s2member / src / vendor / paragonie / random_compat / lib / byte_safe_strings.php

byte_safe_strings.php in s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions 260917, at src/vendor/paragonie/random_compat/lib/byte_safe_strings.php

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1	<?php
2	/**
3	* Random_* Compatibility Library
4	* for using the new PHP 7 random_* API in PHP 5 projects
5	*
6	* The MIT License (MIT)
7	*
8	* Copyright (c) 2015 - 2017 Paragon Initiative Enterprises
9	*
10	* Permission is hereby granted, free of charge, to any person obtaining a copy
11	* of this software and associated documentation files (the "Software"), to deal
12	* in the Software without restriction, including without limitation the rights
13	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
14	* copies of the Software, and to permit persons to whom the Software is
15	* furnished to do so, subject to the following conditions:
16	*
17	* The above copyright notice and this permission notice shall be included in
18	* all copies or substantial portions of the Software.
19	*
20	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
23	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
24	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
25	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
26	* SOFTWARE.
27	*/
28
29	if (!is_callable('RandomCompat_strlen')) {
30	if (
31	defined('MB_OVERLOAD_STRING') &&
32	ini_get('mbstring.func_overload') & MB_OVERLOAD_STRING
33	) {
34	/**
35	* strlen() implementation that isn't brittle to mbstring.func_overload
36	*
37	* This version uses mb_strlen() in '8bit' mode to treat strings as raw
38	* binary rather than UTF-8, ISO-8859-1, etc
39	*
40	* @param string $binary_string
41	*
42	* @throws TypeError
43	*
44	* @return int
45	*/
46	function RandomCompat_strlen($binary_string)
47	{
48	if (!is_string($binary_string)) {
49	throw new TypeError(
50	'RandomCompat_strlen() expects a string'
51	);
52	}
53
54	return (int) mb_strlen($binary_string, '8bit');
55	}
56
57	} else {
58	/**
59	* strlen() implementation that isn't brittle to mbstring.func_overload
60	*
61	* This version just used the default strlen()
62	*
63	* @param string $binary_string
64	*
65	* @throws TypeError
66	*
67	* @return int
68	*/
69	function RandomCompat_strlen($binary_string)
70	{
71	if (!is_string($binary_string)) {
72	throw new TypeError(
73	'RandomCompat_strlen() expects a string'
74	);
75	}
76	return (int) strlen($binary_string);
77	}
78	}
79	}
80
81	if (!is_callable('RandomCompat_substr')) {
82
83	if (
84	defined('MB_OVERLOAD_STRING')
85	&&
86	ini_get('mbstring.func_overload') & MB_OVERLOAD_STRING
87	) {
88	/**
89	* substr() implementation that isn't brittle to mbstring.func_overload
90	*
91	* This version uses mb_substr() in '8bit' mode to treat strings as raw
92	* binary rather than UTF-8, ISO-8859-1, etc
93	*
94	* @param string $binary_string
95	* @param int $start
96	* @param int $length (optional)
97	*
98	* @throws TypeError
99	*
100	* @return string
101	*/
102	function RandomCompat_substr($binary_string, $start, $length = null)
103	{
104	if (!is_string($binary_string)) {
105	throw new TypeError(
106	'RandomCompat_substr(): First argument should be a string'
107	);
108	}
109
110	if (!is_int($start)) {
111	throw new TypeError(
112	'RandomCompat_substr(): Second argument should be an integer'
113	);
114	}
115
116	if ($length === null) {
117	/**
118	* mb_substr($str, 0, NULL, '8bit') returns an empty string on
119	* PHP 5.3, so we have to find the length ourselves.
120	*/
121	$length = RandomCompat_strlen($binary_string) - $start;
122	} elseif (!is_int($length)) {
123	throw new TypeError(
124	'RandomCompat_substr(): Third argument should be an integer, or omitted'
125	);
126	}
127
128	// Consistency with PHP's behavior
129	if ($start === RandomCompat_strlen($binary_string) && $length === 0) {
130	return '';
131	}
132	if ($start > RandomCompat_strlen($binary_string)) {
133	return '';
134	}
135
136	return (string) mb_substr($binary_string, $start, $length, '8bit');
137	}
138
139	} else {
140
141	/**
142	* substr() implementation that isn't brittle to mbstring.func_overload
143	*
144	* This version just uses the default substr()
145	*
146	* @param string $binary_string
147	* @param int $start
148	* @param int $length (optional)
149	*
150	* @throws TypeError
151	*
152	* @return string
153	*/
154	function RandomCompat_substr($binary_string, $start, $length = null)
155	{
156	if (!is_string($binary_string)) {
157	throw new TypeError(
158	'RandomCompat_substr(): First argument should be a string'
159	);
160	}
161
162	if (!is_int($start)) {
163	throw new TypeError(
164	'RandomCompat_substr(): Second argument should be an integer'
165	);
166	}
167
168	if ($length !== null) {
169	if (!is_int($length)) {
170	throw new TypeError(
171	'RandomCompat_substr(): Third argument should be an integer, or omitted'
172	);
173	}
174
175	return (string) substr($binary_string, $start, $length);
176	}
177
178	return (string) substr($binary_string, $start);
179	}
180	}
181	}
182