Decoding Quoted-Printable MIME attachment corrupted zip file

[mcfloyd]

Hello,

  I'm having a huge issue right now decoding a zip file from an attachment with a content-encoding of quoted-printable.  I have tried a couple different methods (such as decoding the entire attachment or decoding it line by line), but none have produced a valid file when saved.  What I don't understand is that I can download and open the file in Outlook fine, so there must be something wrong with the decoder.  Here is a code snippet of my recent attempt:

                            elseif ($transferEncoding == 'quoted-printable'){
                                $fileError = true;
                                $attachmentParts = explode("\n", $currentPart->getContent());
                                $attachmentArray = array();
                                foreach ($attachmentParts as $line){
                                    array_push($attachmentArray, quoted_printable_decode($line));
                                }
                                $attachment = implode("", $attachmentArray);
                                file_put_contents($unzipPath . '.zip', $attachment);
                            }
                            $unzipper = new Decompress(array(
                                'adapter' => 'Zip',
                                'options' => array(
                                    'target' => $unzipPath,
                                )
                            ));
                            $unzipper->filter($unzipPath . '.zip');
                            unlink($unzipPath . '.zip');

I'm using Zend Framework 2 methods for unzipping the file when it's done, but there is a CRC error because the file is getting corrupted during the decode.

 

This is how the file compares to the original (using Beyond Compare 3):

 

So it is finding the hex for CLRF and removing it from the file.

 

Any ideas on this would be greatly appreciated as I have been trying to solve this for about a month now.

 

Thanks,

-mcfloyd

[requinix]

$attachmentParts = explode("\n", $currentPart->getContent());

will cause problems if the newline is a \r\n. Try

$attachmentParts = preg_split('/\r\n?|\n/', $currentPart->getContent());