Viewing file:  SignedIntegerObject.php (4.85 KB) -rwxr-x---
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<?php
declare(strict_types=1);
/*
* The MIT License (MIT)
*
* Copyright (c) 2018-2020 Spomky-Labs
*
* This software may be modified and distributed under the terms
* of the MIT license. See the LICENSE file for details.
*/
namespace CBOR;
use Brick\Math\BigInteger;
use GMP;
use InvalidArgumentException;
final class SignedIntegerObject extends AbstractCBORObject
{
private const MAJOR_TYPE = 0b001;
/**
* @var string|null
*/
private $data;
public function __construct(int $additionalInformation, ?string $data)
{
parent::__construct(self::MAJOR_TYPE, $additionalInformation);
$this->data = $data;
}
public function __toString(): string
{
$result = parent::__toString();
if (null !== $this->data) {
$result .= $this->data;
}
return $result;
}
public static function createObjectForValue(int $additionalInformation, ?string $data): self
{
return new self($additionalInformation, $data);
}
public static function create(int $value): self
{
return self::createFromString((string) $value);
}
public static function createFromString(string $value): self
{
$integer = BigInteger::of($value);
return self::createBigInteger($integer);
}
/**
* @deprecated Deprecated since v1.1 and will be removed in v2.0. Please use "create" or "createFromString" instead
*/
public static function createFromGmpValue(GMP $value): self
{
if (gmp_cmp($value, gmp_init(0)) >= 0) {
throw new InvalidArgumentException('The value must be a negative integer.');
}
$minusOne = gmp_init(-1);
$computed_value = gmp_sub($minusOne, $value);
switch (true) {
case gmp_intval($computed_value) < 24:
$ai = gmp_intval($computed_value);
$data = null;
break;
case gmp_cmp($computed_value, gmp_init('FF', 16)) < 0:
$ai = 24;
$data = self::hex2bin(str_pad(gmp_strval($computed_value, 16), 2, '0', STR_PAD_LEFT));
break;
case gmp_cmp($computed_value, gmp_init('FFFF', 16)) < 0:
$ai = 25;
$data = self::hex2bin(str_pad(gmp_strval($computed_value, 16), 4, '0', STR_PAD_LEFT));
break;
case gmp_cmp($computed_value, gmp_init('FFFFFFFF', 16)) < 0:
$ai = 26;
$data = self::hex2bin(str_pad(gmp_strval($computed_value, 16), 8, '0', STR_PAD_LEFT));
break;
default:
throw new InvalidArgumentException('Out of range. Please use NegativeBigIntegerTag tag with ByteStringObject object instead.');
}
return new self($ai, $data);
}
public function getValue(): string
{
return $this->getNormalizedData();
}
public function getNormalizedData(bool $ignoreTags = false): string
{
if (null === $this->data) {
return (string) (-1 - $this->additionalInformation);
}
$result = Utils::binToBigInteger($this->data);
$minusOne = BigInteger::of(-1);
return $minusOne->minus($result)->toBase(10);
}
private static function createBigInteger(BigInteger $integer): self
{
if ($integer->isGreaterThanOrEqualTo(BigInteger::zero())) {
throw new InvalidArgumentException('The value must be a negative integer.');
}
$minusOne = BigInteger::of(-1);
$computed_value = $minusOne->minus($integer);
switch (true) {
case $computed_value->isLessThan(BigInteger::of(24)):
$ai = $computed_value->toInt();
$data = null;
break;
case $computed_value->isLessThan(BigInteger::fromBase('FF', 16)):
$ai = 24;
$data = self::hex2bin(str_pad($computed_value->toBase(16), 2, '0', STR_PAD_LEFT));
break;
case $computed_value->isLessThan(BigInteger::fromBase('FFFF', 16)):
$ai = 25;
$data = self::hex2bin(str_pad($computed_value->toBase(16), 4, '0', STR_PAD_LEFT));
break;
case $computed_value->isLessThan(BigInteger::fromBase('FFFFFFFF', 16)):
$ai = 26;
$data = self::hex2bin(str_pad($computed_value->toBase(16), 8, '0', STR_PAD_LEFT));
break;
default:
throw new InvalidArgumentException('Out of range. Please use NegativeBigIntegerTag tag with ByteStringObject object instead.');
}
return new self($ai, $data);
}
private static function hex2bin(string $data): string
{
$result = hex2bin($data);
if (false === $result) {
throw new InvalidArgumentException('Unable to convert the data');
}
return $result;
}
}
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