<?php
/**
* functions_bmz_io.php
* general filesystem access handling
*
* @author  Tim Kroeger (original author)
* @author Andreas Gohr
* @copyright Copyright 2005-2006
* @license http://www.gnu.org/licenses/gpl.txt GNU General Public License V2.0
* @version $Id: functions_bmz_io.php,v 2.0 Rev 8 2010-05-31 23:46:5 DerManoMann Exp $
* Last modified by DerManoMann 2010-05-31 23:46:50 
*/
/**
* Tries to lock a file
*
* Locking uses directories inside $bmzConf['lockdir']
*
* It waits maximal 3 seconds for the lock, after this time
* the lock is assumed to be stale and the function goes on 
*
* @author Andreas Gohr <andi@splitbrain.org>
* @author Tim Kroeger <tim@breakmyzencart.com>
*/
function io_lock($file){
global $bmzConf;
// no locking if safemode hack
//if ($bmzConf['safemodehack']) return;
$lockDir = $bmzConf['lockdir'] . '/' . md5($file);
@ignore_user_abort(1);
$timeStart = time();
do {
//waited longer than 3 seconds? -> stale lock
if ((time() - $timeStart) > 3) break;
$locked = @mkdir($lockDir);
} while ($locked === false);
}
/**
* Unlocks a file
*
* @author Andreas Gohr <andi@splitbrain.org>
* @author Tim Kroeger <tim@breakmyzencart.com>
*/
function io_unlock($file){
global $bmzConf;
// no locking if safemode hack
//if($bmzConf['safemodehack']) return;
$lockDir = $bmzConf['lockdir'] . '/' . md5($file);
@rmdir($lockDir);
@ignore_user_abort(0);
}
/**
* Returns the name of a cachefile from given data
*
* The needed directory is created by this function!
*
* @author Andreas Gohr <andi@splitbrain.org>
* @author Tim Kroeger <tim@breakmyzencart.com>
*
* @param string $data  This data is used to create a unique md5 name
* @param string $ext   This is appended to the filename if given
* @return string       The filename of the cachefile
*/
function getCacheName($data, $ext='') {
  global $bmzConf;

  $md5  = md5($data);
  @preg_match('/\/([^\/]+\.[a-z]+)[^\/]*$/', $data, $match);
  if(!empty($match[1])) {
      $newfilename_arr = explode('.', $match[1]);
      $newfilename = $newfilename_arr[0];
  }
  else
  {
     $newfilename =  $md5;
  }
  $file = $bmzConf['cachedir'] . '/' . $md5{0} . '/' . $newfilename . $ext;
  io_makeFileDir($file);
  return $file;
}
/**
* Create the directory needed for the given file
*
* @author  Andreas Gohr <andi@splitbrain.org>
* @author  Tim Kroeger <tim@breakmyzencart.com>
*/
function io_makeFileDir($file){
global $messageStack;
global $bmzConf;
$dir = dirname($file);
$dmask = $bmzConf['dmask'];
umask($dmask);
if(!is_dir($dir)){
io_mkdir_p($dir) || $messageStack->add("Creating directory $dir failed", "error");
}
umask($bmzConf['umask']); 
}
/**
* Creates a directory hierachy.
*
* @link    http://www.php.net/manual/en/function.mkdir.php
* @author  <saint@corenova.com>
* @author  Andreas Gohr <andi@splitbrain.org>
* @author  Tim Kroeger <tim@breakmyzencart.com>
*/
function io_mkdir_p($target){
global $bmzConf;
if (is_dir($target) || empty($target)) return 1; // best case check first
if (@file_exists($target) && !is_dir($target)) return 0;
//recursion
if (io_mkdir_p(substr($target, 0, strrpos($target, '/')))){
return @mkdir($target, 0755); // crawl back up & create dir tree
}
return 0;
}