public static byte[] toBytes(NdefRecord[] records)
{
MemoryStream encoded = new MemoryStream();
for (int i = 0; i < records.Length; i++)
{
bool mb = (i == 0);
bool me = (i == (records.Length - 1));
bool cf = false; // TODO
bool sr = (records[i].payload.Length < 0xFF);
bool il = (records[i].id.Length > 0);
byte tnf_byte = encodeTnf(mb, me, cf, sr, il, records[i].tnf);
encoded.WriteByte(tnf_byte);
int type_length = records[i].type.Length;
encoded.WriteByte((byte)type_length);
int payload_length = records[i].payload.Length;
if (sr)
{
encoded.WriteByte((byte)payload_length);
}
else
{
// 4 bytes
encoded.WriteByte((byte)(payload_length >> 24));
encoded.WriteByte((byte)(payload_length >> 16));
encoded.WriteByte((byte)(payload_length >> 8));
encoded.WriteByte((byte)(payload_length & 0xFF));
}
int id_length = 0;
if (il)
{
id_length = records[i].id.Length;
encoded.WriteByte((byte)id_length);
}
encoded.Write(records[i].type, 0, type_length);
if (il)
{
encoded.Write(records[i].id, 0, id_length);
}
encoded.Write(records[i].payload, 0, payload_length);
}
return encoded.ToArray();
}
public static List<NdefRecord> parse(byte[] bytes)
{
List<NdefRecord> records = new List<NdefRecord>();
int index = 0;
while (index <= bytes.Length)
{
byte tnf_byte = bytes[index];
bool mb = (tnf_byte & 0x80) != 0;
bool me = (tnf_byte & 0x40) != 0;
bool cf = (tnf_byte & 0x20) != 0;
bool sr = (tnf_byte & 0x10) != 0;
bool il = (tnf_byte & 0x8) != 0;
int tnf = tnf_byte & 0x7;
if (cf)
{
// TODO implement me
throw new IOException("Chunked records are not supported.");
}
index++;
int typeLength = bytes[index];
int idLength = 0;
int payloadLength = 0;
if (sr)
{
index++;
payloadLength = bytes[index];
}
else
{
payloadLength = ((0xFF & bytes[++index]) << 24) |
((0xFF & bytes[++index]) << 26) |
((0xFF & bytes[++index]) << 8) |
(0xFF & bytes[++index]);
}
if (il)
{
index++;
idLength = bytes[index];
}
index++;
IBuffer type = bytes.AsBuffer(index, typeLength);
index += typeLength;
IBuffer id = bytes.AsBuffer(index, idLength);
index += idLength;
IBuffer payload = bytes.AsBuffer(index, payloadLength);
index += payloadLength;
NdefRecord record = new NdefRecord();
record.tnf = (byte)tnf;
record.type = typeLength > 0 ? type.ToArray() : new byte[0];
record.id = idLength > 0 ? id.ToArray() : new byte[0];
record.payload = payloadLength > 0 ? payload.ToArray() : new byte[0];
records.Add(record);
if (me) break; // last message
}
return records;
}
public static List <NdefRecord> parse(byte[] bytes)
{
List <NdefRecord> records = new List <NdefRecord>();
int index = 0;
while (index <= bytes.Length)
{
byte tnf_byte = bytes[index];
bool mb = (tnf_byte & 0x80) != 0;
bool me = (tnf_byte & 0x40) != 0;
bool cf = (tnf_byte & 0x20) != 0;
bool sr = (tnf_byte & 0x10) != 0;
bool il = (tnf_byte & 0x8) != 0;
int tnf = tnf_byte & 0x7;
if (cf)
{
// TODO implement me
throw new IOException("Chunked records are not supported.");
}
index++;
int typeLength = bytes[index];
int idLength = 0;
int payloadLength = 0;
if (sr)
{
index++;
payloadLength = bytes[index];
}
else
{
payloadLength = ((0xFF & bytes[++index]) << 24) |
((0xFF & bytes[++index]) << 26) |
((0xFF & bytes[++index]) << 8) |
(0xFF & bytes[++index]);
}
if (il)
{
index++;
idLength = bytes[index];
}
index++;
IBuffer type = bytes.AsBuffer(index, typeLength);
index += typeLength;
IBuffer id = bytes.AsBuffer(index, idLength);
index += idLength;
IBuffer payload = bytes.AsBuffer(index, payloadLength);
index += payloadLength;
NdefRecord record = new NdefRecord();
record.tnf = (byte)tnf;
record.type = typeLength > 0 ? type.ToArray() : new byte[0];
record.id = idLength > 0 ? id.ToArray() : new byte[0];
record.payload = payloadLength > 0 ? payload.ToArray() : new byte[0];
records.Add(record);
if (me)
{
break; // last message
}
}
return(records);
}
