update Piwik to version 2.16 (fixes #91)

www/analytics/vendor/piwik/network/src/IPv6.php

@@ -0,0 +1,77 @@
+<?php
+/**
+ * Piwik - free/libre analytics platform
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ */
+
+namespace Piwik\Network;
+
+/**
+ * IP v6 address.
+ *
+ * This class is immutable, i.e. once created it can't be changed. Methods that modify it
+ * will always return a new instance.
+ */
+class IPv6 extends IP
+{
+    const MAPPED_IPv4_START = '::ffff:';
+
+    /**
+     * {@inheritdoc}
+     */
+    public function anonymize($byteCount)
+    {
+        $newBinaryIp = $this->ip;
+
+        if ($this->isMappedIPv4()) {
+            $i = strlen($newBinaryIp);
+            if ($byteCount > $i) {
+                $byteCount = $i;
+            }
+
+            while ($byteCount-- > 0) {
+                $newBinaryIp[--$i] = chr(0);
+            }
+
+            return self::fromBinaryIP($newBinaryIp);
+        }
+
+        $masks = array(
+            'ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff',
+            'ffff:ffff:ffff:ffff::',
+            'ffff:ffff:ffff:0000::',
+            'ffff:ff00:0000:0000::'
+        );
+
+        $newBinaryIp = $newBinaryIp & pack('a16', inet_pton($masks[$byteCount]));
+
+        return self::fromBinaryIP($newBinaryIp);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function toIPv4String()
+    {
+        $str = $this->toString();
+
+        if ($this->isMappedIPv4()) {
+            return substr($str, strlen(self::MAPPED_IPv4_START));
+        }
+
+        return null;
+    }
+
+    /**
+     * Returns true if this is a IPv4 mapped address, false otherwise.
+     *
+     * @return bool
+     */
+    public function isMappedIPv4()
+    {
+        return substr_compare($this->ip, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff", 0, 12) === 0
+                || substr_compare($this->ip, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 0, 12) === 0;
+    }
+}