/**
* Sends one block of a file to the client.
*
* @param Client $client Client
* @param integer $piece_index Index of the piece containing the block.
* @param integer $block_begin Beginning of the block relative
* to the piece in bytes.
* @param integer $length Length of the block in bytes.
*
* @return void
*/
protected function sendBlock(Client $client, $piece_index, $block_begin, $length)
{
$message = pack('CNN', 7, $piece_index, $block_begin) . $client->getTorrent()->readBlock($piece_index, $block_begin, $length);
$client->socketWrite(pack('N', strlen($message)) . $message);
// Saving statistics.
$client->addStatBytes($length, Client::STAT_DATA_SENT);
}
