Horde_Mime_Part::getBytes PHP Method

    public function getBytes($approx = false)
    {
        if ($this->getPrimaryType() == 'multipart') {
            if (isset($this->_bytes)) {
                return $this->_bytes;
            }
            $bytes = 0;
            foreach ($this as $part) {
                $bytes += $part->getBytes($approx);
            }
            return $bytes;
        }
        if ($this->_contents) {
            fseek($this->_contents, 0, SEEK_END);
            $bytes = ftell($this->_contents);
        } else {
            $bytes = $this->_bytes;
            /* Base64 transfer encoding is approx. 33% larger than original
             * data size (RFC 2045 [6.8]). */
            if ($approx && $this->_transferEncoding == 'base64') {
                $bytes *= 0.75;
            }
        }
        return intval($bytes);
    }

 public function testNullCharactersNotAllowedInMimeHeaderData()
 {
     $part = new Horde_Mime_Part();
     $part->setType("text/plain");
     $this->assertEquals('text/plain', $part->getType());
     $part->setDisposition("inline");
     $this->assertEquals('inline', $part->getDisposition());
     $part->setDispositionParameter('size', '123' . "" . '456');
     $this->assertEquals(123456, $part->getDispositionParameter('size'));
     $part->setDispositionParameter('foo', "foobar");
     $this->assertEquals('foobar', $part->getDispositionParameter('foo'));
     $part->setCharset("utf-8");
     $this->assertEquals('utf-8', $part->getCharset());
     $part->setName("foobar");
     $this->assertEquals('foobar', $part->getName());
     $this->assertEquals('foobar', $part->getDispositionParameter('filename'));
     $this->assertEquals('foobar', $part->getContentTypeParameter('name'));
     $part->setLanguage("en");
     $this->assertEquals(array('en'), $part->getLanguage());
     $part->setLanguage(array("en", "de"));
     $this->assertEquals(array('en', 'de'), $part->getLanguage());
     $part->setDuration('123' . "" . '456');
     $this->assertEquals(123456, $part->getDuration());
     $part->setBytes('123' . "" . '456');
     $this->assertEquals(123456, $part->getBytes());
     $part->setDescription("foobar");
     $this->assertEquals('foobar', $part->getDescription());
     $part->setContentTypeParameter('foo', "foobar");
     $this->assertEquals('foobar', $part->getContentTypeParameter('foo'));
     $part->setContentId("foobar");
     $this->assertEquals('foobar', $part->getContentId());
 }