<?php
/* (C) 2006 by legolas558
	TarBackup class v0.1.1
	Licensed under GPL
	http://sf.net/projects/phptarbackup

 * This program is free software and open source software; you can redistribute
 * it and/or modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation
 *
 * This program 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 General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA  or visit
 * http://www.gnu.org/licenses/gpl.html
 */

if (!defined('__TBK_DEFAULT_CHUNK')) {
	define('__TBK_DEFAULT_CHUNK', 5 * 1024 * 1024);
}

define('__TBK_FNAME', 0);
define('__TBK_FSIZE', 1);
define('__TBK_ROOT', 2);
define('__TBK_TARNAME', 3);
define('__TBK_TOTAL', 4);
define('__TBK_DONE', 5);

class TarBackupSkel {
var $progress;

function TarBackupSkel(&$var) {
	$this->progress = &$var;
}

function _addFile($fn, $fs) {
	$this->progress[__TBK_FNAME][] = $fn;
	$this->progress[__TBK_FSIZE][] = $fs;
	$this->progress[__TBK_TOTAL] += $fs;
}

function _init($root, $p_tarname) {
	$this->progress = array(__TBK_FNAME => array(), __TBK_FSIZE => array(), __TBK_ROOT => $root, __TBK_TARNAME => $p_tarname, __TBK_DONE => 0, __TBK_TOTAL => 0);
}

function _pclexec($funcname, $args) {
	$er = error_reporting(-1 ^ E_NOTICE);

		$r = call_user_func_array($funcname, $args);

	error_reporting($er);
	if (!$r)
		trigger_error('PclTar: '.PclErrorString($r));

	return $this->Done();
}

function Done() {
	$this->finished = ($this->progress[__TBK_TOTAL] == $this->progress[__TBK_DONE]);
	if ($this->finished)
		return true;

	$this->progress[__TBK_FNAME] = array_slice($this->progress[__TBK_FNAME], $this->i+1);
	$this->progress[__TBK_FSIZE] = array_slice($this->progress[__TBK_FSIZE], $this->i+1);

	return true;
}

function _slice($max_bytes, $rp = false) {
	$done = 0;

	$c = count($this->progress[__TBK_FNAME]);
	$lista = array();
	for ($i=0;$i<$c;$i++) {
		$done += $this->progress[__TBK_FSIZE][$i];
		$lista[] = ($rp ? $this->progress[__TBK_ROOT] : '').$this->progress[__TBK_FNAME][$i];
		if ($done>$max_bytes)
			break;
	}
	$this->progress[__TBK_DONE] += $done;

	$this->i = $i;

	return $lista;
}

function _loop($next_step_cb, $max_time, $method) {

	if ($max_time === null)
		$max_time = ini_get('max_execution_time');


	$start = mt_float();

	if ($this->$method()) {
		$this->_finalize($next_step_cb);
		return;
	}

	$chunks = ( ($max_time-1) / (mt_float() - $start));

	if ($this->$method( $chunks * __TBK_DEFAULT_CHUNK)) {
		$this->_finalize($next_step_cb);
		return;
	}

	while (!$this->$method()) {
		if (time()-$start>$max_time)
			break;
	}
	$this->_finalize($next_step_cb);
}


function _finalize($next_step_cb) {
	$next_step_cb(!$this->finished, $this->progress[__TBK_TOTAL], $this->progress[__TBK_DONE]);
	if ($this->finished) {	// will eventually free the associated session variable
		unset($this->progress[__TBK_FNAME]);
		unset($this->progress[__TBK_FSIZE]);
	}
}

}

?>