public void toByteBuffer(ByteBuffer buf) {
// Source Port
buf.put((byte) ((sourceEP.getEonPort() & 0xFF00) >> 8));
buf.put((byte) (sourceEP.getEonPort() & 0xFF));
// Destination Port
buf.put((byte) ((destEP.getEonPort() & 0xFF00) >> 8));
buf.put((byte) (destEP.getEonPort() & 0xFF));
// Protocol
buf.put((byte) 0x2); // S-EON is protocol 2
// Flags
int flagsAndSack = 0;
if (ack) flagsAndSack += 0x80;
if (rst) flagsAndSack += 0x40;
if (syn) flagsAndSack += 0x20;
if (fin) flagsAndSack += 0x10;
// Number of sack regions goes in bits 4-5 of byte 5
int numSackRegions = (sackBegins == null) ? 0 : sackBegins.length;
if (numSackRegions > MAX_SACK_BLOCKS) numSackRegions = MAX_SACK_BLOCKS;
if (numSackRegions > 0) flagsAndSack += ((numSackRegions & 0x3) << 2);
buf.put((byte) flagsAndSack);
// Sequence Number
buf.put((byte) ((seqNum >> 24) & 0xFF));
buf.put((byte) ((seqNum >> 16) & 0xFF));
buf.put((byte) ((seqNum >> 8) & 0xFF));
buf.put((byte) ((seqNum) & 0xFF));
// Ack Number
buf.put((byte) ((ackNum >> 24) & 0xFF));
buf.put((byte) ((ackNum >> 16) & 0xFF));
buf.put((byte) ((ackNum >> 8) & 0xFF));
buf.put((byte) ((ackNum) & 0xFF));
// Sack blocks
for (int i = 0; i < numSackRegions; i++) {
long begin = sackBegins[i];
buf.put((byte) ((begin >> 24) & 0xFF));
buf.put((byte) ((begin >> 16) & 0xFF));
buf.put((byte) ((begin >> 8) & 0xFF));
buf.put((byte) ((begin) & 0xFF));
long end = sackEnds[i];
buf.put((byte) ((end >> 24) & 0xFF));
buf.put((byte) ((end >> 16) & 0xFF));
buf.put((byte) ((end >> 8) & 0xFF));
buf.put((byte) ((end) & 0xFF));
}
// Packet payload
if (payload != null) {
payload.position(0);
buf.put(payload);
}
}
public String toString() {
StringBuffer sb = new StringBuffer();
sb.append("SEONPacket: ");
sb.append("Source ")
.append(sourceEP.toString())
.append(", Dest ")
.append(destEP.toString())
.append(" ");
sb.append("SN ")
.append(String.valueOf(seqNum))
.append(" AN ")
.append(String.valueOf(ackNum))
.append(" ");
if (isSYN()) {
sb.append("SYN ");
}
if (isACK()) {
sb.append("ACK ");
}
if (isRST()) {
sb.append("RST ");
}
if (isFIN()) {
sb.append("FIN ");
}
if (payload != null && payload.limit() > 0) {
sb.append(payload.limit()).append(" bytes data");
} else {
sb.append("no data");
}
if (sackBegins != null && sackBegins.length > 0) {
sb.append(" SACK[");
for (int i = 0; i < sackBegins.length; i++) {
if (i > 0) sb.append(":");
sb.append(sackBegins[i]).append(",").append(sackEnds[i]);
}
sb.append("]");
}
return sb.toString();
}
