/**
* will unpack binary string and return new instance of self with properties set
*
* @param string $data
* @return DataHeader
* @throws TransformerException
*/
static function unpack($data)
{
$info = unpack('Slength', substr($data, 0, 2));
$info += unpack('Lsignature/A4hash/Spid/Cserialized/Ccompressed/Ctype/A*name', substr($data, 2, $info['length'] - 2));
if (self::SIGNATURE !== $info['signature']) {
throw TransformerException::signatureMismatch($info['signature'], self::SIGNATURE);
}
return (new self())->setSize($info['length'])->setHash($info['hash'])->setPid($info['pid'])->setType($info['type'])->setCompressed($info['serialized'])->setSerialized($info['compressed'])->setName($info['name']);
}
/**
* will unpack binary string and return new instance of self with properties set
*
* @param string $data
* @return DataContainer
* @throws TransformerException
*/
static function unpack($data)
{
$header = DataHeader::unpack($data);
$data = substr($data, $header->getSize());
$hash = hash('crc32b', $data, true);
if ($hash !== $header->getHash()) {
throw TransformerException::crcMismatch($hash, $header->getHash());
}
if ($header->isCompressed()) {
$data = gzuncompress($data);
}
if ($header->isSerialized()) {
$data = unserialize($data);
}
switch ($header->getType()) {
case $header::T_BOOLEAN:
$data = (bool) $data;
break;
case $header::T_INTEGER:
$data = (int) $data;
break;
case $header::T_DOUBLE:
$data = (double) $data;
break;
case $header::T_STRING:
$data = (string) $data;
break;
}
return new DataContainer($data, $header);
}
