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authorplegall <plg@piwigo.org>2016-04-26 11:07:44 +0200
committerplegall <plg@piwigo.org>2016-04-26 11:07:44 +0200
commitf51ee90c66527fd7ff634f3e8d414cb670da068d (patch)
tree2550f0753f14ed594dbf99cb65675fa02b49fe21 /include/random_compat/byte_safe_strings.php
parenta3c46de7511cb5b66f59375d225b1f0fb66ae988 (diff)
bug #470, use a dedicated lib to generate random bytes
Diffstat (limited to 'include/random_compat/byte_safe_strings.php')
-rw-r--r--include/random_compat/byte_safe_strings.php181
1 files changed, 181 insertions, 0 deletions
diff --git a/include/random_compat/byte_safe_strings.php b/include/random_compat/byte_safe_strings.php
new file mode 100644
index 000000000..dec5d3062
--- /dev/null
+++ b/include/random_compat/byte_safe_strings.php
@@ -0,0 +1,181 @@
+<?php
+/**
+ * Random_* Compatibility Library
+ * for using the new PHP 7 random_* API in PHP 5 projects
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 Paragon Initiative Enterprises
+ *
+ * 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.
+ */
+
+if (!function_exists('RandomCompat_strlen')) {
+ if (
+ defined('MB_OVERLOAD_STRING') &&
+ ini_get('mbstring.func_overload') & MB_OVERLOAD_STRING
+ ) {
+ /**
+ * strlen() implementation that isn't brittle to mbstring.func_overload
+ *
+ * This version uses mb_strlen() in '8bit' mode to treat strings as raw
+ * binary rather than UTF-8, ISO-8859-1, etc
+ *
+ * @param string $binary_string
+ *
+ * @throws TypeError
+ *
+ * @return int
+ */
+ function RandomCompat_strlen($binary_string)
+ {
+ if (!is_string($binary_string)) {
+ throw new TypeError(
+ 'RandomCompat_strlen() expects a string'
+ );
+ }
+
+ return mb_strlen($binary_string, '8bit');
+ }
+
+ } else {
+ /**
+ * strlen() implementation that isn't brittle to mbstring.func_overload
+ *
+ * This version just used the default strlen()
+ *
+ * @param string $binary_string
+ *
+ * @throws TypeError
+ *
+ * @return int
+ */
+ function RandomCompat_strlen($binary_string)
+ {
+ if (!is_string($binary_string)) {
+ throw new TypeError(
+ 'RandomCompat_strlen() expects a string'
+ );
+ }
+ return strlen($binary_string);
+ }
+ }
+}
+
+if (!function_exists('RandomCompat_substr')) {
+
+ if (
+ defined('MB_OVERLOAD_STRING')
+ &&
+ ini_get('mbstring.func_overload') & MB_OVERLOAD_STRING
+ ) {
+ /**
+ * substr() implementation that isn't brittle to mbstring.func_overload
+ *
+ * This version uses mb_substr() in '8bit' mode to treat strings as raw
+ * binary rather than UTF-8, ISO-8859-1, etc
+ *
+ * @param string $binary_string
+ * @param int $start
+ * @param int $length (optional)
+ *
+ * @throws TypeError
+ *
+ * @return string
+ */
+ function RandomCompat_substr($binary_string, $start, $length = null)
+ {
+ if (!is_string($binary_string)) {
+ throw new TypeError(
+ 'RandomCompat_substr(): First argument should be a string'
+ );
+ }
+
+ if (!is_int($start)) {
+ throw new TypeError(
+ 'RandomCompat_substr(): Second argument should be an integer'
+ );
+ }
+
+ if ($length === null) {
+ /**
+ * mb_substr($str, 0, NULL, '8bit') returns an empty string on
+ * PHP 5.3, so we have to find the length ourselves.
+ */
+ $length = RandomCompat_strlen($length) - $start;
+ } elseif (!is_int($length)) {
+ throw new TypeError(
+ 'RandomCompat_substr(): Third argument should be an integer, or omitted'
+ );
+ }
+
+ // Consistency with PHP's behavior
+ if ($start === RandomCompat_strlen($binary_string) && $length === 0) {
+ return '';
+ }
+ if ($start > RandomCompat_strlen($binary_string)) {
+ return false;
+ }
+
+ return mb_substr($binary_string, $start, $length, '8bit');
+ }
+
+ } else {
+
+ /**
+ * substr() implementation that isn't brittle to mbstring.func_overload
+ *
+ * This version just uses the default substr()
+ *
+ * @param string $binary_string
+ * @param int $start
+ * @param int $length (optional)
+ *
+ * @throws TypeError
+ *
+ * @return string
+ */
+ function RandomCompat_substr($binary_string, $start, $length = null)
+ {
+ if (!is_string($binary_string)) {
+ throw new TypeError(
+ 'RandomCompat_substr(): First argument should be a string'
+ );
+ }
+
+ if (!is_int($start)) {
+ throw new TypeError(
+ 'RandomCompat_substr(): Second argument should be an integer'
+ );
+ }
+
+ if ($length !== null) {
+ if (!is_int($length)) {
+ throw new TypeError(
+ 'RandomCompat_substr(): Third argument should be an integer, or omitted'
+ );
+ }
+
+ return substr($binary_string, $start, $length);
+ }
+
+ return substr($binary_string, $start);
+ }
+ }
+}