Reliapack::Reliapack(char * data, int dataLength, int seqNum, Datapack *resp) {
numPackets = (dataLength + MAX_DATA_LENGTH - 1) /MAX_DATA_LENGTH;
numPackets = (numPackets == 0) ? 1 : numPackets; //can't have a length of 0
packets = new char *[numPackets];
lengths = new int[numPackets];
sequenceNum = seqNum;
int dataOffset = 0; //be careful with this variable
int bufLength = MAX_DATA_LENGTH + HEADER_LENGTH;
//this can be done to all packets
for(int i=0; i<numPackets; i++) {
if(i == (numPackets - 1)) //if this is the last packet, change the buffer length
bufLength = dataLength - dataOffset + HEADER_LENGTH;
int oldDataOffset = dataOffset;
//copy into buffer in DatagramPacket
packets[i] = new char[bufLength];
lengths[i] = bufLength;
for(int bufPlace=HEADER_LENGTH; bufPlace < bufLength; )
packets[i][bufPlace++] = data[dataOffset++];
setSeqNum(packets[i], seqNum);
setRetryNum(packets[i], 0);
setResponseSeqNum(packets[i], resp == 0 ? 0 : resp->getSequenceNumber());
setResponseRetryNum(packets[i], 0); //the retry number should only be set for ack packets
setOffset(packets[i], oldDataOffset);
setTotalLength(packets[i], dataLength);
}
memcpy(&address, resp->getAddress(), sizeof(struct sockaddr_in));
ftime(&lastEventTime);
}
enum event getEvent(ack_t* ack){
// int seq_num;
uint32_t seq_num;
// int buf_len;
uint32_t buf_len;
// long tot_bytes;
uint32_t tot_bytes;
// off_t offst;
uint32_t offst;
if (ack == NULL)
return INVALID_EVT;
if( timerEvent == TIMEOUT) {
timerEvent = INVALID_EVT;
return TIMEOUT;
}
else if(cWnd >= ssThresh)
{
return CNWD_GR_SSTHR;
}
else if(dupAckCount == 3)
{
pthread_mutex_lock(&m);
file_off_to_read = offset_just_seen;
pthread_mutex_unlock(&m);
setSeqNum(prev_ack.sequencenumber+1);
return DUPACKCNT_3;
}
else
{
seq_num = ntohl(ack->sequencenumber);
buf_len = ntohl(ack->buf_len);
offst = ntohl(ack->f_offset);
tot_bytes = ntohl(ack->tot_bytes);
if((prev_ack.sequencenumber == seq_num) &&
(prev_ack.tot_bytes == tot_bytes) &&
(prev_ack.f_offset == offst) &&
(prev_ack.buf_len == buf_len))
{
return DUPACK;
}
prev_ack.sequencenumber = seq_num;
prev_ack.buf_len = buf_len;
prev_ack.tot_bytes = tot_bytes;
prev_ack.f_offset = offst;
offset_just_seen = offst;
bytesReceivedByClient = tot_bytes;
reset_totalBytes();
return NEW_ACK;
}
return INVALID_EVT;
}
void FileStore::setNextTargetMsgSeqNum( int value ) throw ( IOException )
{
m_cache.setNextTargetMsgSeqNum( value );
setSeqNum();
}
void FileStore::incrNextTargetMsgSeqNum() throw ( IOException )
{
m_cache.incrNextTargetMsgSeqNum();
setSeqNum();
}
PushHistoryItem::PushHistoryItem(const QString &itemId, int seqNum)
{
setItemId(itemId);
setSeqNum(seqNum);
}
