Data Encoding Tutorials - Herong's Tutorial Examples - v5.23, by Herong Yang
PHP - convert_uuencode() and convert_uudecode()
This section provides the source code of the PHP implementation of UUEncode by php.net.
If you are interested in how UUEncode can be implemented in PHP, here is a copy of the source code of the PHP implementation of the UUEncode encoding algorithm by php.net, convert_uuencode.php:
<?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: Michael Wallner <mike@php.net> // Aidan Lister <aidan@php.net> // ------------------------------------------------------------------ // // $Id: convert_uuencode.php,v 1.7 2005/01/26 04:55:13 aidan Exp $ /** * Replace convert_uuencode() * * @category PHP * @package PHP_Compat * @link http://php.net/function.convert_uuencode * @author Michael Wallner <mike@php.net> * @author Aidan Lister <aidan@php.net> * @version $Revision: 1.7 $ * @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; } } ?>
A copy of the source of the decoding process is listed below: convert_uudecode.php:
<?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: Michael Wallner <mike@php.net> // Aidan Lister <aidan@php.net> // ------------------------------------------------------------------ // // $Id: convert_uudecode.php,v 1.8 2005/01/26 04:55:13 aidan Exp $ /** * Replace convert_uudecode() * * @category PHP * @package PHP_Compat * @link http://php.net/function.convert_uudecode * @author Michael Wallner <mike@php.net> * @author Aidan Lister <aidan@php.net> * @version $Revision: 1.8 $ * @since PHP 5 * @require PHP 4.0.0 (user_error) */ if (!function_exists('convert_uudecode')) { function convert_uudecode($string) { // Sanity check if (!is_scalar($string)) { user_error('convert_uuencode() expects parameter 1 to be' . ' string, ' . gettype($string) . ' given', E_USER_WARNING); return false; } if (strlen($string) < 8) { user_error('convert_uuencode() The given parameter is not' . ' a valid uuencoded string', E_USER_WARNING); return false; } $decoded = ''; foreach (explode("\n", $string) as $line) { $c = count($bytes = unpack('c*', substr(trim($line), 1))); while ($c % 4) { $bytes[++$c] = 0; } foreach (array_chunk($bytes, 4) as $b) { $b0 = $b[0] == 0x60 ? 0 : $b[0] - 0x20; $b1 = $b[1] == 0x60 ? 0 : $b[1] - 0x20; $b2 = $b[2] == 0x60 ? 0 : $b[2] - 0x20; $b3 = $b[3] == 0x60 ? 0 : $b[3] - 0x20; $b0 <<= 2; $b0 |= ($b1 >> 4) & 0x03; $b1 <<= 4; $b1 |= ($b2 >> 2) & 0x0F; $b2 <<= 6; $b2 |= $b3 & 0x3F; $decoded .= pack('c*', $b0, $b1, $b2); } } return rtrim($decoded, "\0"); } } ?>
Table of Contents
Base64 Encoding and Decoding Tools
Base64URL - URL Safe Base64 Encoding
URL Encoding, URI Encoding, or Percent Encoding
Sun Implementation of UUEnccode in Java
Correction to Sun Implementation of UUEnccode