/* expand_mask.c -- read a world 2' imgfile bitmask and reverse all the bits.
	Looks like I got the slmask backwards, initially.  WHFS 24 Apr 97  */

#include <stdio.h>
#include <math.h>

#define MASKSIZE 8553600
#define OUTSIZE 68428800

unsigned char maskset[8] = { 128, 64, 32, 16, 8, 4, 2, 1};
unsigned char a[MASKSIZE];
unsigned char b[OUTSIZE];

main(argc, argv)
int	argc;
char	**argv;
{
	FILE	*fp;
	int	i;

	if (argc != 3 || (fp = fopen(argv[1], "r")) == NULL) {
		fprintf(stderr,"usage:  expand_mask <input.bin> <output.bin>\n");
		if (argc > 1) fprintf(stderr,"expand_mask:  ERROR.  Cannot open r %s\n", argv[1]);
		exit(-1);
	}
	if ((fread(a, 1, MASKSIZE, fp)) != MASKSIZE) {
		fprintf(stderr,"expand_mask:  ERROR during read of %s\n", argv[1]);
		exit(-1);
	}
	fclose(fp);

	for (i = 0; i < OUTSIZE; i++) {
          b[i] = 0;
          if((a[i/8] & maskset[i%8]) > 0) b[i] = 1;
        }

	if ( (fp = fopen(argv[2], "w")) == NULL) {
		fprintf(stderr,"expand_mask:  ERROR.  Cannot open w %s\n", argv[2]);
		exit(-1);
	}
	if ((fwrite(b, 1, OUTSIZE, fp)) != OUTSIZE) {
		fprintf(stderr,"expand_mask:  ERROR during write of %s\n", argv[2]);
		exit(-1);
	}
	fclose(fp);

	exit(0);
}