/* Returns true if the message could be rendered. */
private boolean toWire(DNSOutput out, int maxLength) {
if (maxLength < Header.LENGTH) return false;
Header newheader = null;
int tempMaxLength = maxLength;
if (tsigkey != null) tempMaxLength -= tsigkey.recordLength();
int startpos = out.current();
header.toWire(out);
Compression c = new Compression();
for (int i = 0; i < 4; i++) {
int skipped;
if (sections[i] == null) continue;
skipped = sectionToWire(out, i, c, tempMaxLength);
if (skipped != 0) {
if (i != Section.ADDITIONAL) {
if (newheader == null) newheader = (Header) header.clone();
newheader.setFlag(Flags.TC);
int count = newheader.getCount(i);
newheader.setCount(i, count - skipped);
for (int j = i + 1; j < 4; j++) newheader.setCount(j, 0);
out.save();
out.jump(startpos);
newheader.toWire(out);
out.restore();
}
break;
}
}
if (tsigkey != null) {
TSIGRecord tsigrec = tsigkey.generate(this, out.toByteArray(), tsigerror, querytsig);
if (newheader == null) newheader = (Header) header.clone();
tsigrec.toWire(out, Section.ADDITIONAL, c);
newheader.incCount(Section.ADDITIONAL);
out.save();
out.jump(startpos);
newheader.toWire(out);
out.restore();
}
return true;
}
/**
* Creates a copy of this Message. This is done by the Resolver before adding TSIG and OPT
* records, for example.
*
* @see Resolver
* @see TSIGRecord
* @see OPTRecord
*/
public Object clone() {
Message m = new Message();
for (int i = 0; i < sections.length; i++) {
if (sections[i] != null) m.sections[i] = new LinkedList(sections[i]);
}
m.header = (Header) header.clone();
m.size = size;
return m;
}