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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 - 2017 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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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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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 $length (optional)
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*
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* @throws TypeError
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*
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* @return string
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*/
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function RandomCompat_substr($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($str, 0, NULL, '8bit') returns an empty string on
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* PHP 5.3, so we have to find the length ourselves.
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*/
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$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($binary_string)) {
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return '';
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}
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return (string) mb_substr($binary_string, $start, $length, '8bit');
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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 $length (optional)
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*
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* @throws TypeError
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*
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* @return string
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*/
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function RandomCompat_substr($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($length)) {
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throw new TypeError(
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'RandomCompat_substr(): Third argument should be an integer, or omitted'
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);
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}
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return (string) substr($binary_string, $start, $length);
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}
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return (string) substr($binary_string, $start);
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}
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}
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}
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