protected override bool WriteContent(byte[] ndef_content)
{
Trace.WriteLine("Writing the NFC Forum type 2 Tag");
if (ndef_content == null)
{
return(false);
}
/* Get the new NDEF TLV to store into the Tag */
NfcTlv ndef_tlv = new NfcTlv(NDEF_MESSAGE_TLV, ndef_content);
/* Remove the Terminator TLV (if some) */
while ((_tlvs.Count > 0) && (_tlvs[_tlvs.Count - 1].T == TERMINATOR_TLV))
{
_tlvs.RemoveAt(_tlvs.Count - 1);
}
/* Where shall I put the NDEF TLV in the Tag ? */
if (_tlvs.Count == 0)
{
_tlvs.Add(ndef_tlv);
}
else
{
for (int i = 0; i < _tlvs.Count; i++)
{
if (_tlvs[i].T == NDEF_MESSAGE_TLV)
{
/* Replace this one */
_tlvs[i] = ndef_tlv;
ndef_tlv = null;
break;
}
}
if (ndef_tlv != null)
{
/* No NDEF in the Tag beforehand? Let's add it the the end */
_tlvs.Add(ndef_tlv);
}
}
CardBuffer actual_content = new CardBuffer();
for (int i = 0; i < _tlvs.Count; i++)
{
actual_content.Append(_tlvs[i].Serialize());
}
if (actual_content.Length > Capacity())
{
Trace.WriteLine("The size of the content (with its TLVs) is bigger than the tag's capacity");
return(false);
}
if ((actual_content.Length + 2) < Capacity())
{
/* Add a Terminator at the end */
Trace.WriteLine("We add a TERMINATOR TLV at the end of the Tag");
actual_content.Append((new NfcTlv(TERMINATOR_TLV, null)).Serialize());
}
/* And now write */
ushort page = 4;
for (long i = 0; i < actual_content.Length; i += 4)
{
byte[] buffer = new byte[4];
for (long j = 0; j < 4; j++)
{
if ((i + j) < actual_content.Length)
{
buffer[j] = actual_content.GetByte(i + j);
}
}
if (!WriteBinary(_channel, page, buffer))
{
return(false);
}
page++;
}
return(true);
}
private bool ParseUserData(byte[] user_data, ref byte[] ndef_data)
{
byte[] buffer = user_data;
byte[] remaining_buffer = null;
_tlvs.Clear();
while (buffer != null)
{
NfcTlv tlv = NfcTlv.Unserialize(buffer, ref remaining_buffer);
buffer = remaining_buffer;
if (tlv == null)
{
Trace.WriteLine("An invalid content has been found (not a T,L,V)");
break;
}
switch (tlv.T)
{
case NDEF_MESSAGE_TLV:
Trace.WriteLine("Found a NDEF TLV");
if (ndef_data != null)
{
Trace.WriteLine("The Tag has already a NDEF, ignoring this one");
}
else
{
ndef_data = tlv.V;
}
break;
case LOCK_CONTROL_TLV:
Trace.WriteLine("Found a LOCK CONTROL TLV");
break;
case MEMORY_CONTROL_TLV:
Trace.WriteLine("Found a MEMORY CONTROL TLV");
break;
case PROPRIETARY_TLV:
Trace.WriteLine("Found a PROPRIETARY TLV");
break;
case TERMINATOR_TLV:
Trace.WriteLine("Found a TERMINATOR TLV");
/* After a terminator... we terminate */
buffer = null;
break;
case NULL_TLV:
/* Terminate here */
buffer = null;
break;
default:
Trace.WriteLine("Found an unsupported TLV (T=" + tlv.T + ")");
return(false);
}
if (tlv.T != NULL_TLV)
{
_tlvs.Add(tlv);
}
}
return(true);
}