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