typedef struct rif {
  // "lifV0001"
  // "rifV0001"
  char     magic_num[8]; // Big Endian. UTF-8 Encoded. 6C 69 66 56 30 30 30 31
  uint64_t width;        // Big Endian
  uint8_t  format;
  uint8_t  data[];
} rif_t;

#define RIF_MAGIC_LITTLE {'l', 'i', 'f', 'V', '0', '0', '0', '1'}
#define RIF_MAGIC_BIG    {'r', 'i', 'f', 'V', '0', '0', '0', '1'}

#define RIF_FORMAT_R8G8B8   0
#define RIF_FORMAT_R8G8B8A8 1

void write_rif_little(char* path, uint32_t width, uint32_t size, uint8_t format, void* data) {
#define IMG_SIZE 17 + size // 17 is the size of raw_img excluding the data field
  rif_t* img = malloc(IMG_SIZE);
  char magic[] = RIF_MAGIC_LITTLE;
  memcpy(((char*)img)+0, magic, 8);
  img->width = width;
  img->format = format;
  memcpy(((char*)img)+17, data, size);
  FILE* output_file = fopen(path, "w");
  fwrite(img, 1, IMG_SIZE, output_file);
  free(img);
}