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fog.c
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fog.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#define PORT_NUMBER 65432
#define BUFFER_SIZE 1048576
#define MAX_BYTES 256
typedef unsigned char byte;
typedef long long ll;
ll frequency[MAX_BYTES] = {0};
char paths[MAX_BYTES][17];
typedef struct Node {
struct Node *next;
struct Node *left;
struct Node *right;
ll freq;
byte b;
} Node;
Node *create_node(byte b, ll f) {
Node *new_node = malloc(sizeof(Node));
new_node->freq = f;
new_node->left = NULL;
new_node->next = NULL;
new_node->right = NULL;
new_node->b = b;
return new_node;
}
void insert_in_list(Node **head, Node *node) {
if (*head == NULL || node->freq <= (*head)->freq) {
node->next = *head;
*head = node;
return;
}
Node *check;
for (check = *head; check->next != NULL; check = check->next) {
if (node->freq <= check->next->freq) {
node->next = check->next;
check->next = node;
return;
}
}
check->next = node;
}
void assemble_linked_list(Node **head) {
for (short i = 0; i < MAX_BYTES; i++) {
if (frequency[i] != 0) {
insert_in_list(head, create_node(i, frequency[i]));
}
}
}
void print_list(Node *node) {
for (; node != NULL; node = node->next) {
printf("freq: %lld, byte: %d\n", node->freq, node->b);
}
}
Node *pop(Node **head) {
if (*head == NULL) return NULL;
Node *result = *head;
*head = result->next;
return result;
}
byte is_leaf(Node *node) {
return (node->left == NULL && node->right == NULL);
}
void print_tree(Node *node) {
if (node == NULL) return;
if ((node->b == (byte)'*' || node->b == (byte)'\\') && is_leaf(node)) {
printf("\\");
}
printf("%c", node->b);
print_tree(node->left);
print_tree(node->right);
}
void assemble_huffman_tree(Node **root) {
byte ran_once = 0;
while (!ran_once || (*root)->next != NULL) {
Node *left = pop(root);
Node *right = pop(root);
ll freq = (left == NULL ? 0 : left->freq) + (right == NULL ? 0 : right->freq);
Node *parent = create_node((byte)'*', freq);
parent->left = left;
parent->right = right;
insert_in_list(root, parent);
ran_once = 1;
}
}
void map_byte_paths(Node *node, char str[], byte len) {
if (node == NULL) return;
if (is_leaf(node)) {
strcpy(paths[node->b], str);
}
else {
char left_str[len + 1];
char right_str[len + 1];
strcpy(left_str, str);
strcpy(right_str, str);
strcat(left_str, "0");
strcat(right_str, "1");
map_byte_paths(node->left, left_str, len + 1);
map_byte_paths(node->right, right_str, len + 1);
}
}
void free_tree(Node *node) {
if (node == NULL) return;
free_tree(node->left);
free_tree(node->right);
free(node);
}
int get_tree_size(Node *node) {
if (node == NULL) return 0;
return 1 +
(is_leaf(node) && (node->b == (byte)'*' || node->b == (byte)'\\')) +
get_tree_size(node->left) +
get_tree_size(node->right);
}
void calculate_first_two_bytes(Node *root, byte *first_byte, byte *second_byte, ll total_bits) {
byte trash_bits = (8 - (total_bits % 8)) % 8;
int tree_size = get_tree_size(root);
*first_byte = (trash_bits << 5);
*first_byte = *first_byte | (byte)((tree_size >> 8) & 0b00011111);
*second_byte = (byte)tree_size;
}
void write_tree(Node *node, byte str[], short *aux) {
if (node == NULL) return;
if (is_leaf(node) && (node->b == (byte)'*' || node->b == (byte)'\\')) {
str[(*aux)++] = '\\';
}
str[(*aux)++] = node->b;
write_tree(node->left, str, aux);
write_tree(node->right, str, aux);
}
ll get_compacted_message_bits() {
ll result = 0;
for (short i = 0; i < MAX_BYTES; i++) {
if (frequency[i] == 0) continue;
result += frequency[i] * strlen(paths[i]);
}
return result;
}
void get_compacted_message_str(byte compacted[], byte buffer[], ll initial, ll len) {
byte b = 0;
char j = 7;
ll i_compacted = initial;
for (ll i = 0; i < len; i++) {
char *path = paths[buffer[i]];
for (byte i_path = 0; path[i_path] != '\0'; i_path++) {
if (path[i_path] == '1') b = b | (1 << j);
j--;
if (j < 0) {
compacted[i_compacted++] = b;
b = 0;
j = 7;
}
}
}
if (j != 7) compacted[i_compacted] = b;
}
void write_content_size(byte content[], ll content_size) {
int t = content_size;
for (short i = 6; i >= 0; i--) {
content[i] = (byte)(t % 10);
t /= 10;
}
}
void send_to_cloud(byte content[], ll content_len) {
int sockfd;
struct sockaddr_in server_address;
char buffer[BUFFER_SIZE];
// Create socket
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd == -1) {
perror("Error creating socket");
exit(EXIT_FAILURE);
}
// Set up the server address
memset(&server_address, 0, sizeof(server_address));
server_address.sin_family = AF_INET;
server_address.sin_port = htons(PORT_NUMBER);
server_address.sin_addr.s_addr = INADDR_ANY;
// Connect to the server
if (connect(sockfd, (struct sockaddr*)&server_address, sizeof(server_address)) == -1) {
perror("Error connecting to the server");
close(sockfd);
exit(EXIT_FAILURE);
}
// Send a message to the server
// printf("sending %d bytes\n", content_len);
for (ll i = 0 ; i < content_len; i++) {
content[i] = (content[i] ^ 0b11111111);
printf("%c", content[i]);
}
printf("\nnumber of bytes sent: %d\n", content_len);
send(sockfd, content, content_len, 0);
// Close the socket
close(sockfd);
}
void compress_file_and_send(byte buffer[], ll file_len) {
Node *head = NULL;
for (ll i = 0; i < file_len; i++) {
frequency[buffer[i]]++;
}
assemble_linked_list(&head);
assemble_huffman_tree(&head);
map_byte_paths(head, "", 1);
byte first_byte, second_byte;
ll compacted_message_bits = get_compacted_message_bits();
short tree_size = get_tree_size(head);
calculate_first_two_bytes(head, &first_byte, &second_byte, compacted_message_bits);
byte huffman_tree[tree_size];
short aux = 0;
write_tree(head, huffman_tree, &aux);
ll total_size = compacted_message_bits / 8 + (compacted_message_bits % 8 != 0) + 2 + tree_size + 7;
byte compacted_file[total_size];
ll initial;
write_content_size(compacted_file, total_size);
compacted_file[7] = first_byte;
compacted_file[8] = second_byte;
for (initial = 9; initial < 2 + 7 + tree_size; initial++) {
compacted_file[initial] = huffman_tree[initial - 2 - 7];
}
get_compacted_message_str(compacted_file, buffer, initial, file_len);
free_tree(head);
memset(frequency, 0, MAX_BYTES * sizeof(ll));
for (short i = 0; i < MAX_BYTES; i++) {
memset(paths[i], 0, 17);
}
send_to_cloud(compacted_file, total_size);
}
int listen_to_iot() {
const int SERVER_PORT = 65431;
const char* SERVER_IP = "localhost";
// Create a socket
int server_socket = socket(AF_INET, SOCK_STREAM, 0);
if (server_socket == -1) {
perror("Socket creation failed");
return 1;
}
// Bind the socket to a specific address and port
struct sockaddr_in server_address;
server_address.sin_family = AF_INET;
server_address.sin_port = htons(SERVER_PORT);
server_address.sin_addr.s_addr = INADDR_ANY;
if (bind(server_socket, (struct sockaddr*)&server_address, sizeof(server_address)) == -1) {
perror("Bind failed");
close(server_socket);
return 1;
}
// Listen for incoming connections
if (listen(server_socket, 5) == -1) {
perror("Listen failed");
close(server_socket);
return 1;
}
printf("Server listening on %s:%d\n", SERVER_IP, SERVER_PORT);
while (1) {
// Accept a client connection
struct sockaddr_in client_address;
socklen_t client_address_length = sizeof(client_address);
int client_socket = accept(server_socket, (struct sockaddr*)&client_address, &client_address_length);
if (client_socket == -1) {
perror("Accept failed");
continue;
}
byte buffer[BUFFER_SIZE] = {0};
ll total_bytes_received = 0;
while (1) {
ssize_t bytes_received = recv(client_socket, buffer + total_bytes_received, sizeof(buffer), 0);
if (bytes_received <= 0) {
break;
} else {
total_bytes_received += bytes_received;
}
}
compress_file_and_send(buffer, total_bytes_received);
// Close the client socket
close(client_socket);
}
// Close the server socket
close(server_socket);
}
int main() {
listen_to_iot();
return 0;
}