/**
* Sending initial bitfield to the clint
* letting it know that we have to entire file.
*
* The bitfield looks like:
* [11111111-11111111-11100000]
* Meaning that we have all the 19 pieces (padding bits must be 0).
*
* @param Client $client Client
*
* @return void
*/
protected function sendBitField(Client $client)
{
$n_pieces = ceil($client->getTorrent()->length / $client->getTorrent()->size_piece);
$message = pack('C', 5);
while ($n_pieces > 0) {
if ($n_pieces >= 8) {
$message .= pack('C', 255);
$n_pieces -= 8;
} else {
// Last byte of the bitfield, like 11100000.
$message .= pack('C', 256 - pow(2, 8 - $n_pieces));
$n_pieces = 0;
}
}
$client->socketWrite(pack('N', strlen($message)) . $message);
}
