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<?php |
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|
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declare(strict_types=1); |
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|
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/* |
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* The MIT License (MIT) |
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* |
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* Copyright (c) 2018-2020 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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|
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namespace WP_DEFENDER_VENDOR\CBOR; |
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|
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use WP_DEFENDER_VENDOR\Brick\Math\BigInteger; |
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use function chr; |
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use function count; |
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use InvalidArgumentException; |
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use const STR_PAD_LEFT; |
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|
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final class LengthCalculator |
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{ |
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/** |
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* @return array{int, null|string} |
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*/ |
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public static function getLengthOfString(string $data): array |
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{ |
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$length = mb_strlen($data, '8bit'); |
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|
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return self::computeLength($length); |
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} |
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|
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/** |
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* @param array<int|string, mixed> $data |
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* |
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* @return array{int, null|string} |
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*/ |
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public static function getLengthOfArray(array $data): array |
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{ |
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$length = count($data); |
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|
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return self::computeLength($length); |
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} |
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|
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/** |
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* @return array{int, null|string} |
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*/ |
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private static function computeLength(int $length): array |
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{ |
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switch (true) { |
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case $length <= 23: |
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return [$length, null]; |
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case $length <= 0xFF: |
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return [CBORObject::LENGTH_1_BYTE, chr($length)]; |
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case $length <= 0xFFFF: |
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return [CBORObject::LENGTH_2_BYTES, self::hex2bin(dechex($length))]; |
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case $length <= 0xFFFFFFFF: |
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return [CBORObject::LENGTH_4_BYTES, self::hex2bin(dechex($length))]; |
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case BigInteger::of($length)->isLessThanOrEqualTo(BigInteger::fromBase('FFFFFFFFFFFFFFFF', 16)): |
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return [CBORObject::LENGTH_8_BYTES, self::hex2bin(dechex($length))]; |
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default: |
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return [CBORObject::LENGTH_INDEFINITE, null]; |
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} |
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} |
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|
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private static function hex2bin(string $data): string |
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{ |
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$data = str_pad($data, (int) (2 ** ceil(log(mb_strlen($data, '8bit'), 2))), '0', STR_PAD_LEFT); |
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$result = hex2bin($data); |
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if ($result === false) { |
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throw new InvalidArgumentException('Unable to convert the data'); |
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} |
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|
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return $result; |
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} |
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} |
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|
