Add upstream plugins

Signed-off-by: Adrian Nöthlich <git@promasu.tech>

wp-content/plugins/all-in-one-event-calendar/lib/compatibility/memory.php

@@ -0,0 +1,69 @@
+<?php
+
+/**
+ * Memory related methods.
+ *
+ * @author     Time.ly Network Inc.
+ * @since      2.1
+ *
+ * @package    AI1EC
+ * @subpackage AI1EC.Lib
+ */
+class Ai1ec_Compatibility_Memory extends Ai1ec_Base {
+
+    /**
+     * Checks if there is enough available free memory.
+     *
+     * @param string $required_limit String memory value i.e '24M'
+     *
+     * @return bool True or false.
+     */
+    public function check_available_memory( $required_limit = 0 ) {
+        if ( 0 === $required_limit ) {
+            return true;
+        }
+        $required = $this->_string_to_bytes( $required_limit );
+        $limit    = $this->_string_to_bytes( ini_get( 'memory_limit' ) );
+        $used     = $this->get_usage();
+        return ( $limit - $used ) >= $required;
+    }
+
+    /**
+     * Returns current memory usage if available - otherwise 0.
+     *
+     * @return int Memory usage.
+     */
+    public function get_usage() {
+        if ( is_callable( 'memory_get_usage' ) ) {
+            return memory_get_usage();
+        }
+        return 0;
+    }
+
+    /**
+     * Converts string value to int.
+     *
+     * @param string $v String value.
+     *
+     * @return int Number.
+     */
+    protected function _string_to_bytes( $v ) {
+        $letter     = substr( $v, -1 );
+        $value      = (int)substr( $v, 0, -1 );
+        $powers     = array(
+            'K' => 10,
+            'M' => 20,
+            'G' => 30,
+            'T' => 40,
+            'P' => 50,
+        );
+        $multiplier = 1;
+        if ( isset( $powers[$letter] ) ) {
+            $multiplier = pow( 2, $powers[$letter] );
+        }
+        if ( 1 === $multiplier ) {
+            return (int)$v;
+        }
+        return $value * $multiplier;
+    }
+}