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application_layer.c
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application_layer.c
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#include "application_layer.h"
unsigned char* createControlPacket(int C, long FileSize, const char* filename, int* packetSize){
const int LenL1 = sizeof(FileSize);
const int LenL2 = strlen(filename);
int finalSize = LenL1 + LenL2 + 5;
*packetSize = finalSize;
unsigned char* ret = (unsigned char*)malloc(finalSize);
ret[0] = C;
ret[1] = 0;
ret[2] = LenL1;
for (unsigned char i = 0 ; i < LenL1 ; i++) {
ret[2+LenL1-i] = FileSize | 0x00;
FileSize >>= 8;
}
ret[LenL1+3] = 1;
ret[LenL1+4] = LenL2;
for (int i = 0; i < LenL2; i++){
ret[LenL1 + 5 + i] = filename[i];
}
return ret;
}
unsigned char* decodeControlPacket(unsigned char* packet, int size, unsigned long int* fileSize){
unsigned char fileSizeNBytes = packet[2];
unsigned char fileSizeAux[fileSizeNBytes];
memcpy(fileSizeAux, packet+3, fileSizeNBytes);
for(unsigned int i = 0; i < fileSizeNBytes; i++)
*fileSize |= (fileSizeAux[fileSizeNBytes-i-1] << (8*i));
unsigned char fileNameNBytes = packet[3+fileSizeNBytes+1];
unsigned char *name = (unsigned char*)malloc(fileNameNBytes);
memcpy(name, packet+3+fileSizeNBytes+2, fileNameNBytes);
return name;
}
unsigned char* createDataPacket(const unsigned char* packageContent, int packageContentSize, int* packetSize){
int LenL2 = packageContentSize / 256;
int LenL1 = packageContentSize % 256;
*packetSize = 3 + packageContentSize;
unsigned char* ret = (unsigned char*)malloc(*packetSize);
ret[0] = 1;
ret[1] = LenL2;
ret[2] = LenL1;
for (int i = 0; i < packageContentSize; i++){
ret[i + 3] = packageContent[i];
}
return ret;
}
void applicationLayerTransmiter(struct linkLayer* ll, const char *filename){
if (llopen(ll, TRANSMITER) == -1) return;
FILE* file = fopen(filename, "rb");
int begin = ftell(file);
fseek(file, 0, SEEK_END);
long FileSize = ftell(file);
fseek(file, begin, SEEK_SET);
int controlPacketLen;
unsigned char* controlPacket = createControlPacket(2, FileSize, filename, &controlPacketLen);
llwrite(ll, controlPacket, controlPacketLen);
char* data = (char *)malloc(FileSize);
fread(data, 1, FileSize, file);
long int RemainingBytes = FileSize;
while (RemainingBytes > 0){
int packageContentSize;
if (RemainingBytes > 100) packageContentSize = 100;
else packageContentSize = RemainingBytes;
unsigned char* packageContent = (unsigned char*) malloc(packageContentSize);
memcpy(packageContent, data, packageContentSize);
int packageSize;
unsigned char* packageToSend = createDataPacket(packageContent, packageContentSize, &packageSize);
int bytesSent = llwrite(ll, packageToSend, packageSize);
if (bytesSent < 0) return;
RemainingBytes -= packageContentSize;
data += packageContentSize;
free(packageContent);
}
controlPacket = createControlPacket(3, FileSize, filename, &controlPacketLen);
llwrite(ll, controlPacket, controlPacketLen);
llclose(ll, TRANSMITER);
fclose(file);
}
void applicationLayerReceiver(struct linkLayer* ll){
llopen(ll, RECEIVER);
unsigned char *packet = (unsigned char*)malloc(2000);
int size = llread(ll, packet);
//char* FileName = "teste.gif";
unsigned int long ControlFileSize;
unsigned char* FileName = decodeControlPacket(packet, size, &ControlFileSize);
FILE* File = fopen(FileName, "wb+");
int finish = FALSE;
unsigned long int practicalSize = 0;
while (!finish){
int packetSize = llread(ll, packet);
if (packetSize == -1) return;
if(packet[0] == 3) finish = TRUE;
else{
unsigned long int contentSize = packet[1] * 256 + packet[2];
practicalSize += contentSize;
printf("=======================Dados que chegaram ao application=========\n");
for (int i = 0; i < packetSize; i++){
printf("%d,", packet[i]);
}
printf("\n=======================Dados que chegaram ao application=========\n");
fwrite(&packet[3], sizeof(unsigned char), packetSize - 3, File);
}
}
printf("The practical Size is: %ld\n", practicalSize);
fclose(File);
llclose(ll, RECEIVER);
}
void applicationLayer(const char *serialPort, int mode, int baudRate,
int nTries, int timeout, const char *filename){
struct linkLayer* ll;
ll = (struct linkLayer*)malloc(sizeof(struct linkLayer));
strcpy(ll->port, serialPort);
ll->baudRate = baudRate;
ll->timeout = timeout;
ll->numTransmissions = nTries;
if (mode == RECEIVER){
printf("receiver\n");
applicationLayerReceiver(ll);
}
if (mode == TRANSMITER){
printf("transmiter\n");
applicationLayerTransmiter(ll, filename);
}
}