private SonyNdefRecord ParsePayload(byte[] payload)
{
var ret = new SonyNdefRecord();
StringBuilder sb = new StringBuilder();
int SSIDStartPointer = 0;
int SSIDLength = 0;
int PasswordStartPointer = 0;
int PasswordLength = 0;
// find SSID
for (int i = 0; i < payload.Length; i++)
{
int val = (int)payload[i];
Debug.WriteLine((char)val);
if (val > 0x19 && i > 1 && (int)payload[i - 2] == 0)
{
// ASCII
SSIDStartPointer = i;
SSIDLength = (int)payload[i - 1];
break;
}
}
Debug.WriteLine("ssid starts from: " + SSIDStartPointer);
Debug.WriteLine("ssid length: " + SSIDLength);
// get ssid
for (int i = 0; i < SSIDLength; i++)
{
sb.Append((char)payload[SSIDStartPointer + i]);
}
ret.SSID = sb.ToString();
Debug.WriteLine("ssid: " + ret.SSID);
sb.Clear();
// find password
for (int i = SSIDStartPointer + SSIDLength; i < payload.Length; i++)
{
int val = (int)payload[i];
if (val > 0x19 && i > 1 && (int)payload[i - 2] == 0)
{
// if ASCII found
PasswordStartPointer = i;
PasswordLength = (int)payload[i - 1];
break;
}
}
Debug.WriteLine("password starts from: " + PasswordStartPointer);
Debug.WriteLine("password length: " + PasswordLength);
// get password
for (int i = 0; i < PasswordLength; i++)
{
sb.Append((char)payload[PasswordStartPointer + i]);
}
ret.Password = sb.ToString();
return ret;
}
private void _parse()
{
int recordPointer = 0;
var record = new SonyNdefRecord();
record.ndefHeader = raw[recordPointer];
recordPointer++;
record.typeLength = raw[recordPointer];
// to check whether short record or not
if ((0x10 & record.ndefHeader) == 0x10)
{
// short length
recordPointer += 1;
record.payloadLength = raw[recordPointer];
}
else
{
// not sony nfc format
recordPointer += 4;
}
// to check id length (0 or 1)
if ((0x08 & record.ndefHeader) == 0x08)
{
record.idLength = 1;
recordPointer++;
record.idLength = (int)raw[recordPointer];
}
else
{
record.idLength = 0;
}
recordPointer++;
// get type
int typeEndPointer = recordPointer + record.typeLength;
StringBuilder sb = new StringBuilder();
for (; recordPointer < typeEndPointer; recordPointer++)
{
sb.Append((char)raw[recordPointer]);
}
record.type = sb.ToString();
sb.Clear();
recordPointer++;
// get id (if exist)
if (record.idLength > 0)
{
int idEndPointer = recordPointer + record.idLength;
for (; recordPointer < idEndPointer; recordPointer++)
{
sb.Append((char)raw[recordPointer]);
}
record.id = sb.ToString();
sb.Clear();
recordPointer++;
}
// get payload
int payloadEndPointer = recordPointer + record.payloadLength;
Byte[] payload = new Byte[record.payloadLength];
Array.Copy(raw, recordPointer, payload, 0, record.payloadLength);
var parsedPayload = this.ParsePayload(payload);
record.SSID = parsedPayload.SSID;
record.Password = parsedPayload.Password;
for (; recordPointer < payloadEndPointer; recordPointer++)
{
char ch = (char)raw[recordPointer];
if ((int)ch > 0x19)
{
// Debug.WriteLine(ch);
sb.Append(ch);
}
else
{
// Debug.WriteLine((int)ch);
}
}
record.payload = sb.ToString();
sb.Clear();
records.Add(record);
record.dump();
}