<?php

declare(strict_types=1);

namespace GlobusStudio\QRCode\Encoder;

final class BitBuffer

{

/** @var int[] */

private array $buffer = [];

private int $length = 0;

/**

* @return int[]

*/

public function getBuffer(): array

{

return $this->buffer;

}

public function getLengthInBits(): int

{

return $this->length;

}

public function get(int $index): bool

{

$bufIndex = (int) ($index / 8);

return (($this->buffer[$bufIndex] >> (7 - $index % 8)) & 1) === 1;

}

public function put(int $num, int $length): void

{

for ($i = 0; $i < $length; $i++) {

$this->putBit((($num >> ($length - $i - 1)) & 1) === 1);

}

}

public function putBit(bool $bit): void

{

$bufIndex = (int) ($this->length / 8);

if (count($this->buffer) <= $bufIndex) {

$this->buffer[] = 0;

}

if ($bit) {

$this->buffer[$bufIndex] |= (0x80 >> ($this->length % 8));

}

$this->length++;

}

}