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<?php
/*
* phpGACL - Generic Access Control List - Hashed Directory Caching.
* Copyright (C) 2002 Mike Benoit
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* For questions, help, comments, discussion, etc., please join the
* phpGACL mailing list. http://sourceforge.net/mail/?group_id=57103
*
* You may contact the author of phpGACL by e-mail at:
* ipso@snappymail.ca
*
* The latest version of phpGACL can be obtained from:
* http://phpgacl.sourceforge.net/
*
*/
if ( !class_exists('Cache_Lite') ) {
require_once(dirname(__FILE__) .'/Lite.php');
}
define('DIR_SEP',DIRECTORY_SEPARATOR);
class Hashed_Cache_Lite extends Cache_Lite
{
/**
* Make a file name (with path)
*
* @param string $id cache id
* @param string $group name of the group
* @access private
*/
function _setFileName($id, $group)
{
// CRC32 with SUBSTR is still faster then MD5.
$encoded_id = substr(crc32($id),1);
// $encoded_id = md5($id);
// Generate just the directory, so it can be created.
// Groups will have their own top level directory, for quick/easy purging of an entire group.
$dir = $this->_cacheDir.$group.'/'.substr($encoded_id,0,3);
$this->_create_dir_structure($dir);
$this->_file = $dir.'/'.$encoded_id;
}
/**
* Create full directory structure, Ripped straight from the Smarty Template engine.
* Version: 2.3.0
* Copyright: 2001,2002 ispi of Lincoln, Inc.
*
* @param string $dir Full directory.
* @access private
*/
function _create_dir_structure($dir)
{
if (!@file_exists($dir)) {
$dir_parts = preg_split('![\/]+!', $dir, -1, PREG_SPLIT_NO_EMPTY);
$new_dir = ($dir{0} == DIR_SEP) ? DIR_SEP : '';
foreach ($dir_parts as $dir_part) {
$new_dir .= $dir_part;
if (!file_exists($new_dir) && !mkdir($new_dir, 0771)) {
Cache_Lite::raiseError('Cache_Lite : problem creating directory \"$dir\" !', -3);
return false;
}
$new_dir .= DIR_SEP;
}
}
}
function _remove_dir_structure($dir,$remove_dir = false)
{
if (in_array(substr($dir,-1),array(DIR_SEP,'/','\\'))) {
$dir = substr($dir,0,-1);
}
if (!($dh = opendir($dir))) {
$this->raiseError('Cache_Lite : Unable to open cache directory !', -4);
return false;
}
while ($file = readdir($dh)) {
if ($file == '.' || $file == '..') {
continue;
}
$file = $dir . DIR_SEP . $file;
if (is_dir($file)) {
$this->_remove_dir_structure($file,true);
continue;
}
if (is_file($file)) {
if (!@unlink($file)) {
closedir($dh);
$this->raiseError('Cache_Lite : Unable to remove cache !', -3);
return false;
}
continue;
}
}
closedir($dh);
if ($remove_dir) {
clearstatcache();
if (!@rmdir($dir)) {
$this->raiseError('Cache_Lite : Unable to remove cache directory !', -4);
return false;
}
}
return true;
}
/**
* Clean the cache
*
* if no group is specified all cache files will be destroyed
* else only cache files of the specified group will be destroyed
*
* @param string $group name of the cache group
* @return boolean true if no problem
* @access public
*/
function clean($group = false)
{
if ($group) {
$motif = $this->_cacheDir.$group.'/';
if ($this->_memoryCaching) {
foreach ($this->_memoryCachingArray as $key => $value) {
if (strpos($key, $motif, 0)) {
unset($this->_memoryCachingArray[$key]);
}
}
$this->_memoryCachingCounter = count($this->_memoryCachingArray);
if ($this->_onlyMemoryCaching) {
return true;
}
}
return $this->_remove_dir_structure($motif);
}
if ($this->_memoryCaching) {
$this->_memoryCachingArray = array();
$this->_memoryCachingCounter = 0;
if ($this->_onlyMemoryCaching) {
return true;
}
}
if (!($dh = opendir($this->_cacheDir))) {
$this->raiseError('Cache_Lite : Unable to open cache directory !', -4);
return false;
}
while ($file = readdir($dh)) {
if ($file == '.' || $file == '..') {
continue;
}
$file = $this->_cacheDir . $file;
if (is_dir($file) && !$this->_remove_dir_structure($file,true)) {
return false;
}
}
return true;
}
}
// end of script
|
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