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();
}
}
}
// public static void write(OutputStream stream, Element element, int hashLength) throws
// XMLStreamException {
// XMLOutputFactory xof = XMLOutputFactory.newInstance();
// IndentingXMLStreamWriter xtw = new
// IndentingXMLStreamWriter(xof.createXMLStreamWriter(stream));
// writeXMLStreamWriter(xtw, element, hashLength);
// }
//
private static void writeXMLStreamWriter(XMLStreamWriter xtw, Element element, int hashLength)
throws XMLStreamException {
if (hashLength > 0) {
String hash = element.getHash(hashLength);
Element hashElement = new Element(CRC_ELEMENT);
hashElement.setText(hash);
element.addChild(hashElement);
}
writeElement(xtw, element);
xtw.writeEndDocument();
xtw.flush();
xtw.close();
if (hashLength > 0) {
element.removeChildren(CRC_ELEMENT);
}
}