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<?php /* vim: set expandtab sw=4 ts=4 sts=4: */
/**
* Output buffering wrapper
*
* @package PhpMyAdmin
*/
if (! defined('PHPMYADMIN')) {
exit;
}
/**
* Output buffering wrapper class
*
* @package PhpMyAdmin
*/
class PMA_OutputBuffering
{
private static $_instance;
private $_mode;
private $_content;
private $_on;
/**
* Initializes class
*/
private function __construct()
{
$this->_mode = $this->_getMode();
$this->_on = false;
}
/**
* This function could be used eventually to support more modes.
*
* @return integer the output buffer mode
*/
private function _getMode()
{
$mode = 0;
if ($GLOBALS['cfg']['OBGzip'] && function_exists('ob_start')) {
if (ini_get('output_handler') == 'ob_gzhandler') {
// If a user sets the output_handler in php.ini to ob_gzhandler, then
// any right frame file in phpMyAdmin will not be handled properly by
// the browser. My fix was to check the ini file within the
// PMA_outBufferModeGet() function.
$mode = 0;
} elseif (function_exists('ob_get_level') && ob_get_level() > 0) {
// happens when php.ini's output_buffering is not Off
ob_end_clean();
$mode = 1;
} else {
$mode = 1;
}
}
// Zero (0) is no mode or in other words output buffering is OFF.
// Follow 2^0, 2^1, 2^2, 2^3 type values for the modes.
// Useful if we ever decide to combine modes. Then a bitmask field of
// the sum of all modes will be the natural choice.
return $mode;
}
/**
* Returns the singleton PMA_OutputBuffering object
*
* @return PMA_OutputBuffering object
*/
public static function getInstance()
{
if (empty(self::$_instance)) {
self::$_instance = new PMA_OutputBuffering();
}
return self::$_instance;
}
/**
* This function will need to run at the top of all pages if output
* output buffering is turned on. It also needs to be passed $mode from
* the PMA_outBufferModeGet() function or it will be useless.
*
* @return void
*/
public function start()
{
if (! $this->_on) {
if ($this->_mode && function_exists('ob_gzhandler')) {
ob_start('ob_gzhandler');
}
ob_start();
if (! defined('TESTSUITE')) {
header('X-ob_mode: ' . $this->_mode);
}
register_shutdown_function('PMA_OutputBuffering::stop');
$this->_on = true;
}
}
/**
* This function will need to run at the bottom of all pages if output
* buffering is turned on. It also needs to be passed $mode from the
* PMA_outBufferModeGet() function or it will be useless.
*
* @return void
*/
public static function stop()
{
$buffer = PMA_OutputBuffering::getInstance();
if ($buffer->_on) {
$buffer->_on = false;
$buffer->_content = ob_get_contents();
ob_end_clean();
}
}
/**
* Gets buffer content
*
* @return string buffer content
*/
public function getContents()
{
return $this->_content;
}
/**
* Flushes output buffer
*
* @return void
*/
public function flush()
{
if (ob_get_status() && $this->_mode) {
ob_flush();
} else {
flush();
}
}
}
?>