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Editing: TimestampTag.php

<?php

declare(strict_types=1);

namespace CBOR\Tag;

use CBOR\CBORObject;
use CBOR\NegativeIntegerObject;
use CBOR\Normalizable;
use CBOR\OtherObject\DoublePrecisionFloatObject;
use CBOR\OtherObject\HalfPrecisionFloatObject;
use CBOR\OtherObject\SinglePrecisionFloatObject;
use CBOR\Tag;
use CBOR\UnsignedIntegerObject;
use DateTimeImmutable;
use DateTimeInterface;
use InvalidArgumentException;
use const STR_PAD_RIGHT;

final class TimestampTag extends Tag implements Normalizable
{
    public function __construct(int $additionalInformation, ?string $data, CBORObject $object)
    {
        if (! $object instanceof UnsignedIntegerObject && ! $object instanceof NegativeIntegerObject && ! $object instanceof HalfPrecisionFloatObject && ! $object instanceof SinglePrecisionFloatObject && ! $object instanceof DoublePrecisionFloatObject) {
            throw new InvalidArgumentException('This tag only accepts integer-based or float-based objects.');
        }
        parent::__construct($additionalInformation, $data, $object);
    }

public static function getTagId(): int
    {
        return self::TAG_EPOCH_DATETIME;
    }

public static function createFromLoadedData(int $additionalInformation, ?string $data, CBORObject $object): Tag
    {
        return new self($additionalInformation, $data, $object);
    }

public static function create(CBORObject $object): Tag
    {
        [$ai, $data] = self::determineComponents(self::TAG_EPOCH_DATETIME);

return new self($ai, $data, $object);
    }

public function normalize(): DateTimeInterface
    {
        $object = $this->object;

switch (true) {
            case $object instanceof UnsignedIntegerObject:
            case $object instanceof NegativeIntegerObject:
                $formatted = DateTimeImmutable::createFromFormat('U', $object->normalize());

break;
            case $object instanceof HalfPrecisionFloatObject:
            case $object instanceof SinglePrecisionFloatObject:
            case $object instanceof DoublePrecisionFloatObject:
                $value = (string) $object->normalize();
                $parts = explode('.', $value);
                if (isset($parts[1])) {
                    if (mb_strlen($parts[1], '8bit') > 6) {
                        $parts[1] = mb_substr($parts[1], 0, 6, '8bit');
                    } else {
                        $parts[1] = str_pad($parts[1], 6, '0', STR_PAD_RIGHT);
                    }
                }
                $formatted = DateTimeImmutable::createFromFormat('U.u', implode('.', $parts));

break;
            default:
                throw new InvalidArgumentException('Unable to normalize the object');
        }

if ($formatted === false) {
            throw new InvalidArgumentException('Invalid data. Cannot be converted into a datetime object');
        }

return $formatted;
    }
}

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