From f51ee90c66527fd7ff634f3e8d414cb670da068d Mon Sep 17 00:00:00 2001
From: plegall <plg@piwigo.org>
Date: Tue, 26 Apr 2016 11:07:44 +0200
Subject: bug #470, use a dedicated lib to generate random bytes

---
 include/random_compat/cast_to_int.php | 71 +++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 include/random_compat/cast_to_int.php

(limited to 'include/random_compat/cast_to_int.php')

diff --git a/include/random_compat/cast_to_int.php b/include/random_compat/cast_to_int.php
new file mode 100644
index 000000000..f441c5d98
--- /dev/null
+++ b/include/random_compat/cast_to_int.php
@@ -0,0 +1,71 @@
+<?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_intval')) {
+    
+    /**
+     * Cast to an integer if we can, safely.
+     * 
+     * If you pass it a float in the range (~PHP_INT_MAX, PHP_INT_MAX)
+     * (non-inclusive), it will sanely cast it to an int. If you it's equal to
+     * ~PHP_INT_MAX or PHP_INT_MAX, we let it fail as not an integer. Floats 
+     * lose precision, so the <= and => operators might accidentally let a float
+     * through.
+     * 
+     * @param int|float $number    The number we want to convert to an int
+     * @param boolean   $fail_open Set to true to not throw an exception
+     * 
+     * @return int (or float if $fail_open)
+     *
+     * @throws TypeError
+     */
+    function RandomCompat_intval($number, $fail_open = false)
+    {
+        if (is_numeric($number)) {
+            $number += 0;
+        }
+
+        if (
+            is_float($number)
+            &&
+            $number > ~PHP_INT_MAX
+            &&
+            $number < PHP_INT_MAX
+        ) {
+            $number = (int) $number;
+        }
+
+        if (is_int($number) || $fail_open) {
+            return $number;
+        }
+
+        throw new TypeError(
+            'Expected an integer.'
+        );
+    }
+}
-- 
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