/**
* read first block to skip the header
*/
protected function skipHeader()
{
parent::stream_read($this->headerSize);
}
/**
* read block to file
*/
protected function readCache()
{
// cache should always be empty string when this function is called
// don't try to fill the cache when trying to write at the end of the unencrypted file when it coincides with new block
if ($this->cache === '' && !($this->position === $this->unencryptedSize && $this->position % $this->unencryptedBlockSize === 0)) {
// Get the data from the file handle
$data = parent::stream_read($this->util->getBlockSize());
$this->cache = $this->encryptionModule->decrypt($data);
}
}
