#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdint.h>

// data via $1, output to STDOUT
// begin = 255 followed by 12 bytes  2*(4*i + 1*u) + PowerH:PowerL

int main (int argc, char* argv[])
{
  u_int8_t tmp = 0;
  u_int8_t buffer[12];
  u_int16_t power = 0;

  int infile_fd = -1;  
  if (argc > 1) {
    infile_fd = open(argv[1], O_RDONLY);
    if(infile_fd < 0) {
      perror("open error");
      return 1;
    }
  } else {
    infile_fd = STDIN_FILENO;
  }
  
  while (read(infile_fd, &tmp, 1) == 1) {
    if (tmp == 255) {
      if (read(infile_fd, &buffer, sizeof(buffer)) != sizeof(buffer)) {
        perror("read error:");
        return 2;
      }

      power = (buffer[10]<<8) + buffer[11];
      printf("%5d (", power);

      int i;
      for(i=0; i<10; i++)
        printf("%3d ", buffer[i]);

      power = (((u_int16_t)buffer[0] + (u_int16_t)buffer[1] + (u_int16_t)buffer[2] + (u_int16_t)buffer[3]) * (u_int16_t)buffer[4]) +
              (((u_int16_t)buffer[5] + (u_int16_t)buffer[6] + (u_int16_t)buffer[7] + (u_int16_t)buffer[8]) * (u_int16_t)buffer[9]);

      printf(")  -> %5d\r", power);
    }
  }
  printf("\n");

  return 0;
}