fixing *rcvframe

Author: harryawk

src/receiver.cpp

@@ -209,7 +209,7 @@ static MESGB *rcvframe(int sockfd, QTYPE *q){
 // cek struktur frame
 
 if (c[0].soh != SOH || c[0].stx != STX || c[0].etx != ETX || c[0].msgno != msgno) {
-printf("kirim NAK\n");
+printf("kirim NAK header\n");
 exit(-3);
 }
 
@@ -220,16 +220,17 @@ static MESGB *rcvframe(int sockfd, QTYPE *q){
 checksumarr[1] = c[0].stx;
 checksumarr[2] = c[0].etx;
 checksumarr[3] = c[0].msgno;
-checksumarr[4] = c[0].data[0];
-unsigned int checksum = crc32(&checksumarr);
+checksumarr[4] = *(c[0].data);
+unsigned int checksum = crc32a(checksumarr);
 if (checksum != c[0].checksum) {
-printf("kirim NAK\n");
+printf("kirim NAK checksumarr\n");
 exit(-4);
 }
 
 // succeed, sendto(transmitter, ACK);
-
-int send_ack = sendto(sockfd, ACK, sizeof(ACK), 0, (struct sockaddr*)&cli_addr, clilen);
+int* ack_table;
+ack_table[0] = ACK;
+int send_ack = sendto(sockfd, ack_table, sizeof(ACK), 0, (struct sockaddr*)&cli_addr, clilen);
 if(send_ack < 0){ //error sending ACK character
 printf("Error send ACK: %d", send_ack);
 exit(-2);
@@ -238,8 +239,8 @@ static MESGB *rcvframe(int sockfd, QTYPE *q){
 // succeed reading character
 ////////////////////////////////////
 q->count++;
-q->data[q->rear] = c[0].data;
-cur.data = &(q->data[q->rear]);
+q->data[q->rear] = *(c[0].data);
+cur->data = &(q->data[q->rear]);
 q->rear++;
 if(q->rear == RXQSIZE) {
 q->rear = 0;