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