private static void checkCRC(Element element) throws CRCMismatchException {
Element CRCElement = element.getChild(CRC_ELEMENT);
if (CRCElement != null) {
String crc = CRCElement.getText();
// the length in bytes is the number of characters divided by 2
int crcLength = crc.length() / 2;
if (!crc.equals(element.getHash(crcLength, CRC_ELEMENT))) {
throw new CRCMismatchException();
}
}
}
private static void writeElement(XMLStreamWriter xtw, Element element) throws XMLStreamException {
xtw.writeStartElement(element.getName());
for (String attributeName : element.getAttributeNames()) {
xtw.writeAttribute(attributeName, element.getAttributeValue(attributeName));
}
if (element.hasText()) {
xtw.writeCharacters(element.getText());
} else {
for (Element child : element.getChildren()) {
writeElement(xtw, child);
}
}
xtw.writeEndElement();
}