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<?php |
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/** |
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* This file is part of the ZBateson\MailMimeParser project. |
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* |
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* Idea taken from HHVM's ConvertFilter and coded to avoid requiring a |
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* different license and because I don't want to deal with legalities. |
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* |
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* Unfortunately the HHVM version seems to fail for larger base64-encoded files |
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* (both encoding and decoding). Once the stream needs to be buffered, if it |
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* isn't buffered on a 3-byte chunk for encoding, or 4 byte-chunk for decoding, |
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* it won't make sense. Currently it is only used for quoted-printable encoding |
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* and decoding. |
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* |
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* @license http://opensource.org/licenses/bsd-license.php BSD |
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*/ |
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namespace ZBateson\MailMimeParser\Stream; |
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use php_user_filter; |
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class ConvertStreamFilter extends php_user_filter |
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{ |
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/** |
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* Name used when registering with stream_filter_register. |
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*/ |
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const STREAM_FILTER_NAME = 'mmp-convert.*'; |
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/** |
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* @var string Leftovers from the last incomplete line that was parsed, to |
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* be prepended to the next line read. |
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*/ |
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private $leftover = ''; |
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/** |
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* @var string function to call for encoding/decoding |
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*/ |
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private $fnFilterName; |
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/** |
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* Sets up which function should be called. |
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* |
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* @return bool |
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*/ |
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public function onCreate() |
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{ |
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// strip off 'mmp-convert.' |
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$name = substr($this->filtername, 12); |
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$aFilters = [ |
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'quoted-printable-encode' => true, |
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'quoted-printable-decode' => true, |
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]; |
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if (!isset($aFilters[$name])) { |
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return false; |
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} |
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$this->fnFilterName = str_replace('-', '_', $name); |
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return true; |
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} |
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/** |
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* Sets up a remainder of read bytes if one of the last two bytes |
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* read is an '=' since quoted_printable_decode wouldn't work if one |
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* read operation ends with "=3" and the next begins with "D" for |
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* example. |
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* |
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* @param string $data |
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*/ |
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private function getFilteredBucket($data) |
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{ |
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$ret = $this->leftover . $data; |
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if ($this->fnFilterName === 'quoted_printable_decode') { |
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$len = strlen($ret); |
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$eq = strrpos($ret, '='); |
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if (($eq !== false) && ($eq === $len - 1 || $eq === $len - 2)) { |
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1 |
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$this->leftover = substr($ret, $eq); |
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1 |
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$ret = substr($ret, 0, $eq); |
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} else { |
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$this->leftover = ''; |
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} |
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} |
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return $ret; |
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} |
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/** |
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* Filter implementation converts calls the relevant encode/decode filter |
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* and chunk_split if needed, before returning PSFS_PASS_ON. |
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* |
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* @param resource $in |
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* @param resource $out |
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* @param int $consumed |
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* @param bool $closing |
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* @return int |
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*/ |
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public function filter($in, $out, &$consumed, $closing) |
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{ |
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while ($bucket = stream_bucket_make_writeable($in)) { |
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$filtered = $this->getFilteredBucket($bucket->data); |
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$data = call_user_func($this->fnFilterName, $filtered); |
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stream_bucket_append($out, stream_bucket_new($this->stream, $data)); |
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} |
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return PSFS_PASS_ON; |
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} |
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} |
zbateson /
mail-mime-parser
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