96 lines
3.1 KiB
PHP
96 lines
3.1 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\CBORObject;
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use CBOR\ListObject;
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use CBOR\SignedIntegerObject;
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use CBOR\TagObject as Base;
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use CBOR\UnsignedIntegerObject;
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use InvalidArgumentException;
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use RuntimeException;
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final class DecimalFractionTag extends Base
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{
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public static function getTagId(): int
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{
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return 4;
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}
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public static function createFromLoadedData(int $additionalInformation, ?string $data, CBORObject $object): Base
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{
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return new self($object);
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}
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public function __construct(CBORObject $object)
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{
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if (!\extension_loaded('bcmath')) {
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throw new RuntimeException('The extension "bcmath" is required to use this tag');
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}
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if (!$object instanceof ListObject || 2 !== \count($object)) {
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throw new InvalidArgumentException('This tag only accepts a ListObject object that contains an exponent and a mantissa.');
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}
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$e = $object->get(0);
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if (!$e instanceof UnsignedIntegerObject && !$e instanceof SignedIntegerObject) {
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throw new InvalidArgumentException('The exponent must be a Signed Integer or an Unsigned Integer object.');
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}
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$m = $object->get(1);
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if (!$m instanceof UnsignedIntegerObject && !$m instanceof SignedIntegerObject && !$m instanceof NegativeBigIntegerTag && !$m instanceof PositiveBigIntegerTag) {
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throw new InvalidArgumentException('The mantissa must be a Positive or Negative Signed Integer or an Unsigned Integer object.');
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}
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parent::__construct(4, null, $object);
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}
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public static function createFromExponentAndMantissa(CBORObject $e, CBORObject $m): Base
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{
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$object = new ListObject();
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$object->add($e);
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$object->add($m);
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return new self($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 (!$this->object instanceof ListObject || 2 !== \count($this->object)) {
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return $this->object->getNormalizedData($ignoreTags);
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}
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$e = $this->object->get(0);
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$m = $this->object->get(1);
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if (!$e instanceof UnsignedIntegerObject && !$e instanceof SignedIntegerObject) {
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return $this->object->getNormalizedData($ignoreTags);
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}
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if (!$m instanceof UnsignedIntegerObject && !$m instanceof SignedIntegerObject && !$m instanceof NegativeBigIntegerTag && !$m instanceof PositiveBigIntegerTag) {
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return $this->object->getNormalizedData($ignoreTags);
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}
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return rtrim(
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bcmul(
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$m->getNormalizedData($ignoreTags),
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bcpow(
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'10',
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$e->getNormalizedData($ignoreTags),
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100),
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100),
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'0'
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);
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}
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}
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