system/core/Output.php

.htaccess
PHPMailer
    .gitignore
    .scrutinizer.yml
    .travis.yml
    LICENSE
    PHPMailerAutoload.php
    README.md
    VERSION
    changelog.md
    class.phpmailer.php
    class.pop3.php
    class.smtp.php
    composer.json
    docs
        Callback_function_notes.txt
        DomainKeys_notes.txt
        Note_for_SMTP_debugging.txt
        extending.html
        faq.html
        generatedocs.sh
        pop3_article.txt
    examples
        code_generator.phps
        contents.html
        contentsutf8.html
        exceptions.phps
        gmail.phps
        images
            phpmailer.png
            phpmailer_mini.png
        index.html
        mail.phps
        mailing_list.phps
        pop_before_smtp.phps
        scripts
            XRegExp.js
            shAutoloader.js
            shBrushPhp.js
            shCore.js
            shLegacy.js
        send_file_upload.phps
        sendmail.phps
        smtp.phps
        smtp_check.phps
        smtp_no_auth.phps
        ssl_options.phps
        styles
            shCore.css
            shCoreDefault.css
            shCoreDjango.css
            shCoreEclipse.css
            shCoreEmacs.css
            shCoreFadeToGrey.css
            shCoreMDUltra.css
            shCoreMidnight.css
            shCoreRDark.css
            shThemeAppleScript.css
            shThemeDefault.css
            shThemeDjango.css
            shThemeEclipse.css
            shThemeEmacs.css
            shThemeFadeToGrey.css
            shThemeMDUltra.css
            shThemeMidnight.css
            shThemeRDark.css
            shThemeVisualStudio.css
            wrapping.png
    extras
        EasyPeasyICS.php
        README.md
        htmlfilter.php
        ntlm_sasl_client.php
    language
        phpmailer.lang-am.php
        phpmailer.lang-ar.php
        phpmailer.lang-az.php
        phpmailer.lang-be.php
        phpmailer.lang-bg.php
        phpmailer.lang-br.php
        phpmailer.lang-ca.php
        phpmailer.lang-ch.php
        phpmailer.lang-cz.php
        phpmailer.lang-de.php
        phpmailer.lang-dk.php
        phpmailer.lang-el.php
        phpmailer.lang-eo.php
        phpmailer.lang-es.php
        phpmailer.lang-et.php
        phpmailer.lang-fa.php
        phpmailer.lang-fi.php
        phpmailer.lang-fo.php
        phpmailer.lang-fr.php
        phpmailer.lang-gl.php
        phpmailer.lang-he.php
        phpmailer.lang-hr.php
        phpmailer.lang-hu.php
        phpmailer.lang-id.php
        phpmailer.lang-it.php
        phpmailer.lang-ja.php
        phpmailer.lang-ka.php
        phpmailer.lang-ko.php
        phpmailer.lang-lt.php
        phpmailer.lang-lv.php
        phpmailer.lang-ms.php
        phpmailer.lang-nl.php
        phpmailer.lang-no.php
        phpmailer.lang-pl.php
        phpmailer.lang-pt.php
        phpmailer.lang-ro.php
        phpmailer.lang-ru.php
        phpmailer.lang-se.php
        phpmailer.lang-sk.php
        phpmailer.lang-sl.php
        phpmailer.lang-sr.php
        phpmailer.lang-tr.php
        phpmailer.lang-uk.php
        phpmailer.lang-vi.php
        phpmailer.lang-zh.php
        phpmailer.lang-zh_cn.php
    test
        bootstrap.php
        fakepopserver.sh
        fakesendmail.sh
        phpmailerLangTest.php
        phpmailerTest.php
        runfakepopserver.sh
        test_callback.php
        testbootstrap-dist.php
    travis.phpunit.xml.dist
application
    .htaccess
    cache
        .htaccess
        index.html
    config
        autoload.php
        config.php
        constants.php
        database.php
        doctypes.php
        foreign_chars.php
        hooks.php
        index.html
        memcached.php
        migration.php
        mimes.php
        profiler.php
        routes.php
        smileys.php
        user_agents.php
    controllers
        Check.php
        Systemid.php
        index.html
    core
        index.html
    errors
        error_404.php
        error_db.php
        error_general.php
        error_php.php
        index.html
    helpers
        index.html
    hooks
        index.html
    index.html
    language
        english
            index.html
            system_lang.php
        index.html
        polish
            .gitattributes
            README.md
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            system_lang.php
            unit_test_lang.php
            upload_lang.php
    libraries
        index.html
    logs
        index.html
    models
        System_model.php
        index.html
    third_party
        index.html
    views
        components.php
        errors
            cli
                error_404.php
                error_db.php
                error_exception.php
                error_general.php
                error_php.php
                index.html
            html
                error_404.php
                error_db.php
                error_exception.php
                error_general.php
                error_php.php
                index.html
            index.html
        foot.php
        head.php
        index.html
        login.php
        project
            add.php
            addkeyword.php
            details.php
            edit.php
            show.php
        proxy
            proxy.php
            proxyadd.php
            proxyedit.php
        user
            changepassword.php
            editemail.php
            getpassword.php
            postpassword.php
            settings.php
        welcome_message.php
arial.ttf
captcha
cookiefile
css
    bootstrap-theme.css
    bootstrap-theme.css.map
    bootstrap-theme.min.css
    bootstrap-theme.min.css.map
    bootstrap.css
    bootstrap.css.map
    bootstrap.min.css
    bootstrap.min.css.map
favicon.ico
fonts
    glyphicons-halflings-regular.eot
    glyphicons-halflings-regular.svg
    glyphicons-halflings-regular.ttf
    glyphicons-halflings-regular.woff
    glyphicons-halflings-regular.woff2
getpozition.png
index.php
install.php
jquery-latest.min.js
js
    bootstrap.js
    bootstrap.min.js
    npm.js
library
    ajax-loader.gif
    crop
        Canvas.php
        Coordinate.php
        Exception.php
        Font
            GDF.php
            PS.php
            TTF.php
        Image.php
        Mapper
            BMP.php
            GD.php
            GD2.php
            GIF.php
            JPEG.php
            PNG.php
            TGA.php
        MapperFactory.php
        Operation
            AddNoise.php
            ApplyConvolution.php
            ApplyFilter.php
            ApplyMask.php
            AsGrayscale.php
            AsNegative.php
            AutoCrop.php
            CopyChannelsPalette.php
            CopyChannelsTrueColor.php
            CorrectGamma.php
            Crop.php
            Flip.php
            GetMask.php
            Merge.php
            Mirror.php
            Resize.php
            ResizeCanvas.php
            Rotate.php
            RoundCorners.php
            Unsharp.php
        OperationFactory.php
        PaletteImage.php
        README
        TrueColorImage.php
        VERSION
        WideImage.php
        gpl.txt
        lgpl.txt
        vendor
            de77
                BMP.php
                TGA.php
    index.html
    jquery-autocomplete
        changelog.txt
        demo
            bg.gif
            emails.php
            emails.phps
            images
                Amsterdam Van-Gogh Museum.jpg
                Amsterdam.jpg
                Antwerpen Rubenshaus.jpg
                Antwerpen.jpg
                Appenzell.jpg
                Arnhem Historisches Museum.jpg
                Bled.jpg
                Bled_Die Burg von Bled.jpg
                Bogojina_Die Pfarrkirche.jpg
                BolognaBasilicadiSanPetronio.jpg
                BolognaFontanadelNettuno.jpg
                BolognaPiazzaMaggiore.jpg
                Bolsward Martinikerk.jpg
                Bolsward Stadhuis.jpg
                Bolsward.jpg
                BordeauxND.jpg
                BordeauxPlaceB.jpg
                BotanischerGartenZuerich.jpg
                Bouillon.jpg
                Gent Hotel de Ville2.jpg
                Gent.jpg
                GenuaStrand.jpg
                GenuabeiNacht.jpg
                Giessbachfaelle Brienz.jpg
                Giethoorn.jpg
                Gnesen.jpg
                Gornij Grad_KATHEDRALE.jpg
                Gossensass.jpg
                Grad_Burg Grad2.jpg
                GrandDixence.jpg
                GrenoblePanorama.jpg
                Groningen.jpg
                GrottenvonReclere.jpg
                Guebwiller.jpg
                Kamnik_Die Franziskaner Bibliothek.jpg
                Karlsbad Muehlbrunnkolonnade.jpg
                Kazimierz.jpg
                KirchbergAltesRathaus1.jpg
                KlagenfurtDom.jpg
                KleineMeerjungfreu.jpg
                LazienkiparkWarschau.jpg
                LeHavreHafen.jpg
                LeMans.jpg
                Lednice.jpg
                Leeuwarden Fries Museum.jpg
                Leeuwarden.jpg
                Lelystad.jpg
                Lemmer.jpg
                Leper Halles aux draps.jpg
                Leuven Museum fuer Kirchenkunst.jpg
                Leuven.jpg
                Luxemburg.jpg
                LuzernAltstadt.jpg
                LuzernPicassoMuseum.jpg
                Lyon.jpg
                Maastricht Onze Lieve Vrou...jpg
                Maastricht St Servaasbasiliek.jpg
                Maastricht Walmuur.jpg
                Maastricht.jpg
                MagiatalMaggia.jpg
                Mailand3.jpg
                Metlika_Bela Krajina Museum.jpg
                MilanoCastelloSforzesco.jpg
                MilanoDom.jpg
                MilazzoBurg.jpg
                Novo Mesto_Das Museum.jpg
                ObervellachBurgFalkenstein.jpg
                OdenseeAndersen.jpg
                Olimje_Kirche und Apotheke in Olimje.jpg
                Olomouc.jpg
                OlympischesMuseumLausanne.jpg
                OrleansMaisonJeannedArc.jpg
                OrleansParcFloraldelaSource.jpg
                OstiaAntica.jpg
                Ostrow Tumski.jpg
                PoertschachSchlossLeonstain.jpg
                Portoroz.jpg
                Posen.jpg
                Postojna.jpg
                Prag Altstaedter Ring.jpg
                Prag Waldsteinpalais.jpg
                RouenNotreDame.jpg
                Salzbergwerk Bex.jpg
                SalzbergwerkWieliczka.jpg
                SalzburgFestungHohensalzburg.jpg
                SalzburgResidenz.jpg
                WienMuseumsQuartier.jpg
                WienMusikverein.jpg
                WienRiesenrad.jpg
                WienRingstrasse.jpg
            images.php
            index.html
            indicator.gif
            json.html
            localdata.js
            main.css
            search.php
            search.phps
        jquery.autocomplete.css
        jquery.autocomplete.js
        jquery.autocomplete.min.js
        jquery.autocomplete.pack.js
        lib
            jquery.ajaxQueue.js
            jquery.bgiframe.min.js
            jquery.js
            thickbox-compressed.js
            thickbox.css
        todo
    jquery-ui-sliderAccess.js
    jquery-ui-timepicker-addon.css
    jquery-ui-timepicker-addon.js
    jquery-ui.css
    jquery-ui.min.js
    jquery.min.js
    jscolor
        arrow.gif
        cross.gif
        demo.html
        hs.png
        hv.png
        jscolor.js
    style.css
script.js
specialchars.txt
stylesmenu.css
system
    .htaccess
    core
        Benchmark.php
        CodeIgniter.php
        Common.php
        Config.php
        Controller.php
        Exceptions.php
        Hooks.php
        Input.php
        Lang.php
        Loader.php
        Log.php
        Model.php
        Output.php
        Router.php
        Security.php
        URI.php
        Utf8.php
        compat
            hash.php
            index.html
            mbstring.php
            password.php
            standard.php
        index.html
    database
        DB.php
        DB_active_rec.php
        DB_cache.php
        DB_driver.php
        DB_forge.php
        DB_query_builder.php
        DB_result.php
        DB_utility.php
        drivers
            cubrid
                cubrid_driver.php
                cubrid_forge.php
                cubrid_result.php
                cubrid_utility.php
                index.html
            ibase
                ibase_driver.php
                ibase_forge.php
                ibase_result.php
                ibase_utility.php
                index.html
            index.html
            mssql
                index.html
                mssql_driver.php
                mssql_forge.php
                mssql_result.php
                mssql_utility.php
            mysql
                index.html
                mysql_driver.php
                mysql_forge.php
                mysql_result.php
                mysql_utility.php
            mysqli
                index.html
                mysqli_driver.php
                mysqli_forge.php
                mysqli_result.php
                mysqli_utility.php
            oci8
                index.html
                oci8_driver.php
                oci8_forge.php
                oci8_result.php
                oci8_utility.php
            odbc
                index.html
                odbc_driver.php
                odbc_forge.php
                odbc_result.php
                odbc_utility.php
            pdo
                index.html
                pdo_driver.php
                pdo_forge.php
                pdo_result.php
                pdo_utility.php
                subdrivers
                    index.html
                    pdo_4d_driver.php
                    pdo_4d_forge.php
                    pdo_cubrid_driver.php
                    pdo_cubrid_forge.php
                    pdo_dblib_driver.php
                    pdo_dblib_forge.php
                    pdo_firebird_driver.php
                    pdo_firebird_forge.php
                    pdo_ibm_driver.php
                    pdo_ibm_forge.php
                    pdo_informix_driver.php
                    pdo_informix_forge.php
                    pdo_mysql_driver.php
                    pdo_mysql_forge.php
                    pdo_oci_driver.php
                    pdo_oci_forge.php
                    pdo_odbc_driver.php
                    pdo_odbc_forge.php
                    pdo_pgsql_driver.php
                    pdo_pgsql_forge.php
                    pdo_sqlite_driver.php
                    pdo_sqlite_forge.php
                    pdo_sqlsrv_driver.php
                    pdo_sqlsrv_forge.php
            postgre
                index.html
                postgre_driver.php
                postgre_forge.php
                postgre_result.php
                postgre_utility.php
            sqlite
                index.html
                sqlite_driver.php
                sqlite_forge.php
                sqlite_result.php
                sqlite_utility.php
            sqlite3
                index.html
                sqlite3_driver.php
                sqlite3_forge.php
                sqlite3_result.php
                sqlite3_utility.php
            sqlsrv
                index.html
                sqlsrv_driver.php
                sqlsrv_forge.php
                sqlsrv_result.php
                sqlsrv_utility.php
        index.html
    fonts
        index.html
        texb.ttf
    helpers
        array_helper.php
        captcha_helper.php
        cookie_helper.php
        date_helper.php
        directory_helper.php
        download_helper.php
        email_helper.php
        file_helper.php
        form_helper.php
        html_helper.php
        index.html
        inflector_helper.php
        language_helper.php
        number_helper.php
        path_helper.php
        security_helper.php
        smiley_helper.php
        string_helper.php
        text_helper.php
        typography_helper.php
        url_helper.php
        xml_helper.php
    index.html
    language
        english
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        index.html
    libraries
        Cache
            Cache.php
            drivers
                Cache_apc.php
                Cache_dummy.php
                Cache_file.php
                Cache_memcached.php
                Cache_redis.php
                Cache_wincache.php
                index.html
            index.html
        Calendar.php
        Cart.php
        Driver.php
        Email.php
        Encrypt.php
        Encryption.php
        Form_validation.php
        Ftp.php
        Image_lib.php
        Javascript
            Jquery.php
            index.html
        Javascript.php
        Log.php
        Migration.php
        Pagination.php
        Parser.php
        Profiler.php
        Session
            Session.php
            SessionHandlerInterface.php
            Session_driver.php
            drivers
                Session_database_driver.php
                Session_files_driver.php
                Session_memcached_driver.php
                Session_redis_driver.php
                index.html
            index.html
        Session.php
        Sha1.php
        Table.php
        Trackback.php
        Typography.php
        Unit_test.php
        Upload.php
        User_agent.php
        Xmlrpc.php
        Xmlrpcs.php
        Zip.php
        index.html
uploads
<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2016, British Columbia Institute of Technology
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @package	CodeIgniter
 * @author	EllisLab Dev Team
 * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
 * @copyright	Copyright (c) 2014 - 2016, British Columbia Institute of Technology (http://bcit.ca/)
 * @license	http://opensource.org/licenses/MIT	MIT License
 * @link	https://codeigniter.com
 * @since	Version 1.0.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * Output Class
 *
 * Responsible for sending final output to the browser.
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @category	Output
 * @author		EllisLab Dev Team
 * @link		https://codeigniter.com/user_guide/libraries/output.html
 */
class CI_Output {

	/**
	 * Final output string
	 *
	 * @var	string
	 */
	public $final_output;

	/**
	 * Cache expiration time
	 *
	 * @var	int
	 */
	public $cache_expiration = 0;

	/**
	 * List of server headers
	 *
	 * @var	array
	 */
	public $headers = array();

	/**
	 * List of mime types
	 *
	 * @var	array
	 */
	public $mimes =	array();

	/**
	 * Mime-type for the current page
	 *
	 * @var	string
	 */
	protected $mime_type = 'text/html';

	/**
	 * Enable Profiler flag
	 *
	 * @var	bool
	 */
	public $enable_profiler = FALSE;

	/**
	 * php.ini zlib.output_compression flag
	 *
	 * @var	bool
	 */
	protected $_zlib_oc = FALSE;

	/**
	 * CI output compression flag
	 *
	 * @var	bool
	 */
	protected $_compress_output = FALSE;

	/**
	 * List of profiler sections
	 *
	 * @var	array
	 */
	protected $_profiler_sections =	array();

	/**
	 * Parse markers flag
	 *
	 * Whether or not to parse variables like 0.0437 and {memory_usage}.
	 *
	 * @var	bool
	 */
	public $parse_exec_vars = TRUE;

	/**
	 * Class constructor
	 *
	 * Determines whether zLib output compression will be used.
	 *
	 * @return	void
	 */
	public function __construct()
	{
		$this->_zlib_oc = (bool) ini_get('zlib.output_compression');
		$this->_compress_output = (
			$this->_zlib_oc === FALSE
			&& config_item('compress_output') === TRUE
			&& extension_loaded('zlib')
		);

		// Get mime types for later
		$this->mimes =& get_mimes();

		log_message('info', 'Output Class Initialized');
	}

	// --------------------------------------------------------------------

	/**
	 * Get Output
	 *
	 * Returns the current output string.
	 *
	 * @return	string
	 */
	public function get_output()
	{
		return $this->final_output;
	}

	// --------------------------------------------------------------------

	/**
	 * Set Output
	 *
	 * Sets the output string.
	 *
	 * @param	string	$output	Output data
	 * @return	CI_Output
	 */
	public function set_output($output)
	{
		$this->final_output = $output;
		return $this;
	}

	// --------------------------------------------------------------------

	/**
	 * Append Output
	 *
	 * Appends data onto the output string.
	 *
	 * @param	string	$output	Data to append
	 * @return	CI_Output
	 */
	public function append_output($output)
	{
		$this->final_output .= $output;
		return $this;
	}

	// --------------------------------------------------------------------

	/**
	 * Set Header
	 *
	 * Lets you set a server header which will be sent with the final output.
	 *
	 * Note: If a file is cached, headers will not be sent.
	 * @todo	We need to figure out how to permit headers to be cached.
	 *
	 * @param	string	$header		Header
	 * @param	bool	$replace	Whether to replace the old header value, if already set
	 * @return	CI_Output
	 */
	public function set_header($header, $replace = TRUE)
	{
		// If zlib.output_compression is enabled it will compress the output,
		// but it will not modify the content-length header to compensate for
		// the reduction, causing the browser to hang waiting for more data.
		// We'll just skip content-length in those cases.
		if ($this->_zlib_oc && strncasecmp($header, 'content-length', 14) === 0)
		{
			return $this;
		}

		$this->headers[] = array($header, $replace);
		return $this;
	}

	// --------------------------------------------------------------------

	/**
	 * Set Content-Type Header
	 *
	 * @param	string	$mime_type	Extension of the file we're outputting
	 * @param	string	$charset	Character set (default: NULL)
	 * @return	CI_Output
	 */
	public function set_content_type($mime_type, $charset = NULL)
	{
		if (strpos($mime_type, '/') === FALSE)
		{
			$extension = ltrim($mime_type, '.');

			// Is this extension supported?
			if (isset($this->mimes[$extension]))
			{
				$mime_type =& $this->mimes[$extension];

				if (is_array($mime_type))
				{
					$mime_type = current($mime_type);
				}
			}
		}

		$this->mime_type = $mime_type;

		if (empty($charset))
		{
			$charset = config_item('charset');
		}

		$header = 'Content-Type: '.$mime_type
			.(empty($charset) ? '' : '; charset='.$charset);

		$this->headers[] = array($header, TRUE);
		return $this;
	}

	// --------------------------------------------------------------------

	/**
	 * Get Current Content-Type Header
	 *
	 * @return	string	'text/html', if not already set
	 */
	public function get_content_type()
	{
		for ($i = 0, $c = count($this->headers); $i < $c; $i++)
		{
			if (sscanf($this->headers[$i][0], 'Content-Type: %[^;]', $content_type) === 1)
			{
				return $content_type;
			}
		}

		return 'text/html';
	}

	// --------------------------------------------------------------------

	/**
	 * Get Header
	 *
	 * @param	string	$header_name
	 * @return	string
	 */
	public function get_header($header)
	{
		// Combine headers already sent with our batched headers
		$headers = array_merge(
			// We only need [x][0] from our multi-dimensional array
			array_map('array_shift', $this->headers),
			headers_list()
		);

		if (empty($headers) OR empty($header))
		{
			return NULL;
		}

		for ($i = 0, $c = count($headers); $i < $c; $i++)
		{
			if (strncasecmp($header, $headers[$i], $l = strlen($header)) === 0)
			{
				return trim(substr($headers[$i], $l+1));
			}
		}

		return NULL;
	}

	// --------------------------------------------------------------------

	/**
	 * Set HTTP Status Header
	 *
	 * As of version 1.7.2, this is an alias for common function
	 * set_status_header().
	 *
	 * @param	int	$code	Status code (default: 200)
	 * @param	string	$text	Optional message
	 * @return	CI_Output
	 */
	public function set_status_header($code = 200, $text = '')
	{
		set_status_header($code, $text);
		return $this;
	}

	// --------------------------------------------------------------------

	/**
	 * Enable/disable Profiler
	 *
	 * @param	bool	$val	TRUE to enable or FALSE to disable
	 * @return	CI_Output
	 */
	public function enable_profiler($val = TRUE)
	{
		$this->enable_profiler = is_bool($val) ? $val : TRUE;
		return $this;
	}

	// --------------------------------------------------------------------

	/**
	 * Set Profiler Sections
	 *
	 * Allows override of default/config settings for
	 * Profiler section display.
	 *
	 * @param	array	$sections	Profiler sections
	 * @return	CI_Output
	 */
	public function set_profiler_sections($sections)
	{
		if (isset($sections['query_toggle_count']))
		{
			$this->_profiler_sections['query_toggle_count'] = (int) $sections['query_toggle_count'];
			unset($sections['query_toggle_count']);
		}

		foreach ($sections as $section => $enable)
		{
			$this->_profiler_sections[$section] = ($enable !== FALSE);
		}

		return $this;
	}

	// --------------------------------------------------------------------

	/**
	 * Set Cache
	 *
	 * @param	int	$time	Cache expiration time in minutes
	 * @return	CI_Output
	 */
	public function cache($time)
	{
		$this->cache_expiration = is_numeric($time) ? $time : 0;
		return $this;
	}

	// --------------------------------------------------------------------

	/**
	 * Display Output
	 *
	 * Processes and sends finalized output data to the browser along
	 * with any server headers and profile data. It also stops benchmark
	 * timers so the page rendering speed and memory usage can be shown.
	 *
	 * Note: All "view" data is automatically put into $this->final_output
	 *	 by controller class.
	 *
	 * @uses	CI_Output::$final_output
	 * @param	string	$output	Output data override
	 * @return	void
	 */
	public function _display($output = '')
	{
		// Note:  We use load_class() because we can't use $CI =& get_instance()
		// since this function is sometimes called by the caching mechanism,
		// which happens before the CI super object is available.
		$BM =& load_class('Benchmark', 'core');
		$CFG =& load_class('Config', 'core');

		// Grab the super object if we can.
		if (class_exists('CI_Controller', FALSE))
		{
			$CI =& get_instance();
		}

		// --------------------------------------------------------------------

		// Set the output data
		if ($output === '')
		{
			$output =& $this->final_output;
		}

		// --------------------------------------------------------------------

		// Do we need to write a cache file? Only if the controller does not have its
		// own _output() method and we are not dealing with a cache file, which we
		// can determine by the existence of the $CI object above
		if ($this->cache_expiration > 0 && isset($CI) && ! method_exists($CI, '_output'))
		{
			$this->_write_cache($output);
		}

		// --------------------------------------------------------------------

		// Parse out the elapsed time and memory usage,
		// then swap the pseudo-variables with the data

		$elapsed = $BM->elapsed_time('total_execution_time_start', 'total_execution_time_end');

		if ($this->parse_exec_vars === TRUE)
		{
			$memory	= round(memory_get_usage() / 1024 / 1024, 2).'MB';
			$output = str_replace(array('0.0437', '{memory_usage}'), array($elapsed, $memory), $output);
		}

		// --------------------------------------------------------------------

		// Is compression requested?
		if (isset($CI) // This means that we're not serving a cache file, if we were, it would already be compressed
			&& $this->_compress_output === TRUE
			&& isset($_SERVER['HTTP_ACCEPT_ENCODING']) && strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') !== FALSE)
		{
			ob_start('ob_gzhandler');
		}

		// --------------------------------------------------------------------

		// Are there any server headers to send?
		if (count($this->headers) > 0)
		{
			foreach ($this->headers as $header)
			{
				@header($header[0], $header[1]);
			}
		}

		// --------------------------------------------------------------------

		// Does the $CI object exist?
		// If not we know we are dealing with a cache file so we'll
		// simply echo out the data and exit.
		if ( ! isset($CI))
		{
			if ($this->_compress_output === TRUE)
			{
				if (isset($_SERVER['HTTP_ACCEPT_ENCODING']) && strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') !== FALSE)
				{
					header('Content-Encoding: gzip');
					header('Content-Length: '.strlen($output));
				}
				else
				{
					// User agent doesn't support gzip compression,
					// so we'll have to decompress our cache
					$output = gzinflate(substr($output, 10, -8));
				}
			}

			echo $output;
			log_message('info', 'Final output sent to browser');
			log_message('debug', 'Total execution time: '.$elapsed);
			return;
		}

		// --------------------------------------------------------------------

		// Do we need to generate profile data?
		// If so, load the Profile class and run it.
		if ($this->enable_profiler === TRUE)
		{
			$CI->load->library('profiler');
			if ( ! empty($this->_profiler_sections))
			{
				$CI->profiler->set_sections($this->_profiler_sections);
			}

			// If the output data contains closing </body> and </html> tags
			// we will remove them and add them back after we insert the profile data
			$output = preg_replace('|</body>.*?</html>|is', '', $output, -1, $count).$CI->profiler->run();
			if ($count > 0)
			{
				$output .= '</body></html>';
			}
		}

		// Does the controller contain a function named _output()?
		// If so send the output there.  Otherwise, echo it.
		if (method_exists($CI, '_output'))
		{
			$CI->_output($output);
		}
		else
		{
			echo $output; // Send it to the browser!
		}

		log_message('info', 'Final output sent to browser');
		log_message('debug', 'Total execution time: '.$elapsed);
	}

	// --------------------------------------------------------------------

	/**
	 * Write Cache
	 *
	 * @param	string	$output	Output data to cache
	 * @return	void
	 */
	public function _write_cache($output)
	{
		$CI =& get_instance();
		$path = $CI->config->item('cache_path');
		$cache_path = ($path === '') ? APPPATH.'cache/' : $path;

		if ( ! is_dir($cache_path) OR ! is_really_writable($cache_path))
		{
			log_message('error', 'Unable to write cache file: '.$cache_path);
			return;
		}

		$uri = $CI->config->item('base_url')
			.$CI->config->item('index_page')
			.$CI->uri->uri_string();

		if (($cache_query_string = $CI->config->item('cache_query_string')) && ! empty($_SERVER['QUERY_STRING']))
		{
			if (is_array($cache_query_string))
			{
				$uri .= '?'.http_build_query(array_intersect_key($_GET, array_flip($cache_query_string)));
			}
			else
			{
				$uri .= '?'.$_SERVER['QUERY_STRING'];
			}
		}

		$cache_path .= md5($uri);

		if ( ! $fp = @fopen($cache_path, 'w+b'))
		{
			log_message('error', 'Unable to write cache file: '.$cache_path);
			return;
		}

		if (flock($fp, LOCK_EX))
		{
			// If output compression is enabled, compress the cache
			// itself, so that we don't have to do that each time
			// we're serving it
			if ($this->_compress_output === TRUE)
			{
				$output = gzencode($output);

				if ($this->get_header('content-type') === NULL)
				{
					$this->set_content_type($this->mime_type);
				}
			}

			$expire = time() + ($this->cache_expiration * 60);

			// Put together our serialized info.
			$cache_info = serialize(array(
				'expire'	=> $expire,
				'headers'	=> $this->headers
			));

			$output = $cache_info.'ENDCI--->'.$output;

			for ($written = 0, $length = strlen($output); $written < $length; $written += $result)
			{
				if (($result = fwrite($fp, substr($output, $written))) === FALSE)
				{
					break;
				}
			}

			flock($fp, LOCK_UN);
		}
		else
		{
			log_message('error', 'Unable to secure a file lock for file at: '.$cache_path);
			return;
		}

		fclose($fp);

		if (is_int($result))
		{
			chmod($cache_path, 0640);
			log_message('debug', 'Cache file written: '.$cache_path);

			// Send HTTP cache-control headers to browser to match file cache settings.
			$this->set_cache_header($_SERVER['REQUEST_TIME'], $expire);
		}
		else
		{
			@unlink($cache_path);
			log_message('error', 'Unable to write the complete cache content at: '.$cache_path);
		}
	}

	// --------------------------------------------------------------------

	/**
	 * Update/serve cached output
	 *
	 * @uses	CI_Config
	 * @uses	CI_URI
	 *
	 * @param	object	&$CFG	CI_Config class instance
	 * @param	object	&$URI	CI_URI class instance
	 * @return	bool	TRUE on success or FALSE on failure
	 */
	public function _display_cache(&$CFG, &$URI)
	{
		$cache_path = ($CFG->item('cache_path') === '') ? APPPATH.'cache/' : $CFG->item('cache_path');

		// Build the file path. The file name is an MD5 hash of the full URI
		$uri = $CFG->item('base_url').$CFG->item('index_page').$URI->uri_string;

		if (($cache_query_string = $CFG->item('cache_query_string')) && ! empty($_SERVER['QUERY_STRING']))
		{
			if (is_array($cache_query_string))
			{
				$uri .= '?'.http_build_query(array_intersect_key($_GET, array_flip($cache_query_string)));
			}
			else
			{
				$uri .= '?'.$_SERVER['QUERY_STRING'];
			}
		}

		$filepath = $cache_path.md5($uri);

		if ( ! file_exists($filepath) OR ! $fp = @fopen($filepath, 'rb'))
		{
			return FALSE;
		}

		flock($fp, LOCK_SH);

		$cache = (filesize($filepath) > 0) ? fread($fp, filesize($filepath)) : '';

		flock($fp, LOCK_UN);
		fclose($fp);

		// Look for embedded serialized file info.
		if ( ! preg_match('/^(.*)ENDCI--->/', $cache, $match))
		{
			return FALSE;
		}

		$cache_info = unserialize($match[1]);
		$expire = $cache_info['expire'];

		$last_modified = filemtime($filepath);

		// Has the file expired?
		if ($_SERVER['REQUEST_TIME'] >= $expire && is_really_writable($cache_path))
		{
			// If so we'll delete it.
			@unlink($filepath);
			log_message('debug', 'Cache file has expired. File deleted.');
			return FALSE;
		}
		else
		{
			// Or else send the HTTP cache control headers.
			$this->set_cache_header($last_modified, $expire);
		}

		// Add headers from cache file.
		foreach ($cache_info['headers'] as $header)
		{
			$this->set_header($header[0], $header[1]);
		}

		// Display the cache
		$this->_display(substr($cache, strlen($match[0])));
		log_message('debug', 'Cache file is current. Sending it to browser.');
		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Delete cache
	 *
	 * @param	string	$uri	URI string
	 * @return	bool
	 */
	public function delete_cache($uri = '')
	{
		$CI =& get_instance();
		$cache_path = $CI->config->item('cache_path');
		if ($cache_path === '')
		{
			$cache_path = APPPATH.'cache/';
		}

		if ( ! is_dir($cache_path))
		{
			log_message('error', 'Unable to find cache path: '.$cache_path);
			return FALSE;
		}

		if (empty($uri))
		{
			$uri = $CI->uri->uri_string();

			if (($cache_query_string = $CI->config->item('cache_query_string')) && ! empty($_SERVER['QUERY_STRING']))
			{
				if (is_array($cache_query_string))
				{
					$uri .= '?'.http_build_query(array_intersect_key($_GET, array_flip($cache_query_string)));
				}
				else
				{
					$uri .= '?'.$_SERVER['QUERY_STRING'];
				}
			}
		}

		$cache_path .= md5($CI->config->item('base_url').$CI->config->item('index_page').ltrim($uri, '/'));

		if ( ! @unlink($cache_path))
		{
			log_message('error', 'Unable to delete cache file for '.$uri);
			return FALSE;
		}

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Set Cache Header
	 *
	 * Set the HTTP headers to match the server-side file cache settings
	 * in order to reduce bandwidth.
	 *
	 * @param	int	$last_modified	Timestamp of when the page was last modified
	 * @param	int	$expiration	Timestamp of when should the requested page expire from cache
	 * @return	void
	 */
	public function set_cache_header($last_modified, $expiration)
	{
		$max_age = $expiration - $_SERVER['REQUEST_TIME'];

		if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && $last_modified <= strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']))
		{
			$this->set_status_header(304);
			exit;
		}
		else
		{
			header('Pragma: public');
			header('Cache-Control: max-age='.$max_age.', public');
			header('Expires: '.gmdate('D, d M Y H:i:s', $expiration).' GMT');
			header('Last-modified: '.gmdate('D, d M Y H:i:s', $last_modified).' GMT');
		}
	}

}