Initial Commit

database/php/pear/PHP/Compat/Function/bcinvert.php

@@ -0,0 +1,76 @@
+<?php
+// +----------------------------------------------------------------------+
+// | PHP Version 4                                                        |
+// +----------------------------------------------------------------------+
+// | Copyright (c) 1997-2004 The PHP Group                                |
+// +----------------------------------------------------------------------+
+// | This source file is subject to version 3.0 of the PHP license,       |
+// | that is bundled with this package in the file LICENSE, and is        |
+// | available at through the world-wide-web at                           |
+// | http://www.php.net/license/3_0.txt.                                  |
+// | If you did not receive a copy of the PHP license and are unable to   |
+// | obtain it through the world-wide-web, please send a note to          |
+// | license@php.net so we can mail you a copy immediately.               |
+// +----------------------------------------------------------------------+
+// | Authors: Aidan Lister <aidan@php.net>                                |
+// +----------------------------------------------------------------------+
+//
+// $Id: bcinvert.php,v 1.2 2005/11/22 20:24:45 aidan Exp $
+
+
+/**
+ * Replace bcinvert()
+ *
+ * @category    PHP
+ * @package     PHP_Compat
+ * @link        http://php.net/function.bcinvert
+ * @author      Sara Golemon <pollita@php.net>
+ * @version     $Revision: 1.2 $
+ * @since       PHP 5.2.0
+ * @require     PHP 4.0.4 (call_user_func_array)
+ */
+if (!function_exists('bcinvert')) {
+    function bcinvert($a, $n)
+    {
+        // Sanity check
+        if (!is_scalar($a)) {
+            user_error('bcinvert() expects parameter 1 to be string, ' .
+                gettype($a) . ' given', E_USER_WARNING);
+            return false;
+        }
+
+        if (!is_scalar($n)) {
+            user_error('bcinvert() expects parameter 2 to be string, ' .
+                gettype($n) . ' given', E_USER_WARNING);
+            return false;
+        }
+        
+        $u1 = $v2 = '1';
+        $u2 = $v1 = '0';
+        $u3 = $n;
+        $v3 = $a;
+
+        while (bccomp($v3, '0')) {
+            $q0 = bcdiv($u3, $v3);
+            $t1 = bcsub($u1, bcmul($q0, $v1));
+            $t2 = bcsub($u2, bcmul($q0, $v2));
+            $t3 = bcsub($u3, bcmul($q0, $v3));
+
+            $u1 = $v1;
+            $u2 = $v2;
+            $u3 = $v3;
+
+            $v1 = $t1;
+            $v2 = $t2;
+            $v3 = $t3;
+        }
+
+        if (bccomp($u2, '0') < 0) {
+            return bcadd($u2, $n);
+        } else {
+            return bcmod($u2, $n);
+        }
+    }
+}
+
+?>