LZCompress now including UTF16

LZCompressor/LZUtil16.php

@@ -0,0 +1,90 @@
+<?php
+/**
+ * Created by PhpStorm.
+ * User: sics
+ * Date: 27.02.2016
+ * Time: 15:54
+ */
+
+namespace LZCompressor;
+
+
+class LZUtil16
+{
+
+    /**
+     * @return string
+     */
+    public static function fromCharCode()
+    {
+        return array_reduce(func_get_args(), function ($a, $b) {
+            $a .= self::utf16_chr($b);
+            return $a;
+        });
+    }
+
+    /**
+     * Phps chr() equivalent for UTF-16 encoding
+     *
+     * @param int|string $u
+     * @return string
+     */
+    public static function utf16_chr($u)
+    {
+        return mb_convert_encoding('&#' . intval($u) . ';', 'UTF-16', 'HTML-ENTITIES');
+    }
+
+    /**
+     * @param string $str
+     * @param int $num
+     *
+     * @return bool|integer
+     */
+    public static function charCodeAt($str, $num=0)
+    {
+        return self::utf16_ord(self::utf16_charAt($str, $num));
+    }
+
+    /**
+     * @source http://blog.sarabande.jp/post/35970262740
+     * @param string $ch
+     * @return bool|integer
+     */
+    function utf16_ord($ch) {
+        $length = strlen($ch);
+        if (2 === $length) {
+            return hexdec(bin2hex($ch));
+        } else if (4 === $length) {
+            $w1 = $ch[0].$ch[1];
+            $w2 = $ch[2].$ch[3];
+            if ($w1 < "\xD8\x00" || "\xDF\xFF" < $w1 || $w2 < "\xDC\x00" || "\xDF\xFF" < $w2) {
+                return false;
+            }
+            $w1 = (hexdec(bin2hex($w1)) & 0x3ff) << 10;
+            $w2 =  hexdec(bin2hex($w2)) & 0x3ff;
+            return $w1 + $w2 + 0x10000;
+        }
+        return false;
+    }
+
+    /**
+     * @param string $str
+     * @param integer $num
+     *
+     * @return string
+     */
+    public static function utf16_charAt($str, $num)
+    {
+        return mb_substr($str, $num, 1, 'UTF-16');
+    }
+
+    /**
+     * @param string $str
+     * @return integer
+     */
+    public static function utf16_strlen($str)
+    {
+        return mb_strlen($str, 'UTF-16');
+    }
+
+}