Bandwidth question

[Nightcracker]

Hi all, my first post! I have a script that create's a zip file on the fly. Why? Because it contains something I want to publish, an installer and a config file for the installer. The content and the installer are static, but the config file is dynamic. With the script I can "compile" a zip file and send it to the client without saving it on the server. The static content is about 60MB and will be saved on a mirror, and the dynamic content will be generated and about 1KB. My question is, since with this script I only hand trough the static files from a mirror while in the process zipping it, will this take the full 60MB of bandwidth? Or just the static content part? This is the script that add's the custom content to the zip file(the part on the bottom is just an example):

 

<?php  
/* 
Zip file creation class 
makes zip files on the fly... 

use the functions add_dir() and add_file() to build the zip file; 
see example code below 

by Eric Mueller 
http://www.themepark.com 

v1.1 9-20-01 
 - added comments to example 

v1.0 2-5-01 

initial version with: 
 - class appearance 
 - add_file() and file() methods 
 - gzcompress() output hacking 
by Denis O.Philippov, webmaster@atlant.ru, http://www.atlant.ru 

*/  

// official ZIP file format: http://www.pkware.com/appnote.txt 

class zipfile   
{   

   var $datasec = array(); // array to store compressed data 
   var $ctrl_dir = array(); // central directory    
   var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00"; //end of Central directory record 
   var $old_offset = 0;  

   function add_dir($name)    

   // adds "directory" to archive - do this before putting any files in directory! 
   // $name - name of directory... like this: "path/" 
   // ...then you can add files using add_file with names like "path/file.txt" 
   {   
       $name = str_replace("\\", "/", $name);   

       $fr = "\x50\x4b\x03\x04";  
       $fr .= "\x0a\x00";    // ver needed to extract 
       $fr .= "\x00\x00";    // gen purpose bit flag 
       $fr .= "\x00\x00";    // compression method 
       $fr .= "\x00\x00\x00\x00"; // last mod time and date 

       $fr .= pack("V",0); // crc32 
       $fr .= pack("V",0); //compressed filesize 
       $fr .= pack("V",0); //uncompressed filesize 
       $fr .= pack("v", strlen($name) ); //length of pathname 
       $fr .= pack("v", 0 ); //extra field length 
       $fr .= $name;   
       // end of "local file header" segment 

       // no "file data" segment for path 

       // "data descriptor" segment (optional but necessary if archive is not served as file) 
       $fr .= pack("V",$crc); //crc32 
       $fr .= pack("V",$c_len); //compressed filesize 
       $fr .= pack("V",$unc_len); //uncompressed filesize 

       // add this entry to array 
       $this -> datasec[] = $fr;  

       $new_offset = strlen(implode("", $this->datasec));  

       // ext. file attributes mirrors MS-DOS directory attr byte, detailed 
       // at http://support.microsoft.com/support/kb/ar...s/Q125/0/19.asp 

       // now add to central record 
       $cdrec = "\x50\x4b\x01\x02";  
       $cdrec .="\x00\x00";    // version made by 
       $cdrec .="\x0a\x00";    // version needed to extract 
       $cdrec .="\x00\x00";    // gen purpose bit flag 
       $cdrec .="\x00\x00";    // compression method 
       $cdrec .="\x00\x00\x00\x00"; // last mod time & date 
       $cdrec .= pack("V",0); // crc32 
       $cdrec .= pack("V",0); //compressed filesize 
       $cdrec .= pack("V",0); //uncompressed filesize 
       $cdrec .= pack("v", strlen($name) ); //length of filename 
       $cdrec .= pack("v", 0 ); //extra field length    
       $cdrec .= pack("v", 0 ); //file comment length 
       $cdrec .= pack("v", 0 ); //disk number start 
       $cdrec .= pack("v", 0 ); //internal file attributes 
       $ext = "\x00\x00\x10\x00";  
       $ext = "\xff\xff\xff\xff";   
       $cdrec .= pack("V", 16 ); //external file attributes  - 'directory' bit set 

       $cdrec .= pack("V", $this -> old_offset ); //relative offset of local header 
       $this -> old_offset = $new_offset;  

       $cdrec .= $name;   
       // optional extra field, file comment goes here 
       // save to array 
       $this -> ctrl_dir[] = $cdrec;   

         
   }  


   function add_file($data, $name)    

   // adds "file" to archive    
   // $data - file contents 
   // $name - name of file in archive. Add path if your want 

   {   
       $name = str_replace("\\", "/", $name);   
       //$name = str_replace("\\", "\\\\", $name); 

       $fr = "\x50\x4b\x03\x04";  
       $fr .= "\x14\x00";    // ver needed to extract 
       $fr .= "\x00\x00";    // gen purpose bit flag 
       $fr .= "\x08\x00";    // compression method 
       $fr .= "\x00\x00\x00\x00"; // last mod time and date 

       $unc_len = strlen($data);   
       $crc = crc32($data);   
       $zdata = gzcompress($data);   
       $zdata = substr( substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug 
       $c_len = strlen($zdata);   
       $fr .= pack("V",$crc); // crc32 
       $fr .= pack("V",$c_len); //compressed filesize 
       $fr .= pack("V",$unc_len); //uncompressed filesize 
       $fr .= pack("v", strlen($name) ); //length of filename 
       $fr .= pack("v", 0 ); //extra field length 
       $fr .= $name;   
       // end of "local file header" segment 
         
       // "file data" segment 
       $fr .= $zdata;   

       // "data descriptor" segment (optional but necessary if archive is not served as file) 
       $fr .= pack("V",$crc); //crc32 
       $fr .= pack("V",$c_len); //compressed filesize 
       $fr .= pack("V",$unc_len); //uncompressed filesize 

       // add this entry to array 
       $this -> datasec[] = $fr;  

       $new_offset = strlen(implode("", $this->datasec));  

       // now add to central directory record 
       $cdrec = "\x50\x4b\x01\x02";  
       $cdrec .="\x00\x00";    // version made by 
       $cdrec .="\x14\x00";    // version needed to extract 
       $cdrec .="\x00\x00";    // gen purpose bit flag 
       $cdrec .="\x08\x00";    // compression method 
       $cdrec .="\x00\x00\x00\x00"; // last mod time & date 
       $cdrec .= pack("V",$crc); // crc32 
       $cdrec .= pack("V",$c_len); //compressed filesize 
       $cdrec .= pack("V",$unc_len); //uncompressed filesize 
       $cdrec .= pack("v", strlen($name) ); //length of filename 
       $cdrec .= pack("v", 0 ); //extra field length    
       $cdrec .= pack("v", 0 ); //file comment length 
       $cdrec .= pack("v", 0 ); //disk number start 
       $cdrec .= pack("v", 0 ); //internal file attributes 
       $cdrec .= pack("V", 32 ); //external file attributes - 'archive' bit set 

       $cdrec .= pack("V", $this -> old_offset ); //relative offset of local header 
//        echo "old offset is ".$this->old_offset.", new offset is $new_offset<br>"; 
       $this -> old_offset = $new_offset;  

       $cdrec .= $name;   
       // optional extra field, file comment goes here 
       // save to central directory 
       $this -> ctrl_dir[] = $cdrec;   
   }  

   function file() { // dump out file    
       $data = implode("", $this -> datasec);   
       $ctrldir = implode("", $this -> ctrl_dir);   

       return    
           $data.   
           $ctrldir.   
           $this -> eof_ctrl_dir.   
           pack("v", sizeof($this -> ctrl_dir)).     // total # of entries "on this disk" 
           pack("v", sizeof($this -> ctrl_dir)).     // total # of entries overall 
           pack("V", strlen($ctrldir)).             // size of central dir 
           pack("V", strlen($data)).                 // offset to start of central dir 
           "\x00\x00";                             // .zip file comment length 
   }  
}   

       $zipfile = new zipfile();
       $zipfile->add_dir("testdir/");
       $zipfile->add_file("http://www.somewheremirrorupload.com/uploads/somebigfile.txt","testdir/test.txt");
       header("Content-type: application/octet-stream");
       header("Content-disposition: attachment; filename=publishment.zip");
       echo $zipfile->file();
?>

Thanks in advance!

[Ashoat]

If the file is being downloaded from a HelioHost URL, then the bandwidth is going to count. As long as the information is going through our wires we have to pay for it.

[Nightcracker]

If the file is being downloaded from a HelioHost URL, then the bandwidth is going to count. As long as the information is going through our wires we have to pay for it.

 

[bleeped!], now I'll have to find a way around it, thanks anyway!