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<?php
/**
* Class BitBuffer
*
* @filesource BitBuffer.php
* @created 25.11.2015
* @package chillerlan\QRCode\Helpers
* @author Smiley <[email protected]>
* @copyright 2015 Smiley
* @license MIT
*/
namespace chillerlan\QRCode\Helpers;
use function count, floor;
/**
* Holds the raw binary data
*/
final class BitBuffer{
/**
* The buffer content
*
* @var int[]
*/
protected array $buffer = [];
/**
* Length of the content (bits)
*/
protected int $length = 0;
/**
* clears the buffer
*/
public function clear():BitBuffer{
$this->buffer = [];
$this->length = 0;
return $this;
}
/**
* appends a sequence of bits
*/
public function put(int $num, int $length):BitBuffer{
for($i = 0; $i < $length; $i++){
$this->putBit((($num >> ($length - $i - 1)) & 1) === 1);
}
return $this;
}
/**
* appends a single bit
*/
public function putBit(bool $bit):BitBuffer{
$bufIndex = floor($this->length / 8);
if(count($this->buffer) <= $bufIndex){
$this->buffer[] = 0;
}
if($bit === true){
$this->buffer[(int)$bufIndex] |= (0x80 >> ($this->length % 8));
}
$this->length++;
return $this;
}
/**
* returns the current buffer length
*/
public function getLength():int{
return $this->length;
}
/**
* returns the buffer content
*/
public function getBuffer():array{
return $this->buffer;
}
}
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