public int readFragmentCount() throws DataFormatException {
int off = readBodyOffset() + 1;
if (readACKsIncluded()) {
int numACKs = _message[off] & 0xff;
off++;
off += 4 * numACKs;
}
if (readACKBitfieldsIncluded()) {
int numBitfields = _message[off] & 0xff;
off++;
for (int i = 0; i < numBitfields; i++) {
PacketACKBitfield bf = new PacketACKBitfield(off);
off += bf.getByteLength();
}
}
if (readExtendedDataIncluded()) {
int size = _message[off] & 0xff;
off++;
off += size;
}
return _message[off];
}
@Override
public String toString() {
StringBuilder buf = new StringBuilder(512);
long msAgo = _context.clock().now() - readTimestamp() * 1000;
buf.append("Data packet sent ").append(msAgo).append("ms ago ");
buf.append("IV ");
buf.append(
Base64.encode(_message, _payloadBeginOffset - UDPPacket.IV_SIZE, UDPPacket.IV_SIZE));
buf.append(" ");
int off = readBodyOffset() + 1;
if (readACKsIncluded()) {
int numACKs = _message[off] & 0xff;
off++;
buf.append("with ACKs for ");
for (int i = 0; i < numACKs; i++) {
buf.append(DataHelper.fromLong(_message, off, 4)).append(' ');
off += 4;
}
}
if (readACKBitfieldsIncluded()) {
int numBitfields = _message[off] & 0xff;
off++;
buf.append("with partial ACKs for ");
try {
for (int i = 0; i < numBitfields; i++) {
PacketACKBitfield bf = new PacketACKBitfield(off);
buf.append(bf.getMessageId()).append(' ');
off += bf.getByteLength();
}
} catch (DataFormatException dfe) {
buf.append("CORRUPT");
return buf.toString();
}
}
if (readExtendedDataIncluded()) {
int size = _message[off] & 0xff;
off++;
buf.append("with extended size of ");
buf.append(size);
buf.append(' ');
off += size;
}
int numFragments = _message[off] & 0xff;
off++;
buf.append("with fragmentCount of ");
buf.append(numFragments);
buf.append(' ');
for (int i = 0; i < numFragments; i++) {
buf.append("containing messageId ");
buf.append(DataHelper.fromLong(_message, off, 4));
off += 4;
int fragNum = (_message[off] & 0xFF) >>> 1;
boolean isLast = (_message[off] & 1) != 0;
off++;
buf.append(" frag# ").append(fragNum);
buf.append(" isLast? ").append(isLast);
buf.append(" info ").append(_message[off - 1]);
int size = ((int) DataHelper.fromLong(_message, off, 2)) & 0x3FFF;
off += 2;
buf.append(" with ").append(size).append(" bytes; ");
off += size;
}
return buf.toString();
}