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<?php |
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/** |
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* Async sockets |
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* |
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* @copyright Copyright (c) 2015-2016, Efimov Evgenij <[email protected]> |
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* |
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* This source file is subject to the MIT license that is bundled |
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* with this source code in the file LICENSE. |
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*/ |
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namespace AsyncSockets\Frame; |
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/** |
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* Class MarkerFramePicker |
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*/ |
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class MarkerFramePicker extends AbstractFramePicker |
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{ |
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/** |
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* Frame start byte sequence or null |
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* |
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* @var string|null |
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*/ |
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private $startMarker; |
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/** |
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* Frame end marker |
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* |
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* @var string |
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*/ |
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private $endMarker; |
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/** |
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* Offset to search for end marker during data handling |
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* |
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* @var int |
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*/ |
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private $startPos; |
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/** |
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* bool |
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* |
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* @var bool |
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*/ |
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private $isCaseSensitive; |
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/** |
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* MarkerFramePicker constructor. |
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* |
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* @param null|string $startMarker Start marker |
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* @param string $endMarker End marker |
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* @param bool $isCaseSensitive True, if case is important |
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*/ |
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public function __construct($startMarker, $endMarker, $isCaseSensitive = true) |
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{ |
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parent::__construct(); |
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$this->startMarker = $startMarker; |
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$this->endMarker = $endMarker; |
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$this->isCaseSensitive = $isCaseSensitive; |
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} |
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/** |
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* Find start of data in frame |
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* |
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* @param string $buffer Collected data for frame |
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* |
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* @return bool True if start of frame is found |
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*/ |
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protected function resolveStartOfFrame($buffer) |
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{ |
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if ($this->startPos !== null) { |
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return true; |
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} |
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if ($this->startMarker === null) { |
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$this->startPos = 0; |
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return true; |
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} |
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$pos = $this->findMarker($buffer, $this->startMarker); |
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if ($pos !== false) { |
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$this->startPos = $pos; |
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return true; |
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} |
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return false; |
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} |
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/** {@inheritdoc} */ |
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protected function doHandleData($chunk, $remoteAddress, &$buffer) |
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{ |
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$buffer .= $chunk; |
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if (!$this->resolveStartOfFrame($buffer)) { |
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return ''; |
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} |
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$pos = $this->findMarker($buffer, $this->endMarker, $this->startPos + strlen($this->startMarker)); |
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if ($pos === false) { |
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return ''; |
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} |
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$this->setFinished(true); |
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$result = substr($buffer, $pos + strlen($this->endMarker)); |
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$buffer = substr($buffer, $this->startPos, $pos + strlen($this->endMarker) - $this->startPos); |
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return $result !== false ? $result : ''; |
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} |
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/** {@inheritdoc} */ |
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protected function doCreateFrame($buffer, $remoteAddress) |
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{ |
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if ($this->isEof()) { |
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return new Frame($buffer, $remoteAddress); |
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} |
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$data = $this->startPos === null ? '' : substr($buffer, $this->startPos); |
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return new Frame($data, $remoteAddress); |
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} |
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/** |
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* Performs strpos or stripos according to case sensibility |
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* |
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* @param string $haystack Where find text |
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* @param string $needle What to find |
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* @param int $offset Start offset in $haystack |
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* |
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* @return bool|int |
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*/ |
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protected function findMarker($haystack, $needle, $offset = 0) |
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{ |
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return $this->isCaseSensitive ? |
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strpos($haystack, $needle, $offset) : |
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stripos($haystack, $needle, $offset); |
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} |
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} |
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|
edefimov /
async-sockets
