/**
* Decode a Message from raw network data
*
* @param string $data The data string to decode
* @return \LibDNS\Messages\Message
* @throws \UnexpectedValueException When the packet data is invalid
* @throws \InvalidArgumentException When a type subtype is unknown
*/
public function decode($data)
{
$packet = $this->packetFactory->create($data);
$decodingContext = $this->decodingContextFactory->create($packet);
$message = $this->messageFactory->create();
$this->decodeHeader($decodingContext, $message);
$questionRecords = $message->getQuestionRecords();
$expected = $decodingContext->getExpectedQuestionRecords();
for ($i = 0; $i < $expected; $i++) {
$questionRecords->add($this->decodeQuestionRecord($decodingContext));
}
$answerRecords = $message->getAnswerRecords();
$expected = $decodingContext->getExpectedAnswerRecords();
for ($i = 0; $i < $expected; $i++) {
$answerRecords->add($this->decodeResourceRecord($decodingContext));
}
$authorityRecords = $message->getAuthorityRecords();
$expected = $decodingContext->getExpectedAuthorityRecords();
for ($i = 0; $i < $expected; $i++) {
$authorityRecords->add($this->decodeResourceRecord($decodingContext));
}
$additionalRecords = $message->getAdditionalRecords();
$expected = $decodingContext->getExpectedAdditionalRecords();
for ($i = 0; $i < $expected; $i++) {
$additionalRecords->add($this->decodeResourceRecord($decodingContext));
}
if ($packet->getBytesRemaining() !== 0) {
throw new \UnexpectedValueException('Decode error: Unexpected data at end of packet');
}
return $message;
}
/**
* Encode a Message to raw network data
*
* @param \LibDNS\Messages\Message $message The Message to encode
* @param bool $compress Enable message compression
* @return string
*/
public function encode(Message $message, $compress = true)
{
$packet = $this->packetFactory->create();
$encodingContext = $this->encodingContextFactory->create($packet, $compress);
foreach ($message->getQuestionRecords() as $record) {
/** @var \LibDNS\Records\Question $record */
$this->encodeQuestionRecord($encodingContext, $record);
}
foreach ($message->getAnswerRecords() as $record) {
/** @var \LibDNS\Records\Resource $record */
$this->encodeResourceRecord($encodingContext, $record);
}
foreach ($message->getAuthorityRecords() as $record) {
/** @var \LibDNS\Records\Resource $record */
$this->encodeResourceRecord($encodingContext, $record);
}
foreach ($message->getAdditionalRecords() as $record) {
/** @var \LibDNS\Records\Resource $record */
$this->encodeResourceRecord($encodingContext, $record);
}
return $this->encodeHeader($encodingContext, $message) . $packet->read($packet->getLength());
}
