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<?php declare(strict_types=1); namespace CBOR; use Brick\Math\BigInteger; use InvalidArgumentException; use function chr; use function count; use function strlen; use const STR_PAD_LEFT; final class LengthCalculator { /** * @return array{int, null|string} */ public static function getLengthOfString(string $data): array { $length = strlen($data); return self::computeLength($length); } /** * @param array<int|string, mixed> $data * * @return array{int, null|string} */ public static function getLengthOfArray(array $data): array { $length = count($data); return self::computeLength($length); } /** * @return array{int, null|string} */ private static function computeLength(int $length): array { return match (true) { $length <= 23 => [$length, null], $length <= 0xFF => [24, chr($length)], $length <= 0xFFFF => [25, self::hex2bin(dechex($length))], $length <= 0xFFFFFFFF => [26, self::hex2bin(dechex($length))], BigInteger::of($length)->isLessThan(BigInteger::fromBase('FFFFFFFFFFFFFFFF', 16)) => [ 27, self::hex2bin(dechex($length)), ], default => [31, null], }; } private static function hex2bin(string $data): string { $data = str_pad($data, (int) (2 ** ceil(log(strlen($data), 2))), '0', STR_PAD_LEFT); $result = hex2bin($data); if ($result === false) { throw new InvalidArgumentException('Unable to convert the data'); } return $result; } }
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