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<?php |
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/* |
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* This file is part of the ManageWP Worker plugin. |
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* |
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* (c) ManageWP LLC <contact@managewp.com> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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|
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class MWP_Stream_Buffer |
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{ |
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|
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private $hwm; |
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|
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private $buffer = ''; |
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|
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/** |
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* @param int $hwm High water mark, representing the preferred maximum |
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* buffer size. If the size of the buffer exceeds the high |
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* water mark, then calls to write will continue to succeed |
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* but will return false to inform writers to slow down |
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* until the buffer has been drained by reading from it. |
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*/ |
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public function __construct($hwm = 16384) |
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{ |
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$this->hwm = $hwm; |
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} |
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|
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public function close() |
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{ |
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$this->buffer = ''; |
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} |
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|
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public function isSeekable() |
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{ |
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return false; |
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} |
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|
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public function seek($offset, $whence = SEEK_SET) |
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{ |
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return false; |
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} |
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|
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public function eof() |
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{ |
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return strlen($this->buffer) === 0; |
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} |
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|
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public function tell() |
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{ |
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return false; |
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} |
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|
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/** |
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* Reads data from the buffer. |
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* |
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* @param $length |
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* |
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* @return string |
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*/ |
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public function read($length) |
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{ |
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$currentLength = strlen($this->buffer); |
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|
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if ($length >= $currentLength) { |
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// No need to slice the buffer because we don't have enough data. |
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$result = $this->buffer; |
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$this->buffer = ''; |
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} else { |
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// Slice up the result to provide a subset of the buffer. |
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$result = substr($this->buffer, 0, $length); |
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$this->buffer = substr($this->buffer, $length); |
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} |
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|
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return $result; |
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} |
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|
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/** |
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* Writes data to the buffer. |
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* |
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* @param $string |
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* |
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* @return bool|int |
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*/ |
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public function write($string) |
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{ |
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$this->buffer .= $string; |
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|
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if (strlen($this->buffer) >= $this->hwm) { |
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return false; |
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} |
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|
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return strlen($string); |
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} |
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} |
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|
