#include <stdio.h>#include <stdlib.h>#include "ac.h"/* Use random() and srandom() if you have them (Unix-like systems do). */#define RANDOM random#define SRANDOM srandom/* Otherwise, use rand() and srand() from the standard C library. *//* rand() is not very random, but will do for the demonstration here. *//* #define RANDOM rand *//* #define SRANDOM srand *//* Do not change these to rand and srand, they are declared in stdlib.h. *//* If the system declares these in a header, these two lines can be removed. */long random ();void srandom (unsigned);#define NUMLOOPS 10000#define ADAPT 1#define FILE1 "foo"#define FILE2 "bar"#define MASK1 ((0x1<<3) - 1)#define MASK2 ((0x1<<5) - 1)#define NSYM1 (MASK1 + 1)#define NSYM2 (MASK2 + 1)intmain (){  ac_encoder ace1;  ac_encoder ace2;  ac_decoder acd1;  ac_decoder acd2;  ac_model acm1;  ac_model acm2;  int sym, i;  ac_encoder_init (&ace1, FILE1);  ac_encoder_init (&ace2, FILE2);  ac_model_init (&acm1, NSYM1, NULL, ADAPT);  ac_model_init (&acm2, NSYM2, NULL, ADAPT);  SRANDOM (0);  for (i=0; i<NUMLOOPS; i++)  {    sym = (RANDOM() & MASK1);    ac_encode_symbol (&ace1, &acm1, sym);    sym = (RANDOM() & MASK2);    ac_encode_symbol (&ace1, &acm2, sym);    sym = (RANDOM() & MASK1);    ac_encode_symbol (&ace2, &acm1, sym);    sym = (RANDOM() & MASK2);    ac_encode_symbol (&ace2, &acm2, sym);  }  ac_encoder_done (&ace1);  ac_encoder_done (&ace2);  ac_model_done (&acm1);  ac_model_done (&acm2);  printf ("bits for encoder 1: %d\n", (int) ac_encoder_bits (&ace1));  printf ("bits for encoder 2: %d\n", (int) ac_encoder_bits (&ace2));  ac_decoder_init (&acd1, FILE1);  ac_decoder_init (&acd2, FILE2);  ac_model_init (&acm1, NSYM1, NULL, ADAPT);  ac_model_init (&acm2, NSYM2, NULL, ADAPT);  SRANDOM (0);  for (i=0; i<NUMLOOPS; i++)  {    sym = ac_decode_symbol (&acd1, &acm1);    if (sym != (RANDOM() & MASK1))  {      printf ("decoding error\n");      exit (1);    }    sym = ac_decode_symbol (&acd1, &acm2);    if (sym != (RANDOM() & MASK2))  {      printf ("decoding error\n");      exit (1);    }    sym = ac_decode_symbol (&acd2, &acm1);    if (sym != (RANDOM() & MASK1))  {      printf ("decoding error\n");      exit (1);    }    sym = ac_decode_symbol (&acd2, &acm2);    if (sym != (RANDOM() & MASK2))  {      printf ("decoding error\n");      exit (1);    }  }  ac_decoder_done (&acd1);  ac_decoder_done (&acd2);  ac_model_done (&acm1);  ac_model_done (&acm2);  return 0;}