/**
* Updates the length fields in both the header and the var entry, as well as the checksum
*/
private function refreshMetadataFields()
{
// todo : recompute correctly for multiple var entries
$this->varEntry['data_length2'] = $this->varEntry['data_length'] = count($this->varEntry['data']);
$this->header['entries_len'] = $this->varEntry['data_length'] + ($this->calcModel->getFlags() >= TIFeatureFlags::hasFlash) ? self::varEntryNewLength : self::varEntryOldLength;
$this->computedChecksum = $this->computeChecksumFromInstanceData();
}
private function makeVarEntryFromFile()
{
$calcFlags = $this->calcModel->getFlags();
$dataSectionOffset = 8 + 3 + 42 + 2;
// after header
fseek($this->file, $dataSectionOffset);
$this->varEntry = [];
$this->varEntry['constBytes'] = $this->get_raw_bytes(2);
$this->varEntry['data_length'] = $this->get_raw_bytes(1)[0] + ($this->get_raw_bytes(1)[0] << 8);
$this->varEntry['typeID'] = $this->get_raw_bytes(1)[0];
$this->varEntry['varname'] = $this->get_string_bytes(8);
$this->varEntry['version'] = $calcFlags >= TIFeatureFlags::hasFlash ? $this->get_raw_bytes(1)[0] : null;
$this->varEntry['archivedFlag'] = $calcFlags >= TIFeatureFlags::hasFlash ? $this->get_raw_bytes(1)[0] : null;
$this->varEntry['data_length2'] = $this->get_raw_bytes(1)[0] + ($this->get_raw_bytes(1)[0] << 8);
$this->varEntry['data'] = $this->get_raw_bytes($this->varEntry['data_length']);
}
