[源码]文件下载类

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<?    
//====================================================  
//   使用范例：    
// $download=new download('php,exe,html',false);    
//  if(!$download->downloadfile($filename))    
//  {    
//    echo $download->geterrormsg();    
//  }          
//====================================================  
class download{    
  var $debug=true;    
  var $errormsg='';    
  var $Filter=array();    
  var $filename='';    
  var $mineType='text/plain';    
  var $xlq_filetype=array();    
 
  function download($fileFilter='',$isdebug=true)    
  {    
    $this->setFilter($fileFilter);    
        $this->setdebug($isdebug);            
        $this->setfiletype();    
  }    
 
  function setFilter($fileFilter)    
  {    
    if(empty($fileFilter)) return ;    
        $this->Filter=explode(',',strtolower($fileFilter));    
  }    
  function setdebug($debug)    
  {    
    $this->debug=$debug;    
  }    
 
  function setfilename($filename)    
  {    
    $this->filename=$filename;    
  }    
 
  function downloadfile($filename)    
  {    
    $this->setfilename($filename);    
    if($this->filecheck())    
        {    
          $fn = array_pop( explode( '/', strtr( $this->filename, '\\', '/' ) ) );    
          header( "Pragma: public" );    
      header( "Expires: 0" ); // set expiration time    
      header( "Cache-Component: must-revalidate, post-check=0, pre-check=0" );    
          header( "Content-type:".$this->mineType );    
      header( "Content-Length: " . filesize( $this->filename ) );    
      header( "Content-Disposition: attachment; filename="$fn"" );    
      header( 'Content-Transfer-Encoding: binary' );    
      readfile( $this->filename );    
      return true;    
        }else    
        {    
        return false;    
        }    
  }    
  function geterrormsg()    
  {    
    return $this->errormsg;    
  }    
 
  function filecheck()    
  {    
    $filename=$this->filename;    
        if(file_exists($filename))    
        {    
           $filetype=strtolower(array_pop(explode('.',$filename)));  
           if(in_array($filetype,$this->Filter))    
           {    
             $this->errormsg.=$filename.'不允许下载！';    
                 if($this->debug) exit($filename.'不允许下载！') ;    
                 return false;    
           }else    
           {    
             if ( function\_exists( "mime\_content_type" ) )    
                 {    
           $this->mineType = mime\_content\_type( $filename );    
         }    
                 if(empty($this->mineType))    
                 {    
                    if( isset($this->xlq\_filetype\[$filetype\]) )  $this->mineType = $this->xlq\_filetype\[$filetype\];    
                 }    
                 if(!empty($this->mineType))    
                   return true;    
                 else    
                 {    
                    $this->errormsg.='获取'.$filename.'文件类型时候发生错误，或者不存在预定文件类型内';    
                        if($this->debug) exit('获取文件类型出错');    
                        return false;    
                 }    
           }    
        }else    
        {    
          $this->errormsg.=$filename.'不存在!';    
          if($this->debug) exit($filename.'不存在!') ;    
          return false;    
        }    
  }    
 
  function setfiletype()    
  {    
    $this->xlq_filetype\['chm'\]='application/octet-stream';    
    $this->xlq_filetype\['ppt'\]='application/vnd.ms-powerpoint';    
    $this->xlq_filetype\['xls'\]='application/vnd.ms-excel';    
    $this->xlq_filetype\['doc'\]='application/msword';    
    $this->xlq_filetype\['exe'\]='application/octet-stream';    
    $this->xlq_filetype\['rar'\]='application/octet-stream';    
    $this->xlq_filetype\['js'\]="javascript/js";    
    $this->xlq_filetype\['css'\]="text/css";    
    $this->xlq_filetype\['hqx'\]="application/mac-binhex40";    
    $this->xlq_filetype\['bin'\]="application/octet-stream";    
    $this->xlq_filetype\['oda'\]="application/oda";    
    $this->xlq_filetype\['pdf'\]="application/pdf";    
    $this->xlq_filetype\['ai'\]="application/postsrcipt";    
    $this->xlq_filetype\['eps'\]="application/postsrcipt";    
    $this->xlq_filetype\['es'\]="application/postsrcipt";    
    $this->xlq_filetype\['rtf'\]="application/rtf";    
    $this->xlq_filetype\['mif'\]="application/x-mif";    
    $this->xlq_filetype\['csh'\]="application/x-csh";    
    $this->xlq_filetype\['dvi'\]="application/x-dvi";    
    $this->xlq_filetype\['hdf'\]="application/x-hdf";    
    $this->xlq_filetype\['nc'\]="application/x-netcdf";    
    $this->xlq_filetype\['cdf'\]="application/x-netcdf";    
    $this->xlq_filetype\['latex'\]="application/x-latex";    
    $this->xlq_filetype\['ts'\]="application/x-troll-ts";    
    $this->xlq_filetype\['src'\]="application/x-wais-source";    
    $this->xlq_filetype\['zip'\]="application/zip";    
    $this->xlq_filetype\['bcpio'\]="application/x-bcpio";    
    $this->xlq_filetype\['cpio'\]="application/x-cpio";    
    $this->xlq_filetype\['gtar'\]="application/x-gtar";    
    $this->xlq_filetype\['shar'\]="application/x-shar";    
    $this->xlq_filetype\['sv4cpio'\]="application/x-sv4cpio";    
    $this->xlq_filetype\['sv4crc'\]="application/x-sv4crc";    
    $this->xlq_filetype\['tar'\]="application/x-tar";    
    $this->xlq_filetype\['ustar'\]="application/x-ustar";    
    $this->xlq_filetype\['man'\]="application/x-troff-man";    
    $this->xlq_filetype\['sh'\]="application/x-sh";    
    $this->xlq_filetype\['tcl'\]="application/x-tcl";    
    $this->xlq_filetype\['tex'\]="application/x-tex";    
    $this->xlq_filetype\['texi'\]="application/x-texinfo";    
    $this->xlq_filetype\['texinfo'\]="application/x-texinfo";    
    $this->xlq_filetype\['t'\]="application/x-troff";    
    $this->xlq_filetype\['tr'\]="application/x-troff";    
    $this->xlq_filetype\['roff'\]="application/x-troff";    
    $this->xlq_filetype\['shar'\]="application/x-shar";    
    $this->xlq_filetype\['me'\]="application/x-troll-me";    
    $this->xlq_filetype\['ts'\]="application/x-troll-ts";    
    $this->xlq_filetype\['gif'\]="image/gif";    
    $this->xlq_filetype\['jpeg'\]="image/pjpeg";    
    $this->xlq_filetype\['jpg'\]="image/pjpeg";    
    $this->xlq_filetype\['jpe'\]="image/pjpeg";    
    $this->xlq_filetype\['ras'\]="image/x-cmu-raster";    
    $this->xlq_filetype\['pbm'\]="image/x-portable-bitmap";    
    $this->xlq_filetype\['ppm'\]="image/x-portable-pixmap";    
    $this->xlq_filetype\['xbm'\]="image/x-xbitmap";    
    $this->xlq_filetype\['xwd'\]="image/x-xwindowdump";    
    $this->xlq_filetype\['ief'\]="image/ief";    
    $this->xlq_filetype\['tif'\]="image/tiff";    
    $this->xlq_filetype\['tiff'\]="image/tiff";    
    $this->xlq_filetype\['pnm'\]="image/x-portable-anymap";    
    $this->xlq_filetype\['pgm'\]="image/x-portable-graymap";    
    $this->xlq_filetype\['rgb'\]="image/x-rgb";    
    $this->xlq_filetype\['xpm'\]="image/x-xpixmap";    
    $this->xlq_filetype\['txt'\]="text/plain";    
    $this->xlq_filetype\['c'\]="text/plain";    
    $this->xlq_filetype\['cc'\]="text/plain";    
    $this->xlq_filetype\['h'\]="text/plain";    
    $this->xlq_filetype\['html'\]="text/html";    
    $this->xlq_filetype\['htm'\]="text/html";    
    $this->xlq_filetype\['htl'\]="text/html";    
    $this->xlq_filetype\['rtx'\]="text/richtext";    
    $this->xlq_filetype\['etx'\]="text/x-setext";    
    $this->xlq_filetype\['tsv'\]="text/tab-separated-values";  
    $this->xlq_filetype\['mpeg'\]="video/mpeg";    
    $this->xlq_filetype\['mpg'\]="video/mpeg";    
    $this->xlq_filetype\['mpe'\]="video/mpeg";    
    $this->xlq_filetype\['avi'\]="video/x-msvideo";    
    $this->xlq_filetype\['qt'\]="video/quicktime";    
    $this->xlq_filetype\['mov'\]="video/quicktime";    
    $this->xlq_filetype\['moov'\]="video/quicktime";    
    $this->xlq_filetype\['movie'\]="video/x-sgi-movie";    
    $this->xlq_filetype\['au'\]="audio/basic";    
    $this->xlq_filetype\['snd'\]="audio/basic";    
    $this->xlq_filetype\['wav'\]="audio/x-wav";    
    $this->xlq_filetype\['aif'\]="audio/x-aiff";    
    $this->xlq_filetype\['aiff'\]="audio/x-aiff";    
    $this->xlq_filetype\['aifc'\]="audio/x-aiff";    
    $this->xlq_filetype\['swf'\]="application/x-shockwave-flash";    
  }    
}    
?>
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