ftp.nice.ch/pub/next/graphics/viewer/ToyViewer.2.6.s.tar.gz#/ToyViewer2.6/src/ImageSave.bproj/ImageSvXBM.m

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#import "../ImageSave.h"
#import <appkit/NXImage.h>
#import <appkit/SavePanel.h>
#import <stdio.h>
#import <libc.h>
#import <string.h>
#import "../ToyView.h"
#import "../ToyWin.h"
#import "../strfunc.h"
#import "../common.h"
#import "save.h"

@implementation ImageSave (SaveXBM)

static unsigned char flipbits[256];

static void init_table(NXColorSpace cspace)
{
	int i, n, nr, m;
	static NXColorSpace svCSpace;

	if (flipbits[1]) { /* flipbits was initialized */
		if (svCSpace != cspace)
		for (i = 0; i < 256; i++)
			flipbits[i] ^= 0xff;
	}else {
		for (n = nr = 0; ; n++) {
			flipbits[n] = nr;
			if (n >= 255) break;
			for (i = 1; nr & (m = 0x100 >> i); i++)
				;
			nr = (nr & (0xff >> i)) | m;
		}
		if (cspace == NX_OneIsWhiteColorSpace)
			for (i = 0; i < 256; i++)
				flipbits[i] ^= 0xff;
	}
	svCSpace = cspace;
}

static char *getNickname(const char *sav)
{
	int i, j, cc, slash, period;
	char buf[256], *nick;

	period = slash = 0;
	for (i = 0; sav[i]; i++) {
		if (sav[i] == '/') slash = i + 1;
		else if (sav[i] == '.') period = i;
	}
	strcpy(buf, &sav[slash]);
	if (period > slash) buf[period - slash] = 0;
	nick = (char *)malloc(strlen(buf) + 2);
	j = 0;
	if (buf[0] >= '0' && buf[0] <= '9')
		nick[j++] = 'x';
	for (i = 0; (cc = buf[i]) != 0; i++)
		if ((cc >= 'a' && cc <= 'z')
		|| (cc >= 'A' && cc <= 'Z') || (cc >= '0' && cc <= '9'))
			nick[j++] = cc;
	if (j == 0) nick[j++] = 'x';
	nick[j] = 0;
	return nick;
}

- saveAsXBM: sender
{
	FILE	*fp;
	char	*sav, *nickname = NULL;
	commonInfo *cinf;
	unsigned char *map[MAXPLANE];
	int	x, y, xb, xbytes, cnt, err;
	unsigned char *pp, *pmap = NULL;

	cinf = [toyView commonInfo];
	if (cinf->bits > 2 || cinf->numcolors != 1
			|| cinf->cspace == NX_CMYKColorSpace) {
		/* ignore alpha, ignore 2 bits gray. Because of EPS... */
		warnAlert([toyWin filename], Err_SAV_IMPL);
		return self;
	}
	sav = [self getSavename:[toyWin filename] with: Type_xbm];
	if (sav == NULL) /* canceled */
		return self;
	if ((fp = fopen(sav, "w")) == NULL) {
		errAlert(sav, Err_SAVE);
		return self;
	}
	if ((err = [toyWin getBitmap:map info: &cinf]) != 0)
		goto EXIT;

	xbytes = xb = (cinf->width + 7) >> 3;
	if (cinf->alpha || cinf->bits != 1) {
		if ((err = initGetPixel(cinf)) != 0)
			goto EXIT;
		resetPixel(map, 0);
		pmap = pp = allocBilevelMap(cinf);
		if (!pp) {
			err = Err_MEMORY;
			goto EXIT;
		}
		init_table(NX_OneIsBlackColorSpace);
	}else {
		init_table(cinf->cspace);
		pp = map[0];
		xbytes = cinf->xbytes;
	}

	cnt = 0;
	nickname = getNickname(sav);
	fprintf(fp, "#define %s_width  %d\n", nickname, cinf->width);
	fprintf(fp, "#define %s_height %d\n", nickname, cinf->height);
	fprintf(fp, "static char %s_bits[] = {\n ", nickname);
	for (y = 1; y < cinf->height; y++) {
		for (x = 0; x < xb; x++) {
			fprintf(fp, "0x%02x,", flipbits[*pp++]);
			if (++cnt >= 10) {
				fprintf(fp, "\n ");
				cnt = 0;
			}
		}
		for ( ; x < xbytes; x++) ++pp;
	}
	for (x = 0; ; ) {
		fprintf(fp, "0x%02x", flipbits[*pp++]);
		if (++x >= xb) break;
		putc(',', fp);
		if (++cnt >= 10) {
			fprintf(fp, "\n ");
			cnt = 0;
		}
	}
	fprintf(fp, "};\n");

EXIT:
	if (fp) (void)fclose(fp);
	if (err) {
		errAlert(sav, err);
		(void)unlink(sav);
	}else
		[toyWin resetFilename:sav];
	if (nickname) free((void *)nickname);
	if (pmap) free((void *)pmap);
	return self;
}

@end

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.