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<?php |
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declare(strict_types=1); |
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namespace Hyphper\Frame; |
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use Hyphper\Frame\Exception\InvalidFrameException; |
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/** |
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* The WINDOW_UPDATE frame is used to implement flow control. |
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* Flow control operates at two levels: on each individual stream and on the |
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* entire connection. |
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* |
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* Both types of flow control are hop by hop; that is, only between the two |
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* endpoints. Intermediaries do not forward WINDOW_UPDATE frames between |
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* dependent connections. However, throttling of data transfer by any receiver |
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* can indirectly cause the propagation of flow control information toward the |
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* original sender. |
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* |
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* @package Hyphper\Frame |
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*/ |
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class WindowUpdateFrame extends \Hyphper\Frame |
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{ |
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protected $defined_flags = []; |
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protected $type = 0x08; |
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protected $stream_association = self::EITHER_STREAM; |
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protected $window_increment; |
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/** |
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* WindowUpdateFrame constructor. |
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* |
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* @param array $options |
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*/ |
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public function __construct(array $options = []) |
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{ |
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parent::__construct($options); |
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$this->window_increment = $options['window_increment'] ?? 0; |
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} |
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/** |
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* @return string |
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*/ |
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1 |
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public function serializeBody(): string |
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{ |
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1 |
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return pack('N', $this->window_increment & 0x7FFFFFFF); |
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} |
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/** |
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* Given the body of a frame, parses it into frame data. This populates |
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* the non-header parts of the frame: that is, it does not populate the |
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* stream ID or flags. |
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* |
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* |
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* @param string $data |
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* |
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* @return void |
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*/ |
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public function parseBody(string $data) |
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{ |
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if (!$unpack = @unpack('Nwindow_increment', $data)) { |
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throw new InvalidFrameException('Invalid WINDOW_UPDATE body'); |
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} |
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$this->window_increment = $unpack['window_increment']; |
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1 |
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$this->body_len = strlen($data); |
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1 |
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} |
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/** |
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* @param int|mixed $window_increment |
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* |
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* @return WindowUpdateFrame |
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*/ |
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1 |
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public function setWindowIncrement($window_increment) |
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{ |
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$this->window_increment = $window_increment; |
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1 |
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return $this; |
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} |
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/** |
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* @return int|mixed |
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*/ |
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1 |
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public function getWindowIncrement() |
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{ |
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1 |
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return $this->window_increment; |
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} |
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} |
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hyphper /
h2-frame
