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<?php
namespace PhpZip\Extra;
use PhpZip\Exception\ZipException;
use PhpZip\Extra\Fields\ApkAlignmentExtraField;
use PhpZip\Extra\Fields\DefaultExtraField;
use PhpZip\Extra\Fields\JarMarkerExtraField;
use PhpZip\Extra\Fields\NtfsExtraField;
use PhpZip\Extra\Fields\WinZipAesEntryExtraField;
use PhpZip\Extra\Fields\Zip64ExtraField;
use PhpZip\Model\ZipEntry;
use PhpZip\Util\StringUtil;
/**
* Extra Fields Factory
*
* @author Ne-Lexa alexey@nelexa.ru
* @license MIT
*/
class ExtraFieldsFactory
{
/**
* @var array|null
*/
protected static $registry;
private function __construct()
{
}
/**
* @param string $extra
* @param ZipEntry|null $entry
* @return ExtraFieldsCollection
* @throws ZipException
*/
public static function createExtraFieldCollections($extra, ZipEntry $entry = null)
{
$extraFieldsCollection = new ExtraFieldsCollection();
if (null !== $extra) {
$extraLength = strlen($extra);
if ($extraLength > 0xffff) {
throw new ZipException("Extra Fields too large: " . $extraLength);
}
$pos = 0;
$endPos = $extraLength;
while ($endPos - $pos >= 4) {
$unpack = unpack('vheaderId/vdataSize', substr($extra, $pos, 4));
$pos += 4;
$headerId = (int)$unpack['headerId'];
$dataSize = (int)$unpack['dataSize'];
$extraField = ExtraFieldsFactory::create($headerId);
if ($extraField instanceof Zip64ExtraField && $entry !== null) {
$extraField->setEntry($entry);
}
$extraField->deserialize(substr($extra, $pos, $dataSize));
$pos += $dataSize;
$extraFieldsCollection[$headerId] = $extraField;
}
}
return $extraFieldsCollection;
}
public static function createSerializedData(ExtraFieldsCollection $extraFieldsCollection)
{
$extraData = '';
foreach ($extraFieldsCollection as $extraField) {
$data = $extraField->serialize();
$extraData .= pack('vv', $extraField::getHeaderId(), strlen($data));
$extraData .= $data;
}
$size = strlen($extraData);
if (0x0000 > $size || $size > 0xffff) {
throw new ZipException('Size extra out of range: ' . $size . '. Extra data: ' . $extraData);
}
return $extraData;
}
/**
* A static factory method which creates a new Extra Field based on the
* given Header ID.
* The returned Extra Field still requires proper initialization, for
* example by calling ExtraField::readFrom.
*
* @param int $headerId An unsigned short integer (two bytes) which indicates
* the type of the returned Extra Field.
* @return ExtraField A new Extra Field or null if not support header id.
* @throws ZipException If headerId is out of range.
*/
public static function create($headerId)
{
if (0x0000 > $headerId || $headerId > 0xffff) {
throw new ZipException('headerId out of range');
}
/**
* @var ExtraField $extraField
*/
if (isset(self::getRegistry()[$headerId])) {
$extraClassName = self::getRegistry()[$headerId];
$extraField = new $extraClassName;
if ($extraField::getHeaderId() !== $headerId) {
throw new ZipException('Runtime error support headerId ' . $headerId);
}
} else {
$extraField = new DefaultExtraField($headerId);
}
return $extraField;
}
/**
* Registered extra field classes.
*
* @return array
*/
protected static function getRegistry()
{
if (null === self::$registry) {
self::$registry[WinZipAesEntryExtraField::getHeaderId()] = WinZipAesEntryExtraField::class;
self::$registry[NtfsExtraField::getHeaderId()] = NtfsExtraField::class;
self::$registry[Zip64ExtraField::getHeaderId()] = Zip64ExtraField::class;
self::$registry[ApkAlignmentExtraField::getHeaderId()] = ApkAlignmentExtraField::class;
self::$registry[JarMarkerExtraField::getHeaderId()] = JarMarkerExtraField::class;
}
return self::$registry;
}
/**
* @return WinZipAesEntryExtraField
*/
public static function createWinZipAesEntryExtra()
{
return new WinZipAesEntryExtraField();
}
/**
* @return NtfsExtraField
*/
public static function createNtfsExtra()
{
return new NtfsExtraField();
}
/**
* @param ZipEntry $entry
* @return Zip64ExtraField
*/
public static function createZip64Extra(ZipEntry $entry)
{
return new Zip64ExtraField($entry);
}
/**
* @param ZipEntry $entry
* @param int $padding
* @return ApkAlignmentExtraField
*/
public static function createApkAlignExtra(ZipEntry $entry, $padding)
{
$padding = (int)$padding;
$multiple = 4;
if (StringUtil::endsWith($entry->getName(), '.so')) {
$multiple = ApkAlignmentExtraField::ANDROID_COMMON_PAGE_ALIGNMENT_BYTES;
}
$extraField = new ApkAlignmentExtraField();
$extraField->setMultiple($multiple);
$extraField->setPadding($padding);
return $extraField;
}
}
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