<?php /** * ZeroBin * * a zero-knowledge paste bin * * @link http://sebsauvage.net/wiki/doku.php?id=php:zerobin * @copyright 2012 Sébastien SAUVAGE (sebsauvage.net) * @license http://www.opensource.org/licenses/zlib-license.php The zlib/libpng License * @version 0.22 */ /** * filter * * Provides data filtering functions. */ class filter { /** * strips slashes deeply * * @access public * @static * @param mixed $value * @return mixed */ public static function stripslashes_deep($value) { return is_array($value) ? array_map('filter::stripslashes_deep', $value) : stripslashes($value); } /** * format a given time string into a human readable label (localized) * * accepts times in the format "[integer][time unit]" * * @access public * @static * @param string $time * @throws Exception * @return string */ public static function time_humanreadable($time) { if (preg_match('/^(\d+) *(\w+)$/', $time, $matches) !== 1) { throw new Exception("Error parsing time format '$time'", 30); } switch ($matches[2]) { case 'sec': $unit = 'second'; break; case 'min': $unit = 'minute'; break; default: $unit = rtrim($matches[2], 's'); } return i18n::_(array('%d ' . $unit, '%d ' . $unit . 's'), (int) $matches[1]); } /** * format a given number of bytes in IEC 80000-13:2008 notation (localized) * * @access public * @static * @param int $size * @return string */ public static function size_humanreadable($size) { $iec = array('B', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB'); $i = 0; while ( ( $size / 1024 ) >= 1 ) { $size = $size / 1024; $i++; } return number_format($size, ($i ? 2 : 0), '.', ' ') . ' ' . i18n::_($iec[$i]); } /** * fixed time string comparison operation to prevent timing attacks * https://crackstation.net/hashing-security.htm?=rd#slowequals * * @access public * @static * @param string $a * @param string $b * @return bool */ public static function slow_equals($a, $b) { $diff = strlen($a) ^ strlen($b); for($i = 0; $i < strlen($a) && $i < strlen($b); $i++) { $diff |= ord($a[$i]) ^ ord($b[$i]); } return $diff === 0; } }