protected function readHeader(MemStream $s)
{
// check header
$s->serial_buffer($hskp, 4);
if ($hskp !== self::HEADER) {
throw new \RuntimeException('Wrong packed sheets header, expected "' . self::HEADER . '"');
}
$s->serial_uint32($header_version);
if ($header_version != self::HEADER_VERSION) {
throw new \RuntimeException('Wrong packed sheets version, expected "' . self::HEADER_VERSION . '", got "' . $header_version . '"');
}
$s->serial_byte($this->compat);
$s->serial_uint32($dependBlockSize);
if ($this->skipDependBlock) {
// skip dependency block
$pos = $s->getPos();
$s->seek($pos + $dependBlockSize);
} else {
// read dictionary
$s->serial_uint32($nb);
$s->serial_int_string($this->dictionnary, $nb);
// read dependency data
$this->dependencies = array();
$s->serial_uint32($depSize);
for ($i = 0; $i < $depSize; $i++) {
$s->serial_uint32($sheetId);
$s->serial_uint32($nb);
$s->serial_uint32($this->dependencies[$sheetId], $nb);
}
}
}