php unzipping huge files

Question

I'm trying to unzip a huge file (400+M compressed well over 4G unzipped) using php zip archive. I'm only unzipping one csv file in the zipped file.. the file I am interested in, unzipped, is over 4G.. I get as far as 3 records from the end of the file and the process takes off into lala land.. I mean the process simply goes on.. no output.. no errors no looping it just goes on... I haven't a clue as to what its doing.. my code is simple:

$zip = new ZipArchive;
$res = $zip->open($file);
if ($res === TRUE) 
{
   $num = $zip->numFiles;
   for($i = 0; $i < $zip->numFiles; $i++) 
   {
      $filename = $zip->getNameIndex($i);
  // if its the file I want then...
      $content = '';
  // my output file  .. yes I've already checked to make sure the dir exists
      $unzipped = fopen($dir ."/2" . $filename  , 'wb');         
      $fp = $zip->getStream($filename);
      if(!$fp) exit("failed\n");
      while (!feof($fp))
      {
    $chunkSize = 10240;
    $contents = fread($fp, $chunkSize);
        $fwrite = fwrite($unzipped, $contents);
      }
      fclose($fp);
      fclose($unzipped);
    }

    $zip->close();
    fclose($filename);

}  

I've removed the write statements that go to another file to track progress. I get most of the file out.. (as I said 3 records short of the entire file)... but the process seems to go off somewhere.. it gets happens on the fread I just can't figure out what is happening.. It hasn't reached the eof.. the source is intact (checked with is_source($fp) just before the fread.. it throws no errors.. closing the browser doesn't stop it.. can't even stop apache.. have to shut down to end it...

any ideas??

thanks

Answer 1

sounds like a bug to be honest(in php).

you might want to try outputting calls to memory_get_usage() to help you debug. But, also, see stream_copy_to_stream() because you can get rid of all that looping cruft. It might also be intresteting to keep a running total of bytes written to see if the number where things go awry look suspicious.