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使用php的编码功能-mime.inc

<?php
// $Horde: horde/lib/MIME.php,v 1.63 2001/08/08 21:00:27 chuck Exp $

$mime_types =
array(
      
TYPETEXT => 'text', 'text' => TYPETEXT,
      
TYPEMULTIPART => 'multipart', 'multipart' => TYPEMULTIPART,
      
TYPEMESSAGE => 'message', 'message' => TYPEMESSAGE,
      
TYPEAPPLICATION => 'application', 'application' => TYPEAPPLICATION,
      
TYPEAUDIO => 'audio', 'audio' => TYPEAUDIO,
      
TYPEIMAGE => 'image', 'image' => TYPEIMAGE,
      
TYPEVIDEO => 'video', 'video' => TYPEVIDEO,
      
TYPEOTHER => 'unknown', 'unknown' => TYPEOTHER
      
);

$mime_encodings =
array(
      
ENC7BIT => '7bit', '7bit' => ENC7BIT,
      
ENC8BIT => '8bit', '8bit' => ENC8BIT,
      
ENCBINARY => 'binary', 'binary' => ENCBINARY,
      
ENCBASE64 => 'base64', 'base64' => ENCBASE64,
      
ENCQUOTEDPRINTABLE => 'quoted-printable', 'quoted-printable' => ENCQUOTEDPRINTABLE,
      
ENCOTHER => 'unknown', 'unknown' => ENCOTHER
      
);


/**
* The MIME:: class provides methods for dealing with MIME standards.
*
* @author  Chuck Hagenbuch <[email protected]>
* @version $Revision: 1.64 $
* @since   Horde 1.3
* @package horde.mime
*/
class MIME {
    
    
/**
     * Determine if a string contains 8-bit characters.
     * @access private
     *
     * @param string $string  The string to check.
     * @return boolean        true if it does, false if it doesn't.
     */
    
function is8bit($string)
    {
        if (
is_string($string)) {
            for (
$i = 0; $i < strlen($string); $i++) {
                if (
ord($string[$i]) >> 7)
                    return
true;
            }
            return
false;
        }
        return
false;
    }
    
    
/**
     * Encode a string containing non-ascii characters according to RFC 2047.
     *
     * @param string $text    The text to encode.
     * @param string $charset (optional) The character set of the text.
     * @param boolean $outer  Is this the final iteration?
     *
     * @return string The text, encoded only if it contains non-ascii characters.
     */
    
function encode($text, $charset = null, $outer = true)
    {
        if (
MIME::is8bit($text)) {
            if (((
strlen($text) * 3) + strlen($charset) + 7) > 76) {
                
$text = MIME::encode(substr($text, 0, (23 - strlen($charset))), $charset) . MIME::encode(substr($text, (23 - strlen($charset))), $charset, false);
            } else {
                
$text = "=?$charset?B?" . strtr(trim(base64_encode($text)), ' ', '_') . "?=\n\t";
            }
        }
        
        
// if this is the final iteration, take off any trailing
        // newline/tab chars.
        
if ($outer && (substr($text, -2) == "\n\t"))
            
$text = substr($text, 0, -2);
        
        return
$text;
    }
    
    
/**
     * Encode a string containing email addresses according to RFC 2047.
     *
     * This differs from MIME::encode() because it keeps email
     * addresses legal, only encoding the personal information.
     *
     * @param string $text      The email addresses to encode.
     * @param string $charset   (optional) The character set of the text.
     * @param string $defserver (optional) The default domain to append to mailboxes.
     *
     * @return string The text, encoded only if it contains non-ascii characters.
     */
    
function encodeAddress($text, $charset = null, $defserver = null)
    {
        include_once
'Mail/RFC822.php';
        
        
$addr_arr = Mail_RFC822::parseAddressList($text, $defserver, false, false);
        
$text = '';
        if (
is_array($addr_arr)) {
            foreach (
$addr_arr as $addr) {
                if (empty(
$addr->personal)) {
                    
$personal = '';
                } else {
                    if ((
substr($addr->personal, 0, 1) == '"') &&
                        (
substr($addr->personal, -1) == '"')) {
                        
$addr->personal = substr($addr->personal, 1, -1);
                    }
                    
$personal = MIME::encode($addr->personal, $charset);
                }
                if (
strlen($text) != 0) $text .= ', ';
                
// FIXME: dependency on imap module
                
$text .= MIME::trimEmailAddress(imap_rfc822_write_address($addr->mailbox, $addr->host, $personal));
            }
        }
        return
$text;
    }
    
    
/**
     * Decode an RFC 2047-encoded string.
     *
     * @param string $string The text to decode.
     * @return string        The decoded text, or the original string if it was not encoded.
     */
    
function decode($string)
    {
        
$pos = strpos($string, '=?');
        if (
$pos === false) {
            return
$string;
        }
        
        
// take out any spaces between multiple encoded words
        
$string = preg_replace('|\?=\s=\?|', '?==?', $string);
        
        
$preceding = substr($string, 0, $pos); // save any preceding text
        
        
$search = substr($string, $pos + 2, 75); // the mime header spec says this is the longest a single encoded word can be
        
$d1 = strpos($search, '?');
        if (!
is_int($d1)) {
            return
$string;
        }
        
        
$charset = substr($string, $pos + 2, $d1);
        
$search = substr($search, $d1 + 1);
        
        
$d2 = strpos($search, '?');
        if (!
is_int($d2)) {
            return
$string;
        }
        
        
$encoding = substr($search, 0, $d2);
        
$search = substr($search, $d2+1);
        
        
$end = strpos($search, '?=');
        if (!
is_int($end)) {
            return
$string;
        }
        
        
$encoded_text = substr($search, 0, $end);
        
$rest = substr($string, (strlen($preceding . $charset . $encoding . $encoded_text) + 6));
        
        switch (
$encoding) {
        case
'Q':
        case
'q':
            
$encoded_text = str_replace('_', '%20', $encoded_text);
            
$encoded_text = str_replace('=', '%', $encoded_text);
            
$decoded = urldecode($encoded_text);

            
/* Convert Cyrillic character sets. */
            
if (stristr($GLOBALS['registry']->getCharset(), 'windows-1251')) {
                if (
stristr($charset, 'koi8-r')) {
                    
$decoded = convert_cyr_string($decoded, 'k', 'w');
                }
            }
            if (
stristr($GLOBALS['registry']->getCharset(), 'koi8-r')) {
                if (
stristr($charset, 'windows-1251')) {
                    
$decoded = convert_cyr_string($decoded, 'w', 'k');
                }
            }
            
            break;
            
        case
'B':
        case
'b':
            
$decoded = urldecode(base64_decode($encoded_text));
            if (
stristr($GLOBALS['registry']->getCharset(), 'windows-1251')) {
                if (
stristr($charset, 'koi8-r')) {
                    
$decoded = convert_cyr_string($decoded, 'k', 'w');
                }
            }
            if (
stristr($GLOBALS['registry']->getCharset(), 'koi8-r')) {
                if (
stristr($charset, 'windows-1251')) {
                    
$decoded = convert_cyr_string($decoded, 'w', 'k');
                }
            }
            break;
            
        default:
            
$decoded = '=?' . $charset . '?' . $encoding . '?' . $encoded_text . '?=';
            break;
        }
        
        return
$preceding . $decoded . MIME::decode($rest);
    }
    
    
/**
     * If an email address has no personal information, get rid of any
     * angle brackets (<>) around it.
     *
     * @param string $address   The address to trim.
     * @return string           The trimmed address.
     */
    
function trimEmailAddress($address)
    {
        
$address = trim($address);
        if ((
substr($address, 0, 1) == '<') && (substr($address, -1) == '>')) {
            
$address = substr($address, 1, -1);
        }
        return
$address;
    }
    
}
?>