mimedecode.php

有关Mimemai Mimemai

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

                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, $this->_crlf);
                    $return->parts[] = $obj->decode(array('include_bodies' => $this->_include_bodies));
                    unset($obj);
                    break;

                default:
                    $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 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)
    {

        $pos = strpos($input, $this->_crlf . $this->_crlf);
        if ($pos === false) {
            $this->_error = 'Could not split header and body';
            return false;
        }

        $header = substr($input, 0, $pos);
        $body   = substr($input, $pos+(2*strlen($this->_crlf)));

        return array($header, $body);
    }

    /**
     * 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('/' . $this->_crlf . "(\t| )/", ' ', $input);
            $headers = explode($this->_crlf, trim($input));
    
            foreach ($headers as $value) {
                $hdr_name = substr($value, 0, $pos = strpos($value, ':'));
                $hdr_value = substr($value, $pos+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) {
                preg_match_all('/(([[:alnum:]]+)="?([^"]*)"?\s?;?)+/i', $input, $matches);

                for ($i = 0; $i < count($matches[2]); $i++) {
                    $return['other'][strtolower($matches[2][$i])] = $matches[3][$i];
                }
            }
        } 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)
    {
        $tmp = explode('--'.$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)\?[^?]*\?=)( |' . "\t|" . $this->_crlf . ')+=\?/', '\1=?', $input);

        // For each encoded-word...
        while (preg_match('/(=\?([^?]+)\?(Q|B)\?([^?]*)\?=)/', $input, $matches)) {

            $encoded  = $matches[1];
            $charset  = $matches[2];
            $encoding = $matches[3];
            $text     = $matches[4];

            switch ($encoding) {
                case 'B':
                    $text = base64_decode($text);
                    break;

                case 'Q':
                    $text = str_replace('_', ' ', $text);
                    preg_match_all('/=([A-F0-9]{2})/', $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, $encoding = '7bit')
    {
        switch ($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
        if (preg_match_all('/=[A-Z0-9]{2}/', $input, $matches)) {
            $matches = array_unique($matches[0]);
            foreach ($matches as $value) {
                $input = str_replace($value, chr(hexdec(substr($value,1))), $input);
            }
        }

        return $input;
    }

} // End of class
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