/**
* @param SecretTextInterface $secretText
*/
public function __construct(SecretTextInterface $secretText)
{
$this->data = $secretText->getBinaryData();
$this->itemSize = $secretText->getBinaryItemSize();
$this->maxIndex = strlen($this->data) - 1;
}
/**
* Decode stegoText
*
* @param ImageInterface $stegoText
* @param SecretTextInterface $secretText
* @return string
*/
public function decode(ImageInterface $stegoText, SecretTextInterface $secretText)
{
$secretText->setBinaryItemSize($this->channelsSize);
$iterator = $this->getImageIterator($stegoText);
$result = '';
do {
// get lasts bits value of pixel accordingly confugurated channel
$result .= $this->decodeItem($iterator, $stegoText);
// move to next pixel
$iterator->next();
} while ($secretText->getEndMarkPos($result) === false);
return $secretText->getFromBinaryData($result);
}