convert_uuencode.php.svn-base

来自「PHP 知识管理系统（基于树结构的知识管理系统）, 英文原版的PHP源码。」· SVN-BASE 代码 · 共 79 行

<?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          |
// | [e-mail] so we can mail you a copy immediately.               |
// +----------------------------------------------------------------------+
// | Authors: Michael Wallner <[e-mail]>                              |
// |          Aidan Lister <[e-mail]>                                |
// +----------------------------------------------------------------------+
//
// $Id$


/**
 * Replace convert_uuencode()
 *
 * @category    PHP
 * @package     PHP_Compat
 * @link        http://php.net/function.convert_uuencode
 * @author      Michael Wallner <[e-mail]>
 * @author      Aidan Lister <[e-mail]>
 * @version     $Revision$
 * @since       PHP 5
 * @require     PHP 4.0.0 (user_error)
 */
if (!function_exists('convert_uuencode')) {
    function convert_uuencode($string)
    {
        // Sanity check
        if (!is_scalar($string)) {
            user_error('convert_uuencode() expects parameter 1 to be string, ' .
                gettype($string) . ' given', E_USER_WARNING);
            return false;
        }

        $u = 0;
        $encoded = '';
        
        while ($c = count($bytes = unpack('c*', substr($string, $u, 45)))) {
            $u += 45;
            $encoded .= pack('c', $c + 0x20);

            while ($c % 3) {
                $bytes[++$c] = 0;
            }

            foreach (array_chunk($bytes, 3) as $b) {
                $b0 = ($b[0] & 0xFC) >> 2;
                $b1 = (($b[0] & 0x03) << 4) + (($b[1] & 0xF0) >> 4);
                $b2 = (($b[1] & 0x0F) << 2) + (($b[2] & 0xC0) >> 6);
                $b3 = $b[2] & 0x3F;
                
                $b0 = $b0 ? $b0 + 0x20 : 0x60;
                $b1 = $b1 ? $b1 + 0x20 : 0x60;
                $b2 = $b2 ? $b2 + 0x20 : 0x60;
                $b3 = $b3 ? $b3 + 0x20 : 0x60;
                
                $encoded .= pack('c*', $b0, $b1, $b2, $b3);
            }

            $encoded .= "\n";
        }
        
        // Add termination characters
        $encoded .= "\x60\n";

        return $encoded;
    }
}

?>