/**
* Creates an instance from a resource.
* @param string $filename File name.
* @param resource $fileHandler File handler.
*
* @throws FileCorruptedException
*
* @return FileHeader
*/
public static function createFromResource($filename, $fileHandler)
{
$header = new FileHeader();
$data = unpack("nmagicNumber/C1compressionMethod/C1flags/LmodificationTime/C1extraFlags/C1os", fread($fileHandler, 10));
// check magic number and compression method
if (self::MAGIC_NUMBER !== $data['magicNumber'] || self::COMPRESSION_METHOD_DEFLATE !== $data['compressionMethod']) {
throw new FileCorruptedException($filename);
}
$header->setCompressionMethod($data['compressionMethod'])->setFlags($data['flags'])->setExtraFlags($data['extraFlags'])->setModificationTimeFromUnixEpoch($data['modificationTime'])->setOperatingSystem($data['os']);
// if FLG.FEXTRA set
if (($header->getFlags() & self::FLAGS_EXTRA) === self::FLAGS_EXTRA) {
$extraFieldData = unpack("C2subfield/vlength", fread($fileHandler, 10));
$header->setExtraSubfields($extraFieldData['subfield1'], $extraFieldData['subfield2'])->setExtraData(fread($fileHandler, $extraFieldData['length']));
}
// if FLG.FNAME set
if (($header->getFlags() & self::FLAGS_NAME) === self::FLAGS_NAME) {
$header->setOriginalFilename(self::readString($fileHandler));
}
// if FLG.FCOMMENT set
if (($header->getFlags() & self::FLAGS_COMMENT) === self::FLAGS_COMMENT) {
$header->setComment(self::readString($fileHandler));
}
// if FLG.FHCRC set
if (($header->getFlags() & self::FLAGS_HCRC) === self::FLAGS_HCRC) {
$crcData = unpack('vcrc', fread($fileHandler, 2));
$header->setCrc16($crcData['crc']);
}
return $header;
}