<?php
 
    /**这个是改自pear中的解码类，增加了多种解码方式，修正了源码的系列bug.将解出的邮件分正文和附件存储，提高了解码效率。
    * Mime decode class
    *
    * this class used at undecode Mime Files
    * useage:
    *
    *    $message=GetMessage($filename,$read_type,$read_size);    
    *    $structure=RdMail($message);
    *    $from=$structure->headers['from'];
    *    $to=$structure->headers['to'];
    *
    * @copyright (c) 2004, richard,bjcctv. All rights reserved.
    * @author richard,bjcctv
    * @date:2004-11-24 last modified at:2005-06-01
    * @package MimeDecode
    * @version $Id$
    */
 
class Decode_Mimemail
{
 
    /**
     * Mime File
     * @var    string
     */
    var $_input;
 
    /**
     * header string
     * @var    string
     */
    var $_header;
 
    /**
     * body string
     * @var    string
     */
    var $_body;
 
    /**
     * err info
     * @var    string
     */
    var $_error;
 
    /**
     * whether include body object
     * @var    boolean
     */
    var $_include_bodies;
 
    /**
     * whether include body object
     * @var    boolean
     */
    var $_decode_bodies;
 
    /**
     * whether decode headers object
     * @var    boolean
     */
    var $_decode_headers;
 
    /**
     * crlf variable
     * @var    string
     */
    var $_crlf;
 
    /**
     * body parts
     * @var object
     */
    var $parts;
    var $mid;
    var $maildir;
 
    /**
     * 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 Decode_Mimemail($input, $mid, $maildir, $crlf = "\n")
    {
        $this->_crlf   = "\n";
        list($header, $body)    = $this->splitBodyHeader($input); //拆分信头和信体两块