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<?php
/**
* @copyright Copyright (c) 2018 Matthias Held <matthias.held@uni-konstanz.de>
* @author Matthias Held <matthias.held@uni-konstanz.de>
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
namespace OCA\RansomwareDetection\Analyzer;
use OCA\RansomwareDetection\Monitor;
class SequenceSizeAnalyzer
{
/**
* Size of information files.
*
* @var int
*/
const SIZE_OF_INFO_FILES = 5000000;
/**
* Sequence size class.
*
* @var int
*/
const EQUAL_SIZE = 1;
const DIFF_SIZE = 2;
/**
* Compares the sum of the size of the files written and deleted.
*
* @param array $sequence
*
* @return int
*/
public function analyze($sequence)
{
$sizeOfWrittenFiles = 0;
$sizeOfDeletedFiles = 0;
foreach ($sequence as $file) {
switch ($file->getCommand()) {
case Monitor::WRITE:
$sizeOfWrittenFiles = $sizeOfWrittenFiles + $file->getSize();
break;
case Monitor::READ:
break;
case Monitor::RENAME:
break;
case Monitor::DELETE:
$sizeOfDeletedFiles = $sizeOfDeletedFiles + $file->getSize();
break;
default:
break;
}
}
if ($sizeOfWrittenFiles <= ($sizeOfDeletedFiles + self::SIZE_OF_INFO_FILES) && $sizeOfWrittenFiles >= $sizeOfDeletedFiles) {
return self::EQUAL_SIZE;
} else {
return self::DIFF_SIZE;
}
}
}
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