// Constructors
BigInt::BigInt(const std::string& str)
{
int startPos = 0;
if (str.compare(0,1,"-") == 0) {
sign = NEGATIVE;
startPos = 1;
} else {
sign = POSITIVE;
}
for (unsigned int i=startPos; i < str.length(); ++i)
digits.push_front(ascii2Int(str[i]));
base = BASE;
}
void hostInitTransmit(hostState * hstate, char word[], char replymsg[]) {
if (hstate->sendBuffer.busy == 1) {
strcpy(replymsg, "Transmit Aborted: Currently Trasmitting");
return;
}
if (hstate->sendBuffer.valid == 0) {
strcpy(replymsg, "Transmit Aborted: No File to Transmit");
return;
}
char dest[1000];
int dstaddr;
findWord(dest, word, 2);
dstaddr = ascii2Int(dest);
hstate->sendBuffer.dstaddr = dstaddr;
hstate->sendBuffer.busy = 1;
hstate->sendBuffer.pos = 0;
strcpy(replymsg, "Transmit Started");
}
/*
* Main loop of the host node
*
* It polls the manager connection for any requests from
* the manager, and replies
*
* Then it polls any incoming links and downloads any
* incoming packets to its receive packet buffer
*
* Then it sleeps for 10 milliseconds
*
* Then back to the top of the loop
*
*/
void hostMain(hostState * hstate)
{
char buffer[1000]; /* The message from the manager */
char word[1000];
int value;
char replymsg[1000]; /* Reply message to be displayed at the manager */
packetBuffer tmpbuff;
int length = 0; /* Size of string in pipe */
while(1) {
/* Check if there is a command message from the manager */
length = hostCommandReceive(&(hstate->manLink),buffer);
if (length > 1) { /* Execute the manager's command */
findWord(word, buffer, 1);
if (strcmp(word, "SetNetAddr")==0) {
findWord(word, buffer, 2); /* Find net address */
value = ascii2Int(word); /* Convert it to integer */
hostSetNetAddr(hstate, value, replymsg);
hostReplySend(&(hstate->manLink),"DISPLAY",replymsg);
}
else if (strcmp(word, "SetMainDir")==0) {
findWord(word, buffer, 2); /* Find directory name */
hostSetMainDir(hstate, word, replymsg);
hostReplySend(&(hstate->manLink),"DISPLAY",replymsg);
}
else if (strcmp(word, "ClearRcvFlg")==0) {
hostClearRcvFlg(hstate, replymsg);
hostReplySend(&(hstate->manLink),"DISPLAY",replymsg);
}
else if (strcmp(word, "UploadPacket")==0) {
findWord(word, buffer, 2); /* Find file name */
hostUploadPacket(hstate, word, replymsg);
hostReplySend(&(hstate->manLink), "DISPLAY",replymsg);
}
else if (strcmp(word, "DownloadPacket")==0) {
findWord(word, buffer, 2); /* Find file name */
hostDownloadPacket(hstate, word, replymsg);
hostReplySend(&(hstate->manLink), "DISPLAY",replymsg);
}
else if (strcmp(word, "GetHostState")==0) {
hostGetHostState(hstate, &(hstate->manLink), replymsg);
hostReplySend(&(hstate->manLink), "GetHostStateAck",replymsg);
}
else if (strcmp(word, "TransmitPacket")==0) {
hostInitTransmit(hstate, buffer, replymsg);
hostReplySend(&(hstate->manLink), "DISPLAY",replymsg);
}
} /* end of if */
if (hstate->sendBuffer.busy == 1) {
hostTransmitPacket(hstate, replymsg);
}
/* Check if there is an incoming packet */
length = linkReceive(&(hstate->linkin), &tmpbuff);
/*
* If there is a packet and if the packet's destination address
* is the host's network address then store the packet in the
* receive packet buffer
*/
if (tmpbuff.dstaddr == hstate->netaddr && tmpbuff.valid == 1) {
/* if there is already something in the buffer; clear it */
if (tmpbuff.start == 1) {
memset(hstate->rcvBuffer.data, 0, sizeof(hstate->rcvBuffer.data));
hstate->rcvBuffer.length = 0;
hstate->rcvflag = 0;
}
strcat(hstate->rcvBuffer.data, tmpbuff.payload);
hstate->rcvBuffer.length += tmpbuff.length;
hstate->rcvBuffer.srcaddr = tmpbuff.srcaddr;
hstate->rcvBuffer.dstaddr = tmpbuff.dstaddr;
if (tmpbuff.end == 1) {
hstate->rcvflag = 1;
hstate->rcvBuffer.valid = 1;
}
}
/* The host goes to sleep for 10 ms */
usleep(TENMILLISEC);
} /* End of while loop */
}