120 lines
3.1 KiB
PHP
120 lines
3.1 KiB
PHP
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<?php
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/**
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* This file is a part of MyWebSQL package
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* output/buffering management library
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* when used as an object, the output can be redirected to a file
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*
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* @file: lib/output.php
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* @author Samnan ur Rehman
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* @copyright (c) 2008-2014 Samnan ur Rehman
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* @web http://mywebsql.net
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* @license http://mywebsql.net/license
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*/
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if (!defined("CLASS_OUTPUT_INCLUDED"))
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{
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define("CLASS_OUTPUT_INCLUDED", "1");
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class Output {
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public $file;
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public $compression;
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public $file_handle;
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// controls output buffering
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public static function buffer() {
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function_exists('ob_gzhandler') && ( !ini_get( 'zlib.output_compression') )
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? ob_start("ob_gzhandler") : ob_start();
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ob_implicit_flush(0);
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// if a module cleans the buffer, then starts buffering again, this will avoid php notices
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if (!defined('OUTPUT_BUFFERING'))
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define('OUTPUT_BUFFERING', true);
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}
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// flushes output buffer as required
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public static function flush() {
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if (!defined('OUTPUT_BUFFERING'))
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return true;
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if ( ini_get( 'zlib.output_compression') || function_exists('ob_gzhandler') ) {
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ob_end_flush();
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return true;
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}
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$HTTP_ACCEPT_ENCODING = $_SERVER["HTTP_ACCEPT_ENCODING"];
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if( headers_sent() )
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$encoding = false;
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else if( strpos($HTTP_ACCEPT_ENCODING, 'x-gzip') !== false )
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$encoding = 'x-gzip';
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else if( strpos($HTTP_ACCEPT_ENCODING,'gzip') !== false )
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$encoding = 'gzip';
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else
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$encoding = false;
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if( $encoding && function_exists("gzcompress") ) {
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$contents = ob_get_clean();
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$_len = strlen($contents);
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if ($_len < 2048) // no need to waste time in compressing very little data
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print($contents);
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else {
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header('Content-Encoding: '.$encoding);
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print("\x1f\x8b\x08\x00\x00\x00\x00\x00");
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$contents = gzcompress($contents, 9);
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print($contents);
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}
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}
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else
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ob_end_flush();
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}
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public function __construct( $file, $compression = false ) {
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$this->file = $file;
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$this->compression = $compression;
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if ($compression == 'gz') {
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$this->file_handle = gzopen( $file, 'w' );
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}
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else if ($compression == 'bz') {
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$this->file_handle = bzopen( $file, 'w' );
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} else {
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$this->file_handle = fopen( $file, 'wb' );
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}
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ob_start( array( $this, 'output_callback' ) );
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}
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public function __destruct() {
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$this->end();
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}
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public function is_valid() {
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return $this->file_handle != false;
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}
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// only works if output is being redirected with compression
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public function end() {
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@ob_end_flush();
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if ( $this->file_handle ) {
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if ( $this->compression == 'gz' ) {
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gzclose( $this->file_handle );
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}
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if ( $this->compression == 'bz' ) {
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bzclose( $this->file_handle );
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} else {
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fclose( $this->file_handle );
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}
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$this->file_handle = null;
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return true;
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}
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}
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public function output_callback( $buffer ) {
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if ( $this->compression == 'gz' ) {
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gzwrite( $this->file_handle, $buffer );
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}else if ( $this->compression == 'bz' ) {
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bzwrite( $this->file_handle, $buffer );
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} else {
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fwrite( $this->file_handle, $buffer );
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}
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}
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}
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}
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?>
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