/// <summary>
/// Write the answer data into the given byte array and return the number of bytes written
/// </summary>
/// <param name="array">Array.</param>
/// <param name="offset">Offset.</param>
public int WriteAnswer(byte[] array, int offset)
{
int startingOffset = offset;
// 2 bytes - NAME POINTER
// 16 bit pointer, with two first bits 11 indiciating we are sending a pointer
// If the answer is linked to an answer with a pointer, return a pointer, otherwise return a label
if (this.Question != null && this.Question.DataPointer > 0)
{
var pointerBytes = BitConverter.GetBytes(this.Question.DataPointer);
ByteArray.SwapFields(pointerBytes, 0, 1);
// First two bits indicate a pointer
pointerBytes[0] += (1 << 7);
pointerBytes[0] += (1 << 6);
array[offset++] = pointerBytes[0];
array[offset++] = pointerBytes[1];
}
// If not linked to an answer, check if we can output the hostname label
else if (this.Hostname != null && this.Hostname.Length > 0)
{
offset += DnsUtil.WriteHostnameLabel(array, offset, this.Hostname);
}
// Finally, if we can't find another hostname, we output an empty pointer
else
{
array[offset++] = 0;
array[offset++] = 0;
}
// Write the record and finish
offset += this.Record.WriteRecord(array, offset);
return(offset - startingOffset);
}
/// <summary>
/// Write the response data
/// </summary>
/// <param name="array"></param>
/// <param name="offset"></param>
/// <returns></returns>
protected override int WriteResponseData(byte[] array, int offset)
{
int bytesWritten = DnsEncoder.WriteUint16(array, this.Priority, offset);
bytesWritten += DnsUtil.WriteHostnameLabel(array, offset + bytesWritten, this.Value);
return(bytesWritten);
}
/// <summary>
/// Write the response data
/// </summary>
/// <param name="array"></param>
/// <param name="offset"></param>
/// <returns></returns>
protected override int WriteResponseData(byte[] array, int offset)
{
int bytesWritten = DnsUtil.WriteHostnameLabel(array, offset, this.MasterHostname);
bytesWritten += DnsUtil.WriteHostnameLabel(array, offset + bytesWritten, this.ResponsibleMailboxHostname);
bytesWritten += DnsEncoder.WriteUint32(array, this.SerialNumber, offset + bytesWritten);
bytesWritten += DnsEncoder.WriteInt32(array, this.RefreshInterval, offset + bytesWritten);
bytesWritten += DnsEncoder.WriteInt32(array, this.RetryInterval, offset + bytesWritten);
bytesWritten += DnsEncoder.WriteInt32(array, this.ExpirationLimit, offset + bytesWritten);
bytesWritten += DnsEncoder.WriteInt32(array, this.MinimumTTL, offset + bytesWritten);
return(bytesWritten);
}
/// <summary>
/// Write the record response data
/// </summary>
/// <param name="array"></param>
/// <param name="offset"></param>
/// <returns></returns>
protected override int WriteResponseData(byte[] array, int offset)
{
var hostnameLength = DnsUtil.WriteHostnameLabel(array, offset, this.Hostname);
return(hostnameLength);
}
