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<?php |
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declare(strict_types=1); |
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namespace Sysbot\Bin; |
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use ArithmeticError; |
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use BigInteger; |
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use Exception; |
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use OutOfRangeException; |
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use Sysbot\Bin\Common\BinaryUtils; |
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/** |
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* Class Deserializer |
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* @package Sysbot\Bin |
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*/ |
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class Deserializer |
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{ |
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use BinaryUtils; |
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/** |
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* @var int |
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*/ |
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protected int $offset = 0; |
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/** |
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* @param string $bytes |
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*/ |
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public function __construct(protected string $bytes) |
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{ |
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} |
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/** |
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* @return int |
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*/ |
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public function getOffset(): int |
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{ |
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return $this->offset; |
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} |
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/** |
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* @param int $offset |
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* @param int $whence |
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* @return $this |
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*/ |
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public function seek(int $offset, int $whence = SEEK_SET): self |
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{ |
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switch ($whence) { |
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case SEEK_CUR: |
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$offset += $this->offset; |
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break; |
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case SEEK_END: |
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if ($offset > 0) { |
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$offset = 0; |
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} |
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$offset = strlen($this->bytes) + $offset; |
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break; |
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default: |
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break; |
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} |
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$this->offset = $offset; |
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return $this; |
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} |
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/** |
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* Resets the offset. |
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* @return Deserializer |
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*/ |
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public function rewind(): self |
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{ |
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return $this->seek(0); |
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} |
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/** |
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* @param int $length |
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* @param bool $bigEndian |
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* @return string |
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* @throws OutOfRangeException |
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*/ |
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public function getBytes(int $length, bool $bigEndian = false): string |
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{ |
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$data = substr($this->bytes, $this->offset, $length); |
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$actual = strlen($data); |
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if ($actual < $length) { |
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$message = sprintf('Not enough data to read: expected %d bytes, but only %d received', $length, $actual); |
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throw new OutOfRangeException($message); |
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} |
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$this->offset += $length; |
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if ($bigEndian) { |
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$data = strrev($data); |
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} |
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return $data; |
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} |
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/** |
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* @param bool $bigEndian |
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* @return int |
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* @throws OutOfRangeException |
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*/ |
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public function readLong(bool $bigEndian = false): int |
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{ |
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$data = $this->getBytes(4, $bigEndian); |
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$result = self::unpack('V', $data); |
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if (null === $result) { |
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throw new ArithmeticError('Cannot de-serialize long'); |
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} |
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return $result; |
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} |
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/** |
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* @param bool $bigEndian |
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* @return int|BigInteger |
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* @throws OutOfRangeException |
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* @throws Exception |
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* @throws ArithmeticError |
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*/ |
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public function readLongLong(bool $bigEndian = false): int|BigInteger |
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{ |
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$data = $this->getBytes(8, $bigEndian); |
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$result = BigInteger::fromBytes(IS_BIG_ENDIAN ? $data : strrev($data)); |
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if (IS_32_BIT) { |
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return $result; |
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} |
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return $result->toInt(); |
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} |
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/** |
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* @return string |
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* @throws OutOfRangeException |
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*/ |
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public function readString(): string |
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{ |
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$len = ord($this->getBytes(1)); |
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if (254 < $len) { |
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$message = sprintf('Length too big: %d (max 254)', $len); |
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throw new OutOfRangeException($message); |
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} |
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if (254 == $len) { |
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$data = $this->getBytes(3); |
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$len = self::unpack('V', $data . chr(0)) + 1; |
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} |
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$result = $len ? $this->getBytes($len) : ''; |
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$this->offset += self::positiveModulo(-$len - 1, 4); |
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return $result; |
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} |
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/** |
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* @param string $format |
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* @param string $data |
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* @return mixed |
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*/ |
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public static function unpack(string $format, string $data): mixed |
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{ |
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$result = @unpack($format, $data); |
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if (false === $result) { |
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return null; |
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} |
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return $result[1] ?? null; |
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} |
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162
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} |
Sysbot-org /
bin
