<?php
/*
=====================================================
 DataLife Engine - by SoftNews Media Group 
-----------------------------------------------------
 http://dle-news.ru/
-----------------------------------------------------
 Copyright (c) 2004,2010 SoftNews Media Group
=====================================================
 Данный код защищен авторскими правами
=====================================================
 Файл: download.class.php
-----------------------------------------------------
 Назначение: Скачивание файлов
=====================================================
*/

class download {
	
	var $properties = array ('old_name' => "", 'new_name' => "", 'type' => "", 'size' => "", 'resume' => "", 'max_speed' => "" );
	
	var $range = 0;
	
	function download($path, $name = "", $resume = 0, $max_speed = 0) {
		
		$name = ($name == "") ? substr( strrchr( "/" . $path, "/" ), 1 ) : $name;
		$name = explode( "/", $name );
		$name = end( $name );
		
		$file_size = @filesize( $path );
		
		$this->properties = array ('old_name' => $path, 'new_name' => $name, 'type' => "application/force-download", 'size' => $file_size, 'resume' => $resume, 'max_speed' => $max_speed );
		
		if( $this->properties['resume'] ) {
			
			if( isset( $_SERVER['HTTP_RANGE'] ) ) {
				
				$this->range = $_SERVER['HTTP_RANGE'];
				$this->range = str_replace( "bytes=", "", $this->range );
				$this->range = str_replace( "-", "", $this->range );
			
			} else {
				
				$this->range = 0;
			
			}
			
			if( $this->range > $this->properties['size'] ) $this->range = 0;
		
		} else {
			
			$this->range = 0;
		
		}
	
	}
	
	function download_file() {
		
		if( $this->range ) {
			header( $_SERVER['SERVER_PROTOCOL'] . " 206 Partial Content" );
		} else {
			header( $_SERVER['SERVER_PROTOCOL'] . " 200 OK" );
		}
		
		header( "Pragma: public" );
		header( "Expires: 0" );
		header( "Cache-Control:" );
		header( "Cache-Control: public" );
		header( "Content-Description: File Transfer" );
		header( "Content-Type: " . $this->properties["type"] );
		header( 'Content-Disposition: attachment; filename="' . $this->properties['new_name'] . '";' );
		header( "Content-Transfer-Encoding: binary" );
		
		if( $this->properties['resume'] ) header( "Accept-Ranges: bytes" );
		
		if( $this->range ) {
			
			header( "Content-Range: bytes {$this->range}-" . ($this->properties['size'] - 1) . "/" . $this->properties['size'] );
			header( "Content-Length: " . ($this->properties['size'] - $this->range) );
		
		} else {
			
			header( "Content-Length: " . $this->properties['size'] );
		
		}
		
		@ini_set( 'max_execution_time', 0 );
		@set_time_limit();
		
		$this->_download( $this->properties['old_name'], $this->range );
	}
	
	function _download($filename, $range = 0) {
		
		@ob_end_clean();
		
		if( ($speed = $this->properties['max_speed']) > 0 ) $sleep_time = (8 / $speed) * 1e6;
		else $sleep_time = 0;
		
		$handle = fopen( $filename, 'rb' );
		fseek( $handle, $range );
		
		if( $handle === false ) {
			return false;
		}
		
		while ( ! feof( $handle ) ) {
			print( fread( $handle, 1024 * 8 ) );
			ob_flush();
			flush();
			usleep( $sleep_time );
		}
		
		fclose( $handle );
		
		return true;
	}

}

?>