%PDF-
%PDF-
Mini Shell
Mini Shell
<?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;
}
}
Zerion Mini Shell 1.0