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<?php declare(strict_types=1); namespace ParagonIE\ConstantTime; /** * Copyright (c) 2016 - 2018 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 $str): int { if (\function_exists('mb_strlen')) { return (int) \mb_strlen($str, '8bit'); } else { return (int) \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); } } }