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<?php |
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/** |
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* Random_* Compatibility Library |
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* for using the new PHP 7 random_* API in PHP 5 projects |
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* |
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* The MIT License (MIT) |
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* |
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* Copyright (c) 2015 - 2018 Paragon Initiative Enterprises |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in |
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* all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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* SOFTWARE. |
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*/ |
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if (!is_callable('RandomCompat_strlen')) { |
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if ( |
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defined('MB_OVERLOAD_STRING') |
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&& |
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((int) ini_get('mbstring.func_overload')) & MB_OVERLOAD_STRING |
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) { |
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/** |
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* strlen() implementation that isn't brittle to mbstring.func_overload |
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* |
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* This version uses mb_strlen() in '8bit' mode to treat strings as raw |
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* binary rather than UTF-8, ISO-8859-1, etc |
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* |
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* @param string $binary_string |
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* |
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* @throws TypeError |
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* |
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* @return int |
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*/ |
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function RandomCompat_strlen($binary_string) |
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{ |
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if (!is_string($binary_string)) { |
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throw new TypeError( |
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'RandomCompat_strlen() expects a string' |
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); |
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} |
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return (int) mb_strlen($binary_string, '8bit'); |
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} |
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} else { |
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/** |
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* strlen() implementation that isn't brittle to mbstring.func_overload |
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* |
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* This version just used the default strlen() |
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* |
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* @param string $binary_string |
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* |
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* @throws TypeError |
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* |
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* @return int |
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*/ |
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function RandomCompat_strlen($binary_string) |
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{ |
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if (!is_string($binary_string)) { |
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throw new TypeError( |
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'RandomCompat_strlen() expects a string' |
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); |
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} |
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return (int) strlen($binary_string); |
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} |
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} |
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} |
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if (!is_callable('RandomCompat_substr')) { |
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if ( |
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defined('MB_OVERLOAD_STRING') |
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&& |
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((int) ini_get('mbstring.func_overload')) & MB_OVERLOAD_STRING |
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) { |
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/** |
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* substr() implementation that isn't brittle to mbstring.func_overload |
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* |
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* This version uses mb_substr() in '8bit' mode to treat strings as raw |
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* binary rather than UTF-8, ISO-8859-1, etc |
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* |
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* @param string $binary_string |
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* @param int $start |
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* @param int|null $length (optional) |
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* |
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* @throws TypeError |
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* |
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* @return string |
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*/ |
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function RandomCompat_substr($binary_string, $start, $length = null) |
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{ |
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if (!is_string($binary_string)) { |
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throw new TypeError( |
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'RandomCompat_substr(): First argument should be a string' |
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); |
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} |
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if (!is_int($start)) { |
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throw new TypeError( |
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'RandomCompat_substr(): Second argument should be an integer' |
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); |
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} |
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if ($length === null) { |
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/** |
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* mb_substr($str, 0, NULL, '8bit') returns an empty string on |
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* PHP 5.3, so we have to find the length ourselves. |
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*/ |
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/** @var int $length */ |
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$length = RandomCompat_strlen($binary_string) - $start; |
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} elseif (!is_int($length)) { |
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throw new TypeError( |
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'RandomCompat_substr(): Third argument should be an integer, or omitted' |
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); |
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} |
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// Consistency with PHP's behavior |
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if ($start === RandomCompat_strlen($binary_string) && $length === 0) { |
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return ''; |
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} |
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if ($start > RandomCompat_strlen($binary_string)) { |
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return ''; |
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} |
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return (string) mb_substr( |
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(string) $binary_string, |
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(int) $start, |
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(int) $length, |
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'8bit' |
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); |
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} |
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} else { |
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/** |
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* substr() implementation that isn't brittle to mbstring.func_overload |
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* |
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* This version just uses the default substr() |
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* |
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* @param string $binary_string |
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* @param int $start |
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* @param int|null $length (optional) |
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* |
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* @throws TypeError |
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* |
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* @return string |
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*/ |
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function RandomCompat_substr($binary_string, $start, $length = null) |
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{ |
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if (!is_string($binary_string)) { |
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throw new TypeError( |
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'RandomCompat_substr(): First argument should be a string' |
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); |
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} |
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if (!is_int($start)) { |
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throw new TypeError( |
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'RandomCompat_substr(): Second argument should be an integer' |
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); |
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} |
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if ($length !== null) { |
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if (!is_int($length)) { |
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throw new TypeError( |
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'RandomCompat_substr(): Third argument should be an integer, or omitted' |
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); |
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} |
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return (string) substr( |
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(string )$binary_string, |
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(int) $start, |
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(int) $length |
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); |
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} |
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return (string) substr( |
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(string) $binary_string, |
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(int) $start |
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); |
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} |
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} |
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} |
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