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<?php
declare(strict_types=1);
namespace ZipStream\Zip64;
use ZipStream\PackField;
/**
* @internal
*/
abstract class ExtendedInformationExtraField
{
private const TAG = 0x0001;
public static function generate(
?int $originalSize = null,
?int $compressedSize = null,
?int $relativeHeaderOffset = null,
?int $diskStartNumber = null,
): string {
return PackField::pack(
new PackField(format: 'v', value: self::TAG),
new PackField(
format: 'v',
value: ($originalSize === null ? 0 : 8) +
($compressedSize === null ? 0 : 8) +
($relativeHeaderOffset === null ? 0 : 8) +
($diskStartNumber === null ? 0 : 4)
),
...($originalSize === null ? [] : [
new PackField(format: 'P', value: $originalSize),
]),
...($compressedSize === null ? [] : [
new PackField(format: 'P', value: $compressedSize),
]),
...($relativeHeaderOffset === null ? [] : [
new PackField(format: 'P', value: $relativeHeaderOffset),
]),
...($diskStartNumber === null ? [] : [
new PackField(format: 'V', value: $diskStartNumber),
]),
);
}
}
|
