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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 827 | daniel-mar | 1 | <?php |
| 2 | declare(strict_types=1); |
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| 3 | namespace ParagonIE\ConstantTime; |
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| 4 | |||
| 874 | daniel-mar | 5 | use TypeError; |
| 6 | |||
| 827 | daniel-mar | 7 | /** |
| 874 | daniel-mar | 8 | * Copyright (c) 2016 - 2022 Paragon Initiative Enterprises. |
| 827 | daniel-mar | 9 | * Copyright (c) 2014 Steve "Sc00bz" Thomas (steve at tobtu dot com) |
| 10 | * |
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| 11 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
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| 12 | * of this software and associated documentation files (the "Software"), to deal |
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| 13 | * in the Software without restriction, including without limitation the rights |
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| 14 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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| 15 | * copies of the Software, and to permit persons to whom the Software is |
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| 16 | * furnished to do so, subject to the following conditions: |
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| 17 | * |
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| 18 | * The above copyright notice and this permission notice shall be included in all |
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| 19 | * copies or substantial portions of the Software. |
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| 20 | * |
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| 21 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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| 22 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 23 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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| 24 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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| 25 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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| 26 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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| 27 | * SOFTWARE. |
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| 28 | */ |
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| 29 | |||
| 30 | /** |
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| 31 | * Class Binary |
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| 32 | * |
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| 33 | * Binary string operators that don't choke on |
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| 34 | * mbstring.func_overload |
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| 35 | * |
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| 36 | * @package ParagonIE\ConstantTime |
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| 37 | */ |
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| 38 | abstract class Binary |
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| 39 | { |
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| 40 | /** |
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| 41 | * Safe string length |
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| 42 | * |
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| 43 | * @ref mbstring.func_overload |
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| 44 | * |
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| 45 | * @param string $str |
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| 46 | * @return int |
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| 47 | */ |
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| 48 | public static function safeStrlen(string $str): int |
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| 49 | { |
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| 50 | if (\function_exists('mb_strlen')) { |
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| 51 | // mb_strlen in PHP 7.x can return false. |
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| 52 | /** @psalm-suppress RedundantCast */ |
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| 53 | return (int) \mb_strlen($str, '8bit'); |
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| 54 | } else { |
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| 55 | return \strlen($str); |
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| 56 | } |
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| 57 | } |
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| 58 | |||
| 59 | /** |
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| 60 | * Safe substring |
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| 61 | * |
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| 62 | * @ref mbstring.func_overload |
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| 63 | * |
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| 64 | * @staticvar boolean $exists |
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| 65 | * @param string $str |
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| 66 | * @param int $start |
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| 67 | * @param ?int $length |
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| 68 | * @return string |
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| 874 | daniel-mar | 69 | * |
| 70 | * @throws TypeError |
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| 827 | daniel-mar | 71 | */ |
| 72 | public static function safeSubstr( |
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| 73 | string $str, |
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| 74 | int $start = 0, |
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| 75 | $length = null |
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| 76 | ): string { |
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| 77 | if ($length === 0) { |
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| 78 | return ''; |
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| 79 | } |
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| 80 | if (\function_exists('mb_substr')) { |
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| 81 | return \mb_substr($str, $start, $length, '8bit'); |
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| 82 | } |
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| 83 | // Unlike mb_substr(), substr() doesn't accept NULL for length |
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| 84 | if ($length !== null) { |
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| 85 | return \substr($str, $start, $length); |
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| 86 | } else { |
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| 87 | return \substr($str, $start); |
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| 88 | } |
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| 89 | } |
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| 90 | } |