91 lines
2.4 KiB
PHP
91 lines
2.4 KiB
PHP
<?php
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/**
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* Copyright 2014-2017 Horde LLC (http://www.horde.org/)
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*
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* See the enclosed file COPYING for license information (LGPL). If you
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* did not receive this file, see http://www.horde.org/licenses/lgpl21.
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*
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* @category Horde
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* @copyright 2014-2017 Horde LLC
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* @license http://www.horde.org/licenses/lgpl21 LGPL 2.1
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* @package Mime
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*/
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/**
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* Stream filter to determine whether body requires either binary or 8bit
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* encoding (RFC 2045 [6]).
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*
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* @author Michael Slusarz <slusarz@horde.org>
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* @category Horde
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* @copyright 2014-2017 Horde LLC
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* @license http://www.horde.org/licenses/lgpl21 LGPL 2.1
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* @package Mime
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* @since 2.6.0
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*/
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class Horde_Mime_Filter_Encoding extends php_user_filter
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{
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/**
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* Number of consecutive non-CR/LF characters.
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*
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* @var integer
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*/
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protected $_crlf = 0;
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/**
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* @see stream_filter_register()
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*/
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public function onCreate()
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{
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$this->params->body = false;
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return true;
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}
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/**
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* @see stream_filter_register()
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*/
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public function filter($in, $out, &$consumed, $closing)
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{
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while ($bucket = stream_bucket_make_writeable($in)) {
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if ($this->params->body !== 'binary') {
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$len = $bucket->datalen;
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$str = $bucket->data;
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for ($i = 0; $i < $len; ++$i) {
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$chr = ord($str[$i]);
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switch ($chr) {
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case 0:
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/* Only binary data can have NULLs. */
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$this->params->body = 'binary';
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break 2;
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case 10: // LF
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case 13: // CR
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$this->_crlf = 0;
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break;
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default:
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/* RFC 2045 [2.8]: 8bit data must be less than 998
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* characters in length. Otherwise, we are looking at
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* binary. */
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if (++$this->_crlf > 998) {
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$this->params->body = 'binary';
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break 2;
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} elseif ($chr > 127) {
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$this->params->body = '8bit';
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}
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break;
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}
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}
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}
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$consumed += $bucket->datalen;
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stream_bucket_append($out, $bucket);
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}
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return PSFS_PASS_ON;
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}
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}
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