private void HandleMifareUL(ICardReader reader)
{
var mifare = new PcscSdk.MifareUltralight.AccessHandler(reader);
StatusMessage?.Invoke("Handling as Mifare Ultralight");
byte[] uid = mifare.GetUid();
StatusMessage?.Invoke("UID: " + BitConverter.ToString(uid));
Array.Resize(ref uid, uid.Length + 1);
uid[uid.Length - 1] = 0xAA;
NewTagUid?.Invoke(uid);
byte[] infoData = mifare.Read(0);
StatusMessage?.Invoke("CC: " + BitConverter.ToString(infoData.Skip(12).ToArray()));
try
{
byte[] versionData = mifare.GetVersion();
StatusMessage?.Invoke("Mifare Version: " + BitConverter.ToString(versionData));
int capacity = versionData[6] >> 1;
int capacityMax = capacity;
if ((versionData[6] & 1) == 1)
{
capacityMax += 1;
}
capacity = (int)Math.Pow(2, capacity);
capacityMax = (int)Math.Pow(2, capacityMax);
StatusMessage?.Invoke("Capacity is between " + capacity + " and " + capacityMax + " bytes");
}
catch (ApduFailedException e)
{
StatusMessage?.Invoke("Failed getting Mifare Version: " + e.Message);
}
byte identMagic = infoData[12];
byte identVersion = infoData[13];
int identCapacity = infoData[14] * 8;
int major = identVersion >> 4;
int minor = identVersion & 0x0F;
if (identMagic != 0xE1 || identVersion < 0x10)
{
throw new NfcHandlerException("Tag format is unsupported");
}
StatusMessage?.Invoke("Found Type 2 Tag version " + major + "." + minor + " with " + identCapacity + " bytes capacity.");
if (ndefDataToWrite != null)
{
WriteNdefToMifareUL(mifare, ndefDataToWrite);
ndefDataToWrite = null;
}
else
{
byte[] data = DumpMifareUL(mifare);
ParseTLVData(data);
}
}
private byte[] DumpMifareUL(PcscSdk.MifareUltralight.AccessHandler mifare)
{
byte[] infoData = mifare.Read(3);
int bytes_left = infoData[2] * 8;
byte[] res = new byte[bytes_left];
for (byte pos = 4; bytes_left > 0; pos += 4, bytes_left -= 16)
{
byte[] data = mifare.Read(pos);
if (bytes_left < 16)
{
data = data.Take(bytes_left).ToArray();
}
data.CopyTo(res, (pos - 4) * 4);
}
return(res);
}
private void WriteNdefToMifareUL(PcscSdk.MifareUltralight.AccessHandler mifare, byte[] ndefData)
{
byte[] infoData = mifare.Read(3);
int capacity = infoData[2] * 8;
byte[] wrappedData = GenerateTLVData(ndefData);
if (wrappedData.Length > capacity)
{
throw new NfcHandlerException("Data size of " + wrappedData.Length + " bytes exceeds capacity of " + capacity + " bytes!");
}
int data_length = wrappedData.Length;
Array.Resize(ref wrappedData, (data_length / 4) * 4 + 4);
for (byte pos = 4; (pos - 4) * 4 < wrappedData.Length; pos++)
{
mifare.Write(pos, wrappedData.Skip((pos - 4) * 4).Take(4).ToArray());
}
StatusMessage?.Invoke("Written " + data_length + " bytes of data. Ndef message length is " + ndefData.Length + " bytes.");
}