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netpong/serialization.c

88 lines
2.8 KiB
C

#include <stdint.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#ifdef __unix__
#include <arpa/inet.h>
#endif
#ifdef _WIN32
#include <winsock2.h>
#endif
#include "includes/serialization.h"
/* Takes in float values, casts them to uint16_t and creates a Serial_Data struct */
Serial_Data Serial_create_data(float pad_x, float pad_y, float ball_x, float ball_y, bool should_quit) {
Serial_Data data;
data.pad_x = (uint16_t)pad_x;
data.pad_y = (uint16_t)pad_y;
data.ball_x = (uint16_t)ball_x;
data.ball_y = (uint16_t)ball_y;
data.should_quit = should_quit;
return data;
}
/* Serializes a 'Data' struct into a byte array, converted to network-byte order */
uint8_t* Serial_serialize(Serial_Data data) {
/* Create a pointer that can fit the entire struct */
uint8_t* serialized = malloc(sizeof(Serial_Data) + 1);
uint8_t* pad_x_ptr;
uint8_t* pad_y_ptr;
uint8_t* ball_x_ptr;
uint8_t* ball_y_ptr;
uint8_t* should_quit_ptr;
memset(serialized, 0, sizeof(Serial_Data) + 1); // Zero out the memory
pad_x_ptr = serialized;
pad_y_ptr = pad_x_ptr + sizeof(uint16_t);
ball_x_ptr = pad_y_ptr + sizeof(uint16_t);
ball_y_ptr = ball_x_ptr + sizeof(uint16_t);
should_quit_ptr = ball_y_ptr + sizeof(uint16_t);
*((uint16_t *)pad_x_ptr) = data.pad_x;
*((uint16_t *)pad_x_ptr) = htons(*((uint16_t *)pad_x_ptr));
*((uint16_t *)pad_y_ptr) = data.pad_y;
*((uint16_t *)pad_y_ptr) = htons(*((uint16_t *)pad_y_ptr));
*((uint16_t *)ball_x_ptr) = data.ball_x;
*((uint16_t *)ball_x_ptr) = htons(*((uint16_t *)ball_x_ptr));
*((uint16_t *)ball_y_ptr) = data.ball_y;
*((uint16_t *)ball_y_ptr) = htons(*((uint16_t *)ball_y_ptr));
*((bool *)should_quit_ptr) = data.should_quit;
*(should_quit_ptr + sizeof(bool)) = '\0';
return serialized;
}
/* Deserialize a byte array into a 'Data' struct, converted to host byte order */
Serial_Data Serial_deserialize(uint8_t* serialized) {
Serial_Data deserialized;
/* Use successive chunks of memory address to create pointers to the data */
uint8_t* pad_x_ptr = serialized;
uint8_t* pad_y_ptr = serialized + sizeof(uint16_t);
uint8_t* ball_x_ptr = pad_y_ptr + sizeof(uint16_t);
uint8_t* ball_y_ptr = ball_x_ptr + sizeof(uint16_t);
uint8_t* should_quit_ptr = ball_y_ptr + sizeof(uint16_t);
/* Dereference (and cast) the pointers, and store them into the struct */
deserialized.pad_x = *((uint16_t *)pad_x_ptr);
deserialized.pad_x = ntohs(deserialized.pad_x);
deserialized.pad_y = *((uint16_t *)pad_y_ptr);
deserialized.pad_y = ntohs(deserialized.pad_y);
deserialized.ball_x = *((uint16_t *)ball_x_ptr);
deserialized.ball_x = ntohs(deserialized.ball_x);
deserialized.ball_y = *((uint16_t *)ball_y_ptr);
deserialized.ball_y = ntohs(deserialized.ball_y);
deserialized.should_quit = *((bool *)should_quit_ptr);
return deserialized;
}