[wxWidgets.git] / src / tiff / tools / sgi2tiff.c

/* $Id$ */

/*
 * Copyright (c) 1991-1997 Sam Leffler
 * Copyright (c) 1991-1997 Silicon Graphics, Inc.
 *
 * Permission to use, copy, modify, distribute, and sell this software and 
 * its documentation for any purpose is hereby granted without fee, provided
 * that (i) the above copyright notices and this permission notice appear in
 * all copies of the software and related documentation, and (ii) the names of
 * Sam Leffler and Silicon Graphics may not be used in any advertising or
 * publicity relating to the software without the specific, prior written
 * permission of Sam Leffler and Silicon Graphics.
 * 
 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 
 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 
 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  
 * 
 * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 
 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 
 * OF THIS SOFTWARE.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gl/image.h>
#include <ctype.h>

#include "tiffio.h"

#define	streq(a,b)	(strcmp(a,b) == 0)
#define	strneq(a,b,n)	(strncmp(a,b,n) == 0)

static	short config = PLANARCONFIG_CONTIG;
static	uint16 compression = COMPRESSION_PACKBITS;
static	uint16 predictor = 0;
static	uint16 fillorder = 0;
static	uint32 rowsperstrip = (uint32) -1;
static	int jpegcolormode = JPEGCOLORMODE_RGB;
static	int quality = 75;		/* JPEG quality */
static	uint16 photometric;

static	void usage(void);
static	int cpContig(IMAGE*, TIFF*);
static	int cpSeparate(IMAGE*, TIFF*);
static	int processCompressOptions(char*);

/* XXX image library has no prototypes */
extern	IMAGE* iopen(const char*, const char*);
extern	void iclose(IMAGE*);
extern	void getrow(IMAGE*, short*, int, int);

int
main(int argc, char* argv[])
{
	IMAGE *in;
	TIFF *out;
	int c;
	extern int optind;
	extern char* optarg;

	while ((c = getopt(argc, argv, "c:p:r:")) != -1)
		switch (c) {
		case 'c':		/* compression scheme */
			if (!processCompressOptions(optarg))
				usage();
			break;
		case 'f':		/* fill order */
			if (streq(optarg, "lsb2msb"))
				fillorder = FILLORDER_LSB2MSB;
			else if (streq(optarg, "msb2lsb"))
				fillorder = FILLORDER_MSB2LSB;
			else
				usage();
			break;
		case 'p':		/* planar configuration */
			if (streq(optarg, "separate"))
				config = PLANARCONFIG_SEPARATE;
			else if (streq(optarg, "contig"))
				config = PLANARCONFIG_CONTIG;
			else
				usage();
			break;
		case 'r':		/* rows/strip */
			rowsperstrip = atoi(optarg);
			break;
		case '?':
			usage();
			/*NOTREACHED*/
		}
	if (argc - optind != 2)
		usage();
	in = iopen(argv[optind], "r");
	if (in == NULL)
		return (-1);
	out = TIFFOpen(argv[optind+1], "w");
	if (out == NULL)
		return (-2);
	TIFFSetField(out, TIFFTAG_IMAGEWIDTH, (uint32) in->xsize);
	TIFFSetField(out, TIFFTAG_IMAGELENGTH, (uint32) in->ysize);
	TIFFSetField(out, TIFFTAG_BITSPERSAMPLE, 8);
	TIFFSetField(out, TIFFTAG_COMPRESSION, compression);
	if (in->zsize == 1)
		photometric = PHOTOMETRIC_MINISBLACK;
	else
		photometric = PHOTOMETRIC_RGB;
	switch (compression) {
	case COMPRESSION_JPEG:
		if (photometric == PHOTOMETRIC_RGB && jpegcolormode == JPEGCOLORMODE_RGB)
			photometric = PHOTOMETRIC_YCBCR;
		TIFFSetField(out, TIFFTAG_JPEGQUALITY, quality);
		TIFFSetField(out, TIFFTAG_JPEGCOLORMODE, jpegcolormode);
		break;
	case COMPRESSION_LZW:
	case COMPRESSION_DEFLATE:
		if (predictor != 0)
			TIFFSetField(out, TIFFTAG_PREDICTOR, predictor);
		break;
	}
	TIFFSetField(out, TIFFTAG_PHOTOMETRIC, photometric);
	if (fillorder != 0)
		TIFFSetField(out, TIFFTAG_FILLORDER, fillorder);
	TIFFSetField(out, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
	TIFFSetField(out, TIFFTAG_SAMPLESPERPIXEL, in->zsize);
	if (in->zsize > 3) {
	    uint16 v[1];
	    v[0] = EXTRASAMPLE_UNASSALPHA;
	    TIFFSetField(out, TIFFTAG_EXTRASAMPLES, 1, v);
	}
	TIFFSetField(out, TIFFTAG_MINSAMPLEVALUE, (uint16) in->min);
	TIFFSetField(out, TIFFTAG_MAXSAMPLEVALUE, (uint16) in->max);
	TIFFSetField(out, TIFFTAG_PLANARCONFIG, config);
	if (config != PLANARCONFIG_SEPARATE)
		TIFFSetField(out, TIFFTAG_ROWSPERSTRIP,
		    TIFFDefaultStripSize(out, rowsperstrip));
	else			/* force 1 row/strip for library limitation */
		TIFFSetField(out, TIFFTAG_ROWSPERSTRIP, 1L);
	if (in->name[0] != '\0')
		TIFFSetField(out, TIFFTAG_IMAGEDESCRIPTION, in->name);
	if (config == PLANARCONFIG_CONTIG)
		cpContig(in, out);
	else
		cpSeparate(in, out);
	(void) iclose(in);
	(void) TIFFClose(out);
	return (0);
}

static int
processCompressOptions(char* opt)
{
	if (streq(opt, "none"))
		compression = COMPRESSION_NONE;
	else if (streq(opt, "packbits"))
		compression = COMPRESSION_PACKBITS;
	else if (strneq(opt, "jpeg", 4)) {
		char* cp = strchr(opt, ':');

                defcompression = COMPRESSION_JPEG;
                while( cp )
                {
                    if (isdigit((int)cp[1]))
			quality = atoi(cp+1);
                    else if (cp[1] == 'r' )
			jpegcolormode = JPEGCOLORMODE_RAW;
                    else
                        usage();

                    cp = strchr(cp+1,':');
                }
	} else if (strneq(opt, "lzw", 3)) {
		char* cp = strchr(opt, ':');
		if (cp)
			predictor = atoi(cp+1);
		compression = COMPRESSION_LZW;
	} else if (strneq(opt, "zip", 3)) {
		char* cp = strchr(opt, ':');
		if (cp)
			predictor = atoi(cp+1);
		compression = COMPRESSION_DEFLATE;
	} else
		return (0);
	return (1);
}

static int
cpContig(IMAGE* in, TIFF* out)
{
	tdata_t buf = _TIFFmalloc(TIFFScanlineSize(out));
	short *r = NULL;
	int x, y;

	if (in->zsize == 3) {
		short *g, *b;

		r = (short *)_TIFFmalloc(3 * in->xsize * sizeof (short));
		g = r + in->xsize;
		b = g + in->xsize;
		for (y = in->ysize-1; y >= 0; y--) {
			uint8* pp = (uint8*) buf;

			getrow(in, r, y, 0);
			getrow(in, g, y, 1);
			getrow(in, b, y, 2);
			for (x = 0; x < in->xsize; x++) {
				pp[0] = r[x];
				pp[1] = g[x];
				pp[2] = b[x];
				pp += 3;
			}
			if (TIFFWriteScanline(out, buf, in->ysize-y-1, 0) < 0)
				goto bad;
		}
	} else if (in->zsize == 4) {
		short *g, *b, *a;

		r = (short *)_TIFFmalloc(4 * in->xsize * sizeof (short));
		g = r + in->xsize;
		b = g + in->xsize;
		a = b + in->xsize;
		for (y = in->ysize-1; y >= 0; y--) {
			uint8* pp = (uint8*) buf;

			getrow(in, r, y, 0);
			getrow(in, g, y, 1);
			getrow(in, b, y, 2);
			getrow(in, a, y, 3);
			for (x = 0; x < in->xsize; x++) {
				pp[0] = r[x];
				pp[1] = g[x];
				pp[2] = b[x];
				pp[3] = a[x];
				pp += 4;
			}
			if (TIFFWriteScanline(out, buf, in->ysize-y-1, 0) < 0)
				goto bad;
		}
	} else {
		uint8* pp = (uint8*) buf;

		r = (short *)_TIFFmalloc(in->xsize * sizeof (short));
		for (y = in->ysize-1; y >= 0; y--) {
			getrow(in, r, y, 0);
			for (x = in->xsize-1; x >= 0; x--)
				pp[x] = r[x];
			if (TIFFWriteScanline(out, buf, in->ysize-y-1, 0) < 0)
				goto bad;
		}
	}
	if (r)
		_TIFFfree(r);
	_TIFFfree(buf);
	return (1);
bad:
	if (r)
		_TIFFfree(r);
	_TIFFfree(buf);
	return (0);
}

static int
cpSeparate(IMAGE* in, TIFF* out)
{
	tdata_t buf = _TIFFmalloc(TIFFScanlineSize(out));
	short *r = (short *)_TIFFmalloc(in->xsize * sizeof (short));
	uint8* pp = (uint8*) buf;
	int x, y, z;

	for (z = 0; z < in->zsize; z++) {
		for (y = in->ysize-1; y >= 0; y--) {
			getrow(in, r, y, z);
			for (x = 0; x < in->xsize; x++)
				pp[x] = r[x];
			if (TIFFWriteScanline(out, buf, in->ysize-y-1, z) < 0)
				goto bad;
		}
	}
	_TIFFfree(r);
	_TIFFfree(buf);
	return (1);
bad:
	_TIFFfree(r);
	_TIFFfree(buf);
	return (0);
}

char* stuff[] = {
"usage: sgi2tiff [options] input.rgb output.tif",
"where options are:",
" -r #		make each strip have no more than # rows",
"",
" -p contig	pack samples contiguously (e.g. RGBRGB...)",
" -p separate	store samples separately (e.g. RRR...GGG...BBB...)",
"",
" -f lsb2msb	force lsb-to-msb FillOrder for output",
" -f msb2lsb	force msb-to-lsb FillOrder for output",
"",
" -c lzw[:opts]	compress output with Lempel-Ziv & Welch encoding",
" -c zip[:opts]	compress output with deflate encoding",
" -c jpeg[:opts]compress output with JPEG encoding",
" -c packbits	compress output with packbits encoding",
" -c none	use no compression algorithm on output",
"",
"JPEG options:",
" #		set compression quality level (0-100, default 75)",
" r		output color image as RGB rather than YCbCr",
"",
"LZW and deflate options:",
" #		set predictor value",
"For example, -c lzw:2 to get LZW-encoded data with horizontal differencing",
NULL
};

static void
usage(void)
{
	char buf[BUFSIZ];
	int i;

	setbuf(stderr, buf);
	for (i = 0; stuff[i] != NULL; i++)
		fprintf(stderr, "%s\n", stuff[i]);
	exit(-1);
}
/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 8
 * fill-column: 78
 * End:
 */
Commit	Line	Data
8414a40c VZ	1	/* $Id$ */
	2
	3	/*
	4	* Copyright (c) 1991-1997 Sam Leffler
	5	* Copyright (c) 1991-1997 Silicon Graphics, Inc.
	6	*
	7	* Permission to use, copy, modify, distribute, and sell this software and
	8	* its documentation for any purpose is hereby granted without fee, provided
	9	* that (i) the above copyright notices and this permission notice appear in
	10	* all copies of the software and related documentation, and (ii) the names of
	11	* Sam Leffler and Silicon Graphics may not be used in any advertising or
	12	* publicity relating to the software without the specific, prior written
	13	* permission of Sam Leffler and Silicon Graphics.
	14	*
	15	* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
	16	* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
	17	* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
	18	*
	19	* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
	20	* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
	21	* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
	22	* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
	23	* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
	24	* OF THIS SOFTWARE.
	25	*/
	26
	27	#include <stdio.h>
	28	#include <stdlib.h>
	29	#include <string.h>
	30	#include <gl/image.h>
	31	#include <ctype.h>
	32
	33	#include "tiffio.h"
	34
	35	#define streq(a,b) (strcmp(a,b) == 0)
	36	#define strneq(a,b,n) (strncmp(a,b,n) == 0)
	37
	38	static short config = PLANARCONFIG_CONTIG;
	39	static uint16 compression = COMPRESSION_PACKBITS;
	40	static uint16 predictor = 0;
	41	static uint16 fillorder = 0;
	42	static uint32 rowsperstrip = (uint32) -1;
	43	static int jpegcolormode = JPEGCOLORMODE_RGB;
	44	static int quality = 75; /* JPEG quality */
	45	static uint16 photometric;
	46
	47	static void usage(void);
	48	static int cpContig(IMAGE, TIFF);
	49	static int cpSeparate(IMAGE, TIFF);
	50	static int processCompressOptions(char*);
	51
	52	/* XXX image library has no prototypes */
	53	extern IMAGE* iopen(const char, const char);
	54	extern void iclose(IMAGE*);
	55	extern void getrow(IMAGE, short, int, int);
	56
	57	int
	58	main(int argc, char* argv[])
	59	{
	60	IMAGE *in;
	61	TIFF *out;
	62	int c;
	63	extern int optind;
	64	extern char* optarg;
65
66	while ((c = getopt(argc, argv, "c:p:r:")) != -1)
67	switch (c) {
68	case 'c': /* compression scheme */
69	if (!processCompressOptions(optarg))
70	usage();
71	break;
72	case 'f': /* fill order */
73	if (streq(optarg, "lsb2msb"))
74	fillorder = FILLORDER_LSB2MSB;
75	else if (streq(optarg, "msb2lsb"))
76	fillorder = FILLORDER_MSB2LSB;
77	else
78	usage();
79	break;
80	case 'p': /* planar configuration */
81	if (streq(optarg, "separate"))
82	config = PLANARCONFIG_SEPARATE;
83	else if (streq(optarg, "contig"))
84	config = PLANARCONFIG_CONTIG;
85	else
86	usage();
87	break;
88	case 'r': /* rows/strip */
89	rowsperstrip = atoi(optarg);
90	break;
91	case '?':
92	usage();
93	/NOTREACHED/
94	}
95	if (argc - optind != 2)
96	usage();
97	in = iopen(argv[optind], "r");
98	if (in == NULL)
99	return (-1);
100	out = TIFFOpen(argv[optind+1], "w");
101	if (out == NULL)
102	return (-2);
103	TIFFSetField(out, TIFFTAG_IMAGEWIDTH, (uint32) in->xsize);
104	TIFFSetField(out, TIFFTAG_IMAGELENGTH, (uint32) in->ysize);
105	TIFFSetField(out, TIFFTAG_BITSPERSAMPLE, 8);
106	TIFFSetField(out, TIFFTAG_COMPRESSION, compression);
107	if (in->zsize == 1)
108	photometric = PHOTOMETRIC_MINISBLACK;
109	else
110	photometric = PHOTOMETRIC_RGB;
111	switch (compression) {
112	case COMPRESSION_JPEG:
113	if (photometric == PHOTOMETRIC_RGB && jpegcolormode == JPEGCOLORMODE_RGB)
114	photometric = PHOTOMETRIC_YCBCR;
115	TIFFSetField(out, TIFFTAG_JPEGQUALITY, quality);
116	TIFFSetField(out, TIFFTAG_JPEGCOLORMODE, jpegcolormode);
117	break;
118	case COMPRESSION_LZW:
119	case COMPRESSION_DEFLATE:
120	if (predictor != 0)
121	TIFFSetField(out, TIFFTAG_PREDICTOR, predictor);
122	break;
123	}
124	TIFFSetField(out, TIFFTAG_PHOTOMETRIC, photometric);
125	if (fillorder != 0)
126	TIFFSetField(out, TIFFTAG_FILLORDER, fillorder);
127	TIFFSetField(out, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
128	TIFFSetField(out, TIFFTAG_SAMPLESPERPIXEL, in->zsize);
129	if (in->zsize > 3) {
130	uint16 v[1];
131	v[0] = EXTRASAMPLE_UNASSALPHA;
132	TIFFSetField(out, TIFFTAG_EXTRASAMPLES, 1, v);
133	}
134	TIFFSetField(out, TIFFTAG_MINSAMPLEVALUE, (uint16) in->min);
135	TIFFSetField(out, TIFFTAG_MAXSAMPLEVALUE, (uint16) in->max);
136	TIFFSetField(out, TIFFTAG_PLANARCONFIG, config);
137	if (config != PLANARCONFIG_SEPARATE)
138	TIFFSetField(out, TIFFTAG_ROWSPERSTRIP,
139	TIFFDefaultStripSize(out, rowsperstrip));
140	else /* force 1 row/strip for library limitation */
141	TIFFSetField(out, TIFFTAG_ROWSPERSTRIP, 1L);
142	if (in->name[0] != '\0')
143	TIFFSetField(out, TIFFTAG_IMAGEDESCRIPTION, in->name);
144	if (config == PLANARCONFIG_CONTIG)
145	cpContig(in, out);
146	else
147	cpSeparate(in, out);
148	(void) iclose(in);
149	(void) TIFFClose(out);
150	return (0);
151	}
152
153	static int
154	processCompressOptions(char* opt)
155	{
156	if (streq(opt, "none"))
157	compression = COMPRESSION_NONE;
158	else if (streq(opt, "packbits"))
159	compression = COMPRESSION_PACKBITS;
160	else if (strneq(opt, "jpeg", 4)) {
161	char* cp = strchr(opt, ':');
162
163	defcompression = COMPRESSION_JPEG;
164	while( cp )
165	{
166	if (isdigit((int)cp[1]))
167	quality = atoi(cp+1);
168	else if (cp[1] == 'r' )
169	jpegcolormode = JPEGCOLORMODE_RAW;
170	else
171	usage();
172
173	cp = strchr(cp+1,':');
174	}
175	} else if (strneq(opt, "lzw", 3)) {
176	char* cp = strchr(opt, ':');
177	if (cp)
178	predictor = atoi(cp+1);
179	compression = COMPRESSION_LZW;
180	} else if (strneq(opt, "zip", 3)) {
181	char* cp = strchr(opt, ':');
182	if (cp)
183	predictor = atoi(cp+1);
184	compression = COMPRESSION_DEFLATE;
185	} else
186	return (0);
187	return (1);
188	}
189
190	static int
191	cpContig(IMAGE* in, TIFF* out)
192	{
193	tdata_t buf = _TIFFmalloc(TIFFScanlineSize(out));
194	short *r = NULL;
195	int x, y;
196
197	if (in->zsize == 3) {
198	short g, b;
199
200	r = (short )_TIFFmalloc(3 in->xsize * sizeof (short));
201	g = r + in->xsize;
202	b = g + in->xsize;
203	for (y = in->ysize-1; y >= 0; y--) {
204	uint8* pp = (uint8*) buf;
205
206	getrow(in, r, y, 0);
207	getrow(in, g, y, 1);
208	getrow(in, b, y, 2);
209	for (x = 0; x < in->xsize; x++) {
210	pp[0] = r[x];
211	pp[1] = g[x];
212	pp[2] = b[x];
213	pp += 3;
214	}
215	if (TIFFWriteScanline(out, buf, in->ysize-y-1, 0) < 0)
216	goto bad;
217	}
218	} else if (in->zsize == 4) {
219	short g, b, *a;
220
221	r = (short )_TIFFmalloc(4 in->xsize * sizeof (short));
222	g = r + in->xsize;
223	b = g + in->xsize;
224	a = b + in->xsize;
225	for (y = in->ysize-1; y >= 0; y--) {
226	uint8* pp = (uint8*) buf;
227
228	getrow(in, r, y, 0);
229	getrow(in, g, y, 1);
230	getrow(in, b, y, 2);
231	getrow(in, a, y, 3);
232	for (x = 0; x < in->xsize; x++) {
233	pp[0] = r[x];
234	pp[1] = g[x];
235	pp[2] = b[x];
236	pp[3] = a[x];
237	pp += 4;
238	}
239	if (TIFFWriteScanline(out, buf, in->ysize-y-1, 0) < 0)
240	goto bad;
241	}
242	} else {
243	uint8* pp = (uint8*) buf;
244
245	r = (short )_TIFFmalloc(in->xsize sizeof (short));
246	for (y = in->ysize-1; y >= 0; y--) {
247	getrow(in, r, y, 0);
248	for (x = in->xsize-1; x >= 0; x--)
249	pp[x] = r[x];
250	if (TIFFWriteScanline(out, buf, in->ysize-y-1, 0) < 0)
251	goto bad;
252	}
253	}
254	if (r)
255	_TIFFfree(r);
256	_TIFFfree(buf);
257	return (1);
258	bad:
259	if (r)
260	_TIFFfree(r);
261	_TIFFfree(buf);
262	return (0);
263	}
264
265	static int
266	cpSeparate(IMAGE* in, TIFF* out)
267	{
268	tdata_t buf = _TIFFmalloc(TIFFScanlineSize(out));
269	short r = (short )_TIFFmalloc(in->xsize * sizeof (short));
270	uint8* pp = (uint8*) buf;
271	int x, y, z;
272
273	for (z = 0; z < in->zsize; z++) {
274	for (y = in->ysize-1; y >= 0; y--) {
275	getrow(in, r, y, z);
276	for (x = 0; x < in->xsize; x++)
277	pp[x] = r[x];
278	if (TIFFWriteScanline(out, buf, in->ysize-y-1, z) < 0)
279	goto bad;
280	}
281	}
282	_TIFFfree(r);
283	_TIFFfree(buf);
284	return (1);
285	bad:
286	_TIFFfree(r);
287	_TIFFfree(buf);
288	return (0);
289	}
290
291	char* stuff[] = {
292	"usage: sgi2tiff [options] input.rgb output.tif",
293	"where options are:",
294	" -r # make each strip have no more than # rows",
295	"",
296	" -p contig pack samples contiguously (e.g. RGBRGB...)",
297	" -p separate store samples separately (e.g. RRR...GGG...BBB...)",
298	"",
299	" -f lsb2msb force lsb-to-msb FillOrder for output",
300	" -f msb2lsb force msb-to-lsb FillOrder for output",
301	"",
302	" -c lzw[:opts] compress output with Lempel-Ziv & Welch encoding",
303	" -c zip[:opts] compress output with deflate encoding",
304	" -c jpeg[:opts]compress output with JPEG encoding",
305	" -c packbits compress output with packbits encoding",
306	" -c none use no compression algorithm on output",
307	"",
308	"JPEG options:",
309	" # set compression quality level (0-100, default 75)",
310	" r output color image as RGB rather than YCbCr",
311	"",
312	"LZW and deflate options:",
313	" # set predictor value",
314	"For example, -c lzw:2 to get LZW-encoded data with horizontal differencing",
315	NULL
316	};
317
318	static void
319	usage(void)
320	{
321	char buf[BUFSIZ];
322	int i;
323
324	setbuf(stderr, buf);
325	for (i = 0; stuff[i] != NULL; i++)
326	fprintf(stderr, "%s\n", stuff[i]);
327	exit(-1);
328	}
80ed523f VZ	329	/*
	330	* Local Variables:
	331	* mode: c
	332	* c-basic-offset: 8
	333	* fill-column: 78
	334	* End:
	335	*/