/// <summary>
/// Create NDEF Message from a span of bytes
/// </summary>
/// <param name="message">the message in span of bytes</param>
public NdefMessage(ReadOnlySpan <byte> message)
{
int idxMessage = 0;
while (idxMessage < message.Length)
{
var ndefrec = new NdefRecord(message.Slice(idxMessage));
Records.Add(ndefrec);
idxMessage += ndefrec.Length;
}
}
/// <summary>
/// Check if it's a valid Text Record
/// </summary>
/// <param name="ndefRecord">The NDEF Record to check</param>
/// <returns>True if it's a valid Text Record</returns>
public static bool IsTextRecord(NdefRecord ndefRecord)
{
if ((ndefRecord.Header.TypeNameFormat != TypeNameFormat.NfcWellKnowType) || (ndefRecord.Header.PayloadTypeLength != 1))
{
return(false);
}
if (ndefRecord.Header.PayloadType?[0] != 0x54)
{
return(false);
}
return(true);
}
/// <summary>
/// Check if it's a valid NDEF Geo Record
/// </summary>
/// <param name="ndefRecord">A valid NDEF Record</param>
/// <returns></returns>
public static bool IsGeoRecord(NdefRecord ndefRecord)
{
if (!IsUriRecord(ndefRecord))
{
return(false);
}
var uri = new UriRecord(ndefRecord);
if (!uri.Uri.ToLower().StartsWith("geo:"))
{
return(false);
}
return(true);
}
/// <summary> /// Check if it's a valid Media Record /// </summary> /// <param name="ndefRecord">A valid NDEF Record</param> /// <returns></returns> public static bool IsMediaRecord(NdefRecord ndefRecord) => ndefRecord.Header.TypeNameFormat == TypeNameFormat.MediaType;
/// <summary>
/// Create a Media Record from a NDEF Record
/// </summary>
/// <param name="ndefRecord">A valid NDEF Record</param>
public MediaRecord(NdefRecord ndefRecord)
{
Header = ndefRecord.Header;
Payload = ndefRecord.Payload;
}
/// <summary>
/// Create a Text Record from a NDEF Record
/// </summary>
/// <param name="ndefRecord">A valid NDEF Record</param>
public TextRecord(NdefRecord ndefRecord)
{
Header = ndefRecord.Header;
Payload = ndefRecord.Payload;
ExtractAll();
}
/// <summary>
/// Create a Geo Record from a NDEF record
/// </summary>
/// <param name="ndefRecord">The NDEF record to create the Geo Record</param>
public GeoRecord(NdefRecord ndefRecord)
: base(ndefRecord)
{
ExtractAll();
}
