(atrBytes.AsBuffer()))
{
initialChar = reader.ReadByte();
if (initialChar != (byte)AtrHeader.InitialHeader)
{
return(null);
}
formatByte = reader.ReadByte();
var interfacePresence = (byte)(formatByte.HiNibble() << 4);
for (int i = 0; i < AtrInfo.MAXIMUM_ATR_CODES; 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());
}
atrInfo.HistoricalBytes = reader.ReadBuffer(formatByte.LowNibble());
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)
{
AtrInfo atrInfo = new AtrInfo();
byte initialChar = 0, formatByte = 0;
int supportedProtocols = 0;
using (DataReader reader = DataReader.FromBuffer(atrBytes.AsBuffer()))
{
initialChar = reader.ReadByte();
if (initialChar != (byte)AtrHeader.InitialHeader)
{
return null;
}
formatByte = reader.ReadByte();
var interfacePresence = (byte)(formatByte.HiNibble() << 4);
for (int i = 0; i < AtrInfo.MAXIMUM_ATR_CODES; 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());
}
atrInfo.HistoricalBytes = reader.ReadBuffer(formatByte.LowNibble());
if ((supportedProtocols & ~1) != 0)
{
atrInfo.TckValid = ValidateTCK(atrBytes);
}
return atrInfo;
}
}
