91 lines
2.7 KiB
PHP
91 lines
2.7 KiB
PHP
|
<?php
|
||
|
|
declare(strict_types=1);
|
||
|
|
namespace ParagonIE\ConstantTime;
|
||
|
|
|
||
|
|
use TypeError;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Copyright (c) 2016 - 2022 Paragon Initiative Enterprises.
|
||
|
|
* Copyright (c) 2014 Steve "Sc00bz" Thomas (steve at tobtu dot com)
|
||
|
|
*
|
||
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||
|
|
* of this software and associated documentation files (the "Software"), to deal
|
||
|
|
* in the Software without restriction, including without limitation the rights
|
||
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||
|
|
* copies of the Software, and to permit persons to whom the Software is
|
||
|
|
* furnished to do so, subject to the following conditions:
|
||
|
|
*
|
||
|
|
* The above copyright notice and this permission notice shall be included in all
|
||
|
|
* copies or substantial portions of the Software.
|
||
|
|
*
|
||
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||
|
|
* SOFTWARE.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Class Binary
|
||
|
|
*
|
||
|
|
* Binary string operators that don't choke on
|
||
|
|
* mbstring.func_overload
|
||
|
|
*
|
||
|
|
* @package ParagonIE\ConstantTime
|
||
|
|
*/
|
||
|
|
abstract class Binary
|
||
|
|
{
|
||
|
|
/**
|
||
|
|
* Safe string length
|
||
|
|
*
|
||
|
|
* @ref mbstring.func_overload
|
||
|
|
*
|
||
|
|
* @param string $str
|
||
|
|
* @return int
|
||
|
|
*/
|
||
|
|
public static function safeStrlen(string $str): int
|
||
|
|
{
|
||
|
|
if (\function_exists('mb_strlen')) {
|
||
|
|
// mb_strlen in PHP 7.x can return false.
|
||
|
|
/** @psalm-suppress RedundantCast */
|
||
|
|
return (int) \mb_strlen($str, '8bit');
|
||
|
|
} else {
|
||
|
|
return \strlen($str);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Safe substring
|
||
|
|
*
|
||
|
|
* @ref mbstring.func_overload
|
||
|
|
*
|
||
|
|
* @staticvar boolean $exists
|
||
|
|
* @param string $str
|
||
|
|
* @param int $start
|
||
|
|
* @param ?int $length
|
||
|
|
* @return string
|
||
|
|
*
|
||
|
|
* @throws TypeError
|
||
|
|
*/
|
||
|
|
public static function safeSubstr(
|
||
|
|
string $str,
|
||
|
|
int $start = 0,
|
||
|
|
$length = null
|
||
|
|
): string {
|
||
|
|
if ($length === 0) {
|
||
|
|
return '';
|
||
|
|
}
|
||
|
|
if (\function_exists('mb_substr')) {
|
||
|
|
return \mb_substr($str, $start, $length, '8bit');
|
||
|
|
}
|
||
|
|
// Unlike mb_substr(), substr() doesn't accept NULL for length
|
||
|
|
if ($length !== null) {
|
||
|
|
return \substr($str, $start, $length);
|
||
|
|
} else {
|
||
|
|
return \substr($str, $start);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|