57 lines
1.4 KiB
PHP
57 lines
1.4 KiB
PHP
<?php
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declare(strict_types=1);
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/*
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* The MIT License (MIT)
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*
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* Copyright (c) 2018 Spomky-Labs
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*
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* This software may be modified and distributed under the terms
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* of the MIT license. See the LICENSE file for details.
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*/
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namespace CBOR\Tag;
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use CBOR\ByteStringObject;
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use CBOR\CBORObject;
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use CBOR\TagObject as Base;
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use InvalidArgumentException;
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final class NegativeBigIntegerTag extends Base
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{
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public static function getTagId(): int
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{
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return 3;
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}
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public static function createFromLoadedData(int $additionalInformation, ?string $data, CBORObject $object): Base
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{
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return new self($additionalInformation, $data, $object);
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}
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public static function create(CBORObject $object): Base
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{
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if (!$object instanceof ByteStringObject) {
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throw new InvalidArgumentException('This tag only accepts a Byte String object.');
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}
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return new self(3, null, $object);
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}
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public function getNormalizedData(bool $ignoreTags = false)
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{
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if ($ignoreTags) {
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return $this->object->getNormalizedData($ignoreTags);
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}
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if (!$this->object instanceof ByteStringObject) {
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return $this->object->getNormalizedData($ignoreTags);
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}
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$integer = gmp_init(bin2hex($this->object->getValue()), 16);
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$minusOne = gmp_init('-1', 10);
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return gmp_strval(gmp_sub($minusOne, $integer), 10);
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}
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}
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