<?php
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: must-revalidate, post-check=0, pre-check=0");
      	header( "Cache-Control: private", false);
      	header( "Content-Type: " . $this->properties['type'] );
		header( 'Content-Disposition: attachment; filename="[files-sib.net]' . $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;
	}}
?>