#include <stdlib.h>
#include <stdio.h>
#include <zlib.h>

#define DATALENGTH 1024*1024*16

/* Will read upto 16M integers from a file.
 * This expects the file to contain a sequence of
 * ints starting at 0, (eg 0 1 2 3 ..) and flags an
 * error if any of the ints don't match the expected sequence.
 * This has been tested on compressed and uncompressed files
 * containing 1 to 16M ints.
 */
main(int argc, char *argv[]) {
  int i,n, error=0;
  int rdata[DATALENGTH];
  gzFile *fp;

  if (argc<2) {
    printf("You must supply a file name\n");
    exit(1);
  }

  if ((fp=gzopen(argv[1], "rb")) == NULL) {
    printf ("Couldn't open file for reading\n");
    exit(1);
  }
  n=gzread(fp, rdata, DATALENGTH*sizeof(int));
  printf("Read %d bytes, ie %d ints\n", n, n/sizeof(int));
  for (i=0; i<n/sizeof(int); i++) {
    if (i != rdata[i]) {
      error=1;
      printf("ERROR expected %d, but got %d\n", i, rdata[i]);
    }
  }
  gzclose(fp);
  if (error==0) 
    printf("There were no errors.\n");
}