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LengthCalculator.php
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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 function chr; use function count; use InvalidArgumentException; final class LengthCalculator { public static function getLengthOfString(string $data): array { $length = mb_strlen($data, '8bit'); return self::computeLength($length); } public static function getLengthOfArray(array $data): array { $length = count($data); return self::computeLength($length); } private static function computeLength(int $length): array { switch (true) { case $length < 24: return [$length, null]; case $length < 0xFF: return [24, chr($length)]; case $length < 0xFFFF: return [25, self::hex2bin(static::fixHexLength(Utils::intToHex($length)))]; case $length < 0xFFFFFFFF: return [26, self::hex2bin(static::fixHexLength(Utils::intToHex($length)))]; case BigInteger::of($length)->isLessThan(BigInteger::fromBase('FFFFFFFFFFFFFFFF', 16)): return [27, self::hex2bin(static::fixHexLength(Utils::intToHex($length)))]; default: return [31, null]; } } private static function hex2bin(string $data): string { $result = hex2bin($data); if (false === $result) { throw new InvalidArgumentException('Unable to convert the data'); } return $result; } private static function fixHexLength(string $data): string { return str_pad($data, (int) (2 ** ceil(log(mb_strlen($data, '8bit'), 2))), '0', STR_PAD_LEFT); } }