int llwrite(int fd, char * buffer, int length) {
comporTramaI(TRANSMITTER, buffer, length);
stuffing(info->frameSend, &info->frameSendLength);
//printf("partes: %x, %x, %x, %x, %x, %x, %x, %x, %x \n", tramaI[0],tramaI[1],tramaI[2],tramaI[3],tramaI[4],tramaI[5],tramaI[6],tramaI[7],tramaI[8]);
transmitirFrame(info->frameSend, info->frameSendLength);
//printf("enviar frame I com sequenceNumber = %d \n", info->sequenceNumber);
info->tentativas = tentativas;
while(info->tentativas > 0) {
start_alarm();
info->frameTempLength = readFrame(info->frameTemp);
if (info->sequenceNumber == 1) {
if (verifyFrame(info->frameTemp, info->frameTempLength, "rr0")) {
//printf("recebeu rr corretamente \n");
stop_alarm();
info->tentativas = tentativas;
break;
}
else if (verifyFrame(info->frameTemp, info->frameTempLength, "rej0")) {
//printf("recebeu rej0\n");
transmitirFrame(info->frameSend, info->frameSendLength);
continue;
}
}
else if (info->sequenceNumber == 0) {
if (verifyFrame(info->frameTemp, info->frameTempLength, "rr1")) {
//printf("recebeu rr corretamente \n");
stop_alarm();
info->tentativas = tentativas;
break;
}
else if (verifyFrame(info->frameTemp, info->frameTempLength, "rej1")) {
//printf("recebeu rej1\n");
transmitirFrame(info->frameSend, info->frameSendLength);
continue;
}
}
}
if (info->tentativas == 0) {
printf("Número de tentativas chegou ao fim. \n");
exit(-1);
}
info->sequenceNumber = !info->sequenceNumber;
//printf("retornar llwrite\n");
return 1;
}
int llwrite(int fd, unsigned char * buffer, int length) {
unsigned char* stuffed;
unsigned char* frame;
int frame_size = create_info_frame(ns, buffer, length, &frame);
stuffed = malloc(length * 2);
int stuff_size = stuffing(frame, frame_size, &stuffed);
falhas = 0;
while (falhas < numRetransmissoes) {
timeout = 0;
int missing = stuff_size;
int num = 0;
while (missing > 0) {
num = write(fd, stuffed, missing);
if (textMode)
printf("Wrote %d bytes\n", num);
stuffed += num;
missing -= num;
}
stuffed -= stuff_size;
unsigned char* rr;
if (ns == 0)
create_control_frame(RR1, &rr);
else
create_control_frame(RR0, &rr);
alarm(timeoutTime);
if (controlStateMachine(fd, rr) == 0)
break;
}
if (falhas >= numRetransmissoes)
return -1;
if (ns == 0)
ns = 1;
else
ns = 0;
return frame_size;
}
void testStuffing() {
char test1[6];
int i;
test1[0] = 'A';
test1[1] = 'B';
test1[2] = LFC_FLAG;
test1[3] = 0x7D;
test1[4] = 'D';
test1[5] = '\0';
printf("Before stuffing:\n");
for(i = 0; i < strlen(test1); i++)
{
printf("%x\n", test1[i]);
}
char stuffed[8];
if(stuffing(test1, 6, stuffed))
printf("Stuffing completed!\n");
printf("After stuffing:\n");
for(i = 0; i < 8; i++)
{
printf("%x\n", stuffed[i]);
}
if(unstuffing(stuffed, 8, test1))
{
printf("Unstuffing success!\n");
}
for(i = 0; i < 6; i++)
{
printf("%x\n", test1[i]);
}
}
