src/util/rcode_ident.c

#ifndef lint
static const char RCSid[] = "$Id: rcode_ident.c,v 2.6 2019/07/24 00:25:51 greg Exp $";
#endif
/*
 * Create or read identifier index map
 *
 */

#include <stdlib.h>
#include <ctype.h>
#include "rtio.h"
#include "platform.h"
#include "lookup.h"
#include "idmap.h"

#ifndef MAXIDLEN
#define MAXIDLEN        256             /* longest ID length supported */
#endif

#define HF_TABLOUT      0x100           /* output ID table after header */

char            *progname;              /* global argv[0] */

static int      unbuffered = 0;
static int      numeric = 0;
static int      sepc = '\n';


/* Report usage error and exit */
static void
usage_exit(int code)
{
        fputs("Usage: ", stderr);
        fputs(progname, stderr);
        fputs(" [-8|-16|-24][-h][-tS][-x xr -y yr] [input.txt [output.idx]]\n",
                        stderr);
        fputs("   Or: ", stderr);
        fputs(progname, stderr);
        fputs(" -r [-i][-u][-h][-H][-l][-n][-tS] input.idx [output.txt]\n",
                        stderr);
        exit(code);
}


/* read identifier from input, trimming white space on either end */
static int
scan_ident(char ident[MAXIDLEN], FILE *fp)
{
        char    *cp = ident;
        int     c;

        while ((c = getc(fp)) != EOF) {
                if (cp == ident && isspace(c))
                        continue;
                if (c == sepc) {
                        while (cp > ident && isspace(cp[-1]))
                                cp--;
                        *cp = '\0';
                        return cp - ident;      /* return string length */
                }
                if (cp - ident >= MAXIDLEN-1) {
                        fputs(progname, stderr);
                        fputs(": identifier too long in scan_ident()\n", stderr);
                        return -1;
                }
                *cp++ = c;
        }
        return -1;
}


/* elide format from header lines */
static int
headline(char *s, void *p)
{
        extern const char       FMTSTR[];

        if (strstr(s, FMTSTR) == s)
                return 0;

        fputs(s, stdout);
        return 1;
}


/* Create an identifier index from the given input file (stdin if NULL) */
int
create_index(const char *fname, int hdrflags, int ndxbytes, int xres, int yres)
{
        FILE    *fp = stdin;
        char    **idmap;
        int     idmlen;
        int     nextID = 0;
        LUTAB   hashtab;
        RESOLU  rs;
        long    n;
        int     ndx;
                                        /* open file if not stdin */
        if (!fname)
                fname = "<stdin>";
        else if (!(fp = fopen(fname, "r"))) {
                fputs(fname, stderr);
                fputs(": cannot open for input\n", stderr);
                return 0;
        }
#ifdef getc_unlocked                    /* avoid stupid semaphores */
        flockfile(fp);
#endif
                                        /* load/copy header */
        if (hdrflags & HF_HEADOUT && getheader(fp, headline, NULL) < 0) {
                fputs(fname, stderr);
                fputs(": bad header or wrong input format\n", stderr);
                fclose(fp);
                return 0;
        }
        if (!(hdrflags & HF_HEADOUT))
                newheader("RADIANCE", stdout);
                                        /* finish & allocate ID table */
        switch (ndxbytes) {
        case 1:
                fputformat(IDMAP8FMT, stdout);
                idmap = (char **)malloc((idmlen=256)*sizeof(char *));
                break;
        case 2:
                fputformat(IDMAP16FMT, stdout);
                idmap = (char **)malloc((idmlen=4096)*sizeof(char *));
                break;
        case 3:
                fputformat(IDMAP24FMT, stdout);
                idmap = (char **)malloc((idmlen=1L<<17)*sizeof(char *));
                break;
        default:
                fputs(progname, stderr);
                fputs(": unsupported bits/pixel\n", stderr);
                return 0;
        }
        memset(&hashtab, 0, sizeof(hashtab));
        hashtab.hashf = lu_shash;
        hashtab.keycmp = strcmp;
        hashtab.freek = free;
        if (!idmap || !lu_init(&hashtab, idmlen))
                goto memerr;
        fputc('\n', stdout);            /* end of info header */

        rs.rt = PIXSTANDARD;            /* get/write map resolution */
        if (hdrflags & HF_RESOUT) {
                if (!fgetsresolu(&rs, fp)) {
                        fputs(fname, stderr);
                        fputs(": bad resolution string\n", stderr);
                        return 0;
                }
        } else if (((rs.xr = xres) <= 0) | ((rs.yr = yres) <= 0)) {
                fputs(fname, stderr);
                fputs(": missing/illegal resolution\n", stderr);
                return 0;
        }
        fputsresolu(&rs, stdout);
                                        /* read/assign/write each ID */
        for (n = (long)rs.xr*rs.yr; n-- > 0; ) {
                LUENT   *lep;
                char    ident[MAXIDLEN];
                int     len = scan_ident(ident, fp);
                if (len < 0) {
                        if (feof(fp)) {
                                fputs(fname, stderr);
                                fputs(": unexpected EOF\n", stderr);
                        }
                        return 0;
                }
                lep = lu_find(&hashtab, ident);
                if (!lep->key) {                        /* new entry */
                        if (nextID >= 1<<(ndxbytes<<3)) {
                                fputs(progname, stderr);
                                fputs(
                        ": too many unique identifiers for index size\n",
                                                stderr);
                                return 0;
                        }
                        if (nextID >= idmlen) {         /* reallocate? */
                                idmlen += idmlen>>2;    /* +25% growth */
                                idmap = (char **)realloc(idmap, idmlen);
                                if (!idmap)
                                        goto memerr;
                        }
                        lep->key = (char *)malloc(len+1);
                        if (!lep->key)
                                goto memerr;
                        idmap[nextID] = strcpy(lep->key, ident);
                        lep->data = (char *)nextID++;
                }
                                                /* write this id index */
                putint((int)lep->data, ndxbytes, stdout);
        }
        while ((ndx = getc(fp)) != EOF)         /* verify we got them all */
                if (!isspace(ndx)) {
                        fputs(fname, stderr);
                        fputs(": warning -  non-white characters past end\n",
                                        stderr);
                        break;
                }
        if (fp != stdin)                        /* done with input */
                fclose(fp);
        for (ndx = 0; ndx < nextID; ndx++) {    /* append string table */
                fputs(idmap[ndx], stdout);
                putchar('\0');                  /* nul-terminated IDs */
        }
        free(idmap);                            /* clean up */
        lu_done(&hashtab);
        return 1;
memerr:
        fputs(progname, stderr);
        fputs(": out of memory!\n", stderr);
        return 0;
}


/* print out ID table */
void
print_IDs(IDMAP *idmp)
{
        int     i;

        printf("============ %d IDs ============\n", idmp->nids);

        for (i = 0; i < idmp->nids; i++) {
                fputs(mapID(idmp, i), stdout);
                putchar(sepc);
        }
        if (sepc != '\n')
                fputc('\n', stdout);
        puts("============= END =============");
}


/* Load selected pixels from identifier index file */
int
decode_select(const char *fname, int hdrflags)
{
        IDMAP   *idmp = idmap_ropen(fname, hdrflags);
        int     i, j;

        if (!idmp)
                return 0;

        if (hdrflags & HF_TABLOUT)
                print_IDs(idmp);

        if (idmp->res.rt != PIXSTANDARD) {
                fputs(progname, stderr);
                fputs(": can only handle standard pixel ordering\n", stderr);
                idmap_close(idmp);
                return 0;
        }
        while (scanf("%d %d", &i, &j) == 2) {
                i = idmap_seek(idmp, i, idmp->res.yr-1 - j);
                if (!i) {
                        fputs(progname, stderr);
                        fputs(": warning - pixel index is off map\n", stderr);
                        continue;
                }
                if (i > 0)
                        i = idmap_next_i(idmp);
                if (i < 0) {
                        fputs(fname, stderr);
                        fputs(": read/seek error in decode_select()\n", stderr);
                        idmap_close(idmp);
                        return 0;
                }
                if (numeric) {
                        printf("%d", i);
                } else {
                        const char      *id = mapID(idmp, i);
                        if (!id) {
                                fputs(fname, stderr);
                                fputs(": bad ID index in file\n", stderr);
                                idmap_close(idmp);
                                return 0;
                        }
                        fputs(id, stdout);
                }
                putchar(sepc);
                if (unbuffered && fflush(stdout) == EOF) {
                        fputs(progname, stderr);
                        fputs(": write error on output\n", stderr);
                        idmap_close(idmp);
                        return 0;
                }
        }
        idmap_close(idmp);

        if (!feof(stdin)) {
                fputs(progname, stderr);
                fputs(": non-numeric input for pixel index\n", stderr);
                return 0;
        }
        return 1;
}


/* Load and convert identifier index file to ASCII */
int
decode_all(const char *fname, int hdrflags)
{
        IDMAP   *idmp = idmap_ropen(fname, hdrflags);
        long    n;

        if (!idmp)
                return 0;

        if (hdrflags & HF_TABLOUT)
                print_IDs(idmp);

        for (n = idmp->res.xr*idmp->res.yr; n-- > 0; ) {
                const int       ndx = idmap_next_i(idmp);
                if (ndx < 0) {
                        fputs(fname, stderr);
                        fputs(": unexpected EOF\n", stderr);
                        idmap_close(idmp);
                        return 0;
                }
                if (numeric) {
                        printf("%d", ndx);
                } else {
                        const char      *id = mapID(idmp, ndx);
                        if (!id) {
                                fputs(fname, stderr);
                                fputs(": bad ID index in file\n", stderr);
                                idmap_close(idmp);
                                return 0;
                        }
                        fputs(id, stdout);
                }
                putchar(sepc);
        }
        idmap_close(idmp);
        return 1;
}


int
main(int argc, char *argv[])
{
        char    *inpfname = NULL;
        int     reverse = 0;
        int     bypixel = 0;
        int     hdrflags = HF_HEADOUT|HF_RESOUT;
        int     xres=0, yres=0;
        int     ndxbytes = 2;
        int     a;
        
        progname = argv[0];
        for (a = 1; a < argc && argv[a][0] == '-'; a++)
                switch (argv[a][1]) {
                case 'r':
                        reverse++;
                        break;
                case 'i':
                        bypixel++;
                        break;
                case 'u':
                        unbuffered++;
                        break;
                case 'n':
                        numeric++;
                        break;
                case 'l':
                        hdrflags |= HF_TABLOUT;
                        break;
                case 'h':
                        hdrflags &= ~HF_HEADOUT;
                        break;
                case 'H':
                        hdrflags &= ~HF_RESOUT;
                        break;
                case 't':
                        if (!(sepc = argv[a][2]))
                                sepc = '\n';
                        break;
                case 'x':
                        xres = atoi(argv[++a]);
                        break;
                case 'y':
                        yres = atoi(argv[++a]);
                        break;
                case '8':
                case '1':
                case '2':
                        switch (atoi(argv[a]+1)) {
                        case 8:
                                ndxbytes = 1;
                                break;
                        case 16:
                                ndxbytes = 2;
                                break;
                        case 24:
                                ndxbytes = 3;
                                break;
                        default:
                                usage_exit(1);
                        }
                        break;
                default:
                        usage_exit(1);
                }
        if ((xres > 0) & (yres > 0))    /* user specified resolution? */
                hdrflags &= ~HF_RESOUT;
        if (reverse && a >= argc) {
                fputs(progname, stderr);
                fputs(": -r option requires named input file\n", stderr);
                return 1;
        }
        if (a < argc-2) {
                fputs(progname, stderr);
                fputs(": too many file arguments\n", stderr);
                return 1;
        }
        if (a < argc)
                inpfname = argv[a];
        if (a+1 < argc && !freopen(argv[a+1], "w", stdout)) {
                fputs(argv[a+1], stderr);
                fputs(": cannot open output\n", stderr);
                return 1;
        }
        if (!reverse)
                SET_FILE_BINARY(stdout);
#ifdef getc_unlocked                    /* avoid stupid semaphores */
        flockfile(stdout);
#endif
        if (reverse) {
                if (!(bypixel ? decode_select(inpfname, hdrflags) :
                                decode_all(inpfname, hdrflags)))
                        return 1;
        } else if (!create_index(inpfname, hdrflags, ndxbytes, xres, yres))
                return 1;

        if (fflush(stdout) == EOF) {
                fputs(progname, stderr);
                fputs(": error writing output\n", stderr);
                return 1;
        }
        return 0;
}
Revision:	2.7
Committed:	Wed Jul 24 17:50:32 2019 UTC (4 years, 8 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.6:	+7 -4 lines
Log Message:	Use separation character for ID table output
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.7	static const char RCSid[] = "$Id: rcode_ident.c,v 2.6 2019/07/24 00:25:51 greg Exp $";
3	greg	2.1	#endif
4			/*
5			* Create or read identifier index map
6			*
7			*/
8
9			#include <stdlib.h>
10			#include <ctype.h>
11			#include "rtio.h"
12			#include "platform.h"
13			#include "lookup.h"
14			#include "idmap.h"
15
16			#ifndef MAXIDLEN
17			#define MAXIDLEN 256 /* longest ID length supported */
18			#endif
19
20	greg	2.3	#define HF_TABLOUT 0x100 /* output ID table after header */
21
22	greg	2.1	char progname; / global argv[0] */
23
24			static int unbuffered = 0;
25	greg	2.3	static int numeric = 0;
26	greg	2.1	static int sepc = '\n';
27
28
29			/* Report usage error and exit */
30			static void
31			usage_exit(int code)
32			{
33			fputs("Usage: ", stderr);
34			fputs(progname, stderr);
35			fputs(" [-8\|-16\|-24][-h][-tS][-x xr -y yr] [input.txt [output.idx]]\n",
36			stderr);
37			fputs(" Or: ", stderr);
38			fputs(progname, stderr);
39	greg	2.3	fputs(" -r [-i][-u][-h][-H][-l][-n][-tS] input.idx [output.txt]\n",
40			stderr);
41	greg	2.1	exit(code);
42			}
43
44
45			/* read identifier from input, trimming white space on either end */
46			static int
47			scan_ident(char ident[MAXIDLEN], FILE *fp)
48			{
49			char *cp = ident;
50			int c;
51
52			while ((c = getc(fp)) != EOF) {
53			if (cp == ident && isspace(c))
54			continue;
55			if (c == sepc) {
56			while (cp > ident && isspace(cp[-1]))
57			cp--;
58			*cp = '\0';
59			return cp - ident; /* return string length */
60			}
61			if (cp - ident >= MAXIDLEN-1) {
62			fputs(progname, stderr);
63			fputs(": identifier too long in scan_ident()\n", stderr);
64			return -1;
65			}
66			*cp++ = c;
67			}
68			return -1;
69			}
70
71
72			/* elide format from header lines */
73			static int
74			headline(char s, void p)
75			{
76			extern const char FMTSTR[];
77
78			if (strstr(s, FMTSTR) == s)
79			return 0;
80
81			fputs(s, stdout);
82			return 1;
83			}
84
85
86			/* Create an identifier index from the given input file (stdin if NULL) */
87			int
88			create_index(const char *fname, int hdrflags, int ndxbytes, int xres, int yres)
89			{
90			FILE *fp = stdin;
91			char **idmap;
92			int idmlen;
93			int nextID = 0;
94	greg	2.5	LUTAB hashtab;
95	greg	2.1	RESOLU rs;
96			long n;
97			int ndx;
98			/* open file if not stdin */
99	greg	2.2	if (!fname)
100			fname = "<stdin>";
101			else if (!(fp = fopen(fname, "r"))) {
102	greg	2.1	fputs(fname, stderr);
103			fputs(": cannot open for input\n", stderr);
104			return 0;
105			}
106			#ifdef getc_unlocked /* avoid stupid semaphores */
107			flockfile(fp);
108			#endif
109			/* load/copy header */
110			if (hdrflags & HF_HEADOUT && getheader(fp, headline, NULL) < 0) {
111			fputs(fname, stderr);
112			fputs(": bad header or wrong input format\n", stderr);
113			fclose(fp);
114			return 0;
115			}
116			if (!(hdrflags & HF_HEADOUT))
117			newheader("RADIANCE", stdout);
118			/* finish & allocate ID table */
119			switch (ndxbytes) {
120			case 1:
121			fputformat(IDMAP8FMT, stdout);
122			idmap = (char *)malloc((idmlen=256)sizeof(char *));
123			break;
124			case 2:
125			fputformat(IDMAP16FMT, stdout);
126			idmap = (char *)malloc((idmlen=4096)sizeof(char *));
127			break;
128			case 3:
129			fputformat(IDMAP24FMT, stdout);
130			idmap = (char *)malloc((idmlen=1L<<17)sizeof(char *));
131			break;
132			default:
133			fputs(progname, stderr);
134			fputs(": unsupported bits/pixel\n", stderr);
135			return 0;
136			}
137	greg	2.5	memset(&hashtab, 0, sizeof(hashtab));
138			hashtab.hashf = lu_shash;
139			hashtab.keycmp = strcmp;
140			hashtab.freek = free;
141	greg	2.1	if (!idmap \|\| !lu_init(&hashtab, idmlen))
142			goto memerr;
143			fputc('\n', stdout); /* end of info header */
144
145			rs.rt = PIXSTANDARD; /* get/write map resolution */
146			if (hdrflags & HF_RESOUT) {
147			if (!fgetsresolu(&rs, fp)) {
148			fputs(fname, stderr);
149			fputs(": bad resolution string\n", stderr);
150			return 0;
151			}
152			} else if (((rs.xr = xres) <= 0) \| ((rs.yr = yres) <= 0)) {
153			fputs(fname, stderr);
154			fputs(": missing/illegal resolution\n", stderr);
155			return 0;
156			}
157			fputsresolu(&rs, stdout);
158			/* read/assign/write each ID */
159			for (n = (long)rs.xr*rs.yr; n-- > 0; ) {
160			LUENT *lep;
161			char ident[MAXIDLEN];
162			int len = scan_ident(ident, fp);
163			if (len < 0) {
164			if (feof(fp)) {
165			fputs(fname, stderr);
166			fputs(": unexpected EOF\n", stderr);
167			}
168			return 0;
169			}
170			lep = lu_find(&hashtab, ident);
171			if (!lep->key) { /* new entry */
172			if (nextID >= 1<<(ndxbytes<<3)) {
173			fputs(progname, stderr);
174			fputs(
175			": too many unique identifiers for index size\n",
176			stderr);
177			return 0;
178			}
179			if (nextID >= idmlen) { /* reallocate? */
180			idmlen += idmlen>>2; /* +25% growth */
181			idmap = (char **)realloc(idmap, idmlen);
182			if (!idmap)
183			goto memerr;
184			}
185			lep->key = (char *)malloc(len+1);
186			if (!lep->key)
187			goto memerr;
188			idmap[nextID] = strcpy(lep->key, ident);
189			lep->data = (char *)nextID++;
190			}
191			/* write this id index */
192			putint((int)lep->data, ndxbytes, stdout);
193			}
194			while ((ndx = getc(fp)) != EOF) /* verify we got them all */
195			if (!isspace(ndx)) {
196			fputs(fname, stderr);
197			fputs(": warning - non-white characters past end\n",
198			stderr);
199			break;
200			}
201	greg	2.2	if (fp != stdin) /* done with input */
202			fclose(fp);
203	greg	2.1	for (ndx = 0; ndx < nextID; ndx++) { /* append string table */
204			fputs(idmap[ndx], stdout);
205			putchar('\0'); /* nul-terminated IDs */
206			}
207			free(idmap); /* clean up */
208			lu_done(&hashtab);
209			return 1;
210			memerr:
211			fputs(progname, stderr);
212			fputs(": out of memory!\n", stderr);
213			return 0;
214			}
215
216
217	greg	2.6	/* print out ID table */
218	greg	2.3	void
219			print_IDs(IDMAP *idmp)
220			{
221			int i;
222
223			printf("============ %d IDs ============\n", idmp->nids);
224
225	greg	2.7	for (i = 0; i < idmp->nids; i++) {
226			fputs(mapID(idmp, i), stdout);
227			putchar(sepc);
228			}
229			if (sepc != '\n')
230			fputc('\n', stdout);
231	greg	2.3	puts("============= END =============");
232			}
233
234
235	greg	2.1	/* Load selected pixels from identifier index file */
236			int
237			decode_select(const char *fname, int hdrflags)
238			{
239			IDMAP *idmp = idmap_ropen(fname, hdrflags);
240	greg	2.6	int i, j;
241	greg	2.1
242			if (!idmp)
243			return 0;
244
245	greg	2.3	if (hdrflags & HF_TABLOUT)
246			print_IDs(idmp);
247
248	greg	2.1	if (idmp->res.rt != PIXSTANDARD) {
249			fputs(progname, stderr);
250			fputs(": can only handle standard pixel ordering\n", stderr);
251			idmap_close(idmp);
252			return 0;
253			}
254	greg	2.6	while (scanf("%d %d", &i, &j) == 2) {
255			i = idmap_seek(idmp, i, idmp->res.yr-1 - j);
256			if (!i) {
257	greg	2.1	fputs(progname, stderr);
258			fputs(": warning - pixel index is off map\n", stderr);
259			continue;
260			}
261	greg	2.6	if (i > 0)
262			i = idmap_next_i(idmp);
263			if (i < 0) {
264	greg	2.3	fputs(fname, stderr);
265			fputs(": read/seek error in decode_select()\n", stderr);
266	greg	2.1	idmap_close(idmp);
267			return 0;
268			}
269	greg	2.3	if (numeric) {
270	greg	2.6	printf("%d", i);
271	greg	2.3	} else {
272	greg	2.6	const char *id = mapID(idmp, i);
273	greg	2.3	if (!id) {
274			fputs(fname, stderr);
275			fputs(": bad ID index in file\n", stderr);
276			idmap_close(idmp);
277			return 0;
278			}
279			fputs(id, stdout);
280			}
281	greg	2.1	putchar(sepc);
282			if (unbuffered && fflush(stdout) == EOF) {
283			fputs(progname, stderr);
284			fputs(": write error on output\n", stderr);
285			idmap_close(idmp);
286			return 0;
287			}
288			}
289			idmap_close(idmp);
290
291			if (!feof(stdin)) {
292			fputs(progname, stderr);
293			fputs(": non-numeric input for pixel index\n", stderr);
294			return 0;
295			}
296			return 1;
297			}
298
299
300			/* Load and convert identifier index file to ASCII */
301			int
302			decode_all(const char *fname, int hdrflags)
303			{
304			IDMAP *idmp = idmap_ropen(fname, hdrflags);
305			long n;
306
307			if (!idmp)
308			return 0;
309
310	greg	2.3	if (hdrflags & HF_TABLOUT)
311			print_IDs(idmp);
312
313	greg	2.1	for (n = idmp->res.xr*idmp->res.yr; n-- > 0; ) {
314	greg	2.6	const int ndx = idmap_next_i(idmp);
315	greg	2.3	if (ndx < 0) {
316	greg	2.1	fputs(fname, stderr);
317			fputs(": unexpected EOF\n", stderr);
318			idmap_close(idmp);
319			return 0;
320			}
321	greg	2.3	if (numeric) {
322			printf("%d", ndx);
323			} else {
324	greg	2.4	const char *id = mapID(idmp, ndx);
325	greg	2.3	if (!id) {
326			fputs(fname, stderr);
327			fputs(": bad ID index in file\n", stderr);
328			idmap_close(idmp);
329			return 0;
330			}
331			fputs(id, stdout);
332			}
333	greg	2.1	putchar(sepc);
334			}
335			idmap_close(idmp);
336			return 1;
337			}
338
339
340			int
341			main(int argc, char *argv[])
342			{
343			char *inpfname = NULL;
344			int reverse = 0;
345			int bypixel = 0;
346			int hdrflags = HF_HEADOUT\|HF_RESOUT;
347			int xres=0, yres=0;
348			int ndxbytes = 2;
349			int a;
350
351			progname = argv[0];
352			for (a = 1; a < argc && argv[a][0] == '-'; a++)
353			switch (argv[a][1]) {
354			case 'r':
355			reverse++;
356			break;
357			case 'i':
358			bypixel++;
359			break;
360			case 'u':
361			unbuffered++;
362			break;
363	greg	2.3	case 'n':
364			numeric++;
365			break;
366			case 'l':
367			hdrflags \|= HF_TABLOUT;
368			break;
369	greg	2.1	case 'h':
370			hdrflags &= ~HF_HEADOUT;
371			break;
372			case 'H':
373			hdrflags &= ~HF_RESOUT;
374			break;
375			case 't':
376			if (!(sepc = argv[a][2]))
377			sepc = '\n';
378			break;
379			case 'x':
380			xres = atoi(argv[++a]);
381			break;
382			case 'y':
383			yres = atoi(argv[++a]);
384			break;
385			case '8':
386			case '1':
387			case '2':
388			switch (atoi(argv[a]+1)) {
389			case 8:
390			ndxbytes = 1;
391			break;
392			case 16:
393			ndxbytes = 2;
394			break;
395			case 24:
396			ndxbytes = 3;
397			break;
398			default:
399			usage_exit(1);
400			}
401			break;
402			default:
403			usage_exit(1);
404			}
405	greg	2.2	if ((xres > 0) & (yres > 0)) /* user specified resolution? */
406			hdrflags &= ~HF_RESOUT;
407	greg	2.1	if (reverse && a >= argc) {
408			fputs(progname, stderr);
409			fputs(": -r option requires named input file\n", stderr);
410			return 1;
411			}
412			if (a < argc-2) {
413			fputs(progname, stderr);
414			fputs(": too many file arguments\n", stderr);
415			return 1;
416			}
417			if (a < argc)
418			inpfname = argv[a];
419			if (a+1 < argc && !freopen(argv[a+1], "w", stdout)) {
420			fputs(argv[a+1], stderr);
421			fputs(": cannot open output\n", stderr);
422			return 1;
423			}
424			if (!reverse)
425			SET_FILE_BINARY(stdout);
426			#ifdef getc_unlocked /* avoid stupid semaphores */
427			flockfile(stdout);
428			#endif
429			if (reverse) {
430			if (!(bypixel ? decode_select(inpfname, hdrflags) :
431			decode_all(inpfname, hdrflags)))
432			return 1;
433			} else if (!create_index(inpfname, hdrflags, ndxbytes, xres, yres))
434			return 1;
435
436			if (fflush(stdout) == EOF) {
437			fputs(progname, stderr);
438			fputs(": error writing output\n", stderr);
439			return 1;
440			}
441			return 0;
442			}