/*# proc: bytes2bits - converts a grayscale image into a binary image.# proc:*//* LINTLIBRARY */#include <stdio.h>#include <values.h>#include <sys/param.h>#include <sys/types.h>bytes2bits(p,q,pixels)u_char *p, *q;register u_int pixels;{register u_char *r, a;register u_long *l;register u_char b;if (p == (u_char *) NULL)	fatalerr("bytes2bits", "null src pointer", NULL);if (q == (u_char *) NULL)	fatalerr("bytes2bits", "null dst pointer", NULL);pixels = howmany(pixels,BITSPERBYTE);r = q;l = (u_long *) p;while (pixels--) {	switch (*l++) {		case 0x00000000:	a = 0x00; break;		case 0x00000001:	a = 0x10; break;		case 0x00000100:	a = 0x20; break;		case 0x00000101:	a = 0x30; break;		case 0x00010000:	a = 0x40; break;		case 0x00010001:	a = 0x50; break;		case 0x00010100:	a = 0x60; break;		case 0x00010101:	a = 0x70; break;		case 0x01000000:	a = 0x80; break;		case 0x01000001:	a = 0x90; break;		case 0x01000100:	a = 0xa0; break;		case 0x01000101:	a = 0xb0; break;		case 0x01010000:	a = 0xc0; break;		case 0x01010001:	a = 0xd0; break;		case 0x01010100:	a = 0xe0; break;		case 0x01010101:	a = 0xf0; break;		default:		  (void) fprintf(stderr,"bytes2bits: bad value %x\n",*--l);		  exit(1);	}	switch (*l++) {		case 0x00000000:	b = 0x00; break;		case 0x00000001:	b = 0x01; break;		case 0x00000100:	b = 0x02; break;		case 0x00000101:	b = 0x03; break;		case 0x00010000:	b = 0x04; break;		case 0x00010001:	b = 0x05; break;		case 0x00010100:	b = 0x06; break;		case 0x00010101:	b = 0x07; break;		case 0x01000000:	b = 0x08; break;		case 0x01000001:	b = 0x09; break;		case 0x01000100:	b = 0x0a; break;		case 0x01000101:	b = 0x0b; break;		case 0x01010000:	b = 0x0c; break;		case 0x01010001:	b = 0x0d; break;		case 0x01010100:	b = 0x0e; break;		case 0x01010101:	b = 0x0f; break;		default:		  (void) fprintf(stderr,"bytes2bits: bad value %x\n",*--l);		  exit(1);	}	*r++ = a | b;}}