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<?php

/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */

// +-----------------------------------------------------------------------+

// | Copyright (c) 2002-2003  Richard Heyes                                |

// | Copyright (c) 2003-2005  The PHP Group                                |

// | All rights reserved.                                                  |

// |                                                                       |

// | Redistribution and use in source and binary forms, with or without    |

// | modification, are permitted provided that the following conditions    |

// | are met:                                                              |

// |                                                                       |

// | o Redistributions of source code must retain the above copyright      |

// |   notice, this list of conditions and the following disclaimer.       |

// | o Redistributions in binary form must reproduce the above copyright   |

// |   notice, this list of conditions and the following disclaimer in the |

// |   documentation and/or other materials provided with the distribution.|

// | o The names of the authors may not be used to endorse or promote      |

// |   products derived from this software without specific prior written  |

// |   permission.                                                         |

// |                                                                       |

// | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS   |

// | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT     |

// | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |

// | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT  |

// | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |

// | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT      |

// | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |

// | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |

// | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT   |

// | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |

// | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.  |

// |                                                                       |

// +-----------------------------------------------------------------------+

// | Author: Richard Heyes <richard@phpguru.org>                           |

// +-----------------------------------------------------------------------+

require_once 'PEAR.php';

/**

*  +----------------------------- IMPORTANT ------------------------------+

*  | Usage of this class compared to native php extensions such as        |

*  | mailparse or imap, is slow and may be feature deficient. If available|

*  | you are STRONGLY recommended to use the php extensions.              |

*  +----------------------------------------------------------------------+

*

* Mime Decoding class

*

* This class will parse a raw mime email and return

* the structure. Returned structure is similar to

* that returned by imap_fetchstructure().

*

* USAGE: (assume $input is your raw email)

*

* $decode = new Mail_mimeDecode($input, "\r\n");

* $structure = $decode->decode();

* print_r($structure);

*

* Or statically:

*

* $params['input'] = $input;

* $structure = Mail_mimeDecode::decode($params);

* print_r($structure);

*

* TODO:

*  o Implement multipart/appledouble

*  o UTF8: ???

		> 4. We have also found a solution for decoding the UTF-8

		> headers. Therefore I made the following function:

		>

		> function decode_utf8($txt) {

		> $trans=array("ő"=>"õ","ű"=>"û","Ő"=>"Õ","Ű"

		=>"Û");

		> $txt=strtr($txt,$trans);

		> return(utf8_decode($txt));

		> }

		>

		> And I have inserted the following line to the class:

		>

		> if (strtolower($charset)=="utf-8") $text=decode_utf8($text);

		>

		> ... before the following one in the "_decodeHeader" function:

		>

		> $input = str_replace($encoded, $text, $input);

		>

		> This way from now on it can easily decode the UTF-8 headers too.

*

* @author  Richard Heyes <richard@phpguru.org>

* @version $Revision: 1.1 $

* @package Mail

*/

class Mail_mimeDecode extends PEAR

{

    /**

     * The raw email to decode

     * @var    string

     */

    var $_input;

    /**

     * The header part of the input

     * @var    string

     */

    var $_header;

    /**

     * The body part of the input

     * @var    string

     */

    var $_body;

    /**

     * If an error occurs, this is used to store the message

     * @var    string

     */

    var $_error;

    /**

     * Flag to determine whether to include bodies in the

     * returned object.

     * @var    boolean

     */

    var $_include_bodies;

    /**

     * Flag to determine whether to decode bodies

     * @var    boolean

     */

    var $_decode_bodies;

    /**

     * Flag to determine whether to decode headers

     * @var    boolean

     */

    var $_decode_headers;

    /**

     * Constructor.

     *

     * Sets up the object, initialise the variables, and splits and

     * stores the header and body of the input.

     *

     * @param string The input to decode

     * @access public

     */

    function Mail_mimeDecode($input)

    {

        list($header, $body)   = $this->_splitBodyHeader($input);

        $this->_input          = $input;

        $this->_header         = $header;

        $this->_body           = $body;

        $this->_decode_bodies  = false;

        $this->_include_bodies = true;

    }

    /**

     * Begins the decoding process. If called statically

     * it will create an object and call the decode() method

     * of it.

     *

     * @param array An array of various parameters that determine

     *              various things:

     *              include_bodies - Whether to include the body in the returned

     *                               object.

     *              decode_bodies  - Whether to decode the bodies

     *                               of the parts. (Transfer encoding)

     *              decode_headers - Whether to decode headers

     *              input          - If called statically, this will be treated

     *                               as the input

     * @return object Decoded results

     * @access public

     */

    function decode($params = null)

    {

        // determine if this method has been called statically

        $isStatic = !(isset($this) && get_class($this) == __CLASS__);

        // Have we been called statically?

	// If so, create an object and pass details to that.

        if ($isStatic AND isset($params['input'])) {

            $obj = new Mail_mimeDecode($params['input']);

            $structure = $obj->decode($params);

        // Called statically but no input

        } elseif ($isStatic) {

            return PEAR::raiseError('Called statically and no input given');

        // Called via an object

        } else {

            $this->_include_bodies = isset($params['include_bodies']) ?

	                             $params['include_bodies'] : false;

            $this->_decode_bodies  = isset($params['decode_bodies']) ?

	                             $params['decode_bodies']  : false;

            $this->_decode_headers = isset($params['decode_headers']) ?

	                             $params['decode_headers'] : false;

            $structure = $this->_decode($this->_header, $this->_body);

            if ($structure === false) {

                $structure = $this->raiseError($this->_error);

            }

        }

        return $structure;

    }

    /**

     * Performs the decoding. Decodes the body string passed to it

     * If it finds certain content-types it will call itself in a

     * recursive fashion

     *

     * @param string Header section

     * @param string Body section

     * @return object Results of decoding process

     * @access private

     */

    function _decode($headers, $body, $default_ctype = 'text/plain')

    {

        $return = new stdClass;

        $return->headers = array();

        $headers = $this->_parseHeaders($headers);

        foreach ($headers as $value) {

            if (isset($return->headers[strtolower($value['name'])]) AND !is_array($return->headers[strtolower($value['name'])])) {

                $return->headers[strtolower($value['name'])]   = array($return->headers[strtolower($value['name'])]);

                $return->headers[strtolower($value['name'])][] = $value['value'];

            } elseif (isset($return->headers[strtolower($value['name'])])) {

                $return->headers[strtolower($value['name'])][] = $value['value'];

            } else {

                $return->headers[strtolower($value['name'])] = $value['value'];

            }

        }

        reset($headers);

        while (list($key, $value) = each($headers)) {

            $headers[$key]['name'] = strtolower($headers[$key]['name']);

            switch ($headers[$key]['name']) {

                case 'content-type':

                    $content_type = $this->_parseHeaderValue($headers[$key]['value']);

                    if (preg_match('/([0-9a-z+.-]+)\/([0-9a-z+.-]+)/i', $content_type['value'], $regs)) {

                        $return->ctype_primary   = $regs[1];

                        $return->ctype_secondary = $regs[2];

                    }

                    if (isset($content_type['other'])) {

                        while (list($p_name, $p_value) = each($content_type['other'])) {

                            $return->ctype_parameters[$p_name] = $p_value;

                        }

                    }

                    break;

                case 'content-disposition':

                    $content_disposition = $this->_parseHeaderValue($headers[$key]['value']);

                    $return->disposition   = $content_disposition['value'];

                    if (isset($content_disposition['other'])) {

                        while (list($p_name, $p_value) = each($content_disposition['other'])) {

                            $return->d_parameters[$p_name] = $p_value;

                        }

                    }

                    break;

                case 'content-transfer-encoding':

                    $content_transfer_encoding = $this->_parseHeaderValue($headers[$key]['value']);

                    break;

            }

        }

        if (isset($content_type)) {

            switch (strtolower($content_type['value'])) {

                case 'text/plain':

                    $encoding = isset($content_transfer_encoding) ? $content_transfer_encoding['value'] : '7bit';

                    $this->_include_bodies ? $return->body = ($this->_decode_bodies ? $this->_decodeBody($body, $encoding) : $body) : null;

                    break;

                case 'text/html':

                    $encoding = isset($content_transfer_encoding) ? $content_transfer_encoding['value'] : '7bit';

                    $this->_include_bodies ? $return->body = ($this->_decode_bodies ? $this->_decodeBody($body, $encoding) : $body) : null;

                    break;

                case 'multipart/parallel':

                case 'multipart/report': // RFC1892

                case 'multipart/signed': // PGP

                case 'multipart/digest':

                case 'multipart/alternative':

                case 'multipart/related':

                case 'multipart/mixed':

                    if(!isset($content_type['other']['boundary'])){

                        $this->_error = 'No boundary found for ' . $content_type['value'] . ' part';

                        return false;

                    }

                    $default_ctype = (strtolower($content_type['value']) === 'multipart/digest') ? 'message/rfc822' : 'text/plain';

                    $parts = $this->_boundarySplit($body, $content_type['other']['boundary']);

                    for ($i = 0; $i < count($parts); $i++) {

                        list($part_header, $part_body) = $this->_splitBodyHeader($parts[$i]);

                        $part = $this->_decode($part_header, $part_body, $default_ctype);

                        if($part === false)

                            $part = $this->raiseError($this->_error);

                        $return->parts[] = $part;

                    }

                    break;

                case 'message/rfc822':

                    $obj = &new Mail_mimeDecode($body);

                    $return->parts[] = $obj->decode(array('include_bodies' => $this->_include_bodies,

					                                      'decode_bodies'  => $this->_decode_bodies,

														  'decode_headers' => $this->_decode_headers));

                    unset($obj);

                    break;

                default:

                    if(!isset($content_transfer_encoding['value']))

                        $content_transfer_encoding['value'] = '7bit';

                    $this->_include_bodies ? $return->body = ($this->_decode_bodies ? $this->_decodeBody($body, $content_transfer_encoding['value']) : $body) : null;

                    break;

            }

        } else {

            $ctype = explode('/', $default_ctype);

            $return->ctype_primary   = $ctype[0];

            $return->ctype_secondary = $ctype[1];

            $this->_include_bodies ? $return->body = ($this->_decode_bodies ? $this->_decodeBody($body) : $body) : null;

        }

        return $return;

    }

    /**

     * Given the output of the above function, this will return an

     * array of references to the parts, indexed by mime number.

     *

     * @param  object $structure   The structure to go through

     * @param  string $mime_number Internal use only.

     * @return array               Mime numbers

     */

    function &getMimeNumbers(&$structure, $no_refs = false, $mime_number = '', $prepend = '')

    {

        $return = array();

        if (!empty($structure->parts)) {

            if ($mime_number != '') {

                $structure->mime_id = $prepend . $mime_number;

                $return[$prepend . $mime_number] = &$structure;

            }

            for ($i = 0; $i < count($structure->parts); $i++) {

                if (!empty($structure->headers['content-type']) AND substr(strtolower($structure->headers['content-type']), 0, 8) == 'message/') {

                    $prepend      = $prepend . $mime_number . '.';

                    $_mime_number = '';

                } else {

                    $_mime_number = ($mime_number == '' ? $i + 1 : sprintf('%s.%s', $mime_number, $i + 1));

                }

                $arr = &Mail_mimeDecode::getMimeNumbers($structure->parts[$i], $no_refs, $_mime_number, $prepend);

                foreach ($arr as $key => $val) {

                    $no_refs ? $return[$key] = '' : $return[$key] = &$arr[$key];

                }

            }

        } else {

            if ($mime_number == '') {

                $mime_number = '1';

            }

            $structure->mime_id = $prepend . $mime_number;

            $no_refs ? $return[$prepend . $mime_number] = '' : $return[$prepend . $mime_number] = &$structure;

        }

        return $return;

    }

    /**

     * Given a string containing a header and body

     * section, this function will split them (at the first

     * blank line) and return them.

     *

     * @param string Input to split apart

     * @return array Contains header and body section

     * @access private

     */

    function _splitBodyHeader($input)

    {

        if (preg_match("/^(.*?)\r?\n\r?\n(.*)/s", $input, $match)) {

            return array($match[1], $match[2]);

        }

        $this->_error = 'Could not split header and body';

        return false;

    }

    /**

     * Parse headers given in $input and return

     * as assoc array.

     *

     * @param string Headers to parse

     * @return array Contains parsed headers

     * @access private

     */

    function _parseHeaders($input)

    {

        if ($input !== '') {

            // Unfold the input

            $input   = preg_replace("/\r?\n/", "\r\n", $input);

            $input   = preg_replace("/\r\n(\t| )+/", ' ', $input);

            $headers = explode("\r\n", trim($input));

            foreach ($headers as $value) {

                $hdr_name = substr($value, 0, $pos = strpos($value, ':'));

                $hdr_value = substr($value, $pos+1);

                if($hdr_value[0] == ' ')

                    $hdr_value = substr($hdr_value, 1);

                $return[] = array(

                                  'name'  => $hdr_name,

                                  'value' => $this->_decode_headers ? $this->_decodeHeader($hdr_value) : $hdr_value

                                 );

            }

        } else {

            $return = array();

        }

        return $return;

    }

    /**

     * Function to parse a header value,

     * extract first part, and any secondary

     * parts (after ;) This function is not as

     * robust as it could be. Eg. header comments

     * in the wrong place will probably break it.

     *

     * @param string Header value to parse

     * @return array Contains parsed result

     * @access private

     */

    function _parseHeaderValue($input)

    {

        if (($pos = strpos($input, ';')) !== false) {

            $return['value'] = trim(substr($input, 0, $pos));

            $input = trim(substr($input, $pos+1));

            if (strlen($input) > 0) {

                // This splits on a semi-colon, if there's no preceeding backslash

                // Now works with quoted values; had to glue the \; breaks in PHP

                // the regex is already bordering on incomprehensible

                $splitRegex = '/([^;\'"]*[\'"]([^\'"]*([^\'"]*)*)[\'"][^;\'"]*|([^;]+))(;|$)/';

                preg_match_all($splitRegex, $input, $matches);

                $parameters = array();

                for ($i=0; $i<count($matches[0]); $i++) {

                    $param = $matches[0][$i];

                    while (substr($param, -2) == '\;') {

                        $param .= $matches[0][++$i];

                    }

                    $parameters[] = $param;

                }

                for ($i = 0; $i < count($parameters); $i++) {

                    $param_name  = trim(substr($parameters[$i], 0, $pos = strpos($parameters[$i], '=')), "'\";\t\\ ");

                    $param_value = trim(str_replace('\;', ';', substr($parameters[$i], $pos + 1)), "'\";\t\\ ");

                    if ($param_value[0] == '"') {

                        $param_value = substr($param_value, 1, -1);

                    }

                    $return['other'][$param_name] = $param_value;

                    $return['other'][strtolower($param_name)] = $param_value;

                }

            }

        } else {

            $return['value'] = trim($input);

        }

        return $return;

    }

    /**

     * This function splits the input based

     * on the given boundary

     *

     * @param string Input to parse

     * @return array Contains array of resulting mime parts

     * @access private

     */

    function _boundarySplit($input, $boundary)

    {

        $parts = array();

        $bs_possible = substr($boundary, 2, -2);

        $bs_check = '\"' . $bs_possible . '\"';

        if ($boundary == $bs_check) {

            $boundary = $bs_possible;

        }

        $tmp = explode('--' . $boundary, $input);

        for ($i = 1; $i < count($tmp) - 1; $i++) {

            $parts[] = $tmp[$i];

        }

        return $parts;

    }

    /**

     * Given a header, this function will decode it

     * according to RFC2047. Probably not *exactly*

     * conformant, but it does pass all the given

     * examples (in RFC2047).

     *

     * @param string Input header value to decode

     * @return string Decoded header value

     * @access private

     */

    function _decodeHeader($input)

    {

        // Remove white space between encoded-words

        $input = preg_replace('/(=\?[^?]+\?(q|b)\?[^?]*\?=)(\s)+=\?/i', '\1=?', $input);

        // For each encoded-word...

        while (preg_match('/(=\?([^?]+)\?(q|b)\?([^?]*)\?=)/i', $input, $matches)) {

            $encoded  = $matches[1];

            $charset  = $matches[2];

            $encoding = $matches[3];

            $text     = $matches[4];

            switch (strtolower($encoding)) {

                case 'b':

                    $text = base64_decode($text);

                    break;

                case 'q':

                    $text = str_replace('_', ' ', $text);

                    preg_match_all('/=([a-f0-9]{2})/i', $text, $matches);

                    foreach($matches[1] as $value)

                        $text = str_replace('='.$value, chr(hexdec($value)), $text);

                    break;

            }

            $input = str_replace($encoded, $text, $input);

        }

        return $input;

    }

    /**

     * Given a body string and an encoding type,

     * this function will decode and return it.

     *

     * @param  string Input body to decode

     * @param  string Encoding type to use.

     * @return string Decoded body

     * @access private

     */

    function _decodeBody($input, $encoding = '7bit')

    {

        switch (strtolower($encoding)) {

            case '7bit':

                return $input;

                break;

            case 'quoted-printable':

                return $this->_quotedPrintableDecode($input);

                break;

            case 'base64':

                return base64_decode($input);

                break;

            default:

                return $input;

        }

    }

    /**

     * Given a quoted-printable string, this

     * function will decode and return it.

     *

     * @param  string Input body to decode

     * @return string Decoded body

     * @access private

     */

    function _quotedPrintableDecode($input)

    {

        // Remove soft line breaks

        $input = preg_replace("/=\r?\n/", '', $input);

        // Replace encoded characters

		$input = preg_replace('/=([a-f0-9]{2})/ie', "chr(hexdec('\\1'))", $input);

        return $input;

    }

    /**

     * Checks the input for uuencoded files and returns

     * an array of them. Can be called statically, eg:

     *

     * $files =& Mail_mimeDecode::uudecode($some_text);

     *

     * It will check for the begin 666 ... end syntax

     * however and won't just blindly decode whatever you

     * pass it.

     *

     * @param  string Input body to look for attahcments in

     * @return array  Decoded bodies, filenames and permissions

     * @access public

     * @author Unknown

     */

    function &uudecode($input)

    {

        // Find all uuencoded sections

        preg_match_all("/begin ([0-7]{3}) (.+)\r?\n(.+)\r?\nend/Us", $input, $matches);

        for ($j = 0; $j < count($matches[3]); $j++) {

            $str      = $matches[3][$j];

            $filename = $matches[2][$j];

            $fileperm = $matches[1][$j];

            $file = '';

            $str = preg_split("/\r?\n/", trim($str));

            $strlen = count($str);

            for ($i = 0; $i < $strlen; $i++) {

                $pos = 1;

                $d = 0;

                $len=(int)(((ord(substr($str[$i],0,1)) -32) - ' ') & 077);

                while (($d + 3 <= $len) AND ($pos + 4 <= strlen($str[$i]))) {

                    $c0 = (ord(substr($str[$i],$pos,1)) ^ 0x20);

                    $c1 = (ord(substr($str[$i],$pos+1,1)) ^ 0x20);

                    $c2 = (ord(substr($str[$i],$pos+2,1)) ^ 0x20);

                    $c3 = (ord(substr($str[$i],$pos+3,1)) ^ 0x20);

                    $file .= chr(((($c0 - ' ') & 077) << 2) | ((($c1 - ' ') & 077) >> 4));

                    $file .= chr(((($c1 - ' ') & 077) << 4) | ((($c2 - ' ') & 077) >> 2));

                    $file .= chr(((($c2 - ' ') & 077) << 6) |  (($c3 - ' ') & 077));

                    $pos += 4;

                    $d += 3;

                }

                if (($d + 2 <= $len) && ($pos + 3 <= strlen($str[$i]))) {

                    $c0 = (ord(substr($str[$i],$pos,1)) ^ 0x20);

                    $c1 = (ord(substr($str[$i],$pos+1,1)) ^ 0x20);

                    $c2 = (ord(substr($str[$i],$pos+2,1)) ^ 0x20);

                    $file .= chr(((($c0 - ' ') & 077) << 2) | ((($c1 - ' ') & 077) >> 4));

                    $file .= chr(((($c1 - ' ') & 077) << 4) | ((($c2 - ' ') & 077) >> 2));

                    $pos += 3;

                    $d += 2;

                }

                if (($d + 1 <= $len) && ($pos + 2 <= strlen($str[$i]))) {

                    $c0 = (ord(substr($str[$i],$pos,1)) ^ 0x20);

                    $c1 = (ord(substr($str[$i],$pos+1,1)) ^ 0x20);

                    $file .= chr(((($c0 - ' ') & 077) << 2) | ((($c1 - ' ') & 077) >> 4));

                }

            }

            $files[] = array('filename' => $filename, 'fileperm' => $fileperm, 'filedata' => $file);

        }

        return $files;

    }

    /**

     * getSendArray() returns the arguments required for Mail::send()

     * used to build the arguments for a mail::send() call

     *

     * Usage:

     * $mailtext = Full email (for example generated by a template)

     * $decoder = new Mail_mimeDecode($mailtext);

     * $parts =  $decoder->getSendArray();

     * if (!PEAR::isError($parts) {

     *     list($recipents,$headers,$body) = $parts;

     *     $mail = Mail::factory('smtp');

     *     $mail->send($recipents,$headers,$body);

     * } else {

     *     echo $parts->message;

     * }

     * @return mixed   array of recipeint, headers,body or Pear_Error

     * @access public

     * @author Alan Knowles <alan@akbkhome.com>

     */

    function getSendArray()

    {

        // prevent warning if this is not set

        $this->_decode_headers = FALSE;

        $headerlist =$this->_parseHeaders($this->_header);

        $to = "";

        if (!$headerlist) {

            return $this->raiseError("Message did not contain headers");

        }

        foreach($headerlist as $item) {

            $header[$item['name']] = $item['value'];

            switch (strtolower($item['name'])) {

                case "to":

                case "cc":

                case "bcc":

                    $to = ",".$item['value'];

                default:

                   break;

            }

        }

        if ($to == "") {

            return $this->raiseError("Message did not contain any recipents");

        }

        $to = substr($to,1);

        return array($to,$header,$this->_body);

    }

    /**

     * Returns a xml copy of the output of

     * Mail_mimeDecode::decode. Pass the output in as the

     * argument. This function can be called statically. Eg:

     *

     * $output = $obj->decode();

     * $xml    = Mail_mimeDecode::getXML($output);

     *

     * The DTD used for this should have been in the package. Or

     * alternatively you can get it from cvs, or here:

     * http://www.phpguru.org/xmail/xmail.dtd.

     *

     * @param  object Input to convert to xml. This should be the

     *                output of the Mail_mimeDecode::decode function

     * @return string XML version of input

     * @access public

     */

    function getXML($input)

    {

        $crlf    =  "\r\n";

        $output  = '<?xml version=\'1.0\'?>' . $crlf .

                   '<!DOCTYPE email SYSTEM "http://www.phpguru.org/xmail/xmail.dtd">' . $crlf .

                   '<email>' . $crlf .

                   Mail_mimeDecode::_getXML($input) .

                   '</email>';

        return $output;

    }

    /**

     * Function that does the actual conversion to xml. Does a single

     * mimepart at a time.

     *

     * @param  object  Input to convert to xml. This is a mimepart object.

     *                 It may or may not contain subparts.

     * @param  integer Number of tabs to indent

     * @return string  XML version of input

     * @access private

     */

    function _getXML($input, $indent = 1)

    {

        $htab    =  "\t";

        $crlf    =  "\r\n";

        $output  =  '';

        $headers = @(array)$input->headers;

        foreach ($headers as $hdr_name => $hdr_value) {

            // Multiple headers with this name

            if (is_array($headers[$hdr_name])) {

                for ($i = 0; $i < count($hdr_value); $i++) {

                    $output .= Mail_mimeDecode::_getXML_helper($hdr_name, $hdr_value[$i], $indent);

                }

            // Only one header of this sort

            } else {

                $output .= Mail_mimeDecode::_getXML_helper($hdr_name, $hdr_value, $indent);

            }

        }

        if (!empty($input->parts)) {

            for ($i = 0; $i < count($input->parts); $i++) {

                $output .= $crlf . str_repeat($htab, $indent) . '<mimepart>' . $crlf .

                           Mail_mimeDecode::_getXML($input->parts[$i], $indent+1) .

                           str_repeat($htab, $indent) . '</mimepart>' . $crlf;

            }

        } elseif (isset($input->body)) {

            $output .= $crlf . str_repeat($htab, $indent) . '<body><![CDATA[' .

                       $input->body . ']]></body>' . $crlf;

        }

        return $output;

    }

    /**

     * Helper function to _getXML(). Returns xml of a header.

     *

     * @param  string  Name of header

     * @param  string  Value of header

     * @param  integer Number of tabs to indent

     * @return string  XML version of input

     * @access private

     */

    function _getXML_helper($hdr_name, $hdr_value, $indent)

    {

        $htab   = "\t";

        $crlf   = "\r\n";

        $return = '';

        $new_hdr_value = ($hdr_name != 'received') ? Mail_mimeDecode::_parseHeaderValue($hdr_value) : array('value' => $hdr_value);

        $new_hdr_name  = str_replace(' ', '-', ucwords(str_replace('-', ' ', $hdr_name)));

        // Sort out any parameters

        if (!empty($new_hdr_value['other'])) {

            foreach ($new_hdr_value['other'] as $paramname => $paramvalue) {

                $params[] = str_repeat($htab, $indent) . $htab . '<parameter>' . $crlf .

                            str_repeat($htab, $indent) . $htab . $htab . '<paramname>' . htmlspecialchars($paramname) . '</paramname>' . $crlf .

                            str_repeat($htab, $indent) . $htab . $htab . '<paramvalue>' . htmlspecialchars($paramvalue) . '</paramvalue>' . $crlf .

                            str_repeat($htab, $indent) . $htab . '</parameter>' . $crlf;

            }

            $params = implode('', $params);

        } else {

            $params = '';

        }

        $return = str_repeat($htab, $indent) . '<header>' . $crlf .

                  str_repeat($htab, $indent) . $htab . '<headername>' . htmlspecialchars($new_hdr_name) . '</headername>' . $crlf .

                  str_repeat($htab, $indent) . $htab . '<headervalue>' . htmlspecialchars($new_hdr_value['value']) . '</headervalue>' . $crlf .

                  $params .

                  str_repeat($htab, $indent) . '</header>' . $crlf;

        return $return;

    }

} // End of class

?>