mirror of
https://github.com/DzzXH/DzzOffice.git
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103 lines
2.8 KiB
PHP
103 lines
2.8 KiB
PHP
<?php
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/** php下载类,支持断点续传
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* Date: 2013-06-30
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* Author: test
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* Ver: 1.0
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*
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* Func:
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* download: 下载文件
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* setSpeed: 设置下载速度
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* getRange: 获取header中Range
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*/
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class FileDownload{ // class start
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private $_speed = 512; // 下载速度
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/** 下载
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* @param String $file 要下载的文件路径
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* @param String $name 文件名称,为空则与下载的文件名称一样
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* @param boolean $reload 是否开启断点续传
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*/
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public function download($file, $name='',$file_size=0,$dateline=0, $reload=false){
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if($name==''){
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$name = basename($file);
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}
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if(!$dateline){
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$dataline=TIMESTAMP;
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}
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if(!$fp = fopen($file, 'rb')){
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topshowmessage(lang('file_not_exist1'));
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}
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$db = DB::object();
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$db->close();
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@ob_end_clean();
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if(getglobal('gzipcompress')) @ob_start('ob_gzhandler');
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if(!$file_size) $file_size = filesize($file);
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$ranges = $this->getRange($file_size);
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header('cache-control:public');
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header('Date: '.gmdate('D, d M Y H:i:s', $dateline).' GMT');
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header('Last-Modified: '.gmdate('D, d M Y H:i:s', $dateline).' GMT');
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header('content-type:application/octet-stream');
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header('content-disposition:attachment; filename='.$name);
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if($reload && $ranges!=null){ // 使用续传
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header('HTTP/1.1 206 Partial Content');
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header('Accept-Ranges:bytes');
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// 剩余长度
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header(sprintf('content-length:%u',$ranges['end']-$ranges['start']+1));
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// range信息
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header(sprintf('content-range:bytes %s-%s/%s', $ranges['start'], $ranges['end'], $file_size));
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// fp指针跳到断点位置
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fseek($fp, sprintf('%u', $ranges['start']));
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}else{
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header('HTTP/1.1 200 OK');
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header('content-length:'.$file_size);
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}
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while(!feof($fp)){
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echo fread($fp, round($this->_speed*1024,0));
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@flush(); @ob_flush();
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// usleep(500); // 用于测试,减慢下载速度
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}
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($fp!=null) && fclose($fp);
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}
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/** 设置下载速度
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* @param int $speed
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*/
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public function setSpeed($speed){
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if(is_numeric($speed) && $speed>16 && $speed<4096){
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$this->_speed = $speed;
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}
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}
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/** 获取header range信息
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* @param int $file_size 文件大小
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* @return Array
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*/
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private function getRange($file_size){
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if(isset($_SERVER['HTTP_RANGE'])){
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list($a, $range) = explode("=",$_SERVER['HTTP_RANGE'],2);
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list($range) = explode(",",$range,2);
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list($start, $range_end) = explode("-", $range);
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$start=intval($start);
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if(!$range_end) {
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$range_end=$file_size-1;
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} else {
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$range_end=intval($range_end);
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}
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$range = array('start'=>$start,'end'=>$range_end);
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return $range;
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}
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return null;
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}
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} // class end
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?>
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